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_write_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, value);
 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->write_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         INIT_LIST_HEAD(&ring->gpu_write_list);
 584
 585         if (I915_NEED_GFX_HWS(dev)) {
 586                 ret = init_status_page(dev, ring);
 587                 if (ret)
 588                         return ret;
 589         }
 590
 591         obj = i915_gem_alloc_object(dev, ring->size);
 592         if (obj == NULL) {
 593                 DRM_ERROR("Failed to allocate ringbuffer\n");
 594                 ret = -ENOMEM;
 595                 goto err_hws;
 596         }
 597
 598         ring->gem_object = obj;
 599
 600         ret = i915_gem_object_pin(obj, PAGE_SIZE);
 601         if (ret)
 602                 goto err_unref;
 603
 604         obj_priv = to_intel_bo(obj);
 605         ring->map.size = ring->size;
 606         ring->map.offset = dev->agp->base + obj_priv->gtt_offset;
 607         ring->map.type = 0;
 608         ring->map.flags = 0;
 609         ring->map.mtrr = 0;
 610
 611         drm_core_ioremap_wc(&ring->map, dev);
 612         if (ring->map.handle == NULL) {
 613                 DRM_ERROR("Failed to map ringbuffer.\n");
 614                 ret = -EINVAL;
 615                 goto err_unpin;
 616         }
 617
 618         ring->virtual_start = ring->map.handle;
 619         ret = ring->init(dev, ring);
 620         if (ret)
 621                 goto err_unmap;
 622
 623         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 624                 i915_kernel_lost_context(dev);
 625         else {
 626                 ring->head = I915_READ_HEAD(ring) & HEAD_ADDR;
 627                 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
 628                 ring->space = ring->head - (ring->tail + 8);
 629                 if (ring->space < 0)
 630                         ring->space += ring->size;
 631         }
 632         return ret;
 633
 634 err_unmap:
 635         drm_core_ioremapfree(&ring->map, dev);
 636 err_unpin:
 637         i915_gem_object_unpin(obj);
 638 err_unref:
 639         drm_gem_object_unreference(obj);
 640         ring->gem_object = NULL;
 641 err_hws:
 642         cleanup_status_page(dev, ring);
 643         return ret;
 644 }
 645
 646 void intel_cleanup_ring_buffer(struct drm_device *dev,
 647                                struct intel_ring_buffer *ring)
 648 {
 649         if (ring->gem_object == NULL)
 650                 return;
 651
 652         drm_core_ioremapfree(&ring->map, dev);
 653
 654         i915_gem_object_unpin(ring->gem_object);
 655         drm_gem_object_unreference(ring->gem_object);
 656         ring->gem_object = NULL;
 657
 658         if (ring->cleanup)
 659                 ring->cleanup(ring);
 660
 661         cleanup_status_page(dev, ring);
 662 }
 663
 664 static int intel_wrap_ring_buffer(struct drm_device *dev,
 665                                   struct intel_ring_buffer *ring)
 666 {
 667         unsigned int *virt;
 668         int rem;
 669         rem = ring->size - ring->tail;
 670
 671         if (ring->space < rem) {
 672                 int ret = intel_wait_ring_buffer(dev, ring, rem);
 673                 if (ret)
 674                         return ret;
 675         }
 676
 677         virt = (unsigned int *)(ring->virtual_start + ring->tail);
 678         rem /= 8;
 679         while (rem--) {
 680                 *virt++ = MI_NOOP;
 681                 *virt++ = MI_NOOP;
 682         }
 683
 684         ring->tail = 0;
 685         ring->space = ring->head - 8;
 686
 687         return 0;
 688 }
 689
 690 int intel_wait_ring_buffer(struct drm_device *dev,
 691                            struct intel_ring_buffer *ring, int n)
 692 {
 693         unsigned long end;
 694         drm_i915_private_t *dev_priv = dev->dev_private;
 695
 696         trace_i915_ring_wait_begin (dev);
 697         end = jiffies + 3 * HZ;
 698         do {
 699                 ring->head = I915_READ_HEAD(ring) & HEAD_ADDR;
 700                 ring->space = ring->head - (ring->tail + 8);
 701                 if (ring->space < 0)
 702                         ring->space += ring->size;
 703                 if (ring->space >= n) {
 704                         trace_i915_ring_wait_end (dev);
 705                         return 0;
 706                 }
 707
 708                 if (dev->primary->master) {
 709                         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 710                         if (master_priv->sarea_priv)
 711                                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 712                 }
 713
 714                 msleep(1);
 715         } while (!time_after(jiffies, end));
 716         trace_i915_ring_wait_end (dev);
 717         return -EBUSY;
 718 }
 719
 720 void intel_ring_begin(struct drm_device *dev,
 721                       struct intel_ring_buffer *ring,
 722                       int num_dwords)
 723 {
 724         int n = 4*num_dwords;
 725         if (unlikely(ring->tail + n > ring->size))
 726                 intel_wrap_ring_buffer(dev, ring);
 727         if (unlikely(ring->space < n))
 728                 intel_wait_ring_buffer(dev, ring, n);
 729
 730         ring->space -= n;
 731 }
 732
 733 void intel_ring_advance(struct drm_device *dev,
 734                         struct intel_ring_buffer *ring)
 735 {
 736         ring->tail &= ring->size - 1;
 737         ring->write_tail(dev, ring, ring->tail);
 738 }
 739
 740 static const struct intel_ring_buffer render_ring = {
 741         .name                   = "render ring",
 742         .id                     = RING_RENDER,
 743         .mmio_base              = RENDER_RING_BASE,
 744         .size                   = 32 * PAGE_SIZE,
 745         .init                   = init_render_ring,
 746         .write_tail             = ring_write_tail,
 747         .flush                  = render_ring_flush,
 748         .add_request            = render_ring_add_request,
 749         .get_seqno              = render_ring_get_seqno,
 750         .user_irq_get           = render_ring_get_user_irq,
 751         .user_irq_put           = render_ring_put_user_irq,
 752         .dispatch_gem_execbuffer = render_ring_dispatch_gem_execbuffer,
 753 };
 754
 755 /* ring buffer for bit-stream decoder */
 756
 757 static const struct intel_ring_buffer bsd_ring = {
 758         .name                   = "bsd ring",
 759         .id                     = RING_BSD,
 760         .mmio_base              = BSD_RING_BASE,
 761         .size                   = 32 * PAGE_SIZE,
 762         .init                   = init_bsd_ring,
 763         .write_tail             = ring_write_tail,
 764         .flush                  = bsd_ring_flush,
 765         .add_request            = ring_add_request,
 766         .get_seqno              = ring_status_page_get_seqno,
 767         .user_irq_get           = bsd_ring_get_user_irq,
 768         .user_irq_put           = bsd_ring_put_user_irq,
 769         .dispatch_gem_execbuffer = ring_dispatch_gem_execbuffer,
 770 };
 771
 772
 773 static void gen6_bsd_ring_write_tail(struct drm_device *dev,
 774                                      struct intel_ring_buffer *ring,
 775                                      u32 value)
 776 {
 777        drm_i915_private_t *dev_priv = dev->dev_private;
 778
 779        /* Every tail move must follow the sequence below */
 780        I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
 781                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
 782                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE);
 783        I915_WRITE(GEN6_BSD_RNCID, 0x0);
 784
 785        if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
 786                                GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR) == 0,
 787                        50))
 788                DRM_ERROR("timed out waiting for IDLE Indicator\n");
 789
 790        I915_WRITE_TAIL(ring, value);
 791        I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
 792                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
 793                GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE);
 794 }
 795
 796 static void gen6_ring_flush(struct drm_device *dev,
 797                             struct intel_ring_buffer *ring,
 798                             u32 invalidate_domains,
 799                             u32 flush_domains)
 800 {
 801        intel_ring_begin(dev, ring, 4);
 802        intel_ring_emit(dev, ring, MI_FLUSH_DW);
 803        intel_ring_emit(dev, ring, 0);
 804        intel_ring_emit(dev, ring, 0);
 805        intel_ring_emit(dev, ring, 0);
 806        intel_ring_advance(dev, ring);
 807 }
 808
 809 static int
 810 gen6_ring_dispatch_gem_execbuffer(struct drm_device *dev,
 811                                   struct intel_ring_buffer *ring,
 812                                   struct drm_i915_gem_execbuffer2 *exec,
 813                                   struct drm_clip_rect *cliprects,
 814                                   uint64_t exec_offset)
 815 {
 816        uint32_t exec_start;
 817
 818        exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
 819
 820        intel_ring_begin(dev, ring, 2);
 821        intel_ring_emit(dev, ring,
 822                        MI_BATCH_BUFFER_START | MI_BATCH_NON_SECURE_I965);
 823        /* bit0-7 is the length on GEN6+ */
 824        intel_ring_emit(dev, ring, exec_start);
 825        intel_ring_advance(dev, ring);
 826
 827        return 0;
 828 }
 829
 830 /* ring buffer for Video Codec for Gen6+ */
 831 static const struct intel_ring_buffer gen6_bsd_ring = {
 832        .name                    = "gen6 bsd ring",
 833        .id                      = RING_BSD,
 834        .mmio_base               = GEN6_BSD_RING_BASE,
 835        .size                    = 32 * PAGE_SIZE,
 836        .init                    = init_bsd_ring,
 837        .write_tail              = gen6_bsd_ring_write_tail,
 838        .flush                   = gen6_ring_flush,
 839        .add_request             = ring_add_request,
 840        .get_seqno               = ring_status_page_get_seqno,
 841        .user_irq_get            = bsd_ring_get_user_irq,
 842        .user_irq_put            = bsd_ring_put_user_irq,
 843        .dispatch_gem_execbuffer = gen6_ring_dispatch_gem_execbuffer,
 844 };
 845
 846 /* Blitter support (SandyBridge+) */
 847
 848 static void
 849 blt_ring_get_user_irq(struct drm_device *dev,
 850                       struct intel_ring_buffer *ring)
 851 {
 852         /* do nothing */
 853 }
 854 static void
 855 blt_ring_put_user_irq(struct drm_device *dev,
 856                       struct intel_ring_buffer *ring)
 857 {
 858         /* do nothing */
 859 }
 860
 861
 862 /* Workaround for some stepping of SNB,
 863  * each time when BLT engine ring tail moved,
 864  * the first command in the ring to be parsed
 865  * should be MI_BATCH_BUFFER_START
 866  */
 867 #define NEED_BLT_WORKAROUND(dev) \
 868         (IS_GEN6(dev) && (dev->pdev->revision < 8))
 869
 870 static inline struct drm_i915_gem_object *
 871 to_blt_workaround(struct intel_ring_buffer *ring)
 872 {
 873         return ring->private;
 874 }
 875
 876 static int blt_ring_init(struct drm_device *dev,
 877                          struct intel_ring_buffer *ring)
 878 {
 879         if (NEED_BLT_WORKAROUND(dev)) {
 880                 struct drm_i915_gem_object *obj;
 881                 u32 __iomem *ptr;
 882                 int ret;
 883
 884                 obj = to_intel_bo(i915_gem_alloc_object(dev, 4096));
 885                 if (obj == NULL)
 886                         return -ENOMEM;
 887
 888                 ret = i915_gem_object_pin(&obj->base, 4096);
 889                 if (ret) {
 890                         drm_gem_object_unreference(&obj->base);
 891                         return ret;
 892                 }
 893
 894                 ptr = kmap(obj->pages[0]);
 895                 iowrite32(MI_BATCH_BUFFER_END, ptr);
 896                 iowrite32(MI_NOOP, ptr+1);
 897                 kunmap(obj->pages[0]);
 898
 899                 ret = i915_gem_object_set_to_gtt_domain(&obj->base, false);
 900                 if (ret) {
 901                         i915_gem_object_unpin(&obj->base);
 902                         drm_gem_object_unreference(&obj->base);
 903                         return ret;
 904                 }
 905
 906                 ring->private = obj;
 907         }
 908
 909         return init_ring_common(dev, ring);
 910 }
 911
 912 static void blt_ring_begin(struct drm_device *dev,
 913                            struct intel_ring_buffer *ring,
 914                           int num_dwords)
 915 {
 916         if (ring->private) {
 917                 intel_ring_begin(dev, ring, num_dwords+2);
 918                 intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START);
 919                 intel_ring_emit(dev, ring, to_blt_workaround(ring)->gtt_offset);
 920         } else
 921                 intel_ring_begin(dev, ring, 4);
 922 }
 923
 924 static void blt_ring_flush(struct drm_device *dev,
 925                            struct intel_ring_buffer *ring,
 926                            u32 invalidate_domains,
 927                            u32 flush_domains)
 928 {
 929         blt_ring_begin(dev, ring, 4);
 930         intel_ring_emit(dev, ring, MI_FLUSH_DW);
 931         intel_ring_emit(dev, ring, 0);
 932         intel_ring_emit(dev, ring, 0);
 933         intel_ring_emit(dev, ring, 0);
 934         intel_ring_advance(dev, ring);
 935 }
 936
 937 static u32
 938 blt_ring_add_request(struct drm_device *dev,
 939                      struct intel_ring_buffer *ring,
 940                      u32 flush_domains)
 941 {
 942         u32 seqno = i915_gem_get_seqno(dev);
 943
 944         blt_ring_begin(dev, ring, 4);
 945         intel_ring_emit(dev, ring, MI_STORE_DWORD_INDEX);
 946         intel_ring_emit(dev, ring,
 947                         I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 948         intel_ring_emit(dev, ring, seqno);
 949         intel_ring_emit(dev, ring, MI_USER_INTERRUPT);
 950         intel_ring_advance(dev, ring);
 951
 952         DRM_DEBUG_DRIVER("%s %d\n", ring->name, seqno);
 953         return seqno;
 954 }
 955
 956 static void blt_ring_cleanup(struct intel_ring_buffer *ring)
 957 {
 958         if (!ring->private)
 959                 return;
 960
 961         i915_gem_object_unpin(ring->private);
 962         drm_gem_object_unreference(ring->private);
 963         ring->private = NULL;
 964 }
 965
 966 static const struct intel_ring_buffer gen6_blt_ring = {
 967        .name                    = "blt ring",
 968        .id                      = RING_BLT,
 969        .mmio_base               = BLT_RING_BASE,
 970        .size                    = 32 * PAGE_SIZE,
 971        .init                    = blt_ring_init,
 972        .write_tail              = ring_write_tail,
 973        .flush                   = blt_ring_flush,
 974        .add_request             = blt_ring_add_request,
 975        .get_seqno               = ring_status_page_get_seqno,
 976        .user_irq_get            = blt_ring_get_user_irq,
 977        .user_irq_put            = blt_ring_put_user_irq,
 978        .dispatch_gem_execbuffer = gen6_ring_dispatch_gem_execbuffer,
 979        .cleanup                 = blt_ring_cleanup,
 980 };
 981
 982 int intel_init_render_ring_buffer(struct drm_device *dev)
 983 {
 984         drm_i915_private_t *dev_priv = dev->dev_private;
 985
 986         dev_priv->render_ring = render_ring;
 987
 988         if (!I915_NEED_GFX_HWS(dev)) {
 989                 dev_priv->render_ring.status_page.page_addr
 990                         = dev_priv->status_page_dmah->vaddr;
 991                 memset(dev_priv->render_ring.status_page.page_addr,
 992                                 0, PAGE_SIZE);
 993         }
 994
 995         return intel_init_ring_buffer(dev, &dev_priv->render_ring);
 996 }
 997
 998 int intel_init_bsd_ring_buffer(struct drm_device *dev)
 999 {
1000         drm_i915_private_t *dev_priv = dev->dev_private;
1001
1002         if (IS_GEN6(dev))
1003                 dev_priv->bsd_ring = gen6_bsd_ring;
1004         else
1005                 dev_priv->bsd_ring = bsd_ring;
1006
1007         return intel_init_ring_buffer(dev, &dev_priv->bsd_ring);
1008 }
1009
1010 int intel_init_blt_ring_buffer(struct drm_device *dev)
1011 {
1012         drm_i915_private_t *dev_priv = dev->dev_private;
1013
1014         dev_priv->blt_ring = gen6_blt_ring;
1015
1016         return intel_init_ring_buffer(dev, &dev_priv->blt_ring);
1017 }