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.
10 menuconfig IOMMU_SUPPORT
11 bool "IOMMU Hardware Support"
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
22 menu "Generic IOMMU Pagetable Support"
24 # Selected by the actual pagetable implementations
25 config IOMMU_IO_PGTABLE
28 config IOMMU_IO_PGTABLE_LPAE
29 bool "ARMv7/v8 Long Descriptor Format"
30 select IOMMU_IO_PGTABLE
31 depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
33 Enable support for the ARM long descriptor pagetable format.
34 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
35 sizes at both stage-1 and stage-2, as well as address spaces
36 up to 48-bits in size.
38 config IOMMU_IO_PGTABLE_LPAE_SELFTEST
40 depends on IOMMU_IO_PGTABLE_LPAE
42 Enable self-tests for LPAE page table allocator. This performs
43 a series of page-table consistency checks during boot.
45 If unsure, say N here.
47 config IOMMU_IO_PGTABLE_ARMV7S
48 bool "ARMv7/v8 Short Descriptor Format"
49 select IOMMU_IO_PGTABLE
50 depends on ARM || ARM64 || COMPILE_TEST
52 Enable support for the ARM Short-descriptor pagetable format.
53 This supports 32-bit virtual and physical addresses mapped using
54 2-level tables with 4KB pages/1MB sections, and contiguous entries
55 for 64KB pages/16MB supersections if indicated by the IOMMU driver.
57 config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
58 bool "ARMv7s selftests"
59 depends on IOMMU_IO_PGTABLE_ARMV7S
61 Enable self-tests for ARMv7s page table allocator. This performs
62 a series of page-table consistency checks during boot.
64 If unsure, say N here.
69 bool "Export IOMMU internals in DebugFS"
72 Allows exposure of IOMMU device internals. This option enables
73 the use of debugfs by IOMMU drivers as required. Devices can,
74 at initialization time, cause the IOMMU code to create a top-level
75 debug/iommu directory, and then populate a subdirectory with
78 config IOMMU_DEFAULT_PASSTHROUGH
79 bool "IOMMU passthrough by default"
82 Enable passthrough by default, removing the need to pass in
83 iommu.passthrough=on or iommu=pt through command line. If this
84 is enabled, you can still disable with iommu.passthrough=off
85 or iommu=nopt depending on the architecture.
87 If unsure, say N here.
91 depends on OF && IOMMU_API
93 # IOMMU-agnostic DMA-mapping layer
99 select NEED_SG_DMA_LENGTH
102 bool "Freescale IOMMU support"
104 depends on PHYS_64BIT
105 depends on PPC_E500MC || (COMPILE_TEST && PPC)
107 select GENERIC_ALLOCATOR
109 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
110 PAMU can authorize memory access, remap the memory address, and remap I/O
115 bool "MSM IOMMU Support"
117 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
119 select IOMMU_IO_PGTABLE_ARMV7S
121 Support for the IOMMUs found on certain Qualcomm SOCs.
122 These IOMMUs allow virtualization of the address space used by most
123 cores within the multimedia subsystem.
125 If unsure, say N here.
127 config IOMMU_PGTABLES_L2
129 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
133 bool "AMD IOMMU support"
141 depends on X86_64 && PCI && ACPI
143 With this option you can enable support for AMD IOMMU hardware in
144 your system. An IOMMU is a hardware component which provides
145 remapping of DMA memory accesses from devices. With an AMD IOMMU you
146 can isolate the DMA memory of different devices and protect the
147 system from misbehaving device drivers or hardware.
149 You can find out if your system has an AMD IOMMU if you look into
150 your BIOS for an option to enable it or if you have an IVRS ACPI
154 tristate "AMD IOMMU Version 2 driver"
158 This option enables support for the AMD IOMMUv2 features of the IOMMU
159 hardware. Select this option if you want to use devices that support
160 the PCI PRI and PASID interface.
162 config AMD_IOMMU_DEBUGFS
163 bool "Enable AMD IOMMU internals in DebugFS"
164 depends on AMD_IOMMU && IOMMU_DEBUGFS
166 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!!
168 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
169 Exposes AMD IOMMU device internals in DebugFS.
171 This option is -NOT- intended for production environments, and should
172 not generally be enabled.
174 # Intel IOMMU support
179 bool "Support for Intel IOMMU using DMA Remapping Devices"
180 depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
183 select NEED_DMA_MAP_STATE
186 DMA remapping (DMAR) devices support enables independent address
187 translations for Direct Memory Access (DMA) from devices.
188 These DMA remapping devices are reported via ACPI tables
189 and include PCI device scope covered by these DMA
192 config INTEL_IOMMU_DEBUGFS
193 bool "Export Intel IOMMU internals in Debugfs"
194 depends on INTEL_IOMMU && IOMMU_DEBUGFS
198 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
200 Expose Intel IOMMU internals in Debugfs.
202 This option is -NOT- intended for production environments, and should
203 only be enabled for debugging Intel IOMMU.
205 config INTEL_IOMMU_SVM
206 bool "Support for Shared Virtual Memory with Intel IOMMU"
207 depends on INTEL_IOMMU && X86
211 Shared Virtual Memory (SVM) provides a facility for devices
212 to access DMA resources through process address space by
213 means of a Process Address Space ID (PASID).
215 config INTEL_IOMMU_DEFAULT_ON
217 prompt "Enable Intel DMA Remapping Devices by default"
218 depends on INTEL_IOMMU
220 Selecting this option will enable a DMAR device at boot time if
221 one is found. If this option is not selected, DMAR support can
222 be enabled by passing intel_iommu=on to the kernel.
224 config INTEL_IOMMU_BROKEN_GFX_WA
225 bool "Workaround broken graphics drivers (going away soon)"
226 depends on INTEL_IOMMU && BROKEN && X86
228 Current Graphics drivers tend to use physical address
229 for DMA and avoid using DMA APIs. Setting this config
230 option permits the IOMMU driver to set a unity map for
231 all the OS-visible memory. Hence the driver can continue
232 to use physical addresses for DMA, at least until this
233 option is removed in the 2.6.32 kernel.
235 config INTEL_IOMMU_FLOPPY_WA
237 depends on INTEL_IOMMU && X86
239 Floppy disk drivers are known to bypass DMA API calls
240 thereby failing to work when IOMMU is enabled. This
241 workaround will setup a 1:1 mapping for the first
242 16MiB to make floppy (an ISA device) work.
245 bool "Support for Interrupt Remapping"
246 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
249 Supports Interrupt remapping for IO-APIC and MSI devices.
250 To use x2apic mode in the CPU's which support x2APIC enhancements or
251 to support platforms with CPU's having > 8 bit APIC ID, say Y.
255 bool "OMAP IOMMU Support"
256 depends on ARM && MMU
257 depends on ARCH_OMAP2PLUS || COMPILE_TEST
260 The OMAP3 media platform drivers depend on iommu support,
261 if you need them say Y here.
263 config OMAP_IOMMU_DEBUG
264 bool "Export OMAP IOMMU internals in DebugFS"
265 depends on OMAP_IOMMU && DEBUG_FS
267 Select this to see extensive information about
268 the internal state of OMAP IOMMU in debugfs.
270 Say N unless you know you need this.
272 config ROCKCHIP_IOMMU
273 bool "Rockchip IOMMU Support"
274 depends on ARM || ARM64
275 depends on ARCH_ROCKCHIP || COMPILE_TEST
277 select ARM_DMA_USE_IOMMU
279 Support for IOMMUs found on Rockchip rk32xx SOCs.
280 These IOMMUs allow virtualization of the address space used by most
281 cores within the multimedia subsystem.
282 Say Y here if you are using a Rockchip SoC that includes an IOMMU
285 config TEGRA_IOMMU_GART
286 bool "Tegra GART IOMMU Support"
287 depends on ARCH_TEGRA_2x_SOC
291 Enables support for remapping discontiguous physical memory
292 shared with the operating system into contiguous I/O virtual
293 space through the GART (Graphics Address Relocation Table)
294 hardware included on Tegra SoCs.
296 config TEGRA_IOMMU_SMMU
297 bool "NVIDIA Tegra SMMU Support"
298 depends on ARCH_TEGRA
303 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
304 SoCs (Tegra30 up to Tegra210).
307 bool "Exynos IOMMU Support"
308 depends on ARCH_EXYNOS && MMU
309 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
311 select ARM_DMA_USE_IOMMU
313 Support for the IOMMU (System MMU) of Samsung Exynos application
314 processor family. This enables H/W multimedia accelerators to see
315 non-linear physical memory chunks as linear memory in their
318 If unsure, say N here.
320 config EXYNOS_IOMMU_DEBUG
321 bool "Debugging log for Exynos IOMMU"
322 depends on EXYNOS_IOMMU
324 Select this to see the detailed log message that shows what
325 happens in the IOMMU driver.
327 Say N unless you need kernel log message for IOMMU debugging.
330 bool "Renesas VMSA-compatible IPMMU"
331 depends on ARM || IOMMU_DMA
332 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
334 select IOMMU_IO_PGTABLE_LPAE
335 select ARM_DMA_USE_IOMMU
337 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
338 APE6, R-Car Gen2, and R-Car Gen3 SoCs.
342 config SPAPR_TCE_IOMMU
343 bool "sPAPR TCE IOMMU Support"
344 depends on PPC_POWERNV || PPC_PSERIES
347 Enables bits of IOMMU API required by VFIO. The iommu_ops
348 is not implemented as it is not necessary for VFIO.
352 bool "ARM Ltd. System MMU (SMMU) Support"
353 depends on (ARM64 || ARM) && MMU
355 select IOMMU_IO_PGTABLE_LPAE
356 select ARM_DMA_USE_IOMMU if ARM
358 Support for implementations of the ARM System MMU architecture
361 Say Y here if your SoC includes an IOMMU device implementing
362 the ARM SMMU architecture.
364 config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
365 bool "Default to disabling bypass on ARM SMMU v1 and v2"
369 Say Y here to (by default) disable bypass streams such that
370 incoming transactions from devices that are not attached to
371 an iommu domain will report an abort back to the device and
372 will not be allowed to pass through the SMMU.
374 Any old kernels that existed before this KConfig was
375 introduced would default to _allowing_ bypass (AKA the
376 equivalent of NO for this config). However the default for
377 this option is YES because the old behavior is insecure.
379 There are few reasons to allow unmatched stream bypass, and
380 even fewer good ones. If saying YES here breaks your board
381 you should work on fixing your board. This KConfig option
382 is expected to be removed in the future and we'll simply
383 hardcode the bypass disable in the code.
385 NOTE: the kernel command line parameter
386 'arm-smmu.disable_bypass' will continue to override this
390 bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
393 select IOMMU_IO_PGTABLE_LPAE
394 select GENERIC_MSI_IRQ_DOMAIN
396 Support for implementations of the ARM System MMU architecture
397 version 3 providing translation support to a PCIe root complex.
399 Say Y here if your system includes an IOMMU device implementing
400 the ARM SMMUv3 architecture.
403 def_bool y if S390 && PCI
404 depends on S390 && PCI
407 Support for the IOMMU API for s390 PCI devices.
409 config S390_CCW_IOMMU
410 bool "S390 CCW IOMMU Support"
411 depends on S390 && CCW
414 Enables bits of IOMMU API required by VFIO. The iommu_ops
415 is not implemented as it is not necessary for VFIO.
418 bool "S390 AP IOMMU Support"
419 depends on S390 && ZCRYPT
422 Enables bits of IOMMU API required by VFIO. The iommu_ops
423 is not implemented as it is not necessary for VFIO.
426 bool "MTK IOMMU Support"
427 depends on ARM || ARM64
428 depends on ARCH_MEDIATEK || COMPILE_TEST
429 select ARM_DMA_USE_IOMMU
432 select IOMMU_IO_PGTABLE_ARMV7S
436 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
437 Memory Management Unit. This option enables remapping of DMA memory
438 accesses for the multimedia subsystem.
440 If unsure, say N here.
443 bool "MTK IOMMU Version 1 (M4U gen1) Support"
445 depends on ARCH_MEDIATEK || COMPILE_TEST
446 select ARM_DMA_USE_IOMMU
451 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
452 Multimedia Memory Managememt Unit. This option enables remapping of
453 DMA memory accesses for the multimedia subsystem.
455 if unsure, say N here.
458 # Note: iommu drivers cannot (yet?) be built as modules
459 bool "Qualcomm IOMMU Support"
460 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
462 select IOMMU_IO_PGTABLE_LPAE
463 select ARM_DMA_USE_IOMMU
465 Support for IOMMU on certain Qualcomm SoCs.
468 bool "Hyper-V x2APIC IRQ Handling"
473 Stub IOMMU driver to handle IRQs as to allow Hyper-V Linux
474 guests to run with x2APIC mode enabled.
477 bool "Virtio IOMMU driver"
483 Para-virtualised IOMMU driver with virtio.
485 Say Y here if you intend to run this kernel as a guest.
487 endif # IOMMU_SUPPORT