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 10menuconfig IOMMU_SUPPORT 11 bool "IOMMU Hardware Support" 12 depends on MMU 13 default y 14 help 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 18 system. 19 20if IOMMU_SUPPORT 21 22menu "Generic IOMMU Pagetable Support" 23 24# Selected by the actual pagetable implementations 25config IOMMU_IO_PGTABLE 26 bool 27 28config IOMMU_IO_PGTABLE_LPAE 29 bool "ARMv7/v8 Long Descriptor Format" 30 select IOMMU_IO_PGTABLE 31 depends on ARM || ARM64 || COMPILE_TEST 32 depends on !GENERIC_ATOMIC64 # for cmpxchg64() 33 help 34 Enable support for the ARM long descriptor pagetable format. 35 This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page 36 sizes at both stage-1 and stage-2, as well as address spaces 37 up to 48-bits in size. 38 39config IOMMU_IO_PGTABLE_LPAE_SELFTEST 40 bool "LPAE selftests" 41 depends on IOMMU_IO_PGTABLE_LPAE 42 help 43 Enable self-tests for LPAE page table allocator. This performs 44 a series of page-table consistency checks during boot. 45 46 If unsure, say N here. 47 48config IOMMU_IO_PGTABLE_ARMV7S 49 bool "ARMv7/v8 Short Descriptor Format" 50 select IOMMU_IO_PGTABLE 51 depends on ARM || ARM64 || COMPILE_TEST 52 help 53 Enable support for the ARM Short-descriptor pagetable format. 54 This supports 32-bit virtual and physical addresses mapped using 55 2-level tables with 4KB pages/1MB sections, and contiguous entries 56 for 64KB pages/16MB supersections if indicated by the IOMMU driver. 57 58config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST 59 bool "ARMv7s selftests" 60 depends on IOMMU_IO_PGTABLE_ARMV7S 61 help 62 Enable self-tests for ARMv7s page table allocator. This performs 63 a series of page-table consistency checks during boot. 64 65 If unsure, say N here. 66 67config IOMMU_IO_PGTABLE_DART 68 bool "Apple DART Formats" 69 select IOMMU_IO_PGTABLE 70 depends on ARM64 || COMPILE_TEST 71 depends on !GENERIC_ATOMIC64 # for cmpxchg64() 72 help 73 Enable support for the Apple DART pagetable formats. These include 74 the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family 75 SoCs. 76 77 If unsure, say N here. 78 79endmenu 80 81config IOMMU_DEBUGFS 82 bool "Export IOMMU internals in DebugFS" 83 depends on DEBUG_FS 84 help 85 Allows exposure of IOMMU device internals. This option enables 86 the use of debugfs by IOMMU drivers as required. Devices can, 87 at initialization time, cause the IOMMU code to create a top-level 88 debug/iommu directory, and then populate a subdirectory with 89 entries as required. 90 91choice 92 prompt "IOMMU default domain type" 93 depends on IOMMU_API 94 default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64 95 default IOMMU_DEFAULT_DMA_STRICT 96 help 97 Choose the type of IOMMU domain used to manage DMA API usage by 98 device drivers. The options here typically represent different 99 levels of tradeoff between robustness/security and performance, 100 depending on the IOMMU driver. Not all IOMMUs support all options. 101 This choice can be overridden at boot via the command line, and for 102 some devices also at runtime via sysfs. 103 104 If unsure, keep the default. 105 106config IOMMU_DEFAULT_DMA_STRICT 107 bool "Translated - Strict" 108 help 109 Trusted devices use translation to restrict their access to only 110 DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent 111 to passing "iommu.passthrough=0 iommu.strict=1" on the command line. 112 113 Untrusted devices always use this mode, with an additional layer of 114 bounce-buffering such that they cannot gain access to any unrelated 115 data within a mapped page. 116 117config IOMMU_DEFAULT_DMA_LAZY 118 bool "Translated - Lazy" 119 help 120 Trusted devices use translation to restrict their access to only 121 DMA-mapped pages, but with "lazy" batched TLB invalidation. This 122 mode allows higher performance with some IOMMUs due to reduced TLB 123 flushing, but at the cost of reduced isolation since devices may be 124 able to access memory for some time after it has been unmapped. 125 Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the 126 command line. 127 128 If this mode is not supported by the IOMMU driver, the effective 129 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT. 130 131config IOMMU_DEFAULT_PASSTHROUGH 132 bool "Passthrough" 133 help 134 Trusted devices are identity-mapped, giving them unrestricted access 135 to memory with minimal performance overhead. Equivalent to passing 136 "iommu.passthrough=1" (historically "iommu=pt") on the command line. 137 138 If this mode is not supported by the IOMMU driver, the effective 139 runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT. 140 141endchoice 142 143config OF_IOMMU 144 def_bool y 145 depends on OF && IOMMU_API 146 147# IOMMU-agnostic DMA-mapping layer 148config IOMMU_DMA 149 def_bool ARM64 || IA64 || X86 150 select DMA_OPS 151 select IOMMU_API 152 select IOMMU_IOVA 153 select IRQ_MSI_IOMMU 154 select NEED_SG_DMA_LENGTH 155 156# Shared Virtual Addressing 157config IOMMU_SVA 158 bool 159 160config FSL_PAMU 161 bool "Freescale IOMMU support" 162 depends on PCI 163 depends on PHYS_64BIT 164 depends on PPC_E500MC || (COMPILE_TEST && PPC) 165 select IOMMU_API 166 select GENERIC_ALLOCATOR 167 help 168 Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms. 169 PAMU can authorize memory access, remap the memory address, and remap I/O 170 transaction types. 171 172# MSM IOMMU support 173config MSM_IOMMU 174 bool "MSM IOMMU Support" 175 depends on ARM 176 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST 177 select IOMMU_API 178 select IOMMU_IO_PGTABLE_ARMV7S 179 help 180 Support for the IOMMUs found on certain Qualcomm SOCs. 181 These IOMMUs allow virtualization of the address space used by most 182 cores within the multimedia subsystem. 183 184 If unsure, say N here. 185 186source "drivers/iommu/amd/Kconfig" 187source "drivers/iommu/intel/Kconfig" 188source "drivers/iommu/iommufd/Kconfig" 189 190config IRQ_REMAP 191 bool "Support for Interrupt Remapping" 192 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI 193 select DMAR_TABLE 194 help 195 Supports Interrupt remapping for IO-APIC and MSI devices. 196 To use x2apic mode in the CPU's which support x2APIC enhancements or 197 to support platforms with CPU's having > 8 bit APIC ID, say Y. 198 199# OMAP IOMMU support 200config OMAP_IOMMU 201 bool "OMAP IOMMU Support" 202 depends on ARCH_OMAP2PLUS || COMPILE_TEST 203 select IOMMU_API 204 help 205 The OMAP3 media platform drivers depend on iommu support, 206 if you need them say Y here. 207 208config OMAP_IOMMU_DEBUG 209 bool "Export OMAP IOMMU internals in DebugFS" 210 depends on OMAP_IOMMU && DEBUG_FS 211 help 212 Select this to see extensive information about 213 the internal state of OMAP IOMMU in debugfs. 214 215 Say N unless you know you need this. 216 217config ROCKCHIP_IOMMU 218 bool "Rockchip IOMMU Support" 219 depends on ARCH_ROCKCHIP || COMPILE_TEST 220 select IOMMU_API 221 select ARM_DMA_USE_IOMMU 222 help 223 Support for IOMMUs found on Rockchip rk32xx SOCs. 224 These IOMMUs allow virtualization of the address space used by most 225 cores within the multimedia subsystem. 226 Say Y here if you are using a Rockchip SoC that includes an IOMMU 227 device. 228 229config SUN50I_IOMMU 230 bool "Allwinner H6 IOMMU Support" 231 depends on HAS_DMA 232 depends on ARCH_SUNXI || COMPILE_TEST 233 select ARM_DMA_USE_IOMMU 234 select IOMMU_API 235 help 236 Support for the IOMMU introduced in the Allwinner H6 SoCs. 237 238config TEGRA_IOMMU_GART 239 bool "Tegra GART IOMMU Support" 240 depends on ARCH_TEGRA_2x_SOC 241 depends on TEGRA_MC 242 select IOMMU_API 243 help 244 Enables support for remapping discontiguous physical memory 245 shared with the operating system into contiguous I/O virtual 246 space through the GART (Graphics Address Relocation Table) 247 hardware included on Tegra SoCs. 248 249config TEGRA_IOMMU_SMMU 250 bool "NVIDIA Tegra SMMU Support" 251 depends on ARCH_TEGRA 252 depends on TEGRA_AHB 253 depends on TEGRA_MC 254 select IOMMU_API 255 help 256 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra 257 SoCs (Tegra30 up to Tegra210). 258 259config EXYNOS_IOMMU 260 bool "Exynos IOMMU Support" 261 depends on ARCH_EXYNOS || COMPILE_TEST 262 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes 263 select IOMMU_API 264 select ARM_DMA_USE_IOMMU 265 help 266 Support for the IOMMU (System MMU) of Samsung Exynos application 267 processor family. This enables H/W multimedia accelerators to see 268 non-linear physical memory chunks as linear memory in their 269 address space. 270 271 If unsure, say N here. 272 273config EXYNOS_IOMMU_DEBUG 274 bool "Debugging log for Exynos IOMMU" 275 depends on EXYNOS_IOMMU 276 help 277 Select this to see the detailed log message that shows what 278 happens in the IOMMU driver. 279 280 Say N unless you need kernel log message for IOMMU debugging. 281 282config IPMMU_VMSA 283 bool "Renesas VMSA-compatible IPMMU" 284 depends on ARCH_RENESAS || COMPILE_TEST 285 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE 286 select IOMMU_API 287 select IOMMU_IO_PGTABLE_LPAE 288 select ARM_DMA_USE_IOMMU 289 help 290 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile 291 APE6, R-Car Gen{2,3} and RZ/G{1,2} SoCs. 292 293 If unsure, say N. 294 295config SPAPR_TCE_IOMMU 296 bool "sPAPR TCE IOMMU Support" 297 depends on PPC_POWERNV || PPC_PSERIES 298 select IOMMU_API 299 help 300 Enables bits of IOMMU API required by VFIO. The iommu_ops 301 is not implemented as it is not necessary for VFIO. 302 303config APPLE_DART 304 tristate "Apple DART IOMMU Support" 305 depends on ARCH_APPLE || COMPILE_TEST 306 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART 307 select IOMMU_API 308 select IOMMU_IO_PGTABLE_DART 309 default ARCH_APPLE 310 help 311 Support for Apple DART (Device Address Resolution Table) IOMMUs 312 found in Apple ARM SoCs like the M1. 313 This IOMMU is required for most peripherals using DMA to access 314 the main memory. 315 316 Say Y here if you are using an Apple SoC. 317 318# ARM IOMMU support 319config ARM_SMMU 320 tristate "ARM Ltd. System MMU (SMMU) Support" 321 depends on ARM64 || ARM || COMPILE_TEST 322 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE 323 select IOMMU_API 324 select IOMMU_IO_PGTABLE_LPAE 325 select ARM_DMA_USE_IOMMU if ARM 326 help 327 Support for implementations of the ARM System MMU architecture 328 versions 1 and 2. 329 330 Say Y here if your SoC includes an IOMMU device implementing 331 the ARM SMMU architecture. 332 333config ARM_SMMU_LEGACY_DT_BINDINGS 334 bool "Support the legacy \"mmu-masters\" devicetree bindings" 335 depends on ARM_SMMU=y && OF 336 help 337 Support for the badly designed and deprecated "mmu-masters" 338 devicetree bindings. This allows some DMA masters to attach 339 to the SMMU but does not provide any support via the DMA API. 340 If you're lucky, you might be able to get VFIO up and running. 341 342 If you say Y here then you'll make me very sad. Instead, say N 343 and move your firmware to the utopian future that was 2016. 344 345config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT 346 bool "Default to disabling bypass on ARM SMMU v1 and v2" 347 depends on ARM_SMMU 348 default y 349 help 350 Say Y here to (by default) disable bypass streams such that 351 incoming transactions from devices that are not attached to 352 an iommu domain will report an abort back to the device and 353 will not be allowed to pass through the SMMU. 354 355 Any old kernels that existed before this KConfig was 356 introduced would default to _allowing_ bypass (AKA the 357 equivalent of NO for this config). However the default for 358 this option is YES because the old behavior is insecure. 359 360 There are few reasons to allow unmatched stream bypass, and 361 even fewer good ones. If saying YES here breaks your board 362 you should work on fixing your board. This KConfig option 363 is expected to be removed in the future and we'll simply 364 hardcode the bypass disable in the code. 365 366 NOTE: the kernel command line parameter 367 'arm-smmu.disable_bypass' will continue to override this 368 config. 369 370config ARM_SMMU_QCOM 371 def_tristate y 372 depends on ARM_SMMU && ARCH_QCOM 373 select QCOM_SCM 374 help 375 When running on a Qualcomm platform that has the custom variant 376 of the ARM SMMU, this needs to be built into the SMMU driver. 377 378config ARM_SMMU_QCOM_DEBUG 379 bool "ARM SMMU QCOM implementation defined debug support" 380 depends on ARM_SMMU_QCOM 381 help 382 Support for implementation specific debug features in ARM SMMU 383 hardware found in QTI platforms. 384 385 Say Y here to enable debug for issues such as TLB sync timeouts 386 which requires implementation defined register dumps. 387 388config ARM_SMMU_V3 389 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support" 390 depends on ARM64 391 select IOMMU_API 392 select IOMMU_IO_PGTABLE_LPAE 393 select GENERIC_MSI_IRQ 394 help 395 Support for implementations of the ARM System MMU architecture 396 version 3 providing translation support to a PCIe root complex. 397 398 Say Y here if your system includes an IOMMU device implementing 399 the ARM SMMUv3 architecture. 400 401config ARM_SMMU_V3_SVA 402 bool "Shared Virtual Addressing support for the ARM SMMUv3" 403 depends on ARM_SMMU_V3 404 select IOMMU_SVA 405 select MMU_NOTIFIER 406 help 407 Support for sharing process address spaces with devices using the 408 SMMUv3. 409 410 Say Y here if your system supports SVA extensions such as PCIe PASID 411 and PRI. 412 413config S390_IOMMU 414 def_bool y if S390 && PCI 415 depends on S390 && PCI 416 select IOMMU_API 417 help 418 Support for the IOMMU API for s390 PCI devices. 419 420config MTK_IOMMU 421 tristate "MediaTek IOMMU Support" 422 depends on ARCH_MEDIATEK || COMPILE_TEST 423 select ARM_DMA_USE_IOMMU 424 select IOMMU_API 425 select IOMMU_IO_PGTABLE_ARMV7S 426 select MEMORY 427 select MTK_SMI 428 help 429 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia 430 Memory Management Unit. This option enables remapping of DMA memory 431 accesses for the multimedia subsystem. 432 433 If unsure, say N here. 434 435config MTK_IOMMU_V1 436 tristate "MediaTek IOMMU Version 1 (M4U gen1) Support" 437 depends on ARM 438 depends on ARCH_MEDIATEK || COMPILE_TEST 439 select ARM_DMA_USE_IOMMU 440 select IOMMU_API 441 select MEMORY 442 select MTK_SMI 443 help 444 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is 445 Multimedia Memory Managememt Unit. This option enables remapping of 446 DMA memory accesses for the multimedia subsystem. 447 448 if unsure, say N here. 449 450config QCOM_IOMMU 451 # Note: iommu drivers cannot (yet?) be built as modules 452 bool "Qualcomm IOMMU Support" 453 depends on ARCH_QCOM || COMPILE_TEST 454 depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE 455 select QCOM_SCM 456 select IOMMU_API 457 select IOMMU_IO_PGTABLE_LPAE 458 select ARM_DMA_USE_IOMMU 459 help 460 Support for IOMMU on certain Qualcomm SoCs. 461 462config HYPERV_IOMMU 463 bool "Hyper-V IRQ Handling" 464 depends on HYPERV && X86 465 select IOMMU_API 466 default HYPERV 467 help 468 Stub IOMMU driver to handle IRQs to support Hyper-V Linux 469 guest and root partitions. 470 471config VIRTIO_IOMMU 472 tristate "Virtio IOMMU driver" 473 depends on VIRTIO 474 depends on (ARM64 || X86) 475 select IOMMU_API 476 select INTERVAL_TREE 477 select ACPI_VIOT if ACPI 478 help 479 Para-virtualised IOMMU driver with virtio. 480 481 Say Y here if you intend to run this kernel as a guest. 482 483config SPRD_IOMMU 484 tristate "Unisoc IOMMU Support" 485 depends on ARCH_SPRD || COMPILE_TEST 486 select IOMMU_API 487 help 488 Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by 489 Unisoc's multimedia devices, such as display, Image codec(jpeg) 490 and a few signal processors, including VSP(video), GSP(graphic), 491 ISP(image), and CPP(camera pixel processor), etc. 492 493 Say Y here if you want to use the multimedia devices listed above. 494 495endif # IOMMU_SUPPORT 496