Merge branches 'for-next/misc', 'for-next/kselftest', 'for-next/efi-preempt', 'for-next/assembler-macro', 'for-next/typos', 'for-next/sme-ptrace-disable', 'for-next/local-tlbi-page-reused', 'for-next/mpam', 'for-next/acpi' and 'for-next/documentation', remote-tracking branch 'arm64/for-next/perf' into for-next/core

* arm64/for-next/perf:
perf: arm_spe: Add support for filtering on data source
perf: Add perf_event_attr::config4
perf/imx_ddr: Add support for PMU in DB (system interconnects)
perf/imx_ddr: Get and enable optional clks
perf/imx_ddr: Move ida_alloc() from ddr_perf_init() to ddr_perf_probe()
dt-bindings: perf: fsl-imx-ddr: Add compatible string for i.MX8QM, i.MX8QXP and i.MX8DXL
arch_topology: Provide a stub topology_core_has_smt() for !CONFIG_GENERIC_ARCH_TOPOLOGY
perf/arm-ni: Fix and optimise register offset calculation
perf: arm_pmuv3: Add new Cortex and C1 CPU PMUs
perf: arm_cspmu: fix error handling in arm_cspmu_impl_unregister()
perf/arm-ni: Add NoC S3 support
perf/arm_cspmu: nvidia: Add pmevfiltr2 support
perf/arm_cspmu: nvidia: Add revision id matching
perf/arm_cspmu: Add pmpidr support
perf/arm_cspmu: Add callback to reset filter config
perf: arm_pmuv3: Don't use PMCCNTR_EL0 on SMT cores

* for-next/misc:
: Miscellaneous patches
arm64: atomics: lse: Remove unused parameters from ATOMIC_FETCH_OP_AND macros
arm64: remove duplicate ARCH_HAS_MEM_ENCRYPT
arm64: mm: use untagged address to calculate page index
arm64: mm: make linear mapping permission update more robust for patial range
arm64/mm: Elide TLB flush in certain pte protection transitions
arm64/mm: Rename try_pgd_pgtable_alloc_init_mm
arm64/mm: Allow __create_pgd_mapping() to propagate pgtable_alloc() errors
arm64: add unlikely hint to MTE async fault check in el0_svc_common
arm64: acpi: add newline to deferred APEI warning
arm64: entry: Clean out some indirection
arm64/mm: Ensure PGD_SIZE is aligned to 64 bytes when PA_BITS = 52
arm64/mm: Drop cpu_set_[default|idmap]_tcr_t0sz()
arm64: remove unused ARCH_PFN_OFFSET
arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack
arm64: Remove assertion on CONFIG_VMAP_STACK

* for-next/kselftest:
: arm64 kselftest patches
kselftest/arm64: Align zt-test register dumps

* for-next/efi-preempt:
: arm64: Make EFI calls preemptible
arm64/efi: Call EFI runtime services without disabling preemption
arm64/efi: Move uaccess en/disable out of efi_set_pgd()
arm64/efi: Drop efi_rt_lock spinlock from EFI arch wrapper
arm64/fpsimd: Permit kernel mode NEON with IRQs off
arm64/fpsimd: Don't warn when EFI execution context is preemptible
efi/runtime-wrappers: Keep track of the efi_runtime_lock owner
efi: Add missing static initializer for efi_mm::cpus_allowed_lock

* for-next/assembler-macro:
: arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in headers
arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in uapi headers

* for-next/typos:
: Random typo/spelling fixes
arm64: Fix double word in comments
arm64: Fix typos and spelling errors in comments

* for-next/sme-ptrace-disable:
: Support disabling streaming mode via ptrace on SME only systems
kselftest/arm64: Cover disabling streaming mode without SVE in fp-ptrace
kselftst/arm64: Test NT_ARM_SVE FPSIMD format writes on non-SVE systems
arm64/sme: Support disabling streaming mode via ptrace on SME only systems

* for-next/local-tlbi-page-reused:
: arm64, mm: avoid TLBI broadcast if page reused in write fault
arm64, tlbflush: don't TLBI broadcast if page reused in write fault
mm: add spurious fault fixing support for huge pmd

* for-next/mpam: (34 commits)
: Basic Arm MPAM driver (more to follow)
MAINTAINERS: new entry for MPAM Driver
arm_mpam: Add kunit tests for props_mismatch()
arm_mpam: Add kunit test for bitmap reset
arm_mpam: Add helper to reset saved mbwu state
arm_mpam: Use long MBWU counters if supported
arm_mpam: Probe for long/lwd mbwu counters
arm_mpam: Consider overflow in bandwidth counter state
arm_mpam: Track bandwidth counter state for power management
arm_mpam: Add mpam_msmon_read() to read monitor value
arm_mpam: Add helpers to allocate monitors
arm_mpam: Probe and reset the rest of the features
arm_mpam: Allow configuration to be applied and restored during cpu online
arm_mpam: Use a static key to indicate when mpam is enabled
arm_mpam: Register and enable IRQs
arm_mpam: Extend reset logic to allow devices to be reset any time
arm_mpam: Add a helper to touch an MSC from any CPU
arm_mpam: Reset MSC controls from cpuhp callbacks
arm_mpam: Merge supported features during mpam_enable() into mpam_class
arm_mpam: Probe the hardware features resctrl supports
arm_mpam: Add helpers for managing the locking around the mon_sel registers
...

* for-next/acpi:
: arm64 acpi updates
ACPI: GTDT: Get rid of acpi_arch_timer_mem_init()

* for-next/documentation:
: arm64 Documentation updates
Documentation/arm64: Fix the typo of register names

Documentation/arch/arm64/booting.rst

···
     - SMCR_EL2.LEN must be initialised to the same value for all CPUs the
       kernel will execute on.
 
-    - HWFGRTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
+    - HFGRTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
 
-    - HWFGWTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
+    - HFGWTR_EL2.nTPIDR2_EL0 (bit 55) must be initialised to 0b01.
 
-    - HWFGRTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
+    - HFGRTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
 
-    - HWFGWTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
+    - HFGWTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
 
   For CPUs with the Scalable Matrix Extension FA64 feature (FEAT_SME_FA64):
 

Documentation/arch/arm64/sve.rst

···
   streaming mode and any SETREGSET of NT_ARM_SSVE will enter streaming mode
   if the target was not in streaming mode.
 
+* On systems that do not support SVE it is permitted to use SETREGSET to
+  write SVE_PT_REGS_FPSIMD formatted data via NT_ARM_SVE, in this case the
+  vector length should be specified as 0. This allows streaming mode to be
+  disabled on systems with SME but not SVE.
+
 * If any register data is provided along with SVE_PT_VL_ONEXEC then the
   registers data will be interpreted with the current vector length, not
   the vector length configured for use on exec.

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml
 F:	drivers/video/backlight/mp3309c.c
 
+MPAM DRIVER
+M:	James Morse <[e-mail]>
+M:	Ben Horgan <[e-mail]>
+R:	Reinette Chatre <[e-mail]>
+R:	Fenghua Yu <[e-mail]>
+S:	Maintained
+F:	drivers/resctrl/mpam_*
+F:	drivers/resctrl/test_mpam_*
+F:	include/linux/arm_mpam.h
+
 MPS MP2869 DRIVER
 M:	Wensheng Wang <[e-mail]>
 L:	[e-mail]

arch/arm64/Kconfig

···
 	select ARCH_HAS_SETUP_DMA_OPS
 	select ARCH_HAS_SET_DIRECT_MAP
 	select ARCH_HAS_SET_MEMORY
-	select ARCH_HAS_MEM_ENCRYPT
 	select ARCH_HAS_FORCE_DMA_UNENCRYPTED
 	select ARCH_STACKWALK
 	select ARCH_HAS_STRICT_KERNEL_RWX
···
 	help
 	  ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a
 	  range of input addresses.
+
+config ARM64_MPAM
+	bool "Enable support for MPAM"
+	select ARM64_MPAM_DRIVER if EXPERT	# does nothing yet
+	select ACPI_MPAM if ACPI
+	help
+	  Memory System Resource Partitioning and Monitoring (MPAM) is an
+	  optional extension to the Arm architecture that allows each
+	  transaction issued to the memory system to be labelled with a
+	  Partition identifier (PARTID) and Performance Monitoring Group
+	  identifier (PMG).
+
+	  Memory system components, such as the caches, can be configured with
+	  policies to control how much of various physical resources (such as
+	  memory bandwidth or cache memory) the transactions labelled with each
+	  PARTID can consume.  Depending on the capabilities of the hardware,
+	  the PARTID and PMG can also be used as filtering criteria to measure
+	  the memory system resource consumption of different parts of a
+	  workload.
+
+	  Use of this extension requires CPU support, support in the
+	  Memory System Components (MSC), and a description from firmware
+	  of where the MSCs are in the address space.
+
+	  MPAM is exposed to user-space via the resctrl pseudo filesystem.
 
 endmenu # "ARMv8.4 architectural features"
 

arch/arm64/include/asm/alternative-macros.h

···
 #error "cpucaps have overflown ARM64_CB_BIT"
 #endif
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/stringify.h>
 
···
 #define _ALTERNATIVE_CFG(insn1, insn2, cap, cfg, ...)	\
 	alternative_insn insn1, insn2, cap, IS_ENABLED(cfg)
 
-#endif  /*  __ASSEMBLY__  */
+#endif  /*  __ASSEMBLER__  */
 
 /*
  * Usage: asm(ALTERNATIVE(oldinstr, newinstr, cpucap));
···
 #define ALTERNATIVE(oldinstr, newinstr, ...)   \
 	_ALTERNATIVE_CFG(oldinstr, newinstr, __VA_ARGS__, 1)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/types.h>
 
···
 	return true;
 }
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_ALTERNATIVE_MACROS_H */

arch/arm64/include/asm/alternative.h

···
 
 #include <asm/alternative-macros.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/init.h>
 #include <linux/types.h>
···
 void alt_cb_patch_nops(struct alt_instr *alt, __le32 *origptr,
 		       __le32 *updptr, int nr_inst);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_ALTERNATIVE_H */

arch/arm64/include/asm/arch_gicv3.h

···
 
 #include <asm/sysreg.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/irqchip/arm-gic-common.h>
 #include <linux/stringify.h>
···
 	return cpus_have_cap(ARM64_HAS_GIC_PRIO_RELAXED_SYNC);
 }
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_ARCH_GICV3_H */

arch/arm64/include/asm/asm-extable.h

···
 /* Data fields for EX_TYPE_UACCESS_CPY */
 #define EX_DATA_UACCESS_WRITE	BIT(0)
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 #define __ASM_EXTABLE_RAW(insn, fixup, type, data)	\
 	.pushsection	__ex_table, "a";		\
···
 	__ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_UACCESS_CPY, \uaccess_is_write)
 	.endm
 
-#else /* __ASSEMBLY__ */
+#else /* __ASSEMBLER__ */
 
 #include <linux/stringify.h>
 
···
 			    EX_DATA_REG(ADDR, addr)				\
 			  ")")
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_ASM_EXTABLE_H */

arch/arm64/include/asm/assembler.h

···
  * Copyright (C) 1996-2000 Russell King
  * Copyright (C) 2012 ARM Ltd.
  */
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #error "Only include this from assembly code"
 #endif
 
···
  * [start, end) with dcache line size explicitly provided.
  *
  * 	op:		operation passed to dc instruction
- * 	domain:		domain used in dsb instruciton
+ * 	domain:		domain used in dsb instruction
  * 	start:          starting virtual address of the region
  * 	end:            end virtual address of the region
  *	linesz:		dcache line size
···
  * [start, end)
  *
  * 	op:		operation passed to dc instruction
- * 	domain:		domain used in dsb instruciton
+ * 	domain:		domain used in dsb instruction
  * 	start:          starting virtual address of the region
  * 	end:            end virtual address of the region
  * 	fixup:		optional label to branch to on user fault

arch/arm64/include/asm/atomic_lse.h

···
 	return __lse_atomic_andnot(~i, v);
 }
 
-#define ATOMIC_FETCH_OP_AND(name, mb, cl...)				\
+#define ATOMIC_FETCH_OP_AND(name)					\
 static __always_inline int						\
 __lse_atomic_fetch_and##name(int i, atomic_t *v)			\
 {									\
 	return __lse_atomic_fetch_andnot##name(~i, v);			\
 }
 
-ATOMIC_FETCH_OP_AND(_relaxed,   )
-ATOMIC_FETCH_OP_AND(_acquire,  a, "memory")
-ATOMIC_FETCH_OP_AND(_release,  l, "memory")
-ATOMIC_FETCH_OP_AND(        , al, "memory")
+ATOMIC_FETCH_OP_AND(_relaxed)
+ATOMIC_FETCH_OP_AND(_acquire)
+ATOMIC_FETCH_OP_AND(_release)
+ATOMIC_FETCH_OP_AND(        )
 
 #undef ATOMIC_FETCH_OP_AND
 
···
 	return __lse_atomic64_andnot(~i, v);
 }
 
-#define ATOMIC64_FETCH_OP_AND(name, mb, cl...)				\
+#define ATOMIC64_FETCH_OP_AND(name)					\
 static __always_inline long						\
 __lse_atomic64_fetch_and##name(s64 i, atomic64_t *v)			\
 {									\
 	return __lse_atomic64_fetch_andnot##name(~i, v);		\
 }
 
-ATOMIC64_FETCH_OP_AND(_relaxed,   )
-ATOMIC64_FETCH_OP_AND(_acquire,  a, "memory")
-ATOMIC64_FETCH_OP_AND(_release,  l, "memory")
-ATOMIC64_FETCH_OP_AND(        , al, "memory")
+ATOMIC64_FETCH_OP_AND(_relaxed)
+ATOMIC64_FETCH_OP_AND(_acquire)
+ATOMIC64_FETCH_OP_AND(_release)
+ATOMIC64_FETCH_OP_AND(        )
 
 #undef ATOMIC64_FETCH_OP_AND
 

arch/arm64/include/asm/barrier.h

···
 #ifndef __ASM_BARRIER_H
 #define __ASM_BARRIER_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/kasan-checks.h>
 
···
 
 #include <asm-generic/barrier.h>
 
-#endif	/* __ASSEMBLY__ */
+#endif	/* __ASSEMBLER__ */
 
 #endif	/* __ASM_BARRIER_H */

arch/arm64/include/asm/cache.h

···
 #define ARCH_DMA_MINALIGN	(128)
 #define ARCH_KMALLOC_MINALIGN	(8)
 
-#if !defined(__ASSEMBLY__) && !defined(BUILD_VDSO)
+#if !defined(__ASSEMBLER__) && !defined(BUILD_VDSO)
 
 #include <linux/bitops.h>
 #include <linux/kasan-enabled.h>
···
 	return ctr;
 }
 
-#endif /* !defined(__ASSEMBLY__) && !defined(BUILD_VDSO) */
+#endif /* !defined(__ASSEMBLER__) && !defined(BUILD_VDSO) */
 
 #endif

arch/arm64/include/asm/cpucaps.h

···
 
 #include <asm/cpucap-defs.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/types.h>
 /*
  * Check whether a cpucap is possible at compiletime.
···
 
 	return true;
 }
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_CPUCAPS_H */

arch/arm64/include/asm/cpufeature.h

···
 #define ARM64_SW_FEATURE_OVERRIDE_HVHE		4
 #define ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF	8
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/bug.h>
 #include <linux/jump_label.h>
···
  *    registers (e.g, SCTLR, TCR etc.) or patching the kernel via
  *    alternatives. The kernel patching is batched and performed at later
  *    point. The actions are always initiated only after the capability
- *    is finalised. This is usally denoted by "enabling" the capability.
+ *    is finalised. This is usually denoted by "enabling" the capability.
  *    The actions are initiated as follows :
  *	a) Action is triggered on all online CPUs, after the capability is
  *	finalised, invoked within the stop_machine() context from
···
 #define ARM64_CPUCAP_SCOPE_LOCAL_CPU		((u16)BIT(0))
 #define ARM64_CPUCAP_SCOPE_SYSTEM		((u16)BIT(1))
 /*
- * The capabilitiy is detected on the Boot CPU and is used by kernel
+ * The capability is detected on the Boot CPU and is used by kernel
  * during early boot. i.e, the capability should be "detected" and
  * "enabled" as early as possibly on all booting CPUs.
  */
···
 #endif
 }
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif

arch/arm64/include/asm/cputype.h

···
 #define MIDR_FUJITSU_ERRATUM_010001_MASK	(~MIDR_CPU_VAR_REV(1, 0))
 #define TCR_CLEAR_FUJITSU_ERRATUM_010001	(TCR_NFD1 | TCR_NFD0)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/sysreg.h>
 
···
 {
 	return read_cpuid(CTR_EL0);
 }
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif

arch/arm64/include/asm/current.h

···
 
 #include <linux/compiler.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct task_struct;
 
···
 
 #define current get_current()
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_CURRENT_H */
 

arch/arm64/include/asm/debug-monitors.h

···
 #define AARCH32_BREAK_THUMB2_LO	0xf7f0
 #define AARCH32_BREAK_THUMB2_HI	0xa000
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 struct task_struct;
 
 #define DBG_ARCH_ID_RESERVED	0	/* In case of ptrace ABI updates. */
···
 
 bool try_handle_aarch32_break(struct pt_regs *regs);
 
-#endif	/* __ASSEMBLY */
+#endif	/* __ASSEMBLER__ */
 #endif	/* __ASM_DEBUG_MONITORS_H */

arch/arm64/include/asm/efi.h

···
 		if (mm != current->active_mm) {
 			/*
 			 * Update the current thread's saved ttbr0 since it is
-			 * restored as part of a return from exception. Enable
-			 * access to the valid TTBR0_EL1 and invoke the errata
-			 * workaround directly since there is no return from
-			 * exception when invoking the EFI run-time services.
+			 * restored as part of a return from exception.
 			 */
 			update_saved_ttbr0(current, mm);
-			uaccess_ttbr0_enable();
-			post_ttbr_update_workaround();
 		} else {
 			/*
-			 * Defer the switch to the current thread's TTBR0_EL1
-			 * until uaccess_enable(). Restore the current
-			 * thread's saved ttbr0 corresponding to its active_mm
+			 * Restore the current thread's saved ttbr0
+			 * corresponding to its active_mm
 			 */
-			uaccess_ttbr0_disable();
 			update_saved_ttbr0(current, current->active_mm);
 		}
 	}

arch/arm64/include/asm/el2_setup.h

···
 #ifndef __ARM_KVM_INIT_H__
 #define __ARM_KVM_INIT_H__
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #error Assembly-only header
 #endif
 
···
 	 * Fruity CPUs seem to have HCR_EL2.E2H set to RAO/WI, but
 	 * don't advertise it (they predate this relaxation).
 	 *
-	 * Initalize HCR_EL2.E2H so that later code can rely upon HCR_EL2.E2H
+	 * Initialize HCR_EL2.E2H so that later code can rely upon HCR_EL2.E2H
 	 * indicating whether the CPU is running in E2H mode.
 	 */
 	mrs_s	x1, SYS_ID_AA64MMFR4_EL1

arch/arm64/include/asm/elf.h

···
 #define ELF_ET_DYN_BASE		(2 * DEFAULT_MAP_WINDOW_64 / 3)
 #endif /* CONFIG_ARM64_FORCE_52BIT */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <uapi/linux/elf.h>
 #include <linux/bug.h>
···
 	return 0;
 }
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif

arch/arm64/include/asm/esr.h

···
 #define ESR_ELx_IT_GCSPOPCX		6
 #define ESR_ELx_IT_GCSPOPX		7
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <asm/types.h>
 
 static inline unsigned long esr_brk_comment(unsigned long esr)
···
 }
 
 const char *esr_get_class_string(unsigned long esr);
-#endif /* __ASSEMBLY */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_ESR_H */

arch/arm64/include/asm/fixmap.h

···
 #ifndef _ASM_ARM64_FIXMAP_H
 #define _ASM_ARM64_FIXMAP_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/kernel.h>
 #include <linux/math.h>
 #include <linux/sizes.h>
···
 
 #include <asm-generic/fixmap.h>
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 #endif /* _ASM_ARM64_FIXMAP_H */

arch/arm64/include/asm/fpsimd.h

···
 #include <asm/sigcontext.h>
 #include <asm/sysreg.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/bitmap.h>
 #include <linux/build_bug.h>

arch/arm64/include/asm/ftrace.h

···
  */
 #define ARCH_FTRACE_SHIFT_STACK_TRACER 1
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/compat.h>
 
 extern void _mcount(unsigned long);
···
 	 */
 	return !strcmp(sym + 8, name);
 }
-#endif /* ifndef __ASSEMBLY__ */
+#endif /* ifndef __ASSEMBLER__ */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
 void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent,

arch/arm64/include/asm/gpr-num.h

···
 #ifndef __ASM_GPR_NUM_H
 #define __ASM_GPR_NUM_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
 	.equ	.L__gpr_num_x\num, \num
···
 	.equ	.L__gpr_num_xzr, 31
 	.equ	.L__gpr_num_wzr, 31
 
-#else /* __ASSEMBLY__ */
+#else /* __ASSEMBLER__ */
 
 #define __DEFINE_ASM_GPR_NUMS					\
 "	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n" \
···
 "	.equ	.L__gpr_num_xzr, 31\n"				\
 "	.equ	.L__gpr_num_wzr, 31\n"
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_GPR_NUM_H */

arch/arm64/include/asm/hwcap.h

···
 #define COMPAT_HWCAP2_SB	(1 << 5)
 #define COMPAT_HWCAP2_SSBS	(1 << 6)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/log2.h>
 
 /*

arch/arm64/include/asm/image.h

···
 #define ARM64_IMAGE_FLAG_PAGE_SIZE_64K		3
 #define ARM64_IMAGE_FLAG_PHYS_BASE		1
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #define arm64_image_flag_field(flags, field) \
 				(((flags) >> field##_SHIFT) & field##_MASK)
···
 	__le32 res5;
 };
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_IMAGE_H */

arch/arm64/include/asm/insn.h

···
 
 #include <asm/insn-def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 enum aarch64_insn_hint_cr_op {
 	AARCH64_INSN_HINT_NOP	= 0x0 << 5,
···
 typedef bool (pstate_check_t)(unsigned long);
 extern pstate_check_t * const aarch32_opcode_cond_checks[16];
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif	/* __ASM_INSN_H */

arch/arm64/include/asm/jump_label.h

···
 #ifndef __ASM_JUMP_LABEL_H
 #define __ASM_JUMP_LABEL_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/types.h>
 #include <asm/insn.h>
···
 	return true;
 }
 
-#endif  /* __ASSEMBLY__ */
+#endif  /* __ASSEMBLER__ */
 #endif	/* __ASM_JUMP_LABEL_H */

arch/arm64/include/asm/kasan.h

···
 #ifndef __ASM_KASAN_H
 #define __ASM_KASAN_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/linkage.h>
 #include <asm/memory.h>

arch/arm64/include/asm/kexec.h

···
 
 #define KEXEC_ARCH KEXEC_ARCH_AARCH64
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /**
  * crash_setup_regs() - save registers for the panic kernel
···
 		char *cmdline);
 #endif
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif

arch/arm64/include/asm/kgdb.h

···
 #include <linux/ptrace.h>
 #include <asm/debug-monitors.h>
 
-#ifndef	__ASSEMBLY__
+#ifndef	__ASSEMBLER__
 
 static inline void arch_kgdb_breakpoint(void)
 {
···
 }
 #endif
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 /*
  * gdb remote procotol (well most versions of it) expects the following

arch/arm64/include/asm/kvm_asm.h

···
 
 #define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init			0
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/mm.h>
 
···
 void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr, u64 elr_virt,
 	u64 elr_phys, u64 par, uintptr_t vcpu, u64 far, u64 hpfar);
 
-#else /* __ASSEMBLY__ */
+#else /* __ASSEMBLER__ */
 
 .macro get_host_ctxt reg, tmp
 	adr_this_cpu \reg, kvm_host_data, \tmp

arch/arm64/include/asm/kvm_mmu.h

···
  * mappings, and none of this applies in that case.
  */
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 #include <asm/alternative.h>
 
···
 static inline void kvm_s2_ptdump_create_debugfs(struct kvm *kvm) {}
 #endif /* CONFIG_PTDUMP_STAGE2_DEBUGFS */
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ARM64_KVM_MMU_H__ */

arch/arm64/include/asm/kvm_mte.h

···
 #ifndef __ASM_KVM_MTE_H
 #define __ASM_KVM_MTE_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 #include <asm/sysreg.h>
 
···
 .endm
 
 #endif /* CONFIG_ARM64_MTE */
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_KVM_MTE_H */

arch/arm64/include/asm/kvm_ptrauth.h

···
 #ifndef __ASM_KVM_PTRAUTH_H
 #define __ASM_KVM_PTRAUTH_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 #include <asm/sysreg.h>
 
···
 .endm
 #endif /* CONFIG_ARM64_PTR_AUTH */
 
-#else  /* !__ASSEMBLY */
+#else  /* !__ASSEMBLER__ */
 
 #define __ptrauth_save_key(ctxt, key)					\
 	do {								\
···
 		__ptrauth_save_key(ctxt, APGA);				\
 	} while(0)
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_KVM_PTRAUTH_H */

arch/arm64/include/asm/linkage.h

···
 #ifndef __ASM_LINKAGE_H
 #define __ASM_LINKAGE_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 #include <asm/assembler.h>
 #endif
 

arch/arm64/include/asm/memory.h

···
  */
 #define TRAMP_SWAPPER_OFFSET	(2 * PAGE_SIZE)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/bitops.h>
 #include <linux/compiler.h>
···
  *  virt_to_page(x)	convert a _valid_ virtual address to struct page *
  *  virt_addr_valid(x)	indicates whether a virtual address is valid
  */
-#define ARCH_PFN_OFFSET		((unsigned long)PHYS_PFN_OFFSET)
 
 #if defined(CONFIG_DEBUG_VIRTUAL)
 #define page_to_virt(x)	({						\
···
 })
 
 void dump_mem_limit(void);
-#endif /* !ASSEMBLY */
+#endif /* !__ASSEMBLER__ */
 
 /*
  * Given that the GIC architecture permits ITS implementations that can only be

arch/arm64/include/asm/mmu.h

···
 #define USER_ASID_FLAG	(UL(1) << USER_ASID_BIT)
 #define TTBR_ASID_MASK	(UL(0xffff) << 48)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/refcount.h>
 #include <asm/cpufeature.h>
···
 static inline void kpti_install_ng_mappings(void) {}
 #endif
 
-#endif	/* !__ASSEMBLY__ */
+#endif	/* !__ASSEMBLER__ */
 #endif

arch/arm64/include/asm/mmu_context.h

···
 #ifndef __ASM_MMU_CONTEXT_H
 #define __ASM_MMU_CONTEXT_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/compiler.h>
 #include <linux/sched.h>
···
 }
 
 /*
- * TCR.T0SZ value to use when the ID map is active.
- */
-#define idmap_t0sz	TCR_T0SZ(IDMAP_VA_BITS)
-
-/*
  * Ensure TCR.T0SZ is set to the provided value.
  */
 static inline void __cpu_set_tcr_t0sz(unsigned long t0sz)
···
 	write_sysreg(tcr, tcr_el1);
 	isb();
 }
-
-#define cpu_set_default_tcr_t0sz()	__cpu_set_tcr_t0sz(TCR_T0SZ(vabits_actual))
-#define cpu_set_idmap_tcr_t0sz()	__cpu_set_tcr_t0sz(idmap_t0sz)
 
 /*
  * Remove the idmap from TTBR0_EL1 and install the pgd of the active mm.
···
 
 	cpu_set_reserved_ttbr0();
 	local_flush_tlb_all();
-	cpu_set_default_tcr_t0sz();
+	__cpu_set_tcr_t0sz(TCR_T0SZ(vabits_actual));
 
 	if (mm != &init_mm && !system_uses_ttbr0_pan())
 		cpu_switch_mm(mm->pgd, mm);
···
 {
 	cpu_set_reserved_ttbr0();
 	local_flush_tlb_all();
-	cpu_set_idmap_tcr_t0sz();
+	__cpu_set_tcr_t0sz(TCR_T0SZ(IDMAP_VA_BITS));
 
 	cpu_switch_mm(lm_alias(idmap_pg_dir), &init_mm);
 }
···
 
 #include <asm-generic/mmu_context.h>
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* !__ASM_MMU_CONTEXT_H */

arch/arm64/include/asm/mte-kasan.h

···
 #include <asm/cputype.h>
 #include <asm/mte-def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/types.h>
 
···
 
 #endif /* CONFIG_ARM64_MTE */
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_MTE_KASAN_H  */

arch/arm64/include/asm/mte.h

···
 #include <asm/compiler.h>
 #include <asm/mte-def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/bitfield.h>
 #include <linux/kasan-enabled.h>
···
 }
 #endif /* CONFIG_KASAN_HW_TAGS */
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_MTE_H  */

arch/arm64/include/asm/page.h

···
 
 #include <asm/page-def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/personality.h> /* for READ_IMPLIES_EXEC */
 #include <linux/types.h> /* for gfp_t */
···
 
 #include <asm/memory.h>
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #define VM_DATA_DEFAULT_FLAGS	(VM_DATA_FLAGS_TSK_EXEC | VM_MTE_ALLOWED)
 

arch/arm64/include/asm/pgtable-prot.h

···
 #define _PAGE_READONLY_EXEC	(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN)
 #define _PAGE_EXECONLY		(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/cpufeature.h>
 #include <asm/pgtable-types.h>
···
 #define PAGE_READONLY_EXEC	__pgprot(_PAGE_READONLY_EXEC)
 #define PAGE_EXECONLY		__pgprot(_PAGE_EXECONLY)
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #define pte_pi_index(pte) ( \
 	((pte & BIT(PTE_PI_IDX_3)) >> (PTE_PI_IDX_3 - 3)) | \

arch/arm64/include/asm/pgtable.h

···
 
 #define vmemmap			((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/cmpxchg.h>
 #include <asm/fixmap.h>
···
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 /*
- * Outside of a few very special situations (e.g. hibernation), we always
- * use broadcast TLB invalidation instructions, therefore a spurious page
- * fault on one CPU which has been handled concurrently by another CPU
- * does not need to perform additional invalidation.
+ * We use local TLB invalidation instruction when reusing page in
+ * write protection fault handler to avoid TLBI broadcast in the hot
+ * path.  This will cause spurious page faults if stale read-only TLB
+ * entries exist.
  */
-#define flush_tlb_fix_spurious_fault(vma, address, ptep) do { } while (0)
+#define flush_tlb_fix_spurious_fault(vma, address, ptep)	\
+	local_flush_tlb_page_nonotify(vma, address)
+
+#define flush_tlb_fix_spurious_fault_pmd(vma, address, pmdp)	\
+	local_flush_tlb_page_nonotify(vma, address)
 
 /*
  * ZERO_PAGE is a global shared page that is always zero: used
···
  *   1      0      |   1           0          1
  *   1      1      |   0           1          x
  *
- * When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via
+ * When hardware DBM is not present, the software PTE_DIRTY bit is updated via
  * the page fault mechanism. Checking the dirty status of a pte becomes:
  *
  *   PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY)
···
 	/*
 	 * pte_present_invalid() tells us that the pte is invalid from HW
 	 * perspective but present from SW perspective, so the fields are to be
-	 * interpretted as per the HW layout. The second 2 checks are the unique
+	 * interpreted as per the HW layout. The second 2 checks are the unique
 	 * encoding that we use for PROT_NONE. It is insufficient to only use
 	 * the first check because we share the same encoding scheme with pmds
 	 * which support pmd_mkinvalid(), so can be present-invalid without
···
 
 #endif /* CONFIG_ARM64_CONTPTE */
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* __ASM_PGTABLE_H */

arch/arm64/include/asm/proc-fns.h

···
 #ifndef __ASM_PROCFNS_H
 #define __ASM_PROCFNS_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/page.h>
 
···
 
 #include <asm/memory.h>
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_PROCFNS_H */

arch/arm64/include/asm/processor.h

···
 
 #define MTE_CTRL_STORE_ONLY		(1UL << 19)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/build_bug.h>
 #include <linux/cache.h>
···
 #define GET_TSC_CTL(adr)        get_tsc_mode((adr))
 #define SET_TSC_CTL(val)        set_tsc_mode((val))
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* __ASM_PROCESSOR_H */

arch/arm64/include/asm/ptrace.h

···
  */
 #define NO_SYSCALL (-1)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/bug.h>
 #include <linux/types.h>
 
···
 
 extern unsigned long profile_pc(struct pt_regs *regs);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif

arch/arm64/include/asm/rsi_smc.h

···
  */
 #define SMC_RSI_ATTESTATION_TOKEN_CONTINUE	SMC_RSI_FID(0x195)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct realm_config {
 	union {
···
 	 */
 } __aligned(0x1000);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 /*
  * Read configuration for the current Realm.

arch/arm64/include/asm/rwonce.h

···
 #ifndef __ASM_RWONCE_H
 #define __ASM_RWONCE_H
 
-#if defined(CONFIG_LTO) && !defined(__ASSEMBLY__)
+#if defined(CONFIG_LTO) && !defined(__ASSEMBLER__)
 
 #include <linux/compiler_types.h>
 #include <asm/alternative-macros.h>
···
 })
 
 #endif	/* !BUILD_VDSO */
-#endif	/* CONFIG_LTO && !__ASSEMBLY__ */
+#endif	/* CONFIG_LTO && !__ASSEMBLER__ */
 
 #include <asm-generic/rwonce.h>
 

arch/arm64/include/asm/scs.h

···
 #ifndef _ASM_SCS_H
 #define _ASM_SCS_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 #include <asm/asm-offsets.h>
 #include <asm/sysreg.h>
···
 
 int __pi_scs_patch(const u8 eh_frame[], int size);
 
-#endif /* __ASSEMBLY __ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* _ASM_SCS_H */

arch/arm64/include/asm/sdei.h

···
 
 #define SDEI_STACK_SIZE		IRQ_STACK_SIZE
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/linkage.h>
 #include <linux/preempt.h>
···
 unsigned long sdei_arch_get_entry_point(int conduit);
 #define sdei_arch_get_entry_point(x)	sdei_arch_get_entry_point(x)
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif	/* __ASM_SDEI_H */

arch/arm64/include/asm/simd.h

···
 	 */
 	return !WARN_ON(!system_capabilities_finalized()) &&
 	       system_supports_fpsimd() &&
-	       !in_hardirq() && !irqs_disabled() && !in_nmi();
+	       !in_hardirq() && !in_nmi();
 }
 
 #else /* ! CONFIG_KERNEL_MODE_NEON */

arch/arm64/include/asm/smp.h

···
 #define CPU_STUCK_REASON_52_BIT_VA	(UL(1) << CPU_STUCK_REASON_SHIFT)
 #define CPU_STUCK_REASON_NO_GRAN	(UL(2) << CPU_STUCK_REASON_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/threads.h>
 #include <linux/cpumask.h>
···
 extern void crash_smp_send_stop(void);
 extern bool smp_crash_stop_failed(void);
 
-#endif /* ifndef __ASSEMBLY__ */
+#endif /* ifndef __ASSEMBLER__ */
 
 #endif /* ifndef __ASM_SMP_H */

arch/arm64/include/asm/spectre.h

···
 #define BP_HARDEN_EL2_SLOTS 4
 #define __BP_HARDEN_HYP_VECS_SZ	((BP_HARDEN_EL2_SLOTS - 1) * SZ_2K)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/smp.h>
 #include <asm/percpu.h>
 
···
 void spectre_bhb_patch_clearbhb(struct alt_instr *alt,
 				__le32 *origptr, __le32 *updptr, int nr_inst);
 
-#endif	/* __ASSEMBLY__ */
+#endif	/* __ASSEMBLER__ */
 #endif	/* __ASM_SPECTRE_H */

arch/arm64/include/asm/stacktrace/frame.h

···
 #define FRAME_META_TYPE_FINAL		1
 #define FRAME_META_TYPE_PT_REGS		2
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /* 
  * A standard AAPCS64 frame record.
  */
···
 	struct frame_record record;
 	u64 type;
 };
-#endif /* __ASSEMBLY */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_STACKTRACE_FRAME_H */

arch/arm64/include/asm/suspend.h

···
  * __cpu_suspend_enter()'s caller, and populated by __cpu_suspend_enter().
  * This data must survive until cpu_resume() is called.
  *
- * This struct desribes the size and the layout of the saved cpu state.
+ * This struct describes the size and the layout of the saved cpu state.
  * The layout of the callee_saved_regs is defined by the implementation
  * of __cpu_suspend_enter(), and cpu_resume(). This struct must be passed
  * in by the caller as __cpu_suspend_enter()'s stack-frame is gone once it

arch/arm64/include/asm/sysreg.h

···
 
 #ifndef CONFIG_BROKEN_GAS_INST
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 // The space separator is omitted so that __emit_inst(x) can be parsed as
 // either an assembler directive or an assembler macro argument.
 #define __emit_inst(x)			.inst(x)
···
 					 (((x) >> 24) & 0x000000ff))
 #endif	/* CONFIG_CPU_BIG_ENDIAN */
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 #define __emit_inst(x)			.long __INSTR_BSWAP(x)
-#else  /* __ASSEMBLY__ */
+#else  /* __ASSEMBLER__ */
 #define __emit_inst(x)			".long " __stringify(__INSTR_BSWAP(x)) "\n\t"
-#endif	/* __ASSEMBLY__ */
+#endif	/* __ASSEMBLER__ */
 
 #endif	/* CONFIG_BROKEN_GAS_INST */
 
···
 
 #define ARM64_FEATURE_FIELD_BITS	4
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 	.macro	mrs_s, rt, sreg
 	 __emit_inst(0xd5200000|(\sreg)|(.L__gpr_num_\rt))

arch/arm64/include/asm/system_misc.h

···
 #ifndef __ASM_SYSTEM_MISC_H
 #define __ASM_SYSTEM_MISC_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/compiler.h>
 #include <linux/linkage.h>
···
 struct mm_struct;
 extern void __show_regs(struct pt_regs *);
 
-#endif	/* __ASSEMBLY__ */
+#endif	/* __ASSEMBLER__ */
 
 #endif	/* __ASM_SYSTEM_MISC_H */

arch/arm64/include/asm/thread_info.h

···
 
 #include <linux/compiler.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct task_struct;
 

arch/arm64/include/asm/tlbflush.h

···
 #ifndef __ASM_TLBFLUSH_H
 #define __ASM_TLBFLUSH_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/bitfield.h>
 #include <linux/mm_types.h>
···
  *		cannot be easily determined, the value TLBI_TTL_UNKNOWN will
  *		perform a non-hinted invalidation.
  *
+ *	local_flush_tlb_page(vma, addr)
+ *		Local variant of flush_tlb_page().  Stale TLB entries may
+ *		remain in remote CPUs.
+ *
+ *	local_flush_tlb_page_nonotify(vma, addr)
+ *		Same as local_flush_tlb_page() except MMU notifier will not be
+ *		called.
+ *
+ *	local_flush_tlb_contpte(vma, addr)
+ *		Invalidate the virtual-address range
+ *		'[addr, addr+CONT_PTE_SIZE)' mapped with contpte on local CPU
+ *		for the user address space corresponding to 'vma->mm'.  Stale
+ *		TLB entries may remain in remote CPUs.
  *
  *	Finally, take a look at asm/tlb.h to see how tlb_flush() is implemented
  *	on top of these routines, since that is our interface to the mmu_gather
···
 	__tlbi_user(aside1is, asid);
 	dsb(ish);
 	mmu_notifier_arch_invalidate_secondary_tlbs(mm, 0, -1UL);
+}
+
+static inline void __local_flush_tlb_page_nonotify_nosync(struct mm_struct *mm,
+							  unsigned long uaddr)
+{
+	unsigned long addr;
+
+	dsb(nshst);
+	addr = __TLBI_VADDR(uaddr, ASID(mm));
+	__tlbi(vale1, addr);
+	__tlbi_user(vale1, addr);
+}
+
+static inline void local_flush_tlb_page_nonotify(struct vm_area_struct *vma,
+						 unsigned long uaddr)
+{
+	__local_flush_tlb_page_nonotify_nosync(vma->vm_mm, uaddr);
+	dsb(nsh);
+}
+
+static inline void local_flush_tlb_page(struct vm_area_struct *vma,
+					unsigned long uaddr)
+{
+	__local_flush_tlb_page_nonotify_nosync(vma->vm_mm, uaddr);
+	mmu_notifier_arch_invalidate_secondary_tlbs(vma->vm_mm, uaddr & PAGE_MASK,
+						(uaddr & PAGE_MASK) + PAGE_SIZE);
+	dsb(nsh);
 }
 
 static inline void __flush_tlb_page_nosync(struct mm_struct *mm,
···
 	dsb(ish);
 }
 
+static inline void local_flush_tlb_contpte(struct vm_area_struct *vma,
+					   unsigned long addr)
+{
+	unsigned long asid;
+
+	addr = round_down(addr, CONT_PTE_SIZE);
+
+	dsb(nshst);
+	asid = ASID(vma->vm_mm);
+	__flush_tlb_range_op(vale1, addr, CONT_PTES, PAGE_SIZE, asid,
+			     3, true, lpa2_is_enabled());
+	mmu_notifier_arch_invalidate_secondary_tlbs(vma->vm_mm, addr,
+						    addr + CONT_PTE_SIZE);
+	dsb(nsh);
+}
+
 static inline void flush_tlb_range(struct vm_area_struct *vma,
 				   unsigned long start, unsigned long end)
 {
···
 {
 	__flush_tlb_range_nosync(mm, start, end, PAGE_SIZE, true, 3);
 }
+
+static inline bool __pte_flags_need_flush(ptdesc_t oldval, ptdesc_t newval)
+{
+	ptdesc_t diff = oldval ^ newval;
+
+	/* invalid to valid transition requires no flush */
+	if (!(oldval & PTE_VALID))
+		return false;
+
+	/* Transition in the SW bits requires no flush */
+	diff &= ~PTE_SWBITS_MASK;
+
+	return diff;
+}
+
+static inline bool pte_needs_flush(pte_t oldpte, pte_t newpte)
+{
+	return __pte_flags_need_flush(pte_val(oldpte), pte_val(newpte));
+}
+#define pte_needs_flush pte_needs_flush
+
+static inline bool huge_pmd_needs_flush(pmd_t oldpmd, pmd_t newpmd)
+{
+	return __pte_flags_need_flush(pmd_val(oldpmd), pmd_val(newpmd));
+}
+#define huge_pmd_needs_flush huge_pmd_needs_flush
+
 #endif
 
 #endif

arch/arm64/include/asm/vdso.h

···
 
 #define __VDSO_PAGES    4
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <generated/vdso-offsets.h>
 
···
 extern char vdso_start[], vdso_end[];
 extern char vdso32_start[], vdso32_end[];
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* __ASM_VDSO_H */

arch/arm64/include/asm/vdso/compat_barrier.h

···
 #ifndef __COMPAT_BARRIER_H
 #define __COMPAT_BARRIER_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /*
  * Warning: This code is meant to be used from the compat vDSO only.
  */
···
 #define smp_rmb()	aarch32_smp_rmb()
 #define smp_wmb()	aarch32_smp_wmb()
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* __COMPAT_BARRIER_H */

arch/arm64/include/asm/vdso/compat_gettimeofday.h

···
 #ifndef __ASM_VDSO_COMPAT_GETTIMEOFDAY_H
 #define __ASM_VDSO_COMPAT_GETTIMEOFDAY_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/barrier.h>
 #include <asm/unistd_compat_32.h>
···
 }
 #define vdso_clocksource_ok	vdso_clocksource_ok
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* __ASM_VDSO_COMPAT_GETTIMEOFDAY_H */

arch/arm64/include/asm/vdso/getrandom.h

···
 #ifndef __ASM_VDSO_GETRANDOM_H
 #define __ASM_VDSO_GETRANDOM_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/unistd.h>
 #include <asm/vdso/vsyscall.h>
···
 	return ret;
 }
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* __ASM_VDSO_GETRANDOM_H */

arch/arm64/include/asm/vdso/gettimeofday.h

···
 
 #ifdef __aarch64__
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/alternative.h>
 #include <asm/arch_timer.h>
···
 #define __arch_get_vdso_u_time_data __arch_get_vdso_u_time_data
 #endif /* IS_ENABLED(CONFIG_CC_IS_GCC) && IS_ENABLED(CONFIG_PAGE_SIZE_64KB) */
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #else /* !__aarch64__ */
 

arch/arm64/include/asm/vdso/processor.h

···
 #ifndef __ASM_VDSO_PROCESSOR_H
 #define __ASM_VDSO_PROCESSOR_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 static inline void cpu_relax(void)
 {
 	asm volatile("yield" ::: "memory");
 }
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_VDSO_PROCESSOR_H */

arch/arm64/include/asm/vdso/vsyscall.h

···
 #ifndef __ASM_VDSO_VSYSCALL_H
 #define __ASM_VDSO_VSYSCALL_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <vdso/datapage.h>
 
···
 /* The asm-generic header needs to be included after the definitions above */
 #include <asm-generic/vdso/vsyscall.h>
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #endif /* __ASM_VDSO_VSYSCALL_H */

arch/arm64/include/asm/virt.h

···
  */
 #define BOOT_CPU_FLAG_E2H	BIT_ULL(32)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/ptrace.h>
 #include <asm/sections.h>
···
 	return is_hyp_mode_available() && !is_kernel_in_hyp_mode();
 }
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* ! __ASM__VIRT_H */

arch/arm64/include/asm/vmap_stack.h

···
 #ifndef __ASM_VMAP_STACK_H
 #define __ASM_VMAP_STACK_H
 
-#include <linux/bug.h>
 #include <linux/gfp.h>
-#include <linux/kconfig.h>
 #include <linux/vmalloc.h>
 #include <linux/pgtable.h>
 #include <asm/memory.h>
···
 static inline unsigned long *arch_alloc_vmap_stack(size_t stack_size, int node)
 {
 	void *p;
-
-	BUILD_BUG_ON(!IS_ENABLED(CONFIG_VMAP_STACK));
 
 	p = __vmalloc_node(stack_size, THREAD_ALIGN, THREADINFO_GFP, node,
 			__builtin_return_address(0));

arch/arm64/include/uapi/asm/kvm.h

···
 #define KVM_SPSR_FIQ	4
 #define KVM_NR_SPSR	5
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/psci.h>
 #include <linux/types.h>
 #include <asm/ptrace.h>

arch/arm64/include/uapi/asm/ptrace.h

···
 #define PTRACE_PEEKMTETAGS	  33
 #define PTRACE_POKEMTETAGS	  34
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /*
  * User structures for general purpose, floating point and debug registers.
···
 	__u64 gcspr_el0;
 };
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* _UAPI__ASM_PTRACE_H */

arch/arm64/include/uapi/asm/sigcontext.h

···
 #ifndef _UAPI__ASM_SIGCONTEXT_H
 #define _UAPI__ASM_SIGCONTEXT_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <linux/types.h>
 
···
 	__u64 reserved;
 };
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 #include <asm/sve_context.h>
 

arch/arm64/kernel/acpi.c

···
 
 	/*
 	 * FADT is required on arm64; retrieve it to check its presence
-	 * and carry out revision and ACPI HW reduced compliancy tests
+	 * and carry out revision and ACPI HW reduced compliance tests
 	 */
 	status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
 	if (ACPI_FAILURE(status)) {
···
 			irq_work_run();
 			__irq_exit();
 		} else {
-			pr_warn_ratelimited("APEI work queued but not completed");
+			pr_warn_ratelimited("APEI work queued but not completed\n");
 			err = -EINPROGRESS;
 		}
 	}

arch/arm64/kernel/cpufeature.c

···
 
 /*
  * Initialise the CPU feature register from Boot CPU values.
- * Also initiliases the strict_mask for the register.
+ * Also initialises the strict_mask for the register.
  * Any bits that are not covered by an arm64_ftr_bits entry are considered
  * RES0 for the system-wide value, and must strictly match.
  */

arch/arm64/kernel/efi.c

···
 #include <linux/efi.h>
 #include <linux/init.h>
 #include <linux/kmemleak.h>
+#include <linux/kthread.h>
 #include <linux/screen_info.h>
 #include <linux/vmalloc.h>
 
···
 	return s;
 }
 
-static DEFINE_RAW_SPINLOCK(efi_rt_lock);
-
 void arch_efi_call_virt_setup(void)
 {
-	efi_virtmap_load();
-	raw_spin_lock(&efi_rt_lock);
+	efi_runtime_assert_lock_held();
+
+	if (preemptible() && (current->flags & PF_KTHREAD)) {
+		/*
+		 * Disable migration to ensure that a preempted EFI runtime
+		 * service call will be resumed on the same CPU. This avoids
+		 * potential issues with EFI runtime calls that are preempted
+		 * while polling for an asynchronous completion of a secure
+		 * firmware call, which may not permit the CPU to change.
+		 */
+		migrate_disable();
+		kthread_use_mm(&efi_mm);
+	} else {
+		efi_virtmap_load();
+	}
+
+	/*
+	 * Enable access to the valid TTBR0_EL1 and invoke the errata
+	 * workaround directly since there is no return from exception when
+	 * invoking the EFI run-time services.
+	 */
+	uaccess_ttbr0_enable();
+	post_ttbr_update_workaround();
+
 	__efi_fpsimd_begin();
 }
 
 void arch_efi_call_virt_teardown(void)
 {
 	__efi_fpsimd_end();
-	raw_spin_unlock(&efi_rt_lock);
-	efi_virtmap_unload();
+
+	/*
+	 * Defer the switch to the current thread's TTBR0_EL1 until
+	 * uaccess_enable(). Do so before efi_virtmap_unload() updates the
+	 * saved TTBR0 value, so the userland page tables are not activated
+	 * inadvertently over the back of an exception.
+	 */
+	uaccess_ttbr0_disable();
+
+	if (preemptible() && (current->flags & PF_KTHREAD)) {
+		kthread_unuse_mm(&efi_mm);
+		migrate_enable();
+	} else {
+		efi_virtmap_unload();
+	}
 }
 
 asmlinkage u64 *efi_rt_stack_top __ro_after_init;

arch/arm64/kernel/entry-common.c

···
  * Handle IRQ/context state management when entering from kernel mode.
  * Before this function is called it is not safe to call regular kernel code,
  * instrumentable code, or any code which may trigger an exception.
- *
- * This is intended to match the logic in irqentry_enter(), handling the kernel
- * mode transitions only.
  */
-static __always_inline irqentry_state_t __enter_from_kernel_mode(struct pt_regs *regs)
-{
-	return irqentry_enter(regs);
-}
-
 static noinstr irqentry_state_t enter_from_kernel_mode(struct pt_regs *regs)
 {
 	irqentry_state_t state;
 
-	state = __enter_from_kernel_mode(regs);
+	state = irqentry_enter(regs);
 	mte_check_tfsr_entry();
 	mte_disable_tco_entry(current);
 
···
  * Handle IRQ/context state management when exiting to kernel mode.
  * After this function returns it is not safe to call regular kernel code,
  * instrumentable code, or any code which may trigger an exception.
- *
- * This is intended to match the logic in irqentry_exit(), handling the kernel
- * mode transitions only, and with preemption handled elsewhere.
  */
-static __always_inline void __exit_to_kernel_mode(struct pt_regs *regs,
-						  irqentry_state_t state)
-{
-	irqentry_exit(regs, state);
-}
-
 static void noinstr exit_to_kernel_mode(struct pt_regs *regs,
 					irqentry_state_t state)
 {
 	mte_check_tfsr_exit();
-	__exit_to_kernel_mode(regs, state);
+	irqentry_exit(regs, state);
 }
 
 /*
···
  * Before this function is called it is not safe to call regular kernel code,
  * instrumentable code, or any code which may trigger an exception.
  */
-static __always_inline void __enter_from_user_mode(struct pt_regs *regs)
+static __always_inline void arm64_enter_from_user_mode(struct pt_regs *regs)
 {
 	enter_from_user_mode(regs);
 	mte_disable_tco_entry(current);
-}
-
-static __always_inline void arm64_enter_from_user_mode(struct pt_regs *regs)
-{
-	__enter_from_user_mode(regs);
 }
 
 /*

arch/arm64/kernel/entry-ftrace.S

···
 	stp	x29, x30, [sp, #FREGS_SIZE]
 	add	x29, sp, #FREGS_SIZE
 
-	/* Prepare arguments for the the tracer func */
+	/* Prepare arguments for the tracer func */
 	sub	x0, x30, #AARCH64_INSN_SIZE		// ip (callsite's BL insn)
 	mov	x1, x9					// parent_ip (callsite's LR)
 	mov	x3, sp					// regs

arch/arm64/kernel/fpsimd.c

···
  */
 static void get_cpu_fpsimd_context(void)
 {
-	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
-		local_bh_disable();
-	else
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
+		/*
+		 * The softirq subsystem lacks a true unmask/mask API, and
+		 * re-enabling softirq processing using local_bh_enable() will
+		 * not only unmask softirqs, it will also result in immediate
+		 * delivery of any pending softirqs.
+		 * This is undesirable when running with IRQs disabled, but in
+		 * that case, there is no need to mask softirqs in the first
+		 * place, so only bother doing so when IRQs are enabled.
+		 */
+		if (!irqs_disabled())
+			local_bh_disable();
+	} else {
 		preempt_disable();
+	}
 }
 
 /*
···
  */
 static void put_cpu_fpsimd_context(void)
 {
-	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
-		local_bh_enable();
-	else
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
+		if (!irqs_disabled())
+			local_bh_enable();
+	} else {
 		preempt_enable();
+	}
 }
 
 unsigned int task_get_vl(const struct task_struct *task, enum vec_type type)
···
 	if (!system_supports_fpsimd())
 		return;
 
-	WARN_ON(preemptible());
-
 	if (may_use_simd()) {
 		kernel_neon_begin();
 	} else {
+		WARN_ON(preemptible());
+
 		/*
 		 * If !efi_sve_state, SVE can't be in use yet and doesn't need
 		 * preserving:

arch/arm64/kernel/ftrace.c

···
 		return ret;
 
 	/*
-	 * When using mcount, callsites in modules may have been initalized to
+	 * When using mcount, callsites in modules may have been initialized to
 	 * call an arbitrary module PLT (which redirects to the _mcount stub)
 	 * rather than the ftrace PLT we'll use at runtime (which redirects to
 	 * the ftrace trampoline). We can ignore the old PLT when initializing

arch/arm64/kernel/irq.c

···
 	}
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 static void ____do_softirq(struct pt_regs *regs)
 {
 	__do_softirq();

arch/arm64/kernel/machine_kexec.c

···
  * marked as Reserved as memory was allocated via memblock_reserve().
  *
  * In hibernation, the pages which are Reserved and yet "nosave" are excluded
- * from the hibernation iamge. crash_is_nosave() does thich check for crash
+ * from the hibernation image. crash_is_nosave() does thich check for crash
  * dump kernel and will reduce the total size of hibernation image.
  */
 

arch/arm64/kernel/probes/uprobes.c

···
 	struct uprobe_task *utask = current->utask;
 
 	/*
-	 * Task has received a fatal signal, so reset back to probbed
+	 * Task has received a fatal signal, so reset back to probed
 	 * address.
 	 */
 	instruction_pointer_set(regs, utask->vaddr);

arch/arm64/kernel/ptrace.c

···
 		return -EINVAL;
 
 	/*
-	 * Apart from SVE_PT_REGS_MASK, all SVE_PT_* flags are consumed by
-	 * vec_set_vector_length(), which will also validate them for us:
+	 * On systems without SVE we accept FPSIMD format writes with
+	 * a VL of 0 to allow exiting streaming mode, otherwise a VL
+	 * is required.
 	 */
-	ret = vec_set_vector_length(target, type, header.vl,
-		((unsigned long)header.flags & ~SVE_PT_REGS_MASK) << 16);
-	if (ret)
-		return ret;
+	if (header.vl) {
+		/*
+		 * If the system does not support SVE we can't
+		 * configure a SVE VL.
+		 */
+		if (!system_supports_sve() && type == ARM64_VEC_SVE)
+			return -EINVAL;
+
+		/*
+		 * Apart from SVE_PT_REGS_MASK, all SVE_PT_* flags are
+		 * consumed by vec_set_vector_length(), which will
+		 * also validate them for us:
+		 */
+		ret = vec_set_vector_length(target, type, header.vl,
+					    ((unsigned long)header.flags & ~SVE_PT_REGS_MASK) << 16);
+		if (ret)
+			return ret;
+	} else {
+		/* If the system supports SVE we require a VL. */
+		if (system_supports_sve())
+			return -EINVAL;
+
+		/*
+		 * Only FPSIMD formatted data with no flags set is
+		 * supported.
+		 */
+		if (header.flags != SVE_PT_REGS_FPSIMD)
+			return -EINVAL;
+	}
 
 	/* Allocate SME storage if necessary, preserving any existing ZA/ZT state */
 	if (type == ARM64_VEC_SME) {
···
 		   unsigned int pos, unsigned int count,
 		   const void *kbuf, const void __user *ubuf)
 {
-	if (!system_supports_sve())
+	if (!system_supports_sve() && !system_supports_sme())
 		return -EINVAL;
 
 	return sve_set_common(target, regset, pos, count, kbuf, ubuf,

arch/arm64/kernel/sdei.c

···
 {
 	int cpu;
 
-	BUILD_BUG_ON(!IS_ENABLED(CONFIG_VMAP_STACK));
-
 	for_each_possible_cpu(cpu) {
 		_free_sdei_stack(&sdei_stack_normal_ptr, cpu);
 		_free_sdei_stack(&sdei_stack_critical_ptr, cpu);
···
 {
 	int cpu;
 	int err = 0;
-
-	BUILD_BUG_ON(!IS_ENABLED(CONFIG_VMAP_STACK));
 
 	for_each_possible_cpu(cpu) {
 		err = _init_sdei_stack(&sdei_stack_normal_ptr, cpu);
···
 /*
  * do_sdei_event() returns one of:
  *  SDEI_EV_HANDLED -  success, return to the interrupted context.
- *  SDEI_EV_FAILED  -  failure, return this error code to firmare.
+ *  SDEI_EV_FAILED  -  failure, return this error code to firmware.
  *  virtual-address -  success, return to this address.
  */
 unsigned long __kprobes do_sdei_event(struct pt_regs *regs,

arch/arm64/kernel/smp.c

···
 
 	/*
 	 * Now that the dying CPU is beyond the point of no return w.r.t.
-	 * in-kernel synchronisation, try to get the firwmare to help us to
+	 * in-kernel synchronisation, try to get the firmware to help us to
 	 * verify that it has really left the kernel before we consider
 	 * clobbering anything it might still be using.
 	 */
···
 
 	/*
 	 * Availability of the acpi handle is sufficient to establish
-	 * that _STA has aleady been checked. No need to recheck here.
+	 * that _STA has already been checked. No need to recheck here.
 	 */
 	c->hotpluggable = arch_cpu_is_hotpluggable(cpu);
 

arch/arm64/kernel/syscall.c

···
 	 * (Similarly for HVC and SMC elsewhere.)
 	 */
 
-	if (flags & _TIF_MTE_ASYNC_FAULT) {
+	if (unlikely(flags & _TIF_MTE_ASYNC_FAULT)) {
 		/*
 		 * Process the asynchronous tag check fault before the actual
 		 * syscall. do_notify_resume() will send a signal to userspace

arch/arm64/kernel/traps.c

···
 	__show_regs(regs);
 
 	/*
-	 * We use nmi_panic to limit the potential for recusive overflows, and
+	 * We use nmi_panic to limit the potential for recursive overflows, and
 	 * to get a better stack trace.
 	 */
 	nmi_panic(NULL, "kernel stack overflow");

arch/arm64/kvm/arch_timer.c

···
 		tpt = tpc = true;
 
 	/*
-	 * For the poor sods that could not correctly substract one value
+	 * For the poor sods that could not correctly subtract one value
 	 * from another, trap the full virtual timer and counter.
 	 */
 	if (has_broken_cntvoff() && timer_get_offset(map->direct_vtimer))

arch/arm64/kvm/arm.c

···
 	kvm_nvhe_sym(__icache_flags) = __icache_flags;
 	kvm_nvhe_sym(kvm_arm_vmid_bits) = kvm_arm_vmid_bits;
 
-	/* Propagate the FGT state to the the nVHE side */
+	/* Propagate the FGT state to the nVHE side */
 	kvm_nvhe_sym(hfgrtr_masks)  = hfgrtr_masks;
 	kvm_nvhe_sym(hfgwtr_masks)  = hfgwtr_masks;
 	kvm_nvhe_sym(hfgitr_masks)  = hfgitr_masks;

arch/arm64/kvm/hyp/nvhe/ffa.c

···
 	 *
 	 * FFA-1.3 introduces 64-bit variants of the CPU cycle management
 	 * interfaces. Moreover, FF-A 1.3 clarifies that SMC32 direct requests
-	 * complete with SMC32 direct reponses which *should* allow us use the
+	 * complete with SMC32 direct responses which *should* allow us use the
 	 * function ID sent by the caller to determine whether to return x8-x17.
 	 *
 	 * Note that we also cannot rely on function IDs in the response.

arch/arm64/kvm/mmu.c

···
 
 	/*
 	 * Check if this is non-struct page memory PFN, and cannot support
-	 * CMOs. It could potentially be unsafe to access as cachable.
+	 * CMOs. It could potentially be unsafe to access as cacheable.
 	 */
 	if (vm_flags & (VM_PFNMAP | VM_MIXEDMAP) && !pfn_is_map_memory(pfn)) {
 		if (is_vma_cacheable) {

arch/arm64/kvm/nested.c

···
 	/*
 	 * Let's treat memory allocation failures as benign: If we fail to
 	 * allocate anything, return an error and keep the allocated array
-	 * alive. Userspace may try to recover by intializing the vcpu
+	 * alive. Userspace may try to recover by initializing the vcpu
 	 * again, and there is no reason to affect the whole VM for this.
 	 */
 	num_mmus = atomic_read(&kvm->online_vcpus) * S2_MMU_PER_VCPU;

arch/arm64/mm/contpte.c

···
 			__ptep_set_access_flags(vma, addr, ptep, entry, 0);
 
 		if (dirty)
-			__flush_tlb_range(vma, start_addr, addr,
-							PAGE_SIZE, true, 3);
+			local_flush_tlb_contpte(vma, start_addr);
 	} else {
 		__contpte_try_unfold(vma->vm_mm, addr, ptep, orig_pte);
 		__ptep_set_access_flags(vma, addr, ptep, entry, dirty);

arch/arm64/mm/fault.c

···
 		pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval);
 	} while (pteval != old_pteval);
 
-	/* Invalidate a stale read-only entry */
+	/*
+	 * Invalidate the local stale read-only entry.  Remote stale entries
+	 * may still cause page faults and be invalidated via
+	 * flush_tlb_fix_spurious_fault().
+	 */
 	if (dirty)
-		flush_tlb_page(vma, address);
+		local_flush_tlb_page(vma, address);
 	return 1;
 }
 

arch/arm64/mm/mmu.c

···
 #define NO_CONT_MAPPINGS	BIT(1)
 #define NO_EXEC_MAPPINGS	BIT(2)	/* assumes FEAT_HPDS is not used */
 
+#define INVALID_PHYS_ADDR	(-1ULL)
+
 DEFINE_STATIC_KEY_FALSE(arm64_ptdump_lock_key);
 
 u64 kimage_voffset __ro_after_init;
···
 	} while (ptep++, addr += PAGE_SIZE, addr != end);
 }
 
-static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
-				unsigned long end, phys_addr_t phys,
-				pgprot_t prot,
-				phys_addr_t (*pgtable_alloc)(enum pgtable_type),
-				int flags)
+static int alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
+			       unsigned long end, phys_addr_t phys,
+			       pgprot_t prot,
+			       phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			       int flags)
 {
 	unsigned long next;
 	pmd_t pmd = READ_ONCE(*pmdp);
···
 			pmdval |= PMD_TABLE_PXN;
 		BUG_ON(!pgtable_alloc);
 		pte_phys = pgtable_alloc(TABLE_PTE);
+		if (pte_phys == INVALID_PHYS_ADDR)
+			return -ENOMEM;
 		ptep = pte_set_fixmap(pte_phys);
 		init_clear_pgtable(ptep);
 		ptep += pte_index(addr);
···
 	 * walker.
 	 */
 	pte_clear_fixmap();
+
+	return 0;
 }
 
-static void init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
-		     phys_addr_t phys, pgprot_t prot,
-		     phys_addr_t (*pgtable_alloc)(enum pgtable_type), int flags)
+static int init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
+		    phys_addr_t phys, pgprot_t prot,
+		    phys_addr_t (*pgtable_alloc)(enum pgtable_type), int flags)
 {
 	unsigned long next;
 
···
 			BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd),
 						      READ_ONCE(pmd_val(*pmdp))));
 		} else {
-			alloc_init_cont_pte(pmdp, addr, next, phys, prot,
-					    pgtable_alloc, flags);
+			int ret;
+
+			ret = alloc_init_cont_pte(pmdp, addr, next, phys, prot,
+						  pgtable_alloc, flags);
+			if (ret)
+				return ret;
 
 			BUG_ON(pmd_val(old_pmd) != 0 &&
 			       pmd_val(old_pmd) != READ_ONCE(pmd_val(*pmdp)));
 		}
 		phys += next - addr;
 	} while (pmdp++, addr = next, addr != end);
+
+	return 0;
 }
 
-static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
-				unsigned long end, phys_addr_t phys,
-				pgprot_t prot,
-				phys_addr_t (*pgtable_alloc)(enum pgtable_type),
-				int flags)
+static int alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
+			       unsigned long end, phys_addr_t phys,
+			       pgprot_t prot,
+			       phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			       int flags)
 {
+	int ret;
 	unsigned long next;
 	pud_t pud = READ_ONCE(*pudp);
 	pmd_t *pmdp;
···
 			pudval |= PUD_TABLE_PXN;
 		BUG_ON(!pgtable_alloc);
 		pmd_phys = pgtable_alloc(TABLE_PMD);
+		if (pmd_phys == INVALID_PHYS_ADDR)
+			return -ENOMEM;
 		pmdp = pmd_set_fixmap(pmd_phys);
 		init_clear_pgtable(pmdp);
 		pmdp += pmd_index(addr);
···
 		    (flags & NO_CONT_MAPPINGS) == 0)
 			__prot = __pgprot(pgprot_val(prot) | PTE_CONT);
 
-		init_pmd(pmdp, addr, next, phys, __prot, pgtable_alloc, flags);
+		ret = init_pmd(pmdp, addr, next, phys, __prot, pgtable_alloc, flags);
+		if (ret)
+			goto out;
 
 		pmdp += pmd_index(next) - pmd_index(addr);
 		phys += next - addr;
 	} while (addr = next, addr != end);
 
+out:
 	pmd_clear_fixmap();
+
+	return ret;
 }
 
-static void alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
-			   phys_addr_t phys, pgprot_t prot,
-			   phys_addr_t (*pgtable_alloc)(enum pgtable_type),
-			   int flags)
+static int alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
+			  phys_addr_t phys, pgprot_t prot,
+			  phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			  int flags)
 {
+	int ret = 0;
 	unsigned long next;
 	p4d_t p4d = READ_ONCE(*p4dp);
 	pud_t *pudp;
···
 			p4dval |= P4D_TABLE_PXN;
 		BUG_ON(!pgtable_alloc);
 		pud_phys = pgtable_alloc(TABLE_PUD);
+		if (pud_phys == INVALID_PHYS_ADDR)
+			return -ENOMEM;
 		pudp = pud_set_fixmap(pud_phys);
 		init_clear_pgtable(pudp);
 		pudp += pud_index(addr);
···
 			BUG_ON(!pgattr_change_is_safe(pud_val(old_pud),
 						      READ_ONCE(pud_val(*pudp))));
 		} else {
-			alloc_init_cont_pmd(pudp, addr, next, phys, prot,
-					    pgtable_alloc, flags);
+			ret = alloc_init_cont_pmd(pudp, addr, next, phys, prot,
+						  pgtable_alloc, flags);
+			if (ret)
+				goto out;
 
 			BUG_ON(pud_val(old_pud) != 0 &&
 			       pud_val(old_pud) != READ_ONCE(pud_val(*pudp)));
···
 		phys += next - addr;
 	} while (pudp++, addr = next, addr != end);
 
+out:
 	pud_clear_fixmap();
+
+	return ret;
 }
 
-static void alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
-			   phys_addr_t phys, pgprot_t prot,
-			   phys_addr_t (*pgtable_alloc)(enum pgtable_type),
-			   int flags)
+static int alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
+			  phys_addr_t phys, pgprot_t prot,
+			  phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			  int flags)
 {
+	int ret;
 	unsigned long next;
 	pgd_t pgd = READ_ONCE(*pgdp);
 	p4d_t *p4dp;
···
 			pgdval |= PGD_TABLE_PXN;
 		BUG_ON(!pgtable_alloc);
 		p4d_phys = pgtable_alloc(TABLE_P4D);
+		if (p4d_phys == INVALID_PHYS_ADDR)
+			return -ENOMEM;
 		p4dp = p4d_set_fixmap(p4d_phys);
 		init_clear_pgtable(p4dp);
 		p4dp += p4d_index(addr);
···
 
 		next = p4d_addr_end(addr, end);
 
-		alloc_init_pud(p4dp, addr, next, phys, prot,
-			       pgtable_alloc, flags);
+		ret = alloc_init_pud(p4dp, addr, next, phys, prot,
+				     pgtable_alloc, flags);
+		if (ret)
+			goto out;
 
 		BUG_ON(p4d_val(old_p4d) != 0 &&
 		       p4d_val(old_p4d) != READ_ONCE(p4d_val(*p4dp)));
···
 		phys += next - addr;
 	} while (p4dp++, addr = next, addr != end);
 
+out:
 	p4d_clear_fixmap();
+
+	return ret;
 }
 
-static void __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
-					unsigned long virt, phys_addr_t size,
-					pgprot_t prot,
-					phys_addr_t (*pgtable_alloc)(enum pgtable_type),
-					int flags)
+static int __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
+				       unsigned long virt, phys_addr_t size,
+				       pgprot_t prot,
+				       phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+				       int flags)
 {
+	int ret;
 	unsigned long addr, end, next;
 	pgd_t *pgdp = pgd_offset_pgd(pgdir, virt);
 
···
 	 * within a page, we cannot map the region as the caller expects.
 	 */
 	if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
-		return;
+		return -EINVAL;
 
 	phys &= PAGE_MASK;
 	addr = virt & PAGE_MASK;
···
 
 	do {
 		next = pgd_addr_end(addr, end);
-		alloc_init_p4d(pgdp, addr, next, phys, prot, pgtable_alloc,
-			       flags);
+		ret = alloc_init_p4d(pgdp, addr, next, phys, prot, pgtable_alloc,
+				     flags);
+		if (ret)
+			return ret;
 		phys += next - addr;
 	} while (pgdp++, addr = next, addr != end);
+
+	return 0;
 }
 
-static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
-				 unsigned long virt, phys_addr_t size,
-				 pgprot_t prot,
-				 phys_addr_t (*pgtable_alloc)(enum pgtable_type),
-				 int flags)
+static int __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
+				unsigned long virt, phys_addr_t size,
+				pgprot_t prot,
+				phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+				int flags)
 {
+	int ret;
+
 	mutex_lock(&fixmap_lock);
-	__create_pgd_mapping_locked(pgdir, phys, virt, size, prot,
-				    pgtable_alloc, flags);
+	ret = __create_pgd_mapping_locked(pgdir, phys, virt, size, prot,
+					  pgtable_alloc, flags);
 	mutex_unlock(&fixmap_lock);
+
+	return ret;
 }
 
-#define INVALID_PHYS_ADDR	(-1ULL)
+static void early_create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
+				     unsigned long virt, phys_addr_t size,
+				     pgprot_t prot,
+				     phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+				     int flags)
+{
+	int ret;
+
+	ret = __create_pgd_mapping(pgdir, phys, virt, size, prot, pgtable_alloc,
+				   flags);
+	if (ret)
+		panic("Failed to create page tables\n");
+}
 
 static phys_addr_t __pgd_pgtable_alloc(struct mm_struct *mm, gfp_t gfp,
 				       enum pgtable_type pgtable_type)
···
 }
 
 static phys_addr_t
-try_pgd_pgtable_alloc_init_mm(enum pgtable_type pgtable_type, gfp_t gfp)
+pgd_pgtable_alloc_init_mm_gfp(enum pgtable_type pgtable_type, gfp_t gfp)
 {
 	return __pgd_pgtable_alloc(&init_mm, gfp, pgtable_type);
 }
···
 static phys_addr_t __maybe_unused
 pgd_pgtable_alloc_init_mm(enum pgtable_type pgtable_type)
 {
-	phys_addr_t pa;
-
-	pa = __pgd_pgtable_alloc(&init_mm, GFP_PGTABLE_KERNEL, pgtable_type);
-	BUG_ON(pa == INVALID_PHYS_ADDR);
-	return pa;
+	return pgd_pgtable_alloc_init_mm_gfp(pgtable_type, GFP_PGTABLE_KERNEL);
 }
 
 static phys_addr_t
 pgd_pgtable_alloc_special_mm(enum pgtable_type pgtable_type)
 {
-	phys_addr_t pa;
-
-	pa = __pgd_pgtable_alloc(NULL, GFP_PGTABLE_KERNEL, pgtable_type);
-	BUG_ON(pa == INVALID_PHYS_ADDR);
-	return pa;
+	return  __pgd_pgtable_alloc(NULL, GFP_PGTABLE_KERNEL, pgtable_type);
 }
 
 static void split_contpte(pte_t *ptep)
···
 	pte_t *ptep;
 	int i;
 
-	pte_phys = try_pgd_pgtable_alloc_init_mm(TABLE_PTE, gfp);
+	pte_phys = pgd_pgtable_alloc_init_mm_gfp(TABLE_PTE, gfp);
 	if (pte_phys == INVALID_PHYS_ADDR)
 		return -ENOMEM;
 	ptep = (pte_t *)phys_to_virt(pte_phys);
···
 	pmd_t *pmdp;
 	int i;
 
-	pmd_phys = try_pgd_pgtable_alloc_init_mm(TABLE_PMD, gfp);
+	pmd_phys = pgd_pgtable_alloc_init_mm_gfp(TABLE_PMD, gfp);
 	if (pmd_phys == INVALID_PHYS_ADDR)
 		return -ENOMEM;
 	pmdp = (pmd_t *)phys_to_virt(pmd_phys);
···
 			&phys, virt);
 		return;
 	}
-	__create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
-			     NO_CONT_MAPPINGS);
+	early_create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
+				 NO_CONT_MAPPINGS);
 }
 
 void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
···
 	if (page_mappings_only)
 		flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
 
-	__create_pgd_mapping(mm->pgd, phys, virt, size, prot,
-			     pgd_pgtable_alloc_special_mm, flags);
+	early_create_pgd_mapping(mm->pgd, phys, virt, size, prot,
+				 pgd_pgtable_alloc_special_mm, flags);
 }
 
 static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
···
 		return;
 	}
 
-	__create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
-			     NO_CONT_MAPPINGS);
+	early_create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
+				 NO_CONT_MAPPINGS);
 
 	/* flush the TLBs after updating live kernel mappings */
 	flush_tlb_kernel_range(virt, virt + size);
···
 static void __init __map_memblock(pgd_t *pgdp, phys_addr_t start,
 				  phys_addr_t end, pgprot_t prot, int flags)
 {
-	__create_pgd_mapping(pgdp, start, __phys_to_virt(start), end - start,
-			     prot, early_pgtable_alloc, flags);
+	early_create_pgd_mapping(pgdp, start, __phys_to_virt(start), end - start,
+				 prot, early_pgtable_alloc, flags);
 }
 
 void __init mark_linear_text_alias_ro(void)
···
 	remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings);
 
 	if (!cpu) {
+		int ret;
+
 		alloc = __get_free_pages(GFP_ATOMIC | __GFP_ZERO, order);
 		kpti_ng_temp_pgd = (pgd_t *)(alloc + (levels - 1) * PAGE_SIZE);
 		kpti_ng_temp_alloc = kpti_ng_temp_pgd_pa = __pa(kpti_ng_temp_pgd);
···
 		// covers the PTE[] page itself, the remaining entries are free
 		// to be used as a ad-hoc fixmap.
 		//
-		__create_pgd_mapping_locked(kpti_ng_temp_pgd, __pa(alloc),
-					    KPTI_NG_TEMP_VA, PAGE_SIZE, PAGE_KERNEL,
-					    kpti_ng_pgd_alloc, 0);
+		ret = __create_pgd_mapping_locked(kpti_ng_temp_pgd, __pa(alloc),
+						  KPTI_NG_TEMP_VA, PAGE_SIZE, PAGE_KERNEL,
+						  kpti_ng_pgd_alloc, 0);
+		if (ret)
+			panic("Failed to create page tables\n");
 	}
 
 	cpu_install_idmap();
···
 
 	/* Map only the text into the trampoline page table */
 	memset(tramp_pg_dir, 0, PGD_SIZE);
-	__create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS,
-			     entry_tramp_text_size(), prot,
-			     pgd_pgtable_alloc_init_mm, NO_BLOCK_MAPPINGS);
+	early_create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS,
+				 entry_tramp_text_size(), prot,
+				 pgd_pgtable_alloc_init_mm, NO_BLOCK_MAPPINGS);
 
 	/* Map both the text and data into the kernel page table */
 	for (i = 0; i < DIV_ROUND_UP(entry_tramp_text_size(), PAGE_SIZE); i++)
···
 	if (force_pte_mapping())
 		flags |= NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
 
-	__create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start),
-			     size, params->pgprot, pgd_pgtable_alloc_init_mm,
-			     flags);
+	ret = __create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start),
+				   size, params->pgprot, pgd_pgtable_alloc_init_mm,
+				   flags);
+	if (ret)
+		goto err;
 
 	memblock_clear_nomap(start, size);
 
 	ret = __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
 			   params);
 	if (ret)
-		__remove_pgd_mapping(swapper_pg_dir,
-				     __phys_to_virt(start), size);
-	else {
-		/* Address of hotplugged memory can be smaller */
-		max_pfn = max(max_pfn, PFN_UP(start + size));
-		max_low_pfn = max_pfn;
-	}
+		goto err;
 
+	/* Address of hotplugged memory can be smaller */
+	max_pfn = max(max_pfn, PFN_UP(start + size));
+	max_low_pfn = max_pfn;
+
+	return 0;
+
+err:
+	__remove_pgd_mapping(swapper_pg_dir,
+			     __phys_to_virt(start), size);
 	return ret;
 }
 

arch/arm64/mm/pageattr.c

···
 	unsigned long size = PAGE_SIZE * numpages;
 	unsigned long end = start + size;
 	struct vm_struct *area;
-	int i;
 
 	if (!PAGE_ALIGNED(addr)) {
 		start &= PAGE_MASK;
···
 	 */
 	if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY ||
 			    pgprot_val(clear_mask) == PTE_RDONLY)) {
-		for (i = 0; i < area->nr_pages; i++) {
-			__change_memory_common((u64)page_address(area->pages[i]),
+		unsigned long idx = (start - (unsigned long)kasan_reset_tag(area->addr))
+				    >> PAGE_SHIFT;
+		for (; numpages; idx++, numpages--) {
+			__change_memory_common((u64)page_address(area->pages[idx]),
 					       PAGE_SIZE, set_mask, clear_mask);
 		}
 	}

arch/arm64/mm/pgd.c

···
 	 * With 52-bit physical addresses, the architecture requires the
 	 * top-level table to be aligned to at least 64 bytes.
 	 */
-	BUILD_BUG_ON(PGD_SIZE < 64);
+	BUILD_BUG_ON(!IS_ALIGNED(PGD_SIZE, 64));
 #endif
 
 	/*

arch/arm64/net/bpf_jit_comp.c

···
 	/* We unwind through both kernel frames starting from within bpf_throw
 	 * call and BPF frames. Therefore we require FP unwinder to be enabled
 	 * to walk kernel frames and reach BPF frames in the stack trace.
-	 * ARM64 kernel is aways compiled with CONFIG_FRAME_POINTER=y
+	 * ARM64 kernel is always compiled with CONFIG_FRAME_POINTER=y
 	 */
 	return true;
 }

drivers/Kconfig

···
 
 source "drivers/cdx/Kconfig"
 
+source "drivers/resctrl/Kconfig"
+
 endmenu

drivers/Makefile

···
 obj-$(CONFIG_DRM_ACCEL)		+= accel/
 obj-$(CONFIG_CDX_BUS)		+= cdx/
 obj-$(CONFIG_DPLL)		+= dpll/
+obj-y				+= resctrl/
 
 obj-$(CONFIG_DIBS)		+= dibs/
 obj-$(CONFIG_S390)		+= s390/

drivers/acpi/arm64/Kconfig

···
 
 config ACPI_APMT
 	bool
+
+config ACPI_MPAM
+	bool

drivers/acpi/arm64/Makefile

···
 obj-$(CONFIG_ACPI_FFH)		+= ffh.o
 obj-$(CONFIG_ACPI_GTDT) 	+= gtdt.o
 obj-$(CONFIG_ACPI_IORT) 	+= iort.o
+obj-$(CONFIG_ACPI_MPAM) 	+= mpam.o
 obj-$(CONFIG_ACPI_PROCESSOR_IDLE) += cpuidle.o
 obj-$(CONFIG_ARM_AMBA)		+= amba.o
 obj-y				+= dma.o init.o

drivers/acpi/arm64/gtdt.c

···
 	return -EINVAL;
 }
 
-/**
- * acpi_arch_timer_mem_init() - Get the info of all GT blocks in GTDT table.
- * @timer_mem:	The pointer to the array of struct arch_timer_mem for returning
- *		the result of parsing. The element number of this array should
- *		be platform_timer_count(the total number of platform timers).
- * @timer_count: It points to a integer variable which is used for storing the
- *		number of GT blocks we have parsed.
- *
- * Return: 0 if success, -EINVAL/-ENODEV if error.
- */
-int __init acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem,
-				    int *timer_count)
-{
-	int ret;
-	void *platform_timer;
-
-	*timer_count = 0;
-	for_each_platform_timer(platform_timer) {
-		if (is_timer_block(platform_timer)) {
-			ret = gtdt_parse_timer_block(platform_timer, timer_mem);
-			if (ret)
-				return ret;
-			timer_mem++;
-			(*timer_count)++;
-		}
-	}
-
-	if (*timer_count)
-		pr_info("found %d memory-mapped timer block(s).\n",
-			*timer_count);
-
-	return 0;
-}
-
 /*
  * Initialize a SBSA generic Watchdog platform device info from GTDT
  */

drivers/acpi/arm64/mpam.c

···
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2025 Arm Ltd.
+
+/* Parse the MPAM ACPI table feeding the discovered nodes into the driver */
+
+#define pr_fmt(fmt) "ACPI MPAM: " fmt
+
+#include <linux/acpi.h>
+#include <linux/arm_mpam.h>
+#include <linux/bits.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/platform_device.h>
+
+#include <acpi/processor.h>
+
+/*
+ * Flags for acpi_table_mpam_msc.*_interrupt_flags.
+ * See 2.1.1 Interrupt Flags, Table 5, of DEN0065B_MPAM_ACPI_3.0-bet.
+ */
+#define ACPI_MPAM_MSC_IRQ_MODE                              BIT(0)
+#define ACPI_MPAM_MSC_IRQ_TYPE_MASK                         GENMASK(2, 1)
+#define ACPI_MPAM_MSC_IRQ_TYPE_WIRED                        0
+#define ACPI_MPAM_MSC_IRQ_AFFINITY_TYPE_MASK                BIT(3)
+#define ACPI_MPAM_MSC_IRQ_AFFINITY_TYPE_PROCESSOR           0
+#define ACPI_MPAM_MSC_IRQ_AFFINITY_TYPE_PROCESSOR_CONTAINER 1
+#define ACPI_MPAM_MSC_IRQ_AFFINITY_VALID                    BIT(4)
+
+/*
+ * Encodings for the MSC node body interface type field.
+ * See 2.1 MPAM MSC node, Table 4 of DEN0065B_MPAM_ACPI_3.0-bet.
+ */
+#define ACPI_MPAM_MSC_IFACE_MMIO   0x00
+#define ACPI_MPAM_MSC_IFACE_PCC    0x0a
+
+static bool _is_ppi_partition(u32 flags)
+{
+	u32 aff_type, is_ppi;
+	bool ret;
+
+	is_ppi = FIELD_GET(ACPI_MPAM_MSC_IRQ_AFFINITY_VALID, flags);
+	if (!is_ppi)
+		return false;
+
+	aff_type = FIELD_GET(ACPI_MPAM_MSC_IRQ_AFFINITY_TYPE_MASK, flags);
+	ret = (aff_type == ACPI_MPAM_MSC_IRQ_AFFINITY_TYPE_PROCESSOR_CONTAINER);
+	if (ret)
+		pr_err_once("Partitioned interrupts not supported\n");
+
+	return ret;
+}
+
+static int acpi_mpam_register_irq(struct platform_device *pdev,
+				  u32 intid, u32 flags)
+{
+	int irq;
+	u32 int_type;
+	int trigger;
+
+	if (!intid)
+		return -EINVAL;
+
+	if (_is_ppi_partition(flags))
+		return -EINVAL;
+
+	trigger = FIELD_GET(ACPI_MPAM_MSC_IRQ_MODE, flags);
+	int_type = FIELD_GET(ACPI_MPAM_MSC_IRQ_TYPE_MASK, flags);
+	if (int_type != ACPI_MPAM_MSC_IRQ_TYPE_WIRED)
+		return -EINVAL;
+
+	irq = acpi_register_gsi(&pdev->dev, intid, trigger, ACPI_ACTIVE_HIGH);
+	if (irq < 0)
+		pr_err_once("Failed to register interrupt 0x%x with ACPI\n", intid);
+
+	return irq;
+}
+
+static void acpi_mpam_parse_irqs(struct platform_device *pdev,
+				 struct acpi_mpam_msc_node *tbl_msc,
+				 struct resource *res, int *res_idx)
+{
+	u32 flags, intid;
+	int irq;
+
+	intid = tbl_msc->overflow_interrupt;
+	flags = tbl_msc->overflow_interrupt_flags;
+	irq = acpi_mpam_register_irq(pdev, intid, flags);
+	if (irq > 0)
+		res[(*res_idx)++] = DEFINE_RES_IRQ_NAMED(irq, "overflow");
+
+	intid = tbl_msc->error_interrupt;
+	flags = tbl_msc->error_interrupt_flags;
+	irq = acpi_mpam_register_irq(pdev, intid, flags);
+	if (irq > 0)
+		res[(*res_idx)++] = DEFINE_RES_IRQ_NAMED(irq, "error");
+}
+
+static int acpi_mpam_parse_resource(struct mpam_msc *msc,
+				    struct acpi_mpam_resource_node *res)
+{
+	int level, nid;
+	u32 cache_id;
+
+	switch (res->locator_type) {
+	case ACPI_MPAM_LOCATION_TYPE_PROCESSOR_CACHE:
+		cache_id = res->locator.cache_locator.cache_reference;
+		level = find_acpi_cache_level_from_id(cache_id);
+		if (level <= 0) {
+			pr_err_once("Bad level (%d) for cache with id %u\n", level, cache_id);
+			return -EINVAL;
+		}
+		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_CACHE,
+				       level, cache_id);
+	case ACPI_MPAM_LOCATION_TYPE_MEMORY:
+		nid = pxm_to_node(res->locator.memory_locator.proximity_domain);
+		if (nid == NUMA_NO_NODE) {
+			pr_debug("Bad proximity domain %lld, using node 0 instead\n",
+				 res->locator.memory_locator.proximity_domain);
+			nid = 0;
+		}
+		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_MEMORY,
+				       MPAM_CLASS_ID_DEFAULT, nid);
+	default:
+		/* These get discovered later and are treated as unknown */
+		return 0;
+	}
+}
+
+int acpi_mpam_parse_resources(struct mpam_msc *msc,
+			      struct acpi_mpam_msc_node *tbl_msc)
+{
+	int i, err;
+	char *ptr, *table_end;
+	struct acpi_mpam_resource_node *resource;
+
+	table_end = (char *)tbl_msc + tbl_msc->length;
+	ptr = (char *)(tbl_msc + 1);
+	for (i = 0; i < tbl_msc->num_resource_nodes; i++) {
+		u64 max_deps, remaining_table;
+
+		if (ptr + sizeof(*resource) > table_end)
+			return -EINVAL;
+
+		resource = (struct acpi_mpam_resource_node *)ptr;
+
+		remaining_table = table_end - ptr;
+		max_deps = remaining_table / sizeof(struct acpi_mpam_func_deps);
+		if (resource->num_functional_deps > max_deps) {
+			pr_debug("MSC has impossible number of functional dependencies\n");
+			return -EINVAL;
+		}
+
+		err = acpi_mpam_parse_resource(msc, resource);
+		if (err)
+			return err;
+
+		ptr += sizeof(*resource);
+		ptr += resource->num_functional_deps * sizeof(struct acpi_mpam_func_deps);
+	}
+
+	return 0;
+}
+
+/*
+ * Creates the device power management link and returns true if the
+ * acpi id is valid and usable for cpu affinity.  This is the case
+ * when the linked device is a processor or a processor container.
+ */
+static bool __init parse_msc_pm_link(struct acpi_mpam_msc_node *tbl_msc,
+				     struct platform_device *pdev,
+				     u32 *acpi_id)
+{
+	char hid[sizeof(tbl_msc->hardware_id_linked_device) + 1] = { 0 };
+	bool acpi_id_valid = false;
+	struct acpi_device *buddy;
+	char uid[11];
+	int len;
+
+	memcpy(hid, &tbl_msc->hardware_id_linked_device,
+	       sizeof(tbl_msc->hardware_id_linked_device));
+
+	if (!strcmp(hid, ACPI_PROCESSOR_CONTAINER_HID)) {
+		*acpi_id = tbl_msc->instance_id_linked_device;
+		acpi_id_valid = true;
+	}
+
+	len = snprintf(uid, sizeof(uid), "%u",
+		       tbl_msc->instance_id_linked_device);
+	if (len >= sizeof(uid)) {
+		pr_debug("Failed to convert uid of device for power management.");
+		return acpi_id_valid;
+	}
+
+	buddy = acpi_dev_get_first_match_dev(hid, uid, -1);
+	if (buddy) {
+		device_link_add(&pdev->dev, &buddy->dev, DL_FLAG_STATELESS);
+		acpi_dev_put(buddy);
+	}
+
+	return acpi_id_valid;
+}
+
+static int decode_interface_type(struct acpi_mpam_msc_node *tbl_msc,
+				 enum mpam_msc_iface *iface)
+{
+	switch (tbl_msc->interface_type) {
+	case ACPI_MPAM_MSC_IFACE_MMIO:
+		*iface = MPAM_IFACE_MMIO;
+		return 0;
+	case ACPI_MPAM_MSC_IFACE_PCC:
+		*iface = MPAM_IFACE_PCC;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct platform_device * __init acpi_mpam_parse_msc(struct acpi_mpam_msc_node *tbl_msc)
+{
+	struct platform_device *pdev __free(platform_device_put) =
+		platform_device_alloc("mpam_msc", tbl_msc->identifier);
+	int next_res = 0, next_prop = 0, err;
+	/* pcc, nrdy, affinity and a sentinel */
+	struct property_entry props[4] = { 0 };
+	/* mmio, 2xirq, no sentinel. */
+	struct resource res[3] = { 0 };
+	struct acpi_device *companion;
+	enum mpam_msc_iface iface;
+	char uid[16];
+	u32 acpi_id;
+
+	if (!pdev)
+		return ERR_PTR(-ENOMEM);
+
+	/* Some power management is described in the namespace: */
+	err = snprintf(uid, sizeof(uid), "%u", tbl_msc->identifier);
+	if (err > 0 && err < sizeof(uid)) {
+		companion = acpi_dev_get_first_match_dev("ARMHAA5C", uid, -1);
+		if (companion) {
+			ACPI_COMPANION_SET(&pdev->dev, companion);
+			acpi_dev_put(companion);
+		} else {
+			pr_debug("MSC.%u: missing namespace entry\n", tbl_msc->identifier);
+		}
+	}
+
+	if (decode_interface_type(tbl_msc, &iface)) {
+		pr_debug("MSC.%u: unknown interface type\n", tbl_msc->identifier);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (iface == MPAM_IFACE_MMIO) {
+		res[next_res++] = DEFINE_RES_MEM_NAMED(tbl_msc->base_address,
+						       tbl_msc->mmio_size,
+						       "MPAM:MSC");
+	} else if (iface == MPAM_IFACE_PCC) {
+		props[next_prop++] = PROPERTY_ENTRY_U32("pcc-channel",
+							tbl_msc->base_address);
+	}
+
+	acpi_mpam_parse_irqs(pdev, tbl_msc, res, &next_res);
+
+	WARN_ON_ONCE(next_res > ARRAY_SIZE(res));
+	err = platform_device_add_resources(pdev, res, next_res);
+	if (err)
+		return ERR_PTR(err);
+
+	props[next_prop++] = PROPERTY_ENTRY_U32("arm,not-ready-us",
+						tbl_msc->max_nrdy_usec);
+
+	/*
+	 * The MSC's CPU affinity is described via its linked power
+	 * management device, but only if it points at a Processor or
+	 * Processor Container.
+	 */
+	if (parse_msc_pm_link(tbl_msc, pdev, &acpi_id))
+		props[next_prop++] = PROPERTY_ENTRY_U32("cpu_affinity", acpi_id);
+
+	WARN_ON_ONCE(next_prop > ARRAY_SIZE(props) - 1);
+	err = device_create_managed_software_node(&pdev->dev, props, NULL);
+	if (err)
+		return ERR_PTR(err);
+
+	/*
+	 * Stash the table entry for acpi_mpam_parse_resources() to discover
+	 * what this MSC controls.
+	 */
+	err = platform_device_add_data(pdev, tbl_msc, tbl_msc->length);
+	if (err)
+		return ERR_PTR(err);
+
+	err = platform_device_add(pdev);
+	if (err)
+		return ERR_PTR(err);
+
+	return_ptr(pdev);
+}
+
+static int __init acpi_mpam_parse(void)
+{
+	char *table_end, *table_offset;
+	struct acpi_mpam_msc_node *tbl_msc;
+	struct platform_device *pdev;
+
+	if (acpi_disabled || !system_supports_mpam())
+		return 0;
+
+	struct acpi_table_header *table __free(acpi_put_table) =
+		acpi_get_table_pointer(ACPI_SIG_MPAM, 0);
+
+	if (IS_ERR(table))
+		return 0;
+
+	if (table->revision < 1) {
+		pr_debug("MPAM ACPI table revision %d not supported\n", table->revision);
+		return 0;
+	}
+
+	table_offset = (char *)(table + 1);
+	table_end = (char *)table + table->length;
+
+	while (table_offset < table_end) {
+		tbl_msc = (struct acpi_mpam_msc_node *)table_offset;
+		if (table_offset + sizeof(*tbl_msc) > table_end ||
+		    table_offset + tbl_msc->length > table_end) {
+			pr_err("MSC entry overlaps end of ACPI table\n");
+			return -EINVAL;
+		}
+		table_offset += tbl_msc->length;
+
+		/*
+		 * If any of the reserved fields are set, make no attempt to
+		 * parse the MSC structure. This MSC will still be counted by
+		 * acpi_mpam_count_msc(), meaning the MPAM driver can't probe
+		 * against all MSC, and will never be enabled. There is no way
+		 * to enable it safely, because we cannot determine safe
+		 * system-wide partid and pmg ranges in this situation.
+		 */
+		if (tbl_msc->reserved || tbl_msc->reserved1 || tbl_msc->reserved2) {
+			pr_err_once("Unrecognised MSC, MPAM not usable\n");
+			pr_debug("MSC.%u: reserved field set\n", tbl_msc->identifier);
+			continue;
+		}
+
+		if (!tbl_msc->mmio_size) {
+			pr_debug("MSC.%u: marked as disabled\n", tbl_msc->identifier);
+			continue;
+		}
+
+		pdev = acpi_mpam_parse_msc(tbl_msc);
+		if (IS_ERR(pdev))
+			return PTR_ERR(pdev);
+	}
+
+	return 0;
+}
+
+/**
+ * acpi_mpam_count_msc() - Count the number of MSC described by firmware.
+ *
+ * Returns the number of MSCs, or zero for an error.
+ *
+ * This can be called before or in parallel with acpi_mpam_parse().
+ */
+int acpi_mpam_count_msc(void)
+{
+	char *table_end, *table_offset;
+	struct acpi_mpam_msc_node *tbl_msc;
+	int count = 0;
+
+	if (acpi_disabled || !system_supports_mpam())
+		return 0;
+
+	struct acpi_table_header *table __free(acpi_put_table) =
+		acpi_get_table_pointer(ACPI_SIG_MPAM, 0);
+
+	if (IS_ERR(table))
+		return 0;
+
+	if (table->revision < 1)
+		return 0;
+
+	table_offset = (char *)(table + 1);
+	table_end = (char *)table + table->length;
+
+	while (table_offset < table_end) {
+		tbl_msc = (struct acpi_mpam_msc_node *)table_offset;
+
+		if (table_offset + sizeof(*tbl_msc) > table_end)
+			return -EINVAL;
+		if (tbl_msc->length < sizeof(*tbl_msc))
+			return -EINVAL;
+		if (tbl_msc->length > table_end - table_offset)
+			return -EINVAL;
+		table_offset += tbl_msc->length;
+
+		if (!tbl_msc->mmio_size)
+			continue;
+
+		count++;
+	}
+
+	return count;
+}
+
+/*
+ * Call after ACPI devices have been created, which happens behind acpi_scan_init()
+ * called from subsys_initcall(). PCC requires the mailbox driver, which is
+ * initialised from postcore_initcall().
+ */
+subsys_initcall_sync(acpi_mpam_parse);

drivers/acpi/pptt.c

···
 #include <linux/cacheinfo.h>
 #include <acpi/processor.h>
 
+/*
+ * The acpi_pptt_cache_v1 in actbl2.h, which is imported from acpica,
+ * only contains the cache_id field rather than all the fields of the
+ * Cache Type Structure. Use this alternative structure until it is
+ * resolved in acpica.
+ */
+struct acpi_pptt_cache_v1_full {
+	struct acpi_subtable_header header;
+	u16 reserved;
+	u32 flags;
+	u32 next_level_of_cache;
+	u32 size;
+	u32 number_of_sets;
+	u8 associativity;
+	u8 attributes;
+	u16 line_size;
+	u32 cache_id;
+} __packed;
+
 static struct acpi_subtable_header *fetch_pptt_subtable(struct acpi_table_header *table_hdr,
 							u32 pptt_ref)
 {
···
 						u32 pptt_ref)
 {
 	return (struct acpi_pptt_cache *)fetch_pptt_subtable(table_hdr, pptt_ref);
+}
+
+static struct acpi_pptt_cache_v1_full *upgrade_pptt_cache(struct acpi_pptt_cache *cache)
+{
+	if (cache->header.length < sizeof(struct acpi_pptt_cache_v1_full))
+		return NULL;
+
+	/* No use for v1 if the only additional field is invalid */
+	if (!(cache->flags & ACPI_PPTT_CACHE_ID_VALID))
+		return NULL;
+
+	return (struct acpi_pptt_cache_v1_full *)cache;
 }
 
 static struct acpi_subtable_header *acpi_get_pptt_resource(struct acpi_table_header *table_hdr,
···
 }
 
 /**
- * acpi_count_levels() - Given a PPTT table, and a CPU node, count the cache
- * levels and split cache levels (data/instruction).
+ * acpi_count_levels() - Given a PPTT table, and a CPU node, count the
+ * total number of levels and split cache levels (data/instruction).
  * @table_hdr: Pointer to the head of the PPTT table
  * @cpu_node: processor node we wish to count caches for
- * @levels: Number of levels if success.
  * @split_levels:	Number of split cache levels (data/instruction) if
  *			success. Can by NULL.
  *
+ * Return: number of levels.
  * Given a processor node containing a processing unit, walk into it and count
  * how many levels exist solely for it, and then walk up each level until we hit
  * the root node (ignore the package level because it may be possible to have
···
  * split cache levels (data/instruction) that exist at each level on the way
  * up.
  */
-static void acpi_count_levels(struct acpi_table_header *table_hdr,
-			      struct acpi_pptt_processor *cpu_node,
-			      unsigned int *levels, unsigned int *split_levels)
+static int acpi_count_levels(struct acpi_table_header *table_hdr,
+			     struct acpi_pptt_processor *cpu_node,
+			     unsigned int *split_levels)
 {
+	int current_level = 0;
+
 	do {
-		acpi_find_cache_level(table_hdr, cpu_node, levels, split_levels, 0, 0);
+		acpi_find_cache_level(table_hdr, cpu_node, &current_level, split_levels, 0, 0);
 		cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
 	} while (cpu_node);
+
+	return current_level;
 }
 
 /**
···
  * @this_leaf: Kernel cache info structure being updated
  * @found_cache: The PPTT node describing this cache instance
  * @cpu_node: A unique reference to describe this cache instance
- * @revision: The revision of the PPTT table
  *
  * The ACPI spec implies that the fields in the cache structures are used to
  * extend and correct the information probed from the hardware. Lets only
···
  */
 static void update_cache_properties(struct cacheinfo *this_leaf,
 				    struct acpi_pptt_cache *found_cache,
-				    struct acpi_pptt_processor *cpu_node,
-				    u8 revision)
+				    struct acpi_pptt_processor *cpu_node)
 {
-	struct acpi_pptt_cache_v1* found_cache_v1;
+	struct acpi_pptt_cache_v1_full *found_cache_v1;
 
 	this_leaf->fw_token = cpu_node;
 	if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID)
···
 	    found_cache->flags & ACPI_PPTT_CACHE_TYPE_VALID)
 		this_leaf->type = CACHE_TYPE_UNIFIED;
 
-	if (revision >= 3 && (found_cache->flags & ACPI_PPTT_CACHE_ID_VALID)) {
-		found_cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1,
-	                                      found_cache, sizeof(struct acpi_pptt_cache));
+	found_cache_v1 = upgrade_pptt_cache(found_cache);
+	if (found_cache_v1) {
 		this_leaf->id = found_cache_v1->cache_id;
 		this_leaf->attributes |= CACHE_ID;
 	}
···
 		pr_debug("found = %p %p\n", found_cache, cpu_node);
 		if (found_cache)
 			update_cache_properties(this_leaf, found_cache,
-						ACPI_TO_POINTER(ACPI_PTR_DIFF(cpu_node, table)),
-						table->revision);
+						ACPI_TO_POINTER(ACPI_PTR_DIFF(cpu_node, table)));
 
 		index++;
 	}
···
 	if (!cpu_node)
 		return -ENOENT;
 
-	acpi_count_levels(table, cpu_node, levels, split_levels);
+	*levels = acpi_count_levels(table, cpu_node, split_levels);
 
 	pr_debug("Cache Setup: last_level=%d split_levels=%d\n",
 		 *levels, split_levels ? *split_levels : -1);
···
 {
 	return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE,
 					  ACPI_PPTT_ACPI_IDENTICAL);
+}
+
+/**
+ * acpi_pptt_get_child_cpus() - Find all the CPUs below a PPTT
+ * processor hierarchy node
+ *
+ * @table_hdr:		A reference to the PPTT table
+ * @parent_node:	A pointer to the processor hierarchy node in the
+ *			table_hdr
+ * @cpus:		A cpumask to fill with the CPUs below @parent_node
+ *
+ * Walks up the PPTT from every possible CPU to find if the provided
+ * @parent_node is a parent of this CPU.
+ */
+static void acpi_pptt_get_child_cpus(struct acpi_table_header *table_hdr,
+				     struct acpi_pptt_processor *parent_node,
+				     cpumask_t *cpus)
+{
+	struct acpi_pptt_processor *cpu_node;
+	u32 acpi_id;
+	int cpu;
+
+	cpumask_clear(cpus);
+
+	for_each_possible_cpu(cpu) {
+		acpi_id = get_acpi_id_for_cpu(cpu);
+		cpu_node = acpi_find_processor_node(table_hdr, acpi_id);
+
+		while (cpu_node) {
+			if (cpu_node == parent_node) {
+				cpumask_set_cpu(cpu, cpus);
+				break;
+			}
+			cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
+		}
+	}
+}
+
+/**
+ * acpi_pptt_get_cpus_from_container() - Populate a cpumask with all CPUs in a
+ *                                       processor container
+ * @acpi_cpu_id:	The UID of the processor container
+ * @cpus:		The resulting CPU mask
+ *
+ * Find the specified Processor Container, and fill @cpus with all the cpus
+ * below it.
+ *
+ * Not all 'Processor Hierarchy' entries in the PPTT are either a CPU
+ * or a Processor Container, they may exist purely to describe a
+ * Private resource. CPUs have to be leaves, so a Processor Container
+ * is a non-leaf that has the 'ACPI Processor ID valid' flag set.
+ */
+void acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus)
+{
+	struct acpi_table_header *table_hdr;
+	struct acpi_subtable_header *entry;
+	unsigned long table_end;
+	u32 proc_sz;
+
+	cpumask_clear(cpus);
+
+	table_hdr = acpi_get_pptt();
+	if (!table_hdr)
+		return;
+
+	table_end = (unsigned long)table_hdr + table_hdr->length;
+	entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
+			     sizeof(struct acpi_table_pptt));
+	proc_sz = sizeof(struct acpi_pptt_processor);
+	while ((unsigned long)entry + proc_sz <= table_end) {
+		if (entry->type == ACPI_PPTT_TYPE_PROCESSOR) {
+			struct acpi_pptt_processor *cpu_node;
+
+			cpu_node = (struct acpi_pptt_processor *)entry;
+			if (cpu_node->flags & ACPI_PPTT_ACPI_PROCESSOR_ID_VALID &&
+			    !acpi_pptt_leaf_node(table_hdr, cpu_node) &&
+			    cpu_node->acpi_processor_id == acpi_cpu_id) {
+				acpi_pptt_get_child_cpus(table_hdr, cpu_node, cpus);
+				break;
+			}
+		}
+		entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
+				     entry->length);
+	}
+}
+
+/**
+ * find_acpi_cache_level_from_id() - Get the level of the specified cache
+ * @cache_id: The id field of the cache
+ *
+ * Determine the level relative to any CPU for the cache identified by
+ * cache_id. This allows the property to be found even if the CPUs are offline.
+ *
+ * The returned level can be used to group caches that are peers.
+ *
+ * The PPTT table must be rev 3 or later.
+ *
+ * If one CPU's L2 is shared with another CPU as L3, this function will return
+ * an unpredictable value.
+ *
+ * Return: -ENOENT if the PPTT doesn't exist, the revision isn't supported or
+ * the cache cannot be found.
+ * Otherwise returns a value which represents the level of the specified cache.
+ */
+int find_acpi_cache_level_from_id(u32 cache_id)
+{
+	int cpu;
+	struct acpi_table_header *table;
+
+	table = acpi_get_pptt();
+	if (!table)
+		return -ENOENT;
+
+	if (table->revision < 3)
+		return -ENOENT;
+
+	for_each_possible_cpu(cpu) {
+		bool empty;
+		int level = 1;
+		u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
+		struct acpi_pptt_cache *cache;
+		struct acpi_pptt_processor *cpu_node;
+
+		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
+		if (!cpu_node)
+			continue;
+
+		do {
+			int cache_type[] = {CACHE_TYPE_INST, CACHE_TYPE_DATA, CACHE_TYPE_UNIFIED};
+
+			empty = true;
+			for (int i = 0; i < ARRAY_SIZE(cache_type); i++) {
+				struct acpi_pptt_cache_v1_full *cache_v1;
+
+				cache = acpi_find_cache_node(table, acpi_cpu_id, cache_type[i],
+							     level, &cpu_node);
+				if (!cache)
+					continue;
+
+				empty = false;
+
+				cache_v1 = upgrade_pptt_cache(cache);
+				if (cache_v1 && cache_v1->cache_id == cache_id)
+					return level;
+			}
+			level++;
+		} while (!empty);
+	}
+
+	return -ENOENT;
+}
+
+/**
+ * acpi_pptt_get_cpumask_from_cache_id() - Get the cpus associated with the
+ *					   specified cache
+ * @cache_id: The id field of the cache
+ * @cpus: Where to build the cpumask
+ *
+ * Determine which CPUs are below this cache in the PPTT. This allows the property
+ * to be found even if the CPUs are offline.
+ *
+ * The PPTT table must be rev 3 or later,
+ *
+ * Return: -ENOENT if the PPTT doesn't exist, or the cache cannot be found.
+ * Otherwise returns 0 and sets the cpus in the provided cpumask.
+ */
+int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus)
+{
+	int cpu;
+	struct acpi_table_header *table;
+
+	cpumask_clear(cpus);
+
+	table = acpi_get_pptt();
+	if (!table)
+		return -ENOENT;
+
+	if (table->revision < 3)
+		return -ENOENT;
+
+	for_each_possible_cpu(cpu) {
+		bool empty;
+		int level = 1;
+		u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
+		struct acpi_pptt_cache *cache;
+		struct acpi_pptt_processor *cpu_node;
+
+		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
+		if (!cpu_node)
+			continue;
+
+		do {
+			int cache_type[] = {CACHE_TYPE_INST, CACHE_TYPE_DATA, CACHE_TYPE_UNIFIED};
+
+			empty = true;
+			for (int i = 0; i < ARRAY_SIZE(cache_type); i++) {
+				struct acpi_pptt_cache_v1_full *cache_v1;
+
+				cache = acpi_find_cache_node(table, acpi_cpu_id, cache_type[i],
+							     level, &cpu_node);
+
+				if (!cache)
+					continue;
+
+				empty = false;
+
+				cache_v1 = upgrade_pptt_cache(cache);
+				if (cache_v1 && cache_v1->cache_id == cache_id)
+					cpumask_set_cpu(cpu, cpus);
+			}
+			level++;
+		} while (!empty);
+	}
+
+	return 0;
 }

drivers/acpi/tables.c

···
 	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
 	ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
-	ACPI_SIG_NBFT, ACPI_SIG_SWFT};
+	ACPI_SIG_NBFT, ACPI_SIG_SWFT, ACPI_SIG_MPAM};
 
 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 

drivers/firmware/efi/efi.c

···
 	.page_table_lock	= __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
 	.mmlist			= LIST_HEAD_INIT(efi_mm.mmlist),
 	.cpu_bitmap		= { [BITS_TO_LONGS(NR_CPUS)] = 0},
+#ifdef CONFIG_SCHED_MM_CID
+	.cpus_allowed_lock	= __RAW_SPIN_LOCK_UNLOCKED(efi_mm.cpus_allowed_lock),
+#endif
 };
 
 struct workqueue_struct *efi_rts_wq;

drivers/firmware/efi/runtime-wrappers.c

···
  */
 static DEFINE_SEMAPHORE(efi_runtime_lock, 1);
 
+static struct task_struct *efi_runtime_lock_owner;
+
 /*
  * Expose the EFI runtime lock to the UV platform
  */
···
 	const union efi_rts_args *args = efi_rts_work.args;
 	efi_status_t status = EFI_NOT_FOUND;
 	unsigned long flags;
+
+	efi_runtime_lock_owner = current;
 
 	arch_efi_call_virt_setup();
 	flags = efi_call_virt_save_flags();
···
 
 	efi_rts_work.status = status;
 	complete(&efi_rts_work.efi_rts_comp);
+	efi_runtime_lock_owner = NULL;
 }
 
 static efi_status_t __efi_queue_work(enum efi_rts_ids id,
···
 	if (down_trylock(&efi_runtime_lock))
 		return EFI_NOT_READY;
 
+	efi_runtime_lock_owner = current;
 	status = efi_call_virt_pointer(efi.runtime, set_variable, name, vendor,
 				       attr, data_size, data);
+	efi_runtime_lock_owner = NULL;
 	up(&efi_runtime_lock);
 	return status;
 }
···
 	if (down_trylock(&efi_runtime_lock))
 		return EFI_NOT_READY;
 
+	efi_runtime_lock_owner = current;
 	status = efi_call_virt_pointer(efi.runtime, query_variable_info, attr,
 				       storage_space, remaining_space,
 				       max_variable_size);
+	efi_runtime_lock_owner = NULL;
 	up(&efi_runtime_lock);
 	return status;
 }
···
 		return;
 	}
 
+	efi_runtime_lock_owner = current;
 	arch_efi_call_virt_setup();
 	efi_rts_work.efi_rts_id = EFI_RESET_SYSTEM;
 	arch_efi_call_virt(efi.runtime, reset_system, reset_type, status,
 			   data_size, data);
 	arch_efi_call_virt_teardown();
-
+	efi_runtime_lock_owner = NULL;
 	up(&efi_runtime_lock);
 }
 
···
 }
 
 #endif
+
+void efi_runtime_assert_lock_held(void)
+{
+	WARN_ON(efi_runtime_lock_owner != current);
+}

drivers/resctrl/Kconfig

···
+menuconfig ARM64_MPAM_DRIVER
+	bool "MPAM driver"
+	depends on ARM64 && ARM64_MPAM && EXPERT
+	help
+	  Memory System Resource Partitioning and Monitoring (MPAM) driver for
+	  System IP, e.g. caches and memory controllers.
+
+if ARM64_MPAM_DRIVER
+
+config ARM64_MPAM_DRIVER_DEBUG
+	bool "Enable debug messages from the MPAM driver"
+	help
+	  Say yes here to enable debug messages from the MPAM driver.
+
+config MPAM_KUNIT_TEST
+	bool "KUnit tests for MPAM driver " if !KUNIT_ALL_TESTS
+	depends on KUNIT=y
+	default KUNIT_ALL_TESTS
+	help
+	  Enable this option to run tests in the MPAM driver.
+
+	  If unsure, say N.
+
+endif

drivers/resctrl/Makefile

···
+obj-$(CONFIG_ARM64_MPAM_DRIVER)			+= mpam.o
+mpam-y						+= mpam_devices.o
+
+ccflags-$(CONFIG_ARM64_MPAM_DRIVER_DEBUG)	+= -DDEBUG

drivers/resctrl/mpam_devices.c

···
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2025 Arm Ltd.
+
+#define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__
+
+#include <linux/acpi.h>
+#include <linux/atomic.h>
+#include <linux/arm_mpam.h>
+#include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/cacheinfo.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/list.h>
+#include <linux/lockdep.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/srcu.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "mpam_internal.h"
+
+DEFINE_STATIC_KEY_FALSE(mpam_enabled); /* This moves to arch code */
+
+/*
+ * mpam_list_lock protects the SRCU lists when writing. Once the
+ * mpam_enabled key is enabled these lists are read-only,
+ * unless the error interrupt disables the driver.
+ */
+static DEFINE_MUTEX(mpam_list_lock);
+static LIST_HEAD(mpam_all_msc);
+
+struct srcu_struct mpam_srcu;
+
+/*
+ * Number of MSCs that have been probed. Once all MSCs have been probed MPAM
+ * can be enabled.
+ */
+static atomic_t mpam_num_msc;
+
+static int mpam_cpuhp_state;
+static DEFINE_MUTEX(mpam_cpuhp_state_lock);
+
+/*
+ * The smallest common values for any CPU or MSC in the system.
+ * Generating traffic outside this range will result in screaming interrupts.
+ */
+u16 mpam_partid_max;
+u8 mpam_pmg_max;
+static bool partid_max_init, partid_max_published;
+static DEFINE_SPINLOCK(partid_max_lock);
+
+/*
+ * mpam is enabled once all devices have been probed from CPU online callbacks,
+ * scheduled via this work_struct. If access to an MSC depends on a CPU that
+ * was not brought online at boot, this can happen surprisingly late.
+ */
+static DECLARE_WORK(mpam_enable_work, &mpam_enable);
+
+/*
+ * All mpam error interrupts indicate a software bug. On receipt, disable the
+ * driver.
+ */
+static DECLARE_WORK(mpam_broken_work, &mpam_disable);
+
+/* When mpam is disabled, the printed reason to aid debugging */
+static char *mpam_disable_reason;
+
+/*
+ * An MSC is a physical container for controls and monitors, each identified by
+ * their RIS index. These share a base-address, interrupts and some MMIO
+ * registers. A vMSC is a virtual container for RIS in an MSC that control or
+ * monitor the same thing. Members of a vMSC are all RIS in the same MSC, but
+ * not all RIS in an MSC share a vMSC.
+ *
+ * Components are a group of vMSC that control or monitor the same thing but
+ * are from different MSC, so have different base-address, interrupts etc.
+ * Classes are the set components of the same type.
+ *
+ * The features of a vMSC is the union of the RIS it contains.
+ * The features of a Class and Component are the common subset of the vMSC
+ * they contain.
+ *
+ * e.g. The system cache may have bandwidth controls on multiple interfaces,
+ * for regulating traffic from devices independently of traffic from CPUs.
+ * If these are two RIS in one MSC, they will be treated as controlling
+ * different things, and will not share a vMSC/component/class.
+ *
+ * e.g. The L2 may have one MSC and two RIS, one for cache-controls another
+ * for bandwidth. These two RIS are members of the same vMSC.
+ *
+ * e.g. The set of RIS that make up the L2 are grouped as a component. These
+ * are sometimes termed slices. They should be configured the same, as if there
+ * were only one.
+ *
+ * e.g. The SoC probably has more than one L2, each attached to a distinct set
+ * of CPUs. All the L2 components are grouped as a class.
+ *
+ * When creating an MSC, struct mpam_msc is added to the all mpam_all_msc list,
+ * then linked via struct mpam_ris to a vmsc, component and class.
+ * The same MSC may exist under different class->component->vmsc paths, but the
+ * RIS index will be unique.
+ */
+LIST_HEAD(mpam_classes);
+
+/* List of all objects that can be free()d after synchronise_srcu() */
+static LLIST_HEAD(mpam_garbage);
+
+static inline void init_garbage(struct mpam_garbage *garbage)
+{
+	init_llist_node(&garbage->llist);
+}
+
+#define add_to_garbage(x)				\
+do {							\
+	__typeof__(x) _x = (x);				\
+	_x->garbage.to_free = _x;			\
+	llist_add(&_x->garbage.llist, &mpam_garbage);	\
+} while (0)
+
+static void mpam_free_garbage(void)
+{
+	struct mpam_garbage *iter, *tmp;
+	struct llist_node *to_free = llist_del_all(&mpam_garbage);
+
+	if (!to_free)
+		return;
+
+	synchronize_srcu(&mpam_srcu);
+
+	llist_for_each_entry_safe(iter, tmp, to_free, llist) {
+		if (iter->pdev)
+			devm_kfree(&iter->pdev->dev, iter->to_free);
+		else
+			kfree(iter->to_free);
+	}
+}
+
+/*
+ * Once mpam is enabled, new requestors cannot further reduce the available
+ * partid. Assert that the size is fixed, and new requestors will be turned
+ * away.
+ */
+static void mpam_assert_partid_sizes_fixed(void)
+{
+	WARN_ON_ONCE(!partid_max_published);
+}
+
+static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg)
+{
+	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
+
+	return readl_relaxed(msc->mapped_hwpage + reg);
+}
+
+static inline u32 _mpam_read_partsel_reg(struct mpam_msc *msc, u16 reg)
+{
+	lockdep_assert_held_once(&msc->part_sel_lock);
+	return __mpam_read_reg(msc, reg);
+}
+
+#define mpam_read_partsel_reg(msc, reg) _mpam_read_partsel_reg(msc, MPAMF_##reg)
+
+static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val)
+{
+	WARN_ON_ONCE(reg + sizeof(u32) > msc->mapped_hwpage_sz);
+	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
+
+	writel_relaxed(val, msc->mapped_hwpage + reg);
+}
+
+static inline void _mpam_write_partsel_reg(struct mpam_msc *msc, u16 reg, u32 val)
+{
+	lockdep_assert_held_once(&msc->part_sel_lock);
+	__mpam_write_reg(msc, reg, val);
+}
+
+#define mpam_write_partsel_reg(msc, reg, val)  _mpam_write_partsel_reg(msc, MPAMCFG_##reg, val)
+
+static inline u32 _mpam_read_monsel_reg(struct mpam_msc *msc, u16 reg)
+{
+	mpam_mon_sel_lock_held(msc);
+	return __mpam_read_reg(msc, reg);
+}
+
+#define mpam_read_monsel_reg(msc, reg) _mpam_read_monsel_reg(msc, MSMON_##reg)
+
+static inline void _mpam_write_monsel_reg(struct mpam_msc *msc, u16 reg, u32 val)
+{
+	mpam_mon_sel_lock_held(msc);
+	__mpam_write_reg(msc, reg, val);
+}
+
+#define mpam_write_monsel_reg(msc, reg, val)   _mpam_write_monsel_reg(msc, MSMON_##reg, val)
+
+static u64 mpam_msc_read_idr(struct mpam_msc *msc)
+{
+	u64 idr_high = 0, idr_low;
+
+	lockdep_assert_held(&msc->part_sel_lock);
+
+	idr_low = mpam_read_partsel_reg(msc, IDR);
+	if (FIELD_GET(MPAMF_IDR_EXT, idr_low))
+		idr_high = mpam_read_partsel_reg(msc, IDR + 4);
+
+	return (idr_high << 32) | idr_low;
+}
+
+static void mpam_msc_clear_esr(struct mpam_msc *msc)
+{
+	u64 esr_low = __mpam_read_reg(msc, MPAMF_ESR);
+
+	if (!esr_low)
+		return;
+
+	/*
+	 * Clearing the high/low bits of MPAMF_ESR can not be atomic.
+	 * Clear the top half first, so that the pending error bits in the
+	 * lower half prevent hardware from updating either half of the
+	 * register.
+	 */
+	if (msc->has_extd_esr)
+		__mpam_write_reg(msc, MPAMF_ESR + 4, 0);
+	__mpam_write_reg(msc, MPAMF_ESR, 0);
+}
+
+static u64 mpam_msc_read_esr(struct mpam_msc *msc)
+{
+	u64 esr_high = 0, esr_low;
+
+	esr_low = __mpam_read_reg(msc, MPAMF_ESR);
+	if (msc->has_extd_esr)
+		esr_high = __mpam_read_reg(msc, MPAMF_ESR + 4);
+
+	return (esr_high << 32) | esr_low;
+}
+
+static void __mpam_part_sel_raw(u32 partsel, struct mpam_msc *msc)
+{
+	lockdep_assert_held(&msc->part_sel_lock);
+
+	mpam_write_partsel_reg(msc, PART_SEL, partsel);
+}
+
+static void __mpam_part_sel(u8 ris_idx, u16 partid, struct mpam_msc *msc)
+{
+	u32 partsel = FIELD_PREP(MPAMCFG_PART_SEL_RIS, ris_idx) |
+		      FIELD_PREP(MPAMCFG_PART_SEL_PARTID_SEL, partid);
+
+	__mpam_part_sel_raw(partsel, msc);
+}
+
+static void __mpam_intpart_sel(u8 ris_idx, u16 intpartid, struct mpam_msc *msc)
+{
+	u32 partsel = FIELD_PREP(MPAMCFG_PART_SEL_RIS, ris_idx) |
+		      FIELD_PREP(MPAMCFG_PART_SEL_PARTID_SEL, intpartid) |
+		      MPAMCFG_PART_SEL_INTERNAL;
+
+	__mpam_part_sel_raw(partsel, msc);
+}
+
+int mpam_register_requestor(u16 partid_max, u8 pmg_max)
+{
+	guard(spinlock)(&partid_max_lock);
+	if (!partid_max_init) {
+		mpam_partid_max = partid_max;
+		mpam_pmg_max = pmg_max;
+		partid_max_init = true;
+	} else if (!partid_max_published) {
+		mpam_partid_max = min(mpam_partid_max, partid_max);
+		mpam_pmg_max = min(mpam_pmg_max, pmg_max);
+	} else {
+		/* New requestors can't lower the values */
+		if (partid_max < mpam_partid_max || pmg_max < mpam_pmg_max)
+			return -EBUSY;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mpam_register_requestor);
+
+static struct mpam_class *
+mpam_class_alloc(u8 level_idx, enum mpam_class_types type)
+{
+	struct mpam_class *class;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	class = kzalloc(sizeof(*class), GFP_KERNEL);
+	if (!class)
+		return ERR_PTR(-ENOMEM);
+	init_garbage(&class->garbage);
+
+	INIT_LIST_HEAD_RCU(&class->components);
+	/* Affinity is updated when ris are added */
+	class->level = level_idx;
+	class->type = type;
+	INIT_LIST_HEAD_RCU(&class->classes_list);
+	ida_init(&class->ida_csu_mon);
+	ida_init(&class->ida_mbwu_mon);
+
+	list_add_rcu(&class->classes_list, &mpam_classes);
+
+	return class;
+}
+
+static void mpam_class_destroy(struct mpam_class *class)
+{
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_del_rcu(&class->classes_list);
+	add_to_garbage(class);
+}
+
+static struct mpam_class *
+mpam_class_find(u8 level_idx, enum mpam_class_types type)
+{
+	struct mpam_class *class;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_for_each_entry(class, &mpam_classes, classes_list) {
+		if (class->type == type && class->level == level_idx)
+			return class;
+	}
+
+	return mpam_class_alloc(level_idx, type);
+}
+
+static struct mpam_component *
+mpam_component_alloc(struct mpam_class *class, int id)
+{
+	struct mpam_component *comp;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	comp = kzalloc(sizeof(*comp), GFP_KERNEL);
+	if (!comp)
+		return ERR_PTR(-ENOMEM);
+	init_garbage(&comp->garbage);
+
+	comp->comp_id = id;
+	INIT_LIST_HEAD_RCU(&comp->vmsc);
+	/* Affinity is updated when RIS are added */
+	INIT_LIST_HEAD_RCU(&comp->class_list);
+	comp->class = class;
+
+	list_add_rcu(&comp->class_list, &class->components);
+
+	return comp;
+}
+
+static void __destroy_component_cfg(struct mpam_component *comp);
+
+static void mpam_component_destroy(struct mpam_component *comp)
+{
+	struct mpam_class *class = comp->class;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	__destroy_component_cfg(comp);
+
+	list_del_rcu(&comp->class_list);
+	add_to_garbage(comp);
+
+	if (list_empty(&class->components))
+		mpam_class_destroy(class);
+}
+
+static struct mpam_component *
+mpam_component_find(struct mpam_class *class, int id)
+{
+	struct mpam_component *comp;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_for_each_entry(comp, &class->components, class_list) {
+		if (comp->comp_id == id)
+			return comp;
+	}
+
+	return mpam_component_alloc(class, id);
+}
+
+static struct mpam_vmsc *
+mpam_vmsc_alloc(struct mpam_component *comp, struct mpam_msc *msc)
+{
+	struct mpam_vmsc *vmsc;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	vmsc = kzalloc(sizeof(*vmsc), GFP_KERNEL);
+	if (!vmsc)
+		return ERR_PTR(-ENOMEM);
+	init_garbage(&vmsc->garbage);
+
+	INIT_LIST_HEAD_RCU(&vmsc->ris);
+	INIT_LIST_HEAD_RCU(&vmsc->comp_list);
+	vmsc->comp = comp;
+	vmsc->msc = msc;
+
+	list_add_rcu(&vmsc->comp_list, &comp->vmsc);
+
+	return vmsc;
+}
+
+static void mpam_vmsc_destroy(struct mpam_vmsc *vmsc)
+{
+	struct mpam_component *comp = vmsc->comp;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_del_rcu(&vmsc->comp_list);
+	add_to_garbage(vmsc);
+
+	if (list_empty(&comp->vmsc))
+		mpam_component_destroy(comp);
+}
+
+static struct mpam_vmsc *
+mpam_vmsc_find(struct mpam_component *comp, struct mpam_msc *msc)
+{
+	struct mpam_vmsc *vmsc;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_for_each_entry(vmsc, &comp->vmsc, comp_list) {
+		if (vmsc->msc->id == msc->id)
+			return vmsc;
+	}
+
+	return mpam_vmsc_alloc(comp, msc);
+}
+
+/*
+ * The cacheinfo structures are only populated when CPUs are online.
+ * This helper walks the acpi tables to include offline CPUs too.
+ */
+int mpam_get_cpumask_from_cache_id(unsigned long cache_id, u32 cache_level,
+				   cpumask_t *affinity)
+{
+	return acpi_pptt_get_cpumask_from_cache_id(cache_id, affinity);
+}
+
+/*
+ * cpumask_of_node() only knows about online CPUs. This can't tell us whether
+ * a class is represented on all possible CPUs.
+ */
+static void get_cpumask_from_node_id(u32 node_id, cpumask_t *affinity)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		if (node_id == cpu_to_node(cpu))
+			cpumask_set_cpu(cpu, affinity);
+	}
+}
+
+static int mpam_ris_get_affinity(struct mpam_msc *msc, cpumask_t *affinity,
+				 enum mpam_class_types type,
+				 struct mpam_class *class,
+				 struct mpam_component *comp)
+{
+	int err;
+
+	switch (type) {
+	case MPAM_CLASS_CACHE:
+		err = mpam_get_cpumask_from_cache_id(comp->comp_id, class->level,
+						     affinity);
+		if (err) {
+			dev_warn_once(&msc->pdev->dev,
+				      "Failed to determine CPU affinity\n");
+			return err;
+		}
+
+		if (cpumask_empty(affinity))
+			dev_warn_once(&msc->pdev->dev, "no CPUs associated with cache node\n");
+
+		break;
+	case MPAM_CLASS_MEMORY:
+		get_cpumask_from_node_id(comp->comp_id, affinity);
+		/* affinity may be empty for CPU-less memory nodes */
+		break;
+	case MPAM_CLASS_UNKNOWN:
+		return 0;
+	}
+
+	cpumask_and(affinity, affinity, &msc->accessibility);
+
+	return 0;
+}
+
+static int mpam_ris_create_locked(struct mpam_msc *msc, u8 ris_idx,
+				  enum mpam_class_types type, u8 class_id,
+				  int component_id)
+{
+	int err;
+	struct mpam_vmsc *vmsc;
+	struct mpam_msc_ris *ris;
+	struct mpam_class *class;
+	struct mpam_component *comp;
+	struct platform_device *pdev = msc->pdev;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	if (ris_idx > MPAM_MSC_MAX_NUM_RIS)
+		return -EINVAL;
+
+	if (test_and_set_bit(ris_idx, &msc->ris_idxs))
+		return -EBUSY;
+
+	ris = devm_kzalloc(&msc->pdev->dev, sizeof(*ris), GFP_KERNEL);
+	if (!ris)
+		return -ENOMEM;
+	init_garbage(&ris->garbage);
+	ris->garbage.pdev = pdev;
+
+	class = mpam_class_find(class_id, type);
+	if (IS_ERR(class))
+		return PTR_ERR(class);
+
+	comp = mpam_component_find(class, component_id);
+	if (IS_ERR(comp)) {
+		if (list_empty(&class->components))
+			mpam_class_destroy(class);
+		return PTR_ERR(comp);
+	}
+
+	vmsc = mpam_vmsc_find(comp, msc);
+	if (IS_ERR(vmsc)) {
+		if (list_empty(&comp->vmsc))
+			mpam_component_destroy(comp);
+		return PTR_ERR(vmsc);
+	}
+
+	err = mpam_ris_get_affinity(msc, &ris->affinity, type, class, comp);
+	if (err) {
+		if (list_empty(&vmsc->ris))
+			mpam_vmsc_destroy(vmsc);
+		return err;
+	}
+
+	ris->ris_idx = ris_idx;
+	INIT_LIST_HEAD_RCU(&ris->msc_list);
+	INIT_LIST_HEAD_RCU(&ris->vmsc_list);
+	ris->vmsc = vmsc;
+
+	cpumask_or(&comp->affinity, &comp->affinity, &ris->affinity);
+	cpumask_or(&class->affinity, &class->affinity, &ris->affinity);
+	list_add_rcu(&ris->vmsc_list, &vmsc->ris);
+	list_add_rcu(&ris->msc_list, &msc->ris);
+
+	return 0;
+}
+
+static void mpam_ris_destroy(struct mpam_msc_ris *ris)
+{
+	struct mpam_vmsc *vmsc = ris->vmsc;
+	struct mpam_msc *msc = vmsc->msc;
+	struct mpam_component *comp = vmsc->comp;
+	struct mpam_class *class = comp->class;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	/*
+	 * It is assumed affinities don't overlap. If they do the class becomes
+	 * unusable immediately.
+	 */
+	cpumask_andnot(&class->affinity, &class->affinity, &ris->affinity);
+	cpumask_andnot(&comp->affinity, &comp->affinity, &ris->affinity);
+	clear_bit(ris->ris_idx, &msc->ris_idxs);
+	list_del_rcu(&ris->msc_list);
+	list_del_rcu(&ris->vmsc_list);
+	add_to_garbage(ris);
+
+	if (list_empty(&vmsc->ris))
+		mpam_vmsc_destroy(vmsc);
+}
+
+int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
+		    enum mpam_class_types type, u8 class_id, int component_id)
+{
+	int err;
+
+	mutex_lock(&mpam_list_lock);
+	err = mpam_ris_create_locked(msc, ris_idx, type, class_id,
+				     component_id);
+	mutex_unlock(&mpam_list_lock);
+	if (err)
+		mpam_free_garbage();
+
+	return err;
+}
+
+static struct mpam_msc_ris *mpam_get_or_create_ris(struct mpam_msc *msc,
+						   u8 ris_idx)
+{
+	int err;
+	struct mpam_msc_ris *ris;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	if (!test_bit(ris_idx, &msc->ris_idxs)) {
+		err = mpam_ris_create_locked(msc, ris_idx, MPAM_CLASS_UNKNOWN,
+					     0, 0);
+		if (err)
+			return ERR_PTR(err);
+	}
+
+	list_for_each_entry(ris, &msc->ris, msc_list) {
+		if (ris->ris_idx == ris_idx)
+			return ris;
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+
+/*
+ * IHI009A.a has this nugget: "If a monitor does not support automatic behaviour
+ * of NRDY, software can use this bit for any purpose" - so hardware might not
+ * implement this - but it isn't RES0.
+ *
+ * Try and see what values stick in this bit. If we can write either value,
+ * its probably not implemented by hardware.
+ */
+static bool _mpam_ris_hw_probe_hw_nrdy(struct mpam_msc_ris *ris, u32 mon_reg)
+{
+	u32 now;
+	u64 mon_sel;
+	bool can_set, can_clear;
+	struct mpam_msc *msc = ris->vmsc->msc;
+
+	if (WARN_ON_ONCE(!mpam_mon_sel_lock(msc)))
+		return false;
+
+	mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, 0) |
+		  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
+	_mpam_write_monsel_reg(msc, mon_reg, mon_sel);
+
+	_mpam_write_monsel_reg(msc, mon_reg, MSMON___NRDY);
+	now = _mpam_read_monsel_reg(msc, mon_reg);
+	can_set = now & MSMON___NRDY;
+
+	_mpam_write_monsel_reg(msc, mon_reg, 0);
+	now = _mpam_read_monsel_reg(msc, mon_reg);
+	can_clear = !(now & MSMON___NRDY);
+	mpam_mon_sel_unlock(msc);
+
+	return (!can_set || !can_clear);
+}
+
+#define mpam_ris_hw_probe_hw_nrdy(_ris, _mon_reg)			\
+	_mpam_ris_hw_probe_hw_nrdy(_ris, MSMON_##_mon_reg)
+
+static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
+{
+	int err;
+	struct mpam_msc *msc = ris->vmsc->msc;
+	struct device *dev = &msc->pdev->dev;
+	struct mpam_props *props = &ris->props;
+	struct mpam_class *class = ris->vmsc->comp->class;
+
+	lockdep_assert_held(&msc->probe_lock);
+	lockdep_assert_held(&msc->part_sel_lock);
+
+	/* Cache Capacity Partitioning */
+	if (FIELD_GET(MPAMF_IDR_HAS_CCAP_PART, ris->idr)) {
+		u32 ccap_features = mpam_read_partsel_reg(msc, CCAP_IDR);
+
+		props->cmax_wd = FIELD_GET(MPAMF_CCAP_IDR_CMAX_WD, ccap_features);
+		if (props->cmax_wd &&
+		    FIELD_GET(MPAMF_CCAP_IDR_HAS_CMAX_SOFTLIM, ccap_features))
+			mpam_set_feature(mpam_feat_cmax_softlim, props);
+
+		if (props->cmax_wd &&
+		    !FIELD_GET(MPAMF_CCAP_IDR_NO_CMAX, ccap_features))
+			mpam_set_feature(mpam_feat_cmax_cmax, props);
+
+		if (props->cmax_wd &&
+		    FIELD_GET(MPAMF_CCAP_IDR_HAS_CMIN, ccap_features))
+			mpam_set_feature(mpam_feat_cmax_cmin, props);
+
+		props->cassoc_wd = FIELD_GET(MPAMF_CCAP_IDR_CASSOC_WD, ccap_features);
+		if (props->cassoc_wd &&
+		    FIELD_GET(MPAMF_CCAP_IDR_HAS_CASSOC, ccap_features))
+			mpam_set_feature(mpam_feat_cmax_cassoc, props);
+	}
+
+	/* Cache Portion partitioning */
+	if (FIELD_GET(MPAMF_IDR_HAS_CPOR_PART, ris->idr)) {
+		u32 cpor_features = mpam_read_partsel_reg(msc, CPOR_IDR);
+
+		props->cpbm_wd = FIELD_GET(MPAMF_CPOR_IDR_CPBM_WD, cpor_features);
+		if (props->cpbm_wd)
+			mpam_set_feature(mpam_feat_cpor_part, props);
+	}
+
+	/* Memory bandwidth partitioning */
+	if (FIELD_GET(MPAMF_IDR_HAS_MBW_PART, ris->idr)) {
+		u32 mbw_features = mpam_read_partsel_reg(msc, MBW_IDR);
+
+		/* portion bitmap resolution */
+		props->mbw_pbm_bits = FIELD_GET(MPAMF_MBW_IDR_BWPBM_WD, mbw_features);
+		if (props->mbw_pbm_bits &&
+		    FIELD_GET(MPAMF_MBW_IDR_HAS_PBM, mbw_features))
+			mpam_set_feature(mpam_feat_mbw_part, props);
+
+		props->bwa_wd = FIELD_GET(MPAMF_MBW_IDR_BWA_WD, mbw_features);
+		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features))
+			mpam_set_feature(mpam_feat_mbw_max, props);
+
+		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MIN, mbw_features))
+			mpam_set_feature(mpam_feat_mbw_min, props);
+
+		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_PROP, mbw_features))
+			mpam_set_feature(mpam_feat_mbw_prop, props);
+	}
+
+	/* Priority partitioning */
+	if (FIELD_GET(MPAMF_IDR_HAS_PRI_PART, ris->idr)) {
+		u32 pri_features = mpam_read_partsel_reg(msc, PRI_IDR);
+
+		props->intpri_wd = FIELD_GET(MPAMF_PRI_IDR_INTPRI_WD, pri_features);
+		if (props->intpri_wd && FIELD_GET(MPAMF_PRI_IDR_HAS_INTPRI, pri_features)) {
+			mpam_set_feature(mpam_feat_intpri_part, props);
+			if (FIELD_GET(MPAMF_PRI_IDR_INTPRI_0_IS_LOW, pri_features))
+				mpam_set_feature(mpam_feat_intpri_part_0_low, props);
+		}
+
+		props->dspri_wd = FIELD_GET(MPAMF_PRI_IDR_DSPRI_WD, pri_features);
+		if (props->dspri_wd && FIELD_GET(MPAMF_PRI_IDR_HAS_DSPRI, pri_features)) {
+			mpam_set_feature(mpam_feat_dspri_part, props);
+			if (FIELD_GET(MPAMF_PRI_IDR_DSPRI_0_IS_LOW, pri_features))
+				mpam_set_feature(mpam_feat_dspri_part_0_low, props);
+		}
+	}
+
+	/* Performance Monitoring */
+	if (FIELD_GET(MPAMF_IDR_HAS_MSMON, ris->idr)) {
+		u32 msmon_features = mpam_read_partsel_reg(msc, MSMON_IDR);
+
+		/*
+		 * If the firmware max-nrdy-us property is missing, the
+		 * CSU counters can't be used. Should we wait forever?
+		 */
+		err = device_property_read_u32(&msc->pdev->dev,
+					       "arm,not-ready-us",
+					       &msc->nrdy_usec);
+
+		if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_CSU, msmon_features)) {
+			u32 csumonidr;
+
+			csumonidr = mpam_read_partsel_reg(msc, CSUMON_IDR);
+			props->num_csu_mon = FIELD_GET(MPAMF_CSUMON_IDR_NUM_MON, csumonidr);
+			if (props->num_csu_mon) {
+				bool hw_managed;
+
+				mpam_set_feature(mpam_feat_msmon_csu, props);
+
+				if (FIELD_GET(MPAMF_CSUMON_IDR_HAS_XCL, csumonidr))
+					mpam_set_feature(mpam_feat_msmon_csu_xcl, props);
+
+				/* Is NRDY hardware managed? */
+				hw_managed = mpam_ris_hw_probe_hw_nrdy(ris, CSU);
+				if (hw_managed)
+					mpam_set_feature(mpam_feat_msmon_csu_hw_nrdy, props);
+			}
+
+			/*
+			 * Accept the missing firmware property if NRDY appears
+			 * un-implemented.
+			 */
+			if (err && mpam_has_feature(mpam_feat_msmon_csu_hw_nrdy, props))
+				dev_err_once(dev, "Counters are not usable because not-ready timeout was not provided by firmware.");
+		}
+		if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_MBWU, msmon_features)) {
+			bool has_long, hw_managed;
+			u32 mbwumon_idr = mpam_read_partsel_reg(msc, MBWUMON_IDR);
+
+			props->num_mbwu_mon = FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumon_idr);
+			if (props->num_mbwu_mon) {
+				mpam_set_feature(mpam_feat_msmon_mbwu, props);
+
+				if (FIELD_GET(MPAMF_MBWUMON_IDR_HAS_RWBW, mbwumon_idr))
+					mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props);
+
+				has_long = FIELD_GET(MPAMF_MBWUMON_IDR_HAS_LONG, mbwumon_idr);
+				if (has_long) {
+					if (FIELD_GET(MPAMF_MBWUMON_IDR_LWD, mbwumon_idr))
+						mpam_set_feature(mpam_feat_msmon_mbwu_63counter, props);
+					else
+						mpam_set_feature(mpam_feat_msmon_mbwu_44counter, props);
+				} else {
+					mpam_set_feature(mpam_feat_msmon_mbwu_31counter, props);
+				}
+
+				/* Is NRDY hardware managed? */
+				hw_managed = mpam_ris_hw_probe_hw_nrdy(ris, MBWU);
+				if (hw_managed)
+					mpam_set_feature(mpam_feat_msmon_mbwu_hw_nrdy, props);
+
+				/*
+				 * Don't warn about any missing firmware property for
+				 * MBWU NRDY - it doesn't make any sense!
+				 */
+			}
+		}
+	}
+
+	/*
+	 * RIS with PARTID narrowing don't have enough storage for one
+	 * configuration per PARTID. If these are in a class we could use,
+	 * reduce the supported partid_max to match the number of intpartid.
+	 * If the class is unknown, just ignore it.
+	 */
+	if (FIELD_GET(MPAMF_IDR_HAS_PARTID_NRW, ris->idr) &&
+	    class->type != MPAM_CLASS_UNKNOWN) {
+		u32 nrwidr = mpam_read_partsel_reg(msc, PARTID_NRW_IDR);
+		u16 partid_max = FIELD_GET(MPAMF_PARTID_NRW_IDR_INTPARTID_MAX, nrwidr);
+
+		mpam_set_feature(mpam_feat_partid_nrw, props);
+		msc->partid_max = min(msc->partid_max, partid_max);
+	}
+}
+
+static int mpam_msc_hw_probe(struct mpam_msc *msc)
+{
+	u64 idr;
+	u16 partid_max;
+	u8 ris_idx, pmg_max;
+	struct mpam_msc_ris *ris;
+	struct device *dev = &msc->pdev->dev;
+
+	lockdep_assert_held(&msc->probe_lock);
+
+	idr = __mpam_read_reg(msc, MPAMF_AIDR);
+	if ((idr & MPAMF_AIDR_ARCH_MAJOR_REV) != MPAM_ARCHITECTURE_V1) {
+		dev_err_once(dev, "MSC does not match MPAM architecture v1.x\n");
+		return -EIO;
+	}
+
+	/* Grab an IDR value to find out how many RIS there are */
+	mutex_lock(&msc->part_sel_lock);
+	idr = mpam_msc_read_idr(msc);
+	mutex_unlock(&msc->part_sel_lock);
+
+	msc->ris_max = FIELD_GET(MPAMF_IDR_RIS_MAX, idr);
+
+	/* Use these values so partid/pmg always starts with a valid value */
+	msc->partid_max = FIELD_GET(MPAMF_IDR_PARTID_MAX, idr);
+	msc->pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr);
+
+	for (ris_idx = 0; ris_idx <= msc->ris_max; ris_idx++) {
+		mutex_lock(&msc->part_sel_lock);
+		__mpam_part_sel(ris_idx, 0, msc);
+		idr = mpam_msc_read_idr(msc);
+		mutex_unlock(&msc->part_sel_lock);
+
+		partid_max = FIELD_GET(MPAMF_IDR_PARTID_MAX, idr);
+		pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr);
+		msc->partid_max = min(msc->partid_max, partid_max);
+		msc->pmg_max = min(msc->pmg_max, pmg_max);
+		msc->has_extd_esr = FIELD_GET(MPAMF_IDR_HAS_EXTD_ESR, idr);
+
+		mutex_lock(&mpam_list_lock);
+		ris = mpam_get_or_create_ris(msc, ris_idx);
+		mutex_unlock(&mpam_list_lock);
+		if (IS_ERR(ris))
+			return PTR_ERR(ris);
+		ris->idr = idr;
+
+		mutex_lock(&msc->part_sel_lock);
+		__mpam_part_sel(ris_idx, 0, msc);
+		mpam_ris_hw_probe(ris);
+		mutex_unlock(&msc->part_sel_lock);
+	}
+
+	/* Clear any stale errors */
+	mpam_msc_clear_esr(msc);
+
+	spin_lock(&partid_max_lock);
+	mpam_partid_max = min(mpam_partid_max, msc->partid_max);
+	mpam_pmg_max = min(mpam_pmg_max, msc->pmg_max);
+	spin_unlock(&partid_max_lock);
+
+	msc->probed = true;
+
+	return 0;
+}
+
+struct mon_read {
+	struct mpam_msc_ris		*ris;
+	struct mon_cfg			*ctx;
+	enum mpam_device_features	type;
+	u64				*val;
+	int				err;
+};
+
+static bool mpam_ris_has_mbwu_long_counter(struct mpam_msc_ris *ris)
+{
+	return (mpam_has_feature(mpam_feat_msmon_mbwu_63counter, &ris->props) ||
+		mpam_has_feature(mpam_feat_msmon_mbwu_44counter, &ris->props));
+}
+
+static u64 mpam_msc_read_mbwu_l(struct mpam_msc *msc)
+{
+	int retry = 3;
+	u32 mbwu_l_low;
+	u64 mbwu_l_high1, mbwu_l_high2;
+
+	mpam_mon_sel_lock_held(msc);
+
+	WARN_ON_ONCE((MSMON_MBWU_L + sizeof(u64)) > msc->mapped_hwpage_sz);
+	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
+
+	mbwu_l_high2 = __mpam_read_reg(msc, MSMON_MBWU_L + 4);
+	do {
+		mbwu_l_high1 = mbwu_l_high2;
+		mbwu_l_low = __mpam_read_reg(msc, MSMON_MBWU_L);
+		mbwu_l_high2 = __mpam_read_reg(msc, MSMON_MBWU_L + 4);
+
+		retry--;
+	} while (mbwu_l_high1 != mbwu_l_high2 && retry > 0);
+
+	if (mbwu_l_high1 == mbwu_l_high2)
+		return (mbwu_l_high1 << 32) | mbwu_l_low;
+
+	pr_warn("Failed to read a stable value\n");
+	return MSMON___L_NRDY;
+}
+
+static void mpam_msc_zero_mbwu_l(struct mpam_msc *msc)
+{
+	mpam_mon_sel_lock_held(msc);
+
+	WARN_ON_ONCE((MSMON_MBWU_L + sizeof(u64)) > msc->mapped_hwpage_sz);
+	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
+
+	__mpam_write_reg(msc, MSMON_MBWU_L, 0);
+	__mpam_write_reg(msc, MSMON_MBWU_L + 4, 0);
+}
+
+static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val,
+				   u32 *flt_val)
+{
+	struct mon_cfg *ctx = m->ctx;
+
+	/*
+	 * For CSU counters its implementation-defined what happens when not
+	 * filtering by partid.
+	 */
+	*ctl_val = MSMON_CFG_x_CTL_MATCH_PARTID;
+
+	*flt_val = FIELD_PREP(MSMON_CFG_x_FLT_PARTID, ctx->partid);
+
+	if (m->ctx->match_pmg) {
+		*ctl_val |= MSMON_CFG_x_CTL_MATCH_PMG;
+		*flt_val |= FIELD_PREP(MSMON_CFG_x_FLT_PMG, ctx->pmg);
+	}
+
+	switch (m->type) {
+	case mpam_feat_msmon_csu:
+		*ctl_val |= MSMON_CFG_CSU_CTL_TYPE_CSU;
+
+		if (mpam_has_feature(mpam_feat_msmon_csu_xcl, &m->ris->props))
+			*flt_val |= FIELD_PREP(MSMON_CFG_CSU_FLT_XCL, ctx->csu_exclude_clean);
+
+		break;
+	case mpam_feat_msmon_mbwu_31counter:
+	case mpam_feat_msmon_mbwu_44counter:
+	case mpam_feat_msmon_mbwu_63counter:
+		*ctl_val |= MSMON_CFG_MBWU_CTL_TYPE_MBWU;
+
+		if (mpam_has_feature(mpam_feat_msmon_mbwu_rwbw, &m->ris->props))
+			*flt_val |= FIELD_PREP(MSMON_CFG_MBWU_FLT_RWBW, ctx->opts);
+
+		break;
+	default:
+		pr_warn("Unexpected monitor type %d\n", m->type);
+	}
+}
+
+static void read_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val,
+				    u32 *flt_val)
+{
+	struct mpam_msc *msc = m->ris->vmsc->msc;
+
+	switch (m->type) {
+	case mpam_feat_msmon_csu:
+		*ctl_val = mpam_read_monsel_reg(msc, CFG_CSU_CTL);
+		*flt_val = mpam_read_monsel_reg(msc, CFG_CSU_FLT);
+		break;
+	case mpam_feat_msmon_mbwu_31counter:
+	case mpam_feat_msmon_mbwu_44counter:
+	case mpam_feat_msmon_mbwu_63counter:
+		*ctl_val = mpam_read_monsel_reg(msc, CFG_MBWU_CTL);
+		*flt_val = mpam_read_monsel_reg(msc, CFG_MBWU_FLT);
+		break;
+	default:
+		pr_warn("Unexpected monitor type %d\n", m->type);
+	}
+}
+
+/* Remove values set by the hardware to prevent apparent mismatches. */
+static inline void clean_msmon_ctl_val(u32 *cur_ctl)
+{
+	*cur_ctl &= ~MSMON_CFG_x_CTL_OFLOW_STATUS;
+
+	if (FIELD_GET(MSMON_CFG_x_CTL_TYPE, *cur_ctl) == MSMON_CFG_MBWU_CTL_TYPE_MBWU)
+		*cur_ctl &= ~MSMON_CFG_MBWU_CTL_OFLOW_STATUS_L;
+}
+
+static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val,
+				     u32 flt_val)
+{
+	struct mpam_msc *msc = m->ris->vmsc->msc;
+
+	/*
+	 * Write the ctl_val with the enable bit cleared, reset the counter,
+	 * then enable counter.
+	 */
+	switch (m->type) {
+	case mpam_feat_msmon_csu:
+		mpam_write_monsel_reg(msc, CFG_CSU_FLT, flt_val);
+		mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val);
+		mpam_write_monsel_reg(msc, CSU, 0);
+		mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val | MSMON_CFG_x_CTL_EN);
+		break;
+	case mpam_feat_msmon_mbwu_31counter:
+	case mpam_feat_msmon_mbwu_44counter:
+	case mpam_feat_msmon_mbwu_63counter:
+		mpam_write_monsel_reg(msc, CFG_MBWU_FLT, flt_val);
+		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val);
+		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val | MSMON_CFG_x_CTL_EN);
+		/* Counting monitors require NRDY to be reset by software */
+		if (m->type == mpam_feat_msmon_mbwu_31counter)
+			mpam_write_monsel_reg(msc, MBWU, 0);
+		else
+			mpam_msc_zero_mbwu_l(m->ris->vmsc->msc);
+		break;
+	default:
+		pr_warn("Unexpected monitor type %d\n", m->type);
+	}
+}
+
+static u64 mpam_msmon_overflow_val(enum mpam_device_features type)
+{
+	/* TODO: implement scaling counters */
+	switch (type) {
+	case mpam_feat_msmon_mbwu_63counter:
+		return BIT_ULL(hweight_long(MSMON___LWD_VALUE));
+	case mpam_feat_msmon_mbwu_44counter:
+		return BIT_ULL(hweight_long(MSMON___L_VALUE));
+	case mpam_feat_msmon_mbwu_31counter:
+		return BIT_ULL(hweight_long(MSMON___VALUE));
+	default:
+		return 0;
+	}
+}
+
+static void __ris_msmon_read(void *arg)
+{
+	u64 now;
+	bool nrdy = false;
+	bool config_mismatch;
+	bool overflow;
+	struct mon_read *m = arg;
+	struct mon_cfg *ctx = m->ctx;
+	bool reset_on_next_read = false;
+	struct mpam_msc_ris *ris = m->ris;
+	struct msmon_mbwu_state *mbwu_state;
+	struct mpam_props *rprops = &ris->props;
+	struct mpam_msc *msc = m->ris->vmsc->msc;
+	u32 mon_sel, ctl_val, flt_val, cur_ctl, cur_flt;
+
+	if (!mpam_mon_sel_lock(msc)) {
+		m->err = -EIO;
+		return;
+	}
+	mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, ctx->mon) |
+		  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
+	mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
+
+	switch (m->type) {
+	case mpam_feat_msmon_mbwu_31counter:
+	case mpam_feat_msmon_mbwu_44counter:
+	case mpam_feat_msmon_mbwu_63counter:
+		mbwu_state = &ris->mbwu_state[ctx->mon];
+		if (mbwu_state) {
+			reset_on_next_read = mbwu_state->reset_on_next_read;
+			mbwu_state->reset_on_next_read = false;
+		}
+		break;
+	default:
+		break;
+	}
+
+	/*
+	 * Read the existing configuration to avoid re-writing the same values.
+	 * This saves waiting for 'nrdy' on subsequent reads.
+	 */
+	read_msmon_ctl_flt_vals(m, &cur_ctl, &cur_flt);
+
+	if (mpam_feat_msmon_mbwu_31counter == m->type)
+		overflow = cur_ctl & MSMON_CFG_x_CTL_OFLOW_STATUS;
+	else if (mpam_feat_msmon_mbwu_44counter == m->type ||
+		 mpam_feat_msmon_mbwu_63counter == m->type)
+		overflow = cur_ctl & MSMON_CFG_MBWU_CTL_OFLOW_STATUS_L;
+
+	clean_msmon_ctl_val(&cur_ctl);
+	gen_msmon_ctl_flt_vals(m, &ctl_val, &flt_val);
+	config_mismatch = cur_flt != flt_val ||
+			  cur_ctl != (ctl_val | MSMON_CFG_x_CTL_EN);
+
+	if (config_mismatch || reset_on_next_read) {
+		write_msmon_ctl_flt_vals(m, ctl_val, flt_val);
+		overflow = false;
+	} else if (overflow) {
+		mpam_write_monsel_reg(msc, CFG_MBWU_CTL,
+				      cur_ctl &
+				      ~(MSMON_CFG_x_CTL_OFLOW_STATUS |
+					MSMON_CFG_MBWU_CTL_OFLOW_STATUS_L));
+	}
+
+	switch (m->type) {
+	case mpam_feat_msmon_csu:
+		now = mpam_read_monsel_reg(msc, CSU);
+		if (mpam_has_feature(mpam_feat_msmon_csu_hw_nrdy, rprops))
+			nrdy = now & MSMON___NRDY;
+		now = FIELD_GET(MSMON___VALUE, now);
+		break;
+	case mpam_feat_msmon_mbwu_31counter:
+	case mpam_feat_msmon_mbwu_44counter:
+	case mpam_feat_msmon_mbwu_63counter:
+		if (m->type != mpam_feat_msmon_mbwu_31counter) {
+			now = mpam_msc_read_mbwu_l(msc);
+			if (mpam_has_feature(mpam_feat_msmon_mbwu_hw_nrdy, rprops))
+				nrdy = now & MSMON___L_NRDY;
+
+			if (m->type == mpam_feat_msmon_mbwu_63counter)
+				now = FIELD_GET(MSMON___LWD_VALUE, now);
+			else
+				now = FIELD_GET(MSMON___L_VALUE, now);
+		} else {
+			now = mpam_read_monsel_reg(msc, MBWU);
+			if (mpam_has_feature(mpam_feat_msmon_mbwu_hw_nrdy, rprops))
+				nrdy = now & MSMON___NRDY;
+			now = FIELD_GET(MSMON___VALUE, now);
+		}
+
+		if (nrdy)
+			break;
+
+		mbwu_state = &ris->mbwu_state[ctx->mon];
+
+		if (overflow)
+			mbwu_state->correction += mpam_msmon_overflow_val(m->type);
+
+		/*
+		 * Include bandwidth consumed before the last hardware reset and
+		 * a counter size increment for each overflow.
+		 */
+		now += mbwu_state->correction;
+		break;
+	default:
+		m->err = -EINVAL;
+	}
+	mpam_mon_sel_unlock(msc);
+
+	if (nrdy) {
+		m->err = -EBUSY;
+		return;
+	}
+
+	*m->val += now;
+}
+
+static int _msmon_read(struct mpam_component *comp, struct mon_read *arg)
+{
+	int err, any_err = 0;
+	struct mpam_vmsc *vmsc;
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(vmsc, &comp->vmsc, comp_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		struct mpam_msc *msc = vmsc->msc;
+		struct mpam_msc_ris *ris;
+
+		list_for_each_entry_srcu(ris, &vmsc->ris, vmsc_list,
+					 srcu_read_lock_held(&mpam_srcu)) {
+			arg->ris = ris;
+
+			err = smp_call_function_any(&msc->accessibility,
+						    __ris_msmon_read, arg,
+						    true);
+			if (!err && arg->err)
+				err = arg->err;
+
+			/*
+			 * Save one error to be returned to the caller, but
+			 * keep reading counters so that get reprogrammed. On
+			 * platforms with NRDY this lets us wait once.
+			 */
+			if (err)
+				any_err = err;
+		}
+	}
+
+	return any_err;
+}
+
+static enum mpam_device_features mpam_msmon_choose_counter(struct mpam_class *class)
+{
+	struct mpam_props *cprops = &class->props;
+
+	if (mpam_has_feature(mpam_feat_msmon_mbwu_63counter, cprops))
+		return mpam_feat_msmon_mbwu_63counter;
+	if (mpam_has_feature(mpam_feat_msmon_mbwu_44counter, cprops))
+		return mpam_feat_msmon_mbwu_44counter;
+
+	return mpam_feat_msmon_mbwu_31counter;
+}
+
+int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
+		    enum mpam_device_features type, u64 *val)
+{
+	int err;
+	struct mon_read arg;
+	u64 wait_jiffies = 0;
+	struct mpam_class *class = comp->class;
+	struct mpam_props *cprops = &class->props;
+
+	might_sleep();
+
+	if (!mpam_is_enabled())
+		return -EIO;
+
+	if (!mpam_has_feature(type, cprops))
+		return -EOPNOTSUPP;
+
+	if (type == mpam_feat_msmon_mbwu)
+		type = mpam_msmon_choose_counter(class);
+
+	arg = (struct mon_read) {
+		.ctx = ctx,
+		.type = type,
+		.val = val,
+	};
+	*val = 0;
+
+	err = _msmon_read(comp, &arg);
+	if (err == -EBUSY && class->nrdy_usec)
+		wait_jiffies = usecs_to_jiffies(class->nrdy_usec);
+
+	while (wait_jiffies)
+		wait_jiffies = schedule_timeout_uninterruptible(wait_jiffies);
+
+	if (err == -EBUSY) {
+		arg = (struct mon_read) {
+			.ctx = ctx,
+			.type = type,
+			.val = val,
+		};
+		*val = 0;
+
+		err = _msmon_read(comp, &arg);
+	}
+
+	return err;
+}
+
+void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx)
+{
+	struct mpam_msc *msc;
+	struct mpam_vmsc *vmsc;
+	struct mpam_msc_ris *ris;
+
+	if (!mpam_is_enabled())
+		return;
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(vmsc, &comp->vmsc, comp_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		if (!mpam_has_feature(mpam_feat_msmon_mbwu, &vmsc->props))
+			continue;
+
+		msc = vmsc->msc;
+		list_for_each_entry_srcu(ris, &vmsc->ris, vmsc_list,
+					 srcu_read_lock_held(&mpam_srcu)) {
+			if (!mpam_has_feature(mpam_feat_msmon_mbwu, &ris->props))
+				continue;
+
+			if (WARN_ON_ONCE(!mpam_mon_sel_lock(msc)))
+				continue;
+
+			ris->mbwu_state[ctx->mon].correction = 0;
+			ris->mbwu_state[ctx->mon].reset_on_next_read = true;
+			mpam_mon_sel_unlock(msc);
+		}
+	}
+}
+
+static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
+{
+	u32 num_words, msb;
+	u32 bm = ~0;
+	int i;
+
+	lockdep_assert_held(&msc->part_sel_lock);
+
+	if (wd == 0)
+		return;
+
+	/*
+	 * Write all ~0 to all but the last 32bit-word, which may
+	 * have fewer bits...
+	 */
+	num_words = DIV_ROUND_UP(wd, 32);
+	for (i = 0; i < num_words - 1; i++, reg += sizeof(bm))
+		__mpam_write_reg(msc, reg, bm);
+
+	/*
+	 * ....and then the last (maybe) partial 32bit word. When wd is a
+	 * multiple of 32, msb should be 31 to write a full 32bit word.
+	 */
+	msb = (wd - 1) % 32;
+	bm = GENMASK(msb, 0);
+	__mpam_write_reg(msc, reg, bm);
+}
+
+/* Called via IPI. Call while holding an SRCU reference */
+static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
+				      struct mpam_config *cfg)
+{
+	u32 pri_val = 0;
+	u16 cmax = MPAMCFG_CMAX_CMAX;
+	struct mpam_msc *msc = ris->vmsc->msc;
+	struct mpam_props *rprops = &ris->props;
+	u16 dspri = GENMASK(rprops->dspri_wd, 0);
+	u16 intpri = GENMASK(rprops->intpri_wd, 0);
+
+	mutex_lock(&msc->part_sel_lock);
+	__mpam_part_sel(ris->ris_idx, partid, msc);
+
+	if (mpam_has_feature(mpam_feat_partid_nrw, rprops)) {
+		/* Update the intpartid mapping */
+		mpam_write_partsel_reg(msc, INTPARTID,
+				       MPAMCFG_INTPARTID_INTERNAL | partid);
+
+		/*
+		 * Then switch to the 'internal' partid to update the
+		 * configuration.
+		 */
+		__mpam_intpart_sel(ris->ris_idx, partid, msc);
+	}
+
+	if (mpam_has_feature(mpam_feat_cpor_part, rprops) &&
+	    mpam_has_feature(mpam_feat_cpor_part, cfg)) {
+		if (cfg->reset_cpbm)
+			mpam_reset_msc_bitmap(msc, MPAMCFG_CPBM, rprops->cpbm_wd);
+		else
+			mpam_write_partsel_reg(msc, CPBM, cfg->cpbm);
+	}
+
+	if (mpam_has_feature(mpam_feat_mbw_part, rprops) &&
+	    mpam_has_feature(mpam_feat_mbw_part, cfg)) {
+		if (cfg->reset_mbw_pbm)
+			mpam_reset_msc_bitmap(msc, MPAMCFG_MBW_PBM, rprops->mbw_pbm_bits);
+		else
+			mpam_write_partsel_reg(msc, MBW_PBM, cfg->mbw_pbm);
+	}
+
+	if (mpam_has_feature(mpam_feat_mbw_min, rprops) &&
+	    mpam_has_feature(mpam_feat_mbw_min, cfg))
+		mpam_write_partsel_reg(msc, MBW_MIN, 0);
+
+	if (mpam_has_feature(mpam_feat_mbw_max, rprops) &&
+	    mpam_has_feature(mpam_feat_mbw_max, cfg)) {
+		if (cfg->reset_mbw_max)
+			mpam_write_partsel_reg(msc, MBW_MAX, MPAMCFG_MBW_MAX_MAX);
+		else
+			mpam_write_partsel_reg(msc, MBW_MAX, cfg->mbw_max);
+	}
+
+	if (mpam_has_feature(mpam_feat_mbw_prop, rprops) &&
+	    mpam_has_feature(mpam_feat_mbw_prop, cfg))
+		mpam_write_partsel_reg(msc, MBW_PROP, 0);
+
+	if (mpam_has_feature(mpam_feat_cmax_cmax, rprops))
+		mpam_write_partsel_reg(msc, CMAX, cmax);
+
+	if (mpam_has_feature(mpam_feat_cmax_cmin, rprops))
+		mpam_write_partsel_reg(msc, CMIN, 0);
+
+	if (mpam_has_feature(mpam_feat_cmax_cassoc, rprops))
+		mpam_write_partsel_reg(msc, CASSOC, MPAMCFG_CASSOC_CASSOC);
+
+	if (mpam_has_feature(mpam_feat_intpri_part, rprops) ||
+	    mpam_has_feature(mpam_feat_dspri_part, rprops)) {
+		/* aces high? */
+		if (!mpam_has_feature(mpam_feat_intpri_part_0_low, rprops))
+			intpri = 0;
+		if (!mpam_has_feature(mpam_feat_dspri_part_0_low, rprops))
+			dspri = 0;
+
+		if (mpam_has_feature(mpam_feat_intpri_part, rprops))
+			pri_val |= FIELD_PREP(MPAMCFG_PRI_INTPRI, intpri);
+		if (mpam_has_feature(mpam_feat_dspri_part, rprops))
+			pri_val |= FIELD_PREP(MPAMCFG_PRI_DSPRI, dspri);
+
+		mpam_write_partsel_reg(msc, PRI, pri_val);
+	}
+
+	mutex_unlock(&msc->part_sel_lock);
+}
+
+/* Call with msc cfg_lock held */
+static int mpam_restore_mbwu_state(void *_ris)
+{
+	int i;
+	struct mon_read mwbu_arg;
+	struct mpam_msc_ris *ris = _ris;
+	struct mpam_class *class = ris->vmsc->comp->class;
+
+	for (i = 0; i < ris->props.num_mbwu_mon; i++) {
+		if (ris->mbwu_state[i].enabled) {
+			mwbu_arg.ris = ris;
+			mwbu_arg.ctx = &ris->mbwu_state[i].cfg;
+			mwbu_arg.type = mpam_msmon_choose_counter(class);
+
+			__ris_msmon_read(&mwbu_arg);
+		}
+	}
+
+	return 0;
+}
+
+/* Call with MSC cfg_lock held */
+static int mpam_save_mbwu_state(void *arg)
+{
+	int i;
+	u64 val;
+	struct mon_cfg *cfg;
+	u32 cur_flt, cur_ctl, mon_sel;
+	struct mpam_msc_ris *ris = arg;
+	struct msmon_mbwu_state *mbwu_state;
+	struct mpam_msc *msc = ris->vmsc->msc;
+
+	for (i = 0; i < ris->props.num_mbwu_mon; i++) {
+		mbwu_state = &ris->mbwu_state[i];
+		cfg = &mbwu_state->cfg;
+
+		if (WARN_ON_ONCE(!mpam_mon_sel_lock(msc)))
+			return -EIO;
+
+		mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, i) |
+			  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
+		mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
+
+		cur_flt = mpam_read_monsel_reg(msc, CFG_MBWU_FLT);
+		cur_ctl = mpam_read_monsel_reg(msc, CFG_MBWU_CTL);
+		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0);
+
+		if (mpam_ris_has_mbwu_long_counter(ris)) {
+			val = mpam_msc_read_mbwu_l(msc);
+			mpam_msc_zero_mbwu_l(msc);
+		} else {
+			val = mpam_read_monsel_reg(msc, MBWU);
+			mpam_write_monsel_reg(msc, MBWU, 0);
+		}
+
+		cfg->mon = i;
+		cfg->pmg = FIELD_GET(MSMON_CFG_x_FLT_PMG, cur_flt);
+		cfg->match_pmg = FIELD_GET(MSMON_CFG_x_CTL_MATCH_PMG, cur_ctl);
+		cfg->partid = FIELD_GET(MSMON_CFG_x_FLT_PARTID, cur_flt);
+		mbwu_state->correction += val;
+		mbwu_state->enabled = FIELD_GET(MSMON_CFG_x_CTL_EN, cur_ctl);
+		mpam_mon_sel_unlock(msc);
+	}
+
+	return 0;
+}
+
+static void mpam_init_reset_cfg(struct mpam_config *reset_cfg)
+{
+	*reset_cfg = (struct mpam_config) {
+		.reset_cpbm = true,
+		.reset_mbw_pbm = true,
+		.reset_mbw_max = true,
+	};
+	bitmap_fill(reset_cfg->features, MPAM_FEATURE_LAST);
+}
+
+/*
+ * Called via smp_call_on_cpu() to prevent migration, while still being
+ * pre-emptible. Caller must hold mpam_srcu.
+ */
+static int mpam_reset_ris(void *arg)
+{
+	u16 partid, partid_max;
+	struct mpam_config reset_cfg;
+	struct mpam_msc_ris *ris = arg;
+
+	if (ris->in_reset_state)
+		return 0;
+
+	mpam_init_reset_cfg(&reset_cfg);
+
+	spin_lock(&partid_max_lock);
+	partid_max = mpam_partid_max;
+	spin_unlock(&partid_max_lock);
+	for (partid = 0; partid <= partid_max; partid++)
+		mpam_reprogram_ris_partid(ris, partid, &reset_cfg);
+
+	return 0;
+}
+
+/*
+ * Get the preferred CPU for this MSC. If it is accessible from this CPU,
+ * this CPU is preferred. This can be preempted/migrated, it will only result
+ * in more work.
+ */
+static int mpam_get_msc_preferred_cpu(struct mpam_msc *msc)
+{
+	int cpu = raw_smp_processor_id();
+
+	if (cpumask_test_cpu(cpu, &msc->accessibility))
+		return cpu;
+
+	return cpumask_first_and(&msc->accessibility, cpu_online_mask);
+}
+
+static int mpam_touch_msc(struct mpam_msc *msc, int (*fn)(void *a), void *arg)
+{
+	lockdep_assert_irqs_enabled();
+	lockdep_assert_cpus_held();
+	WARN_ON_ONCE(!srcu_read_lock_held((&mpam_srcu)));
+
+	return smp_call_on_cpu(mpam_get_msc_preferred_cpu(msc), fn, arg, true);
+}
+
+struct mpam_write_config_arg {
+	struct mpam_msc_ris *ris;
+	struct mpam_component *comp;
+	u16 partid;
+};
+
+static int __write_config(void *arg)
+{
+	struct mpam_write_config_arg *c = arg;
+
+	mpam_reprogram_ris_partid(c->ris, c->partid, &c->comp->cfg[c->partid]);
+
+	return 0;
+}
+
+static void mpam_reprogram_msc(struct mpam_msc *msc)
+{
+	u16 partid;
+	bool reset;
+	struct mpam_config *cfg;
+	struct mpam_msc_ris *ris;
+	struct mpam_write_config_arg arg;
+
+	/*
+	 * No lock for mpam_partid_max as partid_max_published has been
+	 * set by mpam_enabled(), so the values can no longer change.
+	 */
+	mpam_assert_partid_sizes_fixed();
+
+	mutex_lock(&msc->cfg_lock);
+	list_for_each_entry_srcu(ris, &msc->ris, msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		if (!mpam_is_enabled() && !ris->in_reset_state) {
+			mpam_touch_msc(msc, &mpam_reset_ris, ris);
+			ris->in_reset_state = true;
+			continue;
+		}
+
+		arg.comp = ris->vmsc->comp;
+		arg.ris = ris;
+		reset = true;
+		for (partid = 0; partid <= mpam_partid_max; partid++) {
+			cfg = &ris->vmsc->comp->cfg[partid];
+			if (!bitmap_empty(cfg->features, MPAM_FEATURE_LAST))
+				reset = false;
+
+			arg.partid = partid;
+			mpam_touch_msc(msc, __write_config, &arg);
+		}
+		ris->in_reset_state = reset;
+
+		if (mpam_has_feature(mpam_feat_msmon_mbwu, &ris->props))
+			mpam_touch_msc(msc, &mpam_restore_mbwu_state, ris);
+	}
+	mutex_unlock(&msc->cfg_lock);
+}
+
+static void _enable_percpu_irq(void *_irq)
+{
+	int *irq = _irq;
+
+	enable_percpu_irq(*irq, IRQ_TYPE_NONE);
+}
+
+static int mpam_cpu_online(unsigned int cpu)
+{
+	struct mpam_msc *msc;
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(msc, &mpam_all_msc, all_msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		if (!cpumask_test_cpu(cpu, &msc->accessibility))
+			continue;
+
+		if (msc->reenable_error_ppi)
+			_enable_percpu_irq(&msc->reenable_error_ppi);
+
+		if (atomic_fetch_inc(&msc->online_refs) == 0)
+			mpam_reprogram_msc(msc);
+	}
+
+	return 0;
+}
+
+/* Before mpam is enabled, try to probe new MSC */
+static int mpam_discovery_cpu_online(unsigned int cpu)
+{
+	int err = 0;
+	struct mpam_msc *msc;
+	bool new_device_probed = false;
+
+	if (mpam_is_enabled())
+		return 0;
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(msc, &mpam_all_msc, all_msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		if (!cpumask_test_cpu(cpu, &msc->accessibility))
+			continue;
+
+		mutex_lock(&msc->probe_lock);
+		if (!msc->probed)
+			err = mpam_msc_hw_probe(msc);
+		mutex_unlock(&msc->probe_lock);
+
+		if (err)
+			break;
+		new_device_probed = true;
+	}
+
+	if (new_device_probed && !err)
+		schedule_work(&mpam_enable_work);
+	if (err) {
+		mpam_disable_reason = "error during probing";
+		schedule_work(&mpam_broken_work);
+	}
+
+	return err;
+}
+
+static int mpam_cpu_offline(unsigned int cpu)
+{
+	struct mpam_msc *msc;
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(msc, &mpam_all_msc, all_msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		if (!cpumask_test_cpu(cpu, &msc->accessibility))
+			continue;
+
+		if (msc->reenable_error_ppi)
+			disable_percpu_irq(msc->reenable_error_ppi);
+
+		if (atomic_dec_and_test(&msc->online_refs)) {
+			struct mpam_msc_ris *ris;
+
+			mutex_lock(&msc->cfg_lock);
+			list_for_each_entry_srcu(ris, &msc->ris, msc_list,
+						 srcu_read_lock_held(&mpam_srcu)) {
+				mpam_touch_msc(msc, &mpam_reset_ris, ris);
+
+				/*
+				 * The reset state for non-zero partid may be
+				 * lost while the CPUs are offline.
+				 */
+				ris->in_reset_state = false;
+
+				if (mpam_is_enabled())
+					mpam_touch_msc(msc, &mpam_save_mbwu_state, ris);
+			}
+			mutex_unlock(&msc->cfg_lock);
+		}
+	}
+
+	return 0;
+}
+
+static void mpam_register_cpuhp_callbacks(int (*online)(unsigned int online),
+					  int (*offline)(unsigned int offline),
+					  char *name)
+{
+	mutex_lock(&mpam_cpuhp_state_lock);
+	if (mpam_cpuhp_state) {
+		cpuhp_remove_state(mpam_cpuhp_state);
+		mpam_cpuhp_state = 0;
+	}
+
+	mpam_cpuhp_state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, name, online,
+					     offline);
+	if (mpam_cpuhp_state <= 0) {
+		pr_err("Failed to register cpuhp callbacks");
+		mpam_cpuhp_state = 0;
+	}
+	mutex_unlock(&mpam_cpuhp_state_lock);
+}
+
+static int __setup_ppi(struct mpam_msc *msc)
+{
+	int cpu;
+
+	msc->error_dev_id = alloc_percpu(struct mpam_msc *);
+	if (!msc->error_dev_id)
+		return -ENOMEM;
+
+	for_each_cpu(cpu, &msc->accessibility)
+		*per_cpu_ptr(msc->error_dev_id, cpu) = msc;
+
+	return 0;
+}
+
+static int mpam_msc_setup_error_irq(struct mpam_msc *msc)
+{
+	int irq;
+
+	irq = platform_get_irq_byname_optional(msc->pdev, "error");
+	if (irq <= 0)
+		return 0;
+
+	/* Allocate and initialise the percpu device pointer for PPI */
+	if (irq_is_percpu(irq))
+		return __setup_ppi(msc);
+
+	/* sanity check: shared interrupts can be routed anywhere? */
+	if (!cpumask_equal(&msc->accessibility, cpu_possible_mask)) {
+		pr_err_once("msc:%u is a private resource with a shared error interrupt",
+			    msc->id);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * An MSC can control traffic from a set of CPUs, but may only be accessible
+ * from a (hopefully wider) set of CPUs. The common reason for this is power
+ * management. If all the CPUs in a cluster are in PSCI:CPU_SUSPEND, the
+ * corresponding cache may also be powered off. By making accesses from
+ * one of those CPUs, we ensure we don't access a cache that's powered off.
+ */
+static void update_msc_accessibility(struct mpam_msc *msc)
+{
+	u32 affinity_id;
+	int err;
+
+	err = device_property_read_u32(&msc->pdev->dev, "cpu_affinity",
+				       &affinity_id);
+	if (err)
+		cpumask_copy(&msc->accessibility, cpu_possible_mask);
+	else
+		acpi_pptt_get_cpus_from_container(affinity_id, &msc->accessibility);
+}
+
+/*
+ * There are two ways of reaching a struct mpam_msc_ris. Via the
+ * class->component->vmsc->ris, or via the msc.
+ * When destroying the msc, the other side needs unlinking and cleaning up too.
+ */
+static void mpam_msc_destroy(struct mpam_msc *msc)
+{
+	struct platform_device *pdev = msc->pdev;
+	struct mpam_msc_ris *ris, *tmp;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_for_each_entry_safe(ris, tmp, &msc->ris, msc_list)
+		mpam_ris_destroy(ris);
+
+	list_del_rcu(&msc->all_msc_list);
+	platform_set_drvdata(pdev, NULL);
+
+	add_to_garbage(msc);
+}
+
+static void mpam_msc_drv_remove(struct platform_device *pdev)
+{
+	struct mpam_msc *msc = platform_get_drvdata(pdev);
+
+	mutex_lock(&mpam_list_lock);
+	mpam_msc_destroy(msc);
+	mutex_unlock(&mpam_list_lock);
+
+	mpam_free_garbage();
+}
+
+static struct mpam_msc *do_mpam_msc_drv_probe(struct platform_device *pdev)
+{
+	int err;
+	u32 tmp;
+	struct mpam_msc *msc;
+	struct resource *msc_res;
+	struct device *dev = &pdev->dev;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	msc = devm_kzalloc(&pdev->dev, sizeof(*msc), GFP_KERNEL);
+	if (!msc)
+		return ERR_PTR(-ENOMEM);
+	init_garbage(&msc->garbage);
+	msc->garbage.pdev = pdev;
+
+	err = devm_mutex_init(dev, &msc->probe_lock);
+	if (err)
+		return ERR_PTR(err);
+
+	err = devm_mutex_init(dev, &msc->part_sel_lock);
+	if (err)
+		return ERR_PTR(err);
+
+	err = devm_mutex_init(dev, &msc->error_irq_lock);
+	if (err)
+		return ERR_PTR(err);
+
+	err = devm_mutex_init(dev, &msc->cfg_lock);
+	if (err)
+		return ERR_PTR(err);
+
+	mpam_mon_sel_lock_init(msc);
+	msc->id = pdev->id;
+	msc->pdev = pdev;
+	INIT_LIST_HEAD_RCU(&msc->all_msc_list);
+	INIT_LIST_HEAD_RCU(&msc->ris);
+
+	update_msc_accessibility(msc);
+	if (cpumask_empty(&msc->accessibility)) {
+		dev_err_once(dev, "MSC is not accessible from any CPU!");
+		return ERR_PTR(-EINVAL);
+	}
+
+	err = mpam_msc_setup_error_irq(msc);
+	if (err)
+		return ERR_PTR(err);
+
+	if (device_property_read_u32(&pdev->dev, "pcc-channel", &tmp))
+		msc->iface = MPAM_IFACE_MMIO;
+	else
+		msc->iface = MPAM_IFACE_PCC;
+
+	if (msc->iface == MPAM_IFACE_MMIO) {
+		void __iomem *io;
+
+		io = devm_platform_get_and_ioremap_resource(pdev, 0,
+							    &msc_res);
+		if (IS_ERR(io)) {
+			dev_err_once(dev, "Failed to map MSC base address\n");
+			return ERR_CAST(io);
+		}
+		msc->mapped_hwpage_sz = msc_res->end - msc_res->start;
+		msc->mapped_hwpage = io;
+	} else {
+		return ERR_PTR(-EINVAL);
+	}
+
+	list_add_rcu(&msc->all_msc_list, &mpam_all_msc);
+	platform_set_drvdata(pdev, msc);
+
+	return msc;
+}
+
+static int fw_num_msc;
+
+static int mpam_msc_drv_probe(struct platform_device *pdev)
+{
+	int err;
+	struct mpam_msc *msc = NULL;
+	void *plat_data = pdev->dev.platform_data;
+
+	mutex_lock(&mpam_list_lock);
+	msc = do_mpam_msc_drv_probe(pdev);
+	mutex_unlock(&mpam_list_lock);
+
+	if (IS_ERR(msc))
+		return PTR_ERR(msc);
+
+	/* Create RIS entries described by firmware */
+	err = acpi_mpam_parse_resources(msc, plat_data);
+	if (err) {
+		mpam_msc_drv_remove(pdev);
+		return err;
+	}
+
+	if (atomic_add_return(1, &mpam_num_msc) == fw_num_msc)
+		mpam_register_cpuhp_callbacks(mpam_discovery_cpu_online, NULL,
+					      "mpam:drv_probe");
+
+	return 0;
+}
+
+static struct platform_driver mpam_msc_driver = {
+	.driver = {
+		.name = "mpam_msc",
+	},
+	.probe = mpam_msc_drv_probe,
+	.remove = mpam_msc_drv_remove,
+};
+
+/* Any of these features mean the BWA_WD field is valid. */
+static bool mpam_has_bwa_wd_feature(struct mpam_props *props)
+{
+	if (mpam_has_feature(mpam_feat_mbw_min, props))
+		return true;
+	if (mpam_has_feature(mpam_feat_mbw_max, props))
+		return true;
+	if (mpam_has_feature(mpam_feat_mbw_prop, props))
+		return true;
+	return false;
+}
+
+/* Any of these features mean the CMAX_WD field is valid. */
+static bool mpam_has_cmax_wd_feature(struct mpam_props *props)
+{
+	if (mpam_has_feature(mpam_feat_cmax_cmax, props))
+		return true;
+	if (mpam_has_feature(mpam_feat_cmax_cmin, props))
+		return true;
+	return false;
+}
+
+#define MISMATCHED_HELPER(parent, child, helper, field, alias)		\
+	helper(parent) &&						\
+	((helper(child) && (parent)->field != (child)->field) ||	\
+	 (!helper(child) && !(alias)))
+
+#define MISMATCHED_FEAT(parent, child, feat, field, alias)		     \
+	mpam_has_feature((feat), (parent)) &&				     \
+	((mpam_has_feature((feat), (child)) && (parent)->field != (child)->field) || \
+	 (!mpam_has_feature((feat), (child)) && !(alias)))
+
+#define CAN_MERGE_FEAT(parent, child, feat, alias)			\
+	(alias) && !mpam_has_feature((feat), (parent)) &&		\
+	mpam_has_feature((feat), (child))
+
+/*
+ * Combine two props fields.
+ * If this is for controls that alias the same resource, it is safe to just
+ * copy the values over. If two aliasing controls implement the same scheme
+ * a safe value must be picked.
+ * For non-aliasing controls, these control different resources, and the
+ * resulting safe value must be compatible with both. When merging values in
+ * the tree, all the aliasing resources must be handled first.
+ * On mismatch, parent is modified.
+ */
+static void __props_mismatch(struct mpam_props *parent,
+			     struct mpam_props *child, bool alias)
+{
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_cpor_part, alias)) {
+		parent->cpbm_wd = child->cpbm_wd;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_cpor_part,
+				   cpbm_wd, alias)) {
+		pr_debug("cleared cpor_part\n");
+		mpam_clear_feature(mpam_feat_cpor_part, parent);
+		parent->cpbm_wd = 0;
+	}
+
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_mbw_part, alias)) {
+		parent->mbw_pbm_bits = child->mbw_pbm_bits;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_mbw_part,
+				   mbw_pbm_bits, alias)) {
+		pr_debug("cleared mbw_part\n");
+		mpam_clear_feature(mpam_feat_mbw_part, parent);
+		parent->mbw_pbm_bits = 0;
+	}
+
+	/* bwa_wd is a count of bits, fewer bits means less precision */
+	if (alias && !mpam_has_bwa_wd_feature(parent) &&
+	    mpam_has_bwa_wd_feature(child)) {
+		parent->bwa_wd = child->bwa_wd;
+	} else if (MISMATCHED_HELPER(parent, child, mpam_has_bwa_wd_feature,
+				     bwa_wd, alias)) {
+		pr_debug("took the min bwa_wd\n");
+		parent->bwa_wd = min(parent->bwa_wd, child->bwa_wd);
+	}
+
+	if (alias && !mpam_has_cmax_wd_feature(parent) && mpam_has_cmax_wd_feature(child)) {
+		parent->cmax_wd = child->cmax_wd;
+	} else if (MISMATCHED_HELPER(parent, child, mpam_has_cmax_wd_feature,
+				     cmax_wd, alias)) {
+		pr_debug("%s took the min cmax_wd\n", __func__);
+		parent->cmax_wd = min(parent->cmax_wd, child->cmax_wd);
+	}
+
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_cmax_cassoc, alias)) {
+		parent->cassoc_wd = child->cassoc_wd;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_cmax_cassoc,
+				   cassoc_wd, alias)) {
+		pr_debug("%s cleared cassoc_wd\n", __func__);
+		mpam_clear_feature(mpam_feat_cmax_cassoc, parent);
+		parent->cassoc_wd = 0;
+	}
+
+	/* For num properties, take the minimum */
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_msmon_csu, alias)) {
+		parent->num_csu_mon = child->num_csu_mon;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_msmon_csu,
+				   num_csu_mon, alias)) {
+		pr_debug("took the min num_csu_mon\n");
+		parent->num_csu_mon = min(parent->num_csu_mon,
+					  child->num_csu_mon);
+	}
+
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_msmon_mbwu, alias)) {
+		parent->num_mbwu_mon = child->num_mbwu_mon;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_msmon_mbwu,
+				   num_mbwu_mon, alias)) {
+		pr_debug("took the min num_mbwu_mon\n");
+		parent->num_mbwu_mon = min(parent->num_mbwu_mon,
+					   child->num_mbwu_mon);
+	}
+
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_intpri_part, alias)) {
+		parent->intpri_wd = child->intpri_wd;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_intpri_part,
+				   intpri_wd, alias)) {
+		pr_debug("%s took the min intpri_wd\n", __func__);
+		parent->intpri_wd = min(parent->intpri_wd, child->intpri_wd);
+	}
+
+	if (CAN_MERGE_FEAT(parent, child, mpam_feat_dspri_part, alias)) {
+		parent->dspri_wd = child->dspri_wd;
+	} else if (MISMATCHED_FEAT(parent, child, mpam_feat_dspri_part,
+				   dspri_wd, alias)) {
+		pr_debug("%s took the min dspri_wd\n", __func__);
+		parent->dspri_wd = min(parent->dspri_wd, child->dspri_wd);
+	}
+
+	/* TODO: alias support for these two */
+	/* {int,ds}pri may not have differing 0-low behaviour */
+	if (mpam_has_feature(mpam_feat_intpri_part, parent) &&
+	    (!mpam_has_feature(mpam_feat_intpri_part, child) ||
+	     mpam_has_feature(mpam_feat_intpri_part_0_low, parent) !=
+	     mpam_has_feature(mpam_feat_intpri_part_0_low, child))) {
+		pr_debug("%s cleared intpri_part\n", __func__);
+		mpam_clear_feature(mpam_feat_intpri_part, parent);
+		mpam_clear_feature(mpam_feat_intpri_part_0_low, parent);
+	}
+	if (mpam_has_feature(mpam_feat_dspri_part, parent) &&
+	    (!mpam_has_feature(mpam_feat_dspri_part, child) ||
+	     mpam_has_feature(mpam_feat_dspri_part_0_low, parent) !=
+	     mpam_has_feature(mpam_feat_dspri_part_0_low, child))) {
+		pr_debug("%s cleared dspri_part\n", __func__);
+		mpam_clear_feature(mpam_feat_dspri_part, parent);
+		mpam_clear_feature(mpam_feat_dspri_part_0_low, parent);
+	}
+
+	if (alias) {
+		/* Merge features for aliased resources */
+		bitmap_or(parent->features, parent->features, child->features, MPAM_FEATURE_LAST);
+	} else {
+		/* Clear missing features for non aliasing */
+		bitmap_and(parent->features, parent->features, child->features, MPAM_FEATURE_LAST);
+	}
+}
+
+/*
+ * If a vmsc doesn't match class feature/configuration, do the right thing(tm).
+ * For 'num' properties we can just take the minimum.
+ * For properties where the mismatched unused bits would make a difference, we
+ * nobble the class feature, as we can't configure all the resources.
+ * e.g. The L3 cache is composed of two resources with 13 and 17 portion
+ * bitmaps respectively.
+ */
+static void
+__class_props_mismatch(struct mpam_class *class, struct mpam_vmsc *vmsc)
+{
+	struct mpam_props *cprops = &class->props;
+	struct mpam_props *vprops = &vmsc->props;
+	struct device *dev = &vmsc->msc->pdev->dev;
+
+	lockdep_assert_held(&mpam_list_lock); /* we modify class */
+
+	dev_dbg(dev, "Merging features for class:0x%lx &= vmsc:0x%lx\n",
+		(long)cprops->features, (long)vprops->features);
+
+	/* Take the safe value for any common features */
+	__props_mismatch(cprops, vprops, false);
+}
+
+static void
+__vmsc_props_mismatch(struct mpam_vmsc *vmsc, struct mpam_msc_ris *ris)
+{
+	struct mpam_props *rprops = &ris->props;
+	struct mpam_props *vprops = &vmsc->props;
+	struct device *dev = &vmsc->msc->pdev->dev;
+
+	lockdep_assert_held(&mpam_list_lock); /* we modify vmsc */
+
+	dev_dbg(dev, "Merging features for vmsc:0x%lx |= ris:0x%lx\n",
+		(long)vprops->features, (long)rprops->features);
+
+	/*
+	 * Merge mismatched features - Copy any features that aren't common,
+	 * but take the safe value for any common features.
+	 */
+	__props_mismatch(vprops, rprops, true);
+}
+
+/*
+ * Copy the first component's first vMSC's properties and features to the
+ * class. __class_props_mismatch() will remove conflicts.
+ * It is not possible to have a class with no components, or a component with
+ * no resources. The vMSC properties have already been built.
+ */
+static void mpam_enable_init_class_features(struct mpam_class *class)
+{
+	struct mpam_vmsc *vmsc;
+	struct mpam_component *comp;
+
+	comp = list_first_entry(&class->components,
+				struct mpam_component, class_list);
+	vmsc = list_first_entry(&comp->vmsc,
+				struct mpam_vmsc, comp_list);
+
+	class->props = vmsc->props;
+}
+
+static void mpam_enable_merge_vmsc_features(struct mpam_component *comp)
+{
+	struct mpam_vmsc *vmsc;
+	struct mpam_msc_ris *ris;
+	struct mpam_class *class = comp->class;
+
+	list_for_each_entry(vmsc, &comp->vmsc, comp_list) {
+		list_for_each_entry(ris, &vmsc->ris, vmsc_list) {
+			__vmsc_props_mismatch(vmsc, ris);
+			class->nrdy_usec = max(class->nrdy_usec,
+					       vmsc->msc->nrdy_usec);
+		}
+	}
+}
+
+static void mpam_enable_merge_class_features(struct mpam_component *comp)
+{
+	struct mpam_vmsc *vmsc;
+	struct mpam_class *class = comp->class;
+
+	list_for_each_entry(vmsc, &comp->vmsc, comp_list)
+		__class_props_mismatch(class, vmsc);
+}
+
+/*
+ * Merge all the common resource features into class.
+ * vmsc features are bitwise-or'd together by mpam_enable_merge_vmsc_features()
+ * as the first step so that mpam_enable_init_class_features() can initialise
+ * the class with a representative set of features.
+ * Next the mpam_enable_merge_class_features() bitwise-and's all the vmsc
+ * features to form the class features.
+ * Other features are the min/max as appropriate.
+ *
+ * To avoid walking the whole tree twice, the class->nrdy_usec property is
+ * updated when working with the vmsc as it is a max(), and doesn't need
+ * initialising first.
+ */
+static void mpam_enable_merge_features(struct list_head *all_classes_list)
+{
+	struct mpam_class *class;
+	struct mpam_component *comp;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_for_each_entry(class, all_classes_list, classes_list) {
+		list_for_each_entry(comp, &class->components, class_list)
+			mpam_enable_merge_vmsc_features(comp);
+
+		mpam_enable_init_class_features(class);
+
+		list_for_each_entry(comp, &class->components, class_list)
+			mpam_enable_merge_class_features(comp);
+	}
+}
+
+static char *mpam_errcode_names[16] = {
+	[MPAM_ERRCODE_NONE]			= "No error",
+	[MPAM_ERRCODE_PARTID_SEL_RANGE]		= "PARTID_SEL_Range",
+	[MPAM_ERRCODE_REQ_PARTID_RANGE]		= "Req_PARTID_Range",
+	[MPAM_ERRCODE_MSMONCFG_ID_RANGE]	= "MSMONCFG_ID_RANGE",
+	[MPAM_ERRCODE_REQ_PMG_RANGE]		= "Req_PMG_Range",
+	[MPAM_ERRCODE_MONITOR_RANGE]		= "Monitor_Range",
+	[MPAM_ERRCODE_INTPARTID_RANGE]		= "intPARTID_Range",
+	[MPAM_ERRCODE_UNEXPECTED_INTERNAL]	= "Unexpected_INTERNAL",
+	[MPAM_ERRCODE_UNDEFINED_RIS_PART_SEL]	= "Undefined_RIS_PART_SEL",
+	[MPAM_ERRCODE_RIS_NO_CONTROL]		= "RIS_No_Control",
+	[MPAM_ERRCODE_UNDEFINED_RIS_MON_SEL]	= "Undefined_RIS_MON_SEL",
+	[MPAM_ERRCODE_RIS_NO_MONITOR]		= "RIS_No_Monitor",
+	[12 ... 15] = "Reserved"
+};
+
+static int mpam_enable_msc_ecr(void *_msc)
+{
+	struct mpam_msc *msc = _msc;
+
+	__mpam_write_reg(msc, MPAMF_ECR, MPAMF_ECR_INTEN);
+
+	return 0;
+}
+
+/* This can run in mpam_disable(), and the interrupt handler on the same CPU */
+static int mpam_disable_msc_ecr(void *_msc)
+{
+	struct mpam_msc *msc = _msc;
+
+	__mpam_write_reg(msc, MPAMF_ECR, 0);
+
+	return 0;
+}
+
+static irqreturn_t __mpam_irq_handler(int irq, struct mpam_msc *msc)
+{
+	u64 reg;
+	u16 partid;
+	u8 errcode, pmg, ris;
+
+	if (WARN_ON_ONCE(!msc) ||
+	    WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(),
+					   &msc->accessibility)))
+		return IRQ_NONE;
+
+	reg = mpam_msc_read_esr(msc);
+
+	errcode = FIELD_GET(MPAMF_ESR_ERRCODE, reg);
+	if (!errcode)
+		return IRQ_NONE;
+
+	/* Clear level triggered irq */
+	mpam_msc_clear_esr(msc);
+
+	partid = FIELD_GET(MPAMF_ESR_PARTID_MON, reg);
+	pmg = FIELD_GET(MPAMF_ESR_PMG, reg);
+	ris = FIELD_GET(MPAMF_ESR_RIS, reg);
+
+	pr_err_ratelimited("error irq from msc:%u '%s', partid:%u, pmg: %u, ris: %u\n",
+			   msc->id, mpam_errcode_names[errcode], partid, pmg,
+			   ris);
+
+	/* Disable this interrupt. */
+	mpam_disable_msc_ecr(msc);
+
+	/* Are we racing with the thread disabling MPAM? */
+	if (!mpam_is_enabled())
+		return IRQ_HANDLED;
+
+	/*
+	 * Schedule the teardown work. Don't use a threaded IRQ as we can't
+	 * unregister the interrupt from the threaded part of the handler.
+	 */
+	mpam_disable_reason = "hardware error interrupt";
+	schedule_work(&mpam_broken_work);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mpam_ppi_handler(int irq, void *dev_id)
+{
+	struct mpam_msc *msc = *(struct mpam_msc **)dev_id;
+
+	return __mpam_irq_handler(irq, msc);
+}
+
+static irqreturn_t mpam_spi_handler(int irq, void *dev_id)
+{
+	struct mpam_msc *msc = dev_id;
+
+	return __mpam_irq_handler(irq, msc);
+}
+
+static int mpam_register_irqs(void)
+{
+	int err, irq;
+	struct mpam_msc *msc;
+
+	lockdep_assert_cpus_held();
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(msc, &mpam_all_msc, all_msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		irq = platform_get_irq_byname_optional(msc->pdev, "error");
+		if (irq <= 0)
+			continue;
+
+		/* The MPAM spec says the interrupt can be SPI, PPI or LPI */
+		/* We anticipate sharing the interrupt with other MSCs */
+		if (irq_is_percpu(irq)) {
+			err = request_percpu_irq(irq, &mpam_ppi_handler,
+						 "mpam:msc:error",
+						 msc->error_dev_id);
+			if (err)
+				return err;
+
+			msc->reenable_error_ppi = irq;
+			smp_call_function_many(&msc->accessibility,
+					       &_enable_percpu_irq, &irq,
+					       true);
+		} else {
+			err = devm_request_irq(&msc->pdev->dev, irq,
+					       &mpam_spi_handler, IRQF_SHARED,
+					       "mpam:msc:error", msc);
+			if (err)
+				return err;
+		}
+
+		mutex_lock(&msc->error_irq_lock);
+		msc->error_irq_req = true;
+		mpam_touch_msc(msc, mpam_enable_msc_ecr, msc);
+		msc->error_irq_hw_enabled = true;
+		mutex_unlock(&msc->error_irq_lock);
+	}
+
+	return 0;
+}
+
+static void mpam_unregister_irqs(void)
+{
+	int irq;
+	struct mpam_msc *msc;
+
+	guard(cpus_read_lock)();
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(msc, &mpam_all_msc, all_msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		irq = platform_get_irq_byname_optional(msc->pdev, "error");
+		if (irq <= 0)
+			continue;
+
+		mutex_lock(&msc->error_irq_lock);
+		if (msc->error_irq_hw_enabled) {
+			mpam_touch_msc(msc, mpam_disable_msc_ecr, msc);
+			msc->error_irq_hw_enabled = false;
+		}
+
+		if (msc->error_irq_req) {
+			if (irq_is_percpu(irq)) {
+				msc->reenable_error_ppi = 0;
+				free_percpu_irq(irq, msc->error_dev_id);
+			} else {
+				devm_free_irq(&msc->pdev->dev, irq, msc);
+			}
+			msc->error_irq_req = false;
+		}
+		mutex_unlock(&msc->error_irq_lock);
+	}
+}
+
+static void __destroy_component_cfg(struct mpam_component *comp)
+{
+	struct mpam_msc *msc;
+	struct mpam_vmsc *vmsc;
+	struct mpam_msc_ris *ris;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	add_to_garbage(comp->cfg);
+	list_for_each_entry(vmsc, &comp->vmsc, comp_list) {
+		msc = vmsc->msc;
+
+		if (mpam_mon_sel_lock(msc)) {
+			list_for_each_entry(ris, &vmsc->ris, vmsc_list)
+				add_to_garbage(ris->mbwu_state);
+			mpam_mon_sel_unlock(msc);
+		}
+	}
+}
+
+static void mpam_reset_component_cfg(struct mpam_component *comp)
+{
+	int i;
+	struct mpam_props *cprops = &comp->class->props;
+
+	mpam_assert_partid_sizes_fixed();
+
+	if (!comp->cfg)
+		return;
+
+	for (i = 0; i <= mpam_partid_max; i++) {
+		comp->cfg[i] = (struct mpam_config) {};
+		if (cprops->cpbm_wd)
+			comp->cfg[i].cpbm = GENMASK(cprops->cpbm_wd - 1, 0);
+		if (cprops->mbw_pbm_bits)
+			comp->cfg[i].mbw_pbm = GENMASK(cprops->mbw_pbm_bits - 1, 0);
+		if (cprops->bwa_wd)
+			comp->cfg[i].mbw_max = GENMASK(15, 16 - cprops->bwa_wd);
+	}
+}
+
+static int __allocate_component_cfg(struct mpam_component *comp)
+{
+	struct mpam_vmsc *vmsc;
+
+	mpam_assert_partid_sizes_fixed();
+
+	if (comp->cfg)
+		return 0;
+
+	comp->cfg = kcalloc(mpam_partid_max + 1, sizeof(*comp->cfg), GFP_KERNEL);
+	if (!comp->cfg)
+		return -ENOMEM;
+
+	/*
+	 * The array is free()d in one go, so only cfg[0]'s structure needs
+	 * to be initialised.
+	 */
+	init_garbage(&comp->cfg[0].garbage);
+
+	mpam_reset_component_cfg(comp);
+
+	list_for_each_entry(vmsc, &comp->vmsc, comp_list) {
+		struct mpam_msc *msc;
+		struct mpam_msc_ris *ris;
+		struct msmon_mbwu_state *mbwu_state;
+
+		if (!vmsc->props.num_mbwu_mon)
+			continue;
+
+		msc = vmsc->msc;
+		list_for_each_entry(ris, &vmsc->ris, vmsc_list) {
+			if (!ris->props.num_mbwu_mon)
+				continue;
+
+			mbwu_state = kcalloc(ris->props.num_mbwu_mon,
+					     sizeof(*ris->mbwu_state),
+					     GFP_KERNEL);
+			if (!mbwu_state) {
+				__destroy_component_cfg(comp);
+				return -ENOMEM;
+			}
+
+			init_garbage(&mbwu_state[0].garbage);
+
+			if (mpam_mon_sel_lock(msc)) {
+				ris->mbwu_state = mbwu_state;
+				mpam_mon_sel_unlock(msc);
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int mpam_allocate_config(void)
+{
+	struct mpam_class *class;
+	struct mpam_component *comp;
+
+	lockdep_assert_held(&mpam_list_lock);
+
+	list_for_each_entry(class, &mpam_classes, classes_list) {
+		list_for_each_entry(comp, &class->components, class_list) {
+			int err = __allocate_component_cfg(comp);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
+}
+
+static void mpam_enable_once(void)
+{
+	int err;
+
+	/*
+	 * Once the cpuhp callbacks have been changed, mpam_partid_max can no
+	 * longer change.
+	 */
+	spin_lock(&partid_max_lock);
+	partid_max_published = true;
+	spin_unlock(&partid_max_lock);
+
+	/*
+	 * If all the MSC have been probed, enabling the IRQs happens next.
+	 * That involves cross-calling to a CPU that can reach the MSC, and
+	 * the locks must be taken in this order:
+	 */
+	cpus_read_lock();
+	mutex_lock(&mpam_list_lock);
+	do {
+		mpam_enable_merge_features(&mpam_classes);
+
+		err = mpam_register_irqs();
+		if (err) {
+			pr_warn("Failed to register irqs: %d\n", err);
+			break;
+		}
+
+		err = mpam_allocate_config();
+		if (err) {
+			pr_err("Failed to allocate configuration arrays.\n");
+			break;
+		}
+	} while (0);
+	mutex_unlock(&mpam_list_lock);
+	cpus_read_unlock();
+
+	if (err) {
+		mpam_disable_reason = "Failed to enable.";
+		schedule_work(&mpam_broken_work);
+		return;
+	}
+
+	static_branch_enable(&mpam_enabled);
+	mpam_register_cpuhp_callbacks(mpam_cpu_online, mpam_cpu_offline,
+				      "mpam:online");
+
+	/* Use printk() to avoid the pr_fmt adding the function name. */
+	printk(KERN_INFO "MPAM enabled with %u PARTIDs and %u PMGs\n",
+	       mpam_partid_max + 1, mpam_pmg_max + 1);
+}
+
+static void mpam_reset_component_locked(struct mpam_component *comp)
+{
+	struct mpam_vmsc *vmsc;
+
+	lockdep_assert_cpus_held();
+	mpam_assert_partid_sizes_fixed();
+
+	mpam_reset_component_cfg(comp);
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(vmsc, &comp->vmsc, comp_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		struct mpam_msc *msc = vmsc->msc;
+		struct mpam_msc_ris *ris;
+
+		list_for_each_entry_srcu(ris, &vmsc->ris, vmsc_list,
+					 srcu_read_lock_held(&mpam_srcu)) {
+			if (!ris->in_reset_state)
+				mpam_touch_msc(msc, mpam_reset_ris, ris);
+			ris->in_reset_state = true;
+		}
+	}
+}
+
+static void mpam_reset_class_locked(struct mpam_class *class)
+{
+	struct mpam_component *comp;
+
+	lockdep_assert_cpus_held();
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(comp, &class->components, class_list,
+				 srcu_read_lock_held(&mpam_srcu))
+		mpam_reset_component_locked(comp);
+}
+
+static void mpam_reset_class(struct mpam_class *class)
+{
+	cpus_read_lock();
+	mpam_reset_class_locked(class);
+	cpus_read_unlock();
+}
+
+/*
+ * Called in response to an error IRQ.
+ * All of MPAMs errors indicate a software bug, restore any modified
+ * controls to their reset values.
+ */
+void mpam_disable(struct work_struct *ignored)
+{
+	int idx;
+	struct mpam_class *class;
+	struct mpam_msc *msc, *tmp;
+
+	mutex_lock(&mpam_cpuhp_state_lock);
+	if (mpam_cpuhp_state) {
+		cpuhp_remove_state(mpam_cpuhp_state);
+		mpam_cpuhp_state = 0;
+	}
+	mutex_unlock(&mpam_cpuhp_state_lock);
+
+	static_branch_disable(&mpam_enabled);
+
+	mpam_unregister_irqs();
+
+	idx = srcu_read_lock(&mpam_srcu);
+	list_for_each_entry_srcu(class, &mpam_classes, classes_list,
+				 srcu_read_lock_held(&mpam_srcu))
+		mpam_reset_class(class);
+	srcu_read_unlock(&mpam_srcu, idx);
+
+	mutex_lock(&mpam_list_lock);
+	list_for_each_entry_safe(msc, tmp, &mpam_all_msc, all_msc_list)
+		mpam_msc_destroy(msc);
+	mutex_unlock(&mpam_list_lock);
+	mpam_free_garbage();
+
+	pr_err_once("MPAM disabled due to %s\n", mpam_disable_reason);
+}
+
+/*
+ * Enable mpam once all devices have been probed.
+ * Scheduled by mpam_discovery_cpu_online() once all devices have been created.
+ * Also scheduled when new devices are probed when new CPUs come online.
+ */
+void mpam_enable(struct work_struct *work)
+{
+	static atomic_t once;
+	struct mpam_msc *msc;
+	bool all_devices_probed = true;
+
+	/* Have we probed all the hw devices? */
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(msc, &mpam_all_msc, all_msc_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		mutex_lock(&msc->probe_lock);
+		if (!msc->probed)
+			all_devices_probed = false;
+		mutex_unlock(&msc->probe_lock);
+
+		if (!all_devices_probed)
+			break;
+	}
+
+	if (all_devices_probed && !atomic_fetch_inc(&once))
+		mpam_enable_once();
+}
+
+#define maybe_update_config(cfg, feature, newcfg, member, changes) do { \
+	if (mpam_has_feature(feature, newcfg) &&			\
+	    (newcfg)->member != (cfg)->member) {			\
+		(cfg)->member = (newcfg)->member;			\
+		mpam_set_feature(feature, cfg);				\
+									\
+		(changes) = true;					\
+	}								\
+} while (0)
+
+static bool mpam_update_config(struct mpam_config *cfg,
+			       const struct mpam_config *newcfg)
+{
+	bool has_changes = false;
+
+	maybe_update_config(cfg, mpam_feat_cpor_part, newcfg, cpbm, has_changes);
+	maybe_update_config(cfg, mpam_feat_mbw_part, newcfg, mbw_pbm, has_changes);
+	maybe_update_config(cfg, mpam_feat_mbw_max, newcfg, mbw_max, has_changes);
+
+	return has_changes;
+}
+
+int mpam_apply_config(struct mpam_component *comp, u16 partid,
+		      struct mpam_config *cfg)
+{
+	struct mpam_write_config_arg arg;
+	struct mpam_msc_ris *ris;
+	struct mpam_vmsc *vmsc;
+	struct mpam_msc *msc;
+
+	lockdep_assert_cpus_held();
+
+	/* Don't pass in the current config! */
+	WARN_ON_ONCE(&comp->cfg[partid] == cfg);
+
+	if (!mpam_update_config(&comp->cfg[partid], cfg))
+		return 0;
+
+	arg.comp = comp;
+	arg.partid = partid;
+
+	guard(srcu)(&mpam_srcu);
+	list_for_each_entry_srcu(vmsc, &comp->vmsc, comp_list,
+				 srcu_read_lock_held(&mpam_srcu)) {
+		msc = vmsc->msc;
+
+		mutex_lock(&msc->cfg_lock);
+		list_for_each_entry_srcu(ris, &vmsc->ris, vmsc_list,
+					 srcu_read_lock_held(&mpam_srcu)) {
+			arg.ris = ris;
+			mpam_touch_msc(msc, __write_config, &arg);
+		}
+		mutex_unlock(&msc->cfg_lock);
+	}
+
+	return 0;
+}
+
+static int __init mpam_msc_driver_init(void)
+{
+	if (!system_supports_mpam())
+		return -EOPNOTSUPP;
+
+	init_srcu_struct(&mpam_srcu);
+
+	fw_num_msc = acpi_mpam_count_msc();
+	if (fw_num_msc <= 0) {
+		pr_err("No MSC devices found in firmware\n");
+		return -EINVAL;
+	}
+
+	return platform_driver_register(&mpam_msc_driver);
+}
+
+/* Must occur after arm64_mpam_register_cpus() from arch_initcall() */
+subsys_initcall(mpam_msc_driver_init);
+
+#ifdef CONFIG_MPAM_KUNIT_TEST
+#include "test_mpam_devices.c"
+#endif

drivers/resctrl/mpam_internal.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2025 Arm Ltd.
+
+#ifndef MPAM_INTERNAL_H
+#define MPAM_INTERNAL_H
+
+#include <linux/arm_mpam.h>
+#include <linux/atomic.h>
+#include <linux/bitmap.h>
+#include <linux/cpumask.h>
+#include <linux/io.h>
+#include <linux/jump_label.h>
+#include <linux/llist.h>
+#include <linux/mutex.h>
+#include <linux/srcu.h>
+#include <linux/spinlock.h>
+#include <linux/srcu.h>
+#include <linux/types.h>
+
+#define MPAM_MSC_MAX_NUM_RIS	16
+
+struct platform_device;
+
+DECLARE_STATIC_KEY_FALSE(mpam_enabled);
+
+#ifdef CONFIG_MPAM_KUNIT_TEST
+#define PACKED_FOR_KUNIT __packed
+#else
+#define PACKED_FOR_KUNIT
+#endif
+
+static inline bool mpam_is_enabled(void)
+{
+	return static_branch_likely(&mpam_enabled);
+}
+
+/*
+ * Structures protected by SRCU may not be freed for a surprising amount of
+ * time (especially if perf is running). To ensure the MPAM error interrupt can
+ * tear down all the structures, build a list of objects that can be garbage
+ * collected once synchronize_srcu() has returned.
+ * If pdev is non-NULL, use devm_kfree().
+ */
+struct mpam_garbage {
+	/* member of mpam_garbage */
+	struct llist_node	llist;
+
+	void			*to_free;
+	struct platform_device	*pdev;
+};
+
+struct mpam_msc {
+	/* member of mpam_all_msc */
+	struct list_head	all_msc_list;
+
+	int			id;
+	struct platform_device	*pdev;
+
+	/* Not modified after mpam_is_enabled() becomes true */
+	enum mpam_msc_iface	iface;
+	u32			nrdy_usec;
+	cpumask_t		accessibility;
+	bool			has_extd_esr;
+
+	int				reenable_error_ppi;
+	struct mpam_msc * __percpu	*error_dev_id;
+
+	atomic_t		online_refs;
+
+	/*
+	 * probe_lock is only taken during discovery. After discovery these
+	 * properties become read-only and the lists are protected by SRCU.
+	 */
+	struct mutex		probe_lock;
+	bool			probed;
+	u16			partid_max;
+	u8			pmg_max;
+	unsigned long		ris_idxs;
+	u32			ris_max;
+
+	/*
+	 * error_irq_lock is taken when registering/unregistering the error
+	 * interrupt and maniupulating the below flags.
+	 */
+	struct mutex		error_irq_lock;
+	bool			error_irq_req;
+	bool			error_irq_hw_enabled;
+
+	/* mpam_msc_ris of this component */
+	struct list_head	ris;
+
+	/*
+	 * part_sel_lock protects access to the MSC hardware registers that are
+	 * affected by MPAMCFG_PART_SEL. (including the ID registers that vary
+	 * by RIS).
+	 * If needed, take msc->probe_lock first.
+	 */
+	struct mutex		part_sel_lock;
+
+	/*
+	 * cfg_lock protects the msc configuration and guards against mbwu_state
+	 * save and restore racing.
+	 */
+	struct mutex		cfg_lock;
+
+	/*
+	 * mon_sel_lock protects access to the MSC hardware registers that are
+	 * affected by MPAMCFG_MON_SEL, and the mbwu_state.
+	 * Access to mon_sel is needed from both process and interrupt contexts,
+	 * but is complicated by firmware-backed platforms that can't make any
+	 * access unless they can sleep.
+	 * Always use the mpam_mon_sel_lock() helpers.
+	 * Accesses to mon_sel need to be able to fail if they occur in the wrong
+	 * context.
+	 * If needed, take msc->probe_lock first.
+	 */
+	raw_spinlock_t		_mon_sel_lock;
+	unsigned long		_mon_sel_flags;
+
+	void __iomem		*mapped_hwpage;
+	size_t			mapped_hwpage_sz;
+
+	struct mpam_garbage	garbage;
+};
+
+/* Returning false here means accesses to mon_sel must fail and report an error. */
+static inline bool __must_check mpam_mon_sel_lock(struct mpam_msc *msc)
+{
+	/* Locking will require updating to support a firmware backed interface */
+	if (WARN_ON_ONCE(msc->iface != MPAM_IFACE_MMIO))
+		return false;
+
+	raw_spin_lock_irqsave(&msc->_mon_sel_lock, msc->_mon_sel_flags);
+	return true;
+}
+
+static inline void mpam_mon_sel_unlock(struct mpam_msc *msc)
+{
+	raw_spin_unlock_irqrestore(&msc->_mon_sel_lock, msc->_mon_sel_flags);
+}
+
+static inline void mpam_mon_sel_lock_held(struct mpam_msc *msc)
+{
+	lockdep_assert_held_once(&msc->_mon_sel_lock);
+}
+
+static inline void mpam_mon_sel_lock_init(struct mpam_msc *msc)
+{
+	raw_spin_lock_init(&msc->_mon_sel_lock);
+}
+
+/* Bits for mpam features bitmaps */
+enum mpam_device_features {
+	mpam_feat_cpor_part,
+	mpam_feat_cmax_softlim,
+	mpam_feat_cmax_cmax,
+	mpam_feat_cmax_cmin,
+	mpam_feat_cmax_cassoc,
+	mpam_feat_mbw_part,
+	mpam_feat_mbw_min,
+	mpam_feat_mbw_max,
+	mpam_feat_mbw_prop,
+	mpam_feat_intpri_part,
+	mpam_feat_intpri_part_0_low,
+	mpam_feat_dspri_part,
+	mpam_feat_dspri_part_0_low,
+	mpam_feat_msmon,
+	mpam_feat_msmon_csu,
+	mpam_feat_msmon_csu_capture,
+	mpam_feat_msmon_csu_xcl,
+	mpam_feat_msmon_csu_hw_nrdy,
+	mpam_feat_msmon_mbwu,
+	mpam_feat_msmon_mbwu_31counter,
+	mpam_feat_msmon_mbwu_44counter,
+	mpam_feat_msmon_mbwu_63counter,
+	mpam_feat_msmon_mbwu_capture,
+	mpam_feat_msmon_mbwu_rwbw,
+	mpam_feat_msmon_mbwu_hw_nrdy,
+	mpam_feat_partid_nrw,
+	MPAM_FEATURE_LAST
+};
+
+struct mpam_props {
+	DECLARE_BITMAP(features, MPAM_FEATURE_LAST);
+
+	u16			cpbm_wd;
+	u16			mbw_pbm_bits;
+	u16			bwa_wd;
+	u16			cmax_wd;
+	u16			cassoc_wd;
+	u16			intpri_wd;
+	u16			dspri_wd;
+	u16			num_csu_mon;
+	u16			num_mbwu_mon;
+
+/*
+ * Kunit tests use memset() to set up feature combinations that should be
+ * removed, and will false-positive if the compiler introduces padding that
+ * isn't cleared during sanitisation.
+ */
+} PACKED_FOR_KUNIT;
+
+#define mpam_has_feature(_feat, x)	test_bit(_feat, (x)->features)
+#define mpam_set_feature(_feat, x)	set_bit(_feat, (x)->features)
+#define mpam_clear_feature(_feat, x)	clear_bit(_feat, (x)->features)
+
+/* The values for MSMON_CFG_MBWU_FLT.RWBW */
+enum mon_filter_options {
+	COUNT_BOTH	= 0,
+	COUNT_WRITE	= 1,
+	COUNT_READ	= 2,
+};
+
+struct mon_cfg {
+	u16			mon;
+	u8			pmg;
+	bool			match_pmg;
+	bool			csu_exclude_clean;
+	u32			partid;
+	enum mon_filter_options opts;
+};
+
+/* Changes to msmon_mbwu_state are protected by the msc's mon_sel_lock. */
+struct msmon_mbwu_state {
+	bool		enabled;
+	bool		reset_on_next_read;
+	struct mon_cfg	cfg;
+
+	/*
+	 * The value to add to the new reading to account for power management,
+	 * and overflow.
+	 */
+	u64		correction;
+
+	struct mpam_garbage	garbage;
+};
+
+struct mpam_class {
+	/* mpam_components in this class */
+	struct list_head	components;
+
+	cpumask_t		affinity;
+
+	struct mpam_props	props;
+	u32			nrdy_usec;
+	u8			level;
+	enum mpam_class_types	type;
+
+	/* member of mpam_classes */
+	struct list_head	classes_list;
+
+	struct ida		ida_csu_mon;
+	struct ida		ida_mbwu_mon;
+
+	struct mpam_garbage	garbage;
+};
+
+struct mpam_config {
+	/* Which configuration values are valid. */
+	DECLARE_BITMAP(features, MPAM_FEATURE_LAST);
+
+	u32	cpbm;
+	u32	mbw_pbm;
+	u16	mbw_max;
+
+	bool	reset_cpbm;
+	bool	reset_mbw_pbm;
+	bool	reset_mbw_max;
+
+	struct mpam_garbage	garbage;
+};
+
+struct mpam_component {
+	u32			comp_id;
+
+	/* mpam_vmsc in this component */
+	struct list_head	vmsc;
+
+	cpumask_t		affinity;
+
+	/*
+	 * Array of configuration values, indexed by partid.
+	 * Read from cpuhp callbacks, hold the cpuhp lock when writing.
+	 */
+	struct mpam_config	*cfg;
+
+	/* member of mpam_class:components */
+	struct list_head	class_list;
+
+	/* parent: */
+	struct mpam_class	*class;
+
+	struct mpam_garbage	garbage;
+};
+
+struct mpam_vmsc {
+	/* member of mpam_component:vmsc_list */
+	struct list_head	comp_list;
+
+	/* mpam_msc_ris in this vmsc */
+	struct list_head	ris;
+
+	struct mpam_props	props;
+
+	/* All RIS in this vMSC are members of this MSC */
+	struct mpam_msc		*msc;
+
+	/* parent: */
+	struct mpam_component	*comp;
+
+	struct mpam_garbage	garbage;
+};
+
+struct mpam_msc_ris {
+	u8			ris_idx;
+	u64			idr;
+	struct mpam_props	props;
+	bool			in_reset_state;
+
+	cpumask_t		affinity;
+
+	/* member of mpam_vmsc:ris */
+	struct list_head	vmsc_list;
+
+	/* member of mpam_msc:ris */
+	struct list_head	msc_list;
+
+	/* parent: */
+	struct mpam_vmsc	*vmsc;
+
+	/* msmon mbwu configuration is preserved over reset */
+	struct msmon_mbwu_state	*mbwu_state;
+
+	struct mpam_garbage	garbage;
+};
+
+static inline int mpam_alloc_csu_mon(struct mpam_class *class)
+{
+	struct mpam_props *cprops = &class->props;
+
+	if (!mpam_has_feature(mpam_feat_msmon_csu, cprops))
+		return -EOPNOTSUPP;
+
+	return ida_alloc_max(&class->ida_csu_mon, cprops->num_csu_mon - 1,
+			     GFP_KERNEL);
+}
+
+static inline void mpam_free_csu_mon(struct mpam_class *class, int csu_mon)
+{
+	ida_free(&class->ida_csu_mon, csu_mon);
+}
+
+static inline int mpam_alloc_mbwu_mon(struct mpam_class *class)
+{
+	struct mpam_props *cprops = &class->props;
+
+	if (!mpam_has_feature(mpam_feat_msmon_mbwu, cprops))
+		return -EOPNOTSUPP;
+
+	return ida_alloc_max(&class->ida_mbwu_mon, cprops->num_mbwu_mon - 1,
+			     GFP_KERNEL);
+}
+
+static inline void mpam_free_mbwu_mon(struct mpam_class *class, int mbwu_mon)
+{
+	ida_free(&class->ida_mbwu_mon, mbwu_mon);
+}
+
+/* List of all classes - protected by srcu*/
+extern struct srcu_struct mpam_srcu;
+extern struct list_head mpam_classes;
+
+/* System wide partid/pmg values */
+extern u16 mpam_partid_max;
+extern u8 mpam_pmg_max;
+
+/* Scheduled work callback to enable mpam once all MSC have been probed */
+void mpam_enable(struct work_struct *work);
+void mpam_disable(struct work_struct *work);
+
+int mpam_apply_config(struct mpam_component *comp, u16 partid,
+		      struct mpam_config *cfg);
+
+int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
+		    enum mpam_device_features, u64 *val);
+void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx);
+
+int mpam_get_cpumask_from_cache_id(unsigned long cache_id, u32 cache_level,
+				   cpumask_t *affinity);
+
+/*
+ * MPAM MSCs have the following register layout. See:
+ * Arm Memory System Resource Partitioning and Monitoring (MPAM) System
+ * Component Specification.
+ * https://developer.arm.com/documentation/ihi0099/aa/
+ */
+#define MPAM_ARCHITECTURE_V1    0x10
+
+/* Memory mapped control pages */
+/* ID Register offsets in the memory mapped page */
+#define MPAMF_IDR		0x0000  /* features id register */
+#define MPAMF_IIDR		0x0018  /* implementer id register */
+#define MPAMF_AIDR		0x0020  /* architectural id register */
+#define MPAMF_IMPL_IDR		0x0028  /* imp-def partitioning */
+#define MPAMF_CPOR_IDR		0x0030  /* cache-portion partitioning */
+#define MPAMF_CCAP_IDR		0x0038  /* cache-capacity partitioning */
+#define MPAMF_MBW_IDR		0x0040  /* mem-bw partitioning */
+#define MPAMF_PRI_IDR		0x0048  /* priority partitioning */
+#define MPAMF_MSMON_IDR		0x0080  /* performance monitoring features */
+#define MPAMF_CSUMON_IDR	0x0088  /* cache-usage monitor */
+#define MPAMF_MBWUMON_IDR	0x0090  /* mem-bw usage monitor */
+#define MPAMF_PARTID_NRW_IDR	0x0050  /* partid-narrowing */
+
+/* Configuration and Status Register offsets in the memory mapped page */
+#define MPAMCFG_PART_SEL	0x0100  /* partid to configure */
+#define MPAMCFG_CPBM		0x1000  /* cache-portion config */
+#define MPAMCFG_CMAX		0x0108  /* cache-capacity config */
+#define MPAMCFG_CMIN		0x0110  /* cache-capacity config */
+#define MPAMCFG_CASSOC		0x0118  /* cache-associativity config */
+#define MPAMCFG_MBW_MIN		0x0200  /* min mem-bw config */
+#define MPAMCFG_MBW_MAX		0x0208  /* max mem-bw config */
+#define MPAMCFG_MBW_WINWD	0x0220  /* mem-bw accounting window config */
+#define MPAMCFG_MBW_PBM		0x2000  /* mem-bw portion bitmap config */
+#define MPAMCFG_PRI		0x0400  /* priority partitioning config */
+#define MPAMCFG_MBW_PROP	0x0500  /* mem-bw stride config */
+#define MPAMCFG_INTPARTID	0x0600  /* partid-narrowing config */
+
+#define MSMON_CFG_MON_SEL	0x0800  /* monitor selector */
+#define MSMON_CFG_CSU_FLT	0x0810  /* cache-usage monitor filter */
+#define MSMON_CFG_CSU_CTL	0x0818  /* cache-usage monitor config */
+#define MSMON_CFG_MBWU_FLT	0x0820  /* mem-bw monitor filter */
+#define MSMON_CFG_MBWU_CTL	0x0828  /* mem-bw monitor config */
+#define MSMON_CSU		0x0840  /* current cache-usage */
+#define MSMON_CSU_CAPTURE	0x0848  /* last cache-usage value captured */
+#define MSMON_MBWU		0x0860  /* current mem-bw usage value */
+#define MSMON_MBWU_CAPTURE	0x0868  /* last mem-bw value captured */
+#define MSMON_MBWU_L		0x0880  /* current long mem-bw usage value */
+#define MSMON_MBWU_L_CAPTURE	0x0890  /* last long mem-bw value captured */
+#define MSMON_CAPT_EVNT		0x0808  /* signal a capture event */
+#define MPAMF_ESR		0x00F8  /* error status register */
+#define MPAMF_ECR		0x00F0  /* error control register */
+
+/* MPAMF_IDR - MPAM features ID register */
+#define MPAMF_IDR_PARTID_MAX		GENMASK(15, 0)
+#define MPAMF_IDR_PMG_MAX		GENMASK(23, 16)
+#define MPAMF_IDR_HAS_CCAP_PART		BIT(24)
+#define MPAMF_IDR_HAS_CPOR_PART		BIT(25)
+#define MPAMF_IDR_HAS_MBW_PART		BIT(26)
+#define MPAMF_IDR_HAS_PRI_PART		BIT(27)
+#define MPAMF_IDR_EXT			BIT(28)
+#define MPAMF_IDR_HAS_IMPL_IDR		BIT(29)
+#define MPAMF_IDR_HAS_MSMON		BIT(30)
+#define MPAMF_IDR_HAS_PARTID_NRW	BIT(31)
+#define MPAMF_IDR_HAS_RIS		BIT(32)
+#define MPAMF_IDR_HAS_EXTD_ESR		BIT(38)
+#define MPAMF_IDR_HAS_ESR		BIT(39)
+#define MPAMF_IDR_RIS_MAX		GENMASK(59, 56)
+
+/* MPAMF_MSMON_IDR - MPAM performance monitoring ID register */
+#define MPAMF_MSMON_IDR_MSMON_CSU		BIT(16)
+#define MPAMF_MSMON_IDR_MSMON_MBWU		BIT(17)
+#define MPAMF_MSMON_IDR_HAS_LOCAL_CAPT_EVNT	BIT(31)
+
+/* MPAMF_CPOR_IDR - MPAM features cache portion partitioning ID register */
+#define MPAMF_CPOR_IDR_CPBM_WD			GENMASK(15, 0)
+
+/* MPAMF_CCAP_IDR - MPAM features cache capacity partitioning ID register */
+#define MPAMF_CCAP_IDR_CMAX_WD			GENMASK(5, 0)
+#define MPAMF_CCAP_IDR_CASSOC_WD		GENMASK(12, 8)
+#define MPAMF_CCAP_IDR_HAS_CASSOC		BIT(28)
+#define MPAMF_CCAP_IDR_HAS_CMIN			BIT(29)
+#define MPAMF_CCAP_IDR_NO_CMAX			BIT(30)
+#define MPAMF_CCAP_IDR_HAS_CMAX_SOFTLIM		BIT(31)
+
+/* MPAMF_MBW_IDR - MPAM features memory bandwidth partitioning ID register */
+#define MPAMF_MBW_IDR_BWA_WD		GENMASK(5, 0)
+#define MPAMF_MBW_IDR_HAS_MIN		BIT(10)
+#define MPAMF_MBW_IDR_HAS_MAX		BIT(11)
+#define MPAMF_MBW_IDR_HAS_PBM		BIT(12)
+#define MPAMF_MBW_IDR_HAS_PROP		BIT(13)
+#define MPAMF_MBW_IDR_WINDWR		BIT(14)
+#define MPAMF_MBW_IDR_BWPBM_WD		GENMASK(28, 16)
+
+/* MPAMF_PRI_IDR - MPAM features priority partitioning ID register */
+#define MPAMF_PRI_IDR_HAS_INTPRI	BIT(0)
+#define MPAMF_PRI_IDR_INTPRI_0_IS_LOW	BIT(1)
+#define MPAMF_PRI_IDR_INTPRI_WD		GENMASK(9, 4)
+#define MPAMF_PRI_IDR_HAS_DSPRI		BIT(16)
+#define MPAMF_PRI_IDR_DSPRI_0_IS_LOW	BIT(17)
+#define MPAMF_PRI_IDR_DSPRI_WD		GENMASK(25, 20)
+
+/* MPAMF_CSUMON_IDR - MPAM cache storage usage monitor ID register */
+#define MPAMF_CSUMON_IDR_NUM_MON	GENMASK(15, 0)
+#define MPAMF_CSUMON_IDR_HAS_OFLOW_CAPT	BIT(24)
+#define MPAMF_CSUMON_IDR_HAS_CEVNT_OFLW	BIT(25)
+#define MPAMF_CSUMON_IDR_HAS_OFSR	BIT(26)
+#define MPAMF_CSUMON_IDR_HAS_OFLOW_LNKG	BIT(27)
+#define MPAMF_CSUMON_IDR_HAS_XCL	BIT(29)
+#define MPAMF_CSUMON_IDR_CSU_RO		BIT(30)
+#define MPAMF_CSUMON_IDR_HAS_CAPTURE	BIT(31)
+
+/* MPAMF_MBWUMON_IDR - MPAM memory bandwidth usage monitor ID register */
+#define MPAMF_MBWUMON_IDR_NUM_MON	GENMASK(15, 0)
+#define MPAMF_MBWUMON_IDR_HAS_RWBW	BIT(28)
+#define MPAMF_MBWUMON_IDR_LWD		BIT(29)
+#define MPAMF_MBWUMON_IDR_HAS_LONG	BIT(30)
+#define MPAMF_MBWUMON_IDR_HAS_CAPTURE	BIT(31)
+
+/* MPAMF_PARTID_NRW_IDR - MPAM PARTID narrowing ID register */
+#define MPAMF_PARTID_NRW_IDR_INTPARTID_MAX	GENMASK(15, 0)
+
+/* MPAMF_IIDR - MPAM implementation ID register */
+#define MPAMF_IIDR_IMPLEMENTER	GENMASK(11, 0)
+#define MPAMF_IIDR_REVISION	GENMASK(15, 12)
+#define MPAMF_IIDR_VARIANT	GENMASK(19, 16)
+#define MPAMF_IIDR_PRODUCTID	GENMASK(31, 20)
+
+/* MPAMF_AIDR - MPAM architecture ID register */
+#define MPAMF_AIDR_ARCH_MINOR_REV	GENMASK(3, 0)
+#define MPAMF_AIDR_ARCH_MAJOR_REV	GENMASK(7, 4)
+
+/* MPAMCFG_PART_SEL - MPAM partition configuration selection register */
+#define MPAMCFG_PART_SEL_PARTID_SEL	GENMASK(15, 0)
+#define MPAMCFG_PART_SEL_INTERNAL	BIT(16)
+#define MPAMCFG_PART_SEL_RIS		GENMASK(27, 24)
+
+/* MPAMCFG_CASSOC - MPAM cache maximum associativity partition configuration register */
+#define MPAMCFG_CASSOC_CASSOC		GENMASK(15, 0)
+
+/* MPAMCFG_CMAX - MPAM cache capacity configuration register */
+#define MPAMCFG_CMAX_SOFTLIM		BIT(31)
+#define MPAMCFG_CMAX_CMAX		GENMASK(15, 0)
+
+/* MPAMCFG_CMIN - MPAM cache capacity configuration register */
+#define MPAMCFG_CMIN_CMIN		GENMASK(15, 0)
+
+/*
+ * MPAMCFG_MBW_MIN - MPAM memory minimum bandwidth partitioning configuration
+ *                   register
+ */
+#define MPAMCFG_MBW_MIN_MIN		GENMASK(15, 0)
+
+/*
+ * MPAMCFG_MBW_MAX - MPAM memory maximum bandwidth partitioning configuration
+ *                   register
+ */
+#define MPAMCFG_MBW_MAX_MAX		GENMASK(15, 0)
+#define MPAMCFG_MBW_MAX_HARDLIM		BIT(31)
+
+/*
+ * MPAMCFG_MBW_WINWD - MPAM memory bandwidth partitioning window width
+ *                     register
+ */
+#define MPAMCFG_MBW_WINWD_US_FRAC	GENMASK(7, 0)
+#define MPAMCFG_MBW_WINWD_US_INT	GENMASK(23, 8)
+
+/* MPAMCFG_PRI - MPAM priority partitioning configuration register */
+#define MPAMCFG_PRI_INTPRI		GENMASK(15, 0)
+#define MPAMCFG_PRI_DSPRI		GENMASK(31, 16)
+
+/*
+ * MPAMCFG_MBW_PROP - Memory bandwidth proportional stride partitioning
+ *                    configuration register
+ */
+#define MPAMCFG_MBW_PROP_STRIDEM1	GENMASK(15, 0)
+#define MPAMCFG_MBW_PROP_EN		BIT(31)
+
+/*
+ * MPAMCFG_INTPARTID - MPAM internal partition narrowing configuration register
+ */
+#define MPAMCFG_INTPARTID_INTPARTID	GENMASK(15, 0)
+#define MPAMCFG_INTPARTID_INTERNAL	BIT(16)
+
+/* MSMON_CFG_MON_SEL - Memory system performance monitor selection register */
+#define MSMON_CFG_MON_SEL_MON_SEL	GENMASK(15, 0)
+#define MSMON_CFG_MON_SEL_RIS		GENMASK(27, 24)
+
+/* MPAMF_ESR - MPAM Error Status Register */
+#define MPAMF_ESR_PARTID_MON	GENMASK(15, 0)
+#define MPAMF_ESR_PMG		GENMASK(23, 16)
+#define MPAMF_ESR_ERRCODE	GENMASK(27, 24)
+#define MPAMF_ESR_OVRWR		BIT(31)
+#define MPAMF_ESR_RIS		GENMASK(35, 32)
+
+/* MPAMF_ECR - MPAM Error Control Register */
+#define MPAMF_ECR_INTEN		BIT(0)
+
+/* Error conditions in accessing memory mapped registers */
+#define MPAM_ERRCODE_NONE			0
+#define MPAM_ERRCODE_PARTID_SEL_RANGE		1
+#define MPAM_ERRCODE_REQ_PARTID_RANGE		2
+#define MPAM_ERRCODE_MSMONCFG_ID_RANGE		3
+#define MPAM_ERRCODE_REQ_PMG_RANGE		4
+#define MPAM_ERRCODE_MONITOR_RANGE		5
+#define MPAM_ERRCODE_INTPARTID_RANGE		6
+#define MPAM_ERRCODE_UNEXPECTED_INTERNAL	7
+#define MPAM_ERRCODE_UNDEFINED_RIS_PART_SEL	8
+#define MPAM_ERRCODE_RIS_NO_CONTROL		9
+#define MPAM_ERRCODE_UNDEFINED_RIS_MON_SEL	10
+#define MPAM_ERRCODE_RIS_NO_MONITOR		11
+
+/*
+ * MSMON_CFG_CSU_CTL - Memory system performance monitor configure cache storage
+ *                    usage monitor control register
+ * MSMON_CFG_MBWU_CTL - Memory system performance monitor configure memory
+ *                     bandwidth usage monitor control register
+ */
+#define MSMON_CFG_x_CTL_TYPE			GENMASK(7, 0)
+#define MSMON_CFG_MBWU_CTL_OFLOW_STATUS_L	BIT(15)
+#define MSMON_CFG_x_CTL_MATCH_PARTID		BIT(16)
+#define MSMON_CFG_x_CTL_MATCH_PMG		BIT(17)
+#define MSMON_CFG_MBWU_CTL_SCLEN		BIT(19)
+#define MSMON_CFG_x_CTL_SUBTYPE			GENMASK(22, 20)
+#define MSMON_CFG_x_CTL_OFLOW_FRZ		BIT(24)
+#define MSMON_CFG_x_CTL_OFLOW_INTR		BIT(25)
+#define MSMON_CFG_x_CTL_OFLOW_STATUS		BIT(26)
+#define MSMON_CFG_x_CTL_CAPT_RESET		BIT(27)
+#define MSMON_CFG_x_CTL_CAPT_EVNT		GENMASK(30, 28)
+#define MSMON_CFG_x_CTL_EN			BIT(31)
+
+#define MSMON_CFG_MBWU_CTL_TYPE_MBWU		0x42
+#define MSMON_CFG_CSU_CTL_TYPE_CSU		0x43
+
+/*
+ * MSMON_CFG_CSU_FLT -  Memory system performance monitor configure cache storage
+ *                      usage monitor filter register
+ * MSMON_CFG_MBWU_FLT - Memory system performance monitor configure memory
+ *                      bandwidth usage monitor filter register
+ */
+#define MSMON_CFG_x_FLT_PARTID			GENMASK(15, 0)
+#define MSMON_CFG_x_FLT_PMG			GENMASK(23, 16)
+
+#define MSMON_CFG_MBWU_FLT_RWBW			GENMASK(31, 30)
+#define MSMON_CFG_CSU_FLT_XCL			BIT(31)
+
+/*
+ * MSMON_CSU - Memory system performance monitor cache storage usage monitor
+ *            register
+ * MSMON_CSU_CAPTURE -  Memory system performance monitor cache storage usage
+ *                     capture register
+ * MSMON_MBWU  - Memory system performance monitor memory bandwidth usage
+ *               monitor register
+ * MSMON_MBWU_CAPTURE - Memory system performance monitor memory bandwidth usage
+ *                     capture register
+ */
+#define MSMON___VALUE		GENMASK(30, 0)
+#define MSMON___NRDY		BIT(31)
+#define MSMON___L_NRDY		BIT(63)
+#define MSMON___L_VALUE		GENMASK(43, 0)
+#define MSMON___LWD_VALUE	GENMASK(62, 0)
+
+/*
+ * MSMON_CAPT_EVNT - Memory system performance monitoring capture event
+ *                  generation register
+ */
+#define MSMON_CAPT_EVNT_NOW	BIT(0)
+
+#endif /* MPAM_INTERNAL_H */

drivers/resctrl/test_mpam_devices.c

···
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2025 Arm Ltd.
+/* This file is intended to be included into mpam_devices.c */
+
+#include <kunit/test.h>
+
+/*
+ * This test catches fields that aren't being sanitised - but can't tell you
+ * which one...
+ */
+static void test__props_mismatch(struct kunit *test)
+{
+	struct mpam_props parent = { 0 };
+	struct mpam_props child;
+
+	memset(&child, 0xff, sizeof(child));
+	__props_mismatch(&parent, &child, false);
+
+	memset(&child, 0, sizeof(child));
+	KUNIT_EXPECT_EQ(test, memcmp(&parent, &child, sizeof(child)), 0);
+
+	memset(&child, 0xff, sizeof(child));
+	__props_mismatch(&parent, &child, true);
+
+	KUNIT_EXPECT_EQ(test, memcmp(&parent, &child, sizeof(child)), 0);
+}
+
+static struct list_head fake_classes_list;
+static struct mpam_class fake_class = { 0 };
+static struct mpam_component fake_comp1 = { 0 };
+static struct mpam_component fake_comp2 = { 0 };
+static struct mpam_vmsc fake_vmsc1 = { 0 };
+static struct mpam_vmsc fake_vmsc2 = { 0 };
+static struct mpam_msc fake_msc1 = { 0 };
+static struct mpam_msc fake_msc2 = { 0 };
+static struct mpam_msc_ris fake_ris1 = { 0 };
+static struct mpam_msc_ris fake_ris2 = { 0 };
+static struct platform_device fake_pdev = { 0 };
+
+static inline void reset_fake_hierarchy(void)
+{
+	INIT_LIST_HEAD(&fake_classes_list);
+
+	memset(&fake_class, 0, sizeof(fake_class));
+	fake_class.level = 3;
+	fake_class.type = MPAM_CLASS_CACHE;
+	INIT_LIST_HEAD_RCU(&fake_class.components);
+	INIT_LIST_HEAD(&fake_class.classes_list);
+
+	memset(&fake_comp1, 0, sizeof(fake_comp1));
+	memset(&fake_comp2, 0, sizeof(fake_comp2));
+	fake_comp1.comp_id = 1;
+	fake_comp2.comp_id = 2;
+	INIT_LIST_HEAD(&fake_comp1.vmsc);
+	INIT_LIST_HEAD(&fake_comp1.class_list);
+	INIT_LIST_HEAD(&fake_comp2.vmsc);
+	INIT_LIST_HEAD(&fake_comp2.class_list);
+
+	memset(&fake_vmsc1, 0, sizeof(fake_vmsc1));
+	memset(&fake_vmsc2, 0, sizeof(fake_vmsc2));
+	INIT_LIST_HEAD(&fake_vmsc1.ris);
+	INIT_LIST_HEAD(&fake_vmsc1.comp_list);
+	fake_vmsc1.msc = &fake_msc1;
+	INIT_LIST_HEAD(&fake_vmsc2.ris);
+	INIT_LIST_HEAD(&fake_vmsc2.comp_list);
+	fake_vmsc2.msc = &fake_msc2;
+
+	memset(&fake_ris1, 0, sizeof(fake_ris1));
+	memset(&fake_ris2, 0, sizeof(fake_ris2));
+	fake_ris1.ris_idx = 1;
+	INIT_LIST_HEAD(&fake_ris1.msc_list);
+	fake_ris2.ris_idx = 2;
+	INIT_LIST_HEAD(&fake_ris2.msc_list);
+
+	fake_msc1.pdev = &fake_pdev;
+	fake_msc2.pdev = &fake_pdev;
+
+	list_add(&fake_class.classes_list, &fake_classes_list);
+}
+
+static void test_mpam_enable_merge_features(struct kunit *test)
+{
+	reset_fake_hierarchy();
+
+	mutex_lock(&mpam_list_lock);
+
+	/* One Class+Comp, two RIS in one vMSC with common features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = NULL;
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = NULL;
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc1;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc1.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 4;
+	fake_ris2.props.cpbm_wd = 4;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 4);
+
+	reset_fake_hierarchy();
+
+	/* One Class+Comp, two RIS in one vMSC with non-overlapping features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = NULL;
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = NULL;
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc1;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc1.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cmax_cmin, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 4;
+	fake_ris2.props.cmax_wd = 4;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	/* Multiple RIS within one MSC controlling the same resource can be mismatched */
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cmax_cmin, &fake_class.props));
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cmax_cmin, &fake_vmsc1.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 4);
+	KUNIT_EXPECT_EQ(test, fake_vmsc1.props.cmax_wd, 4);
+	KUNIT_EXPECT_EQ(test, fake_class.props.cmax_wd, 4);
+
+	reset_fake_hierarchy();
+
+	/* One Class+Comp, two MSC with overlapping features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = NULL;
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = &fake_comp1;
+	list_add(&fake_vmsc2.comp_list, &fake_comp1.vmsc);
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc2;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc2.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 4;
+	fake_ris2.props.cpbm_wd = 4;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 4);
+
+	reset_fake_hierarchy();
+
+	/* One Class+Comp, two MSC with non-overlapping features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = NULL;
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = &fake_comp1;
+	list_add(&fake_vmsc2.comp_list, &fake_comp1.vmsc);
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc2;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc2.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cmax_cmin, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 4;
+	fake_ris2.props.cmax_wd = 4;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	/*
+	 * Multiple RIS in different MSC can't control the same resource,
+	 * mismatched features can not be supported.
+	 */
+	KUNIT_EXPECT_FALSE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_FALSE(test, mpam_has_feature(mpam_feat_cmax_cmin, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 0);
+	KUNIT_EXPECT_EQ(test, fake_class.props.cmax_wd, 0);
+
+	reset_fake_hierarchy();
+
+	/* One Class+Comp, two MSC with incompatible overlapping features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = NULL;
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = &fake_comp1;
+	list_add(&fake_vmsc2.comp_list, &fake_comp1.vmsc);
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc2;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc2.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris2.props);
+	mpam_set_feature(mpam_feat_mbw_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_mbw_part, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 5;
+	fake_ris2.props.cpbm_wd = 3;
+	fake_ris1.props.mbw_pbm_bits = 5;
+	fake_ris2.props.mbw_pbm_bits = 3;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	/*
+	 * Multiple RIS in different MSC can't control the same resource,
+	 * mismatched features can not be supported.
+	 */
+	KUNIT_EXPECT_FALSE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_FALSE(test, mpam_has_feature(mpam_feat_mbw_part, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 0);
+	KUNIT_EXPECT_EQ(test, fake_class.props.mbw_pbm_bits, 0);
+
+	reset_fake_hierarchy();
+
+	/* One Class+Comp, two MSC with overlapping features that need tweaking */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = NULL;
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = &fake_comp1;
+	list_add(&fake_vmsc2.comp_list, &fake_comp1.vmsc);
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc2;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc2.ris);
+
+	mpam_set_feature(mpam_feat_mbw_min, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_mbw_min, &fake_ris2.props);
+	mpam_set_feature(mpam_feat_cmax_cmax, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cmax_cmax, &fake_ris2.props);
+	fake_ris1.props.bwa_wd = 5;
+	fake_ris2.props.bwa_wd = 3;
+	fake_ris1.props.cmax_wd = 5;
+	fake_ris2.props.cmax_wd = 3;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	/*
+	 * RIS with different control properties need to be sanitised so the
+	 * class has the common set of properties.
+	 */
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_mbw_min, &fake_class.props));
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cmax_cmax, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.bwa_wd, 3);
+	KUNIT_EXPECT_EQ(test, fake_class.props.cmax_wd, 3);
+
+	reset_fake_hierarchy();
+
+	/* One Class Two Comp with overlapping features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = &fake_class;
+	list_add(&fake_comp2.class_list, &fake_class.components);
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = &fake_comp2;
+	list_add(&fake_vmsc2.comp_list, &fake_comp2.vmsc);
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc2;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc2.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 4;
+	fake_ris2.props.cpbm_wd = 4;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	KUNIT_EXPECT_TRUE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 4);
+
+	reset_fake_hierarchy();
+
+	/* One Class Two Comp with non-overlapping features */
+	fake_comp1.class = &fake_class;
+	list_add(&fake_comp1.class_list, &fake_class.components);
+	fake_comp2.class = &fake_class;
+	list_add(&fake_comp2.class_list, &fake_class.components);
+	fake_vmsc1.comp = &fake_comp1;
+	list_add(&fake_vmsc1.comp_list, &fake_comp1.vmsc);
+	fake_vmsc2.comp = &fake_comp2;
+	list_add(&fake_vmsc2.comp_list, &fake_comp2.vmsc);
+	fake_ris1.vmsc = &fake_vmsc1;
+	list_add(&fake_ris1.vmsc_list, &fake_vmsc1.ris);
+	fake_ris2.vmsc = &fake_vmsc2;
+	list_add(&fake_ris2.vmsc_list, &fake_vmsc2.ris);
+
+	mpam_set_feature(mpam_feat_cpor_part, &fake_ris1.props);
+	mpam_set_feature(mpam_feat_cmax_cmin, &fake_ris2.props);
+	fake_ris1.props.cpbm_wd = 4;
+	fake_ris2.props.cmax_wd = 4;
+
+	mpam_enable_merge_features(&fake_classes_list);
+
+	/*
+	 * Multiple components can't control the same resource, mismatched features can
+	 * not be supported.
+	 */
+	KUNIT_EXPECT_FALSE(test, mpam_has_feature(mpam_feat_cpor_part, &fake_class.props));
+	KUNIT_EXPECT_FALSE(test, mpam_has_feature(mpam_feat_cmax_cmin, &fake_class.props));
+	KUNIT_EXPECT_EQ(test, fake_class.props.cpbm_wd, 0);
+	KUNIT_EXPECT_EQ(test, fake_class.props.cmax_wd, 0);
+
+	mutex_unlock(&mpam_list_lock);
+}
+
+static void test_mpam_reset_msc_bitmap(struct kunit *test)
+{
+	char __iomem *buf = kunit_kzalloc(test, SZ_16K, GFP_KERNEL);
+	struct mpam_msc fake_msc = {};
+	u32 *test_result;
+
+	if (!buf)
+		return;
+
+	fake_msc.mapped_hwpage = buf;
+	fake_msc.mapped_hwpage_sz = SZ_16K;
+	cpumask_copy(&fake_msc.accessibility, cpu_possible_mask);
+
+	/* Satisfy lockdep checks */
+	mutex_init(&fake_msc.part_sel_lock);
+	mutex_lock(&fake_msc.part_sel_lock);
+
+	test_result = (u32 *)(buf + MPAMCFG_CPBM);
+
+	mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 0);
+	KUNIT_EXPECT_EQ(test, test_result[0], 0);
+	KUNIT_EXPECT_EQ(test, test_result[1], 0);
+	test_result[0] = 0;
+	test_result[1] = 0;
+
+	mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 1);
+	KUNIT_EXPECT_EQ(test, test_result[0], 1);
+	KUNIT_EXPECT_EQ(test, test_result[1], 0);
+	test_result[0] = 0;
+	test_result[1] = 0;
+
+	mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 16);
+	KUNIT_EXPECT_EQ(test, test_result[0], 0xffff);
+	KUNIT_EXPECT_EQ(test, test_result[1], 0);
+	test_result[0] = 0;
+	test_result[1] = 0;
+
+	mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 32);
+	KUNIT_EXPECT_EQ(test, test_result[0], 0xffffffff);
+	KUNIT_EXPECT_EQ(test, test_result[1], 0);
+	test_result[0] = 0;
+	test_result[1] = 0;
+
+	mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 33);
+	KUNIT_EXPECT_EQ(test, test_result[0], 0xffffffff);
+	KUNIT_EXPECT_EQ(test, test_result[1], 1);
+	test_result[0] = 0;
+	test_result[1] = 0;
+
+	mutex_unlock(&fake_msc.part_sel_lock);
+}
+
+static struct kunit_case mpam_devices_test_cases[] = {
+	KUNIT_CASE(test_mpam_reset_msc_bitmap),
+	KUNIT_CASE(test_mpam_enable_merge_features),
+	KUNIT_CASE(test__props_mismatch),
+	{}
+};
+
+static struct kunit_suite mpam_devices_test_suite = {
+	.name = "mpam_devices_test_suite",
+	.test_cases = mpam_devices_test_cases,
+};
+
+kunit_test_suites(&mpam_devices_test_suite);

include/linux/acpi.h

···
 #ifndef _LINUX_ACPI_H
 #define _LINUX_ACPI_H
 
+#include <linux/cleanup.h>
 #include <linux/errno.h>
 #include <linux/ioport.h>	/* for struct resource */
 #include <linux/resource_ext.h>
···
 void acpi_reserve_initial_tables (void);
 void acpi_table_init_complete (void);
 int acpi_table_init (void);
+
+static inline struct acpi_table_header *acpi_get_table_pointer(char *signature, u32 instance)
+{
+	struct acpi_table_header *table;
+	int status = acpi_get_table(signature, instance, &table);
+
+	if (ACPI_FAILURE(status))
+		return ERR_PTR(-ENOENT);
+	return table;
+}
+DEFINE_FREE(acpi_put_table, struct acpi_table_header *, if (!IS_ERR_OR_NULL(_T)) acpi_put_table(_T))
 
 int acpi_table_parse(char *id, acpi_tbl_table_handler handler);
 int __init_or_acpilib acpi_table_parse_entries(char *id,
···
 int acpi_gtdt_init(struct acpi_table_header *table, int *platform_timer_count);
 int acpi_gtdt_map_ppi(int type);
 bool acpi_gtdt_c3stop(int type);
-int acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, int *timer_count);
 #endif
 
 #ifndef ACPI_HAVE_ARCH_SET_ROOT_POINTER
···
 int find_acpi_cpu_topology_cluster(unsigned int cpu);
 int find_acpi_cpu_topology_package(unsigned int cpu);
 int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
+void acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);
+int find_acpi_cache_level_from_id(u32 cache_id);
+int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus);
 #else
 static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
 {
···
 static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu)
 {
 	return -EINVAL;
+}
+static inline void acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,
+						     cpumask_t *cpus) { }
+static inline int find_acpi_cache_level_from_id(u32 cache_id)
+{
+	return -ENOENT;
+}
+static inline int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id,
+						      cpumask_t *cpus)
+{
+	return -ENOENT;
 }
 #endif
 

include/linux/arm_mpam.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2025 Arm Ltd. */
+
+#ifndef __LINUX_ARM_MPAM_H
+#define __LINUX_ARM_MPAM_H
+
+#include <linux/acpi.h>
+#include <linux/types.h>
+
+struct mpam_msc;
+
+enum mpam_msc_iface {
+	MPAM_IFACE_MMIO,	/* a real MPAM MSC */
+	MPAM_IFACE_PCC,		/* a fake MPAM MSC */
+};
+
+enum mpam_class_types {
+	MPAM_CLASS_CACHE,	/* Caches, e.g. L2, L3 */
+	MPAM_CLASS_MEMORY,	/* Main memory */
+	MPAM_CLASS_UNKNOWN,	/* Everything else, e.g. SMMU */
+};
+
+#define MPAM_CLASS_ID_DEFAULT	255
+
+#ifdef CONFIG_ACPI_MPAM
+int acpi_mpam_parse_resources(struct mpam_msc *msc,
+			      struct acpi_mpam_msc_node *tbl_msc);
+
+int acpi_mpam_count_msc(void);
+#else
+static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
+					    struct acpi_mpam_msc_node *tbl_msc)
+{
+	return -EINVAL;
+}
+
+static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
+#endif
+
+#ifdef CONFIG_ARM64_MPAM_DRIVER
+int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
+		    enum mpam_class_types type, u8 class_id, int component_id);
+#else
+static inline int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
+				  enum mpam_class_types type, u8 class_id,
+				  int component_id)
+{
+	return -EINVAL;
+}
+#endif
+
+/**
+ * mpam_register_requestor() - Register a requestor with the MPAM driver
+ * @partid_max:		The maximum PARTID value the requestor can generate.
+ * @pmg_max:		The maximum PMG value the requestor can generate.
+ *
+ * Registers a requestor with the MPAM driver to ensure the chosen system-wide
+ * minimum PARTID and PMG values will allow the requestors features to be used.
+ *
+ * Returns an error if the registration is too late, and a larger PARTID/PMG
+ * value has been advertised to user-space. In this case the requestor should
+ * not use its MPAM features. Returns 0 on success.
+ */
+int mpam_register_requestor(u16 partid_max, u8 pmg_max);
+
+#endif /* __LINUX_ARM_MPAM_H */

include/linux/efi.h

···
 extern void efi_call_virt_check_flags(unsigned long flags, const void *caller);
 extern unsigned long efi_call_virt_save_flags(void);
 
+void efi_runtime_assert_lock_held(void);
+
 enum efi_secureboot_mode {
 	efi_secureboot_mode_unset,
 	efi_secureboot_mode_unknown,

include/linux/huge_mm.h

···
 int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		  pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
 		  struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma);
-void huge_pmd_set_accessed(struct vm_fault *vmf);
+bool huge_pmd_set_accessed(struct vm_fault *vmf);
 int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		  pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
 		  struct vm_area_struct *vma);

include/linux/pgtable.h

···
 #define flush_tlb_fix_spurious_fault(vma, address, ptep) flush_tlb_page(vma, address)
 #endif
 
+#ifndef flush_tlb_fix_spurious_fault_pmd
+#define flush_tlb_fix_spurious_fault_pmd(vma, address, pmdp) do { } while (0)
+#endif
+
 /*
  * When walking page tables, get the address of the next boundary,
  * or the end address of the range if that comes earlier.  Although no

include/linux/platform_device.h

···
 extern int platform_device_add(struct platform_device *pdev);
 extern void platform_device_del(struct platform_device *pdev);
 extern void platform_device_put(struct platform_device *pdev);
+DEFINE_FREE(platform_device_put, struct platform_device *, if (_T) platform_device_put(_T))
 
 struct platform_driver {
 	int (*probe)(struct platform_device *);

mm/huge_memory.c

···
 EXPORT_SYMBOL_GPL(vmf_insert_folio_pud);
 #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 
-void touch_pmd(struct vm_area_struct *vma, unsigned long addr,
+/**
+ * touch_pmd - Mark page table pmd entry as accessed and dirty (for write)
+ * @vma: The VMA covering @addr
+ * @addr: The virtual address
+ * @pmd: pmd pointer into the page table mapping @addr
+ * @write: Whether it's a write access
+ *
+ * Return: whether the pmd entry is changed
+ */
+bool touch_pmd(struct vm_area_struct *vma, unsigned long addr,
 	       pmd_t *pmd, bool write)
 {
-	pmd_t _pmd;
+	pmd_t entry;
 
-	_pmd = pmd_mkyoung(*pmd);
+	entry = pmd_mkyoung(*pmd);
 	if (write)
-		_pmd = pmd_mkdirty(_pmd);
+		entry = pmd_mkdirty(entry);
 	if (pmdp_set_access_flags(vma, addr & HPAGE_PMD_MASK,
-				  pmd, _pmd, write))
+				  pmd, entry, write)) {
 		update_mmu_cache_pmd(vma, addr, pmd);
+		return true;
+	}
+
+	return false;
 }
 
 int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
···
 }
 #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 
-void huge_pmd_set_accessed(struct vm_fault *vmf)
+bool huge_pmd_set_accessed(struct vm_fault *vmf)
 {
 	bool write = vmf->flags & FAULT_FLAG_WRITE;
 
-	vmf->ptl = pmd_lock(vmf->vma->vm_mm, vmf->pmd);
 	if (unlikely(!pmd_same(*vmf->pmd, vmf->orig_pmd)))
-		goto unlock;
+		return false;
 
-	touch_pmd(vmf->vma, vmf->address, vmf->pmd, write);
-
-unlock:
-	spin_unlock(vmf->ptl);
+	return touch_pmd(vmf->vma, vmf->address, vmf->pmd, write);
 }
 
 static vm_fault_t do_huge_zero_wp_pmd(struct vm_fault *vmf)

mm/internal.h

···
  */
 void touch_pud(struct vm_area_struct *vma, unsigned long addr,
 	       pud_t *pud, bool write);
-void touch_pmd(struct vm_area_struct *vma, unsigned long addr,
+bool touch_pmd(struct vm_area_struct *vma, unsigned long addr,
 	       pmd_t *pmd, bool write);
 
 /*

mm/memory.c

···
 }
 
 /*
+ * The page faults may be spurious because of the racy access to the
+ * page table.  For example, a non-populated virtual page is accessed
+ * on 2 CPUs simultaneously, thus the page faults are triggered on
+ * both CPUs.  However, it's possible that one CPU (say CPU A) cannot
+ * find the reason for the page fault if the other CPU (say CPU B) has
+ * changed the page table before the PTE is checked on CPU A.  Most of
+ * the time, the spurious page faults can be ignored safely.  However,
+ * if the page fault is for the write access, it's possible that a
+ * stale read-only TLB entry exists in the local CPU and needs to be
+ * flushed on some architectures.  This is called the spurious page
+ * fault fixing.
+ *
+ * Note: flush_tlb_fix_spurious_fault() is defined as flush_tlb_page()
+ * by default and used as such on most architectures, while
+ * flush_tlb_fix_spurious_fault_pmd() is defined as NOP by default and
+ * used as such on most architectures.
+ */
+static void fix_spurious_fault(struct vm_fault *vmf,
+			       enum pgtable_level ptlevel)
+{
+	/* Skip spurious TLB flush for retried page fault */
+	if (vmf->flags & FAULT_FLAG_TRIED)
+		return;
+	/*
+	 * This is needed only for protection faults but the arch code
+	 * is not yet telling us if this is a protection fault or not.
+	 * This still avoids useless tlb flushes for .text page faults
+	 * with threads.
+	 */
+	if (vmf->flags & FAULT_FLAG_WRITE) {
+		if (ptlevel == PGTABLE_LEVEL_PTE)
+			flush_tlb_fix_spurious_fault(vmf->vma, vmf->address,
+						     vmf->pte);
+		else
+			flush_tlb_fix_spurious_fault_pmd(vmf->vma, vmf->address,
+							 vmf->pmd);
+	}
+}
+/*
  * These routines also need to handle stuff like marking pages dirty
  * and/or accessed for architectures that don't do it in hardware (most
  * RISC architectures).  The early dirtying is also good on the i386.
···
 	}
 	entry = pte_mkyoung(entry);
 	if (ptep_set_access_flags(vmf->vma, vmf->address, vmf->pte, entry,
-				vmf->flags & FAULT_FLAG_WRITE)) {
+				vmf->flags & FAULT_FLAG_WRITE))
 		update_mmu_cache_range(vmf, vmf->vma, vmf->address,
 				vmf->pte, 1);
-	} else {
-		/* Skip spurious TLB flush for retried page fault */
-		if (vmf->flags & FAULT_FLAG_TRIED)
-			goto unlock;
-		/*
-		 * This is needed only for protection faults but the arch code
-		 * is not yet telling us if this is a protection fault or not.
-		 * This still avoids useless tlb flushes for .text page faults
-		 * with threads.
-		 */
-		if (vmf->flags & FAULT_FLAG_WRITE)
-			flush_tlb_fix_spurious_fault(vmf->vma, vmf->address,
-						     vmf->pte);
-	}
+	else
+		fix_spurious_fault(vmf, PGTABLE_LEVEL_PTE);
 unlock:
 	pte_unmap_unlock(vmf->pte, vmf->ptl);
 	return 0;
···
 				if (!(ret & VM_FAULT_FALLBACK))
 					return ret;
 			} else {
-				huge_pmd_set_accessed(&vmf);
+				vmf.ptl = pmd_lock(mm, vmf.pmd);
+				if (!huge_pmd_set_accessed(&vmf))
+					fix_spurious_fault(&vmf, PGTABLE_LEVEL_PMD);
+				spin_unlock(vmf.ptl);
 				return 0;
 			}
 		}

tools/arch/arm64/include/asm/cputype.h

···
 #define MIDR_FUJITSU_ERRATUM_010001_MASK	(~MIDR_CPU_VAR_REV(1, 0))
 #define TCR_CLEAR_FUJITSU_ERRATUM_010001	(TCR_NFD1 | TCR_NFD0)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/sysreg.h>
 
···
 {
 	return read_cpuid(CTR_EL0);
 }
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif

tools/arch/arm64/include/asm/esr.h

···
 #define ESR_ELx_MOPS_ISS_SRCREG(esr)	(((esr) & (UL(0x1f) << 5)) >> 5)
 #define ESR_ELx_MOPS_ISS_SIZEREG(esr)	(((esr) & (UL(0x1f) << 0)) >> 0)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <asm/types.h>
 
 static inline unsigned long esr_brk_comment(unsigned long esr)
···
 }
 
 const char *esr_get_class_string(unsigned long esr);
-#endif /* __ASSEMBLY */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_ESR_H */

tools/arch/arm64/include/asm/gpr-num.h

···
 #ifndef __ASM_GPR_NUM_H
 #define __ASM_GPR_NUM_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
 	.equ	.L__gpr_num_x\num, \num
···
 	.equ	.L__gpr_num_xzr, 31
 	.equ	.L__gpr_num_wzr, 31
 
-#else /* __ASSEMBLY__ */
+#else /* __ASSEMBLER__ */
 
 #define __DEFINE_ASM_GPR_NUMS					\
 "	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n" \
···
 "	.equ	.L__gpr_num_xzr, 31\n"				\
 "	.equ	.L__gpr_num_wzr, 31\n"
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_GPR_NUM_H */

tools/arch/arm64/include/asm/sysreg.h

···
 
 #ifndef CONFIG_BROKEN_GAS_INST
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 // The space separator is omitted so that __emit_inst(x) can be parsed as
 // either an assembler directive or an assembler macro argument.
 #define __emit_inst(x)			.inst(x)
···
 					 (((x) >> 24) & 0x000000ff))
 #endif	/* CONFIG_CPU_BIG_ENDIAN */
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 #define __emit_inst(x)			.long __INSTR_BSWAP(x)
-#else  /* __ASSEMBLY__ */
+#else  /* __ASSEMBLER__ */
 #define __emit_inst(x)			".long " __stringify(__INSTR_BSWAP(x)) "\n\t"
-#endif	/* __ASSEMBLY__ */
+#endif	/* __ASSEMBLER__ */
 
 #endif	/* CONFIG_BROKEN_GAS_INST */
 
···
 
 #define ARM64_FEATURE_FIELD_BITS	4
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 	.macro	mrs_s, rt, sreg
 	 __emit_inst(0xd5200000|(\sreg)|(.L__gpr_num_\rt))

tools/arch/arm64/include/uapi/asm/kvm.h

···
 #define KVM_SPSR_FIQ	4
 #define KVM_NR_SPSR	5
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <linux/psci.h>
 #include <linux/types.h>
 #include <asm/ptrace.h>

tools/testing/selftests/arm64/fp/fp-ptrace.c

···
 
 static bool sve_write_fpsimd_supported(struct test_config *config)
 {
-	if (!sve_supported())
+	if (!sve_supported() && !sme_supported())
 		return false;
 
 	if ((config->svcr_in & SVCR_ZA) != (config->svcr_expected & SVCR_ZA))
···
 
 	vl = vl_expected(config);
 	vq = __sve_vq_from_vl(vl);
-
-	if (!vl)
-		return;
 
 	iov.iov_len = SVE_PT_SIZE(vq, SVE_PT_REGS_FPSIMD);
 	iov.iov_base = malloc(iov.iov_len);

tools/testing/selftests/arm64/fp/sve-ptrace.c

···
 	free(svebuf);
 }
 
+/* Write the FPSIMD registers via the SVE regset when SVE is not supported */
+static void ptrace_sve_fpsimd_no_sve(pid_t child)
+{
+	void *svebuf;
+	struct user_sve_header *sve;
+	struct user_fpsimd_state *fpsimd, new_fpsimd;
+	unsigned int i, j;
+	unsigned char *p;
+	int ret;
+
+	svebuf = malloc(SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD));
+	if (!svebuf) {
+		ksft_test_result_fail("Failed to allocate FPSIMD buffer\n");
+		return;
+	}
+
+	/* On a system without SVE the VL should be set to 0 */
+	memset(svebuf, 0, SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD));
+	sve = svebuf;
+	sve->flags = SVE_PT_REGS_FPSIMD;
+	sve->size = SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD);
+	sve->vl = 0;
+
+	/* Try to set a known FPSIMD state via PT_REGS_SVE */
+	fpsimd = (struct user_fpsimd_state *)((char *)sve +
+					      SVE_PT_FPSIMD_OFFSET);
+	for (i = 0; i < 32; ++i) {
+		p = (unsigned char *)&fpsimd->vregs[i];
+
+		for (j = 0; j < sizeof(fpsimd->vregs[i]); ++j)
+			p[j] = j;
+	}
+
+	ret = set_sve(child, &vec_types[0], sve);
+	ksft_test_result(ret == 0, "FPSIMD write via SVE\n");
+	if (ret) {
+		ksft_test_result_skip("Verify FPSIMD write via SVE\n");
+		goto out;
+	}
+
+	/* Verify via the FPSIMD regset */
+	if (get_fpsimd(child, &new_fpsimd)) {
+		ksft_test_result_skip("Verify FPSIMD write via SVE\n");
+		goto out;
+	}
+	ksft_test_result(memcmp(fpsimd, &new_fpsimd, sizeof(*fpsimd)) == 0,
+			 "Verify FPSIMD write via SVE\n");
+
+out:
+	free(svebuf);
+}
+
 /* Validate attempting to set SVE data and read SVE data */
 static void ptrace_set_sve_get_sve_data(pid_t child,
 					const struct vec_type *type,
···
 						      vec_types[i].name, vl);
 			}
 		}
+	}
+
+	/* We support SVE writes of FPSMID format on SME only systems */
+	if (!(getauxval(AT_HWCAP) & HWCAP_SVE) &&
+	    (getauxval(AT_HWCAP2) & HWCAP2_SME)) {
+		ptrace_sve_fpsimd_no_sve(child);
+	} else {
+		ksft_test_result_skip("FPSIMD write via SVE\n");
+		ksft_test_result_skip("Verify FPSIMD write via SVE\n");
 	}
 
 	ret = EXIT_SUCCESS;

tools/testing/selftests/arm64/fp/zt-test.S

···
 	bl	putdec
 	puts	", iteration="
 	mov	x0, x22
-	bl	putdec
+	bl	putdecn
 	puts	"\tExpected ["
 	mov	x0, x10
 	mov	x1, x12