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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
10config IOMMUFD_DRIVER
11 bool
12 default n
13
14menuconfig IOMMU_SUPPORT
15 bool "IOMMU Hardware Support"
16 depends on MMU
17 default y
18 help
19 Say Y here if you want to compile device drivers for IO Memory
20 Management Units into the kernel. These devices usually allow to
21 remap DMA requests and/or remap interrupts from other devices on the
22 system.
23
24if IOMMU_SUPPORT
25
26menu "Generic IOMMU Pagetable Support"
27
28# Selected by the actual pagetable implementations
29config IOMMU_IO_PGTABLE
30 bool
31
32config IOMMU_IO_PGTABLE_LPAE
33 bool "ARMv7/v8 Long Descriptor Format"
34 select IOMMU_IO_PGTABLE
35 depends on ARM || ARM64 || COMPILE_TEST
36 depends on !GENERIC_ATOMIC64 # for cmpxchg64()
37 help
38 Enable support for the ARM long descriptor pagetable format.
39 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
40 sizes at both stage-1 and stage-2, as well as address spaces
41 up to 48-bits in size.
42
43config IOMMU_IO_PGTABLE_LPAE_SELFTEST
44 bool "LPAE selftests"
45 depends on IOMMU_IO_PGTABLE_LPAE
46 help
47 Enable self-tests for LPAE page table allocator. This performs
48 a series of page-table consistency checks during boot.
49
50 If unsure, say N here.
51
52config IOMMU_IO_PGTABLE_ARMV7S
53 bool "ARMv7/v8 Short Descriptor Format"
54 select IOMMU_IO_PGTABLE
55 depends on ARM || ARM64 || COMPILE_TEST
56 help
57 Enable support for the ARM Short-descriptor pagetable format.
58 This supports 32-bit virtual and physical addresses mapped using
59 2-level tables with 4KB pages/1MB sections, and contiguous entries
60 for 64KB pages/16MB supersections if indicated by the IOMMU driver.
61
62config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
63 bool "ARMv7s selftests"
64 depends on IOMMU_IO_PGTABLE_ARMV7S
65 help
66 Enable self-tests for ARMv7s page table allocator. This performs
67 a series of page-table consistency checks during boot.
68
69 If unsure, say N here.
70
71config IOMMU_IO_PGTABLE_DART
72 bool "Apple DART Formats"
73 select IOMMU_IO_PGTABLE
74 depends on ARM64 || COMPILE_TEST
75 depends on !GENERIC_ATOMIC64 # for cmpxchg64()
76 help
77 Enable support for the Apple DART pagetable formats. These include
78 the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
79 SoCs.
80
81 If unsure, say N here.
82
83endmenu
84
85config IOMMU_DEBUGFS
86 bool "Export IOMMU internals in DebugFS"
87 depends on DEBUG_FS
88 help
89 Allows exposure of IOMMU device internals. This option enables
90 the use of debugfs by IOMMU drivers as required. Devices can,
91 at initialization time, cause the IOMMU code to create a top-level
92 debug/iommu directory, and then populate a subdirectory with
93 entries as required.
94
95choice
96 prompt "IOMMU default domain type"
97 depends on IOMMU_API
98 default IOMMU_DEFAULT_DMA_LAZY if X86 || S390
99 default IOMMU_DEFAULT_DMA_STRICT
100 help
101 Choose the type of IOMMU domain used to manage DMA API usage by
102 device drivers. The options here typically represent different
103 levels of tradeoff between robustness/security and performance,
104 depending on the IOMMU driver. Not all IOMMUs support all options.
105 This choice can be overridden at boot via the command line, and for
106 some devices also at runtime via sysfs.
107
108 If unsure, keep the default.
109
110config IOMMU_DEFAULT_DMA_STRICT
111 bool "Translated - Strict"
112 help
113 Trusted devices use translation to restrict their access to only
114 DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent
115 to passing "iommu.passthrough=0 iommu.strict=1" on the command line.
116
117 Untrusted devices always use this mode, with an additional layer of
118 bounce-buffering such that they cannot gain access to any unrelated
119 data within a mapped page.
120
121config IOMMU_DEFAULT_DMA_LAZY
122 bool "Translated - Lazy"
123 help
124 Trusted devices use translation to restrict their access to only
125 DMA-mapped pages, but with "lazy" batched TLB invalidation. This
126 mode allows higher performance with some IOMMUs due to reduced TLB
127 flushing, but at the cost of reduced isolation since devices may be
128 able to access memory for some time after it has been unmapped.
129 Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the
130 command line.
131
132 If this mode is not supported by the IOMMU driver, the effective
133 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
134
135config IOMMU_DEFAULT_PASSTHROUGH
136 bool "Passthrough"
137 help
138 Trusted devices are identity-mapped, giving them unrestricted access
139 to memory with minimal performance overhead. Equivalent to passing
140 "iommu.passthrough=1" (historically "iommu=pt") on the command line.
141
142 If this mode is not supported by the IOMMU driver, the effective
143 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
144
145endchoice
146
147config OF_IOMMU
148 def_bool y
149 depends on OF && IOMMU_API
150
151# IOMMU-agnostic DMA-mapping layer
152config IOMMU_DMA
153 def_bool ARM64 || X86 || S390
154 select DMA_OPS_HELPERS
155 select IOMMU_API
156 select IOMMU_IOVA
157 select IRQ_MSI_IOMMU
158 select NEED_SG_DMA_LENGTH
159 select NEED_SG_DMA_FLAGS if SWIOTLB
160
161# Shared Virtual Addressing
162config IOMMU_SVA
163 select IOMMU_MM_DATA
164 bool
165
166config IOMMU_IOPF
167 bool
168
169config FSL_PAMU
170 bool "Freescale IOMMU support"
171 depends on PCI
172 depends on PHYS_64BIT
173 depends on PPC_E500MC || (COMPILE_TEST && PPC)
174 select IOMMU_API
175 select GENERIC_ALLOCATOR
176 help
177 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
178 PAMU can authorize memory access, remap the memory address, and remap I/O
179 transaction types.
180
181# MSM IOMMU support
182config MSM_IOMMU
183 bool "MSM IOMMU Support"
184 depends on ARM
185 depends on ARCH_QCOM || COMPILE_TEST
186 select IOMMU_API
187 select IOMMU_IO_PGTABLE_ARMV7S
188 help
189 Support for the IOMMUs found on certain Qualcomm SOCs.
190 These IOMMUs allow virtualization of the address space used by most
191 cores within the multimedia subsystem.
192
193 If unsure, say N here.
194
195source "drivers/iommu/amd/Kconfig"
196source "drivers/iommu/intel/Kconfig"
197source "drivers/iommu/iommufd/Kconfig"
198source "drivers/iommu/riscv/Kconfig"
199
200config IRQ_REMAP
201 bool "Support for Interrupt Remapping"
202 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
203 select DMAR_TABLE if INTEL_IOMMU
204 help
205 Supports Interrupt remapping for IO-APIC and MSI devices.
206 To use x2apic mode in the CPU's which support x2APIC enhancements or
207 to support platforms with CPU's having > 8 bit APIC ID, say Y.
208
209# OMAP IOMMU support
210config OMAP_IOMMU
211 bool "OMAP IOMMU Support"
212 depends on ARCH_OMAP2PLUS || COMPILE_TEST
213 select IOMMU_API
214 help
215 The OMAP3 media platform drivers depend on iommu support,
216 if you need them say Y here.
217
218config OMAP_IOMMU_DEBUG
219 bool "Export OMAP IOMMU internals in DebugFS"
220 depends on OMAP_IOMMU && DEBUG_FS
221 help
222 Select this to see extensive information about
223 the internal state of OMAP IOMMU in debugfs.
224
225 Say N unless you know you need this.
226
227config ROCKCHIP_IOMMU
228 bool "Rockchip IOMMU Support"
229 depends on ARCH_ROCKCHIP || COMPILE_TEST
230 select IOMMU_API
231 select ARM_DMA_USE_IOMMU
232 help
233 Support for IOMMUs found on Rockchip rk32xx SOCs.
234 These IOMMUs allow virtualization of the address space used by most
235 cores within the multimedia subsystem.
236 Say Y here if you are using a Rockchip SoC that includes an IOMMU
237 device.
238
239config SUN50I_IOMMU
240 bool "Allwinner H6 IOMMU Support"
241 depends on HAS_DMA
242 depends on ARCH_SUNXI || COMPILE_TEST
243 select ARM_DMA_USE_IOMMU
244 select IOMMU_API
245 help
246 Support for the IOMMU introduced in the Allwinner H6 SoCs.
247
248config TEGRA_IOMMU_SMMU
249 bool "NVIDIA Tegra SMMU Support"
250 depends on ARCH_TEGRA
251 depends on TEGRA_AHB
252 depends on TEGRA_MC
253 select IOMMU_API
254 help
255 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
256 SoCs (Tegra30 up to Tegra210).
257
258config EXYNOS_IOMMU
259 bool "Exynos IOMMU Support"
260 depends on ARCH_EXYNOS || COMPILE_TEST
261 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
262 select IOMMU_API
263 select ARM_DMA_USE_IOMMU
264 help
265 Support for the IOMMU (System MMU) of Samsung Exynos application
266 processor family. This enables H/W multimedia accelerators to see
267 non-linear physical memory chunks as linear memory in their
268 address space.
269
270 If unsure, say N here.
271
272config EXYNOS_IOMMU_DEBUG
273 bool "Debugging log for Exynos IOMMU"
274 depends on EXYNOS_IOMMU
275 help
276 Select this to see the detailed log message that shows what
277 happens in the IOMMU driver.
278
279 Say N unless you need kernel log message for IOMMU debugging.
280
281config IPMMU_VMSA
282 bool "Renesas VMSA-compatible IPMMU"
283 depends on ARCH_RENESAS || COMPILE_TEST
284 depends on ARM || ARM64 || COMPILE_TEST
285 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
286 select IOMMU_API
287 select IOMMU_IO_PGTABLE_LPAE
288 select ARM_DMA_USE_IOMMU
289 help
290 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
291 APE6, R-Car Gen{2,3} and RZ/G{1,2} SoCs.
292
293 If unsure, say N.
294
295config SPAPR_TCE_IOMMU
296 bool "sPAPR TCE IOMMU Support"
297 depends on PPC_POWERNV || PPC_PSERIES
298 select IOMMU_API
299 help
300 Enables bits of IOMMU API required by VFIO. The iommu_ops
301 is not implemented as it is not necessary for VFIO.
302
303config APPLE_DART
304 tristate "Apple DART IOMMU Support"
305 depends on ARCH_APPLE || COMPILE_TEST
306 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART
307 select IOMMU_API
308 select IOMMU_IO_PGTABLE_DART
309 default ARCH_APPLE
310 help
311 Support for Apple DART (Device Address Resolution Table) IOMMUs
312 found in Apple ARM SoCs like the M1.
313 This IOMMU is required for most peripherals using DMA to access
314 the main memory.
315
316 Say Y here if you are using an Apple SoC.
317
318# ARM IOMMU support
319config ARM_SMMU
320 tristate "ARM Ltd. System MMU (SMMU) Support"
321 depends on ARM64 || ARM || COMPILE_TEST
322 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
323 select IOMMU_API
324 select IOMMU_IO_PGTABLE_LPAE
325 select ARM_DMA_USE_IOMMU if ARM
326 help
327 Support for implementations of the ARM System MMU architecture
328 versions 1 and 2.
329
330 Say Y here if your SoC includes an IOMMU device implementing
331 the ARM SMMU architecture.
332
333config ARM_SMMU_LEGACY_DT_BINDINGS
334 bool "Support the legacy \"mmu-masters\" devicetree bindings"
335 depends on ARM_SMMU=y && OF
336 help
337 Support for the badly designed and deprecated "mmu-masters"
338 devicetree bindings. This allows some DMA masters to attach
339 to the SMMU but does not provide any support via the DMA API.
340 If you're lucky, you might be able to get VFIO up and running.
341
342 If you say Y here then you'll make me very sad. Instead, say N
343 and move your firmware to the utopian future that was 2016.
344
345config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
346 bool "Default to disabling bypass on ARM SMMU v1 and v2"
347 depends on ARM_SMMU
348 default y
349 help
350 Say Y here to (by default) disable bypass streams such that
351 incoming transactions from devices that are not attached to
352 an iommu domain will report an abort back to the device and
353 will not be allowed to pass through the SMMU.
354
355 Any old kernels that existed before this KConfig was
356 introduced would default to _allowing_ bypass (AKA the
357 equivalent of NO for this config). However the default for
358 this option is YES because the old behavior is insecure.
359
360 There are few reasons to allow unmatched stream bypass, and
361 even fewer good ones. If saying YES here breaks your board
362 you should work on fixing your board. This KConfig option
363 is expected to be removed in the future and we'll simply
364 hardcode the bypass disable in the code.
365
366 NOTE: the kernel command line parameter
367 'arm-smmu.disable_bypass' will continue to override this
368 config.
369
370config ARM_SMMU_QCOM
371 def_tristate y
372 depends on ARM_SMMU && ARCH_QCOM
373 select QCOM_SCM
374 help
375 When running on a Qualcomm platform that has the custom variant
376 of the ARM SMMU, this needs to be built into the SMMU driver.
377
378config ARM_SMMU_QCOM_DEBUG
379 bool "ARM SMMU QCOM implementation defined debug support"
380 depends on ARM_SMMU_QCOM=y
381 help
382 Support for implementation specific debug features in ARM SMMU
383 hardware found in QTI platforms. This include support for
384 the Translation Buffer Units (TBU) that can be used to obtain
385 additional information when debugging memory management issues
386 like context faults.
387
388 Say Y here to enable debug for issues such as context faults
389 or TLB sync timeouts which requires implementation defined
390 register dumps.
391
392config ARM_SMMU_V3
393 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
394 depends on ARM64
395 select IOMMU_API
396 select IOMMU_IO_PGTABLE_LPAE
397 select GENERIC_MSI_IRQ
398 select IOMMUFD_DRIVER if IOMMUFD
399 help
400 Support for implementations of the ARM System MMU architecture
401 version 3 providing translation support to a PCIe root complex.
402
403 Say Y here if your system includes an IOMMU device implementing
404 the ARM SMMUv3 architecture.
405
406if ARM_SMMU_V3
407config ARM_SMMU_V3_SVA
408 bool "Shared Virtual Addressing support for the ARM SMMUv3"
409 select IOMMU_SVA
410 select IOMMU_IOPF
411 select MMU_NOTIFIER
412 help
413 Support for sharing process address spaces with devices using the
414 SMMUv3.
415
416 Say Y here if your system supports SVA extensions such as PCIe PASID
417 and PRI.
418
419config ARM_SMMU_V3_IOMMUFD
420 bool "Enable IOMMUFD features for ARM SMMUv3 (EXPERIMENTAL)"
421 depends on IOMMUFD
422 help
423 Support for IOMMUFD features intended to support virtual machines
424 with accelerated virtual IOMMUs.
425
426 Say Y here if you are doing development and testing on this feature.
427
428config ARM_SMMU_V3_KUNIT_TEST
429 tristate "KUnit tests for arm-smmu-v3 driver" if !KUNIT_ALL_TESTS
430 depends on KUNIT
431 depends on ARM_SMMU_V3_SVA
432 default KUNIT_ALL_TESTS
433 help
434 Enable this option to unit-test arm-smmu-v3 driver functions.
435
436 If unsure, say N.
437
438config TEGRA241_CMDQV
439 bool "NVIDIA Tegra241 CMDQ-V extension support for ARM SMMUv3"
440 depends on ACPI
441 help
442 Support for NVIDIA CMDQ-Virtualization extension for ARM SMMUv3. The
443 CMDQ-V extension is similar to v3.3 ECMDQ for multi command queues
444 support, except with virtualization capabilities.
445
446 Say Y here if your system is NVIDIA Tegra241 (Grace) or it has the same
447 CMDQ-V extension.
448endif
449
450config S390_IOMMU
451 def_bool y if S390 && PCI
452 depends on S390 && PCI
453 select IOMMU_API
454 help
455 Support for the IOMMU API for s390 PCI devices.
456
457config MTK_IOMMU
458 tristate "MediaTek IOMMU Support"
459 depends on ARCH_MEDIATEK || COMPILE_TEST
460 select ARM_DMA_USE_IOMMU
461 select IOMMU_API
462 select IOMMU_IO_PGTABLE_ARMV7S
463 select MEMORY
464 select MTK_SMI
465 help
466 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
467 Memory Management Unit. This option enables remapping of DMA memory
468 accesses for the multimedia subsystem.
469
470 If unsure, say N here.
471
472config MTK_IOMMU_V1
473 tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
474 depends on ARM
475 depends on ARCH_MEDIATEK || COMPILE_TEST
476 select ARM_DMA_USE_IOMMU
477 select IOMMU_API
478 select MEMORY
479 select MTK_SMI
480 help
481 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
482 Multimedia Memory Managememt Unit. This option enables remapping of
483 DMA memory accesses for the multimedia subsystem.
484
485 if unsure, say N here.
486
487config QCOM_IOMMU
488 # Note: iommu drivers cannot (yet?) be built as modules
489 bool "Qualcomm IOMMU Support"
490 depends on ARCH_QCOM || COMPILE_TEST
491 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
492 select QCOM_SCM
493 select IOMMU_API
494 select IOMMU_IO_PGTABLE_LPAE
495 select ARM_DMA_USE_IOMMU
496 help
497 Support for IOMMU on certain Qualcomm SoCs.
498
499config HYPERV_IOMMU
500 bool "Hyper-V IRQ Handling"
501 depends on HYPERV && X86
502 select IOMMU_API
503 default HYPERV
504 help
505 Stub IOMMU driver to handle IRQs to support Hyper-V Linux
506 guest and root partitions.
507
508config VIRTIO_IOMMU
509 tristate "Virtio IOMMU driver"
510 depends on VIRTIO
511 depends on (ARM64 || X86)
512 select IOMMU_API
513 select INTERVAL_TREE
514 select ACPI_VIOT if ACPI
515 help
516 Para-virtualised IOMMU driver with virtio.
517
518 Say Y here if you intend to run this kernel as a guest.
519
520config SPRD_IOMMU
521 tristate "Unisoc IOMMU Support"
522 depends on ARCH_SPRD || COMPILE_TEST
523 select IOMMU_API
524 help
525 Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by
526 Unisoc's multimedia devices, such as display, Image codec(jpeg)
527 and a few signal processors, including VSP(video), GSP(graphic),
528 ISP(image), and CPP(camera pixel processor), etc.
529
530 Say Y here if you want to use the multimedia devices listed above.
531
532endif # IOMMU_SUPPORT
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# The IOASID library may also be used by non-IOMMU_API users
7config IOASID
8 tristate
9
10# IOMMU_API always gets selected by whoever wants it.
11config IOMMU_API
12 bool
13
14menuconfig IOMMU_SUPPORT
15 bool "IOMMU Hardware Support"
16 depends on MMU
17 default y
18 help
19 Say Y here if you want to compile device drivers for IO Memory
20 Management Units into the kernel. These devices usually allow to
21 remap DMA requests and/or remap interrupts from other devices on the
22 system.
23
24if IOMMU_SUPPORT
25
26menu "Generic IOMMU Pagetable Support"
27
28# Selected by the actual pagetable implementations
29config IOMMU_IO_PGTABLE
30 bool
31
32config IOMMU_IO_PGTABLE_LPAE
33 bool "ARMv7/v8 Long Descriptor Format"
34 select IOMMU_IO_PGTABLE
35 depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
36 help
37 Enable support for the ARM long descriptor pagetable format.
38 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
39 sizes at both stage-1 and stage-2, as well as address spaces
40 up to 48-bits in size.
41
42config IOMMU_IO_PGTABLE_LPAE_SELFTEST
43 bool "LPAE selftests"
44 depends on IOMMU_IO_PGTABLE_LPAE
45 help
46 Enable self-tests for LPAE page table allocator. This performs
47 a series of page-table consistency checks during boot.
48
49 If unsure, say N here.
50
51config IOMMU_IO_PGTABLE_ARMV7S
52 bool "ARMv7/v8 Short Descriptor Format"
53 select IOMMU_IO_PGTABLE
54 depends on ARM || ARM64 || COMPILE_TEST
55 help
56 Enable support for the ARM Short-descriptor pagetable format.
57 This supports 32-bit virtual and physical addresses mapped using
58 2-level tables with 4KB pages/1MB sections, and contiguous entries
59 for 64KB pages/16MB supersections if indicated by the IOMMU driver.
60
61config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
62 bool "ARMv7s selftests"
63 depends on IOMMU_IO_PGTABLE_ARMV7S
64 help
65 Enable self-tests for ARMv7s page table allocator. This performs
66 a series of page-table consistency checks during boot.
67
68 If unsure, say N here.
69
70config IOMMU_IO_PGTABLE_DART
71 bool "Apple DART Formats"
72 select IOMMU_IO_PGTABLE
73 depends on ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
74 help
75 Enable support for the Apple DART pagetable formats. These include
76 the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
77 SoCs.
78
79 If unsure, say N here.
80
81endmenu
82
83config IOMMU_DEBUGFS
84 bool "Export IOMMU internals in DebugFS"
85 depends on DEBUG_FS
86 help
87 Allows exposure of IOMMU device internals. This option enables
88 the use of debugfs by IOMMU drivers as required. Devices can,
89 at initialization time, cause the IOMMU code to create a top-level
90 debug/iommu directory, and then populate a subdirectory with
91 entries as required.
92
93choice
94 prompt "IOMMU default domain type"
95 depends on IOMMU_API
96 default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64
97 default IOMMU_DEFAULT_DMA_STRICT
98 help
99 Choose the type of IOMMU domain used to manage DMA API usage by
100 device drivers. The options here typically represent different
101 levels of tradeoff between robustness/security and performance,
102 depending on the IOMMU driver. Not all IOMMUs support all options.
103 This choice can be overridden at boot via the command line, and for
104 some devices also at runtime via sysfs.
105
106 If unsure, keep the default.
107
108config IOMMU_DEFAULT_DMA_STRICT
109 bool "Translated - Strict"
110 help
111 Trusted devices use translation to restrict their access to only
112 DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent
113 to passing "iommu.passthrough=0 iommu.strict=1" on the command line.
114
115 Untrusted devices always use this mode, with an additional layer of
116 bounce-buffering such that they cannot gain access to any unrelated
117 data within a mapped page.
118
119config IOMMU_DEFAULT_DMA_LAZY
120 bool "Translated - Lazy"
121 help
122 Trusted devices use translation to restrict their access to only
123 DMA-mapped pages, but with "lazy" batched TLB invalidation. This
124 mode allows higher performance with some IOMMUs due to reduced TLB
125 flushing, but at the cost of reduced isolation since devices may be
126 able to access memory for some time after it has been unmapped.
127 Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the
128 command line.
129
130 If this mode is not supported by the IOMMU driver, the effective
131 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
132
133config IOMMU_DEFAULT_PASSTHROUGH
134 bool "Passthrough"
135 help
136 Trusted devices are identity-mapped, giving them unrestricted access
137 to memory with minimal performance overhead. Equivalent to passing
138 "iommu.passthrough=1" (historically "iommu=pt") on the command line.
139
140 If this mode is not supported by the IOMMU driver, the effective
141 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
142
143endchoice
144
145config OF_IOMMU
146 def_bool y
147 depends on OF && IOMMU_API
148
149# IOMMU-agnostic DMA-mapping layer
150config IOMMU_DMA
151 def_bool ARM64 || IA64 || X86
152 select DMA_OPS
153 select IOMMU_API
154 select IOMMU_IOVA
155 select IRQ_MSI_IOMMU
156 select NEED_SG_DMA_LENGTH
157
158# Shared Virtual Addressing
159config IOMMU_SVA
160 bool
161 select IOASID
162
163config FSL_PAMU
164 bool "Freescale IOMMU support"
165 depends on PCI
166 depends on PHYS_64BIT
167 depends on PPC_E500MC || (COMPILE_TEST && PPC)
168 select IOMMU_API
169 select GENERIC_ALLOCATOR
170 help
171 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
172 PAMU can authorize memory access, remap the memory address, and remap I/O
173 transaction types.
174
175# MSM IOMMU support
176config MSM_IOMMU
177 bool "MSM IOMMU Support"
178 depends on ARM
179 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
180 select IOMMU_API
181 select IOMMU_IO_PGTABLE_ARMV7S
182 help
183 Support for the IOMMUs found on certain Qualcomm SOCs.
184 These IOMMUs allow virtualization of the address space used by most
185 cores within the multimedia subsystem.
186
187 If unsure, say N here.
188
189source "drivers/iommu/amd/Kconfig"
190source "drivers/iommu/intel/Kconfig"
191source "drivers/iommu/iommufd/Kconfig"
192
193config IRQ_REMAP
194 bool "Support for Interrupt Remapping"
195 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
196 select DMAR_TABLE
197 help
198 Supports Interrupt remapping for IO-APIC and MSI devices.
199 To use x2apic mode in the CPU's which support x2APIC enhancements or
200 to support platforms with CPU's having > 8 bit APIC ID, say Y.
201
202# OMAP IOMMU support
203config OMAP_IOMMU
204 bool "OMAP IOMMU Support"
205 depends on ARCH_OMAP2PLUS || COMPILE_TEST
206 select IOMMU_API
207 help
208 The OMAP3 media platform drivers depend on iommu support,
209 if you need them say Y here.
210
211config OMAP_IOMMU_DEBUG
212 bool "Export OMAP IOMMU internals in DebugFS"
213 depends on OMAP_IOMMU && DEBUG_FS
214 help
215 Select this to see extensive information about
216 the internal state of OMAP IOMMU in debugfs.
217
218 Say N unless you know you need this.
219
220config ROCKCHIP_IOMMU
221 bool "Rockchip IOMMU Support"
222 depends on ARCH_ROCKCHIP || COMPILE_TEST
223 select IOMMU_API
224 select ARM_DMA_USE_IOMMU
225 help
226 Support for IOMMUs found on Rockchip rk32xx SOCs.
227 These IOMMUs allow virtualization of the address space used by most
228 cores within the multimedia subsystem.
229 Say Y here if you are using a Rockchip SoC that includes an IOMMU
230 device.
231
232config SUN50I_IOMMU
233 bool "Allwinner H6 IOMMU Support"
234 depends on HAS_DMA
235 depends on ARCH_SUNXI || COMPILE_TEST
236 select ARM_DMA_USE_IOMMU
237 select IOMMU_API
238 help
239 Support for the IOMMU introduced in the Allwinner H6 SoCs.
240
241config TEGRA_IOMMU_GART
242 bool "Tegra GART IOMMU Support"
243 depends on ARCH_TEGRA_2x_SOC
244 depends on TEGRA_MC
245 select IOMMU_API
246 help
247 Enables support for remapping discontiguous physical memory
248 shared with the operating system into contiguous I/O virtual
249 space through the GART (Graphics Address Relocation Table)
250 hardware included on Tegra SoCs.
251
252config TEGRA_IOMMU_SMMU
253 bool "NVIDIA Tegra SMMU Support"
254 depends on ARCH_TEGRA
255 depends on TEGRA_AHB
256 depends on TEGRA_MC
257 select IOMMU_API
258 help
259 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
260 SoCs (Tegra30 up to Tegra210).
261
262config EXYNOS_IOMMU
263 bool "Exynos IOMMU Support"
264 depends on ARCH_EXYNOS || COMPILE_TEST
265 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
266 select IOMMU_API
267 select ARM_DMA_USE_IOMMU
268 help
269 Support for the IOMMU (System MMU) of Samsung Exynos application
270 processor family. This enables H/W multimedia accelerators to see
271 non-linear physical memory chunks as linear memory in their
272 address space.
273
274 If unsure, say N here.
275
276config EXYNOS_IOMMU_DEBUG
277 bool "Debugging log for Exynos IOMMU"
278 depends on EXYNOS_IOMMU
279 help
280 Select this to see the detailed log message that shows what
281 happens in the IOMMU driver.
282
283 Say N unless you need kernel log message for IOMMU debugging.
284
285config IPMMU_VMSA
286 bool "Renesas VMSA-compatible IPMMU"
287 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
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 && !GENERIC_ATOMIC64)
308 select IOMMU_API
309 select IOMMU_IO_PGTABLE_DART
310 default ARCH_APPLE
311 help
312 Support for Apple DART (Device Address Resolution Table) IOMMUs
313 found in Apple ARM SoCs like the M1.
314 This IOMMU is required for most peripherals using DMA to access
315 the main memory.
316
317 Say Y here if you are using an Apple SoC.
318
319# ARM IOMMU support
320config ARM_SMMU
321 tristate "ARM Ltd. System MMU (SMMU) Support"
322 depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
323 select IOMMU_API
324 select IOMMU_IO_PGTABLE_LPAE
325 select ARM_DMA_USE_IOMMU if ARM
326 help
327 Support for implementations of the ARM System MMU architecture
328 versions 1 and 2.
329
330 Say Y here if your SoC includes an IOMMU device implementing
331 the ARM SMMU architecture.
332
333config ARM_SMMU_LEGACY_DT_BINDINGS
334 bool "Support the legacy \"mmu-masters\" devicetree bindings"
335 depends on ARM_SMMU=y && OF
336 help
337 Support for the badly designed and deprecated "mmu-masters"
338 devicetree bindings. This allows some DMA masters to attach
339 to the SMMU but does not provide any support via the DMA API.
340 If you're lucky, you might be able to get VFIO up and running.
341
342 If you say Y here then you'll make me very sad. Instead, say N
343 and move your firmware to the utopian future that was 2016.
344
345config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
346 bool "Default to disabling bypass on ARM SMMU v1 and v2"
347 depends on ARM_SMMU
348 default y
349 help
350 Say Y here to (by default) disable bypass streams such that
351 incoming transactions from devices that are not attached to
352 an iommu domain will report an abort back to the device and
353 will not be allowed to pass through the SMMU.
354
355 Any old kernels that existed before this KConfig was
356 introduced would default to _allowing_ bypass (AKA the
357 equivalent of NO for this config). However the default for
358 this option is YES because the old behavior is insecure.
359
360 There are few reasons to allow unmatched stream bypass, and
361 even fewer good ones. If saying YES here breaks your board
362 you should work on fixing your board. This KConfig option
363 is expected to be removed in the future and we'll simply
364 hardcode the bypass disable in the code.
365
366 NOTE: the kernel command line parameter
367 'arm-smmu.disable_bypass' will continue to override this
368 config.
369
370config ARM_SMMU_QCOM
371 def_tristate y
372 depends on ARM_SMMU && ARCH_QCOM
373 select QCOM_SCM
374 help
375 When running on a Qualcomm platform that has the custom variant
376 of the ARM SMMU, this needs to be built into the SMMU driver.
377
378config ARM_SMMU_QCOM_DEBUG
379 bool "ARM SMMU QCOM implementation defined debug support"
380 depends on ARM_SMMU_QCOM
381 help
382 Support for implementation specific debug features in ARM SMMU
383 hardware found in QTI platforms.
384
385 Say Y here to enable debug for issues such as TLB sync timeouts
386 which requires implementation defined register dumps.
387
388config ARM_SMMU_V3
389 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
390 depends on ARM64
391 select IOMMU_API
392 select IOMMU_IO_PGTABLE_LPAE
393 select GENERIC_MSI_IRQ
394 help
395 Support for implementations of the ARM System MMU architecture
396 version 3 providing translation support to a PCIe root complex.
397
398 Say Y here if your system includes an IOMMU device implementing
399 the ARM SMMUv3 architecture.
400
401config ARM_SMMU_V3_SVA
402 bool "Shared Virtual Addressing support for the ARM SMMUv3"
403 depends on ARM_SMMU_V3
404 select IOMMU_SVA
405 select MMU_NOTIFIER
406 help
407 Support for sharing process address spaces with devices using the
408 SMMUv3.
409
410 Say Y here if your system supports SVA extensions such as PCIe PASID
411 and PRI.
412
413config S390_IOMMU
414 def_bool y if S390 && PCI
415 depends on S390 && PCI
416 select IOMMU_API
417 help
418 Support for the IOMMU API for s390 PCI devices.
419
420config S390_CCW_IOMMU
421 bool "S390 CCW IOMMU Support"
422 depends on S390 && CCW || COMPILE_TEST
423 select IOMMU_API
424 help
425 Enables bits of IOMMU API required by VFIO. The iommu_ops
426 is not implemented as it is not necessary for VFIO.
427
428config S390_AP_IOMMU
429 bool "S390 AP IOMMU Support"
430 depends on S390 && ZCRYPT || COMPILE_TEST
431 select IOMMU_API
432 help
433 Enables bits of IOMMU API required by VFIO. The iommu_ops
434 is not implemented as it is not necessary for VFIO.
435
436config MTK_IOMMU
437 tristate "MediaTek IOMMU Support"
438 depends on ARCH_MEDIATEK || COMPILE_TEST
439 select ARM_DMA_USE_IOMMU
440 select IOMMU_API
441 select IOMMU_IO_PGTABLE_ARMV7S
442 select MEMORY
443 select MTK_SMI
444 help
445 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
446 Memory Management Unit. This option enables remapping of DMA memory
447 accesses for the multimedia subsystem.
448
449 If unsure, say N here.
450
451config MTK_IOMMU_V1
452 tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
453 depends on ARM
454 depends on ARCH_MEDIATEK || COMPILE_TEST
455 select ARM_DMA_USE_IOMMU
456 select IOMMU_API
457 select MEMORY
458 select MTK_SMI
459 help
460 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
461 Multimedia Memory Managememt Unit. This option enables remapping of
462 DMA memory accesses for the multimedia subsystem.
463
464 if unsure, say N here.
465
466config QCOM_IOMMU
467 # Note: iommu drivers cannot (yet?) be built as modules
468 bool "Qualcomm IOMMU Support"
469 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
470 select QCOM_SCM
471 select IOMMU_API
472 select IOMMU_IO_PGTABLE_LPAE
473 select ARM_DMA_USE_IOMMU
474 help
475 Support for IOMMU on certain Qualcomm SoCs.
476
477config HYPERV_IOMMU
478 bool "Hyper-V IRQ Handling"
479 depends on HYPERV && X86
480 select IOMMU_API
481 default HYPERV
482 help
483 Stub IOMMU driver to handle IRQs to support Hyper-V Linux
484 guest and root partitions.
485
486config VIRTIO_IOMMU
487 tristate "Virtio IOMMU driver"
488 depends on VIRTIO
489 depends on (ARM64 || X86)
490 select IOMMU_API
491 select INTERVAL_TREE
492 select ACPI_VIOT if ACPI
493 help
494 Para-virtualised IOMMU driver with virtio.
495
496 Say Y here if you intend to run this kernel as a guest.
497
498config SPRD_IOMMU
499 tristate "Unisoc IOMMU Support"
500 depends on ARCH_SPRD || COMPILE_TEST
501 select IOMMU_API
502 help
503 Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by
504 Unisoc's multimedia devices, such as display, Image codec(jpeg)
505 and a few signal processors, including VSP(video), GSP(graphic),
506 ISP(image), and CPP(camera pixel processor), etc.
507
508 Say Y here if you want to use the multimedia devices listed above.
509
510endif # IOMMU_SUPPORT