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
218 Shared Virtual Memory (SVM) provides a facility for devices
219 to access DMA resources through process address space by
220 means of a Process Address Space ID (PASID).
222 config INTEL_IOMMU_DEFAULT_ON
224 prompt "Enable Intel DMA Remapping Devices by default"
225 depends on INTEL_IOMMU
227 Selecting this option will enable a DMAR device at boot time if
228 one is found. If this option is not selected, DMAR support can
229 be enabled by passing intel_iommu=on to the kernel.
231 config INTEL_IOMMU_BROKEN_GFX_WA
232 bool "Workaround broken graphics drivers (going away soon)"
233 depends on INTEL_IOMMU && BROKEN && X86
235 Current Graphics drivers tend to use physical address
236 for DMA and avoid using DMA APIs. Setting this config
237 option permits the IOMMU driver to set a unity map for
238 all the OS-visible memory. Hence the driver can continue
239 to use physical addresses for DMA, at least until this
240 option is removed in the 2.6.32 kernel.
242 config INTEL_IOMMU_FLOPPY_WA
244 depends on INTEL_IOMMU && X86
246 Floppy disk drivers are known to bypass DMA API calls
247 thereby failing to work when IOMMU is enabled. This
248 workaround will setup a 1:1 mapping for the first
249 16MiB to make floppy (an ISA device) work.
252 bool "Support for Interrupt Remapping"
253 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
256 Supports Interrupt remapping for IO-APIC and MSI devices.
257 To use x2apic mode in the CPU's which support x2APIC enhancements or
258 to support platforms with CPU's having > 8 bit APIC ID, say Y.
262 bool "OMAP IOMMU Support"
263 depends on ARM && MMU
264 depends on ARCH_OMAP2PLUS || COMPILE_TEST
267 The OMAP3 media platform drivers depend on iommu support,
268 if you need them say Y here.
270 config OMAP_IOMMU_DEBUG
271 bool "Export OMAP IOMMU internals in DebugFS"
272 depends on OMAP_IOMMU && DEBUG_FS
274 Select this to see extensive information about
275 the internal state of OMAP IOMMU in debugfs.
277 Say N unless you know you need this.
279 config ROCKCHIP_IOMMU
280 bool "Rockchip IOMMU Support"
281 depends on ARM || ARM64
282 depends on ARCH_ROCKCHIP || COMPILE_TEST
284 select ARM_DMA_USE_IOMMU
286 Support for IOMMUs found on Rockchip rk32xx SOCs.
287 These IOMMUs allow virtualization of the address space used by most
288 cores within the multimedia subsystem.
289 Say Y here if you are using a Rockchip SoC that includes an IOMMU
292 config TEGRA_IOMMU_GART
293 bool "Tegra GART IOMMU Support"
294 depends on ARCH_TEGRA_2x_SOC
298 Enables support for remapping discontiguous physical memory
299 shared with the operating system into contiguous I/O virtual
300 space through the GART (Graphics Address Relocation Table)
301 hardware included on Tegra SoCs.
303 config TEGRA_IOMMU_SMMU
304 bool "NVIDIA Tegra SMMU Support"
305 depends on ARCH_TEGRA
310 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
311 SoCs (Tegra30 up to Tegra210).
314 bool "Exynos IOMMU Support"
315 depends on ARCH_EXYNOS && MMU
316 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
318 select ARM_DMA_USE_IOMMU
320 Support for the IOMMU (System MMU) of Samsung Exynos application
321 processor family. This enables H/W multimedia accelerators to see
322 non-linear physical memory chunks as linear memory in their
325 If unsure, say N here.
327 config EXYNOS_IOMMU_DEBUG
328 bool "Debugging log for Exynos IOMMU"
329 depends on EXYNOS_IOMMU
331 Select this to see the detailed log message that shows what
332 happens in the IOMMU driver.
334 Say N unless you need kernel log message for IOMMU debugging.
337 bool "Renesas VMSA-compatible IPMMU"
338 depends on ARM || IOMMU_DMA
339 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
341 select IOMMU_IO_PGTABLE_LPAE
342 select ARM_DMA_USE_IOMMU
344 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
345 APE6, R-Car Gen2, and R-Car Gen3 SoCs.
349 config SPAPR_TCE_IOMMU
350 bool "sPAPR TCE IOMMU Support"
351 depends on PPC_POWERNV || PPC_PSERIES
354 Enables bits of IOMMU API required by VFIO. The iommu_ops
355 is not implemented as it is not necessary for VFIO.
359 bool "ARM Ltd. System MMU (SMMU) Support"
360 depends on (ARM64 || ARM) && MMU
362 select IOMMU_IO_PGTABLE_LPAE
363 select ARM_DMA_USE_IOMMU if ARM
365 Support for implementations of the ARM System MMU architecture
368 Say Y here if your SoC includes an IOMMU device implementing
369 the ARM SMMU architecture.
371 config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
372 bool "Default to disabling bypass on ARM SMMU v1 and v2"
376 Say Y here to (by default) disable bypass streams such that
377 incoming transactions from devices that are not attached to
378 an iommu domain will report an abort back to the device and
379 will not be allowed to pass through the SMMU.
381 Any old kernels that existed before this KConfig was
382 introduced would default to _allowing_ bypass (AKA the
383 equivalent of NO for this config). However the default for
384 this option is YES because the old behavior is insecure.
386 There are few reasons to allow unmatched stream bypass, and
387 even fewer good ones. If saying YES here breaks your board
388 you should work on fixing your board. This KConfig option
389 is expected to be removed in the future and we'll simply
390 hardcode the bypass disable in the code.
392 NOTE: the kernel command line parameter
393 'arm-smmu.disable_bypass' will continue to override this
397 bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
400 select IOMMU_IO_PGTABLE_LPAE
401 select GENERIC_MSI_IRQ_DOMAIN
403 Support for implementations of the ARM System MMU architecture
404 version 3 providing translation support to a PCIe root complex.
406 Say Y here if your system includes an IOMMU device implementing
407 the ARM SMMUv3 architecture.
410 def_bool y if S390 && PCI
411 depends on S390 && PCI
414 Support for the IOMMU API for s390 PCI devices.
416 config S390_CCW_IOMMU
417 bool "S390 CCW IOMMU Support"
418 depends on S390 && CCW
421 Enables bits of IOMMU API required by VFIO. The iommu_ops
422 is not implemented as it is not necessary for VFIO.
425 bool "S390 AP IOMMU Support"
426 depends on S390 && ZCRYPT
429 Enables bits of IOMMU API required by VFIO. The iommu_ops
430 is not implemented as it is not necessary for VFIO.
433 bool "MTK IOMMU Support"
434 depends on ARM || ARM64
435 depends on ARCH_MEDIATEK || COMPILE_TEST
436 select ARM_DMA_USE_IOMMU
439 select IOMMU_IO_PGTABLE_ARMV7S
443 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
444 Memory Management Unit. This option enables remapping of DMA memory
445 accesses for the multimedia subsystem.
447 If unsure, say N here.
450 bool "MTK IOMMU Version 1 (M4U gen1) Support"
452 depends on ARCH_MEDIATEK || COMPILE_TEST
453 select ARM_DMA_USE_IOMMU
458 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
459 Multimedia Memory Managememt Unit. This option enables remapping of
460 DMA memory accesses for the multimedia subsystem.
462 if unsure, say N here.
465 # Note: iommu drivers cannot (yet?) be built as modules
466 bool "Qualcomm IOMMU Support"
467 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
469 select IOMMU_IO_PGTABLE_LPAE
470 select ARM_DMA_USE_IOMMU
472 Support for IOMMU on certain Qualcomm SoCs.
475 bool "Hyper-V x2APIC IRQ Handling"
476 depends on HYPERV && X86
480 Stub IOMMU driver to handle IRQs as to allow Hyper-V Linux
481 guests to run with x2APIC mode enabled.
484 bool "Virtio IOMMU driver"
490 Para-virtualised IOMMU driver with virtio.
492 Say Y here if you intend to run this kernel as a guest.
494 endif # IOMMU_SUPPORT