hw/vfio/platform.c

   1 /*
   2  * vfio based device assignment support - platform devices
   3  *
   4  * Copyright Linaro Limited, 2014
   5  *
   6  * Authors:
   7  *  Kim Phillips <kim.phillips@linaro.org>
   8  *  Eric Auger <eric.auger@linaro.org>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  * Based on vfio based PCI device assignment support:
  14  *  Copyright Red Hat, Inc. 2012
  15  */
  16
  17 #include "qemu/osdep.h"
  18 #include "qapi/error.h"
  19 #include <sys/ioctl.h>
  20 #include <linux/vfio.h>
  21
  22 #include "hw/vfio/vfio-platform.h"
  23 #include "migration/vmstate.h"
  24 #include "qemu/error-report.h"
  25 #include "qemu/lockable.h"
  26 #include "qemu/main-loop.h"
  27 #include "qemu/module.h"
  28 #include "qemu/range.h"
  29 #include "exec/memory.h"
  30 #include "exec/address-spaces.h"
  31 #include "qemu/queue.h"
  32 #include "hw/sysbus.h"
  33 #include "trace.h"
  34 #include "hw/irq.h"
  35 #include "hw/platform-bus.h"
  36 #include "hw/qdev-properties.h"
  37 #include "sysemu/kvm.h"
  38
  39 /*
  40  * Functions used whatever the injection method
  41  */
  42
  43 static inline bool vfio_irq_is_automasked(VFIOINTp *intp)
  44 {
  45     return intp->flags & VFIO_IRQ_INFO_AUTOMASKED;
  46 }
  47
  48 /**
  49  * vfio_init_intp - allocate, initialize the IRQ struct pointer
  50  * and add it into the list of IRQs
  51  * @vbasedev: the VFIO device handle
  52  * @info: irq info struct retrieved from VFIO driver
  53  * @errp: error object
  54  */
  55 static VFIOINTp *vfio_init_intp(VFIODevice *vbasedev,
  56                                 struct vfio_irq_info info, Error **errp)
  57 {
  58     int ret;
  59     VFIOPlatformDevice *vdev =
  60         container_of(vbasedev, VFIOPlatformDevice, vbasedev);
  61     SysBusDevice *sbdev = SYS_BUS_DEVICE(vdev);
  62     VFIOINTp *intp;
  63
  64     intp = g_malloc0(sizeof(*intp));
  65     intp->vdev = vdev;
  66     intp->pin = info.index;
  67     intp->flags = info.flags;
  68     intp->state = VFIO_IRQ_INACTIVE;
  69     intp->kvm_accel = false;
  70
  71     sysbus_init_irq(sbdev, &intp->qemuirq);
  72
  73     /* Get an eventfd for trigger */
  74     intp->interrupt = g_malloc0(sizeof(EventNotifier));
  75     ret = event_notifier_init(intp->interrupt, 0);
  76     if (ret) {
  77         g_free(intp->interrupt);
  78         g_free(intp);
  79         error_setg_errno(errp, -ret,
  80                          "failed to initialize trigger eventfd notifier");
  81         return NULL;
  82     }
  83     if (vfio_irq_is_automasked(intp)) {
  84         /* Get an eventfd for resample/unmask */
  85         intp->unmask = g_malloc0(sizeof(EventNotifier));
  86         ret = event_notifier_init(intp->unmask, 0);
  87         if (ret) {
  88             g_free(intp->interrupt);
  89             g_free(intp->unmask);
  90             g_free(intp);
  91             error_setg_errno(errp, -ret,
  92                              "failed to initialize resample eventfd notifier");
  93             return NULL;
  94         }
  95     }
  96
  97     QLIST_INSERT_HEAD(&vdev->intp_list, intp, next);
  98     return intp;
  99 }
 100
 101 /**
 102  * vfio_set_trigger_eventfd - set VFIO eventfd handling
 103  *
 104  * @intp: IRQ struct handle
 105  * @handler: handler to be called on eventfd signaling
 106  *
 107  * Setup VFIO signaling and attach an optional user-side handler
 108  * to the eventfd
 109  */
 110 static int vfio_set_trigger_eventfd(VFIOINTp *intp,
 111                                     eventfd_user_side_handler_t handler)
 112 {
 113     VFIODevice *vbasedev = &intp->vdev->vbasedev;
 114     int32_t fd = event_notifier_get_fd(intp->interrupt);
 115     Error *err = NULL;
 116     int ret;
 117
 118     qemu_set_fd_handler(fd, (IOHandler *)handler, NULL, intp);
 119
 120     ret = vfio_set_irq_signaling(vbasedev, intp->pin, 0,
 121                                  VFIO_IRQ_SET_ACTION_TRIGGER, fd, &err);
 122     if (ret) {
 123         error_reportf_err(err, VFIO_MSG_PREFIX, vbasedev->name);
 124         qemu_set_fd_handler(fd, NULL, NULL, NULL);
 125     }
 126
 127     return ret;
 128 }
 129
 130 /*
 131  * Functions only used when eventfds are handled on user-side
 132  * ie. without irqfd
 133  */
 134
 135 /**
 136  * vfio_mmap_set_enabled - enable/disable the fast path mode
 137  * @vdev: the VFIO platform device
 138  * @enabled: the target mmap state
 139  *
 140  * enabled = true ~ fast path = MMIO region is mmaped (no KVM TRAP);
 141  * enabled = false ~ slow path = MMIO region is trapped and region callbacks
 142  * are called; slow path enables to trap the device IRQ status register reset
 143 */
 144
 145 static void vfio_mmap_set_enabled(VFIOPlatformDevice *vdev, bool enabled)
 146 {
 147     int i;
 148
 149     for (i = 0; i < vdev->vbasedev.num_regions; i++) {
 150         vfio_region_mmaps_set_enabled(vdev->regions[i], enabled);
 151     }
 152 }
 153
 154 /**
 155  * vfio_intp_mmap_enable - timer function, restores the fast path
 156  * if there is no more active IRQ
 157  * @opaque: actually points to the VFIO platform device
 158  *
 159  * Called on mmap timer timout, this function checks whether the
 160  * IRQ is still active and if not, restores the fast path.
 161  * by construction a single eventfd is handled at a time.
 162  * if the IRQ is still active, the timer is re-programmed.
 163  */
 164 static void vfio_intp_mmap_enable(void *opaque)
 165 {
 166     VFIOINTp *tmp;
 167     VFIOPlatformDevice *vdev = (VFIOPlatformDevice *)opaque;
 168
 169     qemu_mutex_lock(&vdev->intp_mutex);
 170     QLIST_FOREACH(tmp, &vdev->intp_list, next) {
 171         if (tmp->state == VFIO_IRQ_ACTIVE) {
 172             trace_vfio_platform_intp_mmap_enable(tmp->pin);
 173             /* re-program the timer to check active status later */
 174             timer_mod(vdev->mmap_timer,
 175                       qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
 176                           vdev->mmap_timeout);
 177             qemu_mutex_unlock(&vdev->intp_mutex);
 178             return;
 179         }
 180     }
 181     vfio_mmap_set_enabled(vdev, true);
 182     qemu_mutex_unlock(&vdev->intp_mutex);
 183 }
 184
 185 /**
 186  * vfio_intp_inject_pending_lockheld - Injects a pending IRQ
 187  * @opaque: opaque pointer, in practice the VFIOINTp handle
 188  *
 189  * The function is called on a previous IRQ completion, from
 190  * vfio_platform_eoi, while the intp_mutex is locked.
 191  * Also in such situation, the slow path already is set and
 192  * the mmap timer was already programmed.
 193  */
 194 static void vfio_intp_inject_pending_lockheld(VFIOINTp *intp)
 195 {
 196     trace_vfio_platform_intp_inject_pending_lockheld(intp->pin,
 197                               event_notifier_get_fd(intp->interrupt));
 198
 199     intp->state = VFIO_IRQ_ACTIVE;
 200
 201     /* trigger the virtual IRQ */
 202     qemu_set_irq(intp->qemuirq, 1);
 203 }
 204
 205 /**
 206  * vfio_intp_interrupt - The user-side eventfd handler
 207  * @opaque: opaque pointer which in practice is the VFIOINTp handle
 208  *
 209  * the function is entered in event handler context:
 210  * the vIRQ is injected into the guest if there is no other active
 211  * or pending IRQ.
 212  */
 213 static void vfio_intp_interrupt(VFIOINTp *intp)
 214 {
 215     int ret;
 216     VFIOINTp *tmp;
 217     VFIOPlatformDevice *vdev = intp->vdev;
 218     bool delay_handling = false;
 219
 220     QEMU_LOCK_GUARD(&vdev->intp_mutex);
 221     if (intp->state == VFIO_IRQ_INACTIVE) {
 222         QLIST_FOREACH(tmp, &vdev->intp_list, next) {
 223             if (tmp->state == VFIO_IRQ_ACTIVE ||
 224                 tmp->state == VFIO_IRQ_PENDING) {
 225                 delay_handling = true;
 226                 break;
 227             }
 228         }
 229     }
 230     if (delay_handling) {
 231         /*
 232          * the new IRQ gets a pending status and is pushed in
 233          * the pending queue
 234          */
 235         intp->state = VFIO_IRQ_PENDING;
 236         trace_vfio_intp_interrupt_set_pending(intp->pin);
 237         QSIMPLEQ_INSERT_TAIL(&vdev->pending_intp_queue,
 238                              intp, pqnext);
 239         ret = event_notifier_test_and_clear(intp->interrupt);
 240         return;
 241     }
 242
 243     trace_vfio_platform_intp_interrupt(intp->pin,
 244                               event_notifier_get_fd(intp->interrupt));
 245
 246     ret = event_notifier_test_and_clear(intp->interrupt);
 247     if (!ret) {
 248         error_report("Error when clearing fd=%d (ret = %d)",
 249                      event_notifier_get_fd(intp->interrupt), ret);
 250     }
 251
 252     intp->state = VFIO_IRQ_ACTIVE;
 253
 254     /* sets slow path */
 255     vfio_mmap_set_enabled(vdev, false);
 256
 257     /* trigger the virtual IRQ */
 258     qemu_set_irq(intp->qemuirq, 1);
 259
 260     /*
 261      * Schedule the mmap timer which will restore fastpath when no IRQ
 262      * is active anymore
 263      */
 264     if (vdev->mmap_timeout) {
 265         timer_mod(vdev->mmap_timer,
 266                   qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
 267                       vdev->mmap_timeout);
 268     }
 269 }
 270
 271 /**
 272  * vfio_platform_eoi - IRQ completion routine
 273  * @vbasedev: the VFIO device handle
 274  *
 275  * De-asserts the active virtual IRQ and unmasks the physical IRQ
 276  * (effective for level sensitive IRQ auto-masked by the  VFIO driver).
 277  * Then it handles next pending IRQ if any.
 278  * eoi function is called on the first access to any MMIO region
 279  * after an IRQ was triggered, trapped since slow path was set.
 280  * It is assumed this access corresponds to the IRQ status
 281  * register reset. With such a mechanism, a single IRQ can be
 282  * handled at a time since there is no way to know which IRQ
 283  * was completed by the guest (we would need additional details
 284  * about the IRQ status register mask).
 285  */
 286 static void vfio_platform_eoi(VFIODevice *vbasedev)
 287 {
 288     VFIOINTp *intp;
 289     VFIOPlatformDevice *vdev =
 290         container_of(vbasedev, VFIOPlatformDevice, vbasedev);
 291
 292     qemu_mutex_lock(&vdev->intp_mutex);
 293     QLIST_FOREACH(intp, &vdev->intp_list, next) {
 294         if (intp->state == VFIO_IRQ_ACTIVE) {
 295             trace_vfio_platform_eoi(intp->pin,
 296                                 event_notifier_get_fd(intp->interrupt));
 297             intp->state = VFIO_IRQ_INACTIVE;
 298
 299             /* deassert the virtual IRQ */
 300             qemu_set_irq(intp->qemuirq, 0);
 301
 302             if (vfio_irq_is_automasked(intp)) {
 303                 /* unmasks the physical level-sensitive IRQ */
 304                 vfio_unmask_single_irqindex(vbasedev, intp->pin);
 305             }
 306
 307             /* a single IRQ can be active at a time */
 308             break;
 309         }
 310     }
 311     /* in case there are pending IRQs, handle the first one */
 312     if (!QSIMPLEQ_EMPTY(&vdev->pending_intp_queue)) {
 313         intp = QSIMPLEQ_FIRST(&vdev->pending_intp_queue);
 314         vfio_intp_inject_pending_lockheld(intp);
 315         QSIMPLEQ_REMOVE_HEAD(&vdev->pending_intp_queue, pqnext);
 316     }
 317     qemu_mutex_unlock(&vdev->intp_mutex);
 318 }
 319
 320 /**
 321  * vfio_start_eventfd_injection - starts the virtual IRQ injection using
 322  * user-side handled eventfds
 323  * @sbdev: the sysbus device handle
 324  * @irq: the qemu irq handle
 325  */
 326
 327 static void vfio_start_eventfd_injection(SysBusDevice *sbdev, qemu_irq irq)
 328 {
 329     VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
 330     VFIOINTp *intp;
 331
 332     QLIST_FOREACH(intp, &vdev->intp_list, next) {
 333         if (intp->qemuirq == irq) {
 334             break;
 335         }
 336     }
 337     assert(intp);
 338
 339     if (vfio_set_trigger_eventfd(intp, vfio_intp_interrupt)) {
 340         abort();
 341     }
 342 }
 343
 344 /*
 345  * Functions used for irqfd
 346  */
 347
 348 /**
 349  * vfio_set_resample_eventfd - sets the resamplefd for an IRQ
 350  * @intp: the IRQ struct handle
 351  * programs the VFIO driver to unmask this IRQ when the
 352  * intp->unmask eventfd is triggered
 353  */
 354 static int vfio_set_resample_eventfd(VFIOINTp *intp)
 355 {
 356     int32_t fd = event_notifier_get_fd(intp->unmask);
 357     VFIODevice *vbasedev = &intp->vdev->vbasedev;
 358     Error *err = NULL;
 359     int ret;
 360
 361     qemu_set_fd_handler(fd, NULL, NULL, NULL);
 362     ret = vfio_set_irq_signaling(vbasedev, intp->pin, 0,
 363                                  VFIO_IRQ_SET_ACTION_UNMASK, fd, &err);
 364     if (ret) {
 365         error_reportf_err(err, VFIO_MSG_PREFIX, vbasedev->name);
 366     }
 367     return ret;
 368 }
 369
 370 /**
 371  * vfio_start_irqfd_injection - starts the virtual IRQ injection using
 372  * irqfd
 373  *
 374  * @sbdev: the sysbus device handle
 375  * @irq: the qemu irq handle
 376  *
 377  * In case the irqfd setup fails, we fallback to userspace handled eventfd
 378  */
 379 static void vfio_start_irqfd_injection(SysBusDevice *sbdev, qemu_irq irq)
 380 {
 381     VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
 382     VFIOINTp *intp;
 383
 384     if (!kvm_irqfds_enabled() || !kvm_resamplefds_enabled() ||
 385         !vdev->irqfd_allowed) {
 386         goto fail_irqfd;
 387     }
 388
 389     QLIST_FOREACH(intp, &vdev->intp_list, next) {
 390         if (intp->qemuirq == irq) {
 391             break;
 392         }
 393     }
 394     assert(intp);
 395
 396     if (kvm_irqchip_add_irqfd_notifier(kvm_state, intp->interrupt,
 397                                    intp->unmask, irq) < 0) {
 398         goto fail_irqfd;
 399     }
 400
 401     if (vfio_set_trigger_eventfd(intp, NULL) < 0) {
 402         goto fail_vfio;
 403     }
 404     if (vfio_irq_is_automasked(intp)) {
 405         if (vfio_set_resample_eventfd(intp) < 0) {
 406             goto fail_vfio;
 407         }
 408         trace_vfio_platform_start_level_irqfd_injection(intp->pin,
 409                                     event_notifier_get_fd(intp->interrupt),
 410                                     event_notifier_get_fd(intp->unmask));
 411     } else {
 412         trace_vfio_platform_start_edge_irqfd_injection(intp->pin,
 413                                     event_notifier_get_fd(intp->interrupt));
 414     }
 415
 416     intp->kvm_accel = true;
 417
 418     return;
 419 fail_vfio:
 420     kvm_irqchip_remove_irqfd_notifier(kvm_state, intp->interrupt, irq);
 421     abort();
 422 fail_irqfd:
 423     vfio_start_eventfd_injection(sbdev, irq);
 424     return;
 425 }
 426
 427 /* VFIO skeleton */
 428
 429 static void vfio_platform_compute_needs_reset(VFIODevice *vbasedev)
 430 {
 431     vbasedev->needs_reset = true;
 432 }
 433
 434 /* not implemented yet */
 435 static int vfio_platform_hot_reset_multi(VFIODevice *vbasedev)
 436 {
 437     return -1;
 438 }
 439
 440 /**
 441  * vfio_populate_device - Allocate and populate MMIO region
 442  * and IRQ structs according to driver returned information
 443  * @vbasedev: the VFIO device handle
 444  * @errp: error object
 445  *
 446  */
 447 static int vfio_populate_device(VFIODevice *vbasedev, Error **errp)
 448 {
 449     VFIOINTp *intp, *tmp;
 450     int i, ret = -1;
 451     VFIOPlatformDevice *vdev =
 452         container_of(vbasedev, VFIOPlatformDevice, vbasedev);
 453
 454     if (!(vbasedev->flags & VFIO_DEVICE_FLAGS_PLATFORM)) {
 455         error_setg(errp, "this isn't a platform device");
 456         return ret;
 457     }
 458
 459     vdev->regions = g_new0(VFIORegion *, vbasedev->num_regions);
 460
 461     for (i = 0; i < vbasedev->num_regions; i++) {
 462         char *name = g_strdup_printf("VFIO %s region %d\n", vbasedev->name, i);
 463
 464         vdev->regions[i] = g_new0(VFIORegion, 1);
 465         ret = vfio_region_setup(OBJECT(vdev), vbasedev,
 466                                 vdev->regions[i], i, name);
 467         g_free(name);
 468         if (ret) {
 469             error_setg_errno(errp, -ret, "failed to get region %d info", i);
 470             goto reg_error;
 471         }
 472     }
 473
 474     vdev->mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
 475                                     vfio_intp_mmap_enable, vdev);
 476
 477     QSIMPLEQ_INIT(&vdev->pending_intp_queue);
 478
 479     for (i = 0; i < vbasedev->num_irqs; i++) {
 480         struct vfio_irq_info irq = { .argsz = sizeof(irq) };
 481
 482         irq.index = i;
 483         ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq);
 484         if (ret) {
 485             error_setg_errno(errp, -ret, "failed to get device irq info");
 486             goto irq_err;
 487         } else {
 488             trace_vfio_platform_populate_interrupts(irq.index,
 489                                                     irq.count,
 490                                                     irq.flags);
 491             intp = vfio_init_intp(vbasedev, irq, errp);
 492             if (!intp) {
 493                 ret = -1;
 494                 goto irq_err;
 495             }
 496         }
 497     }
 498     return 0;
 499 irq_err:
 500     timer_del(vdev->mmap_timer);
 501     QLIST_FOREACH_SAFE(intp, &vdev->intp_list, next, tmp) {
 502         QLIST_REMOVE(intp, next);
 503         g_free(intp);
 504     }
 505 reg_error:
 506     for (i = 0; i < vbasedev->num_regions; i++) {
 507         if (vdev->regions[i]) {
 508             vfio_region_finalize(vdev->regions[i]);
 509         }
 510         g_free(vdev->regions[i]);
 511     }
 512     g_free(vdev->regions);
 513     return ret;
 514 }
 515
 516 /* specialized functions for VFIO Platform devices */
 517 static VFIODeviceOps vfio_platform_ops = {
 518     .vfio_compute_needs_reset = vfio_platform_compute_needs_reset,
 519     .vfio_hot_reset_multi = vfio_platform_hot_reset_multi,
 520     .vfio_eoi = vfio_platform_eoi,
 521 };
 522
 523 /**
 524  * vfio_base_device_init - perform preliminary VFIO setup
 525  * @vbasedev: the VFIO device handle
 526  * @errp: error object
 527  *
 528  * Implement the VFIO command sequence that allows to discover
 529  * assigned device resources: group extraction, device
 530  * fd retrieval, resource query.
 531  * Precondition: the device name must be initialized
 532  */
 533 static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
 534 {
 535     VFIOGroup *group;
 536     VFIODevice *vbasedev_iter;
 537     char *tmp, group_path[PATH_MAX], *group_name;
 538     ssize_t len;
 539     struct stat st;
 540     int groupid;
 541     int ret;
 542
 543     /* @sysfsdev takes precedence over @host */
 544     if (vbasedev->sysfsdev) {
 545         g_free(vbasedev->name);
 546         vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
 547     } else {
 548         if (!vbasedev->name || strchr(vbasedev->name, '/')) {
 549             error_setg(errp, "wrong host device name");
 550             return -EINVAL;
 551         }
 552
 553         vbasedev->sysfsdev = g_strdup_printf("/sys/bus/platform/devices/%s",
 554                                              vbasedev->name);
 555     }
 556
 557     if (stat(vbasedev->sysfsdev, &st) < 0) {
 558         error_setg_errno(errp, errno,
 559                          "failed to get the sysfs host device file status");
 560         return -errno;
 561     }
 562
 563     tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev);
 564     len = readlink(tmp, group_path, sizeof(group_path));
 565     g_free(tmp);
 566
 567     if (len < 0 || len >= sizeof(group_path)) {
 568         ret = len < 0 ? -errno : -ENAMETOOLONG;
 569         error_setg_errno(errp, -ret, "no iommu_group found");
 570         return ret;
 571     }
 572
 573     group_path[len] = 0;
 574
 575     group_name = basename(group_path);
 576     if (sscanf(group_name, "%d", &groupid) != 1) {
 577         error_setg_errno(errp, errno, "failed to read %s", group_path);
 578         return -errno;
 579     }
 580
 581     trace_vfio_platform_base_device_init(vbasedev->name, groupid);
 582
 583     group = vfio_get_group(groupid, &address_space_memory, errp);
 584     if (!group) {
 585         return -ENOENT;
 586     }
 587
 588     QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
 589         if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
 590             error_setg(errp, "device is already attached");
 591             vfio_put_group(group);
 592             return -EBUSY;
 593         }
 594     }
 595     ret = vfio_get_device(group, vbasedev->name, vbasedev, errp);
 596     if (ret) {
 597         vfio_put_group(group);
 598         return ret;
 599     }
 600
 601     ret = vfio_populate_device(vbasedev, errp);
 602     if (ret) {
 603         vfio_put_group(group);
 604     }
 605
 606     return ret;
 607 }
 608
 609 /**
 610  * vfio_platform_realize  - the device realize function
 611  * @dev: device state pointer
 612  * @errp: error
 613  *
 614  * initialize the device, its memory regions and IRQ structures
 615  * IRQ are started separately
 616  */
 617 static void vfio_platform_realize(DeviceState *dev, Error **errp)
 618 {
 619     VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(dev);
 620     SysBusDevice *sbdev = SYS_BUS_DEVICE(dev);
 621     VFIODevice *vbasedev = &vdev->vbasedev;
 622     int i, ret;
 623
 624     vbasedev->type = VFIO_DEVICE_TYPE_PLATFORM;
 625     vbasedev->dev = dev;
 626     vbasedev->ops = &vfio_platform_ops;
 627
 628     qemu_mutex_init(&vdev->intp_mutex);
 629
 630     trace_vfio_platform_realize(vbasedev->sysfsdev ?
 631                                 vbasedev->sysfsdev : vbasedev->name,
 632                                 vdev->compat);
 633
 634     ret = vfio_base_device_init(vbasedev, errp);
 635     if (ret) {
 636         goto out;
 637     }
 638
 639     if (!vdev->compat) {
 640         GError *gerr = NULL;
 641         gchar *contents;
 642         gsize length;
 643         char *path;
 644
 645         path = g_strdup_printf("%s/of_node/compatible", vbasedev->sysfsdev);
 646         if (!g_file_get_contents(path, &contents, &length, &gerr)) {
 647             error_setg(errp, "%s", gerr->message);
 648             g_error_free(gerr);
 649             g_free(path);
 650             return;
 651         }
 652         g_free(path);
 653         vdev->compat = contents;
 654         for (vdev->num_compat = 0; length; vdev->num_compat++) {
 655             size_t skip = strlen(contents) + 1;
 656             contents += skip;
 657             length -= skip;
 658         }
 659     }
 660
 661     for (i = 0; i < vbasedev->num_regions; i++) {
 662         if (vfio_region_mmap(vdev->regions[i])) {
 663             warn_report("%s mmap unsupported, performance may be slow",
 664                         memory_region_name(vdev->regions[i]->mem));
 665         }
 666         sysbus_init_mmio(sbdev, vdev->regions[i]->mem);
 667     }
 668 out:
 669     if (!ret) {
 670         return;
 671     }
 672
 673     if (vdev->vbasedev.name) {
 674         error_prepend(errp, VFIO_MSG_PREFIX, vdev->vbasedev.name);
 675     } else {
 676         error_prepend(errp, "vfio error: ");
 677     }
 678 }
 679
 680 static const VMStateDescription vfio_platform_vmstate = {
 681     .name = "vfio-platform",
 682     .unmigratable = 1,
 683 };
 684
 685 static Property vfio_platform_dev_properties[] = {
 686     DEFINE_PROP_STRING("host", VFIOPlatformDevice, vbasedev.name),
 687     DEFINE_PROP_STRING("sysfsdev", VFIOPlatformDevice, vbasedev.sysfsdev),
 688     DEFINE_PROP_BOOL("x-no-mmap", VFIOPlatformDevice, vbasedev.no_mmap, false),
 689     DEFINE_PROP_UINT32("mmap-timeout-ms", VFIOPlatformDevice,
 690                        mmap_timeout, 1100),
 691     DEFINE_PROP_BOOL("x-irqfd", VFIOPlatformDevice, irqfd_allowed, true),
 692     DEFINE_PROP_END_OF_LIST(),
 693 };
 694
 695 static void vfio_platform_class_init(ObjectClass *klass, void *data)
 696 {
 697     DeviceClass *dc = DEVICE_CLASS(klass);
 698     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
 699
 700     dc->realize = vfio_platform_realize;
 701     device_class_set_props(dc, vfio_platform_dev_properties);
 702     dc->vmsd = &vfio_platform_vmstate;
 703     dc->desc = "VFIO-based platform device assignment";
 704     sbc->connect_irq_notifier = vfio_start_irqfd_injection;
 705     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 706     /* Supported by TYPE_VIRT_MACHINE */
 707     dc->user_creatable = true;
 708 }
 709
 710 static const TypeInfo vfio_platform_dev_info = {
 711     .name = TYPE_VFIO_PLATFORM,
 712     .parent = TYPE_SYS_BUS_DEVICE,
 713     .instance_size = sizeof(VFIOPlatformDevice),
 714     .class_init = vfio_platform_class_init,
 715     .class_size = sizeof(VFIOPlatformDeviceClass),
 716 };
 717
 718 static void register_vfio_platform_dev_type(void)
 719 {
 720     type_register_static(&vfio_platform_dev_info);
 721 }
 722
 723 type_init(register_vfio_platform_dev_type)