tjh.dev
Linux kernel mirror (for testing)
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linux
1# SPDX-License-Identifier: GPL-2.0-only
2# The IOVA library may also be used by non-IOMMU_API users
3config IOMMU_IOVA
4 tristate
5
6# IOMMU_API always gets selected by whoever wants it.
7config IOMMU_API
8 bool
9
10menuconfig IOMMU_SUPPORT
11 bool "IOMMU Hardware Support"
12 depends on MMU
13 default y
14 help
15 Say Y here if you want to compile device drivers for IO Memory
16 Management Units into the kernel. These devices usually allow to
17 remap DMA requests and/or remap interrupts from other devices on the
18 system.
19
20if IOMMU_SUPPORT
21
22menu "Generic IOMMU Pagetable Support"
23
24# Selected by the actual pagetable implementations
25config IOMMU_IO_PGTABLE
26 bool
27
28config IOMMU_IO_PGTABLE_LPAE
29 bool "ARMv7/v8 Long Descriptor Format"
30 select IOMMU_IO_PGTABLE
31 depends on ARM || ARM64 || COMPILE_TEST
32 depends on !GENERIC_ATOMIC64 # for cmpxchg64()
33 help
34 Enable support for the ARM long descriptor pagetable format.
35 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
36 sizes at both stage-1 and stage-2, as well as address spaces
37 up to 48-bits in size.
38
39config IOMMU_IO_PGTABLE_LPAE_SELFTEST
40 bool "LPAE selftests"
41 depends on IOMMU_IO_PGTABLE_LPAE
42 help
43 Enable self-tests for LPAE page table allocator. This performs
44 a series of page-table consistency checks during boot.
45
46 If unsure, say N here.
47
48config IOMMU_IO_PGTABLE_ARMV7S
49 bool "ARMv7/v8 Short Descriptor Format"
50 select IOMMU_IO_PGTABLE
51 depends on ARM || ARM64 || COMPILE_TEST
52 help
53 Enable support for the ARM Short-descriptor pagetable format.
54 This supports 32-bit virtual and physical addresses mapped using
55 2-level tables with 4KB pages/1MB sections, and contiguous entries
56 for 64KB pages/16MB supersections if indicated by the IOMMU driver.
57
58config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
59 bool "ARMv7s selftests"
60 depends on IOMMU_IO_PGTABLE_ARMV7S
61 help
62 Enable self-tests for ARMv7s page table allocator. This performs
63 a series of page-table consistency checks during boot.
64
65 If unsure, say N here.
66
67config IOMMU_IO_PGTABLE_DART
68 bool "Apple DART Formats"
69 select IOMMU_IO_PGTABLE
70 depends on ARM64 || COMPILE_TEST
71 depends on !GENERIC_ATOMIC64 # for cmpxchg64()
72 help
73 Enable support for the Apple DART pagetable formats. These include
74 the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
75 SoCs.
76
77 If unsure, say N here.
78
79endmenu
80
81config IOMMU_DEBUGFS
82 bool "Export IOMMU internals in DebugFS"
83 depends on DEBUG_FS
84 help
85 Allows exposure of IOMMU device internals. This option enables
86 the use of debugfs by IOMMU drivers as required. Devices can,
87 at initialization time, cause the IOMMU code to create a top-level
88 debug/iommu directory, and then populate a subdirectory with
89 entries as required.
90
91choice
92 prompt "IOMMU default domain type"
93 depends on IOMMU_API
94 default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64
95 default IOMMU_DEFAULT_DMA_STRICT
96 help
97 Choose the type of IOMMU domain used to manage DMA API usage by
98 device drivers. The options here typically represent different
99 levels of tradeoff between robustness/security and performance,
100 depending on the IOMMU driver. Not all IOMMUs support all options.
101 This choice can be overridden at boot via the command line, and for
102 some devices also at runtime via sysfs.
103
104 If unsure, keep the default.
105
106config IOMMU_DEFAULT_DMA_STRICT
107 bool "Translated - Strict"
108 help
109 Trusted devices use translation to restrict their access to only
110 DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent
111 to passing "iommu.passthrough=0 iommu.strict=1" on the command line.
112
113 Untrusted devices always use this mode, with an additional layer of
114 bounce-buffering such that they cannot gain access to any unrelated
115 data within a mapped page.
116
117config IOMMU_DEFAULT_DMA_LAZY
118 bool "Translated - Lazy"
119 help
120 Trusted devices use translation to restrict their access to only
121 DMA-mapped pages, but with "lazy" batched TLB invalidation. This
122 mode allows higher performance with some IOMMUs due to reduced TLB
123 flushing, but at the cost of reduced isolation since devices may be
124 able to access memory for some time after it has been unmapped.
125 Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the
126 command line.
127
128 If this mode is not supported by the IOMMU driver, the effective
129 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
130
131config IOMMU_DEFAULT_PASSTHROUGH
132 bool "Passthrough"
133 help
134 Trusted devices are identity-mapped, giving them unrestricted access
135 to memory with minimal performance overhead. Equivalent to passing
136 "iommu.passthrough=1" (historically "iommu=pt") on the command line.
137
138 If this mode is not supported by the IOMMU driver, the effective
139 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
140
141endchoice
142
143config OF_IOMMU
144 def_bool y
145 depends on OF && IOMMU_API
146
147# IOMMU-agnostic DMA-mapping layer
148config IOMMU_DMA
149 def_bool ARM64 || IA64 || X86
150 select DMA_OPS
151 select IOMMU_API
152 select IOMMU_IOVA
153 select IRQ_MSI_IOMMU
154 select NEED_SG_DMA_LENGTH
155 select NEED_SG_DMA_FLAGS if SWIOTLB
156
157# Shared Virtual Addressing
158config IOMMU_SVA
159 bool
160
161config FSL_PAMU
162 bool "Freescale IOMMU support"
163 depends on PCI
164 depends on PHYS_64BIT
165 depends on PPC_E500MC || (COMPILE_TEST && PPC)
166 select IOMMU_API
167 select GENERIC_ALLOCATOR
168 help
169 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
170 PAMU can authorize memory access, remap the memory address, and remap I/O
171 transaction types.
172
173# MSM IOMMU support
174config MSM_IOMMU
175 bool "MSM IOMMU Support"
176 depends on ARM
177 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
178 select IOMMU_API
179 select IOMMU_IO_PGTABLE_ARMV7S
180 help
181 Support for the IOMMUs found on certain Qualcomm SOCs.
182 These IOMMUs allow virtualization of the address space used by most
183 cores within the multimedia subsystem.
184
185 If unsure, say N here.
186
187source "drivers/iommu/amd/Kconfig"
188source "drivers/iommu/intel/Kconfig"
189source "drivers/iommu/iommufd/Kconfig"
190
191config IRQ_REMAP
192 bool "Support for Interrupt Remapping"
193 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
194 select DMAR_TABLE
195 help
196 Supports Interrupt remapping for IO-APIC and MSI devices.
197 To use x2apic mode in the CPU's which support x2APIC enhancements or
198 to support platforms with CPU's having > 8 bit APIC ID, say Y.
199
200# OMAP IOMMU support
201config OMAP_IOMMU
202 bool "OMAP IOMMU Support"
203 depends on ARCH_OMAP2PLUS || COMPILE_TEST
204 select IOMMU_API
205 help
206 The OMAP3 media platform drivers depend on iommu support,
207 if you need them say Y here.
208
209config OMAP_IOMMU_DEBUG
210 bool "Export OMAP IOMMU internals in DebugFS"
211 depends on OMAP_IOMMU && DEBUG_FS
212 help
213 Select this to see extensive information about
214 the internal state of OMAP IOMMU in debugfs.
215
216 Say N unless you know you need this.
217
218config ROCKCHIP_IOMMU
219 bool "Rockchip IOMMU Support"
220 depends on ARCH_ROCKCHIP || COMPILE_TEST
221 select IOMMU_API
222 select ARM_DMA_USE_IOMMU
223 help
224 Support for IOMMUs found on Rockchip rk32xx SOCs.
225 These IOMMUs allow virtualization of the address space used by most
226 cores within the multimedia subsystem.
227 Say Y here if you are using a Rockchip SoC that includes an IOMMU
228 device.
229
230config SUN50I_IOMMU
231 bool "Allwinner H6 IOMMU Support"
232 depends on HAS_DMA
233 depends on ARCH_SUNXI || COMPILE_TEST
234 select ARM_DMA_USE_IOMMU
235 select IOMMU_API
236 help
237 Support for the IOMMU introduced in the Allwinner H6 SoCs.
238
239config TEGRA_IOMMU_GART
240 bool "Tegra GART IOMMU Support"
241 depends on ARCH_TEGRA_2x_SOC
242 depends on TEGRA_MC
243 select IOMMU_API
244 help
245 Enables support for remapping discontiguous physical memory
246 shared with the operating system into contiguous I/O virtual
247 space through the GART (Graphics Address Relocation Table)
248 hardware included on Tegra SoCs.
249
250config TEGRA_IOMMU_SMMU
251 bool "NVIDIA Tegra SMMU Support"
252 depends on ARCH_TEGRA
253 depends on TEGRA_AHB
254 depends on TEGRA_MC
255 select IOMMU_API
256 help
257 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
258 SoCs (Tegra30 up to Tegra210).
259
260config EXYNOS_IOMMU
261 bool "Exynos IOMMU Support"
262 depends on ARCH_EXYNOS || COMPILE_TEST
263 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
264 select IOMMU_API
265 select ARM_DMA_USE_IOMMU
266 help
267 Support for the IOMMU (System MMU) of Samsung Exynos application
268 processor family. This enables H/W multimedia accelerators to see
269 non-linear physical memory chunks as linear memory in their
270 address space.
271
272 If unsure, say N here.
273
274config EXYNOS_IOMMU_DEBUG
275 bool "Debugging log for Exynos IOMMU"
276 depends on EXYNOS_IOMMU
277 help
278 Select this to see the detailed log message that shows what
279 happens in the IOMMU driver.
280
281 Say N unless you need kernel log message for IOMMU debugging.
282
283config IPMMU_VMSA
284 bool "Renesas VMSA-compatible IPMMU"
285 depends on ARCH_RENESAS || COMPILE_TEST
286 depends on ARM || ARM64 || COMPILE_TEST
287 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
288 select IOMMU_API
289 select IOMMU_IO_PGTABLE_LPAE
290 select ARM_DMA_USE_IOMMU
291 help
292 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
293 APE6, R-Car Gen{2,3} and RZ/G{1,2} SoCs.
294
295 If unsure, say N.
296
297config SPAPR_TCE_IOMMU
298 bool "sPAPR TCE IOMMU Support"
299 depends on PPC_POWERNV || PPC_PSERIES
300 select IOMMU_API
301 help
302 Enables bits of IOMMU API required by VFIO. The iommu_ops
303 is not implemented as it is not necessary for VFIO.
304
305config APPLE_DART
306 tristate "Apple DART IOMMU Support"
307 depends on ARCH_APPLE || COMPILE_TEST
308 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART
309 select IOMMU_API
310 select IOMMU_IO_PGTABLE_DART
311 default ARCH_APPLE
312 help
313 Support for Apple DART (Device Address Resolution Table) IOMMUs
314 found in Apple ARM SoCs like the M1.
315 This IOMMU is required for most peripherals using DMA to access
316 the main memory.
317
318 Say Y here if you are using an Apple SoC.
319
320# ARM IOMMU support
321config ARM_SMMU
322 tristate "ARM Ltd. System MMU (SMMU) Support"
323 depends on ARM64 || ARM || COMPILE_TEST
324 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
325 select IOMMU_API
326 select IOMMU_IO_PGTABLE_LPAE
327 select ARM_DMA_USE_IOMMU if ARM
328 help
329 Support for implementations of the ARM System MMU architecture
330 versions 1 and 2.
331
332 Say Y here if your SoC includes an IOMMU device implementing
333 the ARM SMMU architecture.
334
335config ARM_SMMU_LEGACY_DT_BINDINGS
336 bool "Support the legacy \"mmu-masters\" devicetree bindings"
337 depends on ARM_SMMU=y && OF
338 help
339 Support for the badly designed and deprecated "mmu-masters"
340 devicetree bindings. This allows some DMA masters to attach
341 to the SMMU but does not provide any support via the DMA API.
342 If you're lucky, you might be able to get VFIO up and running.
343
344 If you say Y here then you'll make me very sad. Instead, say N
345 and move your firmware to the utopian future that was 2016.
346
347config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
348 bool "Default to disabling bypass on ARM SMMU v1 and v2"
349 depends on ARM_SMMU
350 default y
351 help
352 Say Y here to (by default) disable bypass streams such that
353 incoming transactions from devices that are not attached to
354 an iommu domain will report an abort back to the device and
355 will not be allowed to pass through the SMMU.
356
357 Any old kernels that existed before this KConfig was
358 introduced would default to _allowing_ bypass (AKA the
359 equivalent of NO for this config). However the default for
360 this option is YES because the old behavior is insecure.
361
362 There are few reasons to allow unmatched stream bypass, and
363 even fewer good ones. If saying YES here breaks your board
364 you should work on fixing your board. This KConfig option
365 is expected to be removed in the future and we'll simply
366 hardcode the bypass disable in the code.
367
368 NOTE: the kernel command line parameter
369 'arm-smmu.disable_bypass' will continue to override this
370 config.
371
372config ARM_SMMU_QCOM
373 def_tristate y
374 depends on ARM_SMMU && ARCH_QCOM
375 select QCOM_SCM
376 help
377 When running on a Qualcomm platform that has the custom variant
378 of the ARM SMMU, this needs to be built into the SMMU driver.
379
380config ARM_SMMU_QCOM_DEBUG
381 bool "ARM SMMU QCOM implementation defined debug support"
382 depends on ARM_SMMU_QCOM
383 help
384 Support for implementation specific debug features in ARM SMMU
385 hardware found in QTI platforms.
386
387 Say Y here to enable debug for issues such as TLB sync timeouts
388 which requires implementation defined register dumps.
389
390config ARM_SMMU_V3
391 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
392 depends on ARM64
393 select IOMMU_API
394 select IOMMU_IO_PGTABLE_LPAE
395 select GENERIC_MSI_IRQ
396 help
397 Support for implementations of the ARM System MMU architecture
398 version 3 providing translation support to a PCIe root complex.
399
400 Say Y here if your system includes an IOMMU device implementing
401 the ARM SMMUv3 architecture.
402
403config ARM_SMMU_V3_SVA
404 bool "Shared Virtual Addressing support for the ARM SMMUv3"
405 depends on ARM_SMMU_V3
406 select IOMMU_SVA
407 select MMU_NOTIFIER
408 help
409 Support for sharing process address spaces with devices using the
410 SMMUv3.
411
412 Say Y here if your system supports SVA extensions such as PCIe PASID
413 and PRI.
414
415config S390_IOMMU
416 def_bool y if S390 && PCI
417 depends on S390 && PCI
418 select IOMMU_API
419 help
420 Support for the IOMMU API for s390 PCI devices.
421
422config MTK_IOMMU
423 tristate "MediaTek IOMMU Support"
424 depends on ARCH_MEDIATEK || COMPILE_TEST
425 select ARM_DMA_USE_IOMMU
426 select IOMMU_API
427 select IOMMU_IO_PGTABLE_ARMV7S
428 select MEMORY
429 select MTK_SMI
430 help
431 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
432 Memory Management Unit. This option enables remapping of DMA memory
433 accesses for the multimedia subsystem.
434
435 If unsure, say N here.
436
437config MTK_IOMMU_V1
438 tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
439 depends on ARM
440 depends on ARCH_MEDIATEK || COMPILE_TEST
441 select ARM_DMA_USE_IOMMU
442 select IOMMU_API
443 select MEMORY
444 select MTK_SMI
445 help
446 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
447 Multimedia Memory Managememt Unit. This option enables remapping of
448 DMA memory accesses for the multimedia subsystem.
449
450 if unsure, say N here.
451
452config QCOM_IOMMU
453 # Note: iommu drivers cannot (yet?) be built as modules
454 bool "Qualcomm IOMMU Support"
455 depends on ARCH_QCOM || COMPILE_TEST
456 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
457 select QCOM_SCM
458 select IOMMU_API
459 select IOMMU_IO_PGTABLE_LPAE
460 select ARM_DMA_USE_IOMMU
461 help
462 Support for IOMMU on certain Qualcomm SoCs.
463
464config HYPERV_IOMMU
465 bool "Hyper-V IRQ Handling"
466 depends on HYPERV && X86
467 select IOMMU_API
468 default HYPERV
469 help
470 Stub IOMMU driver to handle IRQs to support Hyper-V Linux
471 guest and root partitions.
472
473config VIRTIO_IOMMU
474 tristate "Virtio IOMMU driver"
475 depends on VIRTIO
476 depends on (ARM64 || X86)
477 select IOMMU_API
478 select INTERVAL_TREE
479 select ACPI_VIOT if ACPI
480 help
481 Para-virtualised IOMMU driver with virtio.
482
483 Say Y here if you intend to run this kernel as a guest.
484
485config SPRD_IOMMU
486 tristate "Unisoc IOMMU Support"
487 depends on ARCH_SPRD || COMPILE_TEST
488 select IOMMU_API
489 help
490 Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by
491 Unisoc's multimedia devices, such as display, Image codec(jpeg)
492 and a few signal processors, including VSP(video), GSP(graphic),
493 ISP(image), and CPP(camera pixel processor), etc.
494
495 Say Y here if you want to use the multimedia devices listed above.
496
497endif # IOMMU_SUPPORT