drivers/gpu/drm/i915/intel_ringbuffer.c

   1 /*
   2  * Copyright © 2008-2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *    Zou Nan hai <nanhai.zou@intel.com>
  26  *    Xiang Hai hao<haihao.xiang@intel.com>
  27  *
  28  */
  29
  30 #include "drmP.h"
  31 #include "drm.h"
  32 #include "i915_drv.h"
  33 #include "i915_drm.h"
  34 #include "i915_trace.h"
  35 #include "intel_drv.h"
  36
  37 static inline int ring_space(struct intel_ring_buffer *ring)
  38 {
  39         int space = (ring->head & HEAD_ADDR) - (ring->tail + 8);
  40         if (space < 0)
  41                 space += ring->size;
  42         return space;
  43 }
  44
  45 static u32 i915_gem_get_seqno(struct drm_device *dev)
  46 {
  47         drm_i915_private_t *dev_priv = dev->dev_private;
  48         u32 seqno;
  49
  50         seqno = dev_priv->next_seqno;
  51
  52         /* reserve 0 for non-seqno */
  53         if (++dev_priv->next_seqno == 0)
  54                 dev_priv->next_seqno = 1;
  55
  56         return seqno;
  57 }
  58
  59 static int
  60 render_ring_flush(struct intel_ring_buffer *ring,
  61                   u32   invalidate_domains,
  62                   u32   flush_domains)
  63 {
  64         struct drm_device *dev = ring->dev;
  65         u32 cmd;
  66         int ret;
  67
  68         /*
  69          * read/write caches:
  70          *
  71          * I915_GEM_DOMAIN_RENDER is always invalidated, but is
  72          * only flushed if MI_NO_WRITE_FLUSH is unset.  On 965, it is
  73          * also flushed at 2d versus 3d pipeline switches.
  74          *
  75          * read-only caches:
  76          *
  77          * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
  78          * MI_READ_FLUSH is set, and is always flushed on 965.
  79          *
  80          * I915_GEM_DOMAIN_COMMAND may not exist?
  81          *
  82          * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
  83          * invalidated when MI_EXE_FLUSH is set.
  84          *
  85          * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
  86          * invalidated with every MI_FLUSH.
  87          *
  88          * TLBs:
  89          *
  90          * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
  91          * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
  92          * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
  93          * are flushed at any MI_FLUSH.
  94          */
  95
  96         cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
  97         if ((invalidate_domains|flush_domains) &
  98             I915_GEM_DOMAIN_RENDER)
  99                 cmd &= ~MI_NO_WRITE_FLUSH;
 100         if (INTEL_INFO(dev)->gen < 4) {
 101                 /*
 102                  * On the 965, the sampler cache always gets flushed
 103                  * and this bit is reserved.
 104                  */
 105                 if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)
 106                         cmd |= MI_READ_FLUSH;
 107         }
 108         if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)
 109                 cmd |= MI_EXE_FLUSH;
 110
 111         if (invalidate_domains & I915_GEM_DOMAIN_COMMAND &&
 112             (IS_G4X(dev) || IS_GEN5(dev)))
 113                 cmd |= MI_INVALIDATE_ISP;
 114
 115         ret = intel_ring_begin(ring, 2);
 116         if (ret)
 117                 return ret;
 118
 119         intel_ring_emit(ring, cmd);
 120         intel_ring_emit(ring, MI_NOOP);
 121         intel_ring_advance(ring);
 122
 123         return 0;
 124 }
 125
 126 static void ring_write_tail(struct intel_ring_buffer *ring,
 127                             u32 value)
 128 {
 129         drm_i915_private_t *dev_priv = ring->dev->dev_private;
 130         I915_WRITE_TAIL(ring, value);
 131 }
 132
 133 u32 intel_ring_get_active_head(struct intel_ring_buffer *ring)
 134 {
 135         drm_i915_private_t *dev_priv = ring->dev->dev_private;
 136         u32 acthd_reg = INTEL_INFO(ring->dev)->gen >= 4 ?
 137                         RING_ACTHD(ring->mmio_base) : ACTHD;
 138
 139         return I915_READ(acthd_reg);
 140 }
 141
 142 static int init_ring_common(struct intel_ring_buffer *ring)
 143 {
 144         drm_i915_private_t *dev_priv = ring->dev->dev_private;
 145         struct drm_i915_gem_object *obj = ring->obj;
 146         u32 head;
 147
 148         /* Stop the ring if it's running. */
 149         I915_WRITE_CTL(ring, 0);
 150         I915_WRITE_HEAD(ring, 0);
 151         ring->write_tail(ring, 0);
 152
 153         /* Initialize the ring. */
 154         I915_WRITE_START(ring, obj->gtt_offset);
 155         head = I915_READ_HEAD(ring) & HEAD_ADDR;
 156
 157         /* G45 ring initialization fails to reset head to zero */
 158         if (head != 0) {
 159                 DRM_DEBUG_KMS("%s head not reset to zero "
 160                               "ctl %08x head %08x tail %08x start %08x\n",
 161                               ring->name,
 162                               I915_READ_CTL(ring),
 163                               I915_READ_HEAD(ring),
 164                               I915_READ_TAIL(ring),
 165                               I915_READ_START(ring));
 166
 167                 I915_WRITE_HEAD(ring, 0);
 168
 169                 if (I915_READ_HEAD(ring) & HEAD_ADDR) {
 170                         DRM_ERROR("failed to set %s head to zero "
 171                                   "ctl %08x head %08x tail %08x start %08x\n",
 172                                   ring->name,
 173                                   I915_READ_CTL(ring),
 174                                   I915_READ_HEAD(ring),
 175                                   I915_READ_TAIL(ring),
 176                                   I915_READ_START(ring));
 177                 }
 178         }
 179
 180         I915_WRITE_CTL(ring,
 181                         ((ring->size - PAGE_SIZE) & RING_NR_PAGES)
 182                         | RING_REPORT_64K | RING_VALID);
 183
 184         /* If the head is still not zero, the ring is dead */
 185         if ((I915_READ_CTL(ring) & RING_VALID) == 0 ||
 186             I915_READ_START(ring) != obj->gtt_offset ||
 187             (I915_READ_HEAD(ring) & HEAD_ADDR) != 0) {
 188                 DRM_ERROR("%s initialization failed "
 189                                 "ctl %08x head %08x tail %08x start %08x\n",
 190                                 ring->name,
 191                                 I915_READ_CTL(ring),
 192                                 I915_READ_HEAD(ring),
 193                                 I915_READ_TAIL(ring),
 194                                 I915_READ_START(ring));
 195                 return -EIO;
 196         }
 197
 198         if (!drm_core_check_feature(ring->dev, DRIVER_MODESET))
 199                 i915_kernel_lost_context(ring->dev);
 200         else {
 201                 ring->head = I915_READ_HEAD(ring);
 202                 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
 203                 ring->space = ring_space(ring);
 204         }
 205
 206         return 0;
 207 }
 208
 209 /*
 210  * 965+ support PIPE_CONTROL commands, which provide finer grained control
 211  * over cache flushing.
 212  */
 213 struct pipe_control {
 214         struct drm_i915_gem_object *obj;
 215         volatile u32 *cpu_page;
 216         u32 gtt_offset;
 217 };
 218
 219 static int
 220 init_pipe_control(struct intel_ring_buffer *ring)
 221 {
 222         struct pipe_control *pc;
 223         struct drm_i915_gem_object *obj;
 224         int ret;
 225
 226         if (ring->private)
 227                 return 0;
 228
 229         pc = kmalloc(sizeof(*pc), GFP_KERNEL);
 230         if (!pc)
 231                 return -ENOMEM;
 232
 233         obj = i915_gem_alloc_object(ring->dev, 4096);
 234         if (obj == NULL) {
 235                 DRM_ERROR("Failed to allocate seqno page\n");
 236                 ret = -ENOMEM;
 237                 goto err;
 238         }
 239         obj->cache_level = I915_CACHE_LLC;
 240
 241         ret = i915_gem_object_pin(obj, 4096, true);
 242         if (ret)
 243                 goto err_unref;
 244
 245         pc->gtt_offset = obj->gtt_offset;
 246         pc->cpu_page =  kmap(obj->pages[0]);
 247         if (pc->cpu_page == NULL)
 248                 goto err_unpin;
 249
 250         pc->obj = obj;
 251         ring->private = pc;
 252         return 0;
 253
 254 err_unpin:
 255         i915_gem_object_unpin(obj);
 256 err_unref:
 257         drm_gem_object_unreference(&obj->base);
 258 err:
 259         kfree(pc);
 260         return ret;
 261 }
 262
 263 static void
 264 cleanup_pipe_control(struct intel_ring_buffer *ring)
 265 {
 266         struct pipe_control *pc = ring->private;
 267         struct drm_i915_gem_object *obj;
 268
 269         if (!ring->private)
 270                 return;
 271
 272         obj = pc->obj;
 273         kunmap(obj->pages[0]);
 274         i915_gem_object_unpin(obj);
 275         drm_gem_object_unreference(&obj->base);
 276
 277         kfree(pc);
 278         ring->private = NULL;
 279 }
 280
 281 static int init_render_ring(struct intel_ring_buffer *ring)
 282 {
 283         struct drm_device *dev = ring->dev;
 284         struct drm_i915_private *dev_priv = dev->dev_private;
 285         int ret = init_ring_common(ring);
 286
 287         if (INTEL_INFO(dev)->gen > 3) {
 288                 int mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;
 289                 if (IS_GEN6(dev) || IS_GEN7(dev))
 290                         mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
 291                 I915_WRITE(MI_MODE, mode);
 292         }
 293
 294         if (INTEL_INFO(dev)->gen >= 6) {
 295         } else if (IS_GEN5(dev)) {
 296                 ret = init_pipe_control(ring);
 297                 if (ret)
 298                         return ret;
 299         }
 300
 301         return ret;
 302 }
 303
 304 static void render_ring_cleanup(struct intel_ring_buffer *ring)
 305 {
 306         if (!ring->private)
 307                 return;
 308
 309         cleanup_pipe_control(ring);
 310 }
 311
 312 static void
 313 update_semaphore(struct intel_ring_buffer *ring, int i, u32 seqno)
 314 {
 315         struct drm_device *dev = ring->dev;
 316         struct drm_i915_private *dev_priv = dev->dev_private;
 317         int id;
 318
 319         /*
 320          * cs -> 1 = vcs, 0 = bcs
 321          * vcs -> 1 = bcs, 0 = cs,
 322          * bcs -> 1 = cs, 0 = vcs.
 323          */
 324         id = ring - dev_priv->ring;
 325         id += 2 - i;
 326         id %= 3;
 327
 328         intel_ring_emit(ring,
 329                         MI_SEMAPHORE_MBOX |
 330                         MI_SEMAPHORE_REGISTER |
 331                         MI_SEMAPHORE_UPDATE);
 332         intel_ring_emit(ring, seqno);
 333         intel_ring_emit(ring,
 334                         RING_SYNC_0(dev_priv->ring[id].mmio_base) + 4*i);
 335 }
 336
 337 static int
 338 gen6_add_request(struct intel_ring_buffer *ring,
 339                  u32 *result)
 340 {
 341         u32 seqno;
 342         int ret;
 343
 344         ret = intel_ring_begin(ring, 10);
 345         if (ret)
 346                 return ret;
 347
 348         seqno = i915_gem_get_seqno(ring->dev);
 349         update_semaphore(ring, 0, seqno);
 350         update_semaphore(ring, 1, seqno);
 351
 352         intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
 353         intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 354         intel_ring_emit(ring, seqno);
 355         intel_ring_emit(ring, MI_USER_INTERRUPT);
 356         intel_ring_advance(ring);
 357
 358         *result = seqno;
 359         return 0;
 360 }
 361
 362 int
 363 intel_ring_sync(struct intel_ring_buffer *ring,
 364                 struct intel_ring_buffer *to,
 365                 u32 seqno)
 366 {
 367         int ret;
 368
 369         ret = intel_ring_begin(ring, 4);
 370         if (ret)
 371                 return ret;
 372
 373         intel_ring_emit(ring,
 374                         MI_SEMAPHORE_MBOX |
 375                         MI_SEMAPHORE_REGISTER |
 376                         intel_ring_sync_index(ring, to) << 17 |
 377                         MI_SEMAPHORE_COMPARE);
 378         intel_ring_emit(ring, seqno);
 379         intel_ring_emit(ring, 0);
 380         intel_ring_emit(ring, MI_NOOP);
 381         intel_ring_advance(ring);
 382
 383         return 0;
 384 }
 385
 386 #define PIPE_CONTROL_FLUSH(ring__, addr__)                                      \
 387 do {                                                                    \
 388         intel_ring_emit(ring__, GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |           \
 389                  PIPE_CONTROL_DEPTH_STALL | 2);                         \
 390         intel_ring_emit(ring__, (addr__) | PIPE_CONTROL_GLOBAL_GTT);                    \
 391         intel_ring_emit(ring__, 0);                                                     \
 392         intel_ring_emit(ring__, 0);                                                     \
 393 } while (0)
 394
 395 static int
 396 pc_render_add_request(struct intel_ring_buffer *ring,
 397                       u32 *result)
 398 {
 399         struct drm_device *dev = ring->dev;
 400         u32 seqno = i915_gem_get_seqno(dev);
 401         struct pipe_control *pc = ring->private;
 402         u32 scratch_addr = pc->gtt_offset + 128;
 403         int ret;
 404
 405         /* For Ironlake, MI_USER_INTERRUPT was deprecated and apparently
 406          * incoherent with writes to memory, i.e. completely fubar,
 407          * so we need to use PIPE_NOTIFY instead.
 408          *
 409          * However, we also need to workaround the qword write
 410          * incoherence by flushing the 6 PIPE_NOTIFY buffers out to
 411          * memory before requesting an interrupt.
 412          */
 413         ret = intel_ring_begin(ring, 32);
 414         if (ret)
 415                 return ret;
 416
 417         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
 418                         PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH);
 419         intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
 420         intel_ring_emit(ring, seqno);
 421         intel_ring_emit(ring, 0);
 422         PIPE_CONTROL_FLUSH(ring, scratch_addr);
 423         scratch_addr += 128; /* write to separate cachelines */
 424         PIPE_CONTROL_FLUSH(ring, scratch_addr);
 425         scratch_addr += 128;
 426         PIPE_CONTROL_FLUSH(ring, scratch_addr);
 427         scratch_addr += 128;
 428         PIPE_CONTROL_FLUSH(ring, scratch_addr);
 429         scratch_addr += 128;
 430         PIPE_CONTROL_FLUSH(ring, scratch_addr);
 431         scratch_addr += 128;
 432         PIPE_CONTROL_FLUSH(ring, scratch_addr);
 433         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
 434                         PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH |
 435                         PIPE_CONTROL_NOTIFY);
 436         intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
 437         intel_ring_emit(ring, seqno);
 438         intel_ring_emit(ring, 0);
 439         intel_ring_advance(ring);
 440
 441         *result = seqno;
 442         return 0;
 443 }
 444
 445 static int
 446 render_ring_add_request(struct intel_ring_buffer *ring,
 447                         u32 *result)
 448 {
 449         struct drm_device *dev = ring->dev;
 450         u32 seqno = i915_gem_get_seqno(dev);
 451         int ret;
 452
 453         ret = intel_ring_begin(ring, 4);
 454         if (ret)
 455                 return ret;
 456
 457         intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
 458         intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 459         intel_ring_emit(ring, seqno);
 460         intel_ring_emit(ring, MI_USER_INTERRUPT);
 461         intel_ring_advance(ring);
 462
 463         *result = seqno;
 464         return 0;
 465 }
 466
 467 static u32
 468 ring_get_seqno(struct intel_ring_buffer *ring)
 469 {
 470         return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
 471 }
 472
 473 static u32
 474 pc_render_get_seqno(struct intel_ring_buffer *ring)
 475 {
 476         struct pipe_control *pc = ring->private;
 477         return pc->cpu_page[0];
 478 }
 479
 480 static void
 481 ironlake_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
 482 {
 483         dev_priv->gt_irq_mask &= ~mask;
 484         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
 485         POSTING_READ(GTIMR);
 486 }
 487
 488 static void
 489 ironlake_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
 490 {
 491         dev_priv->gt_irq_mask |= mask;
 492         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
 493         POSTING_READ(GTIMR);
 494 }
 495
 496 static void
 497 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
 498 {
 499         dev_priv->irq_mask &= ~mask;
 500         I915_WRITE(IMR, dev_priv->irq_mask);
 501         POSTING_READ(IMR);
 502 }
 503
 504 static void
 505 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
 506 {
 507         dev_priv->irq_mask |= mask;
 508         I915_WRITE(IMR, dev_priv->irq_mask);
 509         POSTING_READ(IMR);
 510 }
 511
 512 static bool
 513 render_ring_get_irq(struct intel_ring_buffer *ring)
 514 {
 515         struct drm_device *dev = ring->dev;
 516         drm_i915_private_t *dev_priv = dev->dev_private;
 517
 518         if (!dev->irq_enabled)
 519                 return false;
 520
 521         spin_lock(&ring->irq_lock);
 522         if (ring->irq_refcount++ == 0) {
 523                 if (HAS_PCH_SPLIT(dev))
 524                         ironlake_enable_irq(dev_priv,
 525                                             GT_PIPE_NOTIFY | GT_USER_INTERRUPT);
 526                 else
 527                         i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
 528         }
 529         spin_unlock(&ring->irq_lock);
 530
 531         return true;
 532 }
 533
 534 static void
 535 render_ring_put_irq(struct intel_ring_buffer *ring)
 536 {
 537         struct drm_device *dev = ring->dev;
 538         drm_i915_private_t *dev_priv = dev->dev_private;
 539
 540         spin_lock(&ring->irq_lock);
 541         if (--ring->irq_refcount == 0) {
 542                 if (HAS_PCH_SPLIT(dev))
 543                         ironlake_disable_irq(dev_priv,
 544                                              GT_USER_INTERRUPT |
 545                                              GT_PIPE_NOTIFY);
 546                 else
 547                         i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
 548         }
 549         spin_unlock(&ring->irq_lock);
 550 }
 551
 552 void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
 553 {
 554         struct drm_device *dev = ring->dev;
 555         drm_i915_private_t *dev_priv = ring->dev->dev_private;
 556         u32 mmio = 0;
 557
 558         /* The ring status page addresses are no longer next to the rest of
 559          * the ring registers as of gen7.
 560          */
 561         if (IS_GEN7(dev)) {
 562                 switch (ring->id) {
 563                 case RING_RENDER:
 564                         mmio = RENDER_HWS_PGA_GEN7;
 565                         break;
 566                 case RING_BLT:
 567                         mmio = BLT_HWS_PGA_GEN7;
 568                         break;
 569                 case RING_BSD:
 570                         mmio = BSD_HWS_PGA_GEN7;
 571                         break;
 572                 }
 573         } else if (IS_GEN6(ring->dev)) {
 574                 mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
 575         } else {
 576                 mmio = RING_HWS_PGA(ring->mmio_base);
 577         }
 578
 579         I915_WRITE(mmio, (u32)ring->status_page.gfx_addr);
 580         POSTING_READ(mmio);
 581 }
 582
 583 static int
 584 bsd_ring_flush(struct intel_ring_buffer *ring,
 585                u32     invalidate_domains,
 586                u32     flush_domains)
 587 {
 588         int ret;
 589
 590         ret = intel_ring_begin(ring, 2);
 591         if (ret)
 592                 return ret;
 593
 594         intel_ring_emit(ring, MI_FLUSH);
 595         intel_ring_emit(ring, MI_NOOP);
 596         intel_ring_advance(ring);
 597         return 0;
 598 }
 599
 600 static int
 601 ring_add_request(struct intel_ring_buffer *ring,
 602                  u32 *result)
 603 {
 604         u32 seqno;
 605         int ret;
 606
 607         ret = intel_ring_begin(ring, 4);
 608         if (ret)
 609                 return ret;
 610
 611         seqno = i915_gem_get_seqno(ring->dev);
 612
 613         intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
 614         intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 615         intel_ring_emit(ring, seqno);
 616         intel_ring_emit(ring, MI_USER_INTERRUPT);
 617         intel_ring_advance(ring);
 618
 619         *result = seqno;
 620         return 0;
 621 }
 622
 623 static bool
 624 gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
 625 {
 626         struct drm_device *dev = ring->dev;
 627         drm_i915_private_t *dev_priv = dev->dev_private;
 628
 629         if (!dev->irq_enabled)
 630                return false;
 631
 632         spin_lock(&ring->irq_lock);
 633         if (ring->irq_refcount++ == 0) {
 634                 ring->irq_mask &= ~rflag;
 635                 I915_WRITE_IMR(ring, ring->irq_mask);
 636                 ironlake_enable_irq(dev_priv, gflag);
 637         }
 638         spin_unlock(&ring->irq_lock);
 639
 640         return true;
 641 }
 642
 643 static void
 644 gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
 645 {
 646         struct drm_device *dev = ring->dev;
 647         drm_i915_private_t *dev_priv = dev->dev_private;
 648
 649         spin_lock(&ring->irq_lock);
 650         if (--ring->irq_refcount == 0) {
 651                 ring->irq_mask |= rflag;
 652                 I915_WRITE_IMR(ring, ring->irq_mask);
 653                 ironlake_disable_irq(dev_priv, gflag);
 654         }
 655         spin_unlock(&ring->irq_lock);
 656 }
 657
 658 static bool
 659 bsd_ring_get_irq(struct intel_ring_buffer *ring)
 660 {
 661         struct drm_device *dev = ring->dev;
 662         drm_i915_private_t *dev_priv = dev->dev_private;
 663
 664         if (!dev->irq_enabled)
 665                 return false;
 666
 667         spin_lock(&ring->irq_lock);
 668         if (ring->irq_refcount++ == 0) {
 669                 if (IS_G4X(dev))
 670                         i915_enable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
 671                 else
 672                         ironlake_enable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
 673         }
 674         spin_unlock(&ring->irq_lock);
 675
 676         return true;
 677 }
 678 static void
 679 bsd_ring_put_irq(struct intel_ring_buffer *ring)
 680 {
 681         struct drm_device *dev = ring->dev;
 682         drm_i915_private_t *dev_priv = dev->dev_private;
 683
 684         spin_lock(&ring->irq_lock);
 685         if (--ring->irq_refcount == 0) {
 686                 if (IS_G4X(dev))
 687                         i915_disable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
 688                 else
 689                         ironlake_disable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
 690         }
 691         spin_unlock(&ring->irq_lock);
 692 }
 693
 694 static int
 695 ring_dispatch_execbuffer(struct intel_ring_buffer *ring, u32 offset, u32 length)
 696 {
 697         int ret;
 698
 699         ret = intel_ring_begin(ring, 2);
 700         if (ret)
 701                 return ret;
 702
 703         intel_ring_emit(ring,
 704                         MI_BATCH_BUFFER_START | (2 << 6) |
 705                         MI_BATCH_NON_SECURE_I965);
 706         intel_ring_emit(ring, offset);
 707         intel_ring_advance(ring);
 708
 709         return 0;
 710 }
 711
 712 static int
 713 render_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
 714                                 u32 offset, u32 len)
 715 {
 716         struct drm_device *dev = ring->dev;
 717         int ret;
 718
 719         if (IS_I830(dev) || IS_845G(dev)) {
 720                 ret = intel_ring_begin(ring, 4);
 721                 if (ret)
 722                         return ret;
 723
 724                 intel_ring_emit(ring, MI_BATCH_BUFFER);
 725                 intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
 726                 intel_ring_emit(ring, offset + len - 8);
 727                 intel_ring_emit(ring, 0);
 728         } else {
 729                 ret = intel_ring_begin(ring, 2);
 730                 if (ret)
 731                         return ret;
 732
 733                 if (INTEL_INFO(dev)->gen >= 4) {
 734                         intel_ring_emit(ring,
 735                                         MI_BATCH_BUFFER_START | (2 << 6) |
 736                                         MI_BATCH_NON_SECURE_I965);
 737                         intel_ring_emit(ring, offset);
 738                 } else {
 739                         intel_ring_emit(ring,
 740                                         MI_BATCH_BUFFER_START | (2 << 6));
 741                         intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
 742                 }
 743         }
 744         intel_ring_advance(ring);
 745
 746         return 0;
 747 }
 748
 749 static void cleanup_status_page(struct intel_ring_buffer *ring)
 750 {
 751         drm_i915_private_t *dev_priv = ring->dev->dev_private;
 752         struct drm_i915_gem_object *obj;
 753
 754         obj = ring->status_page.obj;
 755         if (obj == NULL)
 756                 return;
 757
 758         kunmap(obj->pages[0]);
 759         i915_gem_object_unpin(obj);
 760         drm_gem_object_unreference(&obj->base);
 761         ring->status_page.obj = NULL;
 762
 763         memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
 764 }
 765
 766 static int init_status_page(struct intel_ring_buffer *ring)
 767 {
 768         struct drm_device *dev = ring->dev;
 769         drm_i915_private_t *dev_priv = dev->dev_private;
 770         struct drm_i915_gem_object *obj;
 771         int ret;
 772
 773         obj = i915_gem_alloc_object(dev, 4096);
 774         if (obj == NULL) {
 775                 DRM_ERROR("Failed to allocate status page\n");
 776                 ret = -ENOMEM;
 777                 goto err;
 778         }
 779         obj->cache_level = I915_CACHE_LLC;
 780
 781         ret = i915_gem_object_pin(obj, 4096, true);
 782         if (ret != 0) {
 783                 goto err_unref;
 784         }
 785
 786         ring->status_page.gfx_addr = obj->gtt_offset;
 787         ring->status_page.page_addr = kmap(obj->pages[0]);
 788         if (ring->status_page.page_addr == NULL) {
 789                 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
 790                 goto err_unpin;
 791         }
 792         ring->status_page.obj = obj;
 793         memset(ring->status_page.page_addr, 0, PAGE_SIZE);
 794
 795         intel_ring_setup_status_page(ring);
 796         DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
 797                         ring->name, ring->status_page.gfx_addr);
 798
 799         return 0;
 800
 801 err_unpin:
 802         i915_gem_object_unpin(obj);
 803 err_unref:
 804         drm_gem_object_unreference(&obj->base);
 805 err:
 806         return ret;
 807 }
 808
 809 int intel_init_ring_buffer(struct drm_device *dev,
 810                            struct intel_ring_buffer *ring)
 811 {
 812         struct drm_i915_gem_object *obj;
 813         int ret;
 814
 815         ring->dev = dev;
 816         INIT_LIST_HEAD(&ring->active_list);
 817         INIT_LIST_HEAD(&ring->request_list);
 818         INIT_LIST_HEAD(&ring->gpu_write_list);
 819
 820         init_waitqueue_head(&ring->irq_queue);
 821         spin_lock_init(&ring->irq_lock);
 822         ring->irq_mask = ~0;
 823
 824         if (I915_NEED_GFX_HWS(dev)) {
 825                 ret = init_status_page(ring);
 826                 if (ret)
 827                         return ret;
 828         }
 829
 830         obj = i915_gem_alloc_object(dev, ring->size);
 831         if (obj == NULL) {
 832                 DRM_ERROR("Failed to allocate ringbuffer\n");
 833                 ret = -ENOMEM;
 834                 goto err_hws;
 835         }
 836
 837         ring->obj = obj;
 838
 839         ret = i915_gem_object_pin(obj, PAGE_SIZE, true);
 840         if (ret)
 841                 goto err_unref;
 842
 843         ring->map.size = ring->size;
 844         ring->map.offset = dev->agp->base + obj->gtt_offset;
 845         ring->map.type = 0;
 846         ring->map.flags = 0;
 847         ring->map.mtrr = 0;
 848
 849         drm_core_ioremap_wc(&ring->map, dev);
 850         if (ring->map.handle == NULL) {
 851                 DRM_ERROR("Failed to map ringbuffer.\n");
 852                 ret = -EINVAL;
 853                 goto err_unpin;
 854         }
 855
 856         ring->virtual_start = ring->map.handle;
 857         ret = ring->init(ring);
 858         if (ret)
 859                 goto err_unmap;
 860
 861         /* Workaround an erratum on the i830 which causes a hang if
 862          * the TAIL pointer points to within the last 2 cachelines
 863          * of the buffer.
 864          */
 865         ring->effective_size = ring->size;
 866         if (IS_I830(ring->dev))
 867                 ring->effective_size -= 128;
 868
 869         return 0;
 870
 871 err_unmap:
 872         drm_core_ioremapfree(&ring->map, dev);
 873 err_unpin:
 874         i915_gem_object_unpin(obj);
 875 err_unref:
 876         drm_gem_object_unreference(&obj->base);
 877         ring->obj = NULL;
 878 err_hws:
 879         cleanup_status_page(ring);
 880         return ret;
 881 }
 882
 883 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring)
 884 {
 885         struct drm_i915_private *dev_priv;
 886         int ret;
 887
 888         if (ring->obj == NULL)
 889                 return;
 890
 891         /* Disable the ring buffer. The ring must be idle at this point */
 892         dev_priv = ring->dev->dev_private;
 893         ret = intel_wait_ring_idle(ring);
 894         if (ret)
 895                 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
 896                           ring->name, ret);
 897
 898         I915_WRITE_CTL(ring, 0);
 899
 900         drm_core_ioremapfree(&ring->map, ring->dev);
 901
 902         i915_gem_object_unpin(ring->obj);
 903         drm_gem_object_unreference(&ring->obj->base);
 904         ring->obj = NULL;
 905
 906         if (ring->cleanup)
 907                 ring->cleanup(ring);
 908
 909         cleanup_status_page(ring);
 910 }
 911
 912 static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring)
 913 {
 914         unsigned int *virt;
 915         int rem = ring->size - ring->tail;
 916
 917         if (ring->space < rem) {
 918                 int ret = intel_wait_ring_buffer(ring, rem);
 919                 if (ret)
 920                         return ret;
 921         }
 922
 923         virt = (unsigned int *)(ring->virtual_start + ring->tail);
 924         rem /= 8;
 925         while (rem--) {
 926                 *virt++ = MI_NOOP;
 927                 *virt++ = MI_NOOP;
 928         }
 929
 930         ring->tail = 0;
 931         ring->space = ring_space(ring);
 932
 933         return 0;
 934 }
 935
 936 int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n)
 937 {
 938         struct drm_device *dev = ring->dev;
 939         struct drm_i915_private *dev_priv = dev->dev_private;
 940         unsigned long end;
 941         u32 head;
 942
 943         /* If the reported head position has wrapped or hasn't advanced,
 944          * fallback to the slow and accurate path.
 945          */
 946         head = intel_read_status_page(ring, 4);
 947         if (head > ring->head) {
 948                 ring->head = head;
 949                 ring->space = ring_space(ring);
 950                 if (ring->space >= n)
 951                         return 0;
 952         }
 953
 954         trace_i915_ring_wait_begin(ring);
 955         end = jiffies + 3 * HZ;
 956         do {
 957                 ring->head = I915_READ_HEAD(ring);
 958                 ring->space = ring_space(ring);
 959                 if (ring->space >= n) {
 960                         trace_i915_ring_wait_end(ring);
 961                         return 0;
 962                 }
 963
 964                 if (dev->primary->master) {
 965                         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 966                         if (master_priv->sarea_priv)
 967                                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 968                 }
 969
 970                 msleep(1);
 971                 if (atomic_read(&dev_priv->mm.wedged))
 972                         return -EAGAIN;
 973         } while (!time_after(jiffies, end));
 974         trace_i915_ring_wait_end(ring);
 975         return -EBUSY;
 976 }
 977
 978 int intel_ring_begin(struct intel_ring_buffer *ring,
 979                      int num_dwords)
 980 {
 981         struct drm_i915_private *dev_priv = ring->dev->dev_private;
 982         int n = 4*num_dwords;
 983         int ret;
 984
 985         if (unlikely(atomic_read(&dev_priv->mm.wedged)))
 986                 return -EIO;
 987
 988         if (unlikely(ring->tail + n > ring->effective_size)) {
 989                 ret = intel_wrap_ring_buffer(ring);
 990                 if (unlikely(ret))
 991                         return ret;
 992         }
 993
 994         if (unlikely(ring->space < n)) {
 995                 ret = intel_wait_ring_buffer(ring, n);
 996                 if (unlikely(ret))
 997                         return ret;
 998         }
 999
1000         ring->space -= n;
1001         return 0;
1002 }
1003
1004 void intel_ring_advance(struct intel_ring_buffer *ring)
1005 {
1006         ring->tail &= ring->size - 1;
1007         ring->write_tail(ring, ring->tail);
1008 }
1009
1010 static const struct intel_ring_buffer render_ring = {
1011         .name                   = "render ring",
1012         .id                     = RING_RENDER,
1013         .mmio_base              = RENDER_RING_BASE,
1014         .size                   = 32 * PAGE_SIZE,
1015         .init                   = init_render_ring,
1016         .write_tail             = ring_write_tail,
1017         .flush                  = render_ring_flush,
1018         .add_request            = render_ring_add_request,
1019         .get_seqno              = ring_get_seqno,
1020         .irq_get                = render_ring_get_irq,
1021         .irq_put                = render_ring_put_irq,
1022         .dispatch_execbuffer    = render_ring_dispatch_execbuffer,
1023        .cleanup                 = render_ring_cleanup,
1024 };
1025
1026 /* ring buffer for bit-stream decoder */
1027
1028 static const struct intel_ring_buffer bsd_ring = {
1029         .name                   = "bsd ring",
1030         .id                     = RING_BSD,
1031         .mmio_base              = BSD_RING_BASE,
1032         .size                   = 32 * PAGE_SIZE,
1033         .init                   = init_ring_common,
1034         .write_tail             = ring_write_tail,
1035         .flush                  = bsd_ring_flush,
1036         .add_request            = ring_add_request,
1037         .get_seqno              = ring_get_seqno,
1038         .irq_get                = bsd_ring_get_irq,
1039         .irq_put                = bsd_ring_put_irq,
1040         .dispatch_execbuffer    = ring_dispatch_execbuffer,
1041 };
1042
1043
1044 static void gen6_bsd_ring_write_tail(struct intel_ring_buffer *ring,
1045                                      u32 value)
1046 {
1047        drm_i915_private_t *dev_priv = ring->dev->dev_private;
1048
1049        /* Every tail move must follow the sequence below */
1050        I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
1051                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
1052                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE);
1053        I915_WRITE(GEN6_BSD_RNCID, 0x0);
1054
1055        if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
1056                                GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR) == 0,
1057                        50))
1058                DRM_ERROR("timed out waiting for IDLE Indicator\n");
1059
1060        I915_WRITE_TAIL(ring, value);
1061        I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
1062                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
1063                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE);
1064 }
1065
1066 static int gen6_ring_flush(struct intel_ring_buffer *ring,
1067                            u32 invalidate, u32 flush)
1068 {
1069         uint32_t cmd;
1070         int ret;
1071
1072         ret = intel_ring_begin(ring, 4);
1073         if (ret)
1074                 return ret;
1075
1076         cmd = MI_FLUSH_DW;
1077         if (invalidate & I915_GEM_GPU_DOMAINS)
1078                 cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD;
1079         intel_ring_emit(ring, cmd);
1080         intel_ring_emit(ring, 0);
1081         intel_ring_emit(ring, 0);
1082         intel_ring_emit(ring, MI_NOOP);
1083         intel_ring_advance(ring);
1084         return 0;
1085 }
1086
1087 static int
1088 gen6_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
1089                               u32 offset, u32 len)
1090 {
1091        int ret;
1092
1093        ret = intel_ring_begin(ring, 2);
1094        if (ret)
1095                return ret;
1096
1097        intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_NON_SECURE_I965);
1098        /* bit0-7 is the length on GEN6+ */
1099        intel_ring_emit(ring, offset);
1100        intel_ring_advance(ring);
1101
1102        return 0;
1103 }
1104
1105 static bool
1106 gen6_render_ring_get_irq(struct intel_ring_buffer *ring)
1107 {
1108         return gen6_ring_get_irq(ring,
1109                                  GT_USER_INTERRUPT,
1110                                  GEN6_RENDER_USER_INTERRUPT);
1111 }
1112
1113 static void
1114 gen6_render_ring_put_irq(struct intel_ring_buffer *ring)
1115 {
1116         return gen6_ring_put_irq(ring,
1117                                  GT_USER_INTERRUPT,
1118                                  GEN6_RENDER_USER_INTERRUPT);
1119 }
1120
1121 static bool
1122 gen6_bsd_ring_get_irq(struct intel_ring_buffer *ring)
1123 {
1124         return gen6_ring_get_irq(ring,
1125                                  GT_GEN6_BSD_USER_INTERRUPT,
1126                                  GEN6_BSD_USER_INTERRUPT);
1127 }
1128
1129 static void
1130 gen6_bsd_ring_put_irq(struct intel_ring_buffer *ring)
1131 {
1132         return gen6_ring_put_irq(ring,
1133                                  GT_GEN6_BSD_USER_INTERRUPT,
1134                                  GEN6_BSD_USER_INTERRUPT);
1135 }
1136
1137 /* ring buffer for Video Codec for Gen6+ */
1138 static const struct intel_ring_buffer gen6_bsd_ring = {
1139         .name                   = "gen6 bsd ring",
1140         .id                     = RING_BSD,
1141         .mmio_base              = GEN6_BSD_RING_BASE,
1142         .size                   = 32 * PAGE_SIZE,
1143         .init                   = init_ring_common,
1144         .write_tail             = gen6_bsd_ring_write_tail,
1145         .flush                  = gen6_ring_flush,
1146         .add_request            = gen6_add_request,
1147         .get_seqno              = ring_get_seqno,
1148         .irq_get                = gen6_bsd_ring_get_irq,
1149         .irq_put                = gen6_bsd_ring_put_irq,
1150         .dispatch_execbuffer    = gen6_ring_dispatch_execbuffer,
1151 };
1152
1153 /* Blitter support (SandyBridge+) */
1154
1155 static bool
1156 blt_ring_get_irq(struct intel_ring_buffer *ring)
1157 {
1158         return gen6_ring_get_irq(ring,
1159                                  GT_BLT_USER_INTERRUPT,
1160                                  GEN6_BLITTER_USER_INTERRUPT);
1161 }
1162
1163 static void
1164 blt_ring_put_irq(struct intel_ring_buffer *ring)
1165 {
1166         gen6_ring_put_irq(ring,
1167                           GT_BLT_USER_INTERRUPT,
1168                           GEN6_BLITTER_USER_INTERRUPT);
1169 }
1170
1171
1172 /* Workaround for some stepping of SNB,
1173  * each time when BLT engine ring tail moved,
1174  * the first command in the ring to be parsed
1175  * should be MI_BATCH_BUFFER_START
1176  */
1177 #define NEED_BLT_WORKAROUND(dev) \
1178         (IS_GEN6(dev) && (dev->pdev->revision < 8))
1179
1180 static inline struct drm_i915_gem_object *
1181 to_blt_workaround(struct intel_ring_buffer *ring)
1182 {
1183         return ring->private;
1184 }
1185
1186 static int blt_ring_init(struct intel_ring_buffer *ring)
1187 {
1188         if (NEED_BLT_WORKAROUND(ring->dev)) {
1189                 struct drm_i915_gem_object *obj;
1190                 u32 *ptr;
1191                 int ret;
1192
1193                 obj = i915_gem_alloc_object(ring->dev, 4096);
1194                 if (obj == NULL)
1195                         return -ENOMEM;
1196
1197                 ret = i915_gem_object_pin(obj, 4096, true);
1198                 if (ret) {
1199                         drm_gem_object_unreference(&obj->base);
1200                         return ret;
1201                 }
1202
1203                 ptr = kmap(obj->pages[0]);
1204                 *ptr++ = MI_BATCH_BUFFER_END;
1205                 *ptr++ = MI_NOOP;
1206                 kunmap(obj->pages[0]);
1207
1208                 ret = i915_gem_object_set_to_gtt_domain(obj, false);
1209                 if (ret) {
1210                         i915_gem_object_unpin(obj);
1211                         drm_gem_object_unreference(&obj->base);
1212                         return ret;
1213                 }
1214
1215                 ring->private = obj;
1216         }
1217
1218         return init_ring_common(ring);
1219 }
1220
1221 static int blt_ring_begin(struct intel_ring_buffer *ring,
1222                           int num_dwords)
1223 {
1224         if (ring->private) {
1225                 int ret = intel_ring_begin(ring, num_dwords+2);
1226                 if (ret)
1227                         return ret;
1228
1229                 intel_ring_emit(ring, MI_BATCH_BUFFER_START);
1230                 intel_ring_emit(ring, to_blt_workaround(ring)->gtt_offset);
1231
1232                 return 0;
1233         } else
1234                 return intel_ring_begin(ring, 4);
1235 }
1236
1237 static int blt_ring_flush(struct intel_ring_buffer *ring,
1238                           u32 invalidate, u32 flush)
1239 {
1240         uint32_t cmd;
1241         int ret;
1242
1243         ret = blt_ring_begin(ring, 4);
1244         if (ret)
1245                 return ret;
1246
1247         cmd = MI_FLUSH_DW;
1248         if (invalidate & I915_GEM_DOMAIN_RENDER)
1249                 cmd |= MI_INVALIDATE_TLB;
1250         intel_ring_emit(ring, cmd);
1251         intel_ring_emit(ring, 0);
1252         intel_ring_emit(ring, 0);
1253         intel_ring_emit(ring, MI_NOOP);
1254         intel_ring_advance(ring);
1255         return 0;
1256 }
1257
1258 static void blt_ring_cleanup(struct intel_ring_buffer *ring)
1259 {
1260         if (!ring->private)
1261                 return;
1262
1263         i915_gem_object_unpin(ring->private);
1264         drm_gem_object_unreference(ring->private);
1265         ring->private = NULL;
1266 }
1267
1268 static const struct intel_ring_buffer gen6_blt_ring = {
1269        .name                    = "blt ring",
1270        .id                      = RING_BLT,
1271        .mmio_base               = BLT_RING_BASE,
1272        .size                    = 32 * PAGE_SIZE,
1273        .init                    = blt_ring_init,
1274        .write_tail              = ring_write_tail,
1275        .flush                   = blt_ring_flush,
1276        .add_request             = gen6_add_request,
1277        .get_seqno               = ring_get_seqno,
1278        .irq_get                 = blt_ring_get_irq,
1279        .irq_put                 = blt_ring_put_irq,
1280        .dispatch_execbuffer     = gen6_ring_dispatch_execbuffer,
1281        .cleanup                 = blt_ring_cleanup,
1282 };
1283
1284 int intel_init_render_ring_buffer(struct drm_device *dev)
1285 {
1286         drm_i915_private_t *dev_priv = dev->dev_private;
1287         struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
1288
1289         *ring = render_ring;
1290         if (INTEL_INFO(dev)->gen >= 6) {
1291                 ring->add_request = gen6_add_request;
1292                 ring->irq_get = gen6_render_ring_get_irq;
1293                 ring->irq_put = gen6_render_ring_put_irq;
1294         } else if (IS_GEN5(dev)) {
1295                 ring->add_request = pc_render_add_request;
1296                 ring->get_seqno = pc_render_get_seqno;
1297         }
1298
1299         if (!I915_NEED_GFX_HWS(dev)) {
1300                 ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
1301                 memset(ring->status_page.page_addr, 0, PAGE_SIZE);
1302         }
1303
1304         return intel_init_ring_buffer(dev, ring);
1305 }
1306
1307 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size)
1308 {
1309         drm_i915_private_t *dev_priv = dev->dev_private;
1310         struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
1311
1312         *ring = render_ring;
1313         if (INTEL_INFO(dev)->gen >= 6) {
1314                 ring->add_request = gen6_add_request;
1315                 ring->irq_get = gen6_render_ring_get_irq;
1316                 ring->irq_put = gen6_render_ring_put_irq;
1317         } else if (IS_GEN5(dev)) {
1318                 ring->add_request = pc_render_add_request;
1319                 ring->get_seqno = pc_render_get_seqno;
1320         }
1321
1322         ring->dev = dev;
1323         INIT_LIST_HEAD(&ring->active_list);
1324         INIT_LIST_HEAD(&ring->request_list);
1325         INIT_LIST_HEAD(&ring->gpu_write_list);
1326
1327         ring->size = size;
1328         ring->effective_size = ring->size;
1329         if (IS_I830(ring->dev))
1330                 ring->effective_size -= 128;
1331
1332         ring->map.offset = start;
1333         ring->map.size = size;
1334         ring->map.type = 0;
1335         ring->map.flags = 0;
1336         ring->map.mtrr = 0;
1337
1338         drm_core_ioremap_wc(&ring->map, dev);
1339         if (ring->map.handle == NULL) {
1340                 DRM_ERROR("can not ioremap virtual address for"
1341                           " ring buffer\n");
1342                 return -ENOMEM;
1343         }
1344
1345         ring->virtual_start = (void __force __iomem *)ring->map.handle;
1346         return 0;
1347 }
1348
1349 int intel_init_bsd_ring_buffer(struct drm_device *dev)
1350 {
1351         drm_i915_private_t *dev_priv = dev->dev_private;
1352         struct intel_ring_buffer *ring = &dev_priv->ring[VCS];
1353
1354         if (IS_GEN6(dev) || IS_GEN7(dev))
1355                 *ring = gen6_bsd_ring;
1356         else
1357                 *ring = bsd_ring;
1358
1359         return intel_init_ring_buffer(dev, ring);
1360 }
1361
1362 int intel_init_blt_ring_buffer(struct drm_device *dev)
1363 {
1364         drm_i915_private_t *dev_priv = dev->dev_private;
1365         struct intel_ring_buffer *ring = &dev_priv->ring[BCS];
1366
1367         *ring = gen6_blt_ring;
1368
1369         return intel_init_ring_buffer(dev, ring);
1370 }