1# SPDX-License-Identifier: GPL-2.0-only 2# The IOVA library may also be used by non-IOMMU_API users 3config IOMMU_IOVA 4 tristate 5 6# IOMMU_API always gets selected by whoever wants it. 7config IOMMU_API 8 bool 9 10config IOMMUFD_DRIVER 11 bool 12 default n 13 14menuconfig IOMMU_SUPPORT 15 bool "IOMMU Hardware Support" 16 depends on MMU 17 default y 18 help 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 22 system. 23 24if IOMMU_SUPPORT 25 26menu "Generic IOMMU Pagetable Support" 27 28# Selected by the actual pagetable implementations 29config IOMMU_IO_PGTABLE 30 bool 31 32config IOMMU_IO_PGTABLE_LPAE 33 bool "ARMv7/v8 Long Descriptor Format" 34 select IOMMU_IO_PGTABLE 35 depends on ARM || ARM64 || COMPILE_TEST 36 depends on !GENERIC_ATOMIC64 # for cmpxchg64() 37 help 38 Enable support for the ARM long descriptor pagetable format. 39 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page 40 sizes at both stage-1 and stage-2, as well as address spaces 41 up to 48-bits in size. 42 43config IOMMU_IO_PGTABLE_LPAE_SELFTEST 44 bool "LPAE selftests" 45 depends on IOMMU_IO_PGTABLE_LPAE 46 help 47 Enable self-tests for LPAE page table allocator. This performs 48 a series of page-table consistency checks during boot. 49 50 If unsure, say N here. 51 52config IOMMU_IO_PGTABLE_ARMV7S 53 bool "ARMv7/v8 Short Descriptor Format" 54 select IOMMU_IO_PGTABLE 55 depends on ARM || ARM64 || COMPILE_TEST 56 help 57 Enable support for the ARM Short-descriptor pagetable format. 58 This supports 32-bit virtual and physical addresses mapped using 59 2-level tables with 4KB pages/1MB sections, and contiguous entries 60 for 64KB pages/16MB supersections if indicated by the IOMMU driver. 61 62config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST 63 bool "ARMv7s selftests" 64 depends on IOMMU_IO_PGTABLE_ARMV7S 65 help 66 Enable self-tests for ARMv7s page table allocator. This performs 67 a series of page-table consistency checks during boot. 68 69 If unsure, say N here. 70 71config IOMMU_IO_PGTABLE_DART 72 bool "Apple DART Formats" 73 select IOMMU_IO_PGTABLE 74 depends on ARM64 || COMPILE_TEST 75 depends on !GENERIC_ATOMIC64 # for cmpxchg64() 76 help 77 Enable support for the Apple DART pagetable formats. These include 78 the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family 79 SoCs. 80 81 If unsure, say N here. 82 83endmenu 84 85config IOMMU_DEBUGFS 86 bool "Export IOMMU internals in DebugFS" 87 depends on DEBUG_FS 88 help 89 Allows exposure of IOMMU device internals. This option enables 90 the use of debugfs by IOMMU drivers as required. Devices can, 91 at initialization time, cause the IOMMU code to create a top-level 92 debug/iommu directory, and then populate a subdirectory with 93 entries as required. 94 95choice 96 prompt "IOMMU default domain type" 97 depends on IOMMU_API 98 default IOMMU_DEFAULT_DMA_LAZY if X86 99 default IOMMU_DEFAULT_DMA_STRICT 100 help 101 Choose the type of IOMMU domain used to manage DMA API usage by 102 device drivers. The options here typically represent different 103 levels of tradeoff between robustness/security and performance, 104 depending on the IOMMU driver. Not all IOMMUs support all options. 105 This choice can be overridden at boot via the command line, and for 106 some devices also at runtime via sysfs. 107 108 If unsure, keep the default. 109 110config IOMMU_DEFAULT_DMA_STRICT 111 bool "Translated - Strict" 112 help 113 Trusted devices use translation to restrict their access to only 114 DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent 115 to passing "iommu.passthrough=0 iommu.strict=1" on the command line. 116 117 Untrusted devices always use this mode, with an additional layer of 118 bounce-buffering such that they cannot gain access to any unrelated 119 data within a mapped page. 120 121config IOMMU_DEFAULT_DMA_LAZY 122 bool "Translated - Lazy" 123 help 124 Trusted devices use translation to restrict their access to only 125 DMA-mapped pages, but with "lazy" batched TLB invalidation. This 126 mode allows higher performance with some IOMMUs due to reduced TLB 127 flushing, but at the cost of reduced isolation since devices may be 128 able to access memory for some time after it has been unmapped. 129 Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the 130 command line. 131 132 If this mode is not supported by the IOMMU driver, the effective 133 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT. 134 135config IOMMU_DEFAULT_PASSTHROUGH 136 bool "Passthrough" 137 help 138 Trusted devices are identity-mapped, giving them unrestricted access 139 to memory with minimal performance overhead. Equivalent to passing 140 "iommu.passthrough=1" (historically "iommu=pt") on the command line. 141 142 If this mode is not supported by the IOMMU driver, the effective 143 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT. 144 145endchoice 146 147config OF_IOMMU 148 def_bool y 149 depends on OF && IOMMU_API 150 151# IOMMU-agnostic DMA-mapping layer 152config IOMMU_DMA 153 def_bool ARM64 || X86 154 select DMA_OPS 155 select IOMMU_API 156 select IOMMU_IOVA 157 select IRQ_MSI_IOMMU 158 select NEED_SG_DMA_LENGTH 159 select NEED_SG_DMA_FLAGS if SWIOTLB 160 161# Shared Virtual Addressing 162config IOMMU_SVA 163 bool 164 165config FSL_PAMU 166 bool "Freescale IOMMU support" 167 depends on PCI 168 depends on PHYS_64BIT 169 depends on PPC_E500MC || (COMPILE_TEST && PPC) 170 select IOMMU_API 171 select GENERIC_ALLOCATOR 172 help 173 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms. 174 PAMU can authorize memory access, remap the memory address, and remap I/O 175 transaction types. 176 177# MSM IOMMU support 178config MSM_IOMMU 179 bool "MSM IOMMU Support" 180 depends on ARM 181 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST 182 select IOMMU_API 183 select IOMMU_IO_PGTABLE_ARMV7S 184 help 185 Support for the IOMMUs found on certain Qualcomm SOCs. 186 These IOMMUs allow virtualization of the address space used by most 187 cores within the multimedia subsystem. 188 189 If unsure, say N here. 190 191source "drivers/iommu/amd/Kconfig" 192source "drivers/iommu/intel/Kconfig" 193source "drivers/iommu/iommufd/Kconfig" 194 195config IRQ_REMAP 196 bool "Support for Interrupt Remapping" 197 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI 198 select DMAR_TABLE 199 help 200 Supports Interrupt remapping for IO-APIC and MSI devices. 201 To use x2apic mode in the CPU's which support x2APIC enhancements or 202 to support platforms with CPU's having > 8 bit APIC ID, say Y. 203 204# OMAP IOMMU support 205config OMAP_IOMMU 206 bool "OMAP IOMMU Support" 207 depends on ARCH_OMAP2PLUS || COMPILE_TEST 208 select IOMMU_API 209 help 210 The OMAP3 media platform drivers depend on iommu support, 211 if you need them say Y here. 212 213config OMAP_IOMMU_DEBUG 214 bool "Export OMAP IOMMU internals in DebugFS" 215 depends on OMAP_IOMMU && DEBUG_FS 216 help 217 Select this to see extensive information about 218 the internal state of OMAP IOMMU in debugfs. 219 220 Say N unless you know you need this. 221 222config ROCKCHIP_IOMMU 223 bool "Rockchip IOMMU Support" 224 depends on ARCH_ROCKCHIP || COMPILE_TEST 225 select IOMMU_API 226 select ARM_DMA_USE_IOMMU 227 help 228 Support for IOMMUs found on Rockchip rk32xx SOCs. 229 These IOMMUs allow virtualization of the address space used by most 230 cores within the multimedia subsystem. 231 Say Y here if you are using a Rockchip SoC that includes an IOMMU 232 device. 233 234config SUN50I_IOMMU 235 bool "Allwinner H6 IOMMU Support" 236 depends on HAS_DMA 237 depends on ARCH_SUNXI || COMPILE_TEST 238 select ARM_DMA_USE_IOMMU 239 select IOMMU_API 240 help 241 Support for the IOMMU introduced in the Allwinner H6 SoCs. 242 243config TEGRA_IOMMU_GART 244 bool "Tegra GART IOMMU Support" 245 depends on ARCH_TEGRA_2x_SOC 246 depends on TEGRA_MC 247 select IOMMU_API 248 help 249 Enables support for remapping discontiguous physical memory 250 shared with the operating system into contiguous I/O virtual 251 space through the GART (Graphics Address Relocation Table) 252 hardware included on Tegra SoCs. 253 254config TEGRA_IOMMU_SMMU 255 bool "NVIDIA Tegra SMMU Support" 256 depends on ARCH_TEGRA 257 depends on TEGRA_AHB 258 depends on TEGRA_MC 259 select IOMMU_API 260 help 261 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra 262 SoCs (Tegra30 up to Tegra210). 263 264config EXYNOS_IOMMU 265 bool "Exynos IOMMU Support" 266 depends on ARCH_EXYNOS || COMPILE_TEST 267 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes 268 select IOMMU_API 269 select ARM_DMA_USE_IOMMU 270 help 271 Support for the IOMMU (System MMU) of Samsung Exynos application 272 processor family. This enables H/W multimedia accelerators to see 273 non-linear physical memory chunks as linear memory in their 274 address space. 275 276 If unsure, say N here. 277 278config EXYNOS_IOMMU_DEBUG 279 bool "Debugging log for Exynos IOMMU" 280 depends on EXYNOS_IOMMU 281 help 282 Select this to see the detailed log message that shows what 283 happens in the IOMMU driver. 284 285 Say N unless you need kernel log message for IOMMU debugging. 286 287config IPMMU_VMSA 288 bool "Renesas VMSA-compatible IPMMU" 289 depends on ARCH_RENESAS || COMPILE_TEST 290 depends on ARM || ARM64 || COMPILE_TEST 291 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE 292 select IOMMU_API 293 select IOMMU_IO_PGTABLE_LPAE 294 select ARM_DMA_USE_IOMMU 295 help 296 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile 297 APE6, R-Car Gen{2,3} and RZ/G{1,2} SoCs. 298 299 If unsure, say N. 300 301config SPAPR_TCE_IOMMU 302 bool "sPAPR TCE IOMMU Support" 303 depends on PPC_POWERNV || PPC_PSERIES 304 select IOMMU_API 305 help 306 Enables bits of IOMMU API required by VFIO. The iommu_ops 307 is not implemented as it is not necessary for VFIO. 308 309config APPLE_DART 310 tristate "Apple DART IOMMU Support" 311 depends on ARCH_APPLE || COMPILE_TEST 312 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART 313 select IOMMU_API 314 select IOMMU_IO_PGTABLE_DART 315 default ARCH_APPLE 316 help 317 Support for Apple DART (Device Address Resolution Table) IOMMUs 318 found in Apple ARM SoCs like the M1. 319 This IOMMU is required for most peripherals using DMA to access 320 the main memory. 321 322 Say Y here if you are using an Apple SoC. 323 324# ARM IOMMU support 325config ARM_SMMU 326 tristate "ARM Ltd. System MMU (SMMU) Support" 327 depends on ARM64 || ARM || COMPILE_TEST 328 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE 329 select IOMMU_API 330 select IOMMU_IO_PGTABLE_LPAE 331 select ARM_DMA_USE_IOMMU if ARM 332 help 333 Support for implementations of the ARM System MMU architecture 334 versions 1 and 2. 335 336 Say Y here if your SoC includes an IOMMU device implementing 337 the ARM SMMU architecture. 338 339config ARM_SMMU_LEGACY_DT_BINDINGS 340 bool "Support the legacy \"mmu-masters\" devicetree bindings" 341 depends on ARM_SMMU=y && OF 342 help 343 Support for the badly designed and deprecated "mmu-masters" 344 devicetree bindings. This allows some DMA masters to attach 345 to the SMMU but does not provide any support via the DMA API. 346 If you're lucky, you might be able to get VFIO up and running. 347 348 If you say Y here then you'll make me very sad. Instead, say N 349 and move your firmware to the utopian future that was 2016. 350 351config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT 352 bool "Default to disabling bypass on ARM SMMU v1 and v2" 353 depends on ARM_SMMU 354 default y 355 help 356 Say Y here to (by default) disable bypass streams such that 357 incoming transactions from devices that are not attached to 358 an iommu domain will report an abort back to the device and 359 will not be allowed to pass through the SMMU. 360 361 Any old kernels that existed before this KConfig was 362 introduced would default to _allowing_ bypass (AKA the 363 equivalent of NO for this config). However the default for 364 this option is YES because the old behavior is insecure. 365 366 There are few reasons to allow unmatched stream bypass, and 367 even fewer good ones. If saying YES here breaks your board 368 you should work on fixing your board. This KConfig option 369 is expected to be removed in the future and we'll simply 370 hardcode the bypass disable in the code. 371 372 NOTE: the kernel command line parameter 373 'arm-smmu.disable_bypass' will continue to override this 374 config. 375 376config ARM_SMMU_QCOM 377 def_tristate y 378 depends on ARM_SMMU && ARCH_QCOM 379 select QCOM_SCM 380 help 381 When running on a Qualcomm platform that has the custom variant 382 of the ARM SMMU, this needs to be built into the SMMU driver. 383 384config ARM_SMMU_QCOM_DEBUG 385 bool "ARM SMMU QCOM implementation defined debug support" 386 depends on ARM_SMMU_QCOM 387 help 388 Support for implementation specific debug features in ARM SMMU 389 hardware found in QTI platforms. 390 391 Say Y here to enable debug for issues such as TLB sync timeouts 392 which requires implementation defined register dumps. 393 394config ARM_SMMU_V3 395 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support" 396 depends on ARM64 397 select IOMMU_API 398 select IOMMU_IO_PGTABLE_LPAE 399 select GENERIC_MSI_IRQ 400 help 401 Support for implementations of the ARM System MMU architecture 402 version 3 providing translation support to a PCIe root complex. 403 404 Say Y here if your system includes an IOMMU device implementing 405 the ARM SMMUv3 architecture. 406 407config ARM_SMMU_V3_SVA 408 bool "Shared Virtual Addressing support for the ARM SMMUv3" 409 depends on ARM_SMMU_V3 410 select IOMMU_SVA 411 select MMU_NOTIFIER 412 help 413 Support for sharing process address spaces with devices using the 414 SMMUv3. 415 416 Say Y here if your system supports SVA extensions such as PCIe PASID 417 and PRI. 418 419config S390_IOMMU 420 def_bool y if S390 && PCI 421 depends on S390 && PCI 422 select IOMMU_API 423 help 424 Support for the IOMMU API for s390 PCI devices. 425 426config MTK_IOMMU 427 tristate "MediaTek IOMMU Support" 428 depends on ARCH_MEDIATEK || COMPILE_TEST 429 select ARM_DMA_USE_IOMMU 430 select IOMMU_API 431 select IOMMU_IO_PGTABLE_ARMV7S 432 select MEMORY 433 select MTK_SMI 434 help 435 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia 436 Memory Management Unit. This option enables remapping of DMA memory 437 accesses for the multimedia subsystem. 438 439 If unsure, say N here. 440 441config MTK_IOMMU_V1 442 tristate "MediaTek IOMMU Version 1 (M4U gen1) Support" 443 depends on ARM 444 depends on ARCH_MEDIATEK || COMPILE_TEST 445 select ARM_DMA_USE_IOMMU 446 select IOMMU_API 447 select MEMORY 448 select MTK_SMI 449 help 450 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is 451 Multimedia Memory Managememt Unit. This option enables remapping of 452 DMA memory accesses for the multimedia subsystem. 453 454 if unsure, say N here. 455 456config QCOM_IOMMU 457 # Note: iommu drivers cannot (yet?) be built as modules 458 bool "Qualcomm IOMMU Support" 459 depends on ARCH_QCOM || COMPILE_TEST 460 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE 461 select QCOM_SCM 462 select IOMMU_API 463 select IOMMU_IO_PGTABLE_LPAE 464 select ARM_DMA_USE_IOMMU 465 help 466 Support for IOMMU on certain Qualcomm SoCs. 467 468config HYPERV_IOMMU 469 bool "Hyper-V IRQ Handling" 470 depends on HYPERV && X86 471 select IOMMU_API 472 default HYPERV 473 help 474 Stub IOMMU driver to handle IRQs to support Hyper-V Linux 475 guest and root partitions. 476 477config VIRTIO_IOMMU 478 tristate "Virtio IOMMU driver" 479 depends on VIRTIO 480 depends on (ARM64 || X86) 481 select IOMMU_API 482 select INTERVAL_TREE 483 select ACPI_VIOT if ACPI 484 help 485 Para-virtualised IOMMU driver with virtio. 486 487 Say Y here if you intend to run this kernel as a guest. 488 489config SPRD_IOMMU 490 tristate "Unisoc IOMMU Support" 491 depends on ARCH_SPRD || COMPILE_TEST 492 select IOMMU_API 493 help 494 Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by 495 Unisoc's multimedia devices, such as display, Image codec(jpeg) 496 and a few signal processors, including VSP(video), GSP(graphic), 497 ISP(image), and CPP(camera pixel processor), etc. 498 499 Say Y here if you want to use the multimedia devices listed above. 500 501endif # IOMMU_SUPPORT 502