1 # SPDX-License-Identifier: GPL-2.0-only
2 # The IOVA library may also be used by non-IOMMU_API users
6 # The IOASID library may also be used by non-IOMMU_API users
10 # 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 && !GENERIC_ATOMIC64)
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.
42 config IOMMU_IO_PGTABLE_LPAE_SELFTEST
44 depends on IOMMU_IO_PGTABLE_LPAE
46 Enable self-tests for LPAE page table allocator. This performs
47 a series of page-table consistency checks during boot.
49 If unsure, say N here.
51 config IOMMU_IO_PGTABLE_ARMV7S
52 bool "ARMv7/v8 Short Descriptor Format"
53 select IOMMU_IO_PGTABLE
54 depends on ARM || ARM64 || COMPILE_TEST
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.
61 config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
62 bool "ARMv7s selftests"
63 depends on IOMMU_IO_PGTABLE_ARMV7S
65 Enable self-tests for ARMv7s page table allocator. This performs
66 a series of page-table consistency checks during boot.
68 If unsure, say N here.
73 bool "Export IOMMU internals in DebugFS"
76 Allows exposure of IOMMU device internals. This option enables
77 the use of debugfs by IOMMU drivers as required. Devices can,
78 at initialization time, cause the IOMMU code to create a top-level
79 debug/iommu directory, and then populate a subdirectory with
82 config IOMMU_DEFAULT_PASSTHROUGH
83 bool "IOMMU passthrough by default"
86 Enable passthrough by default, removing the need to pass in
87 iommu.passthrough=on or iommu=pt through command line. If this
88 is enabled, you can still disable with iommu.passthrough=off
89 or iommu=nopt depending on the architecture.
91 If unsure, say N here.
95 depends on OF && IOMMU_API
97 # IOMMU-agnostic DMA-mapping layer
103 select NEED_SG_DMA_LENGTH
106 bool "Freescale IOMMU support"
108 depends on PHYS_64BIT
109 depends on PPC_E500MC || (COMPILE_TEST && PPC)
111 select GENERIC_ALLOCATOR
113 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
114 PAMU can authorize memory access, remap the memory address, and remap I/O
119 bool "MSM IOMMU Support"
121 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
123 select IOMMU_IO_PGTABLE_ARMV7S
125 Support for the IOMMUs found on certain Qualcomm SOCs.
126 These IOMMUs allow virtualization of the address space used by most
127 cores within the multimedia subsystem.
129 If unsure, say N here.
131 config IOMMU_PGTABLES_L2
133 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
137 bool "AMD IOMMU support"
146 depends on X86_64 && PCI && ACPI
148 With this option you can enable support for AMD IOMMU hardware in
149 your system. An IOMMU is a hardware component which provides
150 remapping of DMA memory accesses from devices. With an AMD IOMMU you
151 can isolate the DMA memory of different devices and protect the
152 system from misbehaving device drivers or hardware.
154 You can find out if your system has an AMD IOMMU if you look into
155 your BIOS for an option to enable it or if you have an IVRS ACPI
159 tristate "AMD IOMMU Version 2 driver"
163 This option enables support for the AMD IOMMUv2 features of the IOMMU
164 hardware. Select this option if you want to use devices that support
165 the PCI PRI and PASID interface.
167 config AMD_IOMMU_DEBUGFS
168 bool "Enable AMD IOMMU internals in DebugFS"
169 depends on AMD_IOMMU && IOMMU_DEBUGFS
171 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!!
173 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
174 Exposes AMD IOMMU device internals in DebugFS.
176 This option is -NOT- intended for production environments, and should
177 not generally be enabled.
179 # Intel IOMMU support
184 bool "Support for Intel IOMMU using DMA Remapping Devices"
185 depends on PCI_MSI && ACPI && (X86 || IA64)
188 select NEED_DMA_MAP_STATE
193 DMA remapping (DMAR) devices support enables independent address
194 translations for Direct Memory Access (DMA) from devices.
195 These DMA remapping devices are reported via ACPI tables
196 and include PCI device scope covered by these DMA
199 config INTEL_IOMMU_DEBUGFS
200 bool "Export Intel IOMMU internals in Debugfs"
201 depends on INTEL_IOMMU && IOMMU_DEBUGFS
205 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
207 Expose Intel IOMMU internals in Debugfs.
209 This option is -NOT- intended for production environments, and should
210 only be enabled for debugging Intel IOMMU.
212 config INTEL_IOMMU_SVM
213 bool "Support for Shared Virtual Memory with Intel IOMMU"
214 depends on INTEL_IOMMU && X86_64
220 Shared Virtual Memory (SVM) provides a facility for devices
221 to access DMA resources through process address space by
222 means of a Process Address Space ID (PASID).
224 config INTEL_IOMMU_DEFAULT_ON
226 prompt "Enable Intel DMA Remapping Devices by default"
227 depends on INTEL_IOMMU
229 Selecting this option will enable a DMAR device at boot time if
230 one is found. If this option is not selected, DMAR support can
231 be enabled by passing intel_iommu=on to the kernel.
233 config INTEL_IOMMU_BROKEN_GFX_WA
234 bool "Workaround broken graphics drivers (going away soon)"
235 depends on INTEL_IOMMU && BROKEN && X86
237 Current Graphics drivers tend to use physical address
238 for DMA and avoid using DMA APIs. Setting this config
239 option permits the IOMMU driver to set a unity map for
240 all the OS-visible memory. Hence the driver can continue
241 to use physical addresses for DMA, at least until this
242 option is removed in the 2.6.32 kernel.
244 config INTEL_IOMMU_FLOPPY_WA
246 depends on INTEL_IOMMU && X86
248 Floppy disk drivers are known to bypass DMA API calls
249 thereby failing to work when IOMMU is enabled. This
250 workaround will setup a 1:1 mapping for the first
251 16MiB to make floppy (an ISA device) work.
253 config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
254 bool "Enable Intel IOMMU scalable mode by default"
255 depends on INTEL_IOMMU
257 Selecting this option will enable by default the scalable mode if
258 hardware presents the capability. The scalable mode is defined in
259 VT-d 3.0. The scalable mode capability could be checked by reading
260 /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option
261 is not selected, scalable mode support could also be enabled by
262 passing intel_iommu=sm_on to the kernel. If not sure, please use
266 bool "Support for Interrupt Remapping"
267 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
270 Supports Interrupt remapping for IO-APIC and MSI devices.
271 To use x2apic mode in the CPU's which support x2APIC enhancements or
272 to support platforms with CPU's having > 8 bit APIC ID, say Y.
276 bool "OMAP IOMMU Support"
277 depends on ARM && MMU || (COMPILE_TEST && (ARM || ARM64 || IA64 || SPARC))
278 depends on ARCH_OMAP2PLUS || COMPILE_TEST
281 The OMAP3 media platform drivers depend on iommu support,
282 if you need them say Y here.
284 config OMAP_IOMMU_DEBUG
285 bool "Export OMAP IOMMU internals in DebugFS"
286 depends on OMAP_IOMMU && DEBUG_FS
288 Select this to see extensive information about
289 the internal state of OMAP IOMMU in debugfs.
291 Say N unless you know you need this.
293 config ROCKCHIP_IOMMU
294 bool "Rockchip IOMMU Support"
295 depends on ARM || ARM64 || (COMPILE_TEST && (ARM64 || IA64 || SPARC))
296 depends on ARCH_ROCKCHIP || COMPILE_TEST
298 select ARM_DMA_USE_IOMMU
300 Support for IOMMUs found on Rockchip rk32xx SOCs.
301 These IOMMUs allow virtualization of the address space used by most
302 cores within the multimedia subsystem.
303 Say Y here if you are using a Rockchip SoC that includes an IOMMU
307 bool "Allwinner H6 IOMMU Support"
309 depends on ARCH_SUNXI || COMPILE_TEST
310 select ARM_DMA_USE_IOMMU
314 Support for the IOMMU introduced in the Allwinner H6 SoCs.
316 config TEGRA_IOMMU_GART
317 bool "Tegra GART IOMMU Support"
318 depends on ARCH_TEGRA_2x_SOC
322 Enables support for remapping discontiguous physical memory
323 shared with the operating system into contiguous I/O virtual
324 space through the GART (Graphics Address Relocation Table)
325 hardware included on Tegra SoCs.
327 config TEGRA_IOMMU_SMMU
328 bool "NVIDIA Tegra SMMU Support"
329 depends on ARCH_TEGRA
334 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
335 SoCs (Tegra30 up to Tegra210).
338 bool "Exynos IOMMU Support"
339 depends on ARCH_EXYNOS && MMU || (COMPILE_TEST && (ARM || ARM64 || IA64 || SPARC))
340 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
342 select ARM_DMA_USE_IOMMU
344 Support for the IOMMU (System MMU) of Samsung Exynos application
345 processor family. This enables H/W multimedia accelerators to see
346 non-linear physical memory chunks as linear memory in their
349 If unsure, say N here.
351 config EXYNOS_IOMMU_DEBUG
352 bool "Debugging log for Exynos IOMMU"
353 depends on EXYNOS_IOMMU
355 Select this to see the detailed log message that shows what
356 happens in the IOMMU driver.
358 Say N unless you need kernel log message for IOMMU debugging.
361 bool "Renesas VMSA-compatible IPMMU"
362 depends on ARM || IOMMU_DMA
363 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
365 select IOMMU_IO_PGTABLE_LPAE
366 select ARM_DMA_USE_IOMMU
368 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
369 APE6, R-Car Gen2, and R-Car Gen3 SoCs.
373 config SPAPR_TCE_IOMMU
374 bool "sPAPR TCE IOMMU Support"
375 depends on PPC_POWERNV || PPC_PSERIES
378 Enables bits of IOMMU API required by VFIO. The iommu_ops
379 is not implemented as it is not necessary for VFIO.
383 tristate "ARM Ltd. System MMU (SMMU) Support"
384 depends on (ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)) && MMU
386 select IOMMU_IO_PGTABLE_LPAE
387 select ARM_DMA_USE_IOMMU if ARM
389 Support for implementations of the ARM System MMU architecture
392 Say Y here if your SoC includes an IOMMU device implementing
393 the ARM SMMU architecture.
395 config ARM_SMMU_LEGACY_DT_BINDINGS
396 bool "Support the legacy \"mmu-masters\" devicetree bindings"
397 depends on ARM_SMMU=y && OF
399 Support for the badly designed and deprecated "mmu-masters"
400 devicetree bindings. This allows some DMA masters to attach
401 to the SMMU but does not provide any support via the DMA API.
402 If you're lucky, you might be able to get VFIO up and running.
404 If you say Y here then you'll make me very sad. Instead, say N
405 and move your firmware to the utopian future that was 2016.
407 config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
408 bool "Default to disabling bypass on ARM SMMU v1 and v2"
412 Say Y here to (by default) disable bypass streams such that
413 incoming transactions from devices that are not attached to
414 an iommu domain will report an abort back to the device and
415 will not be allowed to pass through the SMMU.
417 Any old kernels that existed before this KConfig was
418 introduced would default to _allowing_ bypass (AKA the
419 equivalent of NO for this config). However the default for
420 this option is YES because the old behavior is insecure.
422 There are few reasons to allow unmatched stream bypass, and
423 even fewer good ones. If saying YES here breaks your board
424 you should work on fixing your board. This KConfig option
425 is expected to be removed in the future and we'll simply
426 hardcode the bypass disable in the code.
428 NOTE: the kernel command line parameter
429 'arm-smmu.disable_bypass' will continue to override this
433 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
436 select IOMMU_IO_PGTABLE_LPAE
437 select GENERIC_MSI_IRQ_DOMAIN
439 Support for implementations of the ARM System MMU architecture
440 version 3 providing translation support to a PCIe root complex.
442 Say Y here if your system includes an IOMMU device implementing
443 the ARM SMMUv3 architecture.
446 def_bool y if S390 && PCI
447 depends on S390 && PCI
450 Support for the IOMMU API for s390 PCI devices.
452 config S390_CCW_IOMMU
453 bool "S390 CCW IOMMU Support"
454 depends on S390 && CCW || COMPILE_TEST
457 Enables bits of IOMMU API required by VFIO. The iommu_ops
458 is not implemented as it is not necessary for VFIO.
461 bool "S390 AP IOMMU Support"
462 depends on S390 && ZCRYPT || COMPILE_TEST
465 Enables bits of IOMMU API required by VFIO. The iommu_ops
466 is not implemented as it is not necessary for VFIO.
469 bool "MTK IOMMU Support"
471 depends on ARCH_MEDIATEK || COMPILE_TEST
472 select ARM_DMA_USE_IOMMU
475 select IOMMU_IO_PGTABLE_ARMV7S
479 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
480 Memory Management Unit. This option enables remapping of DMA memory
481 accesses for the multimedia subsystem.
483 If unsure, say N here.
486 bool "MTK IOMMU Version 1 (M4U gen1) Support"
488 depends on ARCH_MEDIATEK || COMPILE_TEST
489 select ARM_DMA_USE_IOMMU
494 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
495 Multimedia Memory Managememt Unit. This option enables remapping of
496 DMA memory accesses for the multimedia subsystem.
498 if unsure, say N here.
501 # Note: iommu drivers cannot (yet?) be built as modules
502 bool "Qualcomm IOMMU Support"
503 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
505 select IOMMU_IO_PGTABLE_LPAE
506 select ARM_DMA_USE_IOMMU
508 Support for IOMMU on certain Qualcomm SoCs.
511 bool "Hyper-V x2APIC IRQ Handling"
512 depends on HYPERV && X86
516 Stub IOMMU driver to handle IRQs as to allow Hyper-V Linux
517 guests to run with x2APIC mode enabled.
520 tristate "Virtio IOMMU driver"
526 Para-virtualised IOMMU driver with virtio.
528 Say Y here if you intend to run this kernel as a guest.
530 endif # IOMMU_SUPPORT