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# The IOASID library may also be used by non-IOMMU_API users 7config IOASID 8 tristate 9 10# IOMMU_API always gets selected by whoever wants it. 11config IOMMU_API 12 bool 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 && !GENERIC_ATOMIC64) 36 help 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. 41 42config IOMMU_IO_PGTABLE_LPAE_SELFTEST 43 bool "LPAE selftests" 44 depends on IOMMU_IO_PGTABLE_LPAE 45 help 46 Enable self-tests for LPAE page table allocator. This performs 47 a series of page-table consistency checks during boot. 48 49 If unsure, say N here. 50 51config IOMMU_IO_PGTABLE_ARMV7S 52 bool "ARMv7/v8 Short Descriptor Format" 53 select IOMMU_IO_PGTABLE 54 depends on ARM || ARM64 || COMPILE_TEST 55 help 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. 60 61config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST 62 bool "ARMv7s selftests" 63 depends on IOMMU_IO_PGTABLE_ARMV7S 64 help 65 Enable self-tests for ARMv7s page table allocator. This performs 66 a series of page-table consistency checks during boot. 67 68 If unsure, say N here. 69 70endmenu 71 72config IOMMU_DEBUGFS 73 bool "Export IOMMU internals in DebugFS" 74 depends on DEBUG_FS 75 help 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 80 entries as required. 81 82config IOMMU_DEFAULT_PASSTHROUGH 83 bool "IOMMU passthrough by default" 84 depends on IOMMU_API 85 help 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. 90 91 If unsure, say N here. 92 93config OF_IOMMU 94 def_bool y 95 depends on OF && IOMMU_API 96 97# IOMMU-agnostic DMA-mapping layer 98config IOMMU_DMA 99 bool 100 select IOMMU_API 101 select IOMMU_IOVA 102 select IRQ_MSI_IOMMU 103 select NEED_SG_DMA_LENGTH 104 105config FSL_PAMU 106 bool "Freescale IOMMU support" 107 depends on PCI 108 depends on PHYS_64BIT 109 depends on PPC_E500MC || (COMPILE_TEST && PPC) 110 select IOMMU_API 111 select GENERIC_ALLOCATOR 112 help 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 115 transaction types. 116 117# MSM IOMMU support 118config MSM_IOMMU 119 bool "MSM IOMMU Support" 120 depends on ARM 121 depends on ARCH_MSM8X60 || ARCH_MSM8960 || COMPILE_TEST 122 select IOMMU_API 123 select IOMMU_IO_PGTABLE_ARMV7S 124 help 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. 128 129 If unsure, say N here. 130 131config IOMMU_PGTABLES_L2 132 def_bool y 133 depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n 134 135# AMD IOMMU support 136config AMD_IOMMU 137 bool "AMD IOMMU support" 138 select SWIOTLB 139 select PCI_MSI 140 select PCI_ATS 141 select PCI_PRI 142 select PCI_PASID 143 select IOMMU_API 144 select IOMMU_IOVA 145 select IOMMU_DMA 146 depends on X86_64 && PCI && ACPI 147 help 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. 153 154 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 156 table. 157 158config AMD_IOMMU_V2 159 tristate "AMD IOMMU Version 2 driver" 160 depends on AMD_IOMMU 161 select MMU_NOTIFIER 162 help 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. 166 167config AMD_IOMMU_DEBUGFS 168 bool "Enable AMD IOMMU internals in DebugFS" 169 depends on AMD_IOMMU && IOMMU_DEBUGFS 170 help 171 !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! !!!WARNING!!! 172 173 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!! 174 Exposes AMD IOMMU device internals in DebugFS. 175 176 This option is -NOT- intended for production environments, and should 177 not generally be enabled. 178 179# Intel IOMMU support 180config DMAR_TABLE 181 bool 182 183config INTEL_IOMMU 184 bool "Support for Intel IOMMU using DMA Remapping Devices" 185 depends on PCI_MSI && ACPI && (X86 || IA64) 186 select IOMMU_API 187 select IOMMU_IOVA 188 select NEED_DMA_MAP_STATE 189 select DMAR_TABLE 190 select SWIOTLB 191 select IOASID 192 help 193 DMA remapping (DMAR) devices support enables independent address 194 translations for Direct Memory Access (DMA) from devices. 195 These DMA remapping devices are reported via ACPI tables 196 and include PCI device scope covered by these DMA 197 remapping devices. 198 199config INTEL_IOMMU_DEBUGFS 200 bool "Export Intel IOMMU internals in Debugfs" 201 depends on INTEL_IOMMU && IOMMU_DEBUGFS 202 help 203 !!!WARNING!!! 204 205 DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!!! 206 207 Expose Intel IOMMU internals in Debugfs. 208 209 This option is -NOT- intended for production environments, and should 210 only be enabled for debugging Intel IOMMU. 211 212config INTEL_IOMMU_SVM 213 bool "Support for Shared Virtual Memory with Intel IOMMU" 214 depends on INTEL_IOMMU && X86 215 select PCI_PASID 216 select PCI_PRI 217 select MMU_NOTIFIER 218 select IOASID 219 help 220 Shared Virtual Memory (SVM) provides a facility for devices 221 to access DMA resources through process address space by 222 means of a Process Address Space ID (PASID). 223 224config INTEL_IOMMU_DEFAULT_ON 225 def_bool y 226 prompt "Enable Intel DMA Remapping Devices by default" 227 depends on INTEL_IOMMU 228 help 229 Selecting this option will enable a DMAR device at boot time if 230 one is found. If this option is not selected, DMAR support can 231 be enabled by passing intel_iommu=on to the kernel. 232 233config INTEL_IOMMU_BROKEN_GFX_WA 234 bool "Workaround broken graphics drivers (going away soon)" 235 depends on INTEL_IOMMU && BROKEN && X86 236 help 237 Current Graphics drivers tend to use physical address 238 for DMA and avoid using DMA APIs. Setting this config 239 option permits the IOMMU driver to set a unity map for 240 all the OS-visible memory. Hence the driver can continue 241 to use physical addresses for DMA, at least until this 242 option is removed in the 2.6.32 kernel. 243 244config INTEL_IOMMU_FLOPPY_WA 245 def_bool y 246 depends on INTEL_IOMMU && X86 247 help 248 Floppy disk drivers are known to bypass DMA API calls 249 thereby failing to work when IOMMU is enabled. This 250 workaround will setup a 1:1 mapping for the first 251 16MiB to make floppy (an ISA device) work. 252 253config INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON 254 bool "Enable Intel IOMMU scalable mode by default" 255 depends on INTEL_IOMMU 256 help 257 Selecting this option will enable by default the scalable mode if 258 hardware presents the capability. The scalable mode is defined in 259 VT-d 3.0. The scalable mode capability could be checked by reading 260 /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option 261 is not selected, scalable mode support could also be enabled by 262 passing intel_iommu=sm_on to the kernel. If not sure, please use 263 the default value. 264 265config IRQ_REMAP 266 bool "Support for Interrupt Remapping" 267 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI 268 select DMAR_TABLE 269 help 270 Supports Interrupt remapping for IO-APIC and MSI devices. 271 To use x2apic mode in the CPU's which support x2APIC enhancements or 272 to support platforms with CPU's having > 8 bit APIC ID, say Y. 273 274# OMAP IOMMU support 275config OMAP_IOMMU 276 bool "OMAP IOMMU Support" 277 depends on ARM && MMU || (COMPILE_TEST && (ARM || ARM64 || IA64 || SPARC)) 278 depends on ARCH_OMAP2PLUS || COMPILE_TEST 279 select IOMMU_API 280 help 281 The OMAP3 media platform drivers depend on iommu support, 282 if you need them say Y here. 283 284config OMAP_IOMMU_DEBUG 285 bool "Export OMAP IOMMU internals in DebugFS" 286 depends on OMAP_IOMMU && DEBUG_FS 287 help 288 Select this to see extensive information about 289 the internal state of OMAP IOMMU in debugfs. 290 291 Say N unless you know you need this. 292 293config ROCKCHIP_IOMMU 294 bool "Rockchip IOMMU Support" 295 depends on ARM || ARM64 || (COMPILE_TEST && (ARM64 || IA64 || SPARC)) 296 depends on ARCH_ROCKCHIP || COMPILE_TEST 297 select IOMMU_API 298 select ARM_DMA_USE_IOMMU 299 help 300 Support for IOMMUs found on Rockchip rk32xx SOCs. 301 These IOMMUs allow virtualization of the address space used by most 302 cores within the multimedia subsystem. 303 Say Y here if you are using a Rockchip SoC that includes an IOMMU 304 device. 305 306config SUN50I_IOMMU 307 bool "Allwinner H6 IOMMU Support" 308 depends on ARCH_SUNXI || COMPILE_TEST 309 select ARM_DMA_USE_IOMMU 310 select IOMMU_API 311 select IOMMU_DMA 312 help 313 Support for the IOMMU introduced in the Allwinner H6 SoCs. 314 315config TEGRA_IOMMU_GART 316 bool "Tegra GART IOMMU Support" 317 depends on ARCH_TEGRA_2x_SOC 318 depends on TEGRA_MC 319 select IOMMU_API 320 help 321 Enables support for remapping discontiguous physical memory 322 shared with the operating system into contiguous I/O virtual 323 space through the GART (Graphics Address Relocation Table) 324 hardware included on Tegra SoCs. 325 326config TEGRA_IOMMU_SMMU 327 bool "NVIDIA Tegra SMMU Support" 328 depends on ARCH_TEGRA 329 depends on TEGRA_AHB 330 depends on TEGRA_MC 331 select IOMMU_API 332 help 333 This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra 334 SoCs (Tegra30 up to Tegra210). 335 336config EXYNOS_IOMMU 337 bool "Exynos IOMMU Support" 338 depends on ARCH_EXYNOS && MMU || (COMPILE_TEST && (ARM || ARM64 || IA64 || SPARC)) 339 depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes 340 select IOMMU_API 341 select ARM_DMA_USE_IOMMU 342 help 343 Support for the IOMMU (System MMU) of Samsung Exynos application 344 processor family. This enables H/W multimedia accelerators to see 345 non-linear physical memory chunks as linear memory in their 346 address space. 347 348 If unsure, say N here. 349 350config EXYNOS_IOMMU_DEBUG 351 bool "Debugging log for Exynos IOMMU" 352 depends on EXYNOS_IOMMU 353 help 354 Select this to see the detailed log message that shows what 355 happens in the IOMMU driver. 356 357 Say N unless you need kernel log message for IOMMU debugging. 358 359config IPMMU_VMSA 360 bool "Renesas VMSA-compatible IPMMU" 361 depends on ARM || IOMMU_DMA 362 depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64) 363 select IOMMU_API 364 select IOMMU_IO_PGTABLE_LPAE 365 select ARM_DMA_USE_IOMMU 366 help 367 Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile 368 APE6, R-Car Gen2, and R-Car Gen3 SoCs. 369 370 If unsure, say N. 371 372config SPAPR_TCE_IOMMU 373 bool "sPAPR TCE IOMMU Support" 374 depends on PPC_POWERNV || PPC_PSERIES 375 select IOMMU_API 376 help 377 Enables bits of IOMMU API required by VFIO. The iommu_ops 378 is not implemented as it is not necessary for VFIO. 379 380# ARM IOMMU support 381config ARM_SMMU 382 tristate "ARM Ltd. System MMU (SMMU) Support" 383 depends on (ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)) && MMU 384 select IOMMU_API 385 select IOMMU_IO_PGTABLE_LPAE 386 select ARM_DMA_USE_IOMMU if ARM 387 help 388 Support for implementations of the ARM System MMU architecture 389 versions 1 and 2. 390 391 Say Y here if your SoC includes an IOMMU device implementing 392 the ARM SMMU architecture. 393 394config ARM_SMMU_LEGACY_DT_BINDINGS 395 bool "Support the legacy \"mmu-masters\" devicetree bindings" 396 depends on ARM_SMMU=y && OF 397 help 398 Support for the badly designed and deprecated "mmu-masters" 399 devicetree bindings. This allows some DMA masters to attach 400 to the SMMU but does not provide any support via the DMA API. 401 If you're lucky, you might be able to get VFIO up and running. 402 403 If you say Y here then you'll make me very sad. Instead, say N 404 and move your firmware to the utopian future that was 2016. 405 406config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT 407 bool "Default to disabling bypass on ARM SMMU v1 and v2" 408 depends on ARM_SMMU 409 default y 410 help 411 Say Y here to (by default) disable bypass streams such that 412 incoming transactions from devices that are not attached to 413 an iommu domain will report an abort back to the device and 414 will not be allowed to pass through the SMMU. 415 416 Any old kernels that existed before this KConfig was 417 introduced would default to _allowing_ bypass (AKA the 418 equivalent of NO for this config). However the default for 419 this option is YES because the old behavior is insecure. 420 421 There are few reasons to allow unmatched stream bypass, and 422 even fewer good ones. If saying YES here breaks your board 423 you should work on fixing your board. This KConfig option 424 is expected to be removed in the future and we'll simply 425 hardcode the bypass disable in the code. 426 427 NOTE: the kernel command line parameter 428 'arm-smmu.disable_bypass' will continue to override this 429 config. 430 431config ARM_SMMU_V3 432 tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support" 433 depends on ARM64 434 select IOMMU_API 435 select IOMMU_IO_PGTABLE_LPAE 436 select GENERIC_MSI_IRQ_DOMAIN 437 help 438 Support for implementations of the ARM System MMU architecture 439 version 3 providing translation support to a PCIe root complex. 440 441 Say Y here if your system includes an IOMMU device implementing 442 the ARM SMMUv3 architecture. 443 444config S390_IOMMU 445 def_bool y if S390 && PCI 446 depends on S390 && PCI 447 select IOMMU_API 448 help 449 Support for the IOMMU API for s390 PCI devices. 450 451config S390_CCW_IOMMU 452 bool "S390 CCW IOMMU Support" 453 depends on S390 && CCW || COMPILE_TEST 454 select IOMMU_API 455 help 456 Enables bits of IOMMU API required by VFIO. The iommu_ops 457 is not implemented as it is not necessary for VFIO. 458 459config S390_AP_IOMMU 460 bool "S390 AP IOMMU Support" 461 depends on S390 && ZCRYPT || COMPILE_TEST 462 select IOMMU_API 463 help 464 Enables bits of IOMMU API required by VFIO. The iommu_ops 465 is not implemented as it is not necessary for VFIO. 466 467config MTK_IOMMU 468 bool "MTK IOMMU Support" 469 depends on HAS_DMA 470 depends on ARCH_MEDIATEK || COMPILE_TEST 471 select ARM_DMA_USE_IOMMU 472 select IOMMU_API 473 select IOMMU_DMA 474 select IOMMU_IO_PGTABLE_ARMV7S 475 select MEMORY 476 select MTK_SMI 477 help 478 Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia 479 Memory Management Unit. This option enables remapping of DMA memory 480 accesses for the multimedia subsystem. 481 482 If unsure, say N here. 483 484config MTK_IOMMU_V1 485 bool "MTK IOMMU Version 1 (M4U gen1) Support" 486 depends on ARM 487 depends on ARCH_MEDIATEK || COMPILE_TEST 488 select ARM_DMA_USE_IOMMU 489 select IOMMU_API 490 select MEMORY 491 select MTK_SMI 492 help 493 Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is 494 Multimedia Memory Managememt Unit. This option enables remapping of 495 DMA memory accesses for the multimedia subsystem. 496 497 if unsure, say N here. 498 499config QCOM_IOMMU 500 # Note: iommu drivers cannot (yet?) be built as modules 501 bool "Qualcomm IOMMU Support" 502 depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64) 503 select IOMMU_API 504 select IOMMU_IO_PGTABLE_LPAE 505 select ARM_DMA_USE_IOMMU 506 help 507 Support for IOMMU on certain Qualcomm SoCs. 508 509config HYPERV_IOMMU 510 bool "Hyper-V x2APIC IRQ Handling" 511 depends on HYPERV && X86 512 select IOMMU_API 513 default HYPERV 514 help 515 Stub IOMMU driver to handle IRQs as to allow Hyper-V Linux 516 guests to run with x2APIC mode enabled. 517 518config VIRTIO_IOMMU 519 tristate "Virtio IOMMU driver" 520 depends on VIRTIO 521 depends on ARM64 522 select IOMMU_API 523 select INTERVAL_TREE 524 help 525 Para-virtualised IOMMU driver with virtio. 526 527 Say Y here if you intend to run this kernel as a guest. 528 529endif # IOMMU_SUPPORT 530