vhost-user-gpu.c (17832B)
1 /* 2 * vhost-user GPU Device 3 * 4 * Copyright Red Hat, Inc. 2018 5 * 6 * Authors: 7 * Marc-André Lureau <marcandre.lureau@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "qemu/sockets.h" 15 #include "hw/qdev-properties.h" 16 #include "hw/virtio/virtio-gpu.h" 17 #include "chardev/char-fe.h" 18 #include "qapi/error.h" 19 #include "migration/blocker.h" 20 21 typedef enum VhostUserGpuRequest { 22 VHOST_USER_GPU_NONE = 0, 23 VHOST_USER_GPU_GET_PROTOCOL_FEATURES, 24 VHOST_USER_GPU_SET_PROTOCOL_FEATURES, 25 VHOST_USER_GPU_GET_DISPLAY_INFO, 26 VHOST_USER_GPU_CURSOR_POS, 27 VHOST_USER_GPU_CURSOR_POS_HIDE, 28 VHOST_USER_GPU_CURSOR_UPDATE, 29 VHOST_USER_GPU_SCANOUT, 30 VHOST_USER_GPU_UPDATE, 31 VHOST_USER_GPU_DMABUF_SCANOUT, 32 VHOST_USER_GPU_DMABUF_UPDATE, 33 } VhostUserGpuRequest; 34 35 typedef struct VhostUserGpuDisplayInfoReply { 36 struct virtio_gpu_resp_display_info info; 37 } VhostUserGpuDisplayInfoReply; 38 39 typedef struct VhostUserGpuCursorPos { 40 uint32_t scanout_id; 41 uint32_t x; 42 uint32_t y; 43 } QEMU_PACKED VhostUserGpuCursorPos; 44 45 typedef struct VhostUserGpuCursorUpdate { 46 VhostUserGpuCursorPos pos; 47 uint32_t hot_x; 48 uint32_t hot_y; 49 uint32_t data[64 * 64]; 50 } QEMU_PACKED VhostUserGpuCursorUpdate; 51 52 typedef struct VhostUserGpuScanout { 53 uint32_t scanout_id; 54 uint32_t width; 55 uint32_t height; 56 } QEMU_PACKED VhostUserGpuScanout; 57 58 typedef struct VhostUserGpuUpdate { 59 uint32_t scanout_id; 60 uint32_t x; 61 uint32_t y; 62 uint32_t width; 63 uint32_t height; 64 uint8_t data[]; 65 } QEMU_PACKED VhostUserGpuUpdate; 66 67 typedef struct VhostUserGpuDMABUFScanout { 68 uint32_t scanout_id; 69 uint32_t x; 70 uint32_t y; 71 uint32_t width; 72 uint32_t height; 73 uint32_t fd_width; 74 uint32_t fd_height; 75 uint32_t fd_stride; 76 uint32_t fd_flags; 77 int fd_drm_fourcc; 78 } QEMU_PACKED VhostUserGpuDMABUFScanout; 79 80 typedef struct VhostUserGpuMsg { 81 uint32_t request; /* VhostUserGpuRequest */ 82 uint32_t flags; 83 uint32_t size; /* the following payload size */ 84 union { 85 VhostUserGpuCursorPos cursor_pos; 86 VhostUserGpuCursorUpdate cursor_update; 87 VhostUserGpuScanout scanout; 88 VhostUserGpuUpdate update; 89 VhostUserGpuDMABUFScanout dmabuf_scanout; 90 struct virtio_gpu_resp_display_info display_info; 91 uint64_t u64; 92 } payload; 93 } QEMU_PACKED VhostUserGpuMsg; 94 95 static VhostUserGpuMsg m __attribute__ ((unused)); 96 #define VHOST_USER_GPU_HDR_SIZE \ 97 (sizeof(m.request) + sizeof(m.size) + sizeof(m.flags)) 98 99 #define VHOST_USER_GPU_MSG_FLAG_REPLY 0x4 100 101 static void vhost_user_gpu_update_blocked(VhostUserGPU *g, bool blocked); 102 103 static void 104 vhost_user_gpu_handle_cursor(VhostUserGPU *g, VhostUserGpuMsg *msg) 105 { 106 VhostUserGpuCursorPos *pos = &msg->payload.cursor_pos; 107 struct virtio_gpu_scanout *s; 108 109 if (pos->scanout_id >= g->parent_obj.conf.max_outputs) { 110 return; 111 } 112 s = &g->parent_obj.scanout[pos->scanout_id]; 113 114 if (msg->request == VHOST_USER_GPU_CURSOR_UPDATE) { 115 VhostUserGpuCursorUpdate *up = &msg->payload.cursor_update; 116 if (!s->current_cursor) { 117 s->current_cursor = cursor_alloc(64, 64); 118 } 119 120 s->current_cursor->hot_x = up->hot_x; 121 s->current_cursor->hot_y = up->hot_y; 122 123 memcpy(s->current_cursor->data, up->data, 124 64 * 64 * sizeof(uint32_t)); 125 126 dpy_cursor_define(s->con, s->current_cursor); 127 } 128 129 dpy_mouse_set(s->con, pos->x, pos->y, 130 msg->request != VHOST_USER_GPU_CURSOR_POS_HIDE); 131 } 132 133 static void 134 vhost_user_gpu_send_msg(VhostUserGPU *g, const VhostUserGpuMsg *msg) 135 { 136 qemu_chr_fe_write(&g->vhost_chr, (uint8_t *)msg, 137 VHOST_USER_GPU_HDR_SIZE + msg->size); 138 } 139 140 static void 141 vhost_user_gpu_unblock(VhostUserGPU *g) 142 { 143 VhostUserGpuMsg msg = { 144 .request = VHOST_USER_GPU_DMABUF_UPDATE, 145 .flags = VHOST_USER_GPU_MSG_FLAG_REPLY, 146 }; 147 148 vhost_user_gpu_send_msg(g, &msg); 149 } 150 151 static void 152 vhost_user_gpu_handle_display(VhostUserGPU *g, VhostUserGpuMsg *msg) 153 { 154 QemuConsole *con = NULL; 155 struct virtio_gpu_scanout *s; 156 157 switch (msg->request) { 158 case VHOST_USER_GPU_GET_PROTOCOL_FEATURES: { 159 VhostUserGpuMsg reply = { 160 .request = msg->request, 161 .flags = VHOST_USER_GPU_MSG_FLAG_REPLY, 162 .size = sizeof(uint64_t), 163 }; 164 165 vhost_user_gpu_send_msg(g, &reply); 166 break; 167 } 168 case VHOST_USER_GPU_SET_PROTOCOL_FEATURES: { 169 break; 170 } 171 case VHOST_USER_GPU_GET_DISPLAY_INFO: { 172 struct virtio_gpu_resp_display_info display_info = { {} }; 173 VhostUserGpuMsg reply = { 174 .request = msg->request, 175 .flags = VHOST_USER_GPU_MSG_FLAG_REPLY, 176 .size = sizeof(struct virtio_gpu_resp_display_info), 177 }; 178 179 display_info.hdr.type = VIRTIO_GPU_RESP_OK_DISPLAY_INFO; 180 virtio_gpu_base_fill_display_info(VIRTIO_GPU_BASE(g), &display_info); 181 memcpy(&reply.payload.display_info, &display_info, 182 sizeof(display_info)); 183 vhost_user_gpu_send_msg(g, &reply); 184 break; 185 } 186 case VHOST_USER_GPU_SCANOUT: { 187 VhostUserGpuScanout *m = &msg->payload.scanout; 188 189 if (m->scanout_id >= g->parent_obj.conf.max_outputs) { 190 return; 191 } 192 193 g->parent_obj.enable = 1; 194 s = &g->parent_obj.scanout[m->scanout_id]; 195 con = s->con; 196 197 if (m->width == 0) { 198 dpy_gfx_replace_surface(con, NULL); 199 } else { 200 s->ds = qemu_create_displaysurface(m->width, m->height); 201 /* replace surface on next update */ 202 } 203 204 break; 205 } 206 case VHOST_USER_GPU_DMABUF_SCANOUT: { 207 VhostUserGpuDMABUFScanout *m = &msg->payload.dmabuf_scanout; 208 int fd = qemu_chr_fe_get_msgfd(&g->vhost_chr); 209 QemuDmaBuf *dmabuf; 210 211 if (m->scanout_id >= g->parent_obj.conf.max_outputs) { 212 error_report("invalid scanout: %d", m->scanout_id); 213 if (fd >= 0) { 214 close(fd); 215 } 216 break; 217 } 218 219 g->parent_obj.enable = 1; 220 con = g->parent_obj.scanout[m->scanout_id].con; 221 dmabuf = &g->dmabuf[m->scanout_id]; 222 if (dmabuf->fd >= 0) { 223 close(dmabuf->fd); 224 dmabuf->fd = -1; 225 } 226 dpy_gl_release_dmabuf(con, dmabuf); 227 if (fd == -1) { 228 dpy_gl_scanout_disable(con); 229 break; 230 } 231 *dmabuf = (QemuDmaBuf) { 232 .fd = fd, 233 .width = m->fd_width, 234 .height = m->fd_height, 235 .stride = m->fd_stride, 236 .fourcc = m->fd_drm_fourcc, 237 .y0_top = m->fd_flags & VIRTIO_GPU_RESOURCE_FLAG_Y_0_TOP, 238 }; 239 dpy_gl_scanout_dmabuf(con, dmabuf); 240 break; 241 } 242 case VHOST_USER_GPU_DMABUF_UPDATE: { 243 VhostUserGpuUpdate *m = &msg->payload.update; 244 245 if (m->scanout_id >= g->parent_obj.conf.max_outputs || 246 !g->parent_obj.scanout[m->scanout_id].con) { 247 error_report("invalid scanout update: %d", m->scanout_id); 248 vhost_user_gpu_unblock(g); 249 break; 250 } 251 252 con = g->parent_obj.scanout[m->scanout_id].con; 253 if (!console_has_gl(con)) { 254 error_report("console doesn't support GL!"); 255 vhost_user_gpu_unblock(g); 256 break; 257 } 258 g->backend_blocked = true; 259 dpy_gl_update(con, m->x, m->y, m->width, m->height); 260 break; 261 } 262 case VHOST_USER_GPU_UPDATE: { 263 VhostUserGpuUpdate *m = &msg->payload.update; 264 265 if (m->scanout_id >= g->parent_obj.conf.max_outputs) { 266 break; 267 } 268 s = &g->parent_obj.scanout[m->scanout_id]; 269 con = s->con; 270 pixman_image_t *image = 271 pixman_image_create_bits(PIXMAN_x8r8g8b8, 272 m->width, 273 m->height, 274 (uint32_t *)m->data, 275 m->width * 4); 276 277 pixman_image_composite(PIXMAN_OP_SRC, 278 image, NULL, s->ds->image, 279 0, 0, 0, 0, m->x, m->y, m->width, m->height); 280 281 pixman_image_unref(image); 282 if (qemu_console_surface(con) != s->ds) { 283 dpy_gfx_replace_surface(con, s->ds); 284 } else { 285 dpy_gfx_update(con, m->x, m->y, m->width, m->height); 286 } 287 break; 288 } 289 default: 290 g_warning("unhandled message %d %d", msg->request, msg->size); 291 } 292 293 if (con && qemu_console_is_gl_blocked(con)) { 294 vhost_user_gpu_update_blocked(g, true); 295 } 296 } 297 298 static void 299 vhost_user_gpu_chr_read(void *opaque) 300 { 301 VhostUserGPU *g = opaque; 302 VhostUserGpuMsg *msg = NULL; 303 VhostUserGpuRequest request; 304 uint32_t size, flags; 305 int r; 306 307 r = qemu_chr_fe_read_all(&g->vhost_chr, 308 (uint8_t *)&request, sizeof(uint32_t)); 309 if (r != sizeof(uint32_t)) { 310 error_report("failed to read msg header: %d, %d", r, errno); 311 goto end; 312 } 313 314 r = qemu_chr_fe_read_all(&g->vhost_chr, 315 (uint8_t *)&flags, sizeof(uint32_t)); 316 if (r != sizeof(uint32_t)) { 317 error_report("failed to read msg flags"); 318 goto end; 319 } 320 321 r = qemu_chr_fe_read_all(&g->vhost_chr, 322 (uint8_t *)&size, sizeof(uint32_t)); 323 if (r != sizeof(uint32_t)) { 324 error_report("failed to read msg size"); 325 goto end; 326 } 327 328 msg = g_malloc(VHOST_USER_GPU_HDR_SIZE + size); 329 330 r = qemu_chr_fe_read_all(&g->vhost_chr, 331 (uint8_t *)&msg->payload, size); 332 if (r != size) { 333 error_report("failed to read msg payload %d != %d", r, size); 334 goto end; 335 } 336 337 msg->request = request; 338 msg->flags = size; 339 msg->size = size; 340 341 if (request == VHOST_USER_GPU_CURSOR_UPDATE || 342 request == VHOST_USER_GPU_CURSOR_POS || 343 request == VHOST_USER_GPU_CURSOR_POS_HIDE) { 344 vhost_user_gpu_handle_cursor(g, msg); 345 } else { 346 vhost_user_gpu_handle_display(g, msg); 347 } 348 349 end: 350 g_free(msg); 351 } 352 353 static void 354 vhost_user_gpu_update_blocked(VhostUserGPU *g, bool blocked) 355 { 356 qemu_set_fd_handler(g->vhost_gpu_fd, 357 blocked ? NULL : vhost_user_gpu_chr_read, NULL, g); 358 } 359 360 static void 361 vhost_user_gpu_gl_flushed(VirtIOGPUBase *b) 362 { 363 VhostUserGPU *g = VHOST_USER_GPU(b); 364 365 if (g->backend_blocked) { 366 vhost_user_gpu_unblock(VHOST_USER_GPU(g)); 367 g->backend_blocked = false; 368 } 369 370 vhost_user_gpu_update_blocked(VHOST_USER_GPU(g), false); 371 } 372 373 static bool 374 vhost_user_gpu_do_set_socket(VhostUserGPU *g, Error **errp) 375 { 376 Chardev *chr; 377 int sv[2]; 378 379 if (qemu_socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { 380 error_setg_errno(errp, errno, "socketpair() failed"); 381 return false; 382 } 383 384 chr = CHARDEV(object_new(TYPE_CHARDEV_SOCKET)); 385 if (!chr || qemu_chr_add_client(chr, sv[0]) == -1) { 386 error_setg(errp, "Failed to make socket chardev"); 387 goto err; 388 } 389 if (!qemu_chr_fe_init(&g->vhost_chr, chr, errp)) { 390 goto err; 391 } 392 if (vhost_user_gpu_set_socket(&g->vhost->dev, sv[1]) < 0) { 393 error_setg(errp, "Failed to set vhost-user-gpu socket"); 394 qemu_chr_fe_deinit(&g->vhost_chr, false); 395 goto err; 396 } 397 398 g->vhost_gpu_fd = sv[0]; 399 vhost_user_gpu_update_blocked(g, false); 400 close(sv[1]); 401 return true; 402 403 err: 404 close(sv[0]); 405 close(sv[1]); 406 if (chr) { 407 object_unref(OBJECT(chr)); 408 } 409 return false; 410 } 411 412 static void 413 vhost_user_gpu_get_config(VirtIODevice *vdev, uint8_t *config_data) 414 { 415 VhostUserGPU *g = VHOST_USER_GPU(vdev); 416 VirtIOGPUBase *b = VIRTIO_GPU_BASE(vdev); 417 struct virtio_gpu_config *vgconfig = 418 (struct virtio_gpu_config *)config_data; 419 Error *local_err = NULL; 420 int ret; 421 422 memset(config_data, 0, sizeof(struct virtio_gpu_config)); 423 424 ret = vhost_dev_get_config(&g->vhost->dev, 425 config_data, sizeof(struct virtio_gpu_config), 426 &local_err); 427 if (ret) { 428 error_report_err(local_err); 429 return; 430 } 431 432 /* those fields are managed by qemu */ 433 vgconfig->num_scanouts = b->virtio_config.num_scanouts; 434 vgconfig->events_read = b->virtio_config.events_read; 435 vgconfig->events_clear = b->virtio_config.events_clear; 436 } 437 438 static void 439 vhost_user_gpu_set_config(VirtIODevice *vdev, 440 const uint8_t *config_data) 441 { 442 VhostUserGPU *g = VHOST_USER_GPU(vdev); 443 VirtIOGPUBase *b = VIRTIO_GPU_BASE(vdev); 444 const struct virtio_gpu_config *vgconfig = 445 (const struct virtio_gpu_config *)config_data; 446 int ret; 447 448 if (vgconfig->events_clear) { 449 b->virtio_config.events_read &= ~vgconfig->events_clear; 450 } 451 452 ret = vhost_dev_set_config(&g->vhost->dev, config_data, 453 0, sizeof(struct virtio_gpu_config), 454 VHOST_SET_CONFIG_TYPE_MASTER); 455 if (ret) { 456 error_report("vhost-user-gpu: set device config space failed"); 457 return; 458 } 459 } 460 461 static void 462 vhost_user_gpu_set_status(VirtIODevice *vdev, uint8_t val) 463 { 464 VhostUserGPU *g = VHOST_USER_GPU(vdev); 465 Error *err = NULL; 466 467 if (val & VIRTIO_CONFIG_S_DRIVER_OK && vdev->vm_running) { 468 if (!vhost_user_gpu_do_set_socket(g, &err)) { 469 error_report_err(err); 470 return; 471 } 472 vhost_user_backend_start(g->vhost); 473 } else { 474 /* unblock any wait and stop processing */ 475 if (g->vhost_gpu_fd != -1) { 476 vhost_user_gpu_update_blocked(g, true); 477 qemu_chr_fe_deinit(&g->vhost_chr, true); 478 g->vhost_gpu_fd = -1; 479 } 480 vhost_user_backend_stop(g->vhost); 481 } 482 } 483 484 static bool 485 vhost_user_gpu_guest_notifier_pending(VirtIODevice *vdev, int idx) 486 { 487 VhostUserGPU *g = VHOST_USER_GPU(vdev); 488 489 return vhost_virtqueue_pending(&g->vhost->dev, idx); 490 } 491 492 static void 493 vhost_user_gpu_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask) 494 { 495 VhostUserGPU *g = VHOST_USER_GPU(vdev); 496 497 vhost_virtqueue_mask(&g->vhost->dev, vdev, idx, mask); 498 } 499 500 static void 501 vhost_user_gpu_instance_init(Object *obj) 502 { 503 VhostUserGPU *g = VHOST_USER_GPU(obj); 504 505 g->vhost = VHOST_USER_BACKEND(object_new(TYPE_VHOST_USER_BACKEND)); 506 object_property_add_alias(obj, "chardev", 507 OBJECT(g->vhost), "chardev"); 508 } 509 510 static void 511 vhost_user_gpu_instance_finalize(Object *obj) 512 { 513 VhostUserGPU *g = VHOST_USER_GPU(obj); 514 515 object_unref(OBJECT(g->vhost)); 516 } 517 518 static void 519 vhost_user_gpu_reset(VirtIODevice *vdev) 520 { 521 VhostUserGPU *g = VHOST_USER_GPU(vdev); 522 523 virtio_gpu_base_reset(VIRTIO_GPU_BASE(vdev)); 524 525 vhost_user_backend_stop(g->vhost); 526 } 527 528 static int 529 vhost_user_gpu_config_change(struct vhost_dev *dev) 530 { 531 error_report("vhost-user-gpu: unhandled backend config change"); 532 return -1; 533 } 534 535 static const VhostDevConfigOps config_ops = { 536 .vhost_dev_config_notifier = vhost_user_gpu_config_change, 537 }; 538 539 static void 540 vhost_user_gpu_device_realize(DeviceState *qdev, Error **errp) 541 { 542 VhostUserGPU *g = VHOST_USER_GPU(qdev); 543 VirtIODevice *vdev = VIRTIO_DEVICE(g); 544 545 vhost_dev_set_config_notifier(&g->vhost->dev, &config_ops); 546 if (vhost_user_backend_dev_init(g->vhost, vdev, 2, errp) < 0) { 547 return; 548 } 549 550 /* existing backend may send DMABUF, so let's add that requirement */ 551 g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_DMABUF_ENABLED; 552 if (virtio_has_feature(g->vhost->dev.features, VIRTIO_GPU_F_VIRGL)) { 553 g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_VIRGL_ENABLED; 554 } 555 if (virtio_has_feature(g->vhost->dev.features, VIRTIO_GPU_F_EDID)) { 556 g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_EDID_ENABLED; 557 } else { 558 error_report("EDID requested but the backend doesn't support it."); 559 g->parent_obj.conf.flags &= ~(1 << VIRTIO_GPU_FLAG_EDID_ENABLED); 560 } 561 562 if (!virtio_gpu_base_device_realize(qdev, NULL, NULL, errp)) { 563 return; 564 } 565 566 g->vhost_gpu_fd = -1; 567 } 568 569 static struct vhost_dev *vhost_user_gpu_get_vhost(VirtIODevice *vdev) 570 { 571 VhostUserGPU *g = VHOST_USER_GPU(vdev); 572 return &g->vhost->dev; 573 } 574 575 static Property vhost_user_gpu_properties[] = { 576 VIRTIO_GPU_BASE_PROPERTIES(VhostUserGPU, parent_obj.conf), 577 DEFINE_PROP_END_OF_LIST(), 578 }; 579 580 static void 581 vhost_user_gpu_class_init(ObjectClass *klass, void *data) 582 { 583 DeviceClass *dc = DEVICE_CLASS(klass); 584 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 585 VirtIOGPUBaseClass *vgc = VIRTIO_GPU_BASE_CLASS(klass); 586 587 vgc->gl_flushed = vhost_user_gpu_gl_flushed; 588 589 vdc->realize = vhost_user_gpu_device_realize; 590 vdc->reset = vhost_user_gpu_reset; 591 vdc->set_status = vhost_user_gpu_set_status; 592 vdc->guest_notifier_mask = vhost_user_gpu_guest_notifier_mask; 593 vdc->guest_notifier_pending = vhost_user_gpu_guest_notifier_pending; 594 vdc->get_config = vhost_user_gpu_get_config; 595 vdc->set_config = vhost_user_gpu_set_config; 596 vdc->get_vhost = vhost_user_gpu_get_vhost; 597 598 device_class_set_props(dc, vhost_user_gpu_properties); 599 } 600 601 static const TypeInfo vhost_user_gpu_info = { 602 .name = TYPE_VHOST_USER_GPU, 603 .parent = TYPE_VIRTIO_GPU_BASE, 604 .instance_size = sizeof(VhostUserGPU), 605 .instance_init = vhost_user_gpu_instance_init, 606 .instance_finalize = vhost_user_gpu_instance_finalize, 607 .class_init = vhost_user_gpu_class_init, 608 }; 609 module_obj(TYPE_VHOST_USER_GPU); 610 module_kconfig(VHOST_USER_GPU); 611 612 static void vhost_user_gpu_register_types(void) 613 { 614 type_register_static(&vhost_user_gpu_info); 615 } 616 617 type_init(vhost_user_gpu_register_types)