linux-headers/linux/vfio.h

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