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
192 DMA remapping (DMAR) devices support enables independent address
193 translations for Direct Memory Access (DMA) from devices.
194 These DMA remapping devices are reported via ACPI tables
195 and include PCI device scope covered by these DMA
198 config INTEL_IOMMU_DEBUGFS
199 bool "Export Intel IOMMU internals in Debugfs"
200 depends on INTEL_IOMMU && IOMMU_DEBUGFS
204 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!!
206 Expose Intel IOMMU internals in Debugfs.
208 This option is -NOT- intended for production environments, and should
209 only be enabled for debugging Intel IOMMU.
211 config INTEL_IOMMU_SVM
212 bool "Support for Shared Virtual Memory with Intel IOMMU"
213 depends on INTEL_IOMMU && X86
217 Shared Virtual Memory (SVM) provides a facility for devices
218 to access DMA resources through process address space by
219 means of a Process Address Space ID (PASID).
221 config INTEL_IOMMU_DEFAULT_ON
223 prompt "Enable Intel DMA Remapping Devices by default"
224 depends on INTEL_IOMMU
226 Selecting this option will enable a DMAR device at boot time if
227 one is found. If this option is not selected, DMAR support can
228 be enabled by passing intel_iommu=on to the kernel.
230 config INTEL_IOMMU_BROKEN_GFX_WA
231 bool "Workaround broken graphics drivers (going away soon)"
232 depends on INTEL_IOMMU && BROKEN && X86
234 Current Graphics drivers tend to use physical address
235 for DMA and avoid using DMA APIs. Setting this config
236 option permits the IOMMU driver to set a unity map for
237 all the OS-visible memory. Hence the driver can continue
238 to use physical addresses for DMA, at least until this
239 option is removed in the 2.6.32 kernel.
241 config INTEL_IOMMU_FLOPPY_WA
243 depends on INTEL_IOMMU && X86
245 Floppy disk drivers are known to bypass DMA API calls
246 thereby failing to work when IOMMU is enabled. This
247 workaround will setup a 1:1 mapping for the first
248 16MiB to make floppy (an ISA device) work.
251 bool "Support for Interrupt Remapping"
252 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
255 Supports Interrupt remapping for IO-APIC and MSI devices.
256 To use x2apic mode in the CPU's which support x2APIC enhancements or
257 to support platforms with CPU's having > 8 bit APIC ID, say Y.
261 bool "OMAP IOMMU Support"
262 depends on ARM && MMU
263 depends on ARCH_OMAP2PLUS || COMPILE_TEST
266 The OMAP3 media platform drivers depend on iommu support,
267 if you need them say Y here.
269 config OMAP_IOMMU_DEBUG
270 bool "Export OMAP IOMMU internals in DebugFS"
271 depends on OMAP_IOMMU && DEBUG_FS
273 Select this to see extensive information about
274 the internal state of OMAP IOMMU in debugfs.
276 Say N unless you know you need this.
278 config ROCKCHIP_IOMMU
279 bool "Rockchip IOMMU Support"
280 depends on ARM || ARM64
281 depends on ARCH_ROCKCHIP || COMPILE_TEST
283 select ARM_DMA_USE_IOMMU
285 Support for IOMMUs found on Rockchip rk32xx SOCs.
286 These IOMMUs allow virtualization of the address space used by most
287 cores within the multimedia subsystem.
288 Say Y here if you are using a Rockchip SoC that includes an IOMMU
291 config TEGRA_IOMMU_GART
292 bool "Tegra GART IOMMU Support"
293 depends on ARCH_TEGRA_2x_SOC
297 Enables support for remapping discontiguous physical memory
298 shared with the operating system into contiguous I/O virtual
299 space through the GART (Graphics Address Relocation Table)
300 hardware included on Tegra SoCs.
302 config TEGRA_IOMMU_SMMU
303 bool "NVIDIA Tegra SMMU Support"
304 depends on ARCH_TEGRA
309 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
310 SoCs (Tegra30 up to Tegra210).
313 bool "Exynos IOMMU Support"
314 depends on ARCH_EXYNOS && MMU
315 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
317 select ARM_DMA_USE_IOMMU
319 Support for the IOMMU (System MMU) of Samsung Exynos application
320 processor family. This enables H/W multimedia accelerators to see
321 non-linear physical memory chunks as linear memory in their
324 If unsure, say N here.
326 config EXYNOS_IOMMU_DEBUG
327 bool "Debugging log for Exynos IOMMU"
328 depends on EXYNOS_IOMMU
330 Select this to see the detailed log message that shows what
331 happens in the IOMMU driver.
333 Say N unless you need kernel log message for IOMMU debugging.
336 bool "Renesas VMSA-compatible IPMMU"
337 depends on ARM || IOMMU_DMA
338 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
340 select IOMMU_IO_PGTABLE_LPAE
341 select ARM_DMA_USE_IOMMU
343 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
344 APE6, R-Car Gen2, and R-Car Gen3 SoCs.
348 config SPAPR_TCE_IOMMU
349 bool "sPAPR TCE IOMMU Support"
350 depends on PPC_POWERNV || PPC_PSERIES
353 Enables bits of IOMMU API required by VFIO. The iommu_ops
354 is not implemented as it is not necessary for VFIO.
358 bool "ARM Ltd. System MMU (SMMU) Support"
359 depends on (ARM64 || ARM) && MMU
361 select IOMMU_IO_PGTABLE_LPAE
362 select ARM_DMA_USE_IOMMU if ARM
364 Support for implementations of the ARM System MMU architecture
367 Say Y here if your SoC includes an IOMMU device implementing
368 the ARM SMMU architecture.
370 config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
371 bool "Default to disabling bypass on ARM SMMU v1 and v2"
375 Say Y here to (by default) disable bypass streams such that
376 incoming transactions from devices that are not attached to
377 an iommu domain will report an abort back to the device and
378 will not be allowed to pass through the SMMU.
380 Any old kernels that existed before this KConfig was
381 introduced would default to _allowing_ bypass (AKA the
382 equivalent of NO for this config). However the default for
383 this option is YES because the old behavior is insecure.
385 There are few reasons to allow unmatched stream bypass, and
386 even fewer good ones. If saying YES here breaks your board
387 you should work on fixing your board. This KConfig option
388 is expected to be removed in the future and we'll simply
389 hardcode the bypass disable in the code.
391 NOTE: the kernel command line parameter
392 'arm-smmu.disable_bypass' will continue to override this
396 bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
399 select IOMMU_IO_PGTABLE_LPAE
400 select GENERIC_MSI_IRQ_DOMAIN
402 Support for implementations of the ARM System MMU architecture
403 version 3 providing translation support to a PCIe root complex.
405 Say Y here if your system includes an IOMMU device implementing
406 the ARM SMMUv3 architecture.
409 def_bool y if S390 && PCI
410 depends on S390 && PCI
413 Support for the IOMMU API for s390 PCI devices.
415 config S390_CCW_IOMMU
416 bool "S390 CCW IOMMU Support"
417 depends on S390 && CCW
420 Enables bits of IOMMU API required by VFIO. The iommu_ops
421 is not implemented as it is not necessary for VFIO.
424 bool "S390 AP IOMMU Support"
425 depends on S390 && ZCRYPT
428 Enables bits of IOMMU API required by VFIO. The iommu_ops
429 is not implemented as it is not necessary for VFIO.
432 bool "MTK IOMMU Support"
433 depends on ARM || ARM64
434 depends on ARCH_MEDIATEK || COMPILE_TEST
435 select ARM_DMA_USE_IOMMU
438 select IOMMU_IO_PGTABLE_ARMV7S
442 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
443 Memory Management Unit. This option enables remapping of DMA memory
444 accesses for the multimedia subsystem.
446 If unsure, say N here.
449 bool "MTK IOMMU Version 1 (M4U gen1) Support"
451 depends on ARCH_MEDIATEK || COMPILE_TEST
452 select ARM_DMA_USE_IOMMU
457 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
458 Multimedia Memory Managememt Unit. This option enables remapping of
459 DMA memory accesses for the multimedia subsystem.
461 if unsure, say N here.
464 # Note: iommu drivers cannot (yet?) be built as modules
465 bool "Qualcomm IOMMU Support"
466 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
468 select IOMMU_IO_PGTABLE_LPAE
469 select ARM_DMA_USE_IOMMU
471 Support for IOMMU on certain Qualcomm SoCs.
474 bool "Hyper-V x2APIC IRQ Handling"
475 depends on HYPERV && X86
479 Stub IOMMU driver to handle IRQs as to allow Hyper-V Linux
480 guests to run with x2APIC mode enabled.
483 bool "Virtio IOMMU driver"
489 Para-virtualised IOMMU driver with virtio.
491 Say Y here if you intend to run this kernel as a guest.
493 endif # IOMMU_SUPPORT