1 # IOMMU_API always gets selected by whoever wants it.
5 menuconfig IOMMU_SUPPORT
6 bool "IOMMU Hardware Support"
10 Say Y here if you want to compile device drivers for IO Memory
11 Management Units into the kernel. These devices usually allow to
12 remap DMA requests and/or remap interrupts from other devices on the
17 menu "Generic IOMMU Pagetable Support"
19 # Selected by the actual pagetable implementations
20 config IOMMU_IO_PGTABLE
23 config IOMMU_IO_PGTABLE_LPAE
24 bool "ARMv7/v8 Long Descriptor Format"
25 select IOMMU_IO_PGTABLE
26 depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
28 Enable support for the ARM long descriptor pagetable format.
29 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
30 sizes at both stage-1 and stage-2, as well as address spaces
31 up to 48-bits in size.
33 config IOMMU_IO_PGTABLE_LPAE_SELFTEST
35 depends on IOMMU_IO_PGTABLE_LPAE
37 Enable self-tests for LPAE page table allocator. This performs
38 a series of page-table consistency checks during boot.
40 If unsure, say N here.
42 config IOMMU_IO_PGTABLE_ARMV7S
43 bool "ARMv7/v8 Short Descriptor Format"
44 select IOMMU_IO_PGTABLE
45 depends on ARM || ARM64 || COMPILE_TEST
47 Enable support for the ARM Short-descriptor pagetable format.
48 This supports 32-bit virtual and physical addresses mapped using
49 2-level tables with 4KB pages/1MB sections, and contiguous entries
50 for 64KB pages/16MB supersections if indicated by the IOMMU driver.
52 config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
53 bool "ARMv7s selftests"
54 depends on IOMMU_IO_PGTABLE_ARMV7S
56 Enable self-tests for ARMv7s page table allocator. This performs
57 a series of page-table consistency checks during boot.
59 If unsure, say N here.
64 bool "Export IOMMU internals in DebugFS"
67 Allows exposure of IOMMU device internals. This option enables
68 the use of debugfs by IOMMU drivers as required. Devices can,
69 at initialization time, cause the IOMMU code to create a top-level
70 debug/iommu directory, and then populate a subdirectory with
73 config IOMMU_DEFAULT_PASSTHROUGH
74 bool "IOMMU passthrough by default"
77 Enable passthrough by default, removing the need to pass in
78 iommu.passthrough=on or iommu=pt through command line. If this
79 is enabled, you can still disable with iommu.passthrough=off
80 or iommu=nopt depending on the architecture.
82 If unsure, say N here.
89 depends on OF && IOMMU_API
91 # IOMMU-agnostic DMA-mapping layer
96 select NEED_SG_DMA_LENGTH
99 bool "Freescale IOMMU support"
101 depends on PHYS_64BIT
102 depends on PPC_E500MC || (COMPILE_TEST && PPC)
104 select GENERIC_ALLOCATOR
106 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
107 PAMU can authorize memory access, remap the memory address, and remap I/O
112 bool "MSM IOMMU Support"
114 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST
116 select IOMMU_IO_PGTABLE_ARMV7S
118 Support for the IOMMUs found on certain Qualcomm SOCs.
119 These IOMMUs allow virtualization of the address space used by most
120 cores within the multimedia subsystem.
122 If unsure, say N here.
124 config IOMMU_PGTABLES_L2
126 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
130 bool "AMD IOMMU support"
138 depends on X86_64 && PCI && ACPI
140 With this option you can enable support for AMD IOMMU hardware in
141 your system. An IOMMU is a hardware component which provides
142 remapping of DMA memory accesses from devices. With an AMD IOMMU you
143 can isolate the DMA memory of different devices and protect the
144 system from misbehaving device drivers or hardware.
146 You can find out if your system has an AMD IOMMU if you look into
147 your BIOS for an option to enable it or if you have an IVRS ACPI
151 tristate "AMD IOMMU Version 2 driver"
155 This option enables support for the AMD IOMMUv2 features of the IOMMU
156 hardware. Select this option if you want to use devices that support
157 the PCI PRI and PASID interface.
159 config AMD_IOMMU_DEBUGFS
160 bool "Enable AMD IOMMU internals in DebugFS"
161 depends on AMD_IOMMU && IOMMU_DEBUGFS
163 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!!
165 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
166 Exposes AMD IOMMU device internals in DebugFS.
168 This option is -NOT- intended for production environments, and should
169 not generally be enabled.
171 # Intel IOMMU support
176 bool "Support for Intel IOMMU using DMA Remapping Devices"
177 depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
180 select NEED_DMA_MAP_STATE
183 DMA remapping (DMAR) devices support enables independent address
184 translations for Direct Memory Access (DMA) from devices.
185 These DMA remapping devices are reported via ACPI tables
186 and include PCI device scope covered by these DMA
189 config INTEL_IOMMU_SVM
190 bool "Support for Shared Virtual Memory with Intel IOMMU"
191 depends on INTEL_IOMMU && X86
195 Shared Virtual Memory (SVM) provides a facility for devices
196 to access DMA resources through process address space by
197 means of a Process Address Space ID (PASID).
199 config INTEL_IOMMU_DEFAULT_ON
201 prompt "Enable Intel DMA Remapping Devices by default"
202 depends on INTEL_IOMMU
204 Selecting this option will enable a DMAR device at boot time if
205 one is found. If this option is not selected, DMAR support can
206 be enabled by passing intel_iommu=on to the kernel.
208 config INTEL_IOMMU_BROKEN_GFX_WA
209 bool "Workaround broken graphics drivers (going away soon)"
210 depends on INTEL_IOMMU && BROKEN && X86
212 Current Graphics drivers tend to use physical address
213 for DMA and avoid using DMA APIs. Setting this config
214 option permits the IOMMU driver to set a unity map for
215 all the OS-visible memory. Hence the driver can continue
216 to use physical addresses for DMA, at least until this
217 option is removed in the 2.6.32 kernel.
219 config INTEL_IOMMU_FLOPPY_WA
221 depends on INTEL_IOMMU && X86
223 Floppy disk drivers are known to bypass DMA API calls
224 thereby failing to work when IOMMU is enabled. This
225 workaround will setup a 1:1 mapping for the first
226 16MiB to make floppy (an ISA device) work.
229 bool "Support for Interrupt Remapping"
230 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
233 Supports Interrupt remapping for IO-APIC and MSI devices.
234 To use x2apic mode in the CPU's which support x2APIC enhancements or
235 to support platforms with CPU's having > 8 bit APIC ID, say Y.
239 bool "OMAP IOMMU Support"
240 depends on ARM && MMU
241 depends on ARCH_OMAP2PLUS || COMPILE_TEST
244 The OMAP3 media platform drivers depend on iommu support,
245 if you need them say Y here.
247 config OMAP_IOMMU_DEBUG
248 bool "Export OMAP IOMMU internals in DebugFS"
249 depends on OMAP_IOMMU && DEBUG_FS
251 Select this to see extensive information about
252 the internal state of OMAP IOMMU in debugfs.
254 Say N unless you know you need this.
256 config ROCKCHIP_IOMMU
257 bool "Rockchip IOMMU Support"
258 depends on ARM || ARM64
259 depends on ARCH_ROCKCHIP || COMPILE_TEST
261 select ARM_DMA_USE_IOMMU
263 Support for IOMMUs found on Rockchip rk32xx SOCs.
264 These IOMMUs allow virtualization of the address space used by most
265 cores within the multimedia subsystem.
266 Say Y here if you are using a Rockchip SoC that includes an IOMMU
269 config TEGRA_IOMMU_GART
270 bool "Tegra GART IOMMU Support"
271 depends on ARCH_TEGRA_2x_SOC
274 Enables support for remapping discontiguous physical memory
275 shared with the operating system into contiguous I/O virtual
276 space through the GART (Graphics Address Relocation Table)
277 hardware included on Tegra SoCs.
279 config TEGRA_IOMMU_SMMU
280 bool "NVIDIA Tegra SMMU Support"
281 depends on ARCH_TEGRA
286 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
287 SoCs (Tegra30 up to Tegra210).
290 bool "Exynos IOMMU Support"
291 depends on ARCH_EXYNOS && MMU
292 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
294 select ARM_DMA_USE_IOMMU
296 Support for the IOMMU (System MMU) of Samsung Exynos application
297 processor family. This enables H/W multimedia accelerators to see
298 non-linear physical memory chunks as linear memory in their
301 If unsure, say N here.
303 config EXYNOS_IOMMU_DEBUG
304 bool "Debugging log for Exynos IOMMU"
305 depends on EXYNOS_IOMMU
307 Select this to see the detailed log message that shows what
308 happens in the IOMMU driver.
310 Say N unless you need kernel log message for IOMMU debugging.
313 bool "Renesas VMSA-compatible IPMMU"
314 depends on ARM || IOMMU_DMA
315 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
317 select IOMMU_IO_PGTABLE_LPAE
318 select ARM_DMA_USE_IOMMU
320 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
321 APE6, R-Car Gen2, and R-Car Gen3 SoCs.
325 config SPAPR_TCE_IOMMU
326 bool "sPAPR TCE IOMMU Support"
327 depends on PPC_POWERNV || PPC_PSERIES
330 Enables bits of IOMMU API required by VFIO. The iommu_ops
331 is not implemented as it is not necessary for VFIO.
335 bool "ARM Ltd. System MMU (SMMU) Support"
336 depends on (ARM64 || ARM) && MMU
338 select IOMMU_IO_PGTABLE_LPAE
339 select ARM_DMA_USE_IOMMU if ARM
341 Support for implementations of the ARM System MMU architecture
344 Say Y here if your SoC includes an IOMMU device implementing
345 the ARM SMMU architecture.
348 bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
351 select IOMMU_IO_PGTABLE_LPAE
352 select GENERIC_MSI_IRQ_DOMAIN
354 Support for implementations of the ARM System MMU architecture
355 version 3 providing translation support to a PCIe root complex.
357 Say Y here if your system includes an IOMMU device implementing
358 the ARM SMMUv3 architecture.
361 def_bool y if S390 && PCI
362 depends on S390 && PCI
365 Support for the IOMMU API for s390 PCI devices.
367 config S390_CCW_IOMMU
368 bool "S390 CCW IOMMU Support"
369 depends on S390 && CCW
372 Enables bits of IOMMU API required by VFIO. The iommu_ops
373 is not implemented as it is not necessary for VFIO.
376 bool "MTK IOMMU Support"
377 depends on ARM || ARM64
378 depends on ARCH_MEDIATEK || COMPILE_TEST
379 select ARM_DMA_USE_IOMMU
382 select IOMMU_IO_PGTABLE_ARMV7S
386 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
387 Memory Management Unit. This option enables remapping of DMA memory
388 accesses for the multimedia subsystem.
390 If unsure, say N here.
393 bool "MTK IOMMU Version 1 (M4U gen1) Support"
395 depends on ARCH_MEDIATEK || COMPILE_TEST
396 select ARM_DMA_USE_IOMMU
401 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
402 Multimedia Memory Managememt Unit. This option enables remapping of
403 DMA memory accesses for the multimedia subsystem.
405 if unsure, say N here.
408 # Note: iommu drivers cannot (yet?) be built as modules
409 bool "Qualcomm IOMMU Support"
410 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
412 select IOMMU_IO_PGTABLE_LPAE
413 select ARM_DMA_USE_IOMMU
415 Support for IOMMU on certain Qualcomm SoCs.
417 endif # IOMMU_SUPPORT