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 u32 i915_gem_get_seqno(struct drm_device *dev)
  38 {
  39         drm_i915_private_t *dev_priv = dev->dev_private;
  40         u32 seqno;
  41
  42         seqno = dev_priv->next_seqno;
  43
  44         /* reserve 0 for non-seqno */
  45         if (++dev_priv->next_seqno == 0)
  46                 dev_priv->next_seqno = 1;
  47
  48         return seqno;
  49 }
  50
  51 static void
  52 render_ring_flush(struct drm_device *dev,
  53                   struct intel_ring_buffer *ring,
  54                   u32   invalidate_domains,
  55                   u32   flush_domains)
  56 {
  57         drm_i915_private_t *dev_priv = dev->dev_private;
  58         u32 cmd;
  59
  60 #if WATCH_EXEC
  61         DRM_INFO("%s: invalidate %08x flush %08x\n", __func__,
  62                   invalidate_domains, flush_domains);
  63 #endif
  64
  65         trace_i915_gem_request_flush(dev, dev_priv->next_seqno,
  66                                      invalidate_domains, flush_domains);
  67
  68         if ((invalidate_domains | flush_domains) & I915_GEM_GPU_DOMAINS) {
  69                 /*
  70                  * read/write caches:
  71                  *
  72                  * I915_GEM_DOMAIN_RENDER is always invalidated, but is
  73                  * only flushed if MI_NO_WRITE_FLUSH is unset.  On 965, it is
  74                  * also flushed at 2d versus 3d pipeline switches.
  75                  *
  76                  * read-only caches:
  77                  *
  78                  * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
  79                  * MI_READ_FLUSH is set, and is always flushed on 965.
  80                  *
  81                  * I915_GEM_DOMAIN_COMMAND may not exist?
  82                  *
  83                  * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
  84                  * invalidated when MI_EXE_FLUSH is set.
  85                  *
  86                  * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
  87                  * invalidated with every MI_FLUSH.
  88                  *
  89                  * TLBs:
  90                  *
  91                  * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
  92                  * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
  93                  * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
  94                  * are flushed at any MI_FLUSH.
  95                  */
  96
  97                 cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
  98                 if ((invalidate_domains|flush_domains) &
  99                     I915_GEM_DOMAIN_RENDER)
 100                         cmd &= ~MI_NO_WRITE_FLUSH;
 101                 if (INTEL_INFO(dev)->gen < 4) {
 102                         /*
 103                          * On the 965, the sampler cache always gets flushed
 104                          * and this bit is reserved.
 105                          */
 106                         if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)
 107                                 cmd |= MI_READ_FLUSH;
 108                 }
 109                 if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)
 110                         cmd |= MI_EXE_FLUSH;
 111
 112 #if WATCH_EXEC
 113                 DRM_INFO("%s: queue flush %08x to ring\n", __func__, cmd);
 114 #endif
 115                 intel_ring_begin(dev, ring, 2);
 116                 intel_ring_emit(dev, ring, cmd);
 117                 intel_ring_emit(dev, ring, MI_NOOP);
 118                 intel_ring_advance(dev, ring);
 119         }
 120 }
 121
 122 static void ring_set_tail(struct drm_device *dev,
 123                           struct intel_ring_buffer *ring,
 124                           u32 value)
 125 {
 126         drm_i915_private_t *dev_priv = dev->dev_private;
 127         I915_WRITE_TAIL(ring, ring->tail);
 128 }
 129
 130 u32 intel_ring_get_active_head(struct drm_device *dev,
 131                                struct intel_ring_buffer *ring)
 132 {
 133         drm_i915_private_t *dev_priv = dev->dev_private;
 134         u32 acthd_reg = INTEL_INFO(dev)->gen >= 4 ?
 135                         RING_ACTHD(ring->mmio_base) : ACTHD;
 136
 137         return I915_READ(acthd_reg);
 138 }
 139
 140 static int init_ring_common(struct drm_device *dev,
 141                             struct intel_ring_buffer *ring)
 142 {
 143         u32 head;
 144         drm_i915_private_t *dev_priv = dev->dev_private;
 145         struct drm_i915_gem_object *obj_priv;
 146         obj_priv = to_intel_bo(ring->gem_object);
 147
 148         /* Stop the ring if it's running. */
 149         I915_WRITE_CTL(ring, 0);
 150         I915_WRITE_HEAD(ring, 0);
 151         ring->set_tail(dev, ring, 0);
 152
 153         /* Initialize the ring. */
 154         I915_WRITE_START(ring, obj_priv->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_ERROR("%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                 DRM_ERROR("%s head forced to zero "
 170                                 "ctl %08x head %08x tail %08x start %08x\n",
 171                                 ring->name,
 172                                 I915_READ_CTL(ring),
 173                                 I915_READ_HEAD(ring),
 174                                 I915_READ_TAIL(ring),
 175                                 I915_READ_START(ring));
 176         }
 177
 178         I915_WRITE_CTL(ring,
 179                         ((ring->gem_object->size - PAGE_SIZE) & RING_NR_PAGES)
 180                         | RING_NO_REPORT | RING_VALID);
 181
 182         head = I915_READ_HEAD(ring) & HEAD_ADDR;
 183         /* If the head is still not zero, the ring is dead */
 184         if (head != 0) {
 185                 DRM_ERROR("%s initialization failed "
 186                                 "ctl %08x head %08x tail %08x start %08x\n",
 187                                 ring->name,
 188                                 I915_READ_CTL(ring),
 189                                 I915_READ_HEAD(ring),
 190                                 I915_READ_TAIL(ring),
 191                                 I915_READ_START(ring));
 192                 return -EIO;
 193         }
 194
 195         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 196                 i915_kernel_lost_context(dev);
 197         else {
 198                 ring->head = I915_READ_HEAD(ring) & HEAD_ADDR;
 199                 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
 200                 ring->space = ring->head - (ring->tail + 8);
 201                 if (ring->space < 0)
 202                         ring->space += ring->size;
 203         }
 204         return 0;
 205 }
 206
 207 static int init_render_ring(struct drm_device *dev,
 208                             struct intel_ring_buffer *ring)
 209 {
 210         drm_i915_private_t *dev_priv = dev->dev_private;
 211         int ret = init_ring_common(dev, ring);
 212         int mode;
 213
 214         if (INTEL_INFO(dev)->gen > 3) {
 215                 mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;
 216                 if (IS_GEN6(dev))
 217                         mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
 218                 I915_WRITE(MI_MODE, mode);
 219         }
 220         return ret;
 221 }
 222
 223 #define PIPE_CONTROL_FLUSH(addr)                                        \
 224 do {                                                                    \
 225         OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |          \
 226                  PIPE_CONTROL_DEPTH_STALL | 2);                         \
 227         OUT_RING(addr | PIPE_CONTROL_GLOBAL_GTT);                       \
 228         OUT_RING(0);                                                    \
 229         OUT_RING(0);                                                    \
 230 } while (0)
 231
 232 /**
 233  * Creates a new sequence number, emitting a write of it to the status page
 234  * plus an interrupt, which will trigger i915_user_interrupt_handler.
 235  *
 236  * Must be called with struct_lock held.
 237  *
 238  * Returned sequence numbers are nonzero on success.
 239  */
 240 static u32
 241 render_ring_add_request(struct drm_device *dev,
 242                         struct intel_ring_buffer *ring,
 243                         u32 flush_domains)
 244 {
 245         drm_i915_private_t *dev_priv = dev->dev_private;
 246         u32 seqno;
 247
 248         seqno = i915_gem_get_seqno(dev);
 249
 250         if (IS_GEN6(dev)) {
 251                 BEGIN_LP_RING(6);
 252                 OUT_RING(GFX_OP_PIPE_CONTROL | 3);
 253                 OUT_RING(PIPE_CONTROL_QW_WRITE |
 254                          PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_IS_FLUSH |
 255                          PIPE_CONTROL_NOTIFY);
 256                 OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT);
 257                 OUT_RING(seqno);
 258                 OUT_RING(0);
 259                 OUT_RING(0);
 260                 ADVANCE_LP_RING();
 261         } else if (HAS_PIPE_CONTROL(dev)) {
 262                 u32 scratch_addr = dev_priv->seqno_gfx_addr + 128;
 263
 264                 /*
 265                  * Workaround qword write incoherence by flushing the
 266                  * PIPE_NOTIFY buffers out to memory before requesting
 267                  * an interrupt.
 268                  */
 269                 BEGIN_LP_RING(32);
 270                 OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
 271                          PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH);
 272                 OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT);
 273                 OUT_RING(seqno);
 274                 OUT_RING(0);
 275                 PIPE_CONTROL_FLUSH(scratch_addr);
 276                 scratch_addr += 128; /* write to separate cachelines */
 277                 PIPE_CONTROL_FLUSH(scratch_addr);
 278                 scratch_addr += 128;
 279                 PIPE_CONTROL_FLUSH(scratch_addr);
 280                 scratch_addr += 128;
 281                 PIPE_CONTROL_FLUSH(scratch_addr);
 282                 scratch_addr += 128;
 283                 PIPE_CONTROL_FLUSH(scratch_addr);
 284                 scratch_addr += 128;
 285                 PIPE_CONTROL_FLUSH(scratch_addr);
 286                 OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
 287                          PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH |
 288                          PIPE_CONTROL_NOTIFY);
 289                 OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT);
 290                 OUT_RING(seqno);
 291                 OUT_RING(0);
 292                 ADVANCE_LP_RING();
 293         } else {
 294                 BEGIN_LP_RING(4);
 295                 OUT_RING(MI_STORE_DWORD_INDEX);
 296                 OUT_RING(I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 297                 OUT_RING(seqno);
 298
 299                 OUT_RING(MI_USER_INTERRUPT);
 300                 ADVANCE_LP_RING();
 301         }
 302         return seqno;
 303 }
 304
 305 static u32
 306 render_ring_get_seqno(struct drm_device *dev,
 307                       struct intel_ring_buffer *ring)
 308 {
 309         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 310         if (HAS_PIPE_CONTROL(dev))
 311                 return ((volatile u32 *)(dev_priv->seqno_page))[0];
 312         else
 313                 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
 314 }
 315
 316 static void
 317 render_ring_get_user_irq(struct drm_device *dev,
 318                          struct intel_ring_buffer *ring)
 319 {
 320         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 321         unsigned long irqflags;
 322
 323         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 324         if (dev->irq_enabled && (++ring->user_irq_refcount == 1)) {
 325                 if (HAS_PCH_SPLIT(dev))
 326                         ironlake_enable_graphics_irq(dev_priv, GT_PIPE_NOTIFY);
 327                 else
 328                         i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
 329         }
 330         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 331 }
 332
 333 static void
 334 render_ring_put_user_irq(struct drm_device *dev,
 335                          struct intel_ring_buffer *ring)
 336 {
 337         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 338         unsigned long irqflags;
 339
 340         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 341         BUG_ON(dev->irq_enabled && ring->user_irq_refcount <= 0);
 342         if (dev->irq_enabled && (--ring->user_irq_refcount == 0)) {
 343                 if (HAS_PCH_SPLIT(dev))
 344                         ironlake_disable_graphics_irq(dev_priv, GT_PIPE_NOTIFY);
 345                 else
 346                         i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
 347         }
 348         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 349 }
 350
 351 void intel_ring_setup_status_page(struct drm_device *dev,
 352                                   struct intel_ring_buffer *ring)
 353 {
 354         drm_i915_private_t *dev_priv = dev->dev_private;
 355         if (IS_GEN6(dev)) {
 356                 I915_WRITE(RING_HWS_PGA_GEN6(ring->mmio_base),
 357                            ring->status_page.gfx_addr);
 358                 I915_READ(RING_HWS_PGA_GEN6(ring->mmio_base)); /* posting read */
 359         } else {
 360                 I915_WRITE(RING_HWS_PGA(ring->mmio_base),
 361                            ring->status_page.gfx_addr);
 362                 I915_READ(RING_HWS_PGA(ring->mmio_base)); /* posting read */
 363         }
 364
 365 }
 366
 367 static void
 368 bsd_ring_flush(struct drm_device *dev,
 369                 struct intel_ring_buffer *ring,
 370                 u32     invalidate_domains,
 371                 u32     flush_domains)
 372 {
 373         intel_ring_begin(dev, ring, 2);
 374         intel_ring_emit(dev, ring, MI_FLUSH);
 375         intel_ring_emit(dev, ring, MI_NOOP);
 376         intel_ring_advance(dev, ring);
 377 }
 378
 379 static int init_bsd_ring(struct drm_device *dev,
 380                          struct intel_ring_buffer *ring)
 381 {
 382         return init_ring_common(dev, ring);
 383 }
 384
 385 static u32
 386 ring_add_request(struct drm_device *dev,
 387                  struct intel_ring_buffer *ring,
 388                  u32 flush_domains)
 389 {
 390         u32 seqno;
 391
 392         seqno = i915_gem_get_seqno(dev);
 393
 394         intel_ring_begin(dev, ring, 4);
 395         intel_ring_emit(dev, ring, MI_STORE_DWORD_INDEX);
 396         intel_ring_emit(dev, ring,
 397                         I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 398         intel_ring_emit(dev, ring, seqno);
 399         intel_ring_emit(dev, ring, MI_USER_INTERRUPT);
 400         intel_ring_advance(dev, ring);
 401
 402         DRM_DEBUG_DRIVER("%s %d\n", ring->name, seqno);
 403
 404         return seqno;
 405 }
 406
 407 static void
 408 bsd_ring_get_user_irq(struct drm_device *dev,
 409                       struct intel_ring_buffer *ring)
 410 {
 411         /* do nothing */
 412 }
 413 static void
 414 bsd_ring_put_user_irq(struct drm_device *dev,
 415                       struct intel_ring_buffer *ring)
 416 {
 417         /* do nothing */
 418 }
 419
 420 static u32
 421 ring_status_page_get_seqno(struct drm_device *dev,
 422                            struct intel_ring_buffer *ring)
 423 {
 424         return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
 425 }
 426
 427 static int
 428 ring_dispatch_gem_execbuffer(struct drm_device *dev,
 429                              struct intel_ring_buffer *ring,
 430                              struct drm_i915_gem_execbuffer2 *exec,
 431                              struct drm_clip_rect *cliprects,
 432                              uint64_t exec_offset)
 433 {
 434         uint32_t exec_start;
 435         exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
 436         intel_ring_begin(dev, ring, 2);
 437         intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START |
 438                         (2 << 6) | MI_BATCH_NON_SECURE_I965);
 439         intel_ring_emit(dev, ring, exec_start);
 440         intel_ring_advance(dev, ring);
 441         return 0;
 442 }
 443
 444 static int
 445 render_ring_dispatch_gem_execbuffer(struct drm_device *dev,
 446                                     struct intel_ring_buffer *ring,
 447                                     struct drm_i915_gem_execbuffer2 *exec,
 448                                     struct drm_clip_rect *cliprects,
 449                                     uint64_t exec_offset)
 450 {
 451         drm_i915_private_t *dev_priv = dev->dev_private;
 452         int nbox = exec->num_cliprects;
 453         int i = 0, count;
 454         uint32_t exec_start, exec_len;
 455         exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
 456         exec_len = (uint32_t) exec->batch_len;
 457
 458         trace_i915_gem_request_submit(dev, dev_priv->next_seqno + 1);
 459
 460         count = nbox ? nbox : 1;
 461
 462         for (i = 0; i < count; i++) {
 463                 if (i < nbox) {
 464                         int ret = i915_emit_box(dev, cliprects, i,
 465                                                 exec->DR1, exec->DR4);
 466                         if (ret)
 467                                 return ret;
 468                 }
 469
 470                 if (IS_I830(dev) || IS_845G(dev)) {
 471                         intel_ring_begin(dev, ring, 4);
 472                         intel_ring_emit(dev, ring, MI_BATCH_BUFFER);
 473                         intel_ring_emit(dev, ring,
 474                                         exec_start | MI_BATCH_NON_SECURE);
 475                         intel_ring_emit(dev, ring, exec_start + exec_len - 4);
 476                         intel_ring_emit(dev, ring, 0);
 477                 } else {
 478                         intel_ring_begin(dev, ring, 2);
 479                         if (INTEL_INFO(dev)->gen >= 4) {
 480                                 intel_ring_emit(dev, ring,
 481                                                 MI_BATCH_BUFFER_START | (2 << 6)
 482                                                 | MI_BATCH_NON_SECURE_I965);
 483                                 intel_ring_emit(dev, ring, exec_start);
 484                         } else {
 485                                 intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START
 486                                                 | (2 << 6));
 487                                 intel_ring_emit(dev, ring, exec_start |
 488                                                 MI_BATCH_NON_SECURE);
 489                         }
 490                 }
 491                 intel_ring_advance(dev, ring);
 492         }
 493
 494         if (IS_G4X(dev) || IS_GEN5(dev)) {
 495                 intel_ring_begin(dev, ring, 2);
 496                 intel_ring_emit(dev, ring, MI_FLUSH |
 497                                 MI_NO_WRITE_FLUSH |
 498                                 MI_INVALIDATE_ISP );
 499                 intel_ring_emit(dev, ring, MI_NOOP);
 500                 intel_ring_advance(dev, ring);
 501         }
 502         /* XXX breadcrumb */
 503
 504         return 0;
 505 }
 506
 507 static void cleanup_status_page(struct drm_device *dev,
 508                                 struct intel_ring_buffer *ring)
 509 {
 510         drm_i915_private_t *dev_priv = dev->dev_private;
 511         struct drm_gem_object *obj;
 512         struct drm_i915_gem_object *obj_priv;
 513
 514         obj = ring->status_page.obj;
 515         if (obj == NULL)
 516                 return;
 517         obj_priv = to_intel_bo(obj);
 518
 519         kunmap(obj_priv->pages[0]);
 520         i915_gem_object_unpin(obj);
 521         drm_gem_object_unreference(obj);
 522         ring->status_page.obj = NULL;
 523
 524         memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
 525 }
 526
 527 static int init_status_page(struct drm_device *dev,
 528                             struct intel_ring_buffer *ring)
 529 {
 530         drm_i915_private_t *dev_priv = dev->dev_private;
 531         struct drm_gem_object *obj;
 532         struct drm_i915_gem_object *obj_priv;
 533         int ret;
 534
 535         obj = i915_gem_alloc_object(dev, 4096);
 536         if (obj == NULL) {
 537                 DRM_ERROR("Failed to allocate status page\n");
 538                 ret = -ENOMEM;
 539                 goto err;
 540         }
 541         obj_priv = to_intel_bo(obj);
 542         obj_priv->agp_type = AGP_USER_CACHED_MEMORY;
 543
 544         ret = i915_gem_object_pin(obj, 4096);
 545         if (ret != 0) {
 546                 goto err_unref;
 547         }
 548
 549         ring->status_page.gfx_addr = obj_priv->gtt_offset;
 550         ring->status_page.page_addr = kmap(obj_priv->pages[0]);
 551         if (ring->status_page.page_addr == NULL) {
 552                 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
 553                 goto err_unpin;
 554         }
 555         ring->status_page.obj = obj;
 556         memset(ring->status_page.page_addr, 0, PAGE_SIZE);
 557
 558         intel_ring_setup_status_page(dev, ring);
 559         DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
 560                         ring->name, ring->status_page.gfx_addr);
 561
 562         return 0;
 563
 564 err_unpin:
 565         i915_gem_object_unpin(obj);
 566 err_unref:
 567         drm_gem_object_unreference(obj);
 568 err:
 569         return ret;
 570 }
 571
 572 int intel_init_ring_buffer(struct drm_device *dev,
 573                            struct intel_ring_buffer *ring)
 574 {
 575         struct drm_i915_private *dev_priv = dev->dev_private;
 576         struct drm_i915_gem_object *obj_priv;
 577         struct drm_gem_object *obj;
 578         int ret;
 579
 580         ring->dev = dev;
 581         INIT_LIST_HEAD(&ring->active_list);
 582         INIT_LIST_HEAD(&ring->request_list);
 583
 584         if (I915_NEED_GFX_HWS(dev)) {
 585                 ret = init_status_page(dev, ring);
 586                 if (ret)
 587                         return ret;
 588         }
 589
 590         obj = i915_gem_alloc_object(dev, ring->size);
 591         if (obj == NULL) {
 592                 DRM_ERROR("Failed to allocate ringbuffer\n");
 593                 ret = -ENOMEM;
 594                 goto err_hws;
 595         }
 596
 597         ring->gem_object = obj;
 598
 599         ret = i915_gem_object_pin(obj, PAGE_SIZE);
 600         if (ret)
 601                 goto err_unref;
 602
 603         obj_priv = to_intel_bo(obj);
 604         ring->map.size = ring->size;
 605         ring->map.offset = dev->agp->base + obj_priv->gtt_offset;
 606         ring->map.type = 0;
 607         ring->map.flags = 0;
 608         ring->map.mtrr = 0;
 609
 610         drm_core_ioremap_wc(&ring->map, dev);
 611         if (ring->map.handle == NULL) {
 612                 DRM_ERROR("Failed to map ringbuffer.\n");
 613                 ret = -EINVAL;
 614                 goto err_unpin;
 615         }
 616
 617         ring->virtual_start = ring->map.handle;
 618         ret = ring->init(dev, ring);
 619         if (ret)
 620                 goto err_unmap;
 621
 622         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 623                 i915_kernel_lost_context(dev);
 624         else {
 625                 ring->head = I915_READ_HEAD(ring) & HEAD_ADDR;
 626                 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
 627                 ring->space = ring->head - (ring->tail + 8);
 628                 if (ring->space < 0)
 629                         ring->space += ring->size;
 630         }
 631         return ret;
 632
 633 err_unmap:
 634         drm_core_ioremapfree(&ring->map, dev);
 635 err_unpin:
 636         i915_gem_object_unpin(obj);
 637 err_unref:
 638         drm_gem_object_unreference(obj);
 639         ring->gem_object = NULL;
 640 err_hws:
 641         cleanup_status_page(dev, ring);
 642         return ret;
 643 }
 644
 645 void intel_cleanup_ring_buffer(struct drm_device *dev,
 646                                struct intel_ring_buffer *ring)
 647 {
 648         if (ring->gem_object == NULL)
 649                 return;
 650
 651         drm_core_ioremapfree(&ring->map, dev);
 652
 653         i915_gem_object_unpin(ring->gem_object);
 654         drm_gem_object_unreference(ring->gem_object);
 655         ring->gem_object = NULL;
 656         cleanup_status_page(dev, ring);
 657 }
 658
 659 static int intel_wrap_ring_buffer(struct drm_device *dev,
 660                                   struct intel_ring_buffer *ring)
 661 {
 662         unsigned int *virt;
 663         int rem;
 664         rem = ring->size - ring->tail;
 665
 666         if (ring->space < rem) {
 667                 int ret = intel_wait_ring_buffer(dev, ring, rem);
 668                 if (ret)
 669                         return ret;
 670         }
 671
 672         virt = (unsigned int *)(ring->virtual_start + ring->tail);
 673         rem /= 8;
 674         while (rem--) {
 675                 *virt++ = MI_NOOP;
 676                 *virt++ = MI_NOOP;
 677         }
 678
 679         ring->tail = 0;
 680         ring->space = ring->head - 8;
 681
 682         return 0;
 683 }
 684
 685 int intel_wait_ring_buffer(struct drm_device *dev,
 686                            struct intel_ring_buffer *ring, int n)
 687 {
 688         unsigned long end;
 689         drm_i915_private_t *dev_priv = dev->dev_private;
 690
 691         trace_i915_ring_wait_begin (dev);
 692         end = jiffies + 3 * HZ;
 693         do {
 694                 ring->head = I915_READ_HEAD(ring) & HEAD_ADDR;
 695                 ring->space = ring->head - (ring->tail + 8);
 696                 if (ring->space < 0)
 697                         ring->space += ring->size;
 698                 if (ring->space >= n) {
 699                         trace_i915_ring_wait_end (dev);
 700                         return 0;
 701                 }
 702
 703                 if (dev->primary->master) {
 704                         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 705                         if (master_priv->sarea_priv)
 706                                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 707                 }
 708
 709                 msleep(1);
 710         } while (!time_after(jiffies, end));
 711         trace_i915_ring_wait_end (dev);
 712         return -EBUSY;
 713 }
 714
 715 void intel_ring_begin(struct drm_device *dev,
 716                       struct intel_ring_buffer *ring,
 717                       int num_dwords)
 718 {
 719         int n = 4*num_dwords;
 720         if (unlikely(ring->tail + n > ring->size))
 721                 intel_wrap_ring_buffer(dev, ring);
 722         if (unlikely(ring->space < n))
 723                 intel_wait_ring_buffer(dev, ring, n);
 724
 725         ring->space -= n;
 726 }
 727
 728 void intel_ring_advance(struct drm_device *dev,
 729                         struct intel_ring_buffer *ring)
 730 {
 731         ring->tail &= ring->size - 1;
 732         ring->set_tail(dev, ring, ring->tail);
 733 }
 734
 735 static const struct intel_ring_buffer render_ring = {
 736         .name                   = "render ring",
 737         .id                     = RING_RENDER,
 738         .mmio_base              = RENDER_RING_BASE,
 739         .size                   = 32 * PAGE_SIZE,
 740         .init                   = init_render_ring,
 741         .set_tail               = ring_set_tail,
 742         .flush                  = render_ring_flush,
 743         .add_request            = render_ring_add_request,
 744         .get_seqno              = render_ring_get_seqno,
 745         .user_irq_get           = render_ring_get_user_irq,
 746         .user_irq_put           = render_ring_put_user_irq,
 747         .dispatch_gem_execbuffer = render_ring_dispatch_gem_execbuffer,
 748 };
 749
 750 /* ring buffer for bit-stream decoder */
 751
 752 static const struct intel_ring_buffer bsd_ring = {
 753         .name                   = "bsd ring",
 754         .id                     = RING_BSD,
 755         .mmio_base              = BSD_RING_BASE,
 756         .size                   = 32 * PAGE_SIZE,
 757         .init                   = init_bsd_ring,
 758         .set_tail               = ring_set_tail,
 759         .flush                  = bsd_ring_flush,
 760         .add_request            = ring_add_request,
 761         .get_seqno              = ring_status_page_get_seqno,
 762         .user_irq_get           = bsd_ring_get_user_irq,
 763         .user_irq_put           = bsd_ring_put_user_irq,
 764         .dispatch_gem_execbuffer = ring_dispatch_gem_execbuffer,
 765 };
 766
 767
 768 static void gen6_bsd_ring_set_tail(struct drm_device *dev,
 769                                    struct intel_ring_buffer *ring,
 770                                    u32 value)
 771 {
 772        drm_i915_private_t *dev_priv = dev->dev_private;
 773
 774        /* Every tail move must follow the sequence below */
 775        I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
 776                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
 777                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE);
 778        I915_WRITE(GEN6_BSD_RNCID, 0x0);
 779
 780        if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
 781                                GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR) == 0,
 782                        50))
 783                DRM_ERROR("timed out waiting for IDLE Indicator\n");
 784
 785        I915_WRITE_TAIL(ring, value);
 786        I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
 787                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
 788                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE);
 789 }
 790
 791 static void gen6_ring_flush(struct drm_device *dev,
 792                             struct intel_ring_buffer *ring,
 793                             u32 invalidate_domains,
 794                             u32 flush_domains)
 795 {
 796        intel_ring_begin(dev, ring, 4);
 797        intel_ring_emit(dev, ring, MI_FLUSH_DW);
 798        intel_ring_emit(dev, ring, 0);
 799        intel_ring_emit(dev, ring, 0);
 800        intel_ring_emit(dev, ring, 0);
 801        intel_ring_advance(dev, ring);
 802 }
 803
 804 static int
 805 gen6_ring_dispatch_gem_execbuffer(struct drm_device *dev,
 806                                   struct intel_ring_buffer *ring,
 807                                   struct drm_i915_gem_execbuffer2 *exec,
 808                                   struct drm_clip_rect *cliprects,
 809                                   uint64_t exec_offset)
 810 {
 811        uint32_t exec_start;
 812
 813        exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
 814
 815        intel_ring_begin(dev, ring, 2);
 816        intel_ring_emit(dev, ring,
 817                        MI_BATCH_BUFFER_START | MI_BATCH_NON_SECURE_I965);
 818        /* bit0-7 is the length on GEN6+ */
 819        intel_ring_emit(dev, ring, exec_start);
 820        intel_ring_advance(dev, ring);
 821
 822        return 0;
 823 }
 824
 825 /* ring buffer for Video Codec for Gen6+ */
 826 static const struct intel_ring_buffer gen6_bsd_ring = {
 827        .name                    = "gen6 bsd ring",
 828        .id                      = RING_BSD,
 829        .mmio_base               = GEN6_BSD_RING_BASE,
 830        .size                    = 32 * PAGE_SIZE,
 831        .init                    = init_bsd_ring,
 832        .set_tail                = gen6_bsd_ring_set_tail,
 833        .flush                   = gen6_ring_flush,
 834        .add_request             = ring_add_request,
 835        .get_seqno               = ring_status_page_get_seqno,
 836        .user_irq_get            = bsd_ring_get_user_irq,
 837        .user_irq_put            = bsd_ring_put_user_irq,
 838        .dispatch_gem_execbuffer = gen6_ring_dispatch_gem_execbuffer,
 839 };
 840
 841 /* Blitter support (SandyBridge+) */
 842
 843 static void
 844 blt_ring_get_user_irq(struct drm_device *dev,
 845                       struct intel_ring_buffer *ring)
 846 {
 847         /* do nothing */
 848 }
 849 static void
 850 blt_ring_put_user_irq(struct drm_device *dev,
 851                       struct intel_ring_buffer *ring)
 852 {
 853         /* do nothing */
 854 }
 855
 856 static const struct intel_ring_buffer gen6_blt_ring = {
 857        .name                    = "blt ring",
 858        .id                      = RING_BLT,
 859        .mmio_base               = BLT_RING_BASE,
 860        .size                    = 32 * PAGE_SIZE,
 861        .init                    = init_ring_common,
 862        .set_tail                = ring_set_tail,
 863        .flush                   = gen6_ring_flush,
 864        .add_request             = ring_add_request,
 865        .get_seqno               = ring_status_page_get_seqno,
 866        .user_irq_get            = blt_ring_get_user_irq,
 867        .user_irq_put            = blt_ring_put_user_irq,
 868        .dispatch_gem_execbuffer = gen6_ring_dispatch_gem_execbuffer,
 869 };
 870
 871 int intel_init_render_ring_buffer(struct drm_device *dev)
 872 {
 873         drm_i915_private_t *dev_priv = dev->dev_private;
 874
 875         dev_priv->render_ring = render_ring;
 876
 877         if (!I915_NEED_GFX_HWS(dev)) {
 878                 dev_priv->render_ring.status_page.page_addr
 879                         = dev_priv->status_page_dmah->vaddr;
 880                 memset(dev_priv->render_ring.status_page.page_addr,
 881                                 0, PAGE_SIZE);
 882         }
 883
 884         return intel_init_ring_buffer(dev, &dev_priv->render_ring);
 885 }
 886
 887 int intel_init_bsd_ring_buffer(struct drm_device *dev)
 888 {
 889         drm_i915_private_t *dev_priv = dev->dev_private;
 890
 891         if (IS_GEN6(dev))
 892                 dev_priv->bsd_ring = gen6_bsd_ring;
 893         else
 894                 dev_priv->bsd_ring = bsd_ring;
 895
 896         return intel_init_ring_buffer(dev, &dev_priv->bsd_ring);
 897 }
 898
 899 int intel_init_blt_ring_buffer(struct drm_device *dev)
 900 {
 901         drm_i915_private_t *dev_priv = dev->dev_private;
 902
 903         dev_priv->blt_ring = gen6_blt_ring;
 904
 905         return intel_init_ring_buffer(dev, &dev_priv->blt_ring);
 906 }