drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2009-2015 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
  28 #include "vmwgfx_drv.h"
  29 #include <drm/drmP.h>
  30 #include <drm/ttm/ttm_placement.h>
  31
  32 struct vmw_temp_set_context {
  33         SVGA3dCmdHeader header;
  34         SVGA3dCmdDXTempSetContext body;
  35 };
  36
  37 bool vmw_fifo_have_3d(struct vmw_private *dev_priv)
  38 {
  39         u32 *fifo_mem = dev_priv->mmio_virt;
  40         uint32_t fifo_min, hwversion;
  41         const struct vmw_fifo_state *fifo = &dev_priv->fifo;
  42
  43         if (!(dev_priv->capabilities & SVGA_CAP_3D))
  44                 return false;
  45
  46         if (dev_priv->capabilities & SVGA_CAP_GBOBJECTS) {
  47                 uint32_t result;
  48
  49                 if (!dev_priv->has_mob)
  50                         return false;
  51
  52                 spin_lock(&dev_priv->cap_lock);
  53                 vmw_write(dev_priv, SVGA_REG_DEV_CAP, SVGA3D_DEVCAP_3D);
  54                 result = vmw_read(dev_priv, SVGA_REG_DEV_CAP);
  55                 spin_unlock(&dev_priv->cap_lock);
  56
  57                 return (result != 0);
  58         }
  59
  60         if (!(dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO))
  61                 return false;
  62
  63         fifo_min = vmw_mmio_read(fifo_mem  + SVGA_FIFO_MIN);
  64         if (fifo_min <= SVGA_FIFO_3D_HWVERSION * sizeof(unsigned int))
  65                 return false;
  66
  67         hwversion = vmw_mmio_read(fifo_mem +
  68                                   ((fifo->capabilities &
  69                                     SVGA_FIFO_CAP_3D_HWVERSION_REVISED) ?
  70                                    SVGA_FIFO_3D_HWVERSION_REVISED :
  71                                    SVGA_FIFO_3D_HWVERSION));
  72
  73         if (hwversion == 0)
  74                 return false;
  75
  76         if (hwversion < SVGA3D_HWVERSION_WS8_B1)
  77                 return false;
  78
  79         /* Legacy Display Unit does not support surfaces */
  80         if (dev_priv->active_display_unit == vmw_du_legacy)
  81                 return false;
  82
  83         return true;
  84 }
  85
  86 bool vmw_fifo_have_pitchlock(struct vmw_private *dev_priv)
  87 {
  88         u32  *fifo_mem = dev_priv->mmio_virt;
  89         uint32_t caps;
  90
  91         if (!(dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO))
  92                 return false;
  93
  94         caps = vmw_mmio_read(fifo_mem + SVGA_FIFO_CAPABILITIES);
  95         if (caps & SVGA_FIFO_CAP_PITCHLOCK)
  96                 return true;
  97
  98         return false;
  99 }
 100
 101 int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
 102 {
 103         u32  *fifo_mem = dev_priv->mmio_virt;
 104         uint32_t max;
 105         uint32_t min;
 106
 107         fifo->dx = false;
 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                 return -ENOMEM;
 112
 113         fifo->dynamic_buffer = NULL;
 114         fifo->reserved_size = 0;
 115         fifo->using_bounce_buffer = false;
 116
 117         mutex_init(&fifo->fifo_mutex);
 118         init_rwsem(&fifo->rwsem);
 119
 120         DRM_INFO("width %d\n", vmw_read(dev_priv, SVGA_REG_WIDTH));
 121         DRM_INFO("height %d\n", vmw_read(dev_priv, SVGA_REG_HEIGHT));
 122         DRM_INFO("bpp %d\n", vmw_read(dev_priv, SVGA_REG_BITS_PER_PIXEL));
 123
 124         dev_priv->enable_state = vmw_read(dev_priv, SVGA_REG_ENABLE);
 125         dev_priv->config_done_state = vmw_read(dev_priv, SVGA_REG_CONFIG_DONE);
 126         dev_priv->traces_state = vmw_read(dev_priv, SVGA_REG_TRACES);
 127
 128         vmw_write(dev_priv, SVGA_REG_ENABLE, SVGA_REG_ENABLE_ENABLE |
 129                   SVGA_REG_ENABLE_HIDE);
 130         vmw_write(dev_priv, SVGA_REG_TRACES, 0);
 131
 132         min = 4;
 133         if (dev_priv->capabilities & SVGA_CAP_EXTENDED_FIFO)
 134                 min = vmw_read(dev_priv, SVGA_REG_MEM_REGS);
 135         min <<= 2;
 136
 137         if (min < PAGE_SIZE)
 138                 min = PAGE_SIZE;
 139
 140         vmw_mmio_write(min, fifo_mem + SVGA_FIFO_MIN);
 141         vmw_mmio_write(dev_priv->mmio_size, fifo_mem + SVGA_FIFO_MAX);
 142         wmb();
 143         vmw_mmio_write(min,  fifo_mem + SVGA_FIFO_NEXT_CMD);
 144         vmw_mmio_write(min,  fifo_mem + SVGA_FIFO_STOP);
 145         vmw_mmio_write(0, fifo_mem + SVGA_FIFO_BUSY);
 146         mb();
 147
 148         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE, 1);
 149
 150         max = vmw_mmio_read(fifo_mem + SVGA_FIFO_MAX);
 151         min = vmw_mmio_read(fifo_mem  + SVGA_FIFO_MIN);
 152         fifo->capabilities = vmw_mmio_read(fifo_mem + SVGA_FIFO_CAPABILITIES);
 153
 154         DRM_INFO("Fifo max 0x%08x min 0x%08x cap 0x%08x\n",
 155                  (unsigned int) max,
 156                  (unsigned int) min,
 157                  (unsigned int) fifo->capabilities);
 158
 159         atomic_set(&dev_priv->marker_seq, dev_priv->last_read_seqno);
 160         vmw_mmio_write(dev_priv->last_read_seqno, fifo_mem + SVGA_FIFO_FENCE);
 161         vmw_marker_queue_init(&fifo->marker_queue);
 162
 163         return 0;
 164 }
 165
 166 void vmw_fifo_ping_host(struct vmw_private *dev_priv, uint32_t reason)
 167 {
 168         u32 *fifo_mem = dev_priv->mmio_virt;
 169
 170         preempt_disable();
 171         if (cmpxchg(fifo_mem + SVGA_FIFO_BUSY, 0, 1) == 0)
 172                 vmw_write(dev_priv, SVGA_REG_SYNC, reason);
 173         preempt_enable();
 174 }
 175
 176 void vmw_fifo_release(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
 177 {
 178         u32  *fifo_mem = dev_priv->mmio_virt;
 179
 180         vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC);
 181         while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0)
 182                 ;
 183
 184         dev_priv->last_read_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
 185
 186         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE,
 187                   dev_priv->config_done_state);
 188         vmw_write(dev_priv, SVGA_REG_ENABLE,
 189                   dev_priv->enable_state);
 190         vmw_write(dev_priv, SVGA_REG_TRACES,
 191                   dev_priv->traces_state);
 192
 193         vmw_marker_queue_takedown(&fifo->marker_queue);
 194
 195         if (likely(fifo->static_buffer != NULL)) {
 196                 vfree(fifo->static_buffer);
 197                 fifo->static_buffer = NULL;
 198         }
 199
 200         if (likely(fifo->dynamic_buffer != NULL)) {
 201                 vfree(fifo->dynamic_buffer);
 202                 fifo->dynamic_buffer = NULL;
 203         }
 204 }
 205
 206 static bool vmw_fifo_is_full(struct vmw_private *dev_priv, uint32_t bytes)
 207 {
 208         u32  *fifo_mem = dev_priv->mmio_virt;
 209         uint32_t max = vmw_mmio_read(fifo_mem + SVGA_FIFO_MAX);
 210         uint32_t next_cmd = vmw_mmio_read(fifo_mem + SVGA_FIFO_NEXT_CMD);
 211         uint32_t min = vmw_mmio_read(fifo_mem + SVGA_FIFO_MIN);
 212         uint32_t stop = vmw_mmio_read(fifo_mem + SVGA_FIFO_STOP);
 213
 214         return ((max - next_cmd) + (stop - min) <= bytes);
 215 }
 216
 217 static int vmw_fifo_wait_noirq(struct vmw_private *dev_priv,
 218                                uint32_t bytes, bool interruptible,
 219                                unsigned long timeout)
 220 {
 221         int ret = 0;
 222         unsigned long end_jiffies = jiffies + timeout;
 223         DEFINE_WAIT(__wait);
 224
 225         DRM_INFO("Fifo wait noirq.\n");
 226
 227         for (;;) {
 228                 prepare_to_wait(&dev_priv->fifo_queue, &__wait,
 229                                 (interruptible) ?
 230                                 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 231                 if (!vmw_fifo_is_full(dev_priv, bytes))
 232                         break;
 233                 if (time_after_eq(jiffies, end_jiffies)) {
 234                         ret = -EBUSY;
 235                         DRM_ERROR("SVGA device lockup.\n");
 236                         break;
 237                 }
 238                 schedule_timeout(1);
 239                 if (interruptible && signal_pending(current)) {
 240                         ret = -ERESTARTSYS;
 241                         break;
 242                 }
 243         }
 244         finish_wait(&dev_priv->fifo_queue, &__wait);
 245         wake_up_all(&dev_priv->fifo_queue);
 246         DRM_INFO("Fifo noirq exit.\n");
 247         return ret;
 248 }
 249
 250 static int vmw_fifo_wait(struct vmw_private *dev_priv,
 251                          uint32_t bytes, bool interruptible,
 252                          unsigned long timeout)
 253 {
 254         long ret = 1L;
 255
 256         if (likely(!vmw_fifo_is_full(dev_priv, bytes)))
 257                 return 0;
 258
 259         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_FIFOFULL);
 260         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 261                 return vmw_fifo_wait_noirq(dev_priv, bytes,
 262                                            interruptible, timeout);
 263
 264         vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_FIFO_PROGRESS,
 265                                &dev_priv->fifo_queue_waiters);
 266
 267         if (interruptible)
 268                 ret = wait_event_interruptible_timeout
 269                     (dev_priv->fifo_queue,
 270                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 271         else
 272                 ret = wait_event_timeout
 273                     (dev_priv->fifo_queue,
 274                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 275
 276         if (unlikely(ret == 0))
 277                 ret = -EBUSY;
 278         else if (likely(ret > 0))
 279                 ret = 0;
 280
 281         vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_FIFO_PROGRESS,
 282                                   &dev_priv->fifo_queue_waiters);
 283
 284         return ret;
 285 }
 286
 287 /**
 288  * Reserve @bytes number of bytes in the fifo.
 289  *
 290  * This function will return NULL (error) on two conditions:
 291  *  If it timeouts waiting for fifo space, or if @bytes is larger than the
 292  *   available fifo space.
 293  *
 294  * Returns:
 295  *   Pointer to the fifo, or null on error (possible hardware hang).
 296  */
 297 static void *vmw_local_fifo_reserve(struct vmw_private *dev_priv,
 298                                     uint32_t bytes)
 299 {
 300         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 301         u32  *fifo_mem = dev_priv->mmio_virt;
 302         uint32_t max;
 303         uint32_t min;
 304         uint32_t next_cmd;
 305         uint32_t reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 306         int ret;
 307
 308         mutex_lock(&fifo_state->fifo_mutex);
 309         max = vmw_mmio_read(fifo_mem + SVGA_FIFO_MAX);
 310         min = vmw_mmio_read(fifo_mem + SVGA_FIFO_MIN);
 311         next_cmd = vmw_mmio_read(fifo_mem + SVGA_FIFO_NEXT_CMD);
 312
 313         if (unlikely(bytes >= (max - min)))
 314                 goto out_err;
 315
 316         BUG_ON(fifo_state->reserved_size != 0);
 317         BUG_ON(fifo_state->dynamic_buffer != NULL);
 318
 319         fifo_state->reserved_size = bytes;
 320
 321         while (1) {
 322                 uint32_t stop = vmw_mmio_read(fifo_mem + SVGA_FIFO_STOP);
 323                 bool need_bounce = false;
 324                 bool reserve_in_place = false;
 325
 326                 if (next_cmd >= stop) {
 327                         if (likely((next_cmd + bytes < max ||
 328                                     (next_cmd + bytes == max && stop > min))))
 329                                 reserve_in_place = true;
 330
 331                         else if (vmw_fifo_is_full(dev_priv, bytes)) {
 332                                 ret = vmw_fifo_wait(dev_priv, bytes,
 333                                                     false, 3 * HZ);
 334                                 if (unlikely(ret != 0))
 335                                         goto out_err;
 336                         } else
 337                                 need_bounce = true;
 338
 339                 } else {
 340
 341                         if (likely((next_cmd + bytes < stop)))
 342                                 reserve_in_place = true;
 343                         else {
 344                                 ret = vmw_fifo_wait(dev_priv, bytes,
 345                                                     false, 3 * HZ);
 346                                 if (unlikely(ret != 0))
 347                                         goto out_err;
 348                         }
 349                 }
 350
 351                 if (reserve_in_place) {
 352                         if (reserveable || bytes <= sizeof(uint32_t)) {
 353                                 fifo_state->using_bounce_buffer = false;
 354
 355                                 if (reserveable)
 356                                         vmw_mmio_write(bytes, fifo_mem +
 357                                                        SVGA_FIFO_RESERVED);
 358                                 return (void __force *) (fifo_mem +
 359                                                          (next_cmd >> 2));
 360                         } else {
 361                                 need_bounce = true;
 362                         }
 363                 }
 364
 365                 if (need_bounce) {
 366                         fifo_state->using_bounce_buffer = true;
 367                         if (bytes < fifo_state->static_buffer_size)
 368                                 return fifo_state->static_buffer;
 369                         else {
 370                                 fifo_state->dynamic_buffer = vmalloc(bytes);
 371                                 if (!fifo_state->dynamic_buffer)
 372                                         goto out_err;
 373                                 return fifo_state->dynamic_buffer;
 374                         }
 375                 }
 376         }
 377 out_err:
 378         fifo_state->reserved_size = 0;
 379         mutex_unlock(&fifo_state->fifo_mutex);
 380
 381         return NULL;
 382 }
 383
 384 void *vmw_fifo_reserve_dx(struct vmw_private *dev_priv, uint32_t bytes,
 385                           int ctx_id)
 386 {
 387         void *ret;
 388
 389         if (dev_priv->cman)
 390                 ret = vmw_cmdbuf_reserve(dev_priv->cman, bytes,
 391                                          ctx_id, false, NULL);
 392         else if (ctx_id == SVGA3D_INVALID_ID)
 393                 ret = vmw_local_fifo_reserve(dev_priv, bytes);
 394         else {
 395                 WARN(1, "Command buffer has not been allocated.\n");
 396                 ret = NULL;
 397         }
 398         if (IS_ERR_OR_NULL(ret))
 399                 return NULL;
 400
 401         return ret;
 402 }
 403
 404 static void vmw_fifo_res_copy(struct vmw_fifo_state *fifo_state,
 405                               u32  *fifo_mem,
 406                               uint32_t next_cmd,
 407                               uint32_t max, uint32_t min, uint32_t bytes)
 408 {
 409         uint32_t chunk_size = max - next_cmd;
 410         uint32_t rest;
 411         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 412             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 413
 414         if (bytes < chunk_size)
 415                 chunk_size = bytes;
 416
 417         vmw_mmio_write(bytes, fifo_mem + SVGA_FIFO_RESERVED);
 418         mb();
 419         memcpy(fifo_mem + (next_cmd >> 2), buffer, chunk_size);
 420         rest = bytes - chunk_size;
 421         if (rest)
 422                 memcpy(fifo_mem + (min >> 2), buffer + (chunk_size >> 2), rest);
 423 }
 424
 425 static void vmw_fifo_slow_copy(struct vmw_fifo_state *fifo_state,
 426                                u32  *fifo_mem,
 427                                uint32_t next_cmd,
 428                                uint32_t max, uint32_t min, uint32_t bytes)
 429 {
 430         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 431             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 432
 433         while (bytes > 0) {
 434                 vmw_mmio_write(*buffer++, fifo_mem + (next_cmd >> 2));
 435                 next_cmd += sizeof(uint32_t);
 436                 if (unlikely(next_cmd == max))
 437                         next_cmd = min;
 438                 mb();
 439                 vmw_mmio_write(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);
 440                 mb();
 441                 bytes -= sizeof(uint32_t);
 442         }
 443 }
 444
 445 static void vmw_local_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
 446 {
 447         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 448         u32  *fifo_mem = dev_priv->mmio_virt;
 449         uint32_t next_cmd = vmw_mmio_read(fifo_mem + SVGA_FIFO_NEXT_CMD);
 450         uint32_t max = vmw_mmio_read(fifo_mem + SVGA_FIFO_MAX);
 451         uint32_t min = vmw_mmio_read(fifo_mem + SVGA_FIFO_MIN);
 452         bool reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 453
 454         if (fifo_state->dx)
 455                 bytes += sizeof(struct vmw_temp_set_context);
 456
 457         fifo_state->dx = false;
 458         BUG_ON((bytes & 3) != 0);
 459         BUG_ON(bytes > fifo_state->reserved_size);
 460
 461         fifo_state->reserved_size = 0;
 462
 463         if (fifo_state->using_bounce_buffer) {
 464                 if (reserveable)
 465                         vmw_fifo_res_copy(fifo_state, fifo_mem,
 466                                           next_cmd, max, min, bytes);
 467                 else
 468                         vmw_fifo_slow_copy(fifo_state, fifo_mem,
 469                                            next_cmd, max, min, bytes);
 470
 471                 if (fifo_state->dynamic_buffer) {
 472                         vfree(fifo_state->dynamic_buffer);
 473                         fifo_state->dynamic_buffer = NULL;
 474                 }
 475
 476         }
 477
 478         down_write(&fifo_state->rwsem);
 479         if (fifo_state->using_bounce_buffer || reserveable) {
 480                 next_cmd += bytes;
 481                 if (next_cmd >= max)
 482                         next_cmd -= max - min;
 483                 mb();
 484                 vmw_mmio_write(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);
 485         }
 486
 487         if (reserveable)
 488                 vmw_mmio_write(0, fifo_mem + SVGA_FIFO_RESERVED);
 489         mb();
 490         up_write(&fifo_state->rwsem);
 491         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 492         mutex_unlock(&fifo_state->fifo_mutex);
 493 }
 494
 495 void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
 496 {
 497         if (dev_priv->cman)
 498                 vmw_cmdbuf_commit(dev_priv->cman, bytes, NULL, false);
 499         else
 500                 vmw_local_fifo_commit(dev_priv, bytes);
 501 }
 502
 503
 504 /**
 505  * vmw_fifo_commit_flush - Commit fifo space and flush any buffered commands.
 506  *
 507  * @dev_priv: Pointer to device private structure.
 508  * @bytes: Number of bytes to commit.
 509  */
 510 void vmw_fifo_commit_flush(struct vmw_private *dev_priv, uint32_t bytes)
 511 {
 512         if (dev_priv->cman)
 513                 vmw_cmdbuf_commit(dev_priv->cman, bytes, NULL, true);
 514         else
 515                 vmw_local_fifo_commit(dev_priv, bytes);
 516 }
 517
 518 /**
 519  * vmw_fifo_flush - Flush any buffered commands and make sure command processing
 520  * starts.
 521  *
 522  * @dev_priv: Pointer to device private structure.
 523  * @interruptible: Whether to wait interruptible if function needs to sleep.
 524  */
 525 int vmw_fifo_flush(struct vmw_private *dev_priv, bool interruptible)
 526 {
 527         might_sleep();
 528
 529         if (dev_priv->cman)
 530                 return vmw_cmdbuf_cur_flush(dev_priv->cman, interruptible);
 531         else
 532                 return 0;
 533 }
 534
 535 int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *seqno)
 536 {
 537         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 538         struct svga_fifo_cmd_fence *cmd_fence;
 539         u32 *fm;
 540         int ret = 0;
 541         uint32_t bytes = sizeof(u32) + sizeof(*cmd_fence);
 542
 543         fm = VMW_FIFO_RESERVE(dev_priv, bytes);
 544         if (unlikely(fm == NULL)) {
 545                 *seqno = atomic_read(&dev_priv->marker_seq);
 546                 ret = -ENOMEM;
 547                 (void)vmw_fallback_wait(dev_priv, false, true, *seqno,
 548                                         false, 3*HZ);
 549                 goto out_err;
 550         }
 551
 552         do {
 553                 *seqno = atomic_add_return(1, &dev_priv->marker_seq);
 554         } while (*seqno == 0);
 555
 556         if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE)) {
 557
 558                 /*
 559                  * Don't request hardware to send a fence. The
 560                  * waiting code in vmwgfx_irq.c will emulate this.
 561                  */
 562
 563                 vmw_fifo_commit(dev_priv, 0);
 564                 return 0;
 565         }
 566
 567         *fm++ = SVGA_CMD_FENCE;
 568         cmd_fence = (struct svga_fifo_cmd_fence *) fm;
 569         cmd_fence->fence = *seqno;
 570         vmw_fifo_commit_flush(dev_priv, bytes);
 571         (void) vmw_marker_push(&fifo_state->marker_queue, *seqno);
 572         vmw_update_seqno(dev_priv, fifo_state);
 573
 574 out_err:
 575         return ret;
 576 }
 577
 578 /**
 579  * vmw_fifo_emit_dummy_legacy_query - emits a dummy query to the fifo using
 580  * legacy query commands.
 581  *
 582  * @dev_priv: The device private structure.
 583  * @cid: The hardware context id used for the query.
 584  *
 585  * See the vmw_fifo_emit_dummy_query documentation.
 586  */
 587 static int vmw_fifo_emit_dummy_legacy_query(struct vmw_private *dev_priv,
 588                                             uint32_t cid)
 589 {
 590         /*
 591          * A query wait without a preceding query end will
 592          * actually finish all queries for this cid
 593          * without writing to the query result structure.
 594          */
 595
 596         struct ttm_buffer_object *bo = &dev_priv->dummy_query_bo->base;
 597         struct {
 598                 SVGA3dCmdHeader header;
 599                 SVGA3dCmdWaitForQuery body;
 600         } *cmd;
 601
 602         cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
 603         if (unlikely(cmd == NULL))
 604                 return -ENOMEM;
 605
 606         cmd->header.id = SVGA_3D_CMD_WAIT_FOR_QUERY;
 607         cmd->header.size = sizeof(cmd->body);
 608         cmd->body.cid = cid;
 609         cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
 610
 611         if (bo->mem.mem_type == TTM_PL_VRAM) {
 612                 cmd->body.guestResult.gmrId = SVGA_GMR_FRAMEBUFFER;
 613                 cmd->body.guestResult.offset = bo->offset;
 614         } else {
 615                 cmd->body.guestResult.gmrId = bo->mem.start;
 616                 cmd->body.guestResult.offset = 0;
 617         }
 618
 619         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 620
 621         return 0;
 622 }
 623
 624 /**
 625  * vmw_fifo_emit_dummy_gb_query - emits a dummy query to the fifo using
 626  * guest-backed resource query commands.
 627  *
 628  * @dev_priv: The device private structure.
 629  * @cid: The hardware context id used for the query.
 630  *
 631  * See the vmw_fifo_emit_dummy_query documentation.
 632  */
 633 static int vmw_fifo_emit_dummy_gb_query(struct vmw_private *dev_priv,
 634                                         uint32_t cid)
 635 {
 636         /*
 637          * A query wait without a preceding query end will
 638          * actually finish all queries for this cid
 639          * without writing to the query result structure.
 640          */
 641
 642         struct ttm_buffer_object *bo = &dev_priv->dummy_query_bo->base;
 643         struct {
 644                 SVGA3dCmdHeader header;
 645                 SVGA3dCmdWaitForGBQuery body;
 646         } *cmd;
 647
 648         cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
 649         if (unlikely(cmd == NULL))
 650                 return -ENOMEM;
 651
 652         cmd->header.id = SVGA_3D_CMD_WAIT_FOR_GB_QUERY;
 653         cmd->header.size = sizeof(cmd->body);
 654         cmd->body.cid = cid;
 655         cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
 656         BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
 657         cmd->body.mobid = bo->mem.start;
 658         cmd->body.offset = 0;
 659
 660         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 661
 662         return 0;
 663 }
 664
 665
 666 /**
 667  * vmw_fifo_emit_dummy_gb_query - emits a dummy query to the fifo using
 668  * appropriate resource query commands.
 669  *
 670  * @dev_priv: The device private structure.
 671  * @cid: The hardware context id used for the query.
 672  *
 673  * This function is used to emit a dummy occlusion query with
 674  * no primitives rendered between query begin and query end.
 675  * It's used to provide a query barrier, in order to know that when
 676  * this query is finished, all preceding queries are also finished.
 677  *
 678  * A Query results structure should have been initialized at the start
 679  * of the dev_priv->dummy_query_bo buffer object. And that buffer object
 680  * must also be either reserved or pinned when this function is called.
 681  *
 682  * Returns -ENOMEM on failure to reserve fifo space.
 683  */
 684 int vmw_fifo_emit_dummy_query(struct vmw_private *dev_priv,
 685                               uint32_t cid)
 686 {
 687         if (dev_priv->has_mob)
 688                 return vmw_fifo_emit_dummy_gb_query(dev_priv, cid);
 689
 690         return vmw_fifo_emit_dummy_legacy_query(dev_priv, cid);
 691 }