contrib/vhost-user-gpu/vhost-user-gpu.c

   1 /*
   2  * Virtio vhost-user GPU Device
   3  *
   4  * Copyright Red Hat, Inc. 2013-2018
   5  *
   6  * Authors:
   7  *     Dave Airlie <airlied@redhat.com>
   8  *     Gerd Hoffmann <kraxel@redhat.com>
   9  *     Marc-André Lureau <marcandre.lureau@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  */
  14 #include "qemu/osdep.h"
  15 #include "qemu/drm.h"
  16 #include "qapi/error.h"
  17 #include "qemu/sockets.h"
  18
  19 #include <pixman.h>
  20 #include <glib-unix.h>
  21
  22 #include "vugpu.h"
  23 #include "hw/virtio/virtio-gpu-bswap.h"
  24 #include "hw/virtio/virtio-gpu-pixman.h"
  25 #include "virgl.h"
  26 #include "vugbm.h"
  27
  28 enum {
  29     VHOST_USER_GPU_MAX_QUEUES = 2,
  30 };
  31
  32 struct virtio_gpu_simple_resource {
  33     uint32_t resource_id;
  34     uint32_t width;
  35     uint32_t height;
  36     uint32_t format;
  37     struct iovec *iov;
  38     unsigned int iov_cnt;
  39     uint32_t scanout_bitmask;
  40     pixman_image_t *image;
  41     struct vugbm_buffer buffer;
  42     QTAILQ_ENTRY(virtio_gpu_simple_resource) next;
  43 };
  44
  45 static gboolean opt_print_caps;
  46 static int opt_fdnum = -1;
  47 static char *opt_socket_path;
  48 static char *opt_render_node;
  49 static gboolean opt_virgl;
  50
  51 static void vg_handle_ctrl(VuDev *dev, int qidx);
  52
  53 static const char *
  54 vg_cmd_to_string(int cmd)
  55 {
  56 #define CMD(cmd) [cmd] = #cmd
  57     static const char *vg_cmd_str[] = {
  58         CMD(VIRTIO_GPU_UNDEFINED),
  59
  60         /* 2d commands */
  61         CMD(VIRTIO_GPU_CMD_GET_DISPLAY_INFO),
  62         CMD(VIRTIO_GPU_CMD_RESOURCE_CREATE_2D),
  63         CMD(VIRTIO_GPU_CMD_RESOURCE_UNREF),
  64         CMD(VIRTIO_GPU_CMD_SET_SCANOUT),
  65         CMD(VIRTIO_GPU_CMD_RESOURCE_FLUSH),
  66         CMD(VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D),
  67         CMD(VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING),
  68         CMD(VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING),
  69         CMD(VIRTIO_GPU_CMD_GET_CAPSET_INFO),
  70         CMD(VIRTIO_GPU_CMD_GET_CAPSET),
  71
  72         /* 3d commands */
  73         CMD(VIRTIO_GPU_CMD_CTX_CREATE),
  74         CMD(VIRTIO_GPU_CMD_CTX_DESTROY),
  75         CMD(VIRTIO_GPU_CMD_CTX_ATTACH_RESOURCE),
  76         CMD(VIRTIO_GPU_CMD_CTX_DETACH_RESOURCE),
  77         CMD(VIRTIO_GPU_CMD_RESOURCE_CREATE_3D),
  78         CMD(VIRTIO_GPU_CMD_TRANSFER_TO_HOST_3D),
  79         CMD(VIRTIO_GPU_CMD_TRANSFER_FROM_HOST_3D),
  80         CMD(VIRTIO_GPU_CMD_SUBMIT_3D),
  81
  82         /* cursor commands */
  83         CMD(VIRTIO_GPU_CMD_UPDATE_CURSOR),
  84         CMD(VIRTIO_GPU_CMD_MOVE_CURSOR),
  85     };
  86 #undef REQ
  87
  88     if (cmd >= 0 && cmd < G_N_ELEMENTS(vg_cmd_str)) {
  89         return vg_cmd_str[cmd];
  90     } else {
  91         return "unknown";
  92     }
  93 }
  94
  95 static int
  96 vg_sock_fd_read(int sock, void *buf, ssize_t buflen)
  97 {
  98     int ret;
  99
 100     do {
 101         ret = read(sock, buf, buflen);
 102     } while (ret < 0 && (errno == EINTR || errno == EAGAIN));
 103
 104     g_warn_if_fail(ret == buflen);
 105     return ret;
 106 }
 107
 108 static void
 109 vg_sock_fd_close(VuGpu *g)
 110 {
 111     if (g->sock_fd >= 0) {
 112         close(g->sock_fd);
 113         g->sock_fd = -1;
 114     }
 115 }
 116
 117 static gboolean
 118 source_wait_cb(gint fd, GIOCondition condition, gpointer user_data)
 119 {
 120     VuGpu *g = user_data;
 121
 122     if (!vg_recv_msg(g, VHOST_USER_GPU_DMABUF_UPDATE, 0, NULL)) {
 123         return G_SOURCE_CONTINUE;
 124     }
 125
 126     /* resume */
 127     g->wait_in = 0;
 128     vg_handle_ctrl(&g->dev.parent, 0);
 129
 130     return G_SOURCE_REMOVE;
 131 }
 132
 133 void
 134 vg_wait_ok(VuGpu *g)
 135 {
 136     assert(g->wait_in == 0);
 137     g->wait_in = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
 138                                source_wait_cb, g);
 139 }
 140
 141 static int
 142 vg_sock_fd_write(int sock, const void *buf, ssize_t buflen, int fd)
 143 {
 144     ssize_t ret;
 145     struct iovec iov = {
 146         .iov_base = (void *)buf,
 147         .iov_len = buflen,
 148     };
 149     struct msghdr msg = {
 150         .msg_iov = &iov,
 151         .msg_iovlen = 1,
 152     };
 153     union {
 154         struct cmsghdr cmsghdr;
 155         char control[CMSG_SPACE(sizeof(int))];
 156     } cmsgu;
 157     struct cmsghdr *cmsg;
 158
 159     if (fd != -1) {
 160         msg.msg_control = cmsgu.control;
 161         msg.msg_controllen = sizeof(cmsgu.control);
 162
 163         cmsg = CMSG_FIRSTHDR(&msg);
 164         cmsg->cmsg_len = CMSG_LEN(sizeof(int));
 165         cmsg->cmsg_level = SOL_SOCKET;
 166         cmsg->cmsg_type = SCM_RIGHTS;
 167
 168         *((int *)CMSG_DATA(cmsg)) = fd;
 169     }
 170
 171     do {
 172         ret = sendmsg(sock, &msg, 0);
 173     } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
 174
 175     g_warn_if_fail(ret == buflen);
 176     return ret;
 177 }
 178
 179 void
 180 vg_send_msg(VuGpu *vg, const VhostUserGpuMsg *msg, int fd)
 181 {
 182     if (vg_sock_fd_write(vg->sock_fd, msg,
 183                          VHOST_USER_GPU_HDR_SIZE + msg->size, fd) < 0) {
 184         vg_sock_fd_close(vg);
 185     }
 186 }
 187
 188 bool
 189 vg_recv_msg(VuGpu *g, uint32_t expect_req, uint32_t expect_size,
 190             gpointer payload)
 191 {
 192     uint32_t req, flags, size;
 193
 194     if (vg_sock_fd_read(g->sock_fd, &req, sizeof(req)) < 0 ||
 195         vg_sock_fd_read(g->sock_fd, &flags, sizeof(flags)) < 0 ||
 196         vg_sock_fd_read(g->sock_fd, &size, sizeof(size)) < 0) {
 197         goto err;
 198     }
 199
 200     g_return_val_if_fail(req == expect_req, false);
 201     g_return_val_if_fail(flags & VHOST_USER_GPU_MSG_FLAG_REPLY, false);
 202     g_return_val_if_fail(size == expect_size, false);
 203
 204     if (size && vg_sock_fd_read(g->sock_fd, payload, size) != size) {
 205         goto err;
 206     }
 207
 208     return true;
 209
 210 err:
 211     vg_sock_fd_close(g);
 212     return false;
 213 }
 214
 215 static struct virtio_gpu_simple_resource *
 216 virtio_gpu_find_resource(VuGpu *g, uint32_t resource_id)
 217 {
 218     struct virtio_gpu_simple_resource *res;
 219
 220     QTAILQ_FOREACH(res, &g->reslist, next) {
 221         if (res->resource_id == resource_id) {
 222             return res;
 223         }
 224     }
 225     return NULL;
 226 }
 227
 228 void
 229 vg_ctrl_response(VuGpu *g,
 230                  struct virtio_gpu_ctrl_command *cmd,
 231                  struct virtio_gpu_ctrl_hdr *resp,
 232                  size_t resp_len)
 233 {
 234     size_t s;
 235
 236     if (cmd->cmd_hdr.flags & VIRTIO_GPU_FLAG_FENCE) {
 237         resp->flags |= VIRTIO_GPU_FLAG_FENCE;
 238         resp->fence_id = cmd->cmd_hdr.fence_id;
 239         resp->ctx_id = cmd->cmd_hdr.ctx_id;
 240     }
 241     virtio_gpu_ctrl_hdr_bswap(resp);
 242     s = iov_from_buf(cmd->elem.in_sg, cmd->elem.in_num, 0, resp, resp_len);
 243     if (s != resp_len) {
 244         g_critical("%s: response size incorrect %zu vs %zu",
 245                    __func__, s, resp_len);
 246     }
 247     vu_queue_push(&g->dev.parent, cmd->vq, &cmd->elem, s);
 248     vu_queue_notify(&g->dev.parent, cmd->vq);
 249     cmd->state = VG_CMD_STATE_FINISHED;
 250 }
 251
 252 void
 253 vg_ctrl_response_nodata(VuGpu *g,
 254                         struct virtio_gpu_ctrl_command *cmd,
 255                         enum virtio_gpu_ctrl_type type)
 256 {
 257     struct virtio_gpu_ctrl_hdr resp = {
 258         .type = type,
 259     };
 260
 261     vg_ctrl_response(g, cmd, &resp, sizeof(resp));
 262 }
 263
 264
 265 static gboolean
 266 get_display_info_cb(gint fd, GIOCondition condition, gpointer user_data)
 267 {
 268     struct virtio_gpu_resp_display_info dpy_info = { {} };
 269     VuGpu *vg = user_data;
 270     struct virtio_gpu_ctrl_command *cmd = QTAILQ_LAST(&vg->fenceq);
 271
 272     g_debug("disp info cb");
 273     assert(cmd->cmd_hdr.type == VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
 274     if (!vg_recv_msg(vg, VHOST_USER_GPU_GET_DISPLAY_INFO,
 275                      sizeof(dpy_info), &dpy_info)) {
 276         return G_SOURCE_CONTINUE;
 277     }
 278
 279     QTAILQ_REMOVE(&vg->fenceq, cmd, next);
 280     vg_ctrl_response(vg, cmd, &dpy_info.hdr, sizeof(dpy_info));
 281
 282     vg->wait_in = 0;
 283     vg_handle_ctrl(&vg->dev.parent, 0);
 284
 285     return G_SOURCE_REMOVE;
 286 }
 287
 288 void
 289 vg_get_display_info(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd)
 290 {
 291     VhostUserGpuMsg msg = {
 292         .request = VHOST_USER_GPU_GET_DISPLAY_INFO,
 293         .size = 0,
 294     };
 295
 296     assert(vg->wait_in == 0);
 297
 298     vg_send_msg(vg, &msg, -1);
 299     vg->wait_in = g_unix_fd_add(vg->sock_fd, G_IO_IN | G_IO_HUP,
 300                                get_display_info_cb, vg);
 301     cmd->state = VG_CMD_STATE_PENDING;
 302 }
 303
 304 static void
 305 vg_resource_create_2d(VuGpu *g,
 306                       struct virtio_gpu_ctrl_command *cmd)
 307 {
 308     pixman_format_code_t pformat;
 309     struct virtio_gpu_simple_resource *res;
 310     struct virtio_gpu_resource_create_2d c2d;
 311
 312     VUGPU_FILL_CMD(c2d);
 313     virtio_gpu_bswap_32(&c2d, sizeof(c2d));
 314
 315     if (c2d.resource_id == 0) {
 316         g_critical("%s: resource id 0 is not allowed", __func__);
 317         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 318         return;
 319     }
 320
 321     res = virtio_gpu_find_resource(g, c2d.resource_id);
 322     if (res) {
 323         g_critical("%s: resource already exists %d", __func__, c2d.resource_id);
 324         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 325         return;
 326     }
 327
 328     res = g_new0(struct virtio_gpu_simple_resource, 1);
 329     res->width = c2d.width;
 330     res->height = c2d.height;
 331     res->format = c2d.format;
 332     res->resource_id = c2d.resource_id;
 333
 334     pformat = virtio_gpu_get_pixman_format(c2d.format);
 335     if (!pformat) {
 336         g_critical("%s: host couldn't handle guest format %d",
 337                    __func__, c2d.format);
 338         g_free(res);
 339         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
 340         return;
 341     }
 342     vugbm_buffer_create(&res->buffer, &g->gdev, c2d.width, c2d.height);
 343     res->image = pixman_image_create_bits(pformat,
 344                                           c2d.width,
 345                                           c2d.height,
 346                                           (uint32_t *)res->buffer.mmap,
 347                                           res->buffer.stride);
 348     if (!res->image) {
 349         g_critical("%s: resource creation failed %d %d %d",
 350                    __func__, c2d.resource_id, c2d.width, c2d.height);
 351         g_free(res);
 352         cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
 353         return;
 354     }
 355
 356     QTAILQ_INSERT_HEAD(&g->reslist, res, next);
 357 }
 358
 359 static void
 360 vg_disable_scanout(VuGpu *g, int scanout_id)
 361 {
 362     struct virtio_gpu_scanout *scanout = &g->scanout[scanout_id];
 363     struct virtio_gpu_simple_resource *res;
 364
 365     if (scanout->resource_id == 0) {
 366         return;
 367     }
 368
 369     res = virtio_gpu_find_resource(g, scanout->resource_id);
 370     if (res) {
 371         res->scanout_bitmask &= ~(1 << scanout_id);
 372     }
 373
 374     scanout->width = 0;
 375     scanout->height = 0;
 376
 377     if (g->sock_fd >= 0) {
 378         VhostUserGpuMsg msg = {
 379             .request = VHOST_USER_GPU_SCANOUT,
 380             .size = sizeof(VhostUserGpuScanout),
 381             .payload.scanout.scanout_id = scanout_id,
 382         };
 383         vg_send_msg(g, &msg, -1);
 384     }
 385 }
 386
 387 static void
 388 vg_resource_destroy(VuGpu *g,
 389                     struct virtio_gpu_simple_resource *res)
 390 {
 391     int i;
 392
 393     if (res->scanout_bitmask) {
 394         for (i = 0; i < VIRTIO_GPU_MAX_SCANOUTS; i++) {
 395             if (res->scanout_bitmask & (1 << i)) {
 396                 vg_disable_scanout(g, i);
 397             }
 398         }
 399     }
 400
 401     vugbm_buffer_destroy(&res->buffer);
 402     pixman_image_unref(res->image);
 403     QTAILQ_REMOVE(&g->reslist, res, next);
 404     g_free(res);
 405 }
 406
 407 static void
 408 vg_resource_unref(VuGpu *g,
 409                   struct virtio_gpu_ctrl_command *cmd)
 410 {
 411     struct virtio_gpu_simple_resource *res;
 412     struct virtio_gpu_resource_unref unref;
 413
 414     VUGPU_FILL_CMD(unref);
 415     virtio_gpu_bswap_32(&unref, sizeof(unref));
 416
 417     res = virtio_gpu_find_resource(g, unref.resource_id);
 418     if (!res) {
 419         g_critical("%s: illegal resource specified %d",
 420                    __func__, unref.resource_id);
 421         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 422         return;
 423     }
 424     vg_resource_destroy(g, res);
 425 }
 426
 427 int
 428 vg_create_mapping_iov(VuGpu *g,
 429                       struct virtio_gpu_resource_attach_backing *ab,
 430                       struct virtio_gpu_ctrl_command *cmd,
 431                       struct iovec **iov)
 432 {
 433     struct virtio_gpu_mem_entry *ents;
 434     size_t esize, s;
 435     int i;
 436
 437     if (ab->nr_entries > 16384) {
 438         g_critical("%s: nr_entries is too big (%d > 16384)",
 439                    __func__, ab->nr_entries);
 440         return -1;
 441     }
 442
 443     esize = sizeof(*ents) * ab->nr_entries;
 444     ents = g_malloc(esize);
 445     s = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num,
 446                    sizeof(*ab), ents, esize);
 447     if (s != esize) {
 448         g_critical("%s: command data size incorrect %zu vs %zu",
 449                    __func__, s, esize);
 450         g_free(ents);
 451         return -1;
 452     }
 453
 454     *iov = g_malloc0(sizeof(struct iovec) * ab->nr_entries);
 455     for (i = 0; i < ab->nr_entries; i++) {
 456         uint64_t len = ents[i].length;
 457         (*iov)[i].iov_len = ents[i].length;
 458         (*iov)[i].iov_base = vu_gpa_to_va(&g->dev.parent, &len, ents[i].addr);
 459         if (!(*iov)[i].iov_base || len != ents[i].length) {
 460             g_critical("%s: resource %d element %d",
 461                        __func__, ab->resource_id, i);
 462             g_free(*iov);
 463             g_free(ents);
 464             *iov = NULL;
 465             return -1;
 466         }
 467     }
 468     g_free(ents);
 469     return 0;
 470 }
 471
 472 static void
 473 vg_resource_attach_backing(VuGpu *g,
 474                            struct virtio_gpu_ctrl_command *cmd)
 475 {
 476     struct virtio_gpu_simple_resource *res;
 477     struct virtio_gpu_resource_attach_backing ab;
 478     int ret;
 479
 480     VUGPU_FILL_CMD(ab);
 481     virtio_gpu_bswap_32(&ab, sizeof(ab));
 482
 483     res = virtio_gpu_find_resource(g, ab.resource_id);
 484     if (!res) {
 485         g_critical("%s: illegal resource specified %d",
 486                    __func__, ab.resource_id);
 487         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 488         return;
 489     }
 490
 491     ret = vg_create_mapping_iov(g, &ab, cmd, &res->iov);
 492     if (ret != 0) {
 493         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
 494         return;
 495     }
 496
 497     res->iov_cnt = ab.nr_entries;
 498 }
 499
 500 static void
 501 vg_resource_detach_backing(VuGpu *g,
 502                            struct virtio_gpu_ctrl_command *cmd)
 503 {
 504     struct virtio_gpu_simple_resource *res;
 505     struct virtio_gpu_resource_detach_backing detach;
 506
 507     VUGPU_FILL_CMD(detach);
 508     virtio_gpu_bswap_32(&detach, sizeof(detach));
 509
 510     res = virtio_gpu_find_resource(g, detach.resource_id);
 511     if (!res || !res->iov) {
 512         g_critical("%s: illegal resource specified %d",
 513                    __func__, detach.resource_id);
 514         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 515         return;
 516     }
 517
 518     g_free(res->iov);
 519     res->iov = NULL;
 520     res->iov_cnt = 0;
 521 }
 522
 523 static void
 524 vg_transfer_to_host_2d(VuGpu *g,
 525                        struct virtio_gpu_ctrl_command *cmd)
 526 {
 527     struct virtio_gpu_simple_resource *res;
 528     int h;
 529     uint32_t src_offset, dst_offset, stride;
 530     int bpp;
 531     pixman_format_code_t format;
 532     struct virtio_gpu_transfer_to_host_2d t2d;
 533
 534     VUGPU_FILL_CMD(t2d);
 535     virtio_gpu_t2d_bswap(&t2d);
 536
 537     res = virtio_gpu_find_resource(g, t2d.resource_id);
 538     if (!res || !res->iov) {
 539         g_critical("%s: illegal resource specified %d",
 540                    __func__, t2d.resource_id);
 541         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 542         return;
 543     }
 544
 545     if (t2d.r.x > res->width ||
 546         t2d.r.y > res->height ||
 547         t2d.r.width > res->width ||
 548         t2d.r.height > res->height ||
 549         t2d.r.x + t2d.r.width > res->width ||
 550         t2d.r.y + t2d.r.height > res->height) {
 551         g_critical("%s: transfer bounds outside resource"
 552                    " bounds for resource %d: %d %d %d %d vs %d %d",
 553                    __func__, t2d.resource_id, t2d.r.x, t2d.r.y,
 554                    t2d.r.width, t2d.r.height, res->width, res->height);
 555         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
 556         return;
 557     }
 558
 559     format = pixman_image_get_format(res->image);
 560     bpp = (PIXMAN_FORMAT_BPP(format) + 7) / 8;
 561     stride = pixman_image_get_stride(res->image);
 562
 563     if (t2d.offset || t2d.r.x || t2d.r.y ||
 564         t2d.r.width != pixman_image_get_width(res->image)) {
 565         void *img_data = pixman_image_get_data(res->image);
 566         for (h = 0; h < t2d.r.height; h++) {
 567             src_offset = t2d.offset + stride * h;
 568             dst_offset = (t2d.r.y + h) * stride + (t2d.r.x * bpp);
 569
 570             iov_to_buf(res->iov, res->iov_cnt, src_offset,
 571                        img_data
 572                        + dst_offset, t2d.r.width * bpp);
 573         }
 574     } else {
 575         iov_to_buf(res->iov, res->iov_cnt, 0,
 576                    pixman_image_get_data(res->image),
 577                    pixman_image_get_stride(res->image)
 578                    * pixman_image_get_height(res->image));
 579     }
 580 }
 581
 582 static void
 583 vg_set_scanout(VuGpu *g,
 584                struct virtio_gpu_ctrl_command *cmd)
 585 {
 586     struct virtio_gpu_simple_resource *res, *ores;
 587     struct virtio_gpu_scanout *scanout;
 588     struct virtio_gpu_set_scanout ss;
 589     int fd;
 590
 591     VUGPU_FILL_CMD(ss);
 592     virtio_gpu_bswap_32(&ss, sizeof(ss));
 593
 594     if (ss.scanout_id >= VIRTIO_GPU_MAX_SCANOUTS) {
 595         g_critical("%s: illegal scanout id specified %d",
 596                    __func__, ss.scanout_id);
 597         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID;
 598         return;
 599     }
 600
 601     if (ss.resource_id == 0) {
 602         vg_disable_scanout(g, ss.scanout_id);
 603         return;
 604     }
 605
 606     /* create a surface for this scanout */
 607     res = virtio_gpu_find_resource(g, ss.resource_id);
 608     if (!res) {
 609         g_critical("%s: illegal resource specified %d",
 610                       __func__, ss.resource_id);
 611         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 612         return;
 613     }
 614
 615     if (ss.r.x > res->width ||
 616         ss.r.y > res->height ||
 617         ss.r.width > res->width ||
 618         ss.r.height > res->height ||
 619         ss.r.x + ss.r.width > res->width ||
 620         ss.r.y + ss.r.height > res->height) {
 621         g_critical("%s: illegal scanout %d bounds for"
 622                    " resource %d, (%d,%d)+%d,%d vs %d %d",
 623                    __func__, ss.scanout_id, ss.resource_id, ss.r.x, ss.r.y,
 624                    ss.r.width, ss.r.height, res->width, res->height);
 625         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
 626         return;
 627     }
 628
 629     scanout = &g->scanout[ss.scanout_id];
 630
 631     ores = virtio_gpu_find_resource(g, scanout->resource_id);
 632     if (ores) {
 633         ores->scanout_bitmask &= ~(1 << ss.scanout_id);
 634     }
 635
 636     res->scanout_bitmask |= (1 << ss.scanout_id);
 637     scanout->resource_id = ss.resource_id;
 638     scanout->x = ss.r.x;
 639     scanout->y = ss.r.y;
 640     scanout->width = ss.r.width;
 641     scanout->height = ss.r.height;
 642
 643     struct vugbm_buffer *buffer = &res->buffer;
 644
 645     if (vugbm_buffer_can_get_dmabuf_fd(buffer)) {
 646         VhostUserGpuMsg msg = {
 647             .request = VHOST_USER_GPU_DMABUF_SCANOUT,
 648             .size = sizeof(VhostUserGpuDMABUFScanout),
 649             .payload.dmabuf_scanout = (VhostUserGpuDMABUFScanout) {
 650                 .scanout_id = ss.scanout_id,
 651                 .x = ss.r.x,
 652                 .y = ss.r.y,
 653                 .width = ss.r.width,
 654                 .height = ss.r.height,
 655                 .fd_width = buffer->width,
 656                 .fd_height = buffer->height,
 657                 .fd_stride = buffer->stride,
 658                 .fd_drm_fourcc = buffer->format
 659             }
 660         };
 661
 662         if (vugbm_buffer_get_dmabuf_fd(buffer, &fd)) {
 663             vg_send_msg(g, &msg, fd);
 664             close(fd);
 665         }
 666     } else {
 667         VhostUserGpuMsg msg = {
 668             .request = VHOST_USER_GPU_SCANOUT,
 669             .size = sizeof(VhostUserGpuScanout),
 670             .payload.scanout = (VhostUserGpuScanout) {
 671                 .scanout_id = ss.scanout_id,
 672                 .width = scanout->width,
 673                 .height = scanout->height
 674             }
 675         };
 676         vg_send_msg(g, &msg, -1);
 677     }
 678 }
 679
 680 static void
 681 vg_resource_flush(VuGpu *g,
 682                   struct virtio_gpu_ctrl_command *cmd)
 683 {
 684     struct virtio_gpu_simple_resource *res;
 685     struct virtio_gpu_resource_flush rf;
 686     pixman_region16_t flush_region;
 687     int i;
 688
 689     VUGPU_FILL_CMD(rf);
 690     virtio_gpu_bswap_32(&rf, sizeof(rf));
 691
 692     res = virtio_gpu_find_resource(g, rf.resource_id);
 693     if (!res) {
 694         g_critical("%s: illegal resource specified %d\n",
 695                    __func__, rf.resource_id);
 696         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
 697         return;
 698     }
 699
 700     if (rf.r.x > res->width ||
 701         rf.r.y > res->height ||
 702         rf.r.width > res->width ||
 703         rf.r.height > res->height ||
 704         rf.r.x + rf.r.width > res->width ||
 705         rf.r.y + rf.r.height > res->height) {
 706         g_critical("%s: flush bounds outside resource"
 707                    " bounds for resource %d: %d %d %d %d vs %d %d\n",
 708                    __func__, rf.resource_id, rf.r.x, rf.r.y,
 709                    rf.r.width, rf.r.height, res->width, res->height);
 710         cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
 711         return;
 712     }
 713
 714     pixman_region_init_rect(&flush_region,
 715                             rf.r.x, rf.r.y, rf.r.width, rf.r.height);
 716     for (i = 0; i < VIRTIO_GPU_MAX_SCANOUTS; i++) {
 717         struct virtio_gpu_scanout *scanout;
 718         pixman_region16_t region, finalregion;
 719         pixman_box16_t *extents;
 720
 721         if (!(res->scanout_bitmask & (1 << i))) {
 722             continue;
 723         }
 724         scanout = &g->scanout[i];
 725
 726         pixman_region_init(&finalregion);
 727         pixman_region_init_rect(&region, scanout->x, scanout->y,
 728                                 scanout->width, scanout->height);
 729
 730         pixman_region_intersect(&finalregion, &flush_region, &region);
 731
 732         extents = pixman_region_extents(&finalregion);
 733         size_t width = extents->x2 - extents->x1;
 734         size_t height = extents->y2 - extents->y1;
 735
 736         if (vugbm_buffer_can_get_dmabuf_fd(&res->buffer)) {
 737             VhostUserGpuMsg vmsg = {
 738                 .request = VHOST_USER_GPU_DMABUF_UPDATE,
 739                 .size = sizeof(VhostUserGpuUpdate),
 740                 .payload.update = (VhostUserGpuUpdate) {
 741                     .scanout_id = i,
 742                     .x = extents->x1,
 743                     .y = extents->y1,
 744                     .width = width,
 745                     .height = height,
 746                 }
 747             };
 748             vg_send_msg(g, &vmsg, -1);
 749             vg_wait_ok(g);
 750         } else {
 751             size_t bpp =
 752                 PIXMAN_FORMAT_BPP(pixman_image_get_format(res->image)) / 8;
 753             size_t size = width * height * bpp;
 754
 755             void *p = g_malloc(VHOST_USER_GPU_HDR_SIZE +
 756                                sizeof(VhostUserGpuUpdate) + size);
 757             VhostUserGpuMsg *msg = p;
 758             msg->request = VHOST_USER_GPU_UPDATE;
 759             msg->size = sizeof(VhostUserGpuUpdate) + size;
 760             msg->payload.update = (VhostUserGpuUpdate) {
 761                 .scanout_id = i,
 762                 .x = extents->x1,
 763                 .y = extents->y1,
 764                 .width = width,
 765                 .height = height,
 766             };
 767             pixman_image_t *i =
 768                 pixman_image_create_bits(pixman_image_get_format(res->image),
 769                                          msg->payload.update.width,
 770                                          msg->payload.update.height,
 771                                          p + offsetof(VhostUserGpuMsg,
 772                                                       payload.update.data),
 773                                          width * bpp);
 774             pixman_image_composite(PIXMAN_OP_SRC,
 775                                    res->image, NULL, i,
 776                                    extents->x1, extents->y1,
 777                                    0, 0, 0, 0,
 778                                    width, height);
 779             pixman_image_unref(i);
 780             vg_send_msg(g, msg, -1);
 781             g_free(msg);
 782         }
 783         pixman_region_fini(&region);
 784         pixman_region_fini(&finalregion);
 785     }
 786     pixman_region_fini(&flush_region);
 787 }
 788
 789 static void
 790 vg_process_cmd(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd)
 791 {
 792     switch (cmd->cmd_hdr.type) {
 793     case VIRTIO_GPU_CMD_GET_DISPLAY_INFO:
 794         vg_get_display_info(vg, cmd);
 795         break;
 796     case VIRTIO_GPU_CMD_RESOURCE_CREATE_2D:
 797         vg_resource_create_2d(vg, cmd);
 798         break;
 799     case VIRTIO_GPU_CMD_RESOURCE_UNREF:
 800         vg_resource_unref(vg, cmd);
 801         break;
 802     case VIRTIO_GPU_CMD_RESOURCE_FLUSH:
 803         vg_resource_flush(vg, cmd);
 804         break;
 805     case VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D:
 806         vg_transfer_to_host_2d(vg, cmd);
 807         break;
 808     case VIRTIO_GPU_CMD_SET_SCANOUT:
 809         vg_set_scanout(vg, cmd);
 810         break;
 811     case VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING:
 812         vg_resource_attach_backing(vg, cmd);
 813         break;
 814     case VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING:
 815         vg_resource_detach_backing(vg, cmd);
 816         break;
 817     /* case VIRTIO_GPU_CMD_GET_EDID: */
 818     /*     break */
 819     default:
 820         g_warning("TODO handle ctrl %x\n", cmd->cmd_hdr.type);
 821         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
 822         break;
 823     }
 824     if (cmd->state == VG_CMD_STATE_NEW) {
 825         vg_ctrl_response_nodata(vg, cmd, cmd->error ? cmd->error :
 826                                 VIRTIO_GPU_RESP_OK_NODATA);
 827     }
 828 }
 829
 830 static void
 831 vg_handle_ctrl(VuDev *dev, int qidx)
 832 {
 833     VuGpu *vg = container_of(dev, VuGpu, dev.parent);
 834     VuVirtq *vq = vu_get_queue(dev, qidx);
 835     struct virtio_gpu_ctrl_command *cmd = NULL;
 836     size_t len;
 837
 838     for (;;) {
 839         if (vg->wait_in != 0) {
 840             return;
 841         }
 842
 843         cmd = vu_queue_pop(dev, vq, sizeof(struct virtio_gpu_ctrl_command));
 844         if (!cmd) {
 845             break;
 846         }
 847         cmd->vq = vq;
 848         cmd->error = 0;
 849         cmd->state = VG_CMD_STATE_NEW;
 850
 851         len = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num,
 852                          0, &cmd->cmd_hdr, sizeof(cmd->cmd_hdr));
 853         if (len != sizeof(cmd->cmd_hdr)) {
 854             g_warning("%s: command size incorrect %zu vs %zu\n",
 855                       __func__, len, sizeof(cmd->cmd_hdr));
 856         }
 857
 858         virtio_gpu_ctrl_hdr_bswap(&cmd->cmd_hdr);
 859         g_debug("%d %s\n", cmd->cmd_hdr.type,
 860                 vg_cmd_to_string(cmd->cmd_hdr.type));
 861
 862         if (vg->virgl) {
 863             vg_virgl_process_cmd(vg, cmd);
 864         } else {
 865             vg_process_cmd(vg, cmd);
 866         }
 867
 868         if (cmd->state != VG_CMD_STATE_FINISHED) {
 869             QTAILQ_INSERT_TAIL(&vg->fenceq, cmd, next);
 870             vg->inflight++;
 871         } else {
 872             free(cmd);
 873         }
 874     }
 875 }
 876
 877 static void
 878 update_cursor_data_simple(VuGpu *g, uint32_t resource_id, gpointer data)
 879 {
 880     struct virtio_gpu_simple_resource *res;
 881
 882     res = virtio_gpu_find_resource(g, resource_id);
 883     g_return_if_fail(res != NULL);
 884     g_return_if_fail(pixman_image_get_width(res->image) == 64);
 885     g_return_if_fail(pixman_image_get_height(res->image) == 64);
 886     g_return_if_fail(
 887         PIXMAN_FORMAT_BPP(pixman_image_get_format(res->image)) == 32);
 888
 889     memcpy(data, pixman_image_get_data(res->image), 64 * 64 * sizeof(uint32_t));
 890 }
 891
 892 static void
 893 vg_process_cursor_cmd(VuGpu *g, struct virtio_gpu_update_cursor *cursor)
 894 {
 895     bool move = cursor->hdr.type != VIRTIO_GPU_CMD_MOVE_CURSOR;
 896
 897     g_debug("%s move:%d\n", G_STRFUNC, move);
 898
 899     if (move) {
 900         VhostUserGpuMsg msg = {
 901             .request = cursor->resource_id ?
 902                 VHOST_USER_GPU_CURSOR_POS : VHOST_USER_GPU_CURSOR_POS_HIDE,
 903             .size = sizeof(VhostUserGpuCursorPos),
 904             .payload.cursor_pos = {
 905                 .scanout_id = cursor->pos.scanout_id,
 906                 .x = cursor->pos.x,
 907                 .y = cursor->pos.y,
 908             }
 909         };
 910         vg_send_msg(g, &msg, -1);
 911     } else {
 912         VhostUserGpuMsg msg = {
 913             .request = VHOST_USER_GPU_CURSOR_UPDATE,
 914             .size = sizeof(VhostUserGpuCursorUpdate),
 915             .payload.cursor_update = {
 916                 .pos = {
 917                     .scanout_id = cursor->pos.scanout_id,
 918                     .x = cursor->pos.x,
 919                     .y = cursor->pos.y,
 920                 },
 921                 .hot_x = cursor->hot_x,
 922                 .hot_y = cursor->hot_y,
 923             }
 924         };
 925         if (g->virgl) {
 926             vg_virgl_update_cursor_data(g, cursor->resource_id,
 927                                         msg.payload.cursor_update.data);
 928         } else {
 929             update_cursor_data_simple(g, cursor->resource_id,
 930                                       msg.payload.cursor_update.data);
 931         }
 932         vg_send_msg(g, &msg, -1);
 933     }
 934 }
 935
 936 static void
 937 vg_handle_cursor(VuDev *dev, int qidx)
 938 {
 939     VuGpu *g = container_of(dev, VuGpu, dev.parent);
 940     VuVirtq *vq = vu_get_queue(dev, qidx);
 941     VuVirtqElement *elem;
 942     size_t len;
 943     struct virtio_gpu_update_cursor cursor;
 944
 945     for (;;) {
 946         elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
 947         if (!elem) {
 948             break;
 949         }
 950         g_debug("cursor out:%d in:%d\n", elem->out_num, elem->in_num);
 951
 952         len = iov_to_buf(elem->out_sg, elem->out_num,
 953                          0, &cursor, sizeof(cursor));
 954         if (len != sizeof(cursor)) {
 955             g_warning("%s: cursor size incorrect %zu vs %zu\n",
 956                       __func__, len, sizeof(cursor));
 957         } else {
 958             virtio_gpu_bswap_32(&cursor, sizeof(cursor));
 959             vg_process_cursor_cmd(g, &cursor);
 960         }
 961         vu_queue_push(dev, vq, elem, 0);
 962         vu_queue_notify(dev, vq);
 963         free(elem);
 964     }
 965 }
 966
 967 static void
 968 vg_panic(VuDev *dev, const char *msg)
 969 {
 970     g_critical("%s\n", msg);
 971     exit(1);
 972 }
 973
 974 static void
 975 vg_queue_set_started(VuDev *dev, int qidx, bool started)
 976 {
 977     VuVirtq *vq = vu_get_queue(dev, qidx);
 978
 979     g_debug("queue started %d:%d\n", qidx, started);
 980
 981     switch (qidx) {
 982     case 0:
 983         vu_set_queue_handler(dev, vq, started ? vg_handle_ctrl : NULL);
 984         break;
 985     case 1:
 986         vu_set_queue_handler(dev, vq, started ? vg_handle_cursor : NULL);
 987         break;
 988     default:
 989         break;
 990     }
 991 }
 992
 993 static gboolean
 994 protocol_features_cb(gint fd, GIOCondition condition, gpointer user_data)
 995 {
 996     VuGpu *g = user_data;
 997     uint64_t u64;
 998     VhostUserGpuMsg msg = {
 999         .request = VHOST_USER_GPU_GET_PROTOCOL_FEATURES
1000     };
1001
1002     if (!vg_recv_msg(g, msg.request, sizeof(u64), &u64)) {
1003         return G_SOURCE_CONTINUE;
1004     }
1005
1006     msg = (VhostUserGpuMsg) {
1007         .request = VHOST_USER_GPU_SET_PROTOCOL_FEATURES,
1008         .size = sizeof(uint64_t),
1009         .payload.u64 = 0
1010     };
1011     vg_send_msg(g, &msg, -1);
1012
1013     g->wait_in = 0;
1014     vg_handle_ctrl(&g->dev.parent, 0);
1015
1016     return G_SOURCE_REMOVE;
1017 }
1018
1019 static void
1020 set_gpu_protocol_features(VuGpu *g)
1021 {
1022     VhostUserGpuMsg msg = {
1023         .request = VHOST_USER_GPU_GET_PROTOCOL_FEATURES
1024     };
1025
1026     vg_send_msg(g, &msg, -1);
1027     assert(g->wait_in == 0);
1028     g->wait_in = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
1029                                protocol_features_cb, g);
1030 }
1031
1032 static int
1033 vg_process_msg(VuDev *dev, VhostUserMsg *msg, int *do_reply)
1034 {
1035     VuGpu *g = container_of(dev, VuGpu, dev.parent);
1036
1037     switch (msg->request) {
1038     case VHOST_USER_GPU_SET_SOCKET: {
1039         g_return_val_if_fail(msg->fd_num == 1, 1);
1040         g_return_val_if_fail(g->sock_fd == -1, 1);
1041         g->sock_fd = msg->fds[0];
1042         set_gpu_protocol_features(g);
1043         return 1;
1044     }
1045     default:
1046         return 0;
1047     }
1048
1049     return 0;
1050 }
1051
1052 static uint64_t
1053 vg_get_features(VuDev *dev)
1054 {
1055     uint64_t features = 0;
1056
1057     if (opt_virgl) {
1058         features |= 1 << VIRTIO_GPU_F_VIRGL;
1059     }
1060
1061     return features;
1062 }
1063
1064 static void
1065 vg_set_features(VuDev *dev, uint64_t features)
1066 {
1067     VuGpu *g = container_of(dev, VuGpu, dev.parent);
1068     bool virgl = features & (1 << VIRTIO_GPU_F_VIRGL);
1069
1070     if (virgl && !g->virgl_inited) {
1071         if (!vg_virgl_init(g)) {
1072             vg_panic(dev, "Failed to initialize virgl");
1073         }
1074         g->virgl_inited = true;
1075     }
1076
1077     g->virgl = virgl;
1078 }
1079
1080 static int
1081 vg_get_config(VuDev *dev, uint8_t *config, uint32_t len)
1082 {
1083     VuGpu *g = container_of(dev, VuGpu, dev.parent);
1084
1085     if (len > sizeof(struct virtio_gpu_config)) {
1086         return -1;
1087     }
1088
1089     if (opt_virgl) {
1090         g->virtio_config.num_capsets = vg_virgl_get_num_capsets();
1091     }
1092
1093     memcpy(config, &g->virtio_config, len);
1094
1095     return 0;
1096 }
1097
1098 static int
1099 vg_set_config(VuDev *dev, const uint8_t *data,
1100               uint32_t offset, uint32_t size,
1101               uint32_t flags)
1102 {
1103     VuGpu *g = container_of(dev, VuGpu, dev.parent);
1104     struct virtio_gpu_config *config = (struct virtio_gpu_config *)data;
1105
1106     if (config->events_clear) {
1107         g->virtio_config.events_read &= ~config->events_clear;
1108     }
1109
1110     return 0;
1111 }
1112
1113 static const VuDevIface vuiface = {
1114     .set_features = vg_set_features,
1115     .get_features = vg_get_features,
1116     .queue_set_started = vg_queue_set_started,
1117     .process_msg = vg_process_msg,
1118     .get_config = vg_get_config,
1119     .set_config = vg_set_config,
1120 };
1121
1122 static void
1123 vg_destroy(VuGpu *g)
1124 {
1125     struct virtio_gpu_simple_resource *res, *tmp;
1126
1127     vug_deinit(&g->dev);
1128
1129     vg_sock_fd_close(g);
1130
1131     QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
1132         vg_resource_destroy(g, res);
1133     }
1134
1135     vugbm_device_destroy(&g->gdev);
1136 }
1137
1138 static GOptionEntry entries[] = {
1139     { "print-capabilities", 'c', 0, G_OPTION_ARG_NONE, &opt_print_caps,
1140       "Print capabilities", NULL },
1141     { "fd", 'f', 0, G_OPTION_ARG_INT, &opt_fdnum,
1142       "Use inherited fd socket", "FDNUM" },
1143     { "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &opt_socket_path,
1144       "Use UNIX socket path", "PATH" },
1145     { "render-node", 'r', 0, G_OPTION_ARG_FILENAME, &opt_render_node,
1146       "Specify DRM render node", "PATH" },
1147     { "virgl", 'v', 0, G_OPTION_ARG_NONE, &opt_virgl,
1148       "Turn virgl rendering on", NULL },
1149     { NULL, }
1150 };
1151
1152 int
1153 main(int argc, char *argv[])
1154 {
1155     GOptionContext *context;
1156     GError *error = NULL;
1157     GMainLoop *loop = NULL;
1158     int fd;
1159     VuGpu g = { .sock_fd = -1, .drm_rnode_fd = -1 };
1160
1161     QTAILQ_INIT(&g.reslist);
1162     QTAILQ_INIT(&g.fenceq);
1163
1164     context = g_option_context_new("QEMU vhost-user-gpu");
1165     g_option_context_add_main_entries(context, entries, NULL);
1166     if (!g_option_context_parse(context, &argc, &argv, &error)) {
1167         g_printerr("Option parsing failed: %s\n", error->message);
1168         exit(EXIT_FAILURE);
1169     }
1170     g_option_context_free(context);
1171
1172     if (opt_print_caps) {
1173         g_print("{\n");
1174         g_print("  \"type\": \"gpu\",\n");
1175         g_print("  \"features\": [\n");
1176         g_print("    \"render-node\",\n");
1177         g_print("    \"virgl\"\n");
1178         g_print("  ]\n");
1179         g_print("}\n");
1180         exit(EXIT_SUCCESS);
1181     }
1182
1183     g.drm_rnode_fd = qemu_drm_rendernode_open(opt_render_node);
1184     if (opt_render_node && g.drm_rnode_fd == -1) {
1185         g_printerr("Failed to open DRM rendernode.\n");
1186         exit(EXIT_FAILURE);
1187     }
1188
1189     if (g.drm_rnode_fd >= 0) {
1190         if (!vugbm_device_init(&g.gdev, g.drm_rnode_fd)) {
1191             g_warning("Failed to init DRM device, using fallback path");
1192         }
1193     }
1194
1195     if ((!!opt_socket_path + (opt_fdnum != -1)) != 1) {
1196         g_printerr("Please specify either --fd or --socket-path\n");
1197         exit(EXIT_FAILURE);
1198     }
1199
1200     if (opt_socket_path) {
1201         int lsock = unix_listen(opt_socket_path, &error_fatal);
1202         if (lsock < 0) {
1203             g_printerr("Failed to listen on %s.\n", opt_socket_path);
1204             exit(EXIT_FAILURE);
1205         }
1206         fd = accept(lsock, NULL, NULL);
1207         close(lsock);
1208     } else {
1209         fd = opt_fdnum;
1210     }
1211     if (fd == -1) {
1212         g_printerr("Invalid vhost-user socket.\n");
1213         exit(EXIT_FAILURE);
1214     }
1215
1216     if (!vug_init(&g.dev, VHOST_USER_GPU_MAX_QUEUES, fd, vg_panic, &vuiface)) {
1217         g_printerr("Failed to initialize libvhost-user-glib.\n");
1218         exit(EXIT_FAILURE);
1219     }
1220
1221     loop = g_main_loop_new(NULL, FALSE);
1222     g_main_loop_run(loop);
1223     g_main_loop_unref(loop);
1224
1225     vg_destroy(&g);
1226     if (g.drm_rnode_fd >= 0) {
1227         close(g.drm_rnode_fd);
1228     }
1229
1230     return 0;
1231 }