drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009-2015 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   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 __iomem *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 = ioread32(fifo_mem  + SVGA_FIFO_MIN);
  64         if (fifo_min <= SVGA_FIFO_3D_HWVERSION * sizeof(unsigned int))
  65                 return false;
  66
  67         hwversion = ioread32(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 __iomem *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 = ioread32(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 __iomem *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         iowrite32(min, fifo_mem + SVGA_FIFO_MIN);
 141         iowrite32(dev_priv->mmio_size, fifo_mem + SVGA_FIFO_MAX);
 142         wmb();
 143         iowrite32(min,  fifo_mem + SVGA_FIFO_NEXT_CMD);
 144         iowrite32(min,  fifo_mem + SVGA_FIFO_STOP);
 145         iowrite32(0, fifo_mem + SVGA_FIFO_BUSY);
 146         mb();
 147
 148         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE, 1);
 149
 150         max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 151         min = ioread32(fifo_mem  + SVGA_FIFO_MIN);
 152         fifo->capabilities = ioread32(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         iowrite32(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 __iomem *fifo_mem = dev_priv->mmio_virt;
 169         static DEFINE_SPINLOCK(ping_lock);
 170         unsigned long irq_flags;
 171
 172         /*
 173          * The ping_lock is needed because we don't have an atomic
 174          * test-and-set of the SVGA_FIFO_BUSY register.
 175          */
 176         spin_lock_irqsave(&ping_lock, irq_flags);
 177         if (unlikely(ioread32(fifo_mem + SVGA_FIFO_BUSY) == 0)) {
 178                 iowrite32(1, fifo_mem + SVGA_FIFO_BUSY);
 179                 vmw_write(dev_priv, SVGA_REG_SYNC, reason);
 180         }
 181         spin_unlock_irqrestore(&ping_lock, irq_flags);
 182 }
 183
 184 void vmw_fifo_release(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
 185 {
 186         u32 __iomem *fifo_mem = dev_priv->mmio_virt;
 187
 188         vmw_write(dev_priv, SVGA_REG_SYNC, SVGA_SYNC_GENERIC);
 189         while (vmw_read(dev_priv, SVGA_REG_BUSY) != 0)
 190                 ;
 191
 192         dev_priv->last_read_seqno = ioread32(fifo_mem + SVGA_FIFO_FENCE);
 193
 194         vmw_write(dev_priv, SVGA_REG_CONFIG_DONE,
 195                   dev_priv->config_done_state);
 196         vmw_write(dev_priv, SVGA_REG_ENABLE,
 197                   dev_priv->enable_state);
 198         vmw_write(dev_priv, SVGA_REG_TRACES,
 199                   dev_priv->traces_state);
 200
 201         vmw_marker_queue_takedown(&fifo->marker_queue);
 202
 203         if (likely(fifo->static_buffer != NULL)) {
 204                 vfree(fifo->static_buffer);
 205                 fifo->static_buffer = NULL;
 206         }
 207
 208         if (likely(fifo->dynamic_buffer != NULL)) {
 209                 vfree(fifo->dynamic_buffer);
 210                 fifo->dynamic_buffer = NULL;
 211         }
 212 }
 213
 214 static bool vmw_fifo_is_full(struct vmw_private *dev_priv, uint32_t bytes)
 215 {
 216         u32 __iomem *fifo_mem = dev_priv->mmio_virt;
 217         uint32_t max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 218         uint32_t next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
 219         uint32_t min = ioread32(fifo_mem + SVGA_FIFO_MIN);
 220         uint32_t stop = ioread32(fifo_mem + SVGA_FIFO_STOP);
 221
 222         return ((max - next_cmd) + (stop - min) <= bytes);
 223 }
 224
 225 static int vmw_fifo_wait_noirq(struct vmw_private *dev_priv,
 226                                uint32_t bytes, bool interruptible,
 227                                unsigned long timeout)
 228 {
 229         int ret = 0;
 230         unsigned long end_jiffies = jiffies + timeout;
 231         DEFINE_WAIT(__wait);
 232
 233         DRM_INFO("Fifo wait noirq.\n");
 234
 235         for (;;) {
 236                 prepare_to_wait(&dev_priv->fifo_queue, &__wait,
 237                                 (interruptible) ?
 238                                 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 239                 if (!vmw_fifo_is_full(dev_priv, bytes))
 240                         break;
 241                 if (time_after_eq(jiffies, end_jiffies)) {
 242                         ret = -EBUSY;
 243                         DRM_ERROR("SVGA device lockup.\n");
 244                         break;
 245                 }
 246                 schedule_timeout(1);
 247                 if (interruptible && signal_pending(current)) {
 248                         ret = -ERESTARTSYS;
 249                         break;
 250                 }
 251         }
 252         finish_wait(&dev_priv->fifo_queue, &__wait);
 253         wake_up_all(&dev_priv->fifo_queue);
 254         DRM_INFO("Fifo noirq exit.\n");
 255         return ret;
 256 }
 257
 258 static int vmw_fifo_wait(struct vmw_private *dev_priv,
 259                          uint32_t bytes, bool interruptible,
 260                          unsigned long timeout)
 261 {
 262         long ret = 1L;
 263         unsigned long irq_flags;
 264
 265         if (likely(!vmw_fifo_is_full(dev_priv, bytes)))
 266                 return 0;
 267
 268         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_FIFOFULL);
 269         if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 270                 return vmw_fifo_wait_noirq(dev_priv, bytes,
 271                                            interruptible, timeout);
 272
 273         spin_lock(&dev_priv->waiter_lock);
 274         if (atomic_add_return(1, &dev_priv->fifo_queue_waiters) > 0) {
 275                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 276                 outl(SVGA_IRQFLAG_FIFO_PROGRESS,
 277                      dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 278                 dev_priv->irq_mask |= SVGA_IRQFLAG_FIFO_PROGRESS;
 279                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 280                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 281         }
 282         spin_unlock(&dev_priv->waiter_lock);
 283
 284         if (interruptible)
 285                 ret = wait_event_interruptible_timeout
 286                     (dev_priv->fifo_queue,
 287                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 288         else
 289                 ret = wait_event_timeout
 290                     (dev_priv->fifo_queue,
 291                      !vmw_fifo_is_full(dev_priv, bytes), timeout);
 292
 293         if (unlikely(ret == 0))
 294                 ret = -EBUSY;
 295         else if (likely(ret > 0))
 296                 ret = 0;
 297
 298         spin_lock(&dev_priv->waiter_lock);
 299         if (atomic_dec_and_test(&dev_priv->fifo_queue_waiters)) {
 300                 spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
 301                 dev_priv->irq_mask &= ~SVGA_IRQFLAG_FIFO_PROGRESS;
 302                 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
 303                 spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 304         }
 305         spin_unlock(&dev_priv->waiter_lock);
 306
 307         return ret;
 308 }
 309
 310 /**
 311  * Reserve @bytes number of bytes in the fifo.
 312  *
 313  * This function will return NULL (error) on two conditions:
 314  *  If it timeouts waiting for fifo space, or if @bytes is larger than the
 315  *   available fifo space.
 316  *
 317  * Returns:
 318  *   Pointer to the fifo, or null on error (possible hardware hang).
 319  */
 320 static void *vmw_local_fifo_reserve(struct vmw_private *dev_priv,
 321                                     uint32_t bytes)
 322 {
 323         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 324         u32 __iomem *fifo_mem = dev_priv->mmio_virt;
 325         uint32_t max;
 326         uint32_t min;
 327         uint32_t next_cmd;
 328         uint32_t reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 329         int ret;
 330
 331         mutex_lock(&fifo_state->fifo_mutex);
 332         max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 333         min = ioread32(fifo_mem + SVGA_FIFO_MIN);
 334         next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
 335
 336         if (unlikely(bytes >= (max - min)))
 337                 goto out_err;
 338
 339         BUG_ON(fifo_state->reserved_size != 0);
 340         BUG_ON(fifo_state->dynamic_buffer != NULL);
 341
 342         fifo_state->reserved_size = bytes;
 343
 344         while (1) {
 345                 uint32_t stop = ioread32(fifo_mem + SVGA_FIFO_STOP);
 346                 bool need_bounce = false;
 347                 bool reserve_in_place = false;
 348
 349                 if (next_cmd >= stop) {
 350                         if (likely((next_cmd + bytes < max ||
 351                                     (next_cmd + bytes == max && stop > min))))
 352                                 reserve_in_place = true;
 353
 354                         else if (vmw_fifo_is_full(dev_priv, bytes)) {
 355                                 ret = vmw_fifo_wait(dev_priv, bytes,
 356                                                     false, 3 * HZ);
 357                                 if (unlikely(ret != 0))
 358                                         goto out_err;
 359                         } else
 360                                 need_bounce = true;
 361
 362                 } else {
 363
 364                         if (likely((next_cmd + bytes < stop)))
 365                                 reserve_in_place = true;
 366                         else {
 367                                 ret = vmw_fifo_wait(dev_priv, bytes,
 368                                                     false, 3 * HZ);
 369                                 if (unlikely(ret != 0))
 370                                         goto out_err;
 371                         }
 372                 }
 373
 374                 if (reserve_in_place) {
 375                         if (reserveable || bytes <= sizeof(uint32_t)) {
 376                                 fifo_state->using_bounce_buffer = false;
 377
 378                                 if (reserveable)
 379                                         iowrite32(bytes, fifo_mem +
 380                                                   SVGA_FIFO_RESERVED);
 381                                 return (void __force *) (fifo_mem +
 382                                                          (next_cmd >> 2));
 383                         } else {
 384                                 need_bounce = true;
 385                         }
 386                 }
 387
 388                 if (need_bounce) {
 389                         fifo_state->using_bounce_buffer = true;
 390                         if (bytes < fifo_state->static_buffer_size)
 391                                 return fifo_state->static_buffer;
 392                         else {
 393                                 fifo_state->dynamic_buffer = vmalloc(bytes);
 394                                 return fifo_state->dynamic_buffer;
 395                         }
 396                 }
 397         }
 398 out_err:
 399         fifo_state->reserved_size = 0;
 400         mutex_unlock(&fifo_state->fifo_mutex);
 401
 402         return NULL;
 403 }
 404
 405 void *vmw_fifo_reserve_dx(struct vmw_private *dev_priv, uint32_t bytes,
 406                           int ctx_id)
 407 {
 408         void *ret;
 409
 410         if (dev_priv->cman)
 411                 ret = vmw_cmdbuf_reserve(dev_priv->cman, bytes,
 412                                          ctx_id, false, NULL);
 413         else if (ctx_id == SVGA3D_INVALID_ID)
 414                 ret = vmw_local_fifo_reserve(dev_priv, bytes);
 415         else {
 416                 WARN_ON("Command buffer has not been allocated.\n");
 417                 ret = NULL;
 418         }
 419         if (IS_ERR_OR_NULL(ret)) {
 420                 DRM_ERROR("Fifo reserve failure of %u bytes.\n",
 421                           (unsigned) bytes);
 422                 dump_stack();
 423                 return NULL;
 424         }
 425
 426         return ret;
 427 }
 428
 429 static void vmw_fifo_res_copy(struct vmw_fifo_state *fifo_state,
 430                               u32 __iomem *fifo_mem,
 431                               uint32_t next_cmd,
 432                               uint32_t max, uint32_t min, uint32_t bytes)
 433 {
 434         uint32_t chunk_size = max - next_cmd;
 435         uint32_t rest;
 436         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 437             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 438
 439         if (bytes < chunk_size)
 440                 chunk_size = bytes;
 441
 442         iowrite32(bytes, fifo_mem + SVGA_FIFO_RESERVED);
 443         mb();
 444         memcpy_toio(fifo_mem + (next_cmd >> 2), buffer, chunk_size);
 445         rest = bytes - chunk_size;
 446         if (rest)
 447                 memcpy_toio(fifo_mem + (min >> 2), buffer + (chunk_size >> 2),
 448                             rest);
 449 }
 450
 451 static void vmw_fifo_slow_copy(struct vmw_fifo_state *fifo_state,
 452                                u32 __iomem *fifo_mem,
 453                                uint32_t next_cmd,
 454                                uint32_t max, uint32_t min, uint32_t bytes)
 455 {
 456         uint32_t *buffer = (fifo_state->dynamic_buffer != NULL) ?
 457             fifo_state->dynamic_buffer : fifo_state->static_buffer;
 458
 459         while (bytes > 0) {
 460                 iowrite32(*buffer++, fifo_mem + (next_cmd >> 2));
 461                 next_cmd += sizeof(uint32_t);
 462                 if (unlikely(next_cmd == max))
 463                         next_cmd = min;
 464                 mb();
 465                 iowrite32(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);
 466                 mb();
 467                 bytes -= sizeof(uint32_t);
 468         }
 469 }
 470
 471 static void vmw_local_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
 472 {
 473         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 474         u32 __iomem *fifo_mem = dev_priv->mmio_virt;
 475         uint32_t next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
 476         uint32_t max = ioread32(fifo_mem + SVGA_FIFO_MAX);
 477         uint32_t min = ioread32(fifo_mem + SVGA_FIFO_MIN);
 478         bool reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
 479
 480         if (fifo_state->dx)
 481                 bytes += sizeof(struct vmw_temp_set_context);
 482
 483         fifo_state->dx = false;
 484         BUG_ON((bytes & 3) != 0);
 485         BUG_ON(bytes > fifo_state->reserved_size);
 486
 487         fifo_state->reserved_size = 0;
 488
 489         if (fifo_state->using_bounce_buffer) {
 490                 if (reserveable)
 491                         vmw_fifo_res_copy(fifo_state, fifo_mem,
 492                                           next_cmd, max, min, bytes);
 493                 else
 494                         vmw_fifo_slow_copy(fifo_state, fifo_mem,
 495                                            next_cmd, max, min, bytes);
 496
 497                 if (fifo_state->dynamic_buffer) {
 498                         vfree(fifo_state->dynamic_buffer);
 499                         fifo_state->dynamic_buffer = NULL;
 500                 }
 501
 502         }
 503
 504         down_write(&fifo_state->rwsem);
 505         if (fifo_state->using_bounce_buffer || reserveable) {
 506                 next_cmd += bytes;
 507                 if (next_cmd >= max)
 508                         next_cmd -= max - min;
 509                 mb();
 510                 iowrite32(next_cmd, fifo_mem + SVGA_FIFO_NEXT_CMD);
 511         }
 512
 513         if (reserveable)
 514                 iowrite32(0, fifo_mem + SVGA_FIFO_RESERVED);
 515         mb();
 516         up_write(&fifo_state->rwsem);
 517         vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
 518         mutex_unlock(&fifo_state->fifo_mutex);
 519 }
 520
 521 void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
 522 {
 523         if (dev_priv->cman)
 524                 vmw_cmdbuf_commit(dev_priv->cman, bytes, NULL, false);
 525         else
 526                 vmw_local_fifo_commit(dev_priv, bytes);
 527 }
 528
 529
 530 /**
 531  * vmw_fifo_commit_flush - Commit fifo space and flush any buffered commands.
 532  *
 533  * @dev_priv: Pointer to device private structure.
 534  * @bytes: Number of bytes to commit.
 535  */
 536 void vmw_fifo_commit_flush(struct vmw_private *dev_priv, uint32_t bytes)
 537 {
 538         if (dev_priv->cman)
 539                 vmw_cmdbuf_commit(dev_priv->cman, bytes, NULL, true);
 540         else
 541                 vmw_local_fifo_commit(dev_priv, bytes);
 542 }
 543
 544 /**
 545  * vmw_fifo_flush - Flush any buffered commands and make sure command processing
 546  * starts.
 547  *
 548  * @dev_priv: Pointer to device private structure.
 549  * @interruptible: Whether to wait interruptible if function needs to sleep.
 550  */
 551 int vmw_fifo_flush(struct vmw_private *dev_priv, bool interruptible)
 552 {
 553         might_sleep();
 554
 555         if (dev_priv->cman)
 556                 return vmw_cmdbuf_cur_flush(dev_priv->cman, interruptible);
 557         else
 558                 return 0;
 559 }
 560
 561 int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *seqno)
 562 {
 563         struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
 564         struct svga_fifo_cmd_fence *cmd_fence;
 565         u32 *fm;
 566         int ret = 0;
 567         uint32_t bytes = sizeof(u32) + sizeof(*cmd_fence);
 568
 569         fm = vmw_fifo_reserve(dev_priv, bytes);
 570         if (unlikely(fm == NULL)) {
 571                 *seqno = atomic_read(&dev_priv->marker_seq);
 572                 ret = -ENOMEM;
 573                 (void)vmw_fallback_wait(dev_priv, false, true, *seqno,
 574                                         false, 3*HZ);
 575                 goto out_err;
 576         }
 577
 578         do {
 579                 *seqno = atomic_add_return(1, &dev_priv->marker_seq);
 580         } while (*seqno == 0);
 581
 582         if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE)) {
 583
 584                 /*
 585                  * Don't request hardware to send a fence. The
 586                  * waiting code in vmwgfx_irq.c will emulate this.
 587                  */
 588
 589                 vmw_fifo_commit(dev_priv, 0);
 590                 return 0;
 591         }
 592
 593         *fm++ = SVGA_CMD_FENCE;
 594         cmd_fence = (struct svga_fifo_cmd_fence *) fm;
 595         cmd_fence->fence = *seqno;
 596         vmw_fifo_commit_flush(dev_priv, bytes);
 597         (void) vmw_marker_push(&fifo_state->marker_queue, *seqno);
 598         vmw_update_seqno(dev_priv, fifo_state);
 599
 600 out_err:
 601         return ret;
 602 }
 603
 604 /**
 605  * vmw_fifo_emit_dummy_legacy_query - emits a dummy query to the fifo using
 606  * legacy query commands.
 607  *
 608  * @dev_priv: The device private structure.
 609  * @cid: The hardware context id used for the query.
 610  *
 611  * See the vmw_fifo_emit_dummy_query documentation.
 612  */
 613 static int vmw_fifo_emit_dummy_legacy_query(struct vmw_private *dev_priv,
 614                                             uint32_t cid)
 615 {
 616         /*
 617          * A query wait without a preceding query end will
 618          * actually finish all queries for this cid
 619          * without writing to the query result structure.
 620          */
 621
 622         struct ttm_buffer_object *bo = &dev_priv->dummy_query_bo->base;
 623         struct {
 624                 SVGA3dCmdHeader header;
 625                 SVGA3dCmdWaitForQuery body;
 626         } *cmd;
 627
 628         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 629
 630         if (unlikely(cmd == NULL)) {
 631                 DRM_ERROR("Out of fifo space for dummy query.\n");
 632                 return -ENOMEM;
 633         }
 634
 635         cmd->header.id = SVGA_3D_CMD_WAIT_FOR_QUERY;
 636         cmd->header.size = sizeof(cmd->body);
 637         cmd->body.cid = cid;
 638         cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
 639
 640         if (bo->mem.mem_type == TTM_PL_VRAM) {
 641                 cmd->body.guestResult.gmrId = SVGA_GMR_FRAMEBUFFER;
 642                 cmd->body.guestResult.offset = bo->offset;
 643         } else {
 644                 cmd->body.guestResult.gmrId = bo->mem.start;
 645                 cmd->body.guestResult.offset = 0;
 646         }
 647
 648         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 649
 650         return 0;
 651 }
 652
 653 /**
 654  * vmw_fifo_emit_dummy_gb_query - emits a dummy query to the fifo using
 655  * guest-backed resource query commands.
 656  *
 657  * @dev_priv: The device private structure.
 658  * @cid: The hardware context id used for the query.
 659  *
 660  * See the vmw_fifo_emit_dummy_query documentation.
 661  */
 662 static int vmw_fifo_emit_dummy_gb_query(struct vmw_private *dev_priv,
 663                                         uint32_t cid)
 664 {
 665         /*
 666          * A query wait without a preceding query end will
 667          * actually finish all queries for this cid
 668          * without writing to the query result structure.
 669          */
 670
 671         struct ttm_buffer_object *bo = &dev_priv->dummy_query_bo->base;
 672         struct {
 673                 SVGA3dCmdHeader header;
 674                 SVGA3dCmdWaitForGBQuery body;
 675         } *cmd;
 676
 677         cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
 678
 679         if (unlikely(cmd == NULL)) {
 680                 DRM_ERROR("Out of fifo space for dummy query.\n");
 681                 return -ENOMEM;
 682         }
 683
 684         cmd->header.id = SVGA_3D_CMD_WAIT_FOR_GB_QUERY;
 685         cmd->header.size = sizeof(cmd->body);
 686         cmd->body.cid = cid;
 687         cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
 688         BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
 689         cmd->body.mobid = bo->mem.start;
 690         cmd->body.offset = 0;
 691
 692         vmw_fifo_commit(dev_priv, sizeof(*cmd));
 693
 694         return 0;
 695 }
 696
 697
 698 /**
 699  * vmw_fifo_emit_dummy_gb_query - emits a dummy query to the fifo using
 700  * appropriate resource query commands.
 701  *
 702  * @dev_priv: The device private structure.
 703  * @cid: The hardware context id used for the query.
 704  *
 705  * This function is used to emit a dummy occlusion query with
 706  * no primitives rendered between query begin and query end.
 707  * It's used to provide a query barrier, in order to know that when
 708  * this query is finished, all preceding queries are also finished.
 709  *
 710  * A Query results structure should have been initialized at the start
 711  * of the dev_priv->dummy_query_bo buffer object. And that buffer object
 712  * must also be either reserved or pinned when this function is called.
 713  *
 714  * Returns -ENOMEM on failure to reserve fifo space.
 715  */
 716 int vmw_fifo_emit_dummy_query(struct vmw_private *dev_priv,
 717                               uint32_t cid)
 718 {
 719         if (dev_priv->has_mob)
 720                 return vmw_fifo_emit_dummy_gb_query(dev_priv, cid);
 721
 722         return vmw_fifo_emit_dummy_legacy_query(dev_priv, cid);
 723 }
 724
 725 void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes)
 726 {
 727         return vmw_fifo_reserve_dx(dev_priv, bytes, SVGA3D_INVALID_ID);
 728 }