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 <drm/drmP.h>
  31 #include "i915_drv.h"
  32 #include <drm/i915_drm.h>
  33 #include "i915_trace.h"
  34 #include "intel_drv.h"
  35
  36 bool
  37 intel_ring_initialized(struct intel_engine_cs *ring)
  38 {
  39         struct drm_device *dev = ring->dev;
  40
  41         if (!dev)
  42                 return false;
  43
  44         if (i915.enable_execlists) {
  45                 struct intel_context *dctx = ring->default_context;
  46                 struct intel_ringbuffer *ringbuf = dctx->engine[ring->id].ringbuf;
  47
  48                 return ringbuf->obj;
  49         } else
  50                 return ring->buffer && ring->buffer->obj;
  51 }
  52
  53 int __intel_ring_space(int head, int tail, int size)
  54 {
  55         int space = head - (tail + I915_RING_FREE_SPACE);
  56         if (space < 0)
  57                 space += size;
  58         return space;
  59 }
  60
  61 int intel_ring_space(struct intel_ringbuffer *ringbuf)
  62 {
  63         return __intel_ring_space(ringbuf->head & HEAD_ADDR,
  64                                   ringbuf->tail, ringbuf->size);
  65 }
  66
  67 bool intel_ring_stopped(struct intel_engine_cs *ring)
  68 {
  69         struct drm_i915_private *dev_priv = ring->dev->dev_private;
  70         return dev_priv->gpu_error.stop_rings & intel_ring_flag(ring);
  71 }
  72
  73 void __intel_ring_advance(struct intel_engine_cs *ring)
  74 {
  75         struct intel_ringbuffer *ringbuf = ring->buffer;
  76         ringbuf->tail &= ringbuf->size - 1;
  77         if (intel_ring_stopped(ring))
  78                 return;
  79         ring->write_tail(ring, ringbuf->tail);
  80 }
  81
  82 static int
  83 gen2_render_ring_flush(struct intel_engine_cs *ring,
  84                        u32      invalidate_domains,
  85                        u32      flush_domains)
  86 {
  87         u32 cmd;
  88         int ret;
  89
  90         cmd = MI_FLUSH;
  91         if (((invalidate_domains|flush_domains) & I915_GEM_DOMAIN_RENDER) == 0)
  92                 cmd |= MI_NO_WRITE_FLUSH;
  93
  94         if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)
  95                 cmd |= MI_READ_FLUSH;
  96
  97         ret = intel_ring_begin(ring, 2);
  98         if (ret)
  99                 return ret;
 100
 101         intel_ring_emit(ring, cmd);
 102         intel_ring_emit(ring, MI_NOOP);
 103         intel_ring_advance(ring);
 104
 105         return 0;
 106 }
 107
 108 static int
 109 gen4_render_ring_flush(struct intel_engine_cs *ring,
 110                        u32      invalidate_domains,
 111                        u32      flush_domains)
 112 {
 113         struct drm_device *dev = ring->dev;
 114         u32 cmd;
 115         int ret;
 116
 117         /*
 118          * read/write caches:
 119          *
 120          * I915_GEM_DOMAIN_RENDER is always invalidated, but is
 121          * only flushed if MI_NO_WRITE_FLUSH is unset.  On 965, it is
 122          * also flushed at 2d versus 3d pipeline switches.
 123          *
 124          * read-only caches:
 125          *
 126          * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
 127          * MI_READ_FLUSH is set, and is always flushed on 965.
 128          *
 129          * I915_GEM_DOMAIN_COMMAND may not exist?
 130          *
 131          * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
 132          * invalidated when MI_EXE_FLUSH is set.
 133          *
 134          * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
 135          * invalidated with every MI_FLUSH.
 136          *
 137          * TLBs:
 138          *
 139          * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
 140          * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
 141          * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
 142          * are flushed at any MI_FLUSH.
 143          */
 144
 145         cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
 146         if ((invalidate_domains|flush_domains) & I915_GEM_DOMAIN_RENDER)
 147                 cmd &= ~MI_NO_WRITE_FLUSH;
 148         if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)
 149                 cmd |= MI_EXE_FLUSH;
 150
 151         if (invalidate_domains & I915_GEM_DOMAIN_COMMAND &&
 152             (IS_G4X(dev) || IS_GEN5(dev)))
 153                 cmd |= MI_INVALIDATE_ISP;
 154
 155         ret = intel_ring_begin(ring, 2);
 156         if (ret)
 157                 return ret;
 158
 159         intel_ring_emit(ring, cmd);
 160         intel_ring_emit(ring, MI_NOOP);
 161         intel_ring_advance(ring);
 162
 163         return 0;
 164 }
 165
 166 /**
 167  * Emits a PIPE_CONTROL with a non-zero post-sync operation, for
 168  * implementing two workarounds on gen6.  From section 1.4.7.1
 169  * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1:
 170  *
 171  * [DevSNB-C+{W/A}] Before any depth stall flush (including those
 172  * produced by non-pipelined state commands), software needs to first
 173  * send a PIPE_CONTROL with no bits set except Post-Sync Operation !=
 174  * 0.
 175  *
 176  * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable
 177  * =1, a PIPE_CONTROL with any non-zero post-sync-op is required.
 178  *
 179  * And the workaround for these two requires this workaround first:
 180  *
 181  * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent
 182  * BEFORE the pipe-control with a post-sync op and no write-cache
 183  * flushes.
 184  *
 185  * And this last workaround is tricky because of the requirements on
 186  * that bit.  From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM
 187  * volume 2 part 1:
 188  *
 189  *     "1 of the following must also be set:
 190  *      - Render Target Cache Flush Enable ([12] of DW1)
 191  *      - Depth Cache Flush Enable ([0] of DW1)
 192  *      - Stall at Pixel Scoreboard ([1] of DW1)
 193  *      - Depth Stall ([13] of DW1)
 194  *      - Post-Sync Operation ([13] of DW1)
 195  *      - Notify Enable ([8] of DW1)"
 196  *
 197  * The cache flushes require the workaround flush that triggered this
 198  * one, so we can't use it.  Depth stall would trigger the same.
 199  * Post-sync nonzero is what triggered this second workaround, so we
 200  * can't use that one either.  Notify enable is IRQs, which aren't
 201  * really our business.  That leaves only stall at scoreboard.
 202  */
 203 static int
 204 intel_emit_post_sync_nonzero_flush(struct intel_engine_cs *ring)
 205 {
 206         u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
 207         int ret;
 208
 209
 210         ret = intel_ring_begin(ring, 6);
 211         if (ret)
 212                 return ret;
 213
 214         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));
 215         intel_ring_emit(ring, PIPE_CONTROL_CS_STALL |
 216                         PIPE_CONTROL_STALL_AT_SCOREBOARD);
 217         intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */
 218         intel_ring_emit(ring, 0); /* low dword */
 219         intel_ring_emit(ring, 0); /* high dword */
 220         intel_ring_emit(ring, MI_NOOP);
 221         intel_ring_advance(ring);
 222
 223         ret = intel_ring_begin(ring, 6);
 224         if (ret)
 225                 return ret;
 226
 227         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));
 228         intel_ring_emit(ring, PIPE_CONTROL_QW_WRITE);
 229         intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */
 230         intel_ring_emit(ring, 0);
 231         intel_ring_emit(ring, 0);
 232         intel_ring_emit(ring, MI_NOOP);
 233         intel_ring_advance(ring);
 234
 235         return 0;
 236 }
 237
 238 static int
 239 gen6_render_ring_flush(struct intel_engine_cs *ring,
 240                          u32 invalidate_domains, u32 flush_domains)
 241 {
 242         u32 flags = 0;
 243         u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
 244         int ret;
 245
 246         /* Force SNB workarounds for PIPE_CONTROL flushes */
 247         ret = intel_emit_post_sync_nonzero_flush(ring);
 248         if (ret)
 249                 return ret;
 250
 251         /* Just flush everything.  Experiments have shown that reducing the
 252          * number of bits based on the write domains has little performance
 253          * impact.
 254          */
 255         if (flush_domains) {
 256                 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
 257                 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
 258                 /*
 259                  * Ensure that any following seqno writes only happen
 260                  * when the render cache is indeed flushed.
 261                  */
 262                 flags |= PIPE_CONTROL_CS_STALL;
 263         }
 264         if (invalidate_domains) {
 265                 flags |= PIPE_CONTROL_TLB_INVALIDATE;
 266                 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
 267                 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
 268                 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
 269                 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
 270                 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
 271                 /*
 272                  * TLB invalidate requires a post-sync write.
 273                  */
 274                 flags |= PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_CS_STALL;
 275         }
 276
 277         ret = intel_ring_begin(ring, 4);
 278         if (ret)
 279                 return ret;
 280
 281         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4));
 282         intel_ring_emit(ring, flags);
 283         intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT);
 284         intel_ring_emit(ring, 0);
 285         intel_ring_advance(ring);
 286
 287         return 0;
 288 }
 289
 290 static int
 291 gen7_render_ring_cs_stall_wa(struct intel_engine_cs *ring)
 292 {
 293         int ret;
 294
 295         ret = intel_ring_begin(ring, 4);
 296         if (ret)
 297                 return ret;
 298
 299         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4));
 300         intel_ring_emit(ring, PIPE_CONTROL_CS_STALL |
 301                               PIPE_CONTROL_STALL_AT_SCOREBOARD);
 302         intel_ring_emit(ring, 0);
 303         intel_ring_emit(ring, 0);
 304         intel_ring_advance(ring);
 305
 306         return 0;
 307 }
 308
 309 static int gen7_ring_fbc_flush(struct intel_engine_cs *ring, u32 value)
 310 {
 311         int ret;
 312
 313         if (!ring->fbc_dirty)
 314                 return 0;
 315
 316         ret = intel_ring_begin(ring, 6);
 317         if (ret)
 318                 return ret;
 319         /* WaFbcNukeOn3DBlt:ivb/hsw */
 320         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
 321         intel_ring_emit(ring, MSG_FBC_REND_STATE);
 322         intel_ring_emit(ring, value);
 323         intel_ring_emit(ring, MI_STORE_REGISTER_MEM(1) | MI_SRM_LRM_GLOBAL_GTT);
 324         intel_ring_emit(ring, MSG_FBC_REND_STATE);
 325         intel_ring_emit(ring, ring->scratch.gtt_offset + 256);
 326         intel_ring_advance(ring);
 327
 328         ring->fbc_dirty = false;
 329         return 0;
 330 }
 331
 332 static int
 333 gen7_render_ring_flush(struct intel_engine_cs *ring,
 334                        u32 invalidate_domains, u32 flush_domains)
 335 {
 336         u32 flags = 0;
 337         u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
 338         int ret;
 339
 340         /*
 341          * Ensure that any following seqno writes only happen when the render
 342          * cache is indeed flushed.
 343          *
 344          * Workaround: 4th PIPE_CONTROL command (except the ones with only
 345          * read-cache invalidate bits set) must have the CS_STALL bit set. We
 346          * don't try to be clever and just set it unconditionally.
 347          */
 348         flags |= PIPE_CONTROL_CS_STALL;
 349
 350         /* Just flush everything.  Experiments have shown that reducing the
 351          * number of bits based on the write domains has little performance
 352          * impact.
 353          */
 354         if (flush_domains) {
 355                 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
 356                 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
 357         }
 358         if (invalidate_domains) {
 359                 flags |= PIPE_CONTROL_TLB_INVALIDATE;
 360                 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
 361                 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
 362                 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
 363                 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
 364                 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
 365                 flags |= PIPE_CONTROL_MEDIA_STATE_CLEAR;
 366                 /*
 367                  * TLB invalidate requires a post-sync write.
 368                  */
 369                 flags |= PIPE_CONTROL_QW_WRITE;
 370                 flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
 371
 372                 flags |= PIPE_CONTROL_STALL_AT_SCOREBOARD;
 373
 374                 /* Workaround: we must issue a pipe_control with CS-stall bit
 375                  * set before a pipe_control command that has the state cache
 376                  * invalidate bit set. */
 377                 gen7_render_ring_cs_stall_wa(ring);
 378         }
 379
 380         ret = intel_ring_begin(ring, 4);
 381         if (ret)
 382                 return ret;
 383
 384         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4));
 385         intel_ring_emit(ring, flags);
 386         intel_ring_emit(ring, scratch_addr);
 387         intel_ring_emit(ring, 0);
 388         intel_ring_advance(ring);
 389
 390         if (!invalidate_domains && flush_domains)
 391                 return gen7_ring_fbc_flush(ring, FBC_REND_NUKE);
 392
 393         return 0;
 394 }
 395
 396 static int
 397 gen8_emit_pipe_control(struct intel_engine_cs *ring,
 398                        u32 flags, u32 scratch_addr)
 399 {
 400         int ret;
 401
 402         ret = intel_ring_begin(ring, 6);
 403         if (ret)
 404                 return ret;
 405
 406         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
 407         intel_ring_emit(ring, flags);
 408         intel_ring_emit(ring, scratch_addr);
 409         intel_ring_emit(ring, 0);
 410         intel_ring_emit(ring, 0);
 411         intel_ring_emit(ring, 0);
 412         intel_ring_advance(ring);
 413
 414         return 0;
 415 }
 416
 417 static int
 418 gen8_render_ring_flush(struct intel_engine_cs *ring,
 419                        u32 invalidate_domains, u32 flush_domains)
 420 {
 421         u32 flags = 0;
 422         u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
 423         int ret;
 424
 425         flags |= PIPE_CONTROL_CS_STALL;
 426
 427         if (flush_domains) {
 428                 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
 429                 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
 430         }
 431         if (invalidate_domains) {
 432                 flags |= PIPE_CONTROL_TLB_INVALIDATE;
 433                 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
 434                 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
 435                 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
 436                 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
 437                 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
 438                 flags |= PIPE_CONTROL_QW_WRITE;
 439                 flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
 440
 441                 /* WaCsStallBeforeStateCacheInvalidate:bdw,chv */
 442                 ret = gen8_emit_pipe_control(ring,
 443                                              PIPE_CONTROL_CS_STALL |
 444                                              PIPE_CONTROL_STALL_AT_SCOREBOARD,
 445                                              0);
 446                 if (ret)
 447                         return ret;
 448         }
 449
 450         ret = gen8_emit_pipe_control(ring, flags, scratch_addr);
 451         if (ret)
 452                 return ret;
 453
 454         if (!invalidate_domains && flush_domains)
 455                 return gen7_ring_fbc_flush(ring, FBC_REND_NUKE);
 456
 457         return 0;
 458 }
 459
 460 static void ring_write_tail(struct intel_engine_cs *ring,
 461                             u32 value)
 462 {
 463         struct drm_i915_private *dev_priv = ring->dev->dev_private;
 464         I915_WRITE_TAIL(ring, value);
 465 }
 466
 467 u64 intel_ring_get_active_head(struct intel_engine_cs *ring)
 468 {
 469         struct drm_i915_private *dev_priv = ring->dev->dev_private;
 470         u64 acthd;
 471
 472         if (INTEL_INFO(ring->dev)->gen >= 8)
 473                 acthd = I915_READ64_2x32(RING_ACTHD(ring->mmio_base),
 474                                          RING_ACTHD_UDW(ring->mmio_base));
 475         else if (INTEL_INFO(ring->dev)->gen >= 4)
 476                 acthd = I915_READ(RING_ACTHD(ring->mmio_base));
 477         else
 478                 acthd = I915_READ(ACTHD);
 479
 480         return acthd;
 481 }
 482
 483 static void ring_setup_phys_status_page(struct intel_engine_cs *ring)
 484 {
 485         struct drm_i915_private *dev_priv = ring->dev->dev_private;
 486         u32 addr;
 487
 488         addr = dev_priv->status_page_dmah->busaddr;
 489         if (INTEL_INFO(ring->dev)->gen >= 4)
 490                 addr |= (dev_priv->status_page_dmah->busaddr >> 28) & 0xf0;
 491         I915_WRITE(HWS_PGA, addr);
 492 }
 493
 494 static bool stop_ring(struct intel_engine_cs *ring)
 495 {
 496         struct drm_i915_private *dev_priv = to_i915(ring->dev);
 497
 498         if (!IS_GEN2(ring->dev)) {
 499                 I915_WRITE_MODE(ring, _MASKED_BIT_ENABLE(STOP_RING));
 500                 if (wait_for((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000)) {
 501                         DRM_ERROR("%s : timed out trying to stop ring\n", ring->name);
 502                         /* Sometimes we observe that the idle flag is not
 503                          * set even though the ring is empty. So double
 504                          * check before giving up.
 505                          */
 506                         if (I915_READ_HEAD(ring) != I915_READ_TAIL(ring))
 507                                 return false;
 508                 }
 509         }
 510
 511         I915_WRITE_CTL(ring, 0);
 512         I915_WRITE_HEAD(ring, 0);
 513         ring->write_tail(ring, 0);
 514
 515         if (!IS_GEN2(ring->dev)) {
 516                 (void)I915_READ_CTL(ring);
 517                 I915_WRITE_MODE(ring, _MASKED_BIT_DISABLE(STOP_RING));
 518         }
 519
 520         return (I915_READ_HEAD(ring) & HEAD_ADDR) == 0;
 521 }
 522
 523 static int init_ring_common(struct intel_engine_cs *ring)
 524 {
 525         struct drm_device *dev = ring->dev;
 526         struct drm_i915_private *dev_priv = dev->dev_private;
 527         struct intel_ringbuffer *ringbuf = ring->buffer;
 528         struct drm_i915_gem_object *obj = ringbuf->obj;
 529         int ret = 0;
 530
 531         gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
 532
 533         if (!stop_ring(ring)) {
 534                 /* G45 ring initialization often fails to reset head to zero */
 535                 DRM_DEBUG_KMS("%s head not reset to zero "
 536                               "ctl %08x head %08x tail %08x start %08x\n",
 537                               ring->name,
 538                               I915_READ_CTL(ring),
 539                               I915_READ_HEAD(ring),
 540                               I915_READ_TAIL(ring),
 541                               I915_READ_START(ring));
 542
 543                 if (!stop_ring(ring)) {
 544                         DRM_ERROR("failed to set %s head to zero "
 545                                   "ctl %08x head %08x tail %08x start %08x\n",
 546                                   ring->name,
 547                                   I915_READ_CTL(ring),
 548                                   I915_READ_HEAD(ring),
 549                                   I915_READ_TAIL(ring),
 550                                   I915_READ_START(ring));
 551                         ret = -EIO;
 552                         goto out;
 553                 }
 554         }
 555
 556         if (I915_NEED_GFX_HWS(dev))
 557                 intel_ring_setup_status_page(ring);
 558         else
 559                 ring_setup_phys_status_page(ring);
 560
 561         /* Enforce ordering by reading HEAD register back */
 562         I915_READ_HEAD(ring);
 563
 564         /* Initialize the ring. This must happen _after_ we've cleared the ring
 565          * registers with the above sequence (the readback of the HEAD registers
 566          * also enforces ordering), otherwise the hw might lose the new ring
 567          * register values. */
 568         I915_WRITE_START(ring, i915_gem_obj_ggtt_offset(obj));
 569
 570         /* WaClearRingBufHeadRegAtInit:ctg,elk */
 571         if (I915_READ_HEAD(ring))
 572                 DRM_DEBUG("%s initialization failed [head=%08x], fudging\n",
 573                           ring->name, I915_READ_HEAD(ring));
 574         I915_WRITE_HEAD(ring, 0);
 575         (void)I915_READ_HEAD(ring);
 576
 577         I915_WRITE_CTL(ring,
 578                         ((ringbuf->size - PAGE_SIZE) & RING_NR_PAGES)
 579                         | RING_VALID);
 580
 581         /* If the head is still not zero, the ring is dead */
 582         if (wait_for((I915_READ_CTL(ring) & RING_VALID) != 0 &&
 583                      I915_READ_START(ring) == i915_gem_obj_ggtt_offset(obj) &&
 584                      (I915_READ_HEAD(ring) & HEAD_ADDR) == 0, 50)) {
 585                 DRM_ERROR("%s initialization failed "
 586                           "ctl %08x (valid? %d) head %08x tail %08x start %08x [expected %08lx]\n",
 587                           ring->name,
 588                           I915_READ_CTL(ring), I915_READ_CTL(ring) & RING_VALID,
 589                           I915_READ_HEAD(ring), I915_READ_TAIL(ring),
 590                           I915_READ_START(ring), (unsigned long)i915_gem_obj_ggtt_offset(obj));
 591                 ret = -EIO;
 592                 goto out;
 593         }
 594
 595         ringbuf->head = I915_READ_HEAD(ring);
 596         ringbuf->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
 597         ringbuf->space = intel_ring_space(ringbuf);
 598         ringbuf->last_retired_head = -1;
 599
 600         memset(&ring->hangcheck, 0, sizeof(ring->hangcheck));
 601
 602 out:
 603         gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
 604
 605         return ret;
 606 }
 607
 608 void
 609 intel_fini_pipe_control(struct intel_engine_cs *ring)
 610 {
 611         struct drm_device *dev = ring->dev;
 612
 613         if (ring->scratch.obj == NULL)
 614                 return;
 615
 616         if (INTEL_INFO(dev)->gen >= 5) {
 617                 kunmap(sg_page(ring->scratch.obj->pages->sgl));
 618                 i915_gem_object_ggtt_unpin(ring->scratch.obj);
 619         }
 620
 621         drm_gem_object_unreference(&ring->scratch.obj->base);
 622         ring->scratch.obj = NULL;
 623 }
 624
 625 int
 626 intel_init_pipe_control(struct intel_engine_cs *ring)
 627 {
 628         int ret;
 629
 630         if (ring->scratch.obj)
 631                 return 0;
 632
 633         ring->scratch.obj = i915_gem_alloc_object(ring->dev, 4096);
 634         if (ring->scratch.obj == NULL) {
 635                 DRM_ERROR("Failed to allocate seqno page\n");
 636                 ret = -ENOMEM;
 637                 goto err;
 638         }
 639
 640         ret = i915_gem_object_set_cache_level(ring->scratch.obj, I915_CACHE_LLC);
 641         if (ret)
 642                 goto err_unref;
 643
 644         ret = i915_gem_obj_ggtt_pin(ring->scratch.obj, 4096, 0);
 645         if (ret)
 646                 goto err_unref;
 647
 648         ring->scratch.gtt_offset = i915_gem_obj_ggtt_offset(ring->scratch.obj);
 649         ring->scratch.cpu_page = kmap(sg_page(ring->scratch.obj->pages->sgl));
 650         if (ring->scratch.cpu_page == NULL) {
 651                 ret = -ENOMEM;
 652                 goto err_unpin;
 653         }
 654
 655         DRM_DEBUG_DRIVER("%s pipe control offset: 0x%08x\n",
 656                          ring->name, ring->scratch.gtt_offset);
 657         return 0;
 658
 659 err_unpin:
 660         i915_gem_object_ggtt_unpin(ring->scratch.obj);
 661 err_unref:
 662         drm_gem_object_unreference(&ring->scratch.obj->base);
 663 err:
 664         return ret;
 665 }
 666
 667 static int intel_ring_workarounds_emit(struct intel_engine_cs *ring,
 668                                        struct intel_context *ctx)
 669 {
 670         int ret, i;
 671         struct drm_device *dev = ring->dev;
 672         struct drm_i915_private *dev_priv = dev->dev_private;
 673         struct i915_workarounds *w = &dev_priv->workarounds;
 674
 675         if (WARN_ON(w->count == 0))
 676                 return 0;
 677
 678         ring->gpu_caches_dirty = true;
 679         ret = intel_ring_flush_all_caches(ring);
 680         if (ret)
 681                 return ret;
 682
 683         ret = intel_ring_begin(ring, (w->count * 2 + 2));
 684         if (ret)
 685                 return ret;
 686
 687         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(w->count));
 688         for (i = 0; i < w->count; i++) {
 689                 intel_ring_emit(ring, w->reg[i].addr);
 690                 intel_ring_emit(ring, w->reg[i].value);
 691         }
 692         intel_ring_emit(ring, MI_NOOP);
 693
 694         intel_ring_advance(ring);
 695
 696         ring->gpu_caches_dirty = true;
 697         ret = intel_ring_flush_all_caches(ring);
 698         if (ret)
 699                 return ret;
 700
 701         DRM_DEBUG_DRIVER("Number of Workarounds emitted: %d\n", w->count);
 702
 703         return 0;
 704 }
 705
 706 static int wa_add(struct drm_i915_private *dev_priv,
 707                   const u32 addr, const u32 mask, const u32 val)
 708 {
 709         const u32 idx = dev_priv->workarounds.count;
 710
 711         if (WARN_ON(idx >= I915_MAX_WA_REGS))
 712                 return -ENOSPC;
 713
 714         dev_priv->workarounds.reg[idx].addr = addr;
 715         dev_priv->workarounds.reg[idx].value = val;
 716         dev_priv->workarounds.reg[idx].mask = mask;
 717
 718         dev_priv->workarounds.count++;
 719
 720         return 0;
 721 }
 722
 723 #define WA_REG(addr, mask, val) { \
 724                 const int r = wa_add(dev_priv, (addr), (mask), (val)); \
 725                 if (r) \
 726                         return r; \
 727         }
 728
 729 #define WA_SET_BIT_MASKED(addr, mask) \
 730         WA_REG(addr, (mask), _MASKED_BIT_ENABLE(mask))
 731
 732 #define WA_CLR_BIT_MASKED(addr, mask) \
 733         WA_REG(addr, (mask), _MASKED_BIT_DISABLE(mask))
 734
 735 #define WA_SET_FIELD_MASKED(addr, mask, value) \
 736         WA_REG(addr, mask, _MASKED_FIELD(mask, value))
 737
 738 #define WA_SET_BIT(addr, mask) WA_REG(addr, mask, I915_READ(addr) | (mask))
 739 #define WA_CLR_BIT(addr, mask) WA_REG(addr, mask, I915_READ(addr) & ~(mask))
 740
 741 #define WA_WRITE(addr, val) WA_REG(addr, 0xffffffff, val)
 742
 743 static int bdw_init_workarounds(struct intel_engine_cs *ring)
 744 {
 745         struct drm_device *dev = ring->dev;
 746         struct drm_i915_private *dev_priv = dev->dev_private;
 747
 748         /* WaDisablePartialInstShootdown:bdw */
 749         /* WaDisableThreadStallDopClockGating:bdw (pre-production) */
 750         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
 751                           PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE |
 752                           STALL_DOP_GATING_DISABLE);
 753
 754         /* WaDisableDopClockGating:bdw */
 755         WA_SET_BIT_MASKED(GEN7_ROW_CHICKEN2,
 756                           DOP_CLOCK_GATING_DISABLE);
 757
 758         WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
 759                           GEN8_SAMPLER_POWER_BYPASS_DIS);
 760
 761         /* Use Force Non-Coherent whenever executing a 3D context. This is a
 762          * workaround for for a possible hang in the unlikely event a TLB
 763          * invalidation occurs during a PSD flush.
 764          */
 765         /* WaDisableFenceDestinationToSLM:bdw (GT3 pre-production) */
 766         WA_SET_BIT_MASKED(HDC_CHICKEN0,
 767                           HDC_FORCE_NON_COHERENT |
 768                           (IS_BDW_GT3(dev) ? HDC_FENCE_DEST_SLM_DISABLE : 0));
 769
 770         /* Wa4x4STCOptimizationDisable:bdw */
 771         WA_SET_BIT_MASKED(CACHE_MODE_1,
 772                           GEN8_4x4_STC_OPTIMIZATION_DISABLE);
 773
 774         /*
 775          * BSpec recommends 8x4 when MSAA is used,
 776          * however in practice 16x4 seems fastest.
 777          *
 778          * Note that PS/WM thread counts depend on the WIZ hashing
 779          * disable bit, which we don't touch here, but it's good
 780          * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
 781          */
 782         WA_SET_FIELD_MASKED(GEN7_GT_MODE,
 783                             GEN6_WIZ_HASHING_MASK,
 784                             GEN6_WIZ_HASHING_16x4);
 785
 786         return 0;
 787 }
 788
 789 static int chv_init_workarounds(struct intel_engine_cs *ring)
 790 {
 791         struct drm_device *dev = ring->dev;
 792         struct drm_i915_private *dev_priv = dev->dev_private;
 793
 794         /* WaDisablePartialInstShootdown:chv */
 795         /* WaDisableThreadStallDopClockGating:chv */
 796         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
 797                           PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE |
 798                           STALL_DOP_GATING_DISABLE);
 799
 800         /* Use Force Non-Coherent whenever executing a 3D context. This is a
 801          * workaround for a possible hang in the unlikely event a TLB
 802          * invalidation occurs during a PSD flush.
 803          */
 804         /* WaForceEnableNonCoherent:chv */
 805         /* WaHdcDisableFetchWhenMasked:chv */
 806         WA_SET_BIT_MASKED(HDC_CHICKEN0,
 807                           HDC_FORCE_NON_COHERENT |
 808                           HDC_DONOT_FETCH_MEM_WHEN_MASKED);
 809
 810         return 0;
 811 }
 812
 813 int init_workarounds_ring(struct intel_engine_cs *ring)
 814 {
 815         struct drm_device *dev = ring->dev;
 816         struct drm_i915_private *dev_priv = dev->dev_private;
 817
 818         WARN_ON(ring->id != RCS);
 819
 820         dev_priv->workarounds.count = 0;
 821
 822         if (IS_BROADWELL(dev))
 823                 return bdw_init_workarounds(ring);
 824
 825         if (IS_CHERRYVIEW(dev))
 826                 return chv_init_workarounds(ring);
 827
 828         return 0;
 829 }
 830
 831 static int init_render_ring(struct intel_engine_cs *ring)
 832 {
 833         struct drm_device *dev = ring->dev;
 834         struct drm_i915_private *dev_priv = dev->dev_private;
 835         int ret = init_ring_common(ring);
 836         if (ret)
 837                 return ret;
 838
 839         /* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */
 840         if (INTEL_INFO(dev)->gen >= 4 && INTEL_INFO(dev)->gen < 7)
 841                 I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH));
 842
 843         /* We need to disable the AsyncFlip performance optimisations in order
 844          * to use MI_WAIT_FOR_EVENT within the CS. It should already be
 845          * programmed to '1' on all products.
 846          *
 847          * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
 848          */
 849         if (INTEL_INFO(dev)->gen >= 6 && INTEL_INFO(dev)->gen < 9)
 850                 I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
 851
 852         /* Required for the hardware to program scanline values for waiting */
 853         /* WaEnableFlushTlbInvalidationMode:snb */
 854         if (INTEL_INFO(dev)->gen == 6)
 855                 I915_WRITE(GFX_MODE,
 856                            _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_EXPLICIT));
 857
 858         /* WaBCSVCSTlbInvalidationMode:ivb,vlv,hsw */
 859         if (IS_GEN7(dev))
 860                 I915_WRITE(GFX_MODE_GEN7,
 861                            _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_EXPLICIT) |
 862                            _MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
 863
 864         if (INTEL_INFO(dev)->gen >= 5) {
 865                 ret = intel_init_pipe_control(ring);
 866                 if (ret)
 867                         return ret;
 868         }
 869
 870         if (IS_GEN6(dev)) {
 871                 /* From the Sandybridge PRM, volume 1 part 3, page 24:
 872                  * "If this bit is set, STCunit will have LRA as replacement
 873                  *  policy. [...] This bit must be reset.  LRA replacement
 874                  *  policy is not supported."
 875                  */
 876                 I915_WRITE(CACHE_MODE_0,
 877                            _MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB));
 878         }
 879
 880         if (INTEL_INFO(dev)->gen >= 6)
 881                 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
 882
 883         if (HAS_L3_DPF(dev))
 884                 I915_WRITE_IMR(ring, ~GT_PARITY_ERROR(dev));
 885
 886         return init_workarounds_ring(ring);
 887 }
 888
 889 static void render_ring_cleanup(struct intel_engine_cs *ring)
 890 {
 891         struct drm_device *dev = ring->dev;
 892         struct drm_i915_private *dev_priv = dev->dev_private;
 893
 894         if (dev_priv->semaphore_obj) {
 895                 i915_gem_object_ggtt_unpin(dev_priv->semaphore_obj);
 896                 drm_gem_object_unreference(&dev_priv->semaphore_obj->base);
 897                 dev_priv->semaphore_obj = NULL;
 898         }
 899
 900         intel_fini_pipe_control(ring);
 901 }
 902
 903 static int gen8_rcs_signal(struct intel_engine_cs *signaller,
 904                            unsigned int num_dwords)
 905 {
 906 #define MBOX_UPDATE_DWORDS 8
 907         struct drm_device *dev = signaller->dev;
 908         struct drm_i915_private *dev_priv = dev->dev_private;
 909         struct intel_engine_cs *waiter;
 910         int i, ret, num_rings;
 911
 912         num_rings = hweight32(INTEL_INFO(dev)->ring_mask);
 913         num_dwords += (num_rings-1) * MBOX_UPDATE_DWORDS;
 914 #undef MBOX_UPDATE_DWORDS
 915
 916         ret = intel_ring_begin(signaller, num_dwords);
 917         if (ret)
 918                 return ret;
 919
 920         for_each_ring(waiter, dev_priv, i) {
 921                 u64 gtt_offset = signaller->semaphore.signal_ggtt[i];
 922                 if (gtt_offset == MI_SEMAPHORE_SYNC_INVALID)
 923                         continue;
 924
 925                 intel_ring_emit(signaller, GFX_OP_PIPE_CONTROL(6));
 926                 intel_ring_emit(signaller, PIPE_CONTROL_GLOBAL_GTT_IVB |
 927                                            PIPE_CONTROL_QW_WRITE |
 928                                            PIPE_CONTROL_FLUSH_ENABLE);
 929                 intel_ring_emit(signaller, lower_32_bits(gtt_offset));
 930                 intel_ring_emit(signaller, upper_32_bits(gtt_offset));
 931                 intel_ring_emit(signaller, signaller->outstanding_lazy_seqno);
 932                 intel_ring_emit(signaller, 0);
 933                 intel_ring_emit(signaller, MI_SEMAPHORE_SIGNAL |
 934                                            MI_SEMAPHORE_TARGET(waiter->id));
 935                 intel_ring_emit(signaller, 0);
 936         }
 937
 938         return 0;
 939 }
 940
 941 static int gen8_xcs_signal(struct intel_engine_cs *signaller,
 942                            unsigned int num_dwords)
 943 {
 944 #define MBOX_UPDATE_DWORDS 6
 945         struct drm_device *dev = signaller->dev;
 946         struct drm_i915_private *dev_priv = dev->dev_private;
 947         struct intel_engine_cs *waiter;
 948         int i, ret, num_rings;
 949
 950         num_rings = hweight32(INTEL_INFO(dev)->ring_mask);
 951         num_dwords += (num_rings-1) * MBOX_UPDATE_DWORDS;
 952 #undef MBOX_UPDATE_DWORDS
 953
 954         ret = intel_ring_begin(signaller, num_dwords);
 955         if (ret)
 956                 return ret;
 957
 958         for_each_ring(waiter, dev_priv, i) {
 959                 u64 gtt_offset = signaller->semaphore.signal_ggtt[i];
 960                 if (gtt_offset == MI_SEMAPHORE_SYNC_INVALID)
 961                         continue;
 962
 963                 intel_ring_emit(signaller, (MI_FLUSH_DW + 1) |
 964                                            MI_FLUSH_DW_OP_STOREDW);
 965                 intel_ring_emit(signaller, lower_32_bits(gtt_offset) |
 966                                            MI_FLUSH_DW_USE_GTT);
 967                 intel_ring_emit(signaller, upper_32_bits(gtt_offset));
 968                 intel_ring_emit(signaller, signaller->outstanding_lazy_seqno);
 969                 intel_ring_emit(signaller, MI_SEMAPHORE_SIGNAL |
 970                                            MI_SEMAPHORE_TARGET(waiter->id));
 971                 intel_ring_emit(signaller, 0);
 972         }
 973
 974         return 0;
 975 }
 976
 977 static int gen6_signal(struct intel_engine_cs *signaller,
 978                        unsigned int num_dwords)
 979 {
 980         struct drm_device *dev = signaller->dev;
 981         struct drm_i915_private *dev_priv = dev->dev_private;
 982         struct intel_engine_cs *useless;
 983         int i, ret, num_rings;
 984
 985 #define MBOX_UPDATE_DWORDS 3
 986         num_rings = hweight32(INTEL_INFO(dev)->ring_mask);
 987         num_dwords += round_up((num_rings-1) * MBOX_UPDATE_DWORDS, 2);
 988 #undef MBOX_UPDATE_DWORDS
 989
 990         ret = intel_ring_begin(signaller, num_dwords);
 991         if (ret)
 992                 return ret;
 993
 994         for_each_ring(useless, dev_priv, i) {
 995                 u32 mbox_reg = signaller->semaphore.mbox.signal[i];
 996                 if (mbox_reg != GEN6_NOSYNC) {
 997                         intel_ring_emit(signaller, MI_LOAD_REGISTER_IMM(1));
 998                         intel_ring_emit(signaller, mbox_reg);
 999                         intel_ring_emit(signaller, signaller->outstanding_lazy_seqno);
1000                 }
1001         }
1002
1003         /* If num_dwords was rounded, make sure the tail pointer is correct */
1004         if (num_rings % 2 == 0)
1005                 intel_ring_emit(signaller, MI_NOOP);
1006
1007         return 0;
1008 }
1009
1010 /**
1011  * gen6_add_request - Update the semaphore mailbox registers
1012  *
1013  * @ring - ring that is adding a request
1014  * @seqno - return seqno stuck into the ring
1015  *
1016  * Update the mailbox registers in the *other* rings with the current seqno.
1017  * This acts like a signal in the canonical semaphore.
1018  */
1019 static int
1020 gen6_add_request(struct intel_engine_cs *ring)
1021 {
1022         int ret;
1023
1024         if (ring->semaphore.signal)
1025                 ret = ring->semaphore.signal(ring, 4);
1026         else
1027                 ret = intel_ring_begin(ring, 4);
1028
1029         if (ret)
1030                 return ret;
1031
1032         intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
1033         intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
1034         intel_ring_emit(ring, ring->outstanding_lazy_seqno);
1035         intel_ring_emit(ring, MI_USER_INTERRUPT);
1036         __intel_ring_advance(ring);
1037
1038         return 0;
1039 }
1040
1041 static inline bool i915_gem_has_seqno_wrapped(struct drm_device *dev,
1042                                               u32 seqno)
1043 {
1044         struct drm_i915_private *dev_priv = dev->dev_private;
1045         return dev_priv->last_seqno < seqno;
1046 }
1047
1048 /**
1049  * intel_ring_sync - sync the waiter to the signaller on seqno
1050  *
1051  * @waiter - ring that is waiting
1052  * @signaller - ring which has, or will signal
1053  * @seqno - seqno which the waiter will block on
1054  */
1055
1056 static int
1057 gen8_ring_sync(struct intel_engine_cs *waiter,
1058                struct intel_engine_cs *signaller,
1059                u32 seqno)
1060 {
1061         struct drm_i915_private *dev_priv = waiter->dev->dev_private;
1062         int ret;
1063
1064         ret = intel_ring_begin(waiter, 4);
1065         if (ret)
1066                 return ret;
1067
1068         intel_ring_emit(waiter, MI_SEMAPHORE_WAIT |
1069                                 MI_SEMAPHORE_GLOBAL_GTT |
1070                                 MI_SEMAPHORE_POLL |
1071                                 MI_SEMAPHORE_SAD_GTE_SDD);
1072         intel_ring_emit(waiter, seqno);
1073         intel_ring_emit(waiter,
1074                         lower_32_bits(GEN8_WAIT_OFFSET(waiter, signaller->id)));
1075         intel_ring_emit(waiter,
1076                         upper_32_bits(GEN8_WAIT_OFFSET(waiter, signaller->id)));
1077         intel_ring_advance(waiter);
1078         return 0;
1079 }
1080
1081 static int
1082 gen6_ring_sync(struct intel_engine_cs *waiter,
1083                struct intel_engine_cs *signaller,
1084                u32 seqno)
1085 {
1086         u32 dw1 = MI_SEMAPHORE_MBOX |
1087                   MI_SEMAPHORE_COMPARE |
1088                   MI_SEMAPHORE_REGISTER;
1089         u32 wait_mbox = signaller->semaphore.mbox.wait[waiter->id];
1090         int ret;
1091
1092         /* Throughout all of the GEM code, seqno passed implies our current
1093          * seqno is >= the last seqno executed. However for hardware the
1094          * comparison is strictly greater than.
1095          */
1096         seqno -= 1;
1097
1098         WARN_ON(wait_mbox == MI_SEMAPHORE_SYNC_INVALID);
1099
1100         ret = intel_ring_begin(waiter, 4);
1101         if (ret)
1102                 return ret;
1103
1104         /* If seqno wrap happened, omit the wait with no-ops */
1105         if (likely(!i915_gem_has_seqno_wrapped(waiter->dev, seqno))) {
1106                 intel_ring_emit(waiter, dw1 | wait_mbox);
1107                 intel_ring_emit(waiter, seqno);
1108                 intel_ring_emit(waiter, 0);
1109                 intel_ring_emit(waiter, MI_NOOP);
1110         } else {
1111                 intel_ring_emit(waiter, MI_NOOP);
1112                 intel_ring_emit(waiter, MI_NOOP);
1113                 intel_ring_emit(waiter, MI_NOOP);
1114                 intel_ring_emit(waiter, MI_NOOP);
1115         }
1116         intel_ring_advance(waiter);
1117
1118         return 0;
1119 }
1120
1121 #define PIPE_CONTROL_FLUSH(ring__, addr__)                                      \
1122 do {                                                                    \
1123         intel_ring_emit(ring__, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |                \
1124                  PIPE_CONTROL_DEPTH_STALL);                             \
1125         intel_ring_emit(ring__, (addr__) | PIPE_CONTROL_GLOBAL_GTT);                    \
1126         intel_ring_emit(ring__, 0);                                                     \
1127         intel_ring_emit(ring__, 0);                                                     \
1128 } while (0)
1129
1130 static int
1131 pc_render_add_request(struct intel_engine_cs *ring)
1132 {
1133         u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
1134         int ret;
1135
1136         /* For Ironlake, MI_USER_INTERRUPT was deprecated and apparently
1137          * incoherent with writes to memory, i.e. completely fubar,
1138          * so we need to use PIPE_NOTIFY instead.
1139          *
1140          * However, we also need to workaround the qword write
1141          * incoherence by flushing the 6 PIPE_NOTIFY buffers out to
1142          * memory before requesting an interrupt.
1143          */
1144         ret = intel_ring_begin(ring, 32);
1145         if (ret)
1146                 return ret;
1147
1148         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |
1149                         PIPE_CONTROL_WRITE_FLUSH |
1150                         PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE);
1151         intel_ring_emit(ring, ring->scratch.gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
1152         intel_ring_emit(ring, ring->outstanding_lazy_seqno);
1153         intel_ring_emit(ring, 0);
1154         PIPE_CONTROL_FLUSH(ring, scratch_addr);
1155         scratch_addr += 2 * CACHELINE_BYTES; /* write to separate cachelines */
1156         PIPE_CONTROL_FLUSH(ring, scratch_addr);
1157         scratch_addr += 2 * CACHELINE_BYTES;
1158         PIPE_CONTROL_FLUSH(ring, scratch_addr);
1159         scratch_addr += 2 * CACHELINE_BYTES;
1160         PIPE_CONTROL_FLUSH(ring, scratch_addr);
1161         scratch_addr += 2 * CACHELINE_BYTES;
1162         PIPE_CONTROL_FLUSH(ring, scratch_addr);
1163         scratch_addr += 2 * CACHELINE_BYTES;
1164         PIPE_CONTROL_FLUSH(ring, scratch_addr);
1165
1166         intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |
1167                         PIPE_CONTROL_WRITE_FLUSH |
1168                         PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE |
1169                         PIPE_CONTROL_NOTIFY);
1170         intel_ring_emit(ring, ring->scratch.gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
1171         intel_ring_emit(ring, ring->outstanding_lazy_seqno);
1172         intel_ring_emit(ring, 0);
1173         __intel_ring_advance(ring);
1174
1175         return 0;
1176 }
1177
1178 static u32
1179 gen6_ring_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
1180 {
1181         /* Workaround to force correct ordering between irq and seqno writes on
1182          * ivb (and maybe also on snb) by reading from a CS register (like
1183          * ACTHD) before reading the status page. */
1184         if (!lazy_coherency) {
1185                 struct drm_i915_private *dev_priv = ring->dev->dev_private;
1186                 POSTING_READ(RING_ACTHD(ring->mmio_base));
1187         }
1188
1189         return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
1190 }
1191
1192 static u32
1193 ring_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
1194 {
1195         return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
1196 }
1197
1198 static void
1199 ring_set_seqno(struct intel_engine_cs *ring, u32 seqno)
1200 {
1201         intel_write_status_page(ring, I915_GEM_HWS_INDEX, seqno);
1202 }
1203
1204 static u32
1205 pc_render_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
1206 {
1207         return ring->scratch.cpu_page[0];
1208 }
1209
1210 static void
1211 pc_render_set_seqno(struct intel_engine_cs *ring, u32 seqno)
1212 {
1213         ring->scratch.cpu_page[0] = seqno;
1214 }
1215
1216 static bool
1217 gen5_ring_get_irq(struct intel_engine_cs *ring)
1218 {
1219         struct drm_device *dev = ring->dev;
1220         struct drm_i915_private *dev_priv = dev->dev_private;
1221         unsigned long flags;
1222
1223         if (WARN_ON(!intel_irqs_enabled(dev_priv)))
1224                 return false;
1225
1226         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1227         if (ring->irq_refcount++ == 0)
1228                 gen5_enable_gt_irq(dev_priv, ring->irq_enable_mask);
1229         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1230
1231         return true;
1232 }
1233
1234 static void
1235 gen5_ring_put_irq(struct intel_engine_cs *ring)
1236 {
1237         struct drm_device *dev = ring->dev;
1238         struct drm_i915_private *dev_priv = dev->dev_private;
1239         unsigned long flags;
1240
1241         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1242         if (--ring->irq_refcount == 0)
1243                 gen5_disable_gt_irq(dev_priv, ring->irq_enable_mask);
1244         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1245 }
1246
1247 static bool
1248 i9xx_ring_get_irq(struct intel_engine_cs *ring)
1249 {
1250         struct drm_device *dev = ring->dev;
1251         struct drm_i915_private *dev_priv = dev->dev_private;
1252         unsigned long flags;
1253
1254         if (!intel_irqs_enabled(dev_priv))
1255                 return false;
1256
1257         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1258         if (ring->irq_refcount++ == 0) {
1259                 dev_priv->irq_mask &= ~ring->irq_enable_mask;
1260                 I915_WRITE(IMR, dev_priv->irq_mask);
1261                 POSTING_READ(IMR);
1262         }
1263         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1264
1265         return true;
1266 }
1267
1268 static void
1269 i9xx_ring_put_irq(struct intel_engine_cs *ring)
1270 {
1271         struct drm_device *dev = ring->dev;
1272         struct drm_i915_private *dev_priv = dev->dev_private;
1273         unsigned long flags;
1274
1275         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1276         if (--ring->irq_refcount == 0) {
1277                 dev_priv->irq_mask |= ring->irq_enable_mask;
1278                 I915_WRITE(IMR, dev_priv->irq_mask);
1279                 POSTING_READ(IMR);
1280         }
1281         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1282 }
1283
1284 static bool
1285 i8xx_ring_get_irq(struct intel_engine_cs *ring)
1286 {
1287         struct drm_device *dev = ring->dev;
1288         struct drm_i915_private *dev_priv = dev->dev_private;
1289         unsigned long flags;
1290
1291         if (!intel_irqs_enabled(dev_priv))
1292                 return false;
1293
1294         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1295         if (ring->irq_refcount++ == 0) {
1296                 dev_priv->irq_mask &= ~ring->irq_enable_mask;
1297                 I915_WRITE16(IMR, dev_priv->irq_mask);
1298                 POSTING_READ16(IMR);
1299         }
1300         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1301
1302         return true;
1303 }
1304
1305 static void
1306 i8xx_ring_put_irq(struct intel_engine_cs *ring)
1307 {
1308         struct drm_device *dev = ring->dev;
1309         struct drm_i915_private *dev_priv = dev->dev_private;
1310         unsigned long flags;
1311
1312         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1313         if (--ring->irq_refcount == 0) {
1314                 dev_priv->irq_mask |= ring->irq_enable_mask;
1315                 I915_WRITE16(IMR, dev_priv->irq_mask);
1316                 POSTING_READ16(IMR);
1317         }
1318         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1319 }
1320
1321 void intel_ring_setup_status_page(struct intel_engine_cs *ring)
1322 {
1323         struct drm_device *dev = ring->dev;
1324         struct drm_i915_private *dev_priv = ring->dev->dev_private;
1325         u32 mmio = 0;
1326
1327         /* The ring status page addresses are no longer next to the rest of
1328          * the ring registers as of gen7.
1329          */
1330         if (IS_GEN7(dev)) {
1331                 switch (ring->id) {
1332                 case RCS:
1333                         mmio = RENDER_HWS_PGA_GEN7;
1334                         break;
1335                 case BCS:
1336                         mmio = BLT_HWS_PGA_GEN7;
1337                         break;
1338                 /*
1339                  * VCS2 actually doesn't exist on Gen7. Only shut up
1340                  * gcc switch check warning
1341                  */
1342                 case VCS2:
1343                 case VCS:
1344                         mmio = BSD_HWS_PGA_GEN7;
1345                         break;
1346                 case VECS:
1347                         mmio = VEBOX_HWS_PGA_GEN7;
1348                         break;
1349                 }
1350         } else if (IS_GEN6(ring->dev)) {
1351                 mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
1352         } else {
1353                 /* XXX: gen8 returns to sanity */
1354                 mmio = RING_HWS_PGA(ring->mmio_base);
1355         }
1356
1357         I915_WRITE(mmio, (u32)ring->status_page.gfx_addr);
1358         POSTING_READ(mmio);
1359
1360         /*
1361          * Flush the TLB for this page
1362          *
1363          * FIXME: These two bits have disappeared on gen8, so a question
1364          * arises: do we still need this and if so how should we go about
1365          * invalidating the TLB?
1366          */
1367         if (INTEL_INFO(dev)->gen >= 6 && INTEL_INFO(dev)->gen < 8) {
1368                 u32 reg = RING_INSTPM(ring->mmio_base);
1369
1370                 /* ring should be idle before issuing a sync flush*/
1371                 WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0);
1372
1373                 I915_WRITE(reg,
1374                            _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
1375                                               INSTPM_SYNC_FLUSH));
1376                 if (wait_for((I915_READ(reg) & INSTPM_SYNC_FLUSH) == 0,
1377                              1000))
1378                         DRM_ERROR("%s: wait for SyncFlush to complete for TLB invalidation timed out\n",
1379                                   ring->name);
1380         }
1381 }
1382
1383 static int
1384 bsd_ring_flush(struct intel_engine_cs *ring,
1385                u32     invalidate_domains,
1386                u32     flush_domains)
1387 {
1388         int ret;
1389
1390         ret = intel_ring_begin(ring, 2);
1391         if (ret)
1392                 return ret;
1393
1394         intel_ring_emit(ring, MI_FLUSH);
1395         intel_ring_emit(ring, MI_NOOP);
1396         intel_ring_advance(ring);
1397         return 0;
1398 }
1399
1400 static int
1401 i9xx_add_request(struct intel_engine_cs *ring)
1402 {
1403         int ret;
1404
1405         ret = intel_ring_begin(ring, 4);
1406         if (ret)
1407                 return ret;
1408
1409         intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
1410         intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
1411         intel_ring_emit(ring, ring->outstanding_lazy_seqno);
1412         intel_ring_emit(ring, MI_USER_INTERRUPT);
1413         __intel_ring_advance(ring);
1414
1415         return 0;
1416 }
1417
1418 static bool
1419 gen6_ring_get_irq(struct intel_engine_cs *ring)
1420 {
1421         struct drm_device *dev = ring->dev;
1422         struct drm_i915_private *dev_priv = dev->dev_private;
1423         unsigned long flags;
1424
1425         if (WARN_ON(!intel_irqs_enabled(dev_priv)))
1426                 return false;
1427
1428         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1429         if (ring->irq_refcount++ == 0) {
1430                 if (HAS_L3_DPF(dev) && ring->id == RCS)
1431                         I915_WRITE_IMR(ring,
1432                                        ~(ring->irq_enable_mask |
1433                                          GT_PARITY_ERROR(dev)));
1434                 else
1435                         I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
1436                 gen5_enable_gt_irq(dev_priv, ring->irq_enable_mask);
1437         }
1438         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1439
1440         return true;
1441 }
1442
1443 static void
1444 gen6_ring_put_irq(struct intel_engine_cs *ring)
1445 {
1446         struct drm_device *dev = ring->dev;
1447         struct drm_i915_private *dev_priv = dev->dev_private;
1448         unsigned long flags;
1449
1450         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1451         if (--ring->irq_refcount == 0) {
1452                 if (HAS_L3_DPF(dev) && ring->id == RCS)
1453                         I915_WRITE_IMR(ring, ~GT_PARITY_ERROR(dev));
1454                 else
1455                         I915_WRITE_IMR(ring, ~0);
1456                 gen5_disable_gt_irq(dev_priv, ring->irq_enable_mask);
1457         }
1458         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1459 }
1460
1461 static bool
1462 hsw_vebox_get_irq(struct intel_engine_cs *ring)
1463 {
1464         struct drm_device *dev = ring->dev;
1465         struct drm_i915_private *dev_priv = dev->dev_private;
1466         unsigned long flags;
1467
1468         if (WARN_ON(!intel_irqs_enabled(dev_priv)))
1469                 return false;
1470
1471         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1472         if (ring->irq_refcount++ == 0) {
1473                 I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
1474                 gen6_enable_pm_irq(dev_priv, ring->irq_enable_mask);
1475         }
1476         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1477
1478         return true;
1479 }
1480
1481 static void
1482 hsw_vebox_put_irq(struct intel_engine_cs *ring)
1483 {
1484         struct drm_device *dev = ring->dev;
1485         struct drm_i915_private *dev_priv = dev->dev_private;
1486         unsigned long flags;
1487
1488         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1489         if (--ring->irq_refcount == 0) {
1490                 I915_WRITE_IMR(ring, ~0);
1491                 gen6_disable_pm_irq(dev_priv, ring->irq_enable_mask);
1492         }
1493         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1494 }
1495
1496 static bool
1497 gen8_ring_get_irq(struct intel_engine_cs *ring)
1498 {
1499         struct drm_device *dev = ring->dev;
1500         struct drm_i915_private *dev_priv = dev->dev_private;
1501         unsigned long flags;
1502
1503         if (WARN_ON(!intel_irqs_enabled(dev_priv)))
1504                 return false;
1505
1506         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1507         if (ring->irq_refcount++ == 0) {
1508                 if (HAS_L3_DPF(dev) && ring->id == RCS) {
1509                         I915_WRITE_IMR(ring,
1510                                        ~(ring->irq_enable_mask |
1511                                          GT_RENDER_L3_PARITY_ERROR_INTERRUPT));
1512                 } else {
1513                         I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
1514                 }
1515                 POSTING_READ(RING_IMR(ring->mmio_base));
1516         }
1517         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1518
1519         return true;
1520 }
1521
1522 static void
1523 gen8_ring_put_irq(struct intel_engine_cs *ring)
1524 {
1525         struct drm_device *dev = ring->dev;
1526         struct drm_i915_private *dev_priv = dev->dev_private;
1527         unsigned long flags;
1528
1529         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1530         if (--ring->irq_refcount == 0) {
1531                 if (HAS_L3_DPF(dev) && ring->id == RCS) {
1532                         I915_WRITE_IMR(ring,
1533                                        ~GT_RENDER_L3_PARITY_ERROR_INTERRUPT);
1534                 } else {
1535                         I915_WRITE_IMR(ring, ~0);
1536                 }
1537                 POSTING_READ(RING_IMR(ring->mmio_base));
1538         }
1539         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1540 }
1541
1542 static int
1543 i965_dispatch_execbuffer(struct intel_engine_cs *ring,
1544                          u64 offset, u32 length,
1545                          unsigned flags)
1546 {
1547         int ret;
1548
1549         ret = intel_ring_begin(ring, 2);
1550         if (ret)
1551                 return ret;
1552
1553         intel_ring_emit(ring,
1554                         MI_BATCH_BUFFER_START |
1555                         MI_BATCH_GTT |
1556                         (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965));
1557         intel_ring_emit(ring, offset);
1558         intel_ring_advance(ring);
1559
1560         return 0;
1561 }
1562
1563 /* Just userspace ABI convention to limit the wa batch bo to a resonable size */
1564 #define I830_BATCH_LIMIT (256*1024)
1565 #define I830_TLB_ENTRIES (2)
1566 #define I830_WA_SIZE max(I830_TLB_ENTRIES*4096, I830_BATCH_LIMIT)
1567 static int
1568 i830_dispatch_execbuffer(struct intel_engine_cs *ring,
1569                                 u64 offset, u32 len,
1570                                 unsigned flags)
1571 {
1572         u32 cs_offset = ring->scratch.gtt_offset;
1573         int ret;
1574
1575         ret = intel_ring_begin(ring, 6);
1576         if (ret)
1577                 return ret;
1578
1579         /* Evict the invalid PTE TLBs */
1580         intel_ring_emit(ring, COLOR_BLT_CMD | BLT_WRITE_RGBA);
1581         intel_ring_emit(ring, BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | 4096);
1582         intel_ring_emit(ring, I830_TLB_ENTRIES << 16 | 4); /* load each page */
1583         intel_ring_emit(ring, cs_offset);
1584         intel_ring_emit(ring, 0xdeadbeef);
1585         intel_ring_emit(ring, MI_NOOP);
1586         intel_ring_advance(ring);
1587
1588         if ((flags & I915_DISPATCH_PINNED) == 0) {
1589                 if (len > I830_BATCH_LIMIT)
1590                         return -ENOSPC;
1591
1592                 ret = intel_ring_begin(ring, 6 + 2);
1593                 if (ret)
1594                         return ret;
1595
1596                 /* Blit the batch (which has now all relocs applied) to the
1597                  * stable batch scratch bo area (so that the CS never
1598                  * stumbles over its tlb invalidation bug) ...
1599                  */
1600                 intel_ring_emit(ring, SRC_COPY_BLT_CMD | BLT_WRITE_RGBA);
1601                 intel_ring_emit(ring, BLT_DEPTH_32 | BLT_ROP_SRC_COPY | 4096);
1602                 intel_ring_emit(ring, DIV_ROUND_UP(len, 4096) << 16 | 4096);
1603                 intel_ring_emit(ring, cs_offset);
1604                 intel_ring_emit(ring, 4096);
1605                 intel_ring_emit(ring, offset);
1606
1607                 intel_ring_emit(ring, MI_FLUSH);
1608                 intel_ring_emit(ring, MI_NOOP);
1609                 intel_ring_advance(ring);
1610
1611                 /* ... and execute it. */
1612                 offset = cs_offset;
1613         }
1614
1615         ret = intel_ring_begin(ring, 4);
1616         if (ret)
1617                 return ret;
1618
1619         intel_ring_emit(ring, MI_BATCH_BUFFER);
1620         intel_ring_emit(ring, offset | (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE));
1621         intel_ring_emit(ring, offset + len - 8);
1622         intel_ring_emit(ring, MI_NOOP);
1623         intel_ring_advance(ring);
1624
1625         return 0;
1626 }
1627
1628 static int
1629 i915_dispatch_execbuffer(struct intel_engine_cs *ring,
1630                          u64 offset, u32 len,
1631                          unsigned flags)
1632 {
1633         int ret;
1634
1635         ret = intel_ring_begin(ring, 2);
1636         if (ret)
1637                 return ret;
1638
1639         intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_GTT);
1640         intel_ring_emit(ring, offset | (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE));
1641         intel_ring_advance(ring);
1642
1643         return 0;
1644 }
1645
1646 static void cleanup_status_page(struct intel_engine_cs *ring)
1647 {
1648         struct drm_i915_gem_object *obj;
1649
1650         obj = ring->status_page.obj;
1651         if (obj == NULL)
1652                 return;
1653
1654         kunmap(sg_page(obj->pages->sgl));
1655         i915_gem_object_ggtt_unpin(obj);
1656         drm_gem_object_unreference(&obj->base);
1657         ring->status_page.obj = NULL;
1658 }
1659
1660 static int init_status_page(struct intel_engine_cs *ring)
1661 {
1662         struct drm_i915_gem_object *obj;
1663
1664         if ((obj = ring->status_page.obj) == NULL) {
1665                 unsigned flags;
1666                 int ret;
1667
1668                 obj = i915_gem_alloc_object(ring->dev, 4096);
1669                 if (obj == NULL) {
1670                         DRM_ERROR("Failed to allocate status page\n");
1671                         return -ENOMEM;
1672                 }
1673
1674                 ret = i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
1675                 if (ret)
1676                         goto err_unref;
1677
1678                 flags = 0;
1679                 if (!HAS_LLC(ring->dev))
1680                         /* On g33, we cannot place HWS above 256MiB, so
1681                          * restrict its pinning to the low mappable arena.
1682                          * Though this restriction is not documented for
1683                          * gen4, gen5, or byt, they also behave similarly
1684                          * and hang if the HWS is placed at the top of the
1685                          * GTT. To generalise, it appears that all !llc
1686                          * platforms have issues with us placing the HWS
1687                          * above the mappable region (even though we never
1688                          * actualy map it).
1689                          */
1690                         flags |= PIN_MAPPABLE;
1691                 ret = i915_gem_obj_ggtt_pin(obj, 4096, flags);
1692                 if (ret) {
1693 err_unref:
1694                         drm_gem_object_unreference(&obj->base);
1695                         return ret;
1696                 }
1697
1698                 ring->status_page.obj = obj;
1699         }
1700
1701         ring->status_page.gfx_addr = i915_gem_obj_ggtt_offset(obj);
1702         ring->status_page.page_addr = kmap(sg_page(obj->pages->sgl));
1703         memset(ring->status_page.page_addr, 0, PAGE_SIZE);
1704
1705         DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
1706                         ring->name, ring->status_page.gfx_addr);
1707
1708         return 0;
1709 }
1710
1711 static int init_phys_status_page(struct intel_engine_cs *ring)
1712 {
1713         struct drm_i915_private *dev_priv = ring->dev->dev_private;
1714
1715         if (!dev_priv->status_page_dmah) {
1716                 dev_priv->status_page_dmah =
1717                         drm_pci_alloc(ring->dev, PAGE_SIZE, PAGE_SIZE);
1718                 if (!dev_priv->status_page_dmah)
1719                         return -ENOMEM;
1720         }
1721
1722         ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
1723         memset(ring->status_page.page_addr, 0, PAGE_SIZE);
1724
1725         return 0;
1726 }
1727
1728 void intel_unpin_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
1729 {
1730         iounmap(ringbuf->virtual_start);
1731         ringbuf->virtual_start = NULL;
1732         i915_gem_object_ggtt_unpin(ringbuf->obj);
1733 }
1734
1735 int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
1736                                      struct intel_ringbuffer *ringbuf)
1737 {
1738         struct drm_i915_private *dev_priv = to_i915(dev);
1739         struct drm_i915_gem_object *obj = ringbuf->obj;
1740         int ret;
1741
1742         ret = i915_gem_obj_ggtt_pin(obj, PAGE_SIZE, PIN_MAPPABLE);
1743         if (ret)
1744                 return ret;
1745
1746         ret = i915_gem_object_set_to_gtt_domain(obj, true);
1747         if (ret) {
1748                 i915_gem_object_ggtt_unpin(obj);
1749                 return ret;
1750         }
1751
1752         ringbuf->virtual_start = ioremap_wc(dev_priv->gtt.mappable_base +
1753                         i915_gem_obj_ggtt_offset(obj), ringbuf->size);
1754         if (ringbuf->virtual_start == NULL) {
1755                 i915_gem_object_ggtt_unpin(obj);
1756                 return -EINVAL;
1757         }
1758
1759         return 0;
1760 }
1761
1762 void intel_destroy_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
1763 {
1764         drm_gem_object_unreference(&ringbuf->obj->base);
1765         ringbuf->obj = NULL;
1766 }
1767
1768 int intel_alloc_ringbuffer_obj(struct drm_device *dev,
1769                                struct intel_ringbuffer *ringbuf)
1770 {
1771         struct drm_i915_gem_object *obj;
1772
1773         obj = NULL;
1774         if (!HAS_LLC(dev))
1775                 obj = i915_gem_object_create_stolen(dev, ringbuf->size);
1776         if (obj == NULL)
1777                 obj = i915_gem_alloc_object(dev, ringbuf->size);
1778         if (obj == NULL)
1779                 return -ENOMEM;
1780
1781         /* mark ring buffers as read-only from GPU side by default */
1782         obj->gt_ro = 1;
1783
1784         ringbuf->obj = obj;
1785
1786         return 0;
1787 }
1788
1789 static int intel_init_ring_buffer(struct drm_device *dev,
1790                                   struct intel_engine_cs *ring)
1791 {
1792         struct intel_ringbuffer *ringbuf = ring->buffer;
1793         int ret;
1794
1795         if (ringbuf == NULL) {
1796                 ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL);
1797                 if (!ringbuf)
1798                         return -ENOMEM;
1799                 ring->buffer = ringbuf;
1800         }
1801
1802         ring->dev = dev;
1803         INIT_LIST_HEAD(&ring->active_list);
1804         INIT_LIST_HEAD(&ring->request_list);
1805         INIT_LIST_HEAD(&ring->execlist_queue);
1806         ringbuf->size = 32 * PAGE_SIZE;
1807         ringbuf->ring = ring;
1808         memset(ring->semaphore.sync_seqno, 0, sizeof(ring->semaphore.sync_seqno));
1809
1810         init_waitqueue_head(&ring->irq_queue);
1811
1812         if (I915_NEED_GFX_HWS(dev)) {
1813                 ret = init_status_page(ring);
1814                 if (ret)
1815                         goto error;
1816         } else {
1817                 BUG_ON(ring->id != RCS);
1818                 ret = init_phys_status_page(ring);
1819                 if (ret)
1820                         goto error;
1821         }
1822
1823         if (ringbuf->obj == NULL) {
1824                 ret = intel_alloc_ringbuffer_obj(dev, ringbuf);
1825                 if (ret) {
1826                         DRM_ERROR("Failed to allocate ringbuffer %s: %d\n",
1827                                         ring->name, ret);
1828                         goto error;
1829                 }
1830
1831                 ret = intel_pin_and_map_ringbuffer_obj(dev, ringbuf);
1832                 if (ret) {
1833                         DRM_ERROR("Failed to pin and map ringbuffer %s: %d\n",
1834                                         ring->name, ret);
1835                         intel_destroy_ringbuffer_obj(ringbuf);
1836                         goto error;
1837                 }
1838         }
1839
1840         /* Workaround an erratum on the i830 which causes a hang if
1841          * the TAIL pointer points to within the last 2 cachelines
1842          * of the buffer.
1843          */
1844         ringbuf->effective_size = ringbuf->size;
1845         if (IS_I830(dev) || IS_845G(dev))
1846                 ringbuf->effective_size -= 2 * CACHELINE_BYTES;
1847
1848         ret = i915_cmd_parser_init_ring(ring);
1849         if (ret)
1850                 goto error;
1851
1852         ret = ring->init(ring);
1853         if (ret)
1854                 goto error;
1855
1856         return 0;
1857
1858 error:
1859         kfree(ringbuf);
1860         ring->buffer = NULL;
1861         return ret;
1862 }
1863
1864 void intel_cleanup_ring_buffer(struct intel_engine_cs *ring)
1865 {
1866         struct drm_i915_private *dev_priv;
1867         struct intel_ringbuffer *ringbuf;
1868
1869         if (!intel_ring_initialized(ring))
1870                 return;
1871
1872         dev_priv = to_i915(ring->dev);
1873         ringbuf = ring->buffer;
1874
1875         intel_stop_ring_buffer(ring);
1876         WARN_ON(!IS_GEN2(ring->dev) && (I915_READ_MODE(ring) & MODE_IDLE) == 0);
1877
1878         intel_unpin_ringbuffer_obj(ringbuf);
1879         intel_destroy_ringbuffer_obj(ringbuf);
1880         ring->preallocated_lazy_request = NULL;
1881         ring->outstanding_lazy_seqno = 0;
1882
1883         if (ring->cleanup)
1884                 ring->cleanup(ring);
1885
1886         cleanup_status_page(ring);
1887
1888         i915_cmd_parser_fini_ring(ring);
1889
1890         kfree(ringbuf);
1891         ring->buffer = NULL;
1892 }
1893
1894 static int intel_ring_wait_request(struct intel_engine_cs *ring, int n)
1895 {
1896         struct intel_ringbuffer *ringbuf = ring->buffer;
1897         struct drm_i915_gem_request *request;
1898         u32 seqno = 0;
1899         int ret;
1900
1901         if (ringbuf->last_retired_head != -1) {
1902                 ringbuf->head = ringbuf->last_retired_head;
1903                 ringbuf->last_retired_head = -1;
1904
1905                 ringbuf->space = intel_ring_space(ringbuf);
1906                 if (ringbuf->space >= n)
1907                         return 0;
1908         }
1909
1910         list_for_each_entry(request, &ring->request_list, list) {
1911                 if (__intel_ring_space(request->tail, ringbuf->tail,
1912                                        ringbuf->size) >= n) {
1913                         seqno = request->seqno;
1914                         break;
1915                 }
1916         }
1917
1918         if (seqno == 0)
1919                 return -ENOSPC;
1920
1921         ret = i915_wait_seqno(ring, seqno);
1922         if (ret)
1923                 return ret;
1924
1925         i915_gem_retire_requests_ring(ring);
1926         ringbuf->head = ringbuf->last_retired_head;
1927         ringbuf->last_retired_head = -1;
1928
1929         ringbuf->space = intel_ring_space(ringbuf);
1930         return 0;
1931 }
1932
1933 static int ring_wait_for_space(struct intel_engine_cs *ring, int n)
1934 {
1935         struct drm_device *dev = ring->dev;
1936         struct drm_i915_private *dev_priv = dev->dev_private;
1937         struct intel_ringbuffer *ringbuf = ring->buffer;
1938         unsigned long end;
1939         int ret;
1940
1941         ret = intel_ring_wait_request(ring, n);
1942         if (ret != -ENOSPC)
1943                 return ret;
1944
1945         /* force the tail write in case we have been skipping them */
1946         __intel_ring_advance(ring);
1947
1948         /* With GEM the hangcheck timer should kick us out of the loop,
1949          * leaving it early runs the risk of corrupting GEM state (due
1950          * to running on almost untested codepaths). But on resume
1951          * timers don't work yet, so prevent a complete hang in that
1952          * case by choosing an insanely large timeout. */
1953         end = jiffies + 60 * HZ;
1954
1955         trace_i915_ring_wait_begin(ring);
1956         do {
1957                 ringbuf->head = I915_READ_HEAD(ring);
1958                 ringbuf->space = intel_ring_space(ringbuf);
1959                 if (ringbuf->space >= n) {
1960                         ret = 0;
1961                         break;
1962                 }
1963
1964                 msleep(1);
1965
1966                 if (dev_priv->mm.interruptible && signal_pending(current)) {
1967                         ret = -ERESTARTSYS;
1968                         break;
1969                 }
1970
1971                 ret = i915_gem_check_wedge(&dev_priv->gpu_error,
1972                                            dev_priv->mm.interruptible);
1973                 if (ret)
1974                         break;
1975
1976                 if (time_after(jiffies, end)) {
1977                         ret = -EBUSY;
1978                         break;
1979                 }
1980         } while (1);
1981         trace_i915_ring_wait_end(ring);
1982         return ret;
1983 }
1984
1985 static int intel_wrap_ring_buffer(struct intel_engine_cs *ring)
1986 {
1987         uint32_t __iomem *virt;
1988         struct intel_ringbuffer *ringbuf = ring->buffer;
1989         int rem = ringbuf->size - ringbuf->tail;
1990
1991         if (ringbuf->space < rem) {
1992                 int ret = ring_wait_for_space(ring, rem);
1993                 if (ret)
1994                         return ret;
1995         }
1996
1997         virt = ringbuf->virtual_start + ringbuf->tail;
1998         rem /= 4;
1999         while (rem--)
2000                 iowrite32(MI_NOOP, virt++);
2001
2002         ringbuf->tail = 0;
2003         ringbuf->space = intel_ring_space(ringbuf);
2004
2005         return 0;
2006 }
2007
2008 int intel_ring_idle(struct intel_engine_cs *ring)
2009 {
2010         u32 seqno;
2011         int ret;
2012
2013         /* We need to add any requests required to flush the objects and ring */
2014         if (ring->outstanding_lazy_seqno) {
2015                 ret = i915_add_request(ring, NULL);
2016                 if (ret)
2017                         return ret;
2018         }
2019
2020         /* Wait upon the last request to be completed */
2021         if (list_empty(&ring->request_list))
2022                 return 0;
2023
2024         seqno = list_entry(ring->request_list.prev,
2025                            struct drm_i915_gem_request,
2026                            list)->seqno;
2027
2028         return i915_wait_seqno(ring, seqno);
2029 }
2030
2031 static int
2032 intel_ring_alloc_seqno(struct intel_engine_cs *ring)
2033 {
2034         if (ring->outstanding_lazy_seqno)
2035                 return 0;
2036
2037         if (ring->preallocated_lazy_request == NULL) {
2038                 struct drm_i915_gem_request *request;
2039
2040                 request = kmalloc(sizeof(*request), GFP_KERNEL);
2041                 if (request == NULL)
2042                         return -ENOMEM;
2043
2044                 ring->preallocated_lazy_request = request;
2045         }
2046
2047         return i915_gem_get_seqno(ring->dev, &ring->outstanding_lazy_seqno);
2048 }
2049
2050 static int __intel_ring_prepare(struct intel_engine_cs *ring,
2051                                 int bytes)
2052 {
2053         struct intel_ringbuffer *ringbuf = ring->buffer;
2054         int ret;
2055
2056         if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) {
2057                 ret = intel_wrap_ring_buffer(ring);
2058                 if (unlikely(ret))
2059                         return ret;
2060         }
2061
2062         if (unlikely(ringbuf->space < bytes)) {
2063                 ret = ring_wait_for_space(ring, bytes);
2064                 if (unlikely(ret))
2065                         return ret;
2066         }
2067
2068         return 0;
2069 }
2070
2071 int intel_ring_begin(struct intel_engine_cs *ring,
2072                      int num_dwords)
2073 {
2074         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2075         int ret;
2076
2077         ret = i915_gem_check_wedge(&dev_priv->gpu_error,
2078                                    dev_priv->mm.interruptible);
2079         if (ret)
2080                 return ret;
2081
2082         ret = __intel_ring_prepare(ring, num_dwords * sizeof(uint32_t));
2083         if (ret)
2084                 return ret;
2085
2086         /* Preallocate the olr before touching the ring */
2087         ret = intel_ring_alloc_seqno(ring);
2088         if (ret)
2089                 return ret;
2090
2091         ring->buffer->space -= num_dwords * sizeof(uint32_t);
2092         return 0;
2093 }
2094
2095 /* Align the ring tail to a cacheline boundary */
2096 int intel_ring_cacheline_align(struct intel_engine_cs *ring)
2097 {
2098         int num_dwords = (ring->buffer->tail & (CACHELINE_BYTES - 1)) / sizeof(uint32_t);
2099         int ret;
2100
2101         if (num_dwords == 0)
2102                 return 0;
2103
2104         num_dwords = CACHELINE_BYTES / sizeof(uint32_t) - num_dwords;
2105         ret = intel_ring_begin(ring, num_dwords);
2106         if (ret)
2107                 return ret;
2108
2109         while (num_dwords--)
2110                 intel_ring_emit(ring, MI_NOOP);
2111
2112         intel_ring_advance(ring);
2113
2114         return 0;
2115 }
2116
2117 void intel_ring_init_seqno(struct intel_engine_cs *ring, u32 seqno)
2118 {
2119         struct drm_device *dev = ring->dev;
2120         struct drm_i915_private *dev_priv = dev->dev_private;
2121
2122         BUG_ON(ring->outstanding_lazy_seqno);
2123
2124         if (INTEL_INFO(dev)->gen == 6 || INTEL_INFO(dev)->gen == 7) {
2125                 I915_WRITE(RING_SYNC_0(ring->mmio_base), 0);
2126                 I915_WRITE(RING_SYNC_1(ring->mmio_base), 0);
2127                 if (HAS_VEBOX(dev))
2128                         I915_WRITE(RING_SYNC_2(ring->mmio_base), 0);
2129         }
2130
2131         ring->set_seqno(ring, seqno);
2132         ring->hangcheck.seqno = seqno;
2133 }
2134
2135 static void gen6_bsd_ring_write_tail(struct intel_engine_cs *ring,
2136                                      u32 value)
2137 {
2138         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2139
2140        /* Every tail move must follow the sequence below */
2141
2142         /* Disable notification that the ring is IDLE. The GT
2143          * will then assume that it is busy and bring it out of rc6.
2144          */
2145         I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
2146                    _MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE));
2147
2148         /* Clear the context id. Here be magic! */
2149         I915_WRITE64(GEN6_BSD_RNCID, 0x0);
2150
2151         /* Wait for the ring not to be idle, i.e. for it to wake up. */
2152         if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
2153                       GEN6_BSD_SLEEP_INDICATOR) == 0,
2154                      50))
2155                 DRM_ERROR("timed out waiting for the BSD ring to wake up\n");
2156
2157         /* Now that the ring is fully powered up, update the tail */
2158         I915_WRITE_TAIL(ring, value);
2159         POSTING_READ(RING_TAIL(ring->mmio_base));
2160
2161         /* Let the ring send IDLE messages to the GT again,
2162          * and so let it sleep to conserve power when idle.
2163          */
2164         I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
2165                    _MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE));
2166 }
2167
2168 static int gen6_bsd_ring_flush(struct intel_engine_cs *ring,
2169                                u32 invalidate, u32 flush)
2170 {
2171         uint32_t cmd;
2172         int ret;
2173
2174         ret = intel_ring_begin(ring, 4);
2175         if (ret)
2176                 return ret;
2177
2178         cmd = MI_FLUSH_DW;
2179         if (INTEL_INFO(ring->dev)->gen >= 8)
2180                 cmd += 1;
2181         /*
2182          * Bspec vol 1c.5 - video engine command streamer:
2183          * "If ENABLED, all TLBs will be invalidated once the flush
2184          * operation is complete. This bit is only valid when the
2185          * Post-Sync Operation field is a value of 1h or 3h."
2186          */
2187         if (invalidate & I915_GEM_GPU_DOMAINS)
2188                 cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD |
2189                         MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
2190         intel_ring_emit(ring, cmd);
2191         intel_ring_emit(ring, I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT);
2192         if (INTEL_INFO(ring->dev)->gen >= 8) {
2193                 intel_ring_emit(ring, 0); /* upper addr */
2194                 intel_ring_emit(ring, 0); /* value */
2195         } else  {
2196                 intel_ring_emit(ring, 0);
2197                 intel_ring_emit(ring, MI_NOOP);
2198         }
2199         intel_ring_advance(ring);
2200         return 0;
2201 }
2202
2203 static int
2204 gen8_ring_dispatch_execbuffer(struct intel_engine_cs *ring,
2205                               u64 offset, u32 len,
2206                               unsigned flags)
2207 {
2208         bool ppgtt = USES_PPGTT(ring->dev) && !(flags & I915_DISPATCH_SECURE);
2209         int ret;
2210
2211         ret = intel_ring_begin(ring, 4);
2212         if (ret)
2213                 return ret;
2214
2215         /* FIXME(BDW): Address space and security selectors. */
2216         intel_ring_emit(ring, MI_BATCH_BUFFER_START_GEN8 | (ppgtt<<8));
2217         intel_ring_emit(ring, lower_32_bits(offset));
2218         intel_ring_emit(ring, upper_32_bits(offset));
2219         intel_ring_emit(ring, MI_NOOP);
2220         intel_ring_advance(ring);
2221
2222         return 0;
2223 }
2224
2225 static int
2226 hsw_ring_dispatch_execbuffer(struct intel_engine_cs *ring,
2227                               u64 offset, u32 len,
2228                               unsigned flags)
2229 {
2230         int ret;
2231
2232         ret = intel_ring_begin(ring, 2);
2233         if (ret)
2234                 return ret;
2235
2236         intel_ring_emit(ring,
2237                         MI_BATCH_BUFFER_START |
2238                         (flags & I915_DISPATCH_SECURE ?
2239                          0 : MI_BATCH_PPGTT_HSW | MI_BATCH_NON_SECURE_HSW));
2240         /* bit0-7 is the length on GEN6+ */
2241         intel_ring_emit(ring, offset);
2242         intel_ring_advance(ring);
2243
2244         return 0;
2245 }
2246
2247 static int
2248 gen6_ring_dispatch_execbuffer(struct intel_engine_cs *ring,
2249                               u64 offset, u32 len,
2250                               unsigned flags)
2251 {
2252         int ret;
2253
2254         ret = intel_ring_begin(ring, 2);
2255         if (ret)
2256                 return ret;
2257
2258         intel_ring_emit(ring,
2259                         MI_BATCH_BUFFER_START |
2260                         (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965));
2261         /* bit0-7 is the length on GEN6+ */
2262         intel_ring_emit(ring, offset);
2263         intel_ring_advance(ring);
2264
2265         return 0;
2266 }
2267
2268 /* Blitter support (SandyBridge+) */
2269
2270 static int gen6_ring_flush(struct intel_engine_cs *ring,
2271                            u32 invalidate, u32 flush)
2272 {
2273         struct drm_device *dev = ring->dev;
2274         struct drm_i915_private *dev_priv = dev->dev_private;
2275         uint32_t cmd;
2276         int ret;
2277
2278         ret = intel_ring_begin(ring, 4);
2279         if (ret)
2280                 return ret;
2281
2282         cmd = MI_FLUSH_DW;
2283         if (INTEL_INFO(ring->dev)->gen >= 8)
2284                 cmd += 1;
2285         /*
2286          * Bspec vol 1c.3 - blitter engine command streamer:
2287          * "If ENABLED, all TLBs will be invalidated once the flush
2288          * operation is complete. This bit is only valid when the
2289          * Post-Sync Operation field is a value of 1h or 3h."
2290          */
2291         if (invalidate & I915_GEM_DOMAIN_RENDER)
2292                 cmd |= MI_INVALIDATE_TLB | MI_FLUSH_DW_STORE_INDEX |
2293                         MI_FLUSH_DW_OP_STOREDW;
2294         intel_ring_emit(ring, cmd);
2295         intel_ring_emit(ring, I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT);
2296         if (INTEL_INFO(ring->dev)->gen >= 8) {
2297                 intel_ring_emit(ring, 0); /* upper addr */
2298                 intel_ring_emit(ring, 0); /* value */
2299         } else  {
2300                 intel_ring_emit(ring, 0);
2301                 intel_ring_emit(ring, MI_NOOP);
2302         }
2303         intel_ring_advance(ring);
2304
2305         if (!invalidate && flush) {
2306                 if (IS_GEN7(dev))
2307                         return gen7_ring_fbc_flush(ring, FBC_REND_CACHE_CLEAN);
2308                 else if (IS_BROADWELL(dev))
2309                         dev_priv->fbc.need_sw_cache_clean = true;
2310         }
2311
2312         return 0;
2313 }
2314
2315 int intel_init_render_ring_buffer(struct drm_device *dev)
2316 {
2317         struct drm_i915_private *dev_priv = dev->dev_private;
2318         struct intel_engine_cs *ring = &dev_priv->ring[RCS];
2319         struct drm_i915_gem_object *obj;
2320         int ret;
2321
2322         ring->name = "render ring";
2323         ring->id = RCS;
2324         ring->mmio_base = RENDER_RING_BASE;
2325
2326         if (INTEL_INFO(dev)->gen >= 8) {
2327                 if (i915_semaphore_is_enabled(dev)) {
2328                         obj = i915_gem_alloc_object(dev, 4096);
2329                         if (obj == NULL) {
2330                                 DRM_ERROR("Failed to allocate semaphore bo. Disabling semaphores\n");
2331                                 i915.semaphores = 0;
2332                         } else {
2333                                 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
2334                                 ret = i915_gem_obj_ggtt_pin(obj, 0, PIN_NONBLOCK);
2335                                 if (ret != 0) {
2336                                         drm_gem_object_unreference(&obj->base);
2337                                         DRM_ERROR("Failed to pin semaphore bo. Disabling semaphores\n");
2338                                         i915.semaphores = 0;
2339                                 } else
2340                                         dev_priv->semaphore_obj = obj;
2341                         }
2342                 }
2343
2344                 ring->init_context = intel_ring_workarounds_emit;
2345                 ring->add_request = gen6_add_request;
2346                 ring->flush = gen8_render_ring_flush;
2347                 ring->irq_get = gen8_ring_get_irq;
2348                 ring->irq_put = gen8_ring_put_irq;
2349                 ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
2350                 ring->get_seqno = gen6_ring_get_seqno;
2351                 ring->set_seqno = ring_set_seqno;
2352                 if (i915_semaphore_is_enabled(dev)) {
2353                         WARN_ON(!dev_priv->semaphore_obj);
2354                         ring->semaphore.sync_to = gen8_ring_sync;
2355                         ring->semaphore.signal = gen8_rcs_signal;
2356                         GEN8_RING_SEMAPHORE_INIT;
2357                 }
2358         } else if (INTEL_INFO(dev)->gen >= 6) {
2359                 ring->add_request = gen6_add_request;
2360                 ring->flush = gen7_render_ring_flush;
2361                 if (INTEL_INFO(dev)->gen == 6)
2362                         ring->flush = gen6_render_ring_flush;
2363                 ring->irq_get = gen6_ring_get_irq;
2364                 ring->irq_put = gen6_ring_put_irq;
2365                 ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
2366                 ring->get_seqno = gen6_ring_get_seqno;
2367                 ring->set_seqno = ring_set_seqno;
2368                 if (i915_semaphore_is_enabled(dev)) {
2369                         ring->semaphore.sync_to = gen6_ring_sync;
2370                         ring->semaphore.signal = gen6_signal;
2371                         /*
2372                          * The current semaphore is only applied on pre-gen8
2373                          * platform.  And there is no VCS2 ring on the pre-gen8
2374                          * platform. So the semaphore between RCS and VCS2 is
2375                          * initialized as INVALID.  Gen8 will initialize the
2376                          * sema between VCS2 and RCS later.
2377                          */
2378                         ring->semaphore.mbox.wait[RCS] = MI_SEMAPHORE_SYNC_INVALID;
2379                         ring->semaphore.mbox.wait[VCS] = MI_SEMAPHORE_SYNC_RV;
2380                         ring->semaphore.mbox.wait[BCS] = MI_SEMAPHORE_SYNC_RB;
2381                         ring->semaphore.mbox.wait[VECS] = MI_SEMAPHORE_SYNC_RVE;
2382                         ring->semaphore.mbox.wait[VCS2] = MI_SEMAPHORE_SYNC_INVALID;
2383                         ring->semaphore.mbox.signal[RCS] = GEN6_NOSYNC;
2384                         ring->semaphore.mbox.signal[VCS] = GEN6_VRSYNC;
2385                         ring->semaphore.mbox.signal[BCS] = GEN6_BRSYNC;
2386                         ring->semaphore.mbox.signal[VECS] = GEN6_VERSYNC;
2387                         ring->semaphore.mbox.signal[VCS2] = GEN6_NOSYNC;
2388                 }
2389         } else if (IS_GEN5(dev)) {
2390                 ring->add_request = pc_render_add_request;
2391                 ring->flush = gen4_render_ring_flush;
2392                 ring->get_seqno = pc_render_get_seqno;
2393                 ring->set_seqno = pc_render_set_seqno;
2394                 ring->irq_get = gen5_ring_get_irq;
2395                 ring->irq_put = gen5_ring_put_irq;
2396                 ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT |
2397                                         GT_RENDER_PIPECTL_NOTIFY_INTERRUPT;
2398         } else {
2399                 ring->add_request = i9xx_add_request;
2400                 if (INTEL_INFO(dev)->gen < 4)
2401                         ring->flush = gen2_render_ring_flush;
2402                 else
2403                         ring->flush = gen4_render_ring_flush;
2404                 ring->get_seqno = ring_get_seqno;
2405                 ring->set_seqno = ring_set_seqno;
2406                 if (IS_GEN2(dev)) {
2407                         ring->irq_get = i8xx_ring_get_irq;
2408                         ring->irq_put = i8xx_ring_put_irq;
2409                 } else {
2410                         ring->irq_get = i9xx_ring_get_irq;
2411                         ring->irq_put = i9xx_ring_put_irq;
2412                 }
2413                 ring->irq_enable_mask = I915_USER_INTERRUPT;
2414         }
2415         ring->write_tail = ring_write_tail;
2416
2417         if (IS_HASWELL(dev))
2418                 ring->dispatch_execbuffer = hsw_ring_dispatch_execbuffer;
2419         else if (IS_GEN8(dev))
2420                 ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
2421         else if (INTEL_INFO(dev)->gen >= 6)
2422                 ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
2423         else if (INTEL_INFO(dev)->gen >= 4)
2424                 ring->dispatch_execbuffer = i965_dispatch_execbuffer;
2425         else if (IS_I830(dev) || IS_845G(dev))
2426                 ring->dispatch_execbuffer = i830_dispatch_execbuffer;
2427         else
2428                 ring->dispatch_execbuffer = i915_dispatch_execbuffer;
2429         ring->init = init_render_ring;
2430         ring->cleanup = render_ring_cleanup;
2431
2432         /* Workaround batchbuffer to combat CS tlb bug. */
2433         if (HAS_BROKEN_CS_TLB(dev)) {
2434                 obj = i915_gem_alloc_object(dev, I830_WA_SIZE);
2435                 if (obj == NULL) {
2436                         DRM_ERROR("Failed to allocate batch bo\n");
2437                         return -ENOMEM;
2438                 }
2439
2440                 ret = i915_gem_obj_ggtt_pin(obj, 0, 0);
2441                 if (ret != 0) {
2442                         drm_gem_object_unreference(&obj->base);
2443                         DRM_ERROR("Failed to ping batch bo\n");
2444                         return ret;
2445                 }
2446
2447                 ring->scratch.obj = obj;
2448                 ring->scratch.gtt_offset = i915_gem_obj_ggtt_offset(obj);
2449         }
2450
2451         return intel_init_ring_buffer(dev, ring);
2452 }
2453
2454 int intel_init_bsd_ring_buffer(struct drm_device *dev)
2455 {
2456         struct drm_i915_private *dev_priv = dev->dev_private;
2457         struct intel_engine_cs *ring = &dev_priv->ring[VCS];
2458
2459         ring->name = "bsd ring";
2460         ring->id = VCS;
2461
2462         ring->write_tail = ring_write_tail;
2463         if (INTEL_INFO(dev)->gen >= 6) {
2464                 ring->mmio_base = GEN6_BSD_RING_BASE;
2465                 /* gen6 bsd needs a special wa for tail updates */
2466                 if (IS_GEN6(dev))
2467                         ring->write_tail = gen6_bsd_ring_write_tail;
2468                 ring->flush = gen6_bsd_ring_flush;
2469                 ring->add_request = gen6_add_request;
2470                 ring->get_seqno = gen6_ring_get_seqno;
2471                 ring->set_seqno = ring_set_seqno;
2472                 if (INTEL_INFO(dev)->gen >= 8) {
2473                         ring->irq_enable_mask =
2474                                 GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
2475                         ring->irq_get = gen8_ring_get_irq;
2476                         ring->irq_put = gen8_ring_put_irq;
2477                         ring->dispatch_execbuffer =
2478                                 gen8_ring_dispatch_execbuffer;
2479                         if (i915_semaphore_is_enabled(dev)) {
2480                                 ring->semaphore.sync_to = gen8_ring_sync;
2481                                 ring->semaphore.signal = gen8_xcs_signal;
2482                                 GEN8_RING_SEMAPHORE_INIT;
2483                         }
2484                 } else {
2485                         ring->irq_enable_mask = GT_BSD_USER_INTERRUPT;
2486                         ring->irq_get = gen6_ring_get_irq;
2487                         ring->irq_put = gen6_ring_put_irq;
2488                         ring->dispatch_execbuffer =
2489                                 gen6_ring_dispatch_execbuffer;
2490                         if (i915_semaphore_is_enabled(dev)) {
2491                                 ring->semaphore.sync_to = gen6_ring_sync;
2492                                 ring->semaphore.signal = gen6_signal;
2493                                 ring->semaphore.mbox.wait[RCS] = MI_SEMAPHORE_SYNC_VR;
2494                                 ring->semaphore.mbox.wait[VCS] = MI_SEMAPHORE_SYNC_INVALID;
2495                                 ring->semaphore.mbox.wait[BCS] = MI_SEMAPHORE_SYNC_VB;
2496                                 ring->semaphore.mbox.wait[VECS] = MI_SEMAPHORE_SYNC_VVE;
2497                                 ring->semaphore.mbox.wait[VCS2] = MI_SEMAPHORE_SYNC_INVALID;
2498                                 ring->semaphore.mbox.signal[RCS] = GEN6_RVSYNC;
2499                                 ring->semaphore.mbox.signal[VCS] = GEN6_NOSYNC;
2500                                 ring->semaphore.mbox.signal[BCS] = GEN6_BVSYNC;
2501                                 ring->semaphore.mbox.signal[VECS] = GEN6_VEVSYNC;
2502                                 ring->semaphore.mbox.signal[VCS2] = GEN6_NOSYNC;
2503                         }
2504                 }
2505         } else {
2506                 ring->mmio_base = BSD_RING_BASE;
2507                 ring->flush = bsd_ring_flush;
2508                 ring->add_request = i9xx_add_request;
2509                 ring->get_seqno = ring_get_seqno;
2510                 ring->set_seqno = ring_set_seqno;
2511                 if (IS_GEN5(dev)) {
2512                         ring->irq_enable_mask = ILK_BSD_USER_INTERRUPT;
2513                         ring->irq_get = gen5_ring_get_irq;
2514                         ring->irq_put = gen5_ring_put_irq;
2515                 } else {
2516                         ring->irq_enable_mask = I915_BSD_USER_INTERRUPT;
2517                         ring->irq_get = i9xx_ring_get_irq;
2518                         ring->irq_put = i9xx_ring_put_irq;
2519                 }
2520                 ring->dispatch_execbuffer = i965_dispatch_execbuffer;
2521         }
2522         ring->init = init_ring_common;
2523
2524         return intel_init_ring_buffer(dev, ring);
2525 }
2526
2527 /**
2528  * Initialize the second BSD ring for Broadwell GT3.
2529  * It is noted that this only exists on Broadwell GT3.
2530  */
2531 int intel_init_bsd2_ring_buffer(struct drm_device *dev)
2532 {
2533         struct drm_i915_private *dev_priv = dev->dev_private;
2534         struct intel_engine_cs *ring = &dev_priv->ring[VCS2];
2535
2536         if ((INTEL_INFO(dev)->gen != 8)) {
2537                 DRM_ERROR("No dual-BSD ring on non-BDW machine\n");
2538                 return -EINVAL;
2539         }
2540
2541         ring->name = "bsd2 ring";
2542         ring->id = VCS2;
2543
2544         ring->write_tail = ring_write_tail;
2545         ring->mmio_base = GEN8_BSD2_RING_BASE;
2546         ring->flush = gen6_bsd_ring_flush;
2547         ring->add_request = gen6_add_request;
2548         ring->get_seqno = gen6_ring_get_seqno;
2549         ring->set_seqno = ring_set_seqno;
2550         ring->irq_enable_mask =
2551                         GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
2552         ring->irq_get = gen8_ring_get_irq;
2553         ring->irq_put = gen8_ring_put_irq;
2554         ring->dispatch_execbuffer =
2555                         gen8_ring_dispatch_execbuffer;
2556         if (i915_semaphore_is_enabled(dev)) {
2557                 ring->semaphore.sync_to = gen8_ring_sync;
2558                 ring->semaphore.signal = gen8_xcs_signal;
2559                 GEN8_RING_SEMAPHORE_INIT;
2560         }
2561         ring->init = init_ring_common;
2562
2563         return intel_init_ring_buffer(dev, ring);
2564 }
2565
2566 int intel_init_blt_ring_buffer(struct drm_device *dev)
2567 {
2568         struct drm_i915_private *dev_priv = dev->dev_private;
2569         struct intel_engine_cs *ring = &dev_priv->ring[BCS];
2570
2571         ring->name = "blitter ring";
2572         ring->id = BCS;
2573
2574         ring->mmio_base = BLT_RING_BASE;
2575         ring->write_tail = ring_write_tail;
2576         ring->flush = gen6_ring_flush;
2577         ring->add_request = gen6_add_request;
2578         ring->get_seqno = gen6_ring_get_seqno;
2579         ring->set_seqno = ring_set_seqno;
2580         if (INTEL_INFO(dev)->gen >= 8) {
2581                 ring->irq_enable_mask =
2582                         GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
2583                 ring->irq_get = gen8_ring_get_irq;
2584                 ring->irq_put = gen8_ring_put_irq;
2585                 ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
2586                 if (i915_semaphore_is_enabled(dev)) {
2587                         ring->semaphore.sync_to = gen8_ring_sync;
2588                         ring->semaphore.signal = gen8_xcs_signal;
2589                         GEN8_RING_SEMAPHORE_INIT;
2590                 }
2591         } else {
2592                 ring->irq_enable_mask = GT_BLT_USER_INTERRUPT;
2593                 ring->irq_get = gen6_ring_get_irq;
2594                 ring->irq_put = gen6_ring_put_irq;
2595                 ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
2596                 if (i915_semaphore_is_enabled(dev)) {
2597                         ring->semaphore.signal = gen6_signal;
2598                         ring->semaphore.sync_to = gen6_ring_sync;
2599                         /*
2600                          * The current semaphore is only applied on pre-gen8
2601                          * platform.  And there is no VCS2 ring on the pre-gen8
2602                          * platform. So the semaphore between BCS and VCS2 is
2603                          * initialized as INVALID.  Gen8 will initialize the
2604                          * sema between BCS and VCS2 later.
2605                          */
2606                         ring->semaphore.mbox.wait[RCS] = MI_SEMAPHORE_SYNC_BR;
2607                         ring->semaphore.mbox.wait[VCS] = MI_SEMAPHORE_SYNC_BV;
2608                         ring->semaphore.mbox.wait[BCS] = MI_SEMAPHORE_SYNC_INVALID;
2609                         ring->semaphore.mbox.wait[VECS] = MI_SEMAPHORE_SYNC_BVE;
2610                         ring->semaphore.mbox.wait[VCS2] = MI_SEMAPHORE_SYNC_INVALID;
2611                         ring->semaphore.mbox.signal[RCS] = GEN6_RBSYNC;
2612                         ring->semaphore.mbox.signal[VCS] = GEN6_VBSYNC;
2613                         ring->semaphore.mbox.signal[BCS] = GEN6_NOSYNC;
2614                         ring->semaphore.mbox.signal[VECS] = GEN6_VEBSYNC;
2615                         ring->semaphore.mbox.signal[VCS2] = GEN6_NOSYNC;
2616                 }
2617         }
2618         ring->init = init_ring_common;
2619
2620         return intel_init_ring_buffer(dev, ring);
2621 }
2622
2623 int intel_init_vebox_ring_buffer(struct drm_device *dev)
2624 {
2625         struct drm_i915_private *dev_priv = dev->dev_private;
2626         struct intel_engine_cs *ring = &dev_priv->ring[VECS];
2627
2628         ring->name = "video enhancement ring";
2629         ring->id = VECS;
2630
2631         ring->mmio_base = VEBOX_RING_BASE;
2632         ring->write_tail = ring_write_tail;
2633         ring->flush = gen6_ring_flush;
2634         ring->add_request = gen6_add_request;
2635         ring->get_seqno = gen6_ring_get_seqno;
2636         ring->set_seqno = ring_set_seqno;
2637
2638         if (INTEL_INFO(dev)->gen >= 8) {
2639                 ring->irq_enable_mask =
2640                         GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
2641                 ring->irq_get = gen8_ring_get_irq;
2642                 ring->irq_put = gen8_ring_put_irq;
2643                 ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
2644                 if (i915_semaphore_is_enabled(dev)) {
2645                         ring->semaphore.sync_to = gen8_ring_sync;
2646                         ring->semaphore.signal = gen8_xcs_signal;
2647                         GEN8_RING_SEMAPHORE_INIT;
2648                 }
2649         } else {
2650                 ring->irq_enable_mask = PM_VEBOX_USER_INTERRUPT;
2651                 ring->irq_get = hsw_vebox_get_irq;
2652                 ring->irq_put = hsw_vebox_put_irq;
2653                 ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
2654                 if (i915_semaphore_is_enabled(dev)) {
2655                         ring->semaphore.sync_to = gen6_ring_sync;
2656                         ring->semaphore.signal = gen6_signal;
2657                         ring->semaphore.mbox.wait[RCS] = MI_SEMAPHORE_SYNC_VER;
2658                         ring->semaphore.mbox.wait[VCS] = MI_SEMAPHORE_SYNC_VEV;
2659                         ring->semaphore.mbox.wait[BCS] = MI_SEMAPHORE_SYNC_VEB;
2660                         ring->semaphore.mbox.wait[VECS] = MI_SEMAPHORE_SYNC_INVALID;
2661                         ring->semaphore.mbox.wait[VCS2] = MI_SEMAPHORE_SYNC_INVALID;
2662                         ring->semaphore.mbox.signal[RCS] = GEN6_RVESYNC;
2663                         ring->semaphore.mbox.signal[VCS] = GEN6_VVESYNC;
2664                         ring->semaphore.mbox.signal[BCS] = GEN6_BVESYNC;
2665                         ring->semaphore.mbox.signal[VECS] = GEN6_NOSYNC;
2666                         ring->semaphore.mbox.signal[VCS2] = GEN6_NOSYNC;
2667                 }
2668         }
2669         ring->init = init_ring_common;
2670
2671         return intel_init_ring_buffer(dev, ring);
2672 }
2673
2674 int
2675 intel_ring_flush_all_caches(struct intel_engine_cs *ring)
2676 {
2677         int ret;
2678
2679         if (!ring->gpu_caches_dirty)
2680                 return 0;
2681
2682         ret = ring->flush(ring, 0, I915_GEM_GPU_DOMAINS);
2683         if (ret)
2684                 return ret;
2685
2686         trace_i915_gem_ring_flush(ring, 0, I915_GEM_GPU_DOMAINS);
2687
2688         ring->gpu_caches_dirty = false;
2689         return 0;
2690 }
2691
2692 int
2693 intel_ring_invalidate_all_caches(struct intel_engine_cs *ring)
2694 {
2695         uint32_t flush_domains;
2696         int ret;
2697
2698         flush_domains = 0;
2699         if (ring->gpu_caches_dirty)
2700                 flush_domains = I915_GEM_GPU_DOMAINS;
2701
2702         ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, flush_domains);
2703         if (ret)
2704                 return ret;
2705
2706         trace_i915_gem_ring_flush(ring, I915_GEM_GPU_DOMAINS, flush_domains);
2707
2708         ring->gpu_caches_dirty = false;
2709         return 0;
2710 }
2711
2712 void
2713 intel_stop_ring_buffer(struct intel_engine_cs *ring)
2714 {
2715         int ret;
2716
2717         if (!intel_ring_initialized(ring))
2718                 return;
2719
2720         ret = intel_ring_idle(ring);
2721         if (ret && !i915_reset_in_progress(&to_i915(ring->dev)->gpu_error))
2722                 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
2723                           ring->name, ret);
2724
2725         stop_ring(ring);
2726 }