drivers/gpu/drm/vmwgfx/vmwgfx_cmd.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2009-2023 VMware, Inc., Palo Alto, CA., USA
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 #include "vmwgfx_bo.h"
  28 #include "vmwgfx_drv.h"
  29 #include "vmwgfx_devcaps.h"
  30
  31 #include <drm/ttm/ttm_placement.h>
  32
  33 #include <linux/sched/signal.h>
  34
  35 bool vmw_supports_3d(struct vmw_private *dev_priv)
  36 {
  37         uint32_t fifo_min, hwversion;
  38         const struct vmw_fifo_state *fifo = dev_priv->fifo;
  39
  40         if (!(dev_priv->capabilities & SVGA_CAP_3D))
  41                 return false;
  42
  43         if (dev_priv->capabilities & SVGA_CAP_GBOBJECTS) {
  44                 uint32_t result;
  45
  46                 if (!dev_priv->has_mob)
  47                         return false;
  48
  49                 result = vmw_devcap_get(dev_priv, SVGA3D_DEVCAP_3D);
  50
  51                 return (result != 0);
  52         }
  53
  54         if (!(dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO))
  55                 return false;
  56
  57         BUG_ON(vmw_is_svga_v3(dev_priv));
  58
  59         fifo_min = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MIN);
  60         if (fifo_min <= SVGA_FIFO_3D_HWVERSION * sizeof(unsigned int))
  61                 return false;
  62
  63         hwversion = vmw_fifo_mem_read(dev_priv,
  64                                       ((fifo->capabilities &
  65                                         SVGA_FIFO_CAP_3D_HWVERSION_REVISED) ?
  66                                                SVGA_FIFO_3D_HWVERSION_REVISED :
  67                                                SVGA_FIFO_3D_HWVERSION));
  68
  69         if (hwversion == 0)
  70                 return false;
  71
  72         if (hwversion < SVGA3D_HWVERSION_WS8_B1)
  73                 return false;
  74
  75         /* Legacy Display Unit does not support surfaces */
  76         if (dev_priv->active_display_unit == vmw_du_legacy)
  77                 return false;
  78
  79         return true;
  80 }
  81
  82 bool vmw_fifo_have_pitchlock(struct vmw_private *dev_priv)
  83 {
  84         uint32_t caps;
  85
  86         if (!(dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO))
  87                 return false;
  88
  89         caps = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_CAPABILITIES);
  90         if (caps & SVGA_FIFO_CAP_PITCHLOCK)
  91                 return true;
  92
  93         return false;
  94 }
  95
  96 struct vmw_fifo_state *vmw_fifo_create(struct vmw_private *dev_priv)
  97 {
  98         struct vmw_fifo_state *fifo;
  99         uint32_t max;
 100         uint32_t min;
 101
 102         if (!dev_priv->fifo_mem)
 103                 return NULL;
 104
 105         fifo = kzalloc(sizeof(*fifo), GFP_KERNEL);
 106         if (!fifo)
 107                 return ERR_PTR(-ENOMEM);
 108         fifo->static_buffer_size = VMWGFX_FIFO_STATIC_SIZE;
 109         fifo->static_buffer = vmalloc(fifo->static_buffer_size);
 110         if (unlikely(fifo->static_buffer == NULL)) {
 111                 kfree(fifo);
 112                 return ERR_PTR(-ENOMEM);
 113         }
 114
 115         fifo->dynamic_buffer = NULL;
 116         fifo->reserved_size = 0;
 117         fifo->using_bounce_buffer = false;
 118
 119         mutex_init(&fifo->fifo_mutex);
 120         init_rwsem(&fifo->rwsem);
 121         min = 4;
 122         if (dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO)
 123                 min = vmw_read(dev_priv, SVGA_REG_MEM_REGS);
 124         min <<= 2;
 125
 126         if (min < PAGE_SIZE)
 127                 min = PAGE_SIZE;
 128
 129         vmw_fifo_mem_write(dev_priv, SVGA_FIFO_MIN, min);
 130         vmw_fifo_mem_write(dev_priv, SVGA_FIFO_MAX, dev_priv->fifo_mem_size);
 131         wmb();
 132         vmw_fifo_mem_write(dev_priv, SVGA_FIFO_NEXT_CMD, min);
 133         vmw_fifo_mem_write(dev_priv, SVGA_FIFO_STOP, min);
 134         vmw_fifo_mem_write(dev_priv, SVGA_FIFO_BUSY, 0);
 135         mb();
 136
 137         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE, 1);
 138
 139         max = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MAX);
 140         min = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MIN);
 141         fifo->capabilities = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_CAPABILITIES);
 142
 143         drm_info(&dev_priv->drm,
 144                  "Fifo max 0x%08x min 0x%08x cap 0x%08x\n",
 145                  (unsigned int) max,
 146                  (unsigned int) min,
 147                  (unsigned int) fifo->capabilities);
 148
 149         if (unlikely(min >= max)) {
 150                 drm_warn(&dev_priv->drm,
 151                          "FIFO memory is not usable. Driver failed to initialize.");
 152                 return ERR_PTR(-ENXIO);
 153         }
 154
 155         return fifo;
 156 }
 157
 158 void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason)
 159 {
 160         u32 *fifo_mem = dev_priv->fifo_mem;
 161         if (fifo_mem && cmpxchg(fifo_mem + SVGA_FIFO_BUSY, 0, 1) == 0)
 162                 vmw_write(dev_priv, SVGA_REG_SYNC, reason);
 163
 164 }
 165
 166 void vmw_fifo_destroy(struct vmw_private *dev_priv)
 167 {
 168         struct vmw_fifo_state *fifo = dev_priv->fifo;
 169
 170         if (!fifo)
 171                 return;
 172
 173         if (likely(fifo->static_buffer != NULL)) {
 174                 vfree(fifo->static_buffer);
 175                 fifo->static_buffer = NULL;
 176         }
 177
 178         if (likely(fifo->dynamic_buffer != NULL)) {
 179                 vfree(fifo->dynamic_buffer);
 180                 fifo->dynamic_buffer = NULL;
 181         }
 182         kfree(fifo);
 183         dev_priv->fifo = NULL;
 184 }
 185
 186 static bool vmw_fifo_is_full(struct vmw_private *dev_priv, uint32_t bytes)
 187 {
 188         uint32_t max = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MAX);
 189         uint32_t next_cmd = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_NEXT_CMD);
 190         uint32_t min = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MIN);
 191         uint32_t stop = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_STOP);
 192
 193         return ((max - next_cmd) + (stop - min) <= bytes);
 194 }
 195
 196 static int vmw_fifo_wait_noirq(struct vmw_private *dev_priv,
 197                                uint32_t bytes, bool interruptible,
 198                                unsigned long timeout)
 199 {
 200         int ret = 0;
 201         unsigned long end_jiffies = jiffies + timeout;
 202         DEFINE_WAIT(__wait);
 203
 204         DRM_INFO("Fifo wait noirq.\n");
 205
 206         for (;;) {
 207                 prepare_to_wait(&dev_priv->fifo_queue, &__wait,
 208                                 (interruptible) ?
 209                                 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 210                 if (!vmw_fifo_is_full(dev_priv, bytes))
 211                         break;
 212                 if (time_after_eq(jiffies, end_jiffies)) {
 213                         ret = -EBUSY;
 214                         DRM_ERROR("SVGA device lockup.\n");
 215                         break;
 216                 }
 217                 schedule_timeout(1);
 218                 if (interruptible && signal_pending(current)) {
 219                         ret = -ERESTARTSYS;
 220                         break;
 221                 }
 222         }
 223         finish_wait(&dev_priv->fifo_queue, &__wait);
 224         wake_up_all(&dev_priv->fifo_queue);
 225         DRM_INFO("Fifo noirq exit.\n");
 226         return ret;
 227 }
 228
 229 static int vmw_fifo_wait(struct vmw_private *dev_priv,
 230                          uint32_t bytes, bool interruptible,
 231                          unsigned long timeout)
 232 {
 233         long ret = 1L;
 234
 235         if (likely(!vmw_fifo_is_full(dev_priv, bytes)))
 236                 return 0;
 237
 238         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_FIFOFULL);
 239         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 240                 return vmw_fifo_wait_noirq(dev_priv, bytes,
 241                                            interruptible, timeout);
 242
 243         vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_FIFO_PROGRESS,
 244                                &dev_priv->fifo_queue_waiters);
 245
 246         if (interruptible)
 247                 ret = wait_event_interruptible_timeout
 248                     (dev_priv->fifo_queue,
 249                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 250         else
 251                 ret = wait_event_timeout
 252                     (dev_priv->fifo_queue,
 253                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 254
 255         if (unlikely(ret == 0))
 256                 ret = -EBUSY;
 257         else if (likely(ret > 0))
 258                 ret = 0;
 259
 260         vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_FIFO_PROGRESS,
 261                                   &dev_priv->fifo_queue_waiters);
 262
 263         return ret;
 264 }
 265
 266 /*
 267  * Reserve @bytes number of bytes in the fifo.
 268  *
 269  * This function will return NULL (error) on two conditions:
 270  *  If it timeouts waiting for fifo space, or if @bytes is larger than the
 271  *   available fifo space.
 272  *
 273  * Returns:
 274  *   Pointer to the fifo, or null on error (possible hardware hang).
 275  */
 276 static void *vmw_local_fifo_reserve(struct vmw_private *dev_priv,
 277                                     uint32_t bytes)
 278 {
 279         struct vmw_fifo_state *fifo_state = dev_priv->fifo;
 280         u32  *fifo_mem = dev_priv->fifo_mem;
 281         uint32_t max;
 282         uint32_t min;
 283         uint32_t next_cmd;
 284         uint32_t reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 285         int ret;
 286
 287         mutex_lock(&fifo_state->fifo_mutex);
 288         max = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MAX);
 289         min = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MIN);
 290         next_cmd = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_NEXT_CMD);
 291
 292         if (unlikely(bytes >= (max - min)))
 293                 goto out_err;
 294
 295         BUG_ON(fifo_state->reserved_size != 0);
 296         BUG_ON(fifo_state->dynamic_buffer != NULL);
 297
 298         fifo_state->reserved_size = bytes;
 299
 300         while (1) {
 301                 uint32_t stop = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_STOP);
 302                 bool need_bounce = false;
 303                 bool reserve_in_place = false;
 304
 305                 if (next_cmd >= stop) {
 306                         if (likely((next_cmd + bytes < max ||
 307                                     (next_cmd + bytes == max && stop > min))))
 308                                 reserve_in_place = true;
 309
 310                         else if (vmw_fifo_is_full(dev_priv, bytes)) {
 311                                 ret = vmw_fifo_wait(dev_priv, bytes,
 312                                                     false, 3 * HZ);
 313                                 if (unlikely(ret != 0))
 314                                         goto out_err;
 315                         } else
 316                                 need_bounce = true;
 317
 318                 } else {
 319
 320                         if (likely((next_cmd + bytes < stop)))
 321                                 reserve_in_place = true;
 322                         else {
 323                                 ret = vmw_fifo_wait(dev_priv, bytes,
 324                                                     false, 3 * HZ);
 325                                 if (unlikely(ret != 0))
 326                                         goto out_err;
 327                         }
 328                 }
 329
 330                 if (reserve_in_place) {
 331                         if (reserveable || bytes <= sizeof(uint32_t)) {
 332                                 fifo_state->using_bounce_buffer = false;
 333
 334                                 if (reserveable)
 335                                         vmw_fifo_mem_write(dev_priv,
 336                                                            SVGA_FIFO_RESERVED,
 337                                                            bytes);
 338                                 return (void __force *) (fifo_mem +
 339                                                          (next_cmd >> 2));
 340                         } else {
 341                                 need_bounce = true;
 342                         }
 343                 }
 344
 345                 if (need_bounce) {
 346                         fifo_state->using_bounce_buffer = true;
 347                         if (bytes < fifo_state->static_buffer_size)
 348                                 return fifo_state->static_buffer;
 349                         else {
 350                                 fifo_state->dynamic_buffer = vmalloc(bytes);
 351                                 if (!fifo_state->dynamic_buffer)
 352                                         goto out_err;
 353                                 return fifo_state->dynamic_buffer;
 354                         }
 355                 }
 356         }
 357 out_err:
 358         fifo_state->reserved_size = 0;
 359         mutex_unlock(&fifo_state->fifo_mutex);
 360
 361         return NULL;
 362 }
 363
 364 void *vmw_cmd_ctx_reserve(struct vmw_private *dev_priv, uint32_t bytes,
 365                           int ctx_id)
 366 {
 367         void *ret;
 368
 369         if (dev_priv->cman)
 370                 ret = vmw_cmdbuf_reserve(dev_priv->cman, bytes,
 371                                          ctx_id, false, NULL);
 372         else if (ctx_id == SVGA3D_INVALID_ID)
 373                 ret = vmw_local_fifo_reserve(dev_priv, bytes);
 374         else {
 375                 WARN(1, "Command buffer has not been allocated.\n");
 376                 ret = NULL;
 377         }
 378         if (IS_ERR_OR_NULL(ret))
 379                 return NULL;
 380
 381         return ret;
 382 }
 383
 384 static void vmw_fifo_res_copy(struct vmw_fifo_state *fifo_state,
 385                               struct vmw_private *vmw,
 386                               uint32_t next_cmd,
 387                               uint32_t max, uint32_t min, uint32_t bytes)
 388 {
 389         u32 *fifo_mem = vmw->fifo_mem;
 390         uint32_t chunk_size = max - next_cmd;
 391         uint32_t rest;
 392         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 393             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 394
 395         if (bytes < chunk_size)
 396                 chunk_size = bytes;
 397
 398         vmw_fifo_mem_write(vmw, SVGA_FIFO_RESERVED, bytes);
 399         mb();
 400         memcpy(fifo_mem + (next_cmd >> 2), buffer, chunk_size);
 401         rest = bytes - chunk_size;
 402         if (rest)
 403                 memcpy(fifo_mem + (min >> 2), buffer + (chunk_size >> 2), rest);
 404 }
 405
 406 static void vmw_fifo_slow_copy(struct vmw_fifo_state *fifo_state,
 407                                struct vmw_private *vmw,
 408                                uint32_t next_cmd,
 409                                uint32_t max, uint32_t min, uint32_t bytes)
 410 {
 411         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 412             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 413
 414         while (bytes > 0) {
 415                 vmw_fifo_mem_write(vmw, (next_cmd >> 2), *buffer++);
 416                 next_cmd += sizeof(uint32_t);
 417                 if (unlikely(next_cmd == max))
 418                         next_cmd = min;
 419                 mb();
 420                 vmw_fifo_mem_write(vmw, SVGA_FIFO_NEXT_CMD, next_cmd);
 421                 mb();
 422                 bytes -= sizeof(uint32_t);
 423         }
 424 }
 425
 426 static void vmw_local_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
 427 {
 428         struct vmw_fifo_state *fifo_state = dev_priv->fifo;
 429         uint32_t next_cmd = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_NEXT_CMD);
 430         uint32_t max = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MAX);
 431         uint32_t min = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_MIN);
 432         bool reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 433
 434         BUG_ON((bytes & 3) != 0);
 435         BUG_ON(bytes > fifo_state->reserved_size);
 436
 437         fifo_state->reserved_size = 0;
 438
 439         if (fifo_state->using_bounce_buffer) {
 440                 if (reserveable)
 441                         vmw_fifo_res_copy(fifo_state, dev_priv,
 442                                           next_cmd, max, min, bytes);
 443                 else
 444                         vmw_fifo_slow_copy(fifo_state, dev_priv,
 445                                            next_cmd, max, min, bytes);
 446
 447                 if (fifo_state->dynamic_buffer) {
 448                         vfree(fifo_state->dynamic_buffer);
 449                         fifo_state->dynamic_buffer = NULL;
 450                 }
 451
 452         }
 453
 454         down_write(&fifo_state->rwsem);
 455         if (fifo_state->using_bounce_buffer || reserveable) {
 456                 next_cmd += bytes;
 457                 if (next_cmd >= max)
 458                         next_cmd -= max - min;
 459                 mb();
 460                 vmw_fifo_mem_write(dev_priv, SVGA_FIFO_NEXT_CMD, next_cmd);
 461         }
 462
 463         if (reserveable)
 464                 vmw_fifo_mem_write(dev_priv, SVGA_FIFO_RESERVED, 0);
 465         mb();
 466         up_write(&fifo_state->rwsem);
 467         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 468         mutex_unlock(&fifo_state->fifo_mutex);
 469 }
 470
 471 void vmw_cmd_commit(struct vmw_private *dev_priv, uint32_t bytes)
 472 {
 473         if (dev_priv->cman)
 474                 vmw_cmdbuf_commit(dev_priv->cman, bytes, NULL, false);
 475         else
 476                 vmw_local_fifo_commit(dev_priv, bytes);
 477 }
 478
 479
 480 /**
 481  * vmw_cmd_commit_flush - Commit fifo space and flush any buffered commands.
 482  *
 483  * @dev_priv: Pointer to device private structure.
 484  * @bytes: Number of bytes to commit.
 485  */
 486 void vmw_cmd_commit_flush(struct vmw_private *dev_priv, uint32_t bytes)
 487 {
 488         if (dev_priv->cman)
 489                 vmw_cmdbuf_commit(dev_priv->cman, bytes, NULL, true);
 490         else
 491                 vmw_local_fifo_commit(dev_priv, bytes);
 492 }
 493
 494 /**
 495  * vmw_cmd_flush - Flush any buffered commands and make sure command processing
 496  * starts.
 497  *
 498  * @dev_priv: Pointer to device private structure.
 499  * @interruptible: Whether to wait interruptible if function needs to sleep.
 500  */
 501 int vmw_cmd_flush(struct vmw_private *dev_priv, bool interruptible)
 502 {
 503         might_sleep();
 504
 505         if (dev_priv->cman)
 506                 return vmw_cmdbuf_cur_flush(dev_priv->cman, interruptible);
 507         else
 508                 return 0;
 509 }
 510
 511 int vmw_cmd_send_fence(struct vmw_private *dev_priv, uint32_t *seqno)
 512 {
 513         struct svga_fifo_cmd_fence *cmd_fence;
 514         u32 *fm;
 515         int ret = 0;
 516         uint32_t bytes = sizeof(u32) + sizeof(*cmd_fence);
 517
 518         fm = VMW_CMD_RESERVE(dev_priv, bytes);
 519         if (unlikely(fm == NULL)) {
 520                 *seqno = atomic_read(&dev_priv->marker_seq);
 521                 ret = -ENOMEM;
 522                 (void)vmw_fallback_wait(dev_priv, false, true, *seqno,
 523                                         false, 3*HZ);
 524                 goto out_err;
 525         }
 526
 527         do {
 528                 *seqno = atomic_add_return(1, &dev_priv->marker_seq);
 529         } while (*seqno == 0);
 530
 531         if (!vmw_has_fences(dev_priv)) {
 532
 533                 /*
 534                  * Don't request hardware to send a fence. The
 535                  * waiting code in vmwgfx_irq.c will emulate this.
 536                  */
 537
 538                 vmw_cmd_commit(dev_priv, 0);
 539                 return 0;
 540         }
 541
 542         *fm++ = SVGA_CMD_FENCE;
 543         cmd_fence = (struct svga_fifo_cmd_fence *) fm;
 544         cmd_fence->fence = *seqno;
 545         vmw_cmd_commit_flush(dev_priv, bytes);
 546         vmw_update_seqno(dev_priv);
 547
 548 out_err:
 549         return ret;
 550 }
 551
 552 /**
 553  * vmw_cmd_emit_dummy_legacy_query - emits a dummy query to the fifo using
 554  * legacy query commands.
 555  *
 556  * @dev_priv: The device private structure.
 557  * @cid: The hardware context id used for the query.
 558  *
 559  * See the vmw_cmd_emit_dummy_query documentation.
 560  */
 561 static int vmw_cmd_emit_dummy_legacy_query(struct vmw_private *dev_priv,
 562                                             uint32_t cid)
 563 {
 564         /*
 565          * A query wait without a preceding query end will
 566          * actually finish all queries for this cid
 567          * without writing to the query result structure.
 568          */
 569
 570         struct ttm_buffer_object *bo = &dev_priv->dummy_query_bo->tbo;
 571         struct {
 572                 SVGA3dCmdHeader header;
 573                 SVGA3dCmdWaitForQuery body;
 574         } *cmd;
 575
 576         cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
 577         if (unlikely(cmd == NULL))
 578                 return -ENOMEM;
 579
 580         cmd->header.id = SVGA_3D_CMD_WAIT_FOR_QUERY;
 581         cmd->header.size = sizeof(cmd->body);
 582         cmd->body.cid = cid;
 583         cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
 584
 585         if (bo->resource->mem_type == TTM_PL_VRAM) {
 586                 cmd->body.guestResult.gmrId = SVGA_GMR_FRAMEBUFFER;
 587                 cmd->body.guestResult.offset = bo->resource->start << PAGE_SHIFT;
 588         } else {
 589                 cmd->body.guestResult.gmrId = bo->resource->start;
 590                 cmd->body.guestResult.offset = 0;
 591         }
 592
 593         vmw_cmd_commit(dev_priv, sizeof(*cmd));
 594
 595         return 0;
 596 }
 597
 598 /**
 599  * vmw_cmd_emit_dummy_gb_query - emits a dummy query to the fifo using
 600  * guest-backed resource query commands.
 601  *
 602  * @dev_priv: The device private structure.
 603  * @cid: The hardware context id used for the query.
 604  *
 605  * See the vmw_cmd_emit_dummy_query documentation.
 606  */
 607 static int vmw_cmd_emit_dummy_gb_query(struct vmw_private *dev_priv,
 608                                        uint32_t cid)
 609 {
 610         /*
 611          * A query wait without a preceding query end will
 612          * actually finish all queries for this cid
 613          * without writing to the query result structure.
 614          */
 615
 616         struct ttm_buffer_object *bo = &dev_priv->dummy_query_bo->tbo;
 617         struct {
 618                 SVGA3dCmdHeader header;
 619                 SVGA3dCmdWaitForGBQuery body;
 620         } *cmd;
 621
 622         cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
 623         if (unlikely(cmd == NULL))
 624                 return -ENOMEM;
 625
 626         cmd->header.id = SVGA_3D_CMD_WAIT_FOR_GB_QUERY;
 627         cmd->header.size = sizeof(cmd->body);
 628         cmd->body.cid = cid;
 629         cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
 630         BUG_ON(bo->resource->mem_type != VMW_PL_MOB);
 631         cmd->body.mobid = bo->resource->start;
 632         cmd->body.offset = 0;
 633
 634         vmw_cmd_commit(dev_priv, sizeof(*cmd));
 635
 636         return 0;
 637 }
 638
 639
 640 /**
 641  * vmw_cmd_emit_dummy_query - emits a dummy query to the fifo using
 642  * appropriate resource query commands.
 643  *
 644  * @dev_priv: The device private structure.
 645  * @cid: The hardware context id used for the query.
 646  *
 647  * This function is used to emit a dummy occlusion query with
 648  * no primitives rendered between query begin and query end.
 649  * It's used to provide a query barrier, in order to know that when
 650  * this query is finished, all preceding queries are also finished.
 651  *
 652  * A Query results structure should have been initialized at the start
 653  * of the dev_priv->dummy_query_bo buffer object. And that buffer object
 654  * must also be either reserved or pinned when this function is called.
 655  *
 656  * Returns -ENOMEM on failure to reserve fifo space.
 657  */
 658 int vmw_cmd_emit_dummy_query(struct vmw_private *dev_priv,
 659                               uint32_t cid)
 660 {
 661         if (dev_priv->has_mob)
 662                 return vmw_cmd_emit_dummy_gb_query(dev_priv, cid);
 663
 664         return vmw_cmd_emit_dummy_legacy_query(dev_priv, cid);
 665 }
 666
 667
 668 /**
 669  * vmw_cmd_supported - returns true if the given device supports
 670  * command queues.
 671  *
 672  * @vmw: The device private structure.
 673  *
 674  * Returns true if we can issue commands.
 675  */
 676 bool vmw_cmd_supported(struct vmw_private *vmw)
 677 {
 678         bool has_cmdbufs =
 679                 (vmw->capabilities & (SVGA_CAP_COMMAND_BUFFERS |
 680                                       SVGA_CAP_CMD_BUFFERS_2)) != 0;
 681         if (vmw_is_svga_v3(vmw))
 682                 return (has_cmdbufs &&
 683                         (vmw->capabilities & SVGA_CAP_GBOBJECTS) != 0);
 684         /*
 685          * We have FIFO cmd's
 686          */
 687         return has_cmdbufs || vmw->fifo_mem != NULL;
 688 }