hw/vfio/display.c

   1 /*
   2  * display support for mdev based vgpu devices
   3  *
   4  * Copyright Red Hat, Inc. 2017
   5  *
   6  * Authors:
   7  *    Gerd Hoffmann
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include <linux/vfio.h>
  15 #include <sys/ioctl.h>
  16
  17 #include "sysemu/sysemu.h"
  18 #include "hw/display/edid.h"
  19 #include "ui/console.h"
  20 #include "qapi/error.h"
  21 #include "pci.h"
  22 #include "trace.h"
  23
  24 #ifndef DRM_PLANE_TYPE_PRIMARY
  25 # define DRM_PLANE_TYPE_PRIMARY 1
  26 # define DRM_PLANE_TYPE_CURSOR  2
  27 #endif
  28
  29 #define pread_field(_fd, _reg, _ptr, _fld)                              \
  30     (sizeof(_ptr->_fld) !=                                              \
  31      pread(_fd, &(_ptr->_fld), sizeof(_ptr->_fld),                      \
  32            _reg->offset + offsetof(typeof(*_ptr), _fld)))
  33
  34 #define pwrite_field(_fd, _reg, _ptr, _fld)                             \
  35     (sizeof(_ptr->_fld) !=                                              \
  36      pwrite(_fd, &(_ptr->_fld), sizeof(_ptr->_fld),                     \
  37             _reg->offset + offsetof(typeof(*_ptr), _fld)))
  38
  39
  40 static void vfio_display_edid_link_up(void *opaque)
  41 {
  42     VFIOPCIDevice *vdev = opaque;
  43     VFIODisplay *dpy = vdev->dpy;
  44     int fd = vdev->vbasedev.fd;
  45
  46     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_UP;
  47     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
  48         goto err;
  49     }
  50     trace_vfio_display_edid_link_up();
  51     return;
  52
  53 err:
  54     trace_vfio_display_edid_write_error();
  55 }
  56
  57 static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
  58                                      int prefx, int prefy)
  59 {
  60     VFIODisplay *dpy = vdev->dpy;
  61     int fd = vdev->vbasedev.fd;
  62     qemu_edid_info edid = {
  63         .maxx  = dpy->edid_regs->max_xres,
  64         .maxy  = dpy->edid_regs->max_yres,
  65         .prefx = prefx ?: vdev->display_xres,
  66         .prefy = prefy ?: vdev->display_yres,
  67     };
  68
  69     timer_del(dpy->edid_link_timer);
  70     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN;
  71     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
  72         goto err;
  73     }
  74     trace_vfio_display_edid_link_down();
  75
  76     if (!enabled) {
  77         return;
  78     }
  79
  80     if (edid.maxx && edid.prefx > edid.maxx) {
  81         edid.prefx = edid.maxx;
  82     }
  83     if (edid.maxy && edid.prefy > edid.maxy) {
  84         edid.prefy = edid.maxy;
  85     }
  86     qemu_edid_generate(dpy->edid_blob,
  87                        dpy->edid_regs->edid_max_size,
  88                        &edid);
  89     trace_vfio_display_edid_update(edid.prefx, edid.prefy);
  90
  91     dpy->edid_regs->edid_size = qemu_edid_size(dpy->edid_blob);
  92     if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, edid_size)) {
  93         goto err;
  94     }
  95     if (pwrite(fd, dpy->edid_blob, dpy->edid_regs->edid_size,
  96                dpy->edid_info->offset + dpy->edid_regs->edid_offset)
  97         != dpy->edid_regs->edid_size) {
  98         goto err;
  99     }
 100
 101     timer_mod(dpy->edid_link_timer,
 102               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 100);
 103     return;
 104
 105 err:
 106     trace_vfio_display_edid_write_error();
 107     return;
 108 }
 109
 110 static int vfio_display_edid_ui_info(void *opaque, uint32_t idx,
 111                                      QemuUIInfo *info)
 112 {
 113     VFIOPCIDevice *vdev = opaque;
 114     VFIODisplay *dpy = vdev->dpy;
 115
 116     if (!dpy->edid_regs) {
 117         return 0;
 118     }
 119
 120     if (info->width && info->height) {
 121         vfio_display_edid_update(vdev, true, info->width, info->height);
 122     } else {
 123         vfio_display_edid_update(vdev, false, 0, 0);
 124     }
 125
 126     return 0;
 127 }
 128
 129 static void vfio_display_edid_init(VFIOPCIDevice *vdev)
 130 {
 131     VFIODisplay *dpy = vdev->dpy;
 132     int fd = vdev->vbasedev.fd;
 133     int ret;
 134
 135     ret = vfio_get_dev_region_info(&vdev->vbasedev,
 136                                    VFIO_REGION_TYPE_GFX,
 137                                    VFIO_REGION_SUBTYPE_GFX_EDID,
 138                                    &dpy->edid_info);
 139     if (ret) {
 140         return;
 141     }
 142
 143     trace_vfio_display_edid_available();
 144     dpy->edid_regs = g_new0(struct vfio_region_gfx_edid, 1);
 145     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_offset)) {
 146         goto err;
 147     }
 148     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_max_size)) {
 149         goto err;
 150     }
 151     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_xres)) {
 152         goto err;
 153     }
 154     if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_yres)) {
 155         goto err;
 156     }
 157
 158     dpy->edid_blob = g_malloc0(dpy->edid_regs->edid_max_size);
 159
 160     /* if xres + yres properties are unset use the maximum resolution */
 161     if (!vdev->display_xres) {
 162         vdev->display_xres = dpy->edid_regs->max_xres;
 163     }
 164     if (!vdev->display_yres) {
 165         vdev->display_yres = dpy->edid_regs->max_yres;
 166     }
 167
 168     dpy->edid_link_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
 169                                         vfio_display_edid_link_up, vdev);
 170
 171     vfio_display_edid_update(vdev, true, 0, 0);
 172     return;
 173
 174 err:
 175     trace_vfio_display_edid_write_error();
 176     g_free(dpy->edid_regs);
 177     dpy->edid_regs = NULL;
 178     return;
 179 }
 180
 181 static void vfio_display_edid_exit(VFIODisplay *dpy)
 182 {
 183     if (!dpy->edid_regs) {
 184         return;
 185     }
 186
 187     g_free(dpy->edid_regs);
 188     g_free(dpy->edid_blob);
 189     timer_del(dpy->edid_link_timer);
 190     timer_free(dpy->edid_link_timer);
 191 }
 192
 193 static void vfio_display_update_cursor(VFIODMABuf *dmabuf,
 194                                        struct vfio_device_gfx_plane_info *plane)
 195 {
 196     if (dmabuf->pos_x != plane->x_pos || dmabuf->pos_y != plane->y_pos) {
 197         dmabuf->pos_x      = plane->x_pos;
 198         dmabuf->pos_y      = plane->y_pos;
 199         dmabuf->pos_updates++;
 200     }
 201     if (dmabuf->hot_x != plane->x_hot || dmabuf->hot_y != plane->y_hot) {
 202         dmabuf->hot_x      = plane->x_hot;
 203         dmabuf->hot_y      = plane->y_hot;
 204         dmabuf->hot_updates++;
 205     }
 206 }
 207
 208 static VFIODMABuf *vfio_display_get_dmabuf(VFIOPCIDevice *vdev,
 209                                            uint32_t plane_type)
 210 {
 211     VFIODisplay *dpy = vdev->dpy;
 212     struct vfio_device_gfx_plane_info plane;
 213     VFIODMABuf *dmabuf;
 214     int fd, ret;
 215
 216     memset(&plane, 0, sizeof(plane));
 217     plane.argsz = sizeof(plane);
 218     plane.flags = VFIO_GFX_PLANE_TYPE_DMABUF;
 219     plane.drm_plane_type = plane_type;
 220     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
 221     if (ret < 0) {
 222         return NULL;
 223     }
 224     if (!plane.drm_format || !plane.size) {
 225         return NULL;
 226     }
 227
 228     QTAILQ_FOREACH(dmabuf, &dpy->dmabuf.bufs, next) {
 229         if (dmabuf->dmabuf_id == plane.dmabuf_id) {
 230             /* found in list, move to head, return it */
 231             QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
 232             QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
 233             if (plane_type == DRM_PLANE_TYPE_CURSOR) {
 234                 vfio_display_update_cursor(dmabuf, &plane);
 235             }
 236             return dmabuf;
 237         }
 238     }
 239
 240     fd = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_GFX_DMABUF, &plane.dmabuf_id);
 241     if (fd < 0) {
 242         return NULL;
 243     }
 244
 245     dmabuf = g_new0(VFIODMABuf, 1);
 246     dmabuf->dmabuf_id  = plane.dmabuf_id;
 247     dmabuf->buf.width  = plane.width;
 248     dmabuf->buf.height = plane.height;
 249     dmabuf->buf.stride = plane.stride;
 250     dmabuf->buf.fourcc = plane.drm_format;
 251     dmabuf->buf.modifier = plane.drm_format_mod;
 252     dmabuf->buf.fd     = fd;
 253     if (plane_type == DRM_PLANE_TYPE_CURSOR) {
 254         vfio_display_update_cursor(dmabuf, &plane);
 255     }
 256
 257     QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
 258     return dmabuf;
 259 }
 260
 261 static void vfio_display_free_one_dmabuf(VFIODisplay *dpy, VFIODMABuf *dmabuf)
 262 {
 263     QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
 264     dpy_gl_release_dmabuf(dpy->con, &dmabuf->buf);
 265     close(dmabuf->buf.fd);
 266     g_free(dmabuf);
 267 }
 268
 269 static void vfio_display_free_dmabufs(VFIOPCIDevice *vdev)
 270 {
 271     VFIODisplay *dpy = vdev->dpy;
 272     VFIODMABuf *dmabuf, *tmp;
 273     uint32_t keep = 5;
 274
 275     QTAILQ_FOREACH_SAFE(dmabuf, &dpy->dmabuf.bufs, next, tmp) {
 276         if (keep > 0) {
 277             keep--;
 278             continue;
 279         }
 280         assert(dmabuf != dpy->dmabuf.primary);
 281         vfio_display_free_one_dmabuf(dpy, dmabuf);
 282     }
 283 }
 284
 285 static void vfio_display_dmabuf_update(void *opaque)
 286 {
 287     VFIOPCIDevice *vdev = opaque;
 288     VFIODisplay *dpy = vdev->dpy;
 289     VFIODMABuf *primary, *cursor;
 290     bool free_bufs = false, new_cursor = false;;
 291
 292     primary = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_PRIMARY);
 293     if (primary == NULL) {
 294         if (dpy->ramfb) {
 295             ramfb_display_update(dpy->con, dpy->ramfb);
 296         }
 297         return;
 298     }
 299
 300     if (dpy->dmabuf.primary != primary) {
 301         dpy->dmabuf.primary = primary;
 302         qemu_console_resize(dpy->con,
 303                             primary->buf.width, primary->buf.height);
 304         dpy_gl_scanout_dmabuf(dpy->con, &primary->buf);
 305         free_bufs = true;
 306     }
 307
 308     cursor = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_CURSOR);
 309     if (dpy->dmabuf.cursor != cursor) {
 310         dpy->dmabuf.cursor = cursor;
 311         new_cursor = true;
 312         free_bufs = true;
 313     }
 314
 315     if (cursor && (new_cursor || cursor->hot_updates)) {
 316         bool have_hot = (cursor->hot_x != 0xffffffff &&
 317                          cursor->hot_y != 0xffffffff);
 318         dpy_gl_cursor_dmabuf(dpy->con, &cursor->buf, have_hot,
 319                              cursor->hot_x, cursor->hot_y);
 320         cursor->hot_updates = 0;
 321     } else if (!cursor && new_cursor) {
 322         dpy_gl_cursor_dmabuf(dpy->con, NULL, false, 0, 0);
 323     }
 324
 325     if (cursor && cursor->pos_updates) {
 326         dpy_gl_cursor_position(dpy->con,
 327                                cursor->pos_x,
 328                                cursor->pos_y);
 329         cursor->pos_updates = 0;
 330     }
 331
 332     dpy_gl_update(dpy->con, 0, 0, primary->buf.width, primary->buf.height);
 333
 334     if (free_bufs) {
 335         vfio_display_free_dmabufs(vdev);
 336     }
 337 }
 338
 339 static const GraphicHwOps vfio_display_dmabuf_ops = {
 340     .gfx_update = vfio_display_dmabuf_update,
 341     .ui_info    = vfio_display_edid_ui_info,
 342 };
 343
 344 static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
 345 {
 346     if (!display_opengl) {
 347         error_setg(errp, "vfio-display-dmabuf: opengl not available");
 348         return -1;
 349     }
 350
 351     vdev->dpy = g_new0(VFIODisplay, 1);
 352     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
 353                                           &vfio_display_dmabuf_ops,
 354                                           vdev);
 355     if (vdev->enable_ramfb) {
 356         vdev->dpy->ramfb = ramfb_setup(DEVICE(vdev), errp);
 357     }
 358     vfio_display_edid_init(vdev);
 359     return 0;
 360 }
 361
 362 static void vfio_display_dmabuf_exit(VFIODisplay *dpy)
 363 {
 364     VFIODMABuf *dmabuf;
 365
 366     if (QTAILQ_EMPTY(&dpy->dmabuf.bufs)) {
 367         return;
 368     }
 369
 370     while ((dmabuf = QTAILQ_FIRST(&dpy->dmabuf.bufs)) != NULL) {
 371         vfio_display_free_one_dmabuf(dpy, dmabuf);
 372     }
 373 }
 374
 375 /* ---------------------------------------------------------------------- */
 376 void vfio_display_reset(VFIOPCIDevice *vdev)
 377 {
 378     if (!vdev || !vdev->dpy || !vdev->dpy->con ||
 379         !vdev->dpy->dmabuf.primary) {
 380         return;
 381     }
 382
 383     dpy_gl_scanout_disable(vdev->dpy->con);
 384     vfio_display_dmabuf_exit(vdev->dpy);
 385     dpy_gfx_update_full(vdev->dpy->con);
 386 }
 387
 388 static void vfio_display_region_update(void *opaque)
 389 {
 390     VFIOPCIDevice *vdev = opaque;
 391     VFIODisplay *dpy = vdev->dpy;
 392     struct vfio_device_gfx_plane_info plane = {
 393         .argsz = sizeof(plane),
 394         .flags = VFIO_GFX_PLANE_TYPE_REGION
 395     };
 396     pixman_format_code_t format;
 397     int ret;
 398
 399     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
 400     if (ret < 0) {
 401         error_report("ioctl VFIO_DEVICE_QUERY_GFX_PLANE: %s",
 402                      strerror(errno));
 403         return;
 404     }
 405     if (!plane.drm_format || !plane.size) {
 406         if (dpy->ramfb) {
 407             ramfb_display_update(dpy->con, dpy->ramfb);
 408         }
 409         return;
 410     }
 411     format = qemu_drm_format_to_pixman(plane.drm_format);
 412     if (!format) {
 413         return;
 414     }
 415
 416     if (dpy->region.buffer.size &&
 417         dpy->region.buffer.nr != plane.region_index) {
 418         /* region changed */
 419         vfio_region_exit(&dpy->region.buffer);
 420         vfio_region_finalize(&dpy->region.buffer);
 421         dpy->region.surface = NULL;
 422     }
 423
 424     if (dpy->region.surface &&
 425         (surface_width(dpy->region.surface) != plane.width ||
 426          surface_height(dpy->region.surface) != plane.height ||
 427          surface_format(dpy->region.surface) != format)) {
 428         /* size changed */
 429         dpy->region.surface = NULL;
 430     }
 431
 432     if (!dpy->region.buffer.size) {
 433         /* mmap region */
 434         ret = vfio_region_setup(OBJECT(vdev), &vdev->vbasedev,
 435                                 &dpy->region.buffer,
 436                                 plane.region_index,
 437                                 "display");
 438         if (ret != 0) {
 439             error_report("%s: vfio_region_setup(%d): %s",
 440                          __func__, plane.region_index, strerror(-ret));
 441             goto err;
 442         }
 443         ret = vfio_region_mmap(&dpy->region.buffer);
 444         if (ret != 0) {
 445             error_report("%s: vfio_region_mmap(%d): %s", __func__,
 446                          plane.region_index, strerror(-ret));
 447             goto err;
 448         }
 449         assert(dpy->region.buffer.mmaps[0].mmap != NULL);
 450     }
 451
 452     if (dpy->region.surface == NULL) {
 453         /* create surface */
 454         dpy->region.surface = qemu_create_displaysurface_from
 455             (plane.width, plane.height, format,
 456              plane.stride, dpy->region.buffer.mmaps[0].mmap);
 457         dpy_gfx_replace_surface(dpy->con, dpy->region.surface);
 458     }
 459
 460     /* full screen update */
 461     dpy_gfx_update(dpy->con, 0, 0,
 462                    surface_width(dpy->region.surface),
 463                    surface_height(dpy->region.surface));
 464     return;
 465
 466 err:
 467     vfio_region_exit(&dpy->region.buffer);
 468     vfio_region_finalize(&dpy->region.buffer);
 469 }
 470
 471 static const GraphicHwOps vfio_display_region_ops = {
 472     .gfx_update = vfio_display_region_update,
 473 };
 474
 475 static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
 476 {
 477     vdev->dpy = g_new0(VFIODisplay, 1);
 478     vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
 479                                           &vfio_display_region_ops,
 480                                           vdev);
 481     if (vdev->enable_ramfb) {
 482         vdev->dpy->ramfb = ramfb_setup(DEVICE(vdev), errp);
 483     }
 484     return 0;
 485 }
 486
 487 static void vfio_display_region_exit(VFIODisplay *dpy)
 488 {
 489     if (!dpy->region.buffer.size) {
 490         return;
 491     }
 492
 493     vfio_region_exit(&dpy->region.buffer);
 494     vfio_region_finalize(&dpy->region.buffer);
 495 }
 496
 497 /* ---------------------------------------------------------------------- */
 498
 499 int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
 500 {
 501     struct vfio_device_gfx_plane_info probe;
 502     int ret;
 503
 504     memset(&probe, 0, sizeof(probe));
 505     probe.argsz = sizeof(probe);
 506     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
 507     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
 508     if (ret == 0) {
 509         return vfio_display_dmabuf_init(vdev, errp);
 510     }
 511
 512     memset(&probe, 0, sizeof(probe));
 513     probe.argsz = sizeof(probe);
 514     probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
 515     ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
 516     if (ret == 0) {
 517         return vfio_display_region_init(vdev, errp);
 518     }
 519
 520     if (vdev->display == ON_OFF_AUTO_AUTO) {
 521         /* not an error in automatic mode */
 522         return 0;
 523     }
 524
 525     error_setg(errp, "vfio: device doesn't support any (known) display method");
 526     return -1;
 527 }
 528
 529 void vfio_display_finalize(VFIOPCIDevice *vdev)
 530 {
 531     if (!vdev->dpy) {
 532         return;
 533     }
 534
 535     graphic_console_close(vdev->dpy->con);
 536     vfio_display_dmabuf_exit(vdev->dpy);
 537     vfio_display_region_exit(vdev->dpy);
 538     vfio_display_edid_exit(vdev->dpy);
 539     g_free(vdev->dpy);
 540 }