1 # SPDX-License-Identifier: GPL-2.0-only
2 # The IOVA library may also be used by non-IOMMU_API users
6 # IOMMU_API always gets selected by whoever wants it.
14 menuconfig IOMMU_SUPPORT
15 bool "IOMMU Hardware Support"
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
26 menu "Generic IOMMU Pagetable Support"
28 # Selected by the actual pagetable implementations
29 config IOMMU_IO_PGTABLE
32 config 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()
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.
43 config IOMMU_IO_PGTABLE_LPAE_SELFTEST
45 depends on IOMMU_IO_PGTABLE_LPAE
47 Enable self-tests for LPAE page table allocator. This performs
48 a series of page-table consistency checks during boot.
50 If unsure, say N here.
52 config IOMMU_IO_PGTABLE_ARMV7S
53 bool "ARMv7/v8 Short Descriptor Format"
54 select IOMMU_IO_PGTABLE
55 depends on ARM || ARM64 || COMPILE_TEST
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.
62 config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
63 bool "ARMv7s selftests"
64 depends on IOMMU_IO_PGTABLE_ARMV7S
66 Enable self-tests for ARMv7s page table allocator. This performs
67 a series of page-table consistency checks during boot.
69 If unsure, say N here.
71 config 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()
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
81 If unsure, say N here.
86 bool "Export IOMMU internals in DebugFS"
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
96 prompt "IOMMU default domain type"
98 default IOMMU_DEFAULT_DMA_LAZY if X86 || S390
99 default IOMMU_DEFAULT_DMA_STRICT
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.
108 If unsure, keep the default.
110 config IOMMU_DEFAULT_DMA_STRICT
111 bool "Translated - Strict"
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.
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.
121 config IOMMU_DEFAULT_DMA_LAZY
122 bool "Translated - Lazy"
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
132 If this mode is not supported by the IOMMU driver, the effective
133 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
135 config IOMMU_DEFAULT_PASSTHROUGH
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.
142 If this mode is not supported by the IOMMU driver, the effective
143 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
149 depends on OF && IOMMU_API
151 # IOMMU-agnostic DMA-mapping layer
153 def_bool ARM64 || X86 || S390
154 select DMA_OPS_HELPERS
158 select NEED_SG_DMA_LENGTH
159 select NEED_SG_DMA_FLAGS if SWIOTLB
161 # Shared Virtual Addressing
170 bool "Freescale IOMMU support"
172 depends on PHYS_64BIT
173 depends on PPC_E500MC || (COMPILE_TEST && PPC)
175 select GENERIC_ALLOCATOR
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
183 bool "MSM IOMMU Support"
185 depends on ARCH_QCOM || COMPILE_TEST
187 select IOMMU_IO_PGTABLE_ARMV7S
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.
193 If unsure, say N here.
195 source "drivers/iommu/amd/Kconfig"
196 source "drivers/iommu/intel/Kconfig"
197 source "drivers/iommu/iommufd/Kconfig"
198 source "drivers/iommu/riscv/Kconfig"
201 bool "Support for Interrupt Remapping"
202 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
203 select DMAR_TABLE if INTEL_IOMMU
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.
211 bool "OMAP IOMMU Support"
212 depends on ARCH_OMAP2PLUS || COMPILE_TEST
215 The OMAP3 media platform drivers depend on iommu support,
216 if you need them say Y here.
218 config OMAP_IOMMU_DEBUG
219 bool "Export OMAP IOMMU internals in DebugFS"
220 depends on OMAP_IOMMU && DEBUG_FS
222 Select this to see extensive information about
223 the internal state of OMAP IOMMU in debugfs.
225 Say N unless you know you need this.
227 config ROCKCHIP_IOMMU
228 bool "Rockchip IOMMU Support"
229 depends on ARCH_ROCKCHIP || COMPILE_TEST
231 select ARM_DMA_USE_IOMMU
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
240 bool "Allwinner H6 IOMMU Support"
242 depends on ARCH_SUNXI || COMPILE_TEST
243 select ARM_DMA_USE_IOMMU
246 Support for the IOMMU introduced in the Allwinner H6 SoCs.
248 config TEGRA_IOMMU_SMMU
249 bool "NVIDIA Tegra SMMU Support"
250 depends on ARCH_TEGRA
255 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
256 SoCs (Tegra30 up to Tegra210).
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
263 select ARM_DMA_USE_IOMMU
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
270 If unsure, say N here.
272 config EXYNOS_IOMMU_DEBUG
273 bool "Debugging log for Exynos IOMMU"
274 depends on EXYNOS_IOMMU
276 Select this to see the detailed log message that shows what
277 happens in the IOMMU driver.
279 Say N unless you need kernel log message for IOMMU debugging.
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
287 select IOMMU_IO_PGTABLE_LPAE
288 select ARM_DMA_USE_IOMMU
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.
295 config SPAPR_TCE_IOMMU
296 bool "sPAPR TCE IOMMU Support"
297 depends on PPC_POWERNV || PPC_PSERIES
300 Enables bits of IOMMU API required by VFIO. The iommu_ops
301 is not implemented as it is not necessary for VFIO.
304 tristate "Apple DART IOMMU Support"
305 depends on ARCH_APPLE || COMPILE_TEST
306 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART
308 select IOMMU_IO_PGTABLE_DART
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
316 Say Y here if you are using an Apple SoC.
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
324 select IOMMU_IO_PGTABLE_LPAE
325 select ARM_DMA_USE_IOMMU if ARM
327 Support for implementations of the ARM System MMU architecture
330 Say Y here if your SoC includes an IOMMU device implementing
331 the ARM SMMU architecture.
333 config ARM_SMMU_LEGACY_DT_BINDINGS
334 bool "Support the legacy \"mmu-masters\" devicetree bindings"
335 depends on ARM_SMMU=y && OF
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.
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.
345 config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
346 bool "Default to disabling bypass on ARM SMMU v1 and v2"
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.
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.
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.
366 NOTE: the kernel command line parameter
367 'arm-smmu.disable_bypass' will continue to override this
372 depends on ARM_SMMU && ARCH_QCOM
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.
378 config ARM_SMMU_QCOM_DEBUG
379 bool "ARM SMMU QCOM implementation defined debug support"
380 depends on ARM_SMMU_QCOM=y
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
388 Say Y here to enable debug for issues such as context faults
389 or TLB sync timeouts which requires implementation defined
393 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
396 select IOMMU_IO_PGTABLE_LPAE
397 select GENERIC_MSI_IRQ
398 select IOMMUFD_DRIVER if IOMMUFD
400 Support for implementations of the ARM System MMU architecture
401 version 3 providing translation support to a PCIe root complex.
403 Say Y here if your system includes an IOMMU device implementing
404 the ARM SMMUv3 architecture.
407 config ARM_SMMU_V3_SVA
408 bool "Shared Virtual Addressing support for the ARM SMMUv3"
413 Support for sharing process address spaces with devices using the
416 Say Y here if your system supports SVA extensions such as PCIe PASID
419 config ARM_SMMU_V3_IOMMUFD
420 bool "Enable IOMMUFD features for ARM SMMUv3 (EXPERIMENTAL)"
423 Support for IOMMUFD features intended to support virtual machines
424 with accelerated virtual IOMMUs.
426 Say Y here if you are doing development and testing on this feature.
428 config ARM_SMMU_V3_KUNIT_TEST
429 tristate "KUnit tests for arm-smmu-v3 driver" if !KUNIT_ALL_TESTS
431 depends on ARM_SMMU_V3_SVA
432 default KUNIT_ALL_TESTS
434 Enable this option to unit-test arm-smmu-v3 driver functions.
438 config TEGRA241_CMDQV
439 bool "NVIDIA Tegra241 CMDQ-V extension support for ARM SMMUv3"
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.
446 Say Y here if your system is NVIDIA Tegra241 (Grace) or it has the same
451 def_bool y if S390 && PCI
452 depends on S390 && PCI
455 Support for the IOMMU API for s390 PCI devices.
458 tristate "MediaTek IOMMU Support"
459 depends on ARCH_MEDIATEK || COMPILE_TEST
460 select ARM_DMA_USE_IOMMU
462 select IOMMU_IO_PGTABLE_ARMV7S
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.
470 If unsure, say N here.
473 tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
475 depends on ARCH_MEDIATEK || COMPILE_TEST
476 select ARM_DMA_USE_IOMMU
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.
485 if unsure, say N here.
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
494 select IOMMU_IO_PGTABLE_LPAE
495 select ARM_DMA_USE_IOMMU
497 Support for IOMMU on certain Qualcomm SoCs.
500 bool "Hyper-V IRQ Handling"
501 depends on HYPERV && X86
505 Stub IOMMU driver to handle IRQs to support Hyper-V Linux
506 guest and root partitions.
509 tristate "Virtio IOMMU driver"
511 depends on (ARM64 || X86)
514 select ACPI_VIOT if ACPI
516 Para-virtualised IOMMU driver with virtio.
518 Say Y here if you intend to run this kernel as a guest.
521 tristate "Unisoc IOMMU Support"
522 depends on ARCH_SPRD || COMPILE_TEST
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.
530 Say Y here if you want to use the multimedia devices listed above.
532 endif # IOMMU_SUPPORT