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)
183 select NEED_DMA_MAP_STATE
187 DMA remapping (DMAR) devices support enables independent address
188 translations for Direct Memory Access (DMA) from devices.
189 These DMA remapping devices are reported via ACPI tables
190 and include PCI device scope covered by these DMA
193 config INTEL_IOMMU_DEBUGFS
194 bool "Export Intel IOMMU internals in Debugfs"
195 depends on INTEL_IOMMU && IOMMU_DEBUGFS
199 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
201 Expose Intel IOMMU internals in Debugfs.
203 This option is -NOT- intended for production environments, and should
204 only be enabled for debugging Intel IOMMU.
206 config INTEL_IOMMU_SVM
207 bool "Support for Shared Virtual Memory with Intel IOMMU"
208 depends on INTEL_IOMMU && X86_64
212 Shared Virtual Memory (SVM) provides a facility for devices
213 to access DMA resources through process address space by
214 means of a Process Address Space ID (PASID).
216 config INTEL_IOMMU_DEFAULT_ON
218 prompt "Enable Intel DMA Remapping Devices by default"
219 depends on INTEL_IOMMU
221 Selecting this option will enable a DMAR device at boot time if
222 one is found. If this option is not selected, DMAR support can
223 be enabled by passing intel_iommu=on to the kernel.
225 config INTEL_IOMMU_BROKEN_GFX_WA
226 bool "Workaround broken graphics drivers (going away soon)"
227 depends on INTEL_IOMMU && BROKEN && X86
229 Current Graphics drivers tend to use physical address
230 for DMA and avoid using DMA APIs. Setting this config
231 option permits the IOMMU driver to set a unity map for
232 all the OS-visible memory. Hence the driver can continue
233 to use physical addresses for DMA, at least until this
234 option is removed in the 2.6.32 kernel.
236 config INTEL_IOMMU_FLOPPY_WA
238 depends on INTEL_IOMMU && X86
240 Floppy disk drivers are known to bypass DMA API calls
241 thereby failing to work when IOMMU is enabled. This
242 workaround will setup a 1:1 mapping for the first
243 16MiB to make floppy (an ISA device) work.
246 bool "Support for Interrupt Remapping"
247 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
250 Supports Interrupt remapping for IO-APIC and MSI devices.
251 To use x2apic mode in the CPU's which support x2APIC enhancements or
252 to support platforms with CPU's having > 8 bit APIC ID, say Y.
256 bool "OMAP IOMMU Support"
257 depends on ARM && MMU
258 depends on ARCH_OMAP2PLUS || COMPILE_TEST
261 The OMAP3 media platform drivers depend on iommu support,
262 if you need them say Y here.
264 config OMAP_IOMMU_DEBUG
265 bool "Export OMAP IOMMU internals in DebugFS"
266 depends on OMAP_IOMMU && DEBUG_FS
268 Select this to see extensive information about
269 the internal state of OMAP IOMMU in debugfs.
271 Say N unless you know you need this.
273 config ROCKCHIP_IOMMU
274 bool "Rockchip IOMMU Support"
275 depends on ARM || ARM64
276 depends on ARCH_ROCKCHIP || COMPILE_TEST
278 select ARM_DMA_USE_IOMMU
280 Support for IOMMUs found on Rockchip rk32xx SOCs.
281 These IOMMUs allow virtualization of the address space used by most
282 cores within the multimedia subsystem.
283 Say Y here if you are using a Rockchip SoC that includes an IOMMU
286 config TEGRA_IOMMU_GART
287 bool "Tegra GART IOMMU Support"
288 depends on ARCH_TEGRA_2x_SOC
292 Enables support for remapping discontiguous physical memory
293 shared with the operating system into contiguous I/O virtual
294 space through the GART (Graphics Address Relocation Table)
295 hardware included on Tegra SoCs.
297 config TEGRA_IOMMU_SMMU
298 bool "NVIDIA Tegra SMMU Support"
299 depends on ARCH_TEGRA
304 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
305 SoCs (Tegra30 up to Tegra210).
308 bool "Exynos IOMMU Support"
309 depends on ARCH_EXYNOS && MMU
310 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
312 select ARM_DMA_USE_IOMMU
314 Support for the IOMMU (System MMU) of Samsung Exynos application
315 processor family. This enables H/W multimedia accelerators to see
316 non-linear physical memory chunks as linear memory in their
319 If unsure, say N here.
321 config EXYNOS_IOMMU_DEBUG
322 bool "Debugging log for Exynos IOMMU"
323 depends on EXYNOS_IOMMU
325 Select this to see the detailed log message that shows what
326 happens in the IOMMU driver.
328 Say N unless you need kernel log message for IOMMU debugging.
331 bool "Renesas VMSA-compatible IPMMU"
332 depends on ARM || IOMMU_DMA
333 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
335 select IOMMU_IO_PGTABLE_LPAE
336 select ARM_DMA_USE_IOMMU
338 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
339 APE6, R-Car Gen2, and R-Car Gen3 SoCs.
343 config SPAPR_TCE_IOMMU
344 bool "sPAPR TCE IOMMU Support"
345 depends on PPC_POWERNV || PPC_PSERIES
348 Enables bits of IOMMU API required by VFIO. The iommu_ops
349 is not implemented as it is not necessary for VFIO.
353 bool "ARM Ltd. System MMU (SMMU) Support"
354 depends on (ARM64 || ARM) && MMU
356 select IOMMU_IO_PGTABLE_LPAE
357 select ARM_DMA_USE_IOMMU if ARM
359 Support for implementations of the ARM System MMU architecture
362 Say Y here if your SoC includes an IOMMU device implementing
363 the ARM SMMU architecture.
365 config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
366 bool "Default to disabling bypass on ARM SMMU v1 and v2"
370 Say Y here to (by default) disable bypass streams such that
371 incoming transactions from devices that are not attached to
372 an iommu domain will report an abort back to the device and
373 will not be allowed to pass through the SMMU.
375 Any old kernels that existed before this KConfig was
376 introduced would default to _allowing_ bypass (AKA the
377 equivalent of NO for this config). However the default for
378 this option is YES because the old behavior is insecure.
380 There are few reasons to allow unmatched stream bypass, and
381 even fewer good ones. If saying YES here breaks your board
382 you should work on fixing your board. This KConfig option
383 is expected to be removed in the future and we'll simply
384 hardcode the bypass disable in the code.
386 NOTE: the kernel command line parameter
387 'arm-smmu.disable_bypass' will continue to override this
391 bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
394 select IOMMU_IO_PGTABLE_LPAE
395 select GENERIC_MSI_IRQ_DOMAIN
397 Support for implementations of the ARM System MMU architecture
398 version 3 providing translation support to a PCIe root complex.
400 Say Y here if your system includes an IOMMU device implementing
401 the ARM SMMUv3 architecture.
404 def_bool y if S390 && PCI
405 depends on S390 && PCI
408 Support for the IOMMU API for s390 PCI devices.
410 config S390_CCW_IOMMU
411 bool "S390 CCW IOMMU Support"
412 depends on S390 && CCW
415 Enables bits of IOMMU API required by VFIO. The iommu_ops
416 is not implemented as it is not necessary for VFIO.
419 bool "S390 AP IOMMU Support"
420 depends on S390 && ZCRYPT
423 Enables bits of IOMMU API required by VFIO. The iommu_ops
424 is not implemented as it is not necessary for VFIO.
427 bool "MTK IOMMU Support"
428 depends on ARM || ARM64
429 depends on ARCH_MEDIATEK || COMPILE_TEST
430 select ARM_DMA_USE_IOMMU
433 select IOMMU_IO_PGTABLE_ARMV7S
437 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
438 Memory Management Unit. This option enables remapping of DMA memory
439 accesses for the multimedia subsystem.
441 If unsure, say N here.
444 bool "MTK IOMMU Version 1 (M4U gen1) Support"
446 depends on ARCH_MEDIATEK || COMPILE_TEST
447 select ARM_DMA_USE_IOMMU
452 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
453 Multimedia Memory Managememt Unit. This option enables remapping of
454 DMA memory accesses for the multimedia subsystem.
456 if unsure, say N here.
459 # Note: iommu drivers cannot (yet?) be built as modules
460 bool "Qualcomm IOMMU Support"
461 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
463 select IOMMU_IO_PGTABLE_LPAE
464 select ARM_DMA_USE_IOMMU
466 Support for IOMMU on certain Qualcomm SoCs.
469 bool "Hyper-V x2APIC IRQ Handling"
474 Stub IOMMU driver to handle IRQs as to allow Hyper-V Linux
475 guests to run with x2APIC mode enabled.
478 bool "Virtio IOMMU driver"
484 Para-virtualised IOMMU driver with virtio.
486 Say Y here if you intend to run this kernel as a guest.
488 endif # IOMMU_SUPPORT