vhost-user-gpu.c (17576B)
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 "hw/qdev-properties.h" 15#include "hw/virtio/virtio-gpu.h" 16#include "chardev/char-fe.h" 17#include "qapi/error.h" 18#include "migration/blocker.h" 19 20typedef enum VhostUserGpuRequest { 21 VHOST_USER_GPU_NONE = 0, 22 VHOST_USER_GPU_GET_PROTOCOL_FEATURES, 23 VHOST_USER_GPU_SET_PROTOCOL_FEATURES, 24 VHOST_USER_GPU_GET_DISPLAY_INFO, 25 VHOST_USER_GPU_CURSOR_POS, 26 VHOST_USER_GPU_CURSOR_POS_HIDE, 27 VHOST_USER_GPU_CURSOR_UPDATE, 28 VHOST_USER_GPU_SCANOUT, 29 VHOST_USER_GPU_UPDATE, 30 VHOST_USER_GPU_DMABUF_SCANOUT, 31 VHOST_USER_GPU_DMABUF_UPDATE, 32} VhostUserGpuRequest; 33 34typedef struct VhostUserGpuDisplayInfoReply { 35 struct virtio_gpu_resp_display_info info; 36} VhostUserGpuDisplayInfoReply; 37 38typedef struct VhostUserGpuCursorPos { 39 uint32_t scanout_id; 40 uint32_t x; 41 uint32_t y; 42} QEMU_PACKED VhostUserGpuCursorPos; 43 44typedef struct VhostUserGpuCursorUpdate { 45 VhostUserGpuCursorPos pos; 46 uint32_t hot_x; 47 uint32_t hot_y; 48 uint32_t data[64 * 64]; 49} QEMU_PACKED VhostUserGpuCursorUpdate; 50 51typedef struct VhostUserGpuScanout { 52 uint32_t scanout_id; 53 uint32_t width; 54 uint32_t height; 55} QEMU_PACKED VhostUserGpuScanout; 56 57typedef struct VhostUserGpuUpdate { 58 uint32_t scanout_id; 59 uint32_t x; 60 uint32_t y; 61 uint32_t width; 62 uint32_t height; 63 uint8_t data[]; 64} QEMU_PACKED VhostUserGpuUpdate; 65 66typedef struct VhostUserGpuDMABUFScanout { 67 uint32_t scanout_id; 68 uint32_t x; 69 uint32_t y; 70 uint32_t width; 71 uint32_t height; 72 uint32_t fd_width; 73 uint32_t fd_height; 74 uint32_t fd_stride; 75 uint32_t fd_flags; 76 int fd_drm_fourcc; 77} QEMU_PACKED VhostUserGpuDMABUFScanout; 78 79typedef struct VhostUserGpuMsg { 80 uint32_t request; /* VhostUserGpuRequest */ 81 uint32_t flags; 82 uint32_t size; /* the following payload size */ 83 union { 84 VhostUserGpuCursorPos cursor_pos; 85 VhostUserGpuCursorUpdate cursor_update; 86 VhostUserGpuScanout scanout; 87 VhostUserGpuUpdate update; 88 VhostUserGpuDMABUFScanout dmabuf_scanout; 89 struct virtio_gpu_resp_display_info display_info; 90 uint64_t u64; 91 } payload; 92} QEMU_PACKED VhostUserGpuMsg; 93 94static VhostUserGpuMsg m __attribute__ ((unused)); 95#define VHOST_USER_GPU_HDR_SIZE \ 96 (sizeof(m.request) + sizeof(m.size) + sizeof(m.flags)) 97 98#define VHOST_USER_GPU_MSG_FLAG_REPLY 0x4 99 100static void vhost_user_gpu_update_blocked(VhostUserGPU *g, bool blocked); 101 102static void 103vhost_user_gpu_handle_cursor(VhostUserGPU *g, VhostUserGpuMsg *msg) 104{ 105 VhostUserGpuCursorPos *pos = &msg->payload.cursor_pos; 106 struct virtio_gpu_scanout *s; 107 108 if (pos->scanout_id >= g->parent_obj.conf.max_outputs) { 109 return; 110 } 111 s = &g->parent_obj.scanout[pos->scanout_id]; 112 113 if (msg->request == VHOST_USER_GPU_CURSOR_UPDATE) { 114 VhostUserGpuCursorUpdate *up = &msg->payload.cursor_update; 115 if (!s->current_cursor) { 116 s->current_cursor = cursor_alloc(64, 64); 117 } 118 119 s->current_cursor->hot_x = up->hot_x; 120 s->current_cursor->hot_y = up->hot_y; 121 122 memcpy(s->current_cursor->data, up->data, 123 64 * 64 * sizeof(uint32_t)); 124 125 dpy_cursor_define(s->con, s->current_cursor); 126 } 127 128 dpy_mouse_set(s->con, pos->x, pos->y, 129 msg->request != VHOST_USER_GPU_CURSOR_POS_HIDE); 130} 131 132static void 133vhost_user_gpu_send_msg(VhostUserGPU *g, const VhostUserGpuMsg *msg) 134{ 135 qemu_chr_fe_write(&g->vhost_chr, (uint8_t *)msg, 136 VHOST_USER_GPU_HDR_SIZE + msg->size); 137} 138 139static void 140vhost_user_gpu_unblock(VhostUserGPU *g) 141{ 142 VhostUserGpuMsg msg = { 143 .request = VHOST_USER_GPU_DMABUF_UPDATE, 144 .flags = VHOST_USER_GPU_MSG_FLAG_REPLY, 145 }; 146 147 vhost_user_gpu_send_msg(g, &msg); 148} 149 150static void 151vhost_user_gpu_handle_display(VhostUserGPU *g, VhostUserGpuMsg *msg) 152{ 153 QemuConsole *con = NULL; 154 struct virtio_gpu_scanout *s; 155 156 switch (msg->request) { 157 case VHOST_USER_GPU_GET_PROTOCOL_FEATURES: { 158 VhostUserGpuMsg reply = { 159 .request = msg->request, 160 .flags = VHOST_USER_GPU_MSG_FLAG_REPLY, 161 .size = sizeof(uint64_t), 162 }; 163 164 vhost_user_gpu_send_msg(g, &reply); 165 break; 166 } 167 case VHOST_USER_GPU_SET_PROTOCOL_FEATURES: { 168 break; 169 } 170 case VHOST_USER_GPU_GET_DISPLAY_INFO: { 171 struct virtio_gpu_resp_display_info display_info = { {} }; 172 VhostUserGpuMsg reply = { 173 .request = msg->request, 174 .flags = VHOST_USER_GPU_MSG_FLAG_REPLY, 175 .size = sizeof(struct virtio_gpu_resp_display_info), 176 }; 177 178 display_info.hdr.type = VIRTIO_GPU_RESP_OK_DISPLAY_INFO; 179 virtio_gpu_base_fill_display_info(VIRTIO_GPU_BASE(g), &display_info); 180 memcpy(&reply.payload.display_info, &display_info, 181 sizeof(display_info)); 182 vhost_user_gpu_send_msg(g, &reply); 183 break; 184 } 185 case VHOST_USER_GPU_SCANOUT: { 186 VhostUserGpuScanout *m = &msg->payload.scanout; 187 188 if (m->scanout_id >= g->parent_obj.conf.max_outputs) { 189 return; 190 } 191 192 g->parent_obj.enable = 1; 193 s = &g->parent_obj.scanout[m->scanout_id]; 194 con = s->con; 195 196 if (m->width == 0) { 197 dpy_gfx_replace_surface(con, NULL); 198 } else { 199 s->ds = qemu_create_displaysurface(m->width, m->height); 200 /* replace surface on next update */ 201 } 202 203 break; 204 } 205 case VHOST_USER_GPU_DMABUF_SCANOUT: { 206 VhostUserGpuDMABUFScanout *m = &msg->payload.dmabuf_scanout; 207 int fd = qemu_chr_fe_get_msgfd(&g->vhost_chr); 208 QemuDmaBuf *dmabuf; 209 210 if (m->scanout_id >= g->parent_obj.conf.max_outputs) { 211 error_report("invalid scanout: %d", m->scanout_id); 212 if (fd >= 0) { 213 close(fd); 214 } 215 break; 216 } 217 218 g->parent_obj.enable = 1; 219 con = g->parent_obj.scanout[m->scanout_id].con; 220 dmabuf = &g->dmabuf[m->scanout_id]; 221 if (dmabuf->fd >= 0) { 222 close(dmabuf->fd); 223 dmabuf->fd = -1; 224 } 225 dpy_gl_release_dmabuf(con, dmabuf); 226 if (fd == -1) { 227 dpy_gl_scanout_disable(con); 228 break; 229 } 230 *dmabuf = (QemuDmaBuf) { 231 .fd = fd, 232 .width = m->fd_width, 233 .height = m->fd_height, 234 .stride = m->fd_stride, 235 .fourcc = m->fd_drm_fourcc, 236 .y0_top = m->fd_flags & VIRTIO_GPU_RESOURCE_FLAG_Y_0_TOP, 237 }; 238 dpy_gl_scanout_dmabuf(con, dmabuf); 239 break; 240 } 241 case VHOST_USER_GPU_DMABUF_UPDATE: { 242 VhostUserGpuUpdate *m = &msg->payload.update; 243 244 if (m->scanout_id >= g->parent_obj.conf.max_outputs || 245 !g->parent_obj.scanout[m->scanout_id].con) { 246 error_report("invalid scanout update: %d", m->scanout_id); 247 vhost_user_gpu_unblock(g); 248 break; 249 } 250 251 con = g->parent_obj.scanout[m->scanout_id].con; 252 if (!console_has_gl(con)) { 253 error_report("console doesn't support GL!"); 254 vhost_user_gpu_unblock(g); 255 break; 256 } 257 dpy_gl_update(con, m->x, m->y, m->width, m->height); 258 g->backend_blocked = true; 259 break; 260 } 261 case VHOST_USER_GPU_UPDATE: { 262 VhostUserGpuUpdate *m = &msg->payload.update; 263 264 if (m->scanout_id >= g->parent_obj.conf.max_outputs) { 265 break; 266 } 267 s = &g->parent_obj.scanout[m->scanout_id]; 268 con = s->con; 269 pixman_image_t *image = 270 pixman_image_create_bits(PIXMAN_x8r8g8b8, 271 m->width, 272 m->height, 273 (uint32_t *)m->data, 274 m->width * 4); 275 276 pixman_image_composite(PIXMAN_OP_SRC, 277 image, NULL, s->ds->image, 278 0, 0, 0, 0, m->x, m->y, m->width, m->height); 279 280 pixman_image_unref(image); 281 if (qemu_console_surface(con) != s->ds) { 282 dpy_gfx_replace_surface(con, s->ds); 283 } else { 284 dpy_gfx_update(con, m->x, m->y, m->width, m->height); 285 } 286 break; 287 } 288 default: 289 g_warning("unhandled message %d %d", msg->request, msg->size); 290 } 291 292 if (con && qemu_console_is_gl_blocked(con)) { 293 vhost_user_gpu_update_blocked(g, true); 294 } 295} 296 297static void 298vhost_user_gpu_chr_read(void *opaque) 299{ 300 VhostUserGPU *g = opaque; 301 VhostUserGpuMsg *msg = NULL; 302 VhostUserGpuRequest request; 303 uint32_t size, flags; 304 int r; 305 306 r = qemu_chr_fe_read_all(&g->vhost_chr, 307 (uint8_t *)&request, sizeof(uint32_t)); 308 if (r != sizeof(uint32_t)) { 309 error_report("failed to read msg header: %d, %d", r, errno); 310 goto end; 311 } 312 313 r = qemu_chr_fe_read_all(&g->vhost_chr, 314 (uint8_t *)&flags, sizeof(uint32_t)); 315 if (r != sizeof(uint32_t)) { 316 error_report("failed to read msg flags"); 317 goto end; 318 } 319 320 r = qemu_chr_fe_read_all(&g->vhost_chr, 321 (uint8_t *)&size, sizeof(uint32_t)); 322 if (r != sizeof(uint32_t)) { 323 error_report("failed to read msg size"); 324 goto end; 325 } 326 327 msg = g_malloc(VHOST_USER_GPU_HDR_SIZE + size); 328 329 r = qemu_chr_fe_read_all(&g->vhost_chr, 330 (uint8_t *)&msg->payload, size); 331 if (r != size) { 332 error_report("failed to read msg payload %d != %d", r, size); 333 goto end; 334 } 335 336 msg->request = request; 337 msg->flags = size; 338 msg->size = size; 339 340 if (request == VHOST_USER_GPU_CURSOR_UPDATE || 341 request == VHOST_USER_GPU_CURSOR_POS || 342 request == VHOST_USER_GPU_CURSOR_POS_HIDE) { 343 vhost_user_gpu_handle_cursor(g, msg); 344 } else { 345 vhost_user_gpu_handle_display(g, msg); 346 } 347 348end: 349 g_free(msg); 350} 351 352static void 353vhost_user_gpu_update_blocked(VhostUserGPU *g, bool blocked) 354{ 355 qemu_set_fd_handler(g->vhost_gpu_fd, 356 blocked ? NULL : vhost_user_gpu_chr_read, NULL, g); 357} 358 359static void 360vhost_user_gpu_gl_flushed(VirtIOGPUBase *b) 361{ 362 VhostUserGPU *g = VHOST_USER_GPU(b); 363 364 if (g->backend_blocked) { 365 vhost_user_gpu_unblock(VHOST_USER_GPU(g)); 366 g->backend_blocked = false; 367 } 368 369 vhost_user_gpu_update_blocked(VHOST_USER_GPU(g), false); 370} 371 372static bool 373vhost_user_gpu_do_set_socket(VhostUserGPU *g, Error **errp) 374{ 375 Chardev *chr; 376 int sv[2]; 377 378 if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { 379 error_setg_errno(errp, errno, "socketpair() failed"); 380 return false; 381 } 382 383 chr = CHARDEV(object_new(TYPE_CHARDEV_SOCKET)); 384 if (!chr || qemu_chr_add_client(chr, sv[0]) == -1) { 385 error_setg(errp, "Failed to make socket chardev"); 386 goto err; 387 } 388 if (!qemu_chr_fe_init(&g->vhost_chr, chr, errp)) { 389 goto err; 390 } 391 if (vhost_user_gpu_set_socket(&g->vhost->dev, sv[1]) < 0) { 392 error_setg(errp, "Failed to set vhost-user-gpu socket"); 393 qemu_chr_fe_deinit(&g->vhost_chr, false); 394 goto err; 395 } 396 397 g->vhost_gpu_fd = sv[0]; 398 vhost_user_gpu_update_blocked(g, false); 399 close(sv[1]); 400 return true; 401 402err: 403 close(sv[0]); 404 close(sv[1]); 405 if (chr) { 406 object_unref(OBJECT(chr)); 407 } 408 return false; 409} 410 411static void 412vhost_user_gpu_get_config(VirtIODevice *vdev, uint8_t *config_data) 413{ 414 VhostUserGPU *g = VHOST_USER_GPU(vdev); 415 VirtIOGPUBase *b = VIRTIO_GPU_BASE(vdev); 416 struct virtio_gpu_config *vgconfig = 417 (struct virtio_gpu_config *)config_data; 418 Error *local_err = NULL; 419 int ret; 420 421 memset(config_data, 0, sizeof(struct virtio_gpu_config)); 422 423 ret = vhost_dev_get_config(&g->vhost->dev, 424 config_data, sizeof(struct virtio_gpu_config), 425 &local_err); 426 if (ret) { 427 error_report_err(local_err); 428 return; 429 } 430 431 /* those fields are managed by qemu */ 432 vgconfig->num_scanouts = b->virtio_config.num_scanouts; 433 vgconfig->events_read = b->virtio_config.events_read; 434 vgconfig->events_clear = b->virtio_config.events_clear; 435} 436 437static void 438vhost_user_gpu_set_config(VirtIODevice *vdev, 439 const uint8_t *config_data) 440{ 441 VhostUserGPU *g = VHOST_USER_GPU(vdev); 442 VirtIOGPUBase *b = VIRTIO_GPU_BASE(vdev); 443 const struct virtio_gpu_config *vgconfig = 444 (const struct virtio_gpu_config *)config_data; 445 int ret; 446 447 if (vgconfig->events_clear) { 448 b->virtio_config.events_read &= ~vgconfig->events_clear; 449 } 450 451 ret = vhost_dev_set_config(&g->vhost->dev, config_data, 452 0, sizeof(struct virtio_gpu_config), 453 VHOST_SET_CONFIG_TYPE_MASTER); 454 if (ret) { 455 error_report("vhost-user-gpu: set device config space failed"); 456 return; 457 } 458} 459 460static void 461vhost_user_gpu_set_status(VirtIODevice *vdev, uint8_t val) 462{ 463 VhostUserGPU *g = VHOST_USER_GPU(vdev); 464 Error *err = NULL; 465 466 if (val & VIRTIO_CONFIG_S_DRIVER_OK && vdev->vm_running) { 467 if (!vhost_user_gpu_do_set_socket(g, &err)) { 468 error_report_err(err); 469 return; 470 } 471 vhost_user_backend_start(g->vhost); 472 } else { 473 /* unblock any wait and stop processing */ 474 if (g->vhost_gpu_fd != -1) { 475 vhost_user_gpu_update_blocked(g, true); 476 qemu_chr_fe_deinit(&g->vhost_chr, true); 477 g->vhost_gpu_fd = -1; 478 } 479 vhost_user_backend_stop(g->vhost); 480 } 481} 482 483static bool 484vhost_user_gpu_guest_notifier_pending(VirtIODevice *vdev, int idx) 485{ 486 VhostUserGPU *g = VHOST_USER_GPU(vdev); 487 488 return vhost_virtqueue_pending(&g->vhost->dev, idx); 489} 490 491static void 492vhost_user_gpu_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask) 493{ 494 VhostUserGPU *g = VHOST_USER_GPU(vdev); 495 496 vhost_virtqueue_mask(&g->vhost->dev, vdev, idx, mask); 497} 498 499static void 500vhost_user_gpu_instance_init(Object *obj) 501{ 502 VhostUserGPU *g = VHOST_USER_GPU(obj); 503 504 g->vhost = VHOST_USER_BACKEND(object_new(TYPE_VHOST_USER_BACKEND)); 505 object_property_add_alias(obj, "chardev", 506 OBJECT(g->vhost), "chardev"); 507} 508 509static void 510vhost_user_gpu_instance_finalize(Object *obj) 511{ 512 VhostUserGPU *g = VHOST_USER_GPU(obj); 513 514 object_unref(OBJECT(g->vhost)); 515} 516 517static void 518vhost_user_gpu_reset(VirtIODevice *vdev) 519{ 520 VhostUserGPU *g = VHOST_USER_GPU(vdev); 521 522 virtio_gpu_base_reset(VIRTIO_GPU_BASE(vdev)); 523 524 vhost_user_backend_stop(g->vhost); 525} 526 527static int 528vhost_user_gpu_config_change(struct vhost_dev *dev) 529{ 530 error_report("vhost-user-gpu: unhandled backend config change"); 531 return -1; 532} 533 534static const VhostDevConfigOps config_ops = { 535 .vhost_dev_config_notifier = vhost_user_gpu_config_change, 536}; 537 538static void 539vhost_user_gpu_device_realize(DeviceState *qdev, Error **errp) 540{ 541 VhostUserGPU *g = VHOST_USER_GPU(qdev); 542 VirtIODevice *vdev = VIRTIO_DEVICE(g); 543 544 vhost_dev_set_config_notifier(&g->vhost->dev, &config_ops); 545 if (vhost_user_backend_dev_init(g->vhost, vdev, 2, errp) < 0) { 546 return; 547 } 548 549 /* existing backend may send DMABUF, so let's add that requirement */ 550 g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_DMABUF_ENABLED; 551 if (virtio_has_feature(g->vhost->dev.features, VIRTIO_GPU_F_VIRGL)) { 552 g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_VIRGL_ENABLED; 553 } 554 if (virtio_has_feature(g->vhost->dev.features, VIRTIO_GPU_F_EDID)) { 555 g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_EDID_ENABLED; 556 } else { 557 error_report("EDID requested but the backend doesn't support it."); 558 g->parent_obj.conf.flags &= ~(1 << VIRTIO_GPU_FLAG_EDID_ENABLED); 559 } 560 561 if (!virtio_gpu_base_device_realize(qdev, NULL, NULL, errp)) { 562 return; 563 } 564 565 g->vhost_gpu_fd = -1; 566} 567 568static Property vhost_user_gpu_properties[] = { 569 VIRTIO_GPU_BASE_PROPERTIES(VhostUserGPU, parent_obj.conf), 570 DEFINE_PROP_END_OF_LIST(), 571}; 572 573static void 574vhost_user_gpu_class_init(ObjectClass *klass, void *data) 575{ 576 DeviceClass *dc = DEVICE_CLASS(klass); 577 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 578 VirtIOGPUBaseClass *vgc = VIRTIO_GPU_BASE_CLASS(klass); 579 580 vgc->gl_flushed = vhost_user_gpu_gl_flushed; 581 582 vdc->realize = vhost_user_gpu_device_realize; 583 vdc->reset = vhost_user_gpu_reset; 584 vdc->set_status = vhost_user_gpu_set_status; 585 vdc->guest_notifier_mask = vhost_user_gpu_guest_notifier_mask; 586 vdc->guest_notifier_pending = vhost_user_gpu_guest_notifier_pending; 587 vdc->get_config = vhost_user_gpu_get_config; 588 vdc->set_config = vhost_user_gpu_set_config; 589 590 device_class_set_props(dc, vhost_user_gpu_properties); 591} 592 593static const TypeInfo vhost_user_gpu_info = { 594 .name = TYPE_VHOST_USER_GPU, 595 .parent = TYPE_VIRTIO_GPU_BASE, 596 .instance_size = sizeof(VhostUserGPU), 597 .instance_init = vhost_user_gpu_instance_init, 598 .instance_finalize = vhost_user_gpu_instance_finalize, 599 .class_init = vhost_user_gpu_class_init, 600}; 601module_obj(TYPE_VHOST_USER_GPU); 602 603static void vhost_user_gpu_register_types(void) 604{ 605 type_register_static(&vhost_user_gpu_info); 606} 607 608type_init(vhost_user_gpu_register_types)