1 /* 2 * VFIO API definition 3 * 4 * Copyright (C) 2012 Red Hat, Inc. All rights reserved. 5 * Author: Alex Williamson <alex.williamson@redhat.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #ifndef VFIO_H 12 #define VFIO_H 13 14 #include <linux/types.h> 15 #include <linux/ioctl.h> 16 17 #define VFIO_API_VERSION 0 18 19 20 /* Kernel & User level defines for VFIO IOCTLs. */ 21 22 /* Extensions */ 23 24 #define VFIO_TYPE1_IOMMU 1 25 #define VFIO_SPAPR_TCE_IOMMU 2 26 #define VFIO_TYPE1v2_IOMMU 3 27 /* 28 * IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping). This 29 * capability is subject to change as groups are added or removed. 30 */ 31 #define VFIO_DMA_CC_IOMMU 4 32 33 /* Check if EEH is supported */ 34 #define VFIO_EEH 5 35 36 /* Two-stage IOMMU */ 37 #define VFIO_TYPE1_NESTING_IOMMU 6 /* Implies v2 */ 38 39 /* 40 * The IOCTL interface is designed for extensibility by embedding the 41 * structure length (argsz) and flags into structures passed between 42 * kernel and userspace. We therefore use the _IO() macro for these 43 * defines to avoid implicitly embedding a size into the ioctl request. 44 * As structure fields are added, argsz will increase to match and flag 45 * bits will be defined to indicate additional fields with valid data. 46 * It's *always* the caller's responsibility to indicate the size of 47 * the structure passed by setting argsz appropriately. 48 */ 49 50 #define VFIO_TYPE (';') 51 #define VFIO_BASE 100 52 53 /* -------- IOCTLs for VFIO file descriptor (/dev/vfio/vfio) -------- */ 54 55 /** 56 * VFIO_GET_API_VERSION - _IO(VFIO_TYPE, VFIO_BASE + 0) 57 * 58 * Report the version of the VFIO API. This allows us to bump the entire 59 * API version should we later need to add or change features in incompatible 60 * ways. 61 * Return: VFIO_API_VERSION 62 * Availability: Always 63 */ 64 #define VFIO_GET_API_VERSION _IO(VFIO_TYPE, VFIO_BASE + 0) 65 66 /** 67 * VFIO_CHECK_EXTENSION - _IOW(VFIO_TYPE, VFIO_BASE + 1, __u32) 68 * 69 * Check whether an extension is supported. 70 * Return: 0 if not supported, 1 (or some other positive integer) if supported. 71 * Availability: Always 72 */ 73 #define VFIO_CHECK_EXTENSION _IO(VFIO_TYPE, VFIO_BASE + 1) 74 75 /** 76 * VFIO_SET_IOMMU - _IOW(VFIO_TYPE, VFIO_BASE + 2, __s32) 77 * 78 * Set the iommu to the given type. The type must be supported by an 79 * iommu driver as verified by calling CHECK_EXTENSION using the same 80 * type. A group must be set to this file descriptor before this 81 * ioctl is available. The IOMMU interfaces enabled by this call are 82 * specific to the value set. 83 * Return: 0 on success, -errno on failure 84 * Availability: When VFIO group attached 85 */ 86 #define VFIO_SET_IOMMU _IO(VFIO_TYPE, VFIO_BASE + 2) 87 88 /* -------- IOCTLs for GROUP file descriptors (/dev/vfio/$GROUP) -------- */ 89 90 /** 91 * VFIO_GROUP_GET_STATUS - _IOR(VFIO_TYPE, VFIO_BASE + 3, 92 * struct vfio_group_status) 93 * 94 * Retrieve information about the group. Fills in provided 95 * struct vfio_group_info. Caller sets argsz. 96 * Return: 0 on succes, -errno on failure. 97 * Availability: Always 98 */ 99 struct vfio_group_status { 100 __u32 argsz; 101 __u32 flags; 102 #define VFIO_GROUP_FLAGS_VIABLE (1 << 0) 103 #define VFIO_GROUP_FLAGS_CONTAINER_SET (1 << 1) 104 }; 105 #define VFIO_GROUP_GET_STATUS _IO(VFIO_TYPE, VFIO_BASE + 3) 106 107 /** 108 * VFIO_GROUP_SET_CONTAINER - _IOW(VFIO_TYPE, VFIO_BASE + 4, __s32) 109 * 110 * Set the container for the VFIO group to the open VFIO file 111 * descriptor provided. Groups may only belong to a single 112 * container. Containers may, at their discretion, support multiple 113 * groups. Only when a container is set are all of the interfaces 114 * of the VFIO file descriptor and the VFIO group file descriptor 115 * available to the user. 116 * Return: 0 on success, -errno on failure. 117 * Availability: Always 118 */ 119 #define VFIO_GROUP_SET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 4) 120 121 /** 122 * VFIO_GROUP_UNSET_CONTAINER - _IO(VFIO_TYPE, VFIO_BASE + 5) 123 * 124 * Remove the group from the attached container. This is the 125 * opposite of the SET_CONTAINER call and returns the group to 126 * an initial state. All device file descriptors must be released 127 * prior to calling this interface. When removing the last group 128 * from a container, the IOMMU will be disabled and all state lost, 129 * effectively also returning the VFIO file descriptor to an initial 130 * state. 131 * Return: 0 on success, -errno on failure. 132 * Availability: When attached to container 133 */ 134 #define VFIO_GROUP_UNSET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 5) 135 136 /** 137 * VFIO_GROUP_GET_DEVICE_FD - _IOW(VFIO_TYPE, VFIO_BASE + 6, char) 138 * 139 * Return a new file descriptor for the device object described by 140 * the provided string. The string should match a device listed in 141 * the devices subdirectory of the IOMMU group sysfs entry. The 142 * group containing the device must already be added to this context. 143 * Return: new file descriptor on success, -errno on failure. 144 * Availability: When attached to container 145 */ 146 #define VFIO_GROUP_GET_DEVICE_FD _IO(VFIO_TYPE, VFIO_BASE + 6) 147 148 /* --------------- IOCTLs for DEVICE file descriptors --------------- */ 149 150 /** 151 * VFIO_DEVICE_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 7, 152 * struct vfio_device_info) 153 * 154 * Retrieve information about the device. Fills in provided 155 * struct vfio_device_info. Caller sets argsz. 156 * Return: 0 on success, -errno on failure. 157 */ 158 struct vfio_device_info { 159 __u32 argsz; 160 __u32 flags; 161 #define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */ 162 #define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */ 163 #define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */ 164 #define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */ 165 __u32 num_regions; /* Max region index + 1 */ 166 __u32 num_irqs; /* Max IRQ index + 1 */ 167 }; 168 #define VFIO_DEVICE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 7) 169 170 /** 171 * VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8, 172 * struct vfio_region_info) 173 * 174 * Retrieve information about a device region. Caller provides 175 * struct vfio_region_info with index value set. Caller sets argsz. 176 * Implementation of region mapping is bus driver specific. This is 177 * intended to describe MMIO, I/O port, as well as bus specific 178 * regions (ex. PCI config space). Zero sized regions may be used 179 * to describe unimplemented regions (ex. unimplemented PCI BARs). 180 * Return: 0 on success, -errno on failure. 181 */ 182 struct vfio_region_info { 183 __u32 argsz; 184 __u32 flags; 185 #define VFIO_REGION_INFO_FLAG_READ (1 << 0) /* Region supports read */ 186 #define VFIO_REGION_INFO_FLAG_WRITE (1 << 1) /* Region supports write */ 187 #define VFIO_REGION_INFO_FLAG_MMAP (1 << 2) /* Region supports mmap */ 188 __u32 index; /* Region index */ 189 __u32 resv; /* Reserved for alignment */ 190 __u64 size; /* Region size (bytes) */ 191 __u64 offset; /* Region offset from start of device fd */ 192 }; 193 #define VFIO_DEVICE_GET_REGION_INFO _IO(VFIO_TYPE, VFIO_BASE + 8) 194 195 /** 196 * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9, 197 * struct vfio_irq_info) 198 * 199 * Retrieve information about a device IRQ. Caller provides 200 * struct vfio_irq_info with index value set. Caller sets argsz. 201 * Implementation of IRQ mapping is bus driver specific. Indexes 202 * using multiple IRQs are primarily intended to support MSI-like 203 * interrupt blocks. Zero count irq blocks may be used to describe 204 * unimplemented interrupt types. 205 * 206 * The EVENTFD flag indicates the interrupt index supports eventfd based 207 * signaling. 208 * 209 * The MASKABLE flags indicates the index supports MASK and UNMASK 210 * actions described below. 211 * 212 * AUTOMASKED indicates that after signaling, the interrupt line is 213 * automatically masked by VFIO and the user needs to unmask the line 214 * to receive new interrupts. This is primarily intended to distinguish 215 * level triggered interrupts. 216 * 217 * The NORESIZE flag indicates that the interrupt lines within the index 218 * are setup as a set and new subindexes cannot be enabled without first 219 * disabling the entire index. This is used for interrupts like PCI MSI 220 * and MSI-X where the driver may only use a subset of the available 221 * indexes, but VFIO needs to enable a specific number of vectors 222 * upfront. In the case of MSI-X, where the user can enable MSI-X and 223 * then add and unmask vectors, it's up to userspace to make the decision 224 * whether to allocate the maximum supported number of vectors or tear 225 * down setup and incrementally increase the vectors as each is enabled. 226 */ 227 struct vfio_irq_info { 228 __u32 argsz; 229 __u32 flags; 230 #define VFIO_IRQ_INFO_EVENTFD (1 << 0) 231 #define VFIO_IRQ_INFO_MASKABLE (1 << 1) 232 #define VFIO_IRQ_INFO_AUTOMASKED (1 << 2) 233 #define VFIO_IRQ_INFO_NORESIZE (1 << 3) 234 __u32 index; /* IRQ index */ 235 __u32 count; /* Number of IRQs within this index */ 236 }; 237 #define VFIO_DEVICE_GET_IRQ_INFO _IO(VFIO_TYPE, VFIO_BASE + 9) 238 239 /** 240 * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set) 241 * 242 * Set signaling, masking, and unmasking of interrupts. Caller provides 243 * struct vfio_irq_set with all fields set. 'start' and 'count' indicate 244 * the range of subindexes being specified. 245 * 246 * The DATA flags specify the type of data provided. If DATA_NONE, the 247 * operation performs the specified action immediately on the specified 248 * interrupt(s). For example, to unmask AUTOMASKED interrupt [0,0]: 249 * flags = (DATA_NONE|ACTION_UNMASK), index = 0, start = 0, count = 1. 250 * 251 * DATA_BOOL allows sparse support for the same on arrays of interrupts. 252 * For example, to mask interrupts [0,1] and [0,3] (but not [0,2]): 253 * flags = (DATA_BOOL|ACTION_MASK), index = 0, start = 1, count = 3, 254 * data = {1,0,1} 255 * 256 * DATA_EVENTFD binds the specified ACTION to the provided __s32 eventfd. 257 * A value of -1 can be used to either de-assign interrupts if already 258 * assigned or skip un-assigned interrupts. For example, to set an eventfd 259 * to be trigger for interrupts [0,0] and [0,2]: 260 * flags = (DATA_EVENTFD|ACTION_TRIGGER), index = 0, start = 0, count = 3, 261 * data = {fd1, -1, fd2} 262 * If index [0,1] is previously set, two count = 1 ioctls calls would be 263 * required to set [0,0] and [0,2] without changing [0,1]. 264 * 265 * Once a signaling mechanism is set, DATA_BOOL or DATA_NONE can be used 266 * with ACTION_TRIGGER to perform kernel level interrupt loopback testing 267 * from userspace (ie. simulate hardware triggering). 268 * 269 * Setting of an event triggering mechanism to userspace for ACTION_TRIGGER 270 * enables the interrupt index for the device. Individual subindex interrupts 271 * can be disabled using the -1 value for DATA_EVENTFD or the index can be 272 * disabled as a whole with: flags = (DATA_NONE|ACTION_TRIGGER), count = 0. 273 * 274 * Note that ACTION_[UN]MASK specify user->kernel signaling (irqfds) while 275 * ACTION_TRIGGER specifies kernel->user signaling. 276 */ 277 struct vfio_irq_set { 278 __u32 argsz; 279 __u32 flags; 280 #define VFIO_IRQ_SET_DATA_NONE (1 << 0) /* Data not present */ 281 #define VFIO_IRQ_SET_DATA_BOOL (1 << 1) /* Data is bool (u8) */ 282 #define VFIO_IRQ_SET_DATA_EVENTFD (1 << 2) /* Data is eventfd (s32) */ 283 #define VFIO_IRQ_SET_ACTION_MASK (1 << 3) /* Mask interrupt */ 284 #define VFIO_IRQ_SET_ACTION_UNMASK (1 << 4) /* Unmask interrupt */ 285 #define VFIO_IRQ_SET_ACTION_TRIGGER (1 << 5) /* Trigger interrupt */ 286 __u32 index; 287 __u32 start; 288 __u32 count; 289 __u8 data[]; 290 }; 291 #define VFIO_DEVICE_SET_IRQS _IO(VFIO_TYPE, VFIO_BASE + 10) 292 293 #define VFIO_IRQ_SET_DATA_TYPE_MASK (VFIO_IRQ_SET_DATA_NONE | \ 294 VFIO_IRQ_SET_DATA_BOOL | \ 295 VFIO_IRQ_SET_DATA_EVENTFD) 296 #define VFIO_IRQ_SET_ACTION_TYPE_MASK (VFIO_IRQ_SET_ACTION_MASK | \ 297 VFIO_IRQ_SET_ACTION_UNMASK | \ 298 VFIO_IRQ_SET_ACTION_TRIGGER) 299 /** 300 * VFIO_DEVICE_RESET - _IO(VFIO_TYPE, VFIO_BASE + 11) 301 * 302 * Reset a device. 303 */ 304 #define VFIO_DEVICE_RESET _IO(VFIO_TYPE, VFIO_BASE + 11) 305 306 /* 307 * The VFIO-PCI bus driver makes use of the following fixed region and 308 * IRQ index mapping. Unimplemented regions return a size of zero. 309 * Unimplemented IRQ types return a count of zero. 310 */ 311 312 enum { 313 VFIO_PCI_BAR0_REGION_INDEX, 314 VFIO_PCI_BAR1_REGION_INDEX, 315 VFIO_PCI_BAR2_REGION_INDEX, 316 VFIO_PCI_BAR3_REGION_INDEX, 317 VFIO_PCI_BAR4_REGION_INDEX, 318 VFIO_PCI_BAR5_REGION_INDEX, 319 VFIO_PCI_ROM_REGION_INDEX, 320 VFIO_PCI_CONFIG_REGION_INDEX, 321 /* 322 * Expose VGA regions defined for PCI base class 03, subclass 00. 323 * This includes I/O port ranges 0x3b0 to 0x3bb and 0x3c0 to 0x3df 324 * as well as the MMIO range 0xa0000 to 0xbffff. Each implemented 325 * range is found at it's identity mapped offset from the region 326 * offset, for example 0x3b0 is region_info.offset + 0x3b0. Areas 327 * between described ranges are unimplemented. 328 */ 329 VFIO_PCI_VGA_REGION_INDEX, 330 VFIO_PCI_NUM_REGIONS 331 }; 332 333 enum { 334 VFIO_PCI_INTX_IRQ_INDEX, 335 VFIO_PCI_MSI_IRQ_INDEX, 336 VFIO_PCI_MSIX_IRQ_INDEX, 337 VFIO_PCI_ERR_IRQ_INDEX, 338 VFIO_PCI_REQ_IRQ_INDEX, 339 VFIO_PCI_NUM_IRQS 340 }; 341 342 /** 343 * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IORW(VFIO_TYPE, VFIO_BASE + 12, 344 * struct vfio_pci_hot_reset_info) 345 * 346 * Return: 0 on success, -errno on failure: 347 * -enospc = insufficient buffer, -enodev = unsupported for device. 348 */ 349 struct vfio_pci_dependent_device { 350 __u32 group_id; 351 __u16 segment; 352 __u8 bus; 353 __u8 devfn; /* Use PCI_SLOT/PCI_FUNC */ 354 }; 355 356 struct vfio_pci_hot_reset_info { 357 __u32 argsz; 358 __u32 flags; 359 __u32 count; 360 struct vfio_pci_dependent_device devices[]; 361 }; 362 363 #define VFIO_DEVICE_GET_PCI_HOT_RESET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12) 364 365 /** 366 * VFIO_DEVICE_PCI_HOT_RESET - _IOW(VFIO_TYPE, VFIO_BASE + 13, 367 * struct vfio_pci_hot_reset) 368 * 369 * Return: 0 on success, -errno on failure. 370 */ 371 struct vfio_pci_hot_reset { 372 __u32 argsz; 373 __u32 flags; 374 __u32 count; 375 __s32 group_fds[]; 376 }; 377 378 #define VFIO_DEVICE_PCI_HOT_RESET _IO(VFIO_TYPE, VFIO_BASE + 13) 379 380 /* -------- API for Type1 VFIO IOMMU -------- */ 381 382 /** 383 * VFIO_IOMMU_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 12, struct vfio_iommu_info) 384 * 385 * Retrieve information about the IOMMU object. Fills in provided 386 * struct vfio_iommu_info. Caller sets argsz. 387 * 388 * XXX Should we do these by CHECK_EXTENSION too? 389 */ 390 struct vfio_iommu_type1_info { 391 __u32 argsz; 392 __u32 flags; 393 #define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */ 394 __u64 iova_pgsizes; /* Bitmap of supported page sizes */ 395 }; 396 397 #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12) 398 399 /** 400 * VFIO_IOMMU_MAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 13, struct vfio_dma_map) 401 * 402 * Map process virtual addresses to IO virtual addresses using the 403 * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required. 404 */ 405 struct vfio_iommu_type1_dma_map { 406 __u32 argsz; 407 __u32 flags; 408 #define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */ 409 #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */ 410 __u64 vaddr; /* Process virtual address */ 411 __u64 iova; /* IO virtual address */ 412 __u64 size; /* Size of mapping (bytes) */ 413 }; 414 415 #define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13) 416 417 /** 418 * VFIO_IOMMU_UNMAP_DMA - _IOWR(VFIO_TYPE, VFIO_BASE + 14, 419 * struct vfio_dma_unmap) 420 * 421 * Unmap IO virtual addresses using the provided struct vfio_dma_unmap. 422 * Caller sets argsz. The actual unmapped size is returned in the size 423 * field. No guarantee is made to the user that arbitrary unmaps of iova 424 * or size different from those used in the original mapping call will 425 * succeed. 426 */ 427 struct vfio_iommu_type1_dma_unmap { 428 __u32 argsz; 429 __u32 flags; 430 __u64 iova; /* IO virtual address */ 431 __u64 size; /* Size of mapping (bytes) */ 432 }; 433 434 #define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14) 435 436 /* 437 * IOCTLs to enable/disable IOMMU container usage. 438 * No parameters are supported. 439 */ 440 #define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15) 441 #define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16) 442 443 /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */ 444 445 /* 446 * The SPAPR TCE info struct provides the information about the PCI bus 447 * address ranges available for DMA, these values are programmed into 448 * the hardware so the guest has to know that information. 449 * 450 * The DMA 32 bit window start is an absolute PCI bus address. 451 * The IOVA address passed via map/unmap ioctls are absolute PCI bus 452 * addresses too so the window works as a filter rather than an offset 453 * for IOVA addresses. 454 * 455 * A flag will need to be added if other page sizes are supported, 456 * so as defined here, it is always 4k. 457 */ 458 struct vfio_iommu_spapr_tce_info { 459 __u32 argsz; 460 __u32 flags; /* reserved for future use */ 461 __u32 dma32_window_start; /* 32 bit window start (bytes) */ 462 __u32 dma32_window_size; /* 32 bit window size (bytes) */ 463 }; 464 465 #define VFIO_IOMMU_SPAPR_TCE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12) 466 467 /* 468 * EEH PE operation struct provides ways to: 469 * - enable/disable EEH functionality; 470 * - unfreeze IO/DMA for frozen PE; 471 * - read PE state; 472 * - reset PE; 473 * - configure PE. 474 */ 475 struct vfio_eeh_pe_op { 476 __u32 argsz; 477 __u32 flags; 478 __u32 op; 479 }; 480 481 #define VFIO_EEH_PE_DISABLE 0 /* Disable EEH functionality */ 482 #define VFIO_EEH_PE_ENABLE 1 /* Enable EEH functionality */ 483 #define VFIO_EEH_PE_UNFREEZE_IO 2 /* Enable IO for frozen PE */ 484 #define VFIO_EEH_PE_UNFREEZE_DMA 3 /* Enable DMA for frozen PE */ 485 #define VFIO_EEH_PE_GET_STATE 4 /* PE state retrieval */ 486 #define VFIO_EEH_PE_STATE_NORMAL 0 /* PE in functional state */ 487 #define VFIO_EEH_PE_STATE_RESET 1 /* PE reset in progress */ 488 #define VFIO_EEH_PE_STATE_STOPPED 2 /* Stopped DMA and IO */ 489 #define VFIO_EEH_PE_STATE_STOPPED_DMA 4 /* Stopped DMA only */ 490 #define VFIO_EEH_PE_STATE_UNAVAIL 5 /* State unavailable */ 491 #define VFIO_EEH_PE_RESET_DEACTIVATE 5 /* Deassert PE reset */ 492 #define VFIO_EEH_PE_RESET_HOT 6 /* Assert hot reset */ 493 #define VFIO_EEH_PE_RESET_FUNDAMENTAL 7 /* Assert fundamental reset */ 494 #define VFIO_EEH_PE_CONFIGURE 8 /* PE configuration */ 495 496 #define VFIO_EEH_PE_OP _IO(VFIO_TYPE, VFIO_BASE + 21) 497 498 /* ***************************************************************** */ 499 500 #endif /* VFIO_H */ 501