tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
parisc: Add initial kernel-side perf_event support
Signed-off-by: Helge Deller <deller@gmx.de>
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arch/parisc/Kconfig
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arch/parisc/Kconfig
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arch/parisc/include/asm/perf_event.h
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arch/parisc/include/asm/perf_event.h
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#ifndef __ASM_PARISC_PERF_EVENT_H
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#define __ASM_PARISC_PERF_EVENT_H
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/* Empty, just to avoid compiling error */
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#include <asm/psw.h>
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#define perf_arch_fetch_caller_regs(regs, __ip) { \
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(regs)->gr[0] = KERNEL_PSW; \
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(regs)->iaoq[0] = (__ip); \
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asm volatile("copy %%sp, %0\n":"=r"((regs)->gr[30])); \
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}
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#endif /* __ASM_PARISC_PERF_EVENT_H */
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arch/parisc/include/uapi/asm/perf_regs.h
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arch/parisc/include/uapi/asm/perf_regs.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_ASM_PARISC_PERF_REGS_H
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#define _UAPI_ASM_PARISC_PERF_REGS_H
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/* see struct user_regs_struct */
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enum perf_event_parisc_regs {
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PERF_REG_PARISC_R0, /* PSW is in gr[0] */
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PERF_REG_PARISC_R1,
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PERF_REG_PARISC_R2,
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PERF_REG_PARISC_R3,
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PERF_REG_PARISC_R4,
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PERF_REG_PARISC_R5,
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PERF_REG_PARISC_R6,
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PERF_REG_PARISC_R7,
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PERF_REG_PARISC_R8,
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PERF_REG_PARISC_R9,
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PERF_REG_PARISC_R10,
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PERF_REG_PARISC_R11,
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PERF_REG_PARISC_R12,
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PERF_REG_PARISC_R13,
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PERF_REG_PARISC_R14,
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PERF_REG_PARISC_R15,
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PERF_REG_PARISC_R16,
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PERF_REG_PARISC_R17,
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PERF_REG_PARISC_R18,
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PERF_REG_PARISC_R19,
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PERF_REG_PARISC_R20,
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PERF_REG_PARISC_R21,
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PERF_REG_PARISC_R22,
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PERF_REG_PARISC_R23,
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PERF_REG_PARISC_R24,
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PERF_REG_PARISC_R25,
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PERF_REG_PARISC_R26,
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PERF_REG_PARISC_R27,
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PERF_REG_PARISC_R28,
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PERF_REG_PARISC_R29,
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PERF_REG_PARISC_R30,
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PERF_REG_PARISC_R31,
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PERF_REG_PARISC_SR0,
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PERF_REG_PARISC_SR1,
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PERF_REG_PARISC_SR2,
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PERF_REG_PARISC_SR3,
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PERF_REG_PARISC_SR4,
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PERF_REG_PARISC_SR5,
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PERF_REG_PARISC_SR6,
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PERF_REG_PARISC_SR7,
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PERF_REG_PARISC_IAOQ0,
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PERF_REG_PARISC_IAOQ1,
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PERF_REG_PARISC_IASQ0,
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PERF_REG_PARISC_IASQ1,
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PERF_REG_PARISC_SAR, /* CR11 */
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PERF_REG_PARISC_IIR, /* CR19 */
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PERF_REG_PARISC_ISR, /* CR20 */
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PERF_REG_PARISC_IOR, /* CR21 */
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PERF_REG_PARISC_IPSW, /* CR22 */
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PERF_REG_PARISC_MAX
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};
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#endif /* _UAPI_ASM_PARISC_PERF_REGS_H */
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arch/parisc/kernel/Makefile
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arch/parisc/kernel/Makefile
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obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_regs.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KEXEC_CORE) += kexec.o relocate_kernel.o
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arch/parisc/kernel/perf_event.c
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arch/parisc/kernel/perf_event.c
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Performance event support for parisc
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*
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* Copyright (C) 2025 by Helge Deller <deller@gmx.de>
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*/
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#include <linux/kernel.h>
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#include <linux/perf_event.h>
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#include <asm/unwind.h>
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void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs)
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{
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struct unwind_frame_info info;
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unwind_frame_init_task(&info, current, NULL);
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while (1) {
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if (unwind_once(&info) < 0 || info.ip == 0)
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break;
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if (!__kernel_text_address(info.ip) ||
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perf_callchain_store(entry, info.ip))
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return;
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}
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}
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arch/parisc/kernel/perf_regs.c
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arch/parisc/kernel/perf_regs.c
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2025 by Helge Deller <deller@gmx.de> */
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#include <linux/perf_event.h>
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#include <linux/perf_regs.h>
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#include <asm/ptrace.h>
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u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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switch (idx) {
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case PERF_REG_PARISC_R0 ... PERF_REG_PARISC_R31:
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return regs->gr[idx - PERF_REG_PARISC_R0];
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case PERF_REG_PARISC_SR0 ... PERF_REG_PARISC_SR7:
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return regs->sr[idx - PERF_REG_PARISC_SR0];
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case PERF_REG_PARISC_IASQ0 ... PERF_REG_PARISC_IASQ1:
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return regs->iasq[idx - PERF_REG_PARISC_IASQ0];
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case PERF_REG_PARISC_IAOQ0 ... PERF_REG_PARISC_IAOQ1:
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return regs->iasq[idx - PERF_REG_PARISC_IAOQ0];
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case PERF_REG_PARISC_SAR: /* CR11 */
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return regs->sar;
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case PERF_REG_PARISC_IIR: /* CR19 */
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return regs->iir;
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case PERF_REG_PARISC_ISR: /* CR20 */
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return regs->isr;
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case PERF_REG_PARISC_IOR: /* CR21 */
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return regs->ior;
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case PERF_REG_PARISC_IPSW: /* CR22 */
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return regs->ipsw;
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};
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WARN_ON_ONCE((u32)idx >= PERF_REG_PARISC_MAX);
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return 0;
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}
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#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))
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int perf_reg_validate(u64 mask)
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{
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if (!mask || mask & REG_RESERVED)
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_abi(struct task_struct *task)
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{
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if (!IS_ENABLED(CONFIG_64BIT))
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return PERF_SAMPLE_REGS_ABI_32;
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if (test_tsk_thread_flag(task, TIF_32BIT))
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return PERF_SAMPLE_REGS_ABI_32;
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return PERF_SAMPLE_REGS_ABI_64;
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}
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void perf_get_regs_user(struct perf_regs *regs_user,
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struct pt_regs *regs)
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{
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regs_user->regs = task_pt_regs(current);
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regs_user->abi = perf_reg_abi(current);
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}