drivers/gpu/drm/i915/intel_engine_cs.c

   1 /*
   2  * Copyright © 2016 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  */
  24
  25 #include "i915_drv.h"
  26 #include "intel_ringbuffer.h"
  27 #include "intel_lrc.h"
  28
  29 /* Haswell does have the CXT_SIZE register however it does not appear to be
  30  * valid. Now, docs explain in dwords what is in the context object. The full
  31  * size is 70720 bytes, however, the power context and execlist context will
  32  * never be saved (power context is stored elsewhere, and execlists don't work
  33  * on HSW) - so the final size, including the extra state required for the
  34  * Resource Streamer, is 66944 bytes, which rounds to 17 pages.
  35  */
  36 #define HSW_CXT_TOTAL_SIZE              (17 * PAGE_SIZE)
  37 /* Same as Haswell, but 72064 bytes now. */
  38 #define GEN8_CXT_TOTAL_SIZE             (18 * PAGE_SIZE)
  39
  40 #define GEN8_LR_CONTEXT_RENDER_SIZE     (20 * PAGE_SIZE)
  41 #define GEN9_LR_CONTEXT_RENDER_SIZE     (22 * PAGE_SIZE)
  42
  43 #define GEN8_LR_CONTEXT_OTHER_SIZE      ( 2 * PAGE_SIZE)
  44
  45 struct engine_class_info {
  46         const char *name;
  47         int (*init_legacy)(struct intel_engine_cs *engine);
  48         int (*init_execlists)(struct intel_engine_cs *engine);
  49 };
  50
  51 static const struct engine_class_info intel_engine_classes[] = {
  52         [RENDER_CLASS] = {
  53                 .name = "rcs",
  54                 .init_execlists = logical_render_ring_init,
  55                 .init_legacy = intel_init_render_ring_buffer,
  56         },
  57         [COPY_ENGINE_CLASS] = {
  58                 .name = "bcs",
  59                 .init_execlists = logical_xcs_ring_init,
  60                 .init_legacy = intel_init_blt_ring_buffer,
  61         },
  62         [VIDEO_DECODE_CLASS] = {
  63                 .name = "vcs",
  64                 .init_execlists = logical_xcs_ring_init,
  65                 .init_legacy = intel_init_bsd_ring_buffer,
  66         },
  67         [VIDEO_ENHANCEMENT_CLASS] = {
  68                 .name = "vecs",
  69                 .init_execlists = logical_xcs_ring_init,
  70                 .init_legacy = intel_init_vebox_ring_buffer,
  71         },
  72 };
  73
  74 struct engine_info {
  75         unsigned int hw_id;
  76         unsigned int uabi_id;
  77         u8 class;
  78         u8 instance;
  79         u32 mmio_base;
  80         unsigned irq_shift;
  81 };
  82
  83 static const struct engine_info intel_engines[] = {
  84         [RCS] = {
  85                 .hw_id = RCS_HW,
  86                 .uabi_id = I915_EXEC_RENDER,
  87                 .class = RENDER_CLASS,
  88                 .instance = 0,
  89                 .mmio_base = RENDER_RING_BASE,
  90                 .irq_shift = GEN8_RCS_IRQ_SHIFT,
  91         },
  92         [BCS] = {
  93                 .hw_id = BCS_HW,
  94                 .uabi_id = I915_EXEC_BLT,
  95                 .class = COPY_ENGINE_CLASS,
  96                 .instance = 0,
  97                 .mmio_base = BLT_RING_BASE,
  98                 .irq_shift = GEN8_BCS_IRQ_SHIFT,
  99         },
 100         [VCS] = {
 101                 .hw_id = VCS_HW,
 102                 .uabi_id = I915_EXEC_BSD,
 103                 .class = VIDEO_DECODE_CLASS,
 104                 .instance = 0,
 105                 .mmio_base = GEN6_BSD_RING_BASE,
 106                 .irq_shift = GEN8_VCS1_IRQ_SHIFT,
 107         },
 108         [VCS2] = {
 109                 .hw_id = VCS2_HW,
 110                 .uabi_id = I915_EXEC_BSD,
 111                 .class = VIDEO_DECODE_CLASS,
 112                 .instance = 1,
 113                 .mmio_base = GEN8_BSD2_RING_BASE,
 114                 .irq_shift = GEN8_VCS2_IRQ_SHIFT,
 115         },
 116         [VECS] = {
 117                 .hw_id = VECS_HW,
 118                 .uabi_id = I915_EXEC_VEBOX,
 119                 .class = VIDEO_ENHANCEMENT_CLASS,
 120                 .instance = 0,
 121                 .mmio_base = VEBOX_RING_BASE,
 122                 .irq_shift = GEN8_VECS_IRQ_SHIFT,
 123         },
 124 };
 125
 126 /**
 127  * ___intel_engine_context_size() - return the size of the context for an engine
 128  * @dev_priv: i915 device private
 129  * @class: engine class
 130  *
 131  * Each engine class may require a different amount of space for a context
 132  * image.
 133  *
 134  * Return: size (in bytes) of an engine class specific context image
 135  *
 136  * Note: this size includes the HWSP, which is part of the context image
 137  * in LRC mode, but does not include the "shared data page" used with
 138  * GuC submission. The caller should account for this if using the GuC.
 139  */
 140 static u32
 141 __intel_engine_context_size(struct drm_i915_private *dev_priv, u8 class)
 142 {
 143         u32 cxt_size;
 144
 145         BUILD_BUG_ON(I915_GTT_PAGE_SIZE != PAGE_SIZE);
 146
 147         switch (class) {
 148         case RENDER_CLASS:
 149                 switch (INTEL_GEN(dev_priv)) {
 150                 default:
 151                         MISSING_CASE(INTEL_GEN(dev_priv));
 152                 case 10:
 153                 case 9:
 154                         return GEN9_LR_CONTEXT_RENDER_SIZE;
 155                 case 8:
 156                         return i915.enable_execlists ?
 157                                GEN8_LR_CONTEXT_RENDER_SIZE :
 158                                GEN8_CXT_TOTAL_SIZE;
 159                 case 7:
 160                         if (IS_HASWELL(dev_priv))
 161                                 return HSW_CXT_TOTAL_SIZE;
 162
 163                         cxt_size = I915_READ(GEN7_CXT_SIZE);
 164                         return round_up(GEN7_CXT_TOTAL_SIZE(cxt_size) * 64,
 165                                         PAGE_SIZE);
 166                 case 6:
 167                         cxt_size = I915_READ(CXT_SIZE);
 168                         return round_up(GEN6_CXT_TOTAL_SIZE(cxt_size) * 64,
 169                                         PAGE_SIZE);
 170                 case 5:
 171                 case 4:
 172                 case 3:
 173                 case 2:
 174                 /* For the special day when i810 gets merged. */
 175                 case 1:
 176                         return 0;
 177                 }
 178                 break;
 179         default:
 180                 MISSING_CASE(class);
 181         case VIDEO_DECODE_CLASS:
 182         case VIDEO_ENHANCEMENT_CLASS:
 183         case COPY_ENGINE_CLASS:
 184                 if (INTEL_GEN(dev_priv) < 8)
 185                         return 0;
 186                 return GEN8_LR_CONTEXT_OTHER_SIZE;
 187         }
 188 }
 189
 190 static int
 191 intel_engine_setup(struct drm_i915_private *dev_priv,
 192                    enum intel_engine_id id)
 193 {
 194         const struct engine_info *info = &intel_engines[id];
 195         const struct engine_class_info *class_info;
 196         struct intel_engine_cs *engine;
 197
 198         GEM_BUG_ON(info->class >= ARRAY_SIZE(intel_engine_classes));
 199         class_info = &intel_engine_classes[info->class];
 200
 201         GEM_BUG_ON(dev_priv->engine[id]);
 202         engine = kzalloc(sizeof(*engine), GFP_KERNEL);
 203         if (!engine)
 204                 return -ENOMEM;
 205
 206         engine->id = id;
 207         engine->i915 = dev_priv;
 208         WARN_ON(snprintf(engine->name, sizeof(engine->name), "%s%u",
 209                          class_info->name, info->instance) >=
 210                 sizeof(engine->name));
 211         engine->uabi_id = info->uabi_id;
 212         engine->hw_id = engine->guc_id = info->hw_id;
 213         engine->mmio_base = info->mmio_base;
 214         engine->irq_shift = info->irq_shift;
 215         engine->class = info->class;
 216         engine->instance = info->instance;
 217
 218         engine->context_size = __intel_engine_context_size(dev_priv,
 219                                                            engine->class);
 220         if (WARN_ON(engine->context_size > BIT(20)))
 221                 engine->context_size = 0;
 222
 223         /* Nothing to do here, execute in order of dependencies */
 224         engine->schedule = NULL;
 225
 226         ATOMIC_INIT_NOTIFIER_HEAD(&engine->context_status_notifier);
 227
 228         dev_priv->engine[id] = engine;
 229         return 0;
 230 }
 231
 232 /**
 233  * intel_engines_init_mmio() - allocate and prepare the Engine Command Streamers
 234  * @dev_priv: i915 device private
 235  *
 236  * Return: non-zero if the initialization failed.
 237  */
 238 int intel_engines_init_mmio(struct drm_i915_private *dev_priv)
 239 {
 240         struct intel_device_info *device_info = mkwrite_device_info(dev_priv);
 241         const unsigned int ring_mask = INTEL_INFO(dev_priv)->ring_mask;
 242         struct intel_engine_cs *engine;
 243         enum intel_engine_id id;
 244         unsigned int mask = 0;
 245         unsigned int i;
 246         int err;
 247
 248         WARN_ON(ring_mask == 0);
 249         WARN_ON(ring_mask &
 250                 GENMASK(sizeof(mask) * BITS_PER_BYTE - 1, I915_NUM_ENGINES));
 251
 252         for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
 253                 if (!HAS_ENGINE(dev_priv, i))
 254                         continue;
 255
 256                 err = intel_engine_setup(dev_priv, i);
 257                 if (err)
 258                         goto cleanup;
 259
 260                 mask |= ENGINE_MASK(i);
 261         }
 262
 263         /*
 264          * Catch failures to update intel_engines table when the new engines
 265          * are added to the driver by a warning and disabling the forgotten
 266          * engines.
 267          */
 268         if (WARN_ON(mask != ring_mask))
 269                 device_info->ring_mask = mask;
 270
 271         /* We always presume we have at least RCS available for later probing */
 272         if (WARN_ON(!HAS_ENGINE(dev_priv, RCS))) {
 273                 err = -ENODEV;
 274                 goto cleanup;
 275         }
 276
 277         device_info->num_rings = hweight32(mask);
 278
 279         return 0;
 280
 281 cleanup:
 282         for_each_engine(engine, dev_priv, id)
 283                 kfree(engine);
 284         return err;
 285 }
 286
 287 /**
 288  * intel_engines_init() - init the Engine Command Streamers
 289  * @dev_priv: i915 device private
 290  *
 291  * Return: non-zero if the initialization failed.
 292  */
 293 int intel_engines_init(struct drm_i915_private *dev_priv)
 294 {
 295         struct intel_engine_cs *engine;
 296         enum intel_engine_id id, err_id;
 297         int err;
 298
 299         for_each_engine(engine, dev_priv, id) {
 300                 const struct engine_class_info *class_info =
 301                         &intel_engine_classes[engine->class];
 302                 int (*init)(struct intel_engine_cs *engine);
 303
 304                 if (i915.enable_execlists)
 305                         init = class_info->init_execlists;
 306                 else
 307                         init = class_info->init_legacy;
 308
 309                 err = -EINVAL;
 310                 err_id = id;
 311
 312                 if (GEM_WARN_ON(!init))
 313                         goto cleanup;
 314
 315                 err = init(engine);
 316                 if (err)
 317                         goto cleanup;
 318
 319                 GEM_BUG_ON(!engine->submit_request);
 320         }
 321
 322         return 0;
 323
 324 cleanup:
 325         for_each_engine(engine, dev_priv, id) {
 326                 if (id >= err_id) {
 327                         kfree(engine);
 328                         dev_priv->engine[id] = NULL;
 329                 } else {
 330                         dev_priv->gt.cleanup_engine(engine);
 331                 }
 332         }
 333         return err;
 334 }
 335
 336 void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno)
 337 {
 338         struct drm_i915_private *dev_priv = engine->i915;
 339
 340         /* Our semaphore implementation is strictly monotonic (i.e. we proceed
 341          * so long as the semaphore value in the register/page is greater
 342          * than the sync value), so whenever we reset the seqno,
 343          * so long as we reset the tracking semaphore value to 0, it will
 344          * always be before the next request's seqno. If we don't reset
 345          * the semaphore value, then when the seqno moves backwards all
 346          * future waits will complete instantly (causing rendering corruption).
 347          */
 348         if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
 349                 I915_WRITE(RING_SYNC_0(engine->mmio_base), 0);
 350                 I915_WRITE(RING_SYNC_1(engine->mmio_base), 0);
 351                 if (HAS_VEBOX(dev_priv))
 352                         I915_WRITE(RING_SYNC_2(engine->mmio_base), 0);
 353         }
 354         if (dev_priv->semaphore) {
 355                 struct page *page = i915_vma_first_page(dev_priv->semaphore);
 356                 void *semaphores;
 357
 358                 /* Semaphores are in noncoherent memory, flush to be safe */
 359                 semaphores = kmap_atomic(page);
 360                 memset(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
 361                        0, I915_NUM_ENGINES * gen8_semaphore_seqno_size);
 362                 drm_clflush_virt_range(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
 363                                        I915_NUM_ENGINES * gen8_semaphore_seqno_size);
 364                 kunmap_atomic(semaphores);
 365         }
 366
 367         intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
 368         clear_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted);
 369
 370         /* After manually advancing the seqno, fake the interrupt in case
 371          * there are any waiters for that seqno.
 372          */
 373         intel_engine_wakeup(engine);
 374
 375         GEM_BUG_ON(intel_engine_get_seqno(engine) != seqno);
 376 }
 377
 378 static void intel_engine_init_timeline(struct intel_engine_cs *engine)
 379 {
 380         engine->timeline = &engine->i915->gt.global_timeline.engine[engine->id];
 381 }
 382
 383 /**
 384  * intel_engines_setup_common - setup engine state not requiring hw access
 385  * @engine: Engine to setup.
 386  *
 387  * Initializes @engine@ structure members shared between legacy and execlists
 388  * submission modes which do not require hardware access.
 389  *
 390  * Typically done early in the submission mode specific engine setup stage.
 391  */
 392 void intel_engine_setup_common(struct intel_engine_cs *engine)
 393 {
 394         engine->execlist_queue = RB_ROOT;
 395         engine->execlist_first = NULL;
 396
 397         intel_engine_init_timeline(engine);
 398         intel_engine_init_hangcheck(engine);
 399         i915_gem_batch_pool_init(engine, &engine->batch_pool);
 400
 401         intel_engine_init_cmd_parser(engine);
 402 }
 403
 404 int intel_engine_create_scratch(struct intel_engine_cs *engine, int size)
 405 {
 406         struct drm_i915_gem_object *obj;
 407         struct i915_vma *vma;
 408         int ret;
 409
 410         WARN_ON(engine->scratch);
 411
 412         obj = i915_gem_object_create_stolen(engine->i915, size);
 413         if (!obj)
 414                 obj = i915_gem_object_create_internal(engine->i915, size);
 415         if (IS_ERR(obj)) {
 416                 DRM_ERROR("Failed to allocate scratch page\n");
 417                 return PTR_ERR(obj);
 418         }
 419
 420         vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
 421         if (IS_ERR(vma)) {
 422                 ret = PTR_ERR(vma);
 423                 goto err_unref;
 424         }
 425
 426         ret = i915_vma_pin(vma, 0, 4096, PIN_GLOBAL | PIN_HIGH);
 427         if (ret)
 428                 goto err_unref;
 429
 430         engine->scratch = vma;
 431         DRM_DEBUG_DRIVER("%s pipe control offset: 0x%08x\n",
 432                          engine->name, i915_ggtt_offset(vma));
 433         return 0;
 434
 435 err_unref:
 436         i915_gem_object_put(obj);
 437         return ret;
 438 }
 439
 440 static void intel_engine_cleanup_scratch(struct intel_engine_cs *engine)
 441 {
 442         i915_vma_unpin_and_release(&engine->scratch);
 443 }
 444
 445 /**
 446  * intel_engines_init_common - initialize cengine state which might require hw access
 447  * @engine: Engine to initialize.
 448  *
 449  * Initializes @engine@ structure members shared between legacy and execlists
 450  * submission modes which do require hardware access.
 451  *
 452  * Typcally done at later stages of submission mode specific engine setup.
 453  *
 454  * Returns zero on success or an error code on failure.
 455  */
 456 int intel_engine_init_common(struct intel_engine_cs *engine)
 457 {
 458         struct intel_ring *ring;
 459         int ret;
 460
 461         engine->set_default_submission(engine);
 462
 463         /* We may need to do things with the shrinker which
 464          * require us to immediately switch back to the default
 465          * context. This can cause a problem as pinning the
 466          * default context also requires GTT space which may not
 467          * be available. To avoid this we always pin the default
 468          * context.
 469          */
 470         ring = engine->context_pin(engine, engine->i915->kernel_context);
 471         if (IS_ERR(ring))
 472                 return PTR_ERR(ring);
 473
 474         ret = intel_engine_init_breadcrumbs(engine);
 475         if (ret)
 476                 goto err_unpin;
 477
 478         ret = i915_gem_render_state_init(engine);
 479         if (ret)
 480                 goto err_unpin;
 481
 482         return 0;
 483
 484 err_unpin:
 485         engine->context_unpin(engine, engine->i915->kernel_context);
 486         return ret;
 487 }
 488
 489 /**
 490  * intel_engines_cleanup_common - cleans up the engine state created by
 491  *                                the common initiailizers.
 492  * @engine: Engine to cleanup.
 493  *
 494  * This cleans up everything created by the common helpers.
 495  */
 496 void intel_engine_cleanup_common(struct intel_engine_cs *engine)
 497 {
 498         intel_engine_cleanup_scratch(engine);
 499
 500         i915_gem_render_state_fini(engine);
 501         intel_engine_fini_breadcrumbs(engine);
 502         intel_engine_cleanup_cmd_parser(engine);
 503         i915_gem_batch_pool_fini(&engine->batch_pool);
 504
 505         engine->context_unpin(engine, engine->i915->kernel_context);
 506 }
 507
 508 u64 intel_engine_get_active_head(struct intel_engine_cs *engine)
 509 {
 510         struct drm_i915_private *dev_priv = engine->i915;
 511         u64 acthd;
 512
 513         if (INTEL_GEN(dev_priv) >= 8)
 514                 acthd = I915_READ64_2x32(RING_ACTHD(engine->mmio_base),
 515                                          RING_ACTHD_UDW(engine->mmio_base));
 516         else if (INTEL_GEN(dev_priv) >= 4)
 517                 acthd = I915_READ(RING_ACTHD(engine->mmio_base));
 518         else
 519                 acthd = I915_READ(ACTHD);
 520
 521         return acthd;
 522 }
 523
 524 u64 intel_engine_get_last_batch_head(struct intel_engine_cs *engine)
 525 {
 526         struct drm_i915_private *dev_priv = engine->i915;
 527         u64 bbaddr;
 528
 529         if (INTEL_GEN(dev_priv) >= 8)
 530                 bbaddr = I915_READ64_2x32(RING_BBADDR(engine->mmio_base),
 531                                           RING_BBADDR_UDW(engine->mmio_base));
 532         else
 533                 bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));
 534
 535         return bbaddr;
 536 }
 537
 538 const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
 539 {
 540         switch (type) {
 541         case I915_CACHE_NONE: return " uncached";
 542         case I915_CACHE_LLC: return HAS_LLC(i915) ? " LLC" : " snooped";
 543         case I915_CACHE_L3_LLC: return " L3+LLC";
 544         case I915_CACHE_WT: return " WT";
 545         default: return "";
 546         }
 547 }
 548
 549 static inline uint32_t
 550 read_subslice_reg(struct drm_i915_private *dev_priv, int slice,
 551                   int subslice, i915_reg_t reg)
 552 {
 553         uint32_t mcr;
 554         uint32_t ret;
 555         enum forcewake_domains fw_domains;
 556
 557         fw_domains = intel_uncore_forcewake_for_reg(dev_priv, reg,
 558                                                     FW_REG_READ);
 559         fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
 560                                                      GEN8_MCR_SELECTOR,
 561                                                      FW_REG_READ | FW_REG_WRITE);
 562
 563         spin_lock_irq(&dev_priv->uncore.lock);
 564         intel_uncore_forcewake_get__locked(dev_priv, fw_domains);
 565
 566         mcr = I915_READ_FW(GEN8_MCR_SELECTOR);
 567         /*
 568          * The HW expects the slice and sublice selectors to be reset to 0
 569          * after reading out the registers.
 570          */
 571         WARN_ON_ONCE(mcr & (GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK));
 572         mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
 573         mcr |= GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);
 574         I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);
 575
 576         ret = I915_READ_FW(reg);
 577
 578         mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
 579         I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);
 580
 581         intel_uncore_forcewake_put__locked(dev_priv, fw_domains);
 582         spin_unlock_irq(&dev_priv->uncore.lock);
 583
 584         return ret;
 585 }
 586
 587 /* NB: please notice the memset */
 588 void intel_engine_get_instdone(struct intel_engine_cs *engine,
 589                                struct intel_instdone *instdone)
 590 {
 591         struct drm_i915_private *dev_priv = engine->i915;
 592         u32 mmio_base = engine->mmio_base;
 593         int slice;
 594         int subslice;
 595
 596         memset(instdone, 0, sizeof(*instdone));
 597
 598         switch (INTEL_GEN(dev_priv)) {
 599         default:
 600                 instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
 601
 602                 if (engine->id != RCS)
 603                         break;
 604
 605                 instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
 606                 for_each_instdone_slice_subslice(dev_priv, slice, subslice) {
 607                         instdone->sampler[slice][subslice] =
 608                                 read_subslice_reg(dev_priv, slice, subslice,
 609                                                   GEN7_SAMPLER_INSTDONE);
 610                         instdone->row[slice][subslice] =
 611                                 read_subslice_reg(dev_priv, slice, subslice,
 612                                                   GEN7_ROW_INSTDONE);
 613                 }
 614                 break;
 615         case 7:
 616                 instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
 617
 618                 if (engine->id != RCS)
 619                         break;
 620
 621                 instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
 622                 instdone->sampler[0][0] = I915_READ(GEN7_SAMPLER_INSTDONE);
 623                 instdone->row[0][0] = I915_READ(GEN7_ROW_INSTDONE);
 624
 625                 break;
 626         case 6:
 627         case 5:
 628         case 4:
 629                 instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
 630
 631                 if (engine->id == RCS)
 632                         /* HACK: Using the wrong struct member */
 633                         instdone->slice_common = I915_READ(GEN4_INSTDONE1);
 634                 break;
 635         case 3:
 636         case 2:
 637                 instdone->instdone = I915_READ(GEN2_INSTDONE);
 638                 break;
 639         }
 640 }
 641
 642 static int wa_add(struct drm_i915_private *dev_priv,
 643                   i915_reg_t addr,
 644                   const u32 mask, const u32 val)
 645 {
 646         const u32 idx = dev_priv->workarounds.count;
 647
 648         if (WARN_ON(idx >= I915_MAX_WA_REGS))
 649                 return -ENOSPC;
 650
 651         dev_priv->workarounds.reg[idx].addr = addr;
 652         dev_priv->workarounds.reg[idx].value = val;
 653         dev_priv->workarounds.reg[idx].mask = mask;
 654
 655         dev_priv->workarounds.count++;
 656
 657         return 0;
 658 }
 659
 660 #define WA_REG(addr, mask, val) do { \
 661                 const int r = wa_add(dev_priv, (addr), (mask), (val)); \
 662                 if (r) \
 663                         return r; \
 664         } while (0)
 665
 666 #define WA_SET_BIT_MASKED(addr, mask) \
 667         WA_REG(addr, (mask), _MASKED_BIT_ENABLE(mask))
 668
 669 #define WA_CLR_BIT_MASKED(addr, mask) \
 670         WA_REG(addr, (mask), _MASKED_BIT_DISABLE(mask))
 671
 672 #define WA_SET_FIELD_MASKED(addr, mask, value) \
 673         WA_REG(addr, mask, _MASKED_FIELD(mask, value))
 674
 675 #define WA_SET_BIT(addr, mask) WA_REG(addr, mask, I915_READ(addr) | (mask))
 676 #define WA_CLR_BIT(addr, mask) WA_REG(addr, mask, I915_READ(addr) & ~(mask))
 677
 678 #define WA_WRITE(addr, val) WA_REG(addr, 0xffffffff, val)
 679
 680 static int wa_ring_whitelist_reg(struct intel_engine_cs *engine,
 681                                  i915_reg_t reg)
 682 {
 683         struct drm_i915_private *dev_priv = engine->i915;
 684         struct i915_workarounds *wa = &dev_priv->workarounds;
 685         const uint32_t index = wa->hw_whitelist_count[engine->id];
 686
 687         if (WARN_ON(index >= RING_MAX_NONPRIV_SLOTS))
 688                 return -EINVAL;
 689
 690         WA_WRITE(RING_FORCE_TO_NONPRIV(engine->mmio_base, index),
 691                  i915_mmio_reg_offset(reg));
 692         wa->hw_whitelist_count[engine->id]++;
 693
 694         return 0;
 695 }
 696
 697 static int gen8_init_workarounds(struct intel_engine_cs *engine)
 698 {
 699         struct drm_i915_private *dev_priv = engine->i915;
 700
 701         WA_SET_BIT_MASKED(INSTPM, INSTPM_FORCE_ORDERING);
 702
 703         /* WaDisableAsyncFlipPerfMode:bdw,chv */
 704         WA_SET_BIT_MASKED(MI_MODE, ASYNC_FLIP_PERF_DISABLE);
 705
 706         /* WaDisablePartialInstShootdown:bdw,chv */
 707         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
 708                           PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);
 709
 710         /* Use Force Non-Coherent whenever executing a 3D context. This is a
 711          * workaround for for a possible hang in the unlikely event a TLB
 712          * invalidation occurs during a PSD flush.
 713          */
 714         /* WaForceEnableNonCoherent:bdw,chv */
 715         /* WaHdcDisableFetchWhenMasked:bdw,chv */
 716         WA_SET_BIT_MASKED(HDC_CHICKEN0,
 717                           HDC_DONOT_FETCH_MEM_WHEN_MASKED |
 718                           HDC_FORCE_NON_COHERENT);
 719
 720         /* From the Haswell PRM, Command Reference: Registers, CACHE_MODE_0:
 721          * "The Hierarchical Z RAW Stall Optimization allows non-overlapping
 722          *  polygons in the same 8x4 pixel/sample area to be processed without
 723          *  stalling waiting for the earlier ones to write to Hierarchical Z
 724          *  buffer."
 725          *
 726          * This optimization is off by default for BDW and CHV; turn it on.
 727          */
 728         WA_CLR_BIT_MASKED(CACHE_MODE_0_GEN7, HIZ_RAW_STALL_OPT_DISABLE);
 729
 730         /* Wa4x4STCOptimizationDisable:bdw,chv */
 731         WA_SET_BIT_MASKED(CACHE_MODE_1, GEN8_4x4_STC_OPTIMIZATION_DISABLE);
 732
 733         /*
 734          * BSpec recommends 8x4 when MSAA is used,
 735          * however in practice 16x4 seems fastest.
 736          *
 737          * Note that PS/WM thread counts depend on the WIZ hashing
 738          * disable bit, which we don't touch here, but it's good
 739          * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
 740          */
 741         WA_SET_FIELD_MASKED(GEN7_GT_MODE,
 742                             GEN6_WIZ_HASHING_MASK,
 743                             GEN6_WIZ_HASHING_16x4);
 744
 745         return 0;
 746 }
 747
 748 static int bdw_init_workarounds(struct intel_engine_cs *engine)
 749 {
 750         struct drm_i915_private *dev_priv = engine->i915;
 751         int ret;
 752
 753         ret = gen8_init_workarounds(engine);
 754         if (ret)
 755                 return ret;
 756
 757         /* WaDisableThreadStallDopClockGating:bdw (pre-production) */
 758         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, STALL_DOP_GATING_DISABLE);
 759
 760         /* WaDisableDopClockGating:bdw
 761          *
 762          * Also see the related UCGTCL1 write in broadwell_init_clock_gating()
 763          * to disable EUTC clock gating.
 764          */
 765         WA_SET_BIT_MASKED(GEN7_ROW_CHICKEN2,
 766                           DOP_CLOCK_GATING_DISABLE);
 767
 768         WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
 769                           GEN8_SAMPLER_POWER_BYPASS_DIS);
 770
 771         WA_SET_BIT_MASKED(HDC_CHICKEN0,
 772                           /* WaForceContextSaveRestoreNonCoherent:bdw */
 773                           HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT |
 774                           /* WaDisableFenceDestinationToSLM:bdw (pre-prod) */
 775                           (IS_BDW_GT3(dev_priv) ? HDC_FENCE_DEST_SLM_DISABLE : 0));
 776
 777         return 0;
 778 }
 779
 780 static int chv_init_workarounds(struct intel_engine_cs *engine)
 781 {
 782         struct drm_i915_private *dev_priv = engine->i915;
 783         int ret;
 784
 785         ret = gen8_init_workarounds(engine);
 786         if (ret)
 787                 return ret;
 788
 789         /* WaDisableThreadStallDopClockGating:chv */
 790         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, STALL_DOP_GATING_DISABLE);
 791
 792         /* Improve HiZ throughput on CHV. */
 793         WA_SET_BIT_MASKED(HIZ_CHICKEN, CHV_HZ_8X8_MODE_IN_1X);
 794
 795         return 0;
 796 }
 797
 798 static int gen9_init_workarounds(struct intel_engine_cs *engine)
 799 {
 800         struct drm_i915_private *dev_priv = engine->i915;
 801         int ret;
 802
 803         /* WaConextSwitchWithConcurrentTLBInvalidate:skl,bxt,kbl,glk,cfl */
 804         I915_WRITE(GEN9_CSFE_CHICKEN1_RCS, _MASKED_BIT_ENABLE(GEN9_PREEMPT_GPGPU_SYNC_SWITCH_DISABLE));
 805
 806         /* WaEnableLbsSlaRetryTimerDecrement:skl,bxt,kbl,glk,cfl */
 807         I915_WRITE(BDW_SCRATCH1, I915_READ(BDW_SCRATCH1) |
 808                    GEN9_LBS_SLA_RETRY_TIMER_DECREMENT_ENABLE);
 809
 810         /* WaDisableKillLogic:bxt,skl,kbl */
 811         if (!IS_COFFEELAKE(dev_priv))
 812                 I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
 813                            ECOCHK_DIS_TLB);
 814
 815         /* WaClearFlowControlGpgpuContextSave:skl,bxt,kbl,glk,cfl */
 816         /* WaDisablePartialInstShootdown:skl,bxt,kbl,glk,cfl */
 817         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
 818                           FLOW_CONTROL_ENABLE |
 819                           PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);
 820
 821         /* Syncing dependencies between camera and graphics:skl,bxt,kbl */
 822         if (!IS_COFFEELAKE(dev_priv))
 823                 WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
 824                                   GEN9_DISABLE_OCL_OOB_SUPPRESS_LOGIC);
 825
 826         /* WaDisableDgMirrorFixInHalfSliceChicken5:bxt */
 827         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
 828                 WA_CLR_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN5,
 829                                   GEN9_DG_MIRROR_FIX_ENABLE);
 830
 831         /* WaSetDisablePixMaskCammingAndRhwoInCommonSliceChicken:bxt */
 832         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) {
 833                 WA_SET_BIT_MASKED(GEN7_COMMON_SLICE_CHICKEN1,
 834                                   GEN9_RHWO_OPTIMIZATION_DISABLE);
 835                 /*
 836                  * WA also requires GEN9_SLICE_COMMON_ECO_CHICKEN0[14:14] to be set
 837                  * but we do that in per ctx batchbuffer as there is an issue
 838                  * with this register not getting restored on ctx restore
 839                  */
 840         }
 841
 842         /* WaEnableYV12BugFixInHalfSliceChicken7:skl,bxt,kbl,glk,cfl */
 843         /* WaEnableSamplerGPGPUPreemptionSupport:skl,bxt,kbl,cfl */
 844         WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,
 845                           GEN9_ENABLE_YV12_BUGFIX |
 846                           GEN9_ENABLE_GPGPU_PREEMPTION);
 847
 848         /* Wa4x4STCOptimizationDisable:skl,bxt,kbl,glk,cfl */
 849         /* WaDisablePartialResolveInVc:skl,bxt,kbl,cfl */
 850         WA_SET_BIT_MASKED(CACHE_MODE_1, (GEN8_4x4_STC_OPTIMIZATION_DISABLE |
 851                                          GEN9_PARTIAL_RESOLVE_IN_VC_DISABLE));
 852
 853         /* WaCcsTlbPrefetchDisable:skl,bxt,kbl,glk,cfl */
 854         WA_CLR_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN5,
 855                           GEN9_CCS_TLB_PREFETCH_ENABLE);
 856
 857         /* WaDisableMaskBasedCammingInRCC:bxt */
 858         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
 859                 WA_SET_BIT_MASKED(SLICE_ECO_CHICKEN0,
 860                                   PIXEL_MASK_CAMMING_DISABLE);
 861
 862         /* WaForceContextSaveRestoreNonCoherent:skl,bxt,kbl,cfl */
 863         WA_SET_BIT_MASKED(HDC_CHICKEN0,
 864                           HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT |
 865                           HDC_FORCE_CSR_NON_COHERENT_OVR_DISABLE);
 866
 867         /* WaForceEnableNonCoherent and WaDisableHDCInvalidation are
 868          * both tied to WaForceContextSaveRestoreNonCoherent
 869          * in some hsds for skl. We keep the tie for all gen9. The
 870          * documentation is a bit hazy and so we want to get common behaviour,
 871          * even though there is no clear evidence we would need both on kbl/bxt.
 872          * This area has been source of system hangs so we play it safe
 873          * and mimic the skl regardless of what bspec says.
 874          *
 875          * Use Force Non-Coherent whenever executing a 3D context. This
 876          * is a workaround for a possible hang in the unlikely event
 877          * a TLB invalidation occurs during a PSD flush.
 878          */
 879
 880         /* WaForceEnableNonCoherent:skl,bxt,kbl,cfl */
 881         WA_SET_BIT_MASKED(HDC_CHICKEN0,
 882                           HDC_FORCE_NON_COHERENT);
 883
 884         /* WaDisableHDCInvalidation:skl,bxt,kbl,cfl */
 885         I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
 886                    BDW_DISABLE_HDC_INVALIDATION);
 887
 888         /* WaDisableSamplerPowerBypassForSOPingPong:skl,bxt,kbl,cfl */
 889         if (IS_SKYLAKE(dev_priv) ||
 890             IS_KABYLAKE(dev_priv) ||
 891             IS_COFFEELAKE(dev_priv) ||
 892             IS_BXT_REVID(dev_priv, 0, BXT_REVID_B0))
 893                 WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
 894                                   GEN8_SAMPLER_POWER_BYPASS_DIS);
 895
 896         /* WaDisableSTUnitPowerOptimization:skl,bxt,kbl,glk,cfl */
 897         WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN2, GEN8_ST_PO_DISABLE);
 898
 899         /* WaOCLCoherentLineFlush:skl,bxt,kbl,cfl */
 900         I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) |
 901                                     GEN8_LQSC_FLUSH_COHERENT_LINES));
 902
 903         /* WaClearHIZ_WM_CHICKEN3:bxt,glk */
 904         if (IS_GEN9_LP(dev_priv))
 905                 WA_SET_BIT_MASKED(GEN9_WM_CHICKEN3, GEN9_FACTOR_IN_CLR_VAL_HIZ);
 906
 907         /* WaVFEStateAfterPipeControlwithMediaStateClear:skl,bxt,glk,cfl */
 908         ret = wa_ring_whitelist_reg(engine, GEN9_CTX_PREEMPT_REG);
 909         if (ret)
 910                 return ret;
 911
 912         /* WaEnablePreemptionGranularityControlByUMD:skl,bxt,kbl,cfl */
 913         ret= wa_ring_whitelist_reg(engine, GEN8_CS_CHICKEN1);
 914         if (ret)
 915                 return ret;
 916
 917         /* WaAllowUMDToModifyHDCChicken1:skl,bxt,kbl,glk,cfl */
 918         ret = wa_ring_whitelist_reg(engine, GEN8_HDC_CHICKEN1);
 919         if (ret)
 920                 return ret;
 921
 922         return 0;
 923 }
 924
 925 static int skl_tune_iz_hashing(struct intel_engine_cs *engine)
 926 {
 927         struct drm_i915_private *dev_priv = engine->i915;
 928         u8 vals[3] = { 0, 0, 0 };
 929         unsigned int i;
 930
 931         for (i = 0; i < 3; i++) {
 932                 u8 ss;
 933
 934                 /*
 935                  * Only consider slices where one, and only one, subslice has 7
 936                  * EUs
 937                  */
 938                 if (!is_power_of_2(INTEL_INFO(dev_priv)->sseu.subslice_7eu[i]))
 939                         continue;
 940
 941                 /*
 942                  * subslice_7eu[i] != 0 (because of the check above) and
 943                  * ss_max == 4 (maximum number of subslices possible per slice)
 944                  *
 945                  * ->    0 <= ss <= 3;
 946                  */
 947                 ss = ffs(INTEL_INFO(dev_priv)->sseu.subslice_7eu[i]) - 1;
 948                 vals[i] = 3 - ss;
 949         }
 950
 951         if (vals[0] == 0 && vals[1] == 0 && vals[2] == 0)
 952                 return 0;
 953
 954         /* Tune IZ hashing. See intel_device_info_runtime_init() */
 955         WA_SET_FIELD_MASKED(GEN7_GT_MODE,
 956                             GEN9_IZ_HASHING_MASK(2) |
 957                             GEN9_IZ_HASHING_MASK(1) |
 958                             GEN9_IZ_HASHING_MASK(0),
 959                             GEN9_IZ_HASHING(2, vals[2]) |
 960                             GEN9_IZ_HASHING(1, vals[1]) |
 961                             GEN9_IZ_HASHING(0, vals[0]));
 962
 963         return 0;
 964 }
 965
 966 static int skl_init_workarounds(struct intel_engine_cs *engine)
 967 {
 968         struct drm_i915_private *dev_priv = engine->i915;
 969         int ret;
 970
 971         ret = gen9_init_workarounds(engine);
 972         if (ret)
 973                 return ret;
 974
 975         /*
 976          * Actual WA is to disable percontext preemption granularity control
 977          * until D0 which is the default case so this is equivalent to
 978          * !WaDisablePerCtxtPreemptionGranularityControl:skl
 979          */
 980         I915_WRITE(GEN7_FF_SLICE_CS_CHICKEN1,
 981                    _MASKED_BIT_ENABLE(GEN9_FFSC_PERCTX_PREEMPT_CTRL));
 982
 983         /* WaEnableGapsTsvCreditFix:skl */
 984         I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
 985                                    GEN9_GAPS_TSV_CREDIT_DISABLE));
 986
 987         /* WaDisableGafsUnitClkGating:skl */
 988         WA_SET_BIT(GEN7_UCGCTL4, GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE);
 989
 990         /* WaInPlaceDecompressionHang:skl */
 991         if (IS_SKL_REVID(dev_priv, SKL_REVID_H0, REVID_FOREVER))
 992                 WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
 993                            GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
 994
 995         /* WaDisableLSQCROPERFforOCL:skl */
 996         ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
 997         if (ret)
 998                 return ret;
 999
1000         return skl_tune_iz_hashing(engine);
1001 }
1002
1003 static int bxt_init_workarounds(struct intel_engine_cs *engine)
1004 {
1005         struct drm_i915_private *dev_priv = engine->i915;
1006         int ret;
1007
1008         ret = gen9_init_workarounds(engine);
1009         if (ret)
1010                 return ret;
1011
1012         /* WaStoreMultiplePTEenable:bxt */
1013         /* This is a requirement according to Hardware specification */
1014         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
1015                 I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_TLBPF);
1016
1017         /* WaSetClckGatingDisableMedia:bxt */
1018         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) {
1019                 I915_WRITE(GEN7_MISCCPCTL, (I915_READ(GEN7_MISCCPCTL) &
1020                                             ~GEN8_DOP_CLOCK_GATE_MEDIA_ENABLE));
1021         }
1022
1023         /* WaDisableThreadStallDopClockGating:bxt */
1024         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
1025                           STALL_DOP_GATING_DISABLE);
1026
1027         /* WaDisablePooledEuLoadBalancingFix:bxt */
1028         if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) {
1029                 WA_SET_BIT_MASKED(FF_SLICE_CS_CHICKEN2,
1030                                   GEN9_POOLED_EU_LOAD_BALANCING_FIX_DISABLE);
1031         }
1032
1033         /* WaDisableSbeCacheDispatchPortSharing:bxt */
1034         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_B0)) {
1035                 WA_SET_BIT_MASKED(
1036                         GEN7_HALF_SLICE_CHICKEN1,
1037                         GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);
1038         }
1039
1040         /* WaDisableObjectLevelPreemptionForTrifanOrPolygon:bxt */
1041         /* WaDisableObjectLevelPreemptionForInstancedDraw:bxt */
1042         /* WaDisableObjectLevelPreemtionForInstanceId:bxt */
1043         /* WaDisableLSQCROPERFforOCL:bxt */
1044         if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) {
1045                 ret = wa_ring_whitelist_reg(engine, GEN9_CS_DEBUG_MODE1);
1046                 if (ret)
1047                         return ret;
1048
1049                 ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
1050                 if (ret)
1051                         return ret;
1052         }
1053
1054         /* WaProgramL3SqcReg1DefaultForPerf:bxt */
1055         if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) {
1056                 u32 val = I915_READ(GEN8_L3SQCREG1);
1057                 val &= ~L3_PRIO_CREDITS_MASK;
1058                 val |= L3_GENERAL_PRIO_CREDITS(62) | L3_HIGH_PRIO_CREDITS(2);
1059                 I915_WRITE(GEN8_L3SQCREG1, val);
1060         }
1061
1062         /* WaToEnableHwFixForPushConstHWBug:bxt */
1063         if (IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER))
1064                 WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
1065                                   GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
1066
1067         /* WaInPlaceDecompressionHang:bxt */
1068         if (IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER))
1069                 WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
1070                            GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
1071
1072         return 0;
1073 }
1074
1075 static int kbl_init_workarounds(struct intel_engine_cs *engine)
1076 {
1077         struct drm_i915_private *dev_priv = engine->i915;
1078         int ret;
1079
1080         ret = gen9_init_workarounds(engine);
1081         if (ret)
1082                 return ret;
1083
1084         /* WaEnableGapsTsvCreditFix:kbl */
1085         I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
1086                                    GEN9_GAPS_TSV_CREDIT_DISABLE));
1087
1088         /* WaDisableDynamicCreditSharing:kbl */
1089         if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
1090                 WA_SET_BIT(GAMT_CHKN_BIT_REG,
1091                            GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING);
1092
1093         /* WaDisableFenceDestinationToSLM:kbl (pre-prod) */
1094         if (IS_KBL_REVID(dev_priv, KBL_REVID_A0, KBL_REVID_A0))
1095                 WA_SET_BIT_MASKED(HDC_CHICKEN0,
1096                                   HDC_FENCE_DEST_SLM_DISABLE);
1097
1098         /* WaToEnableHwFixForPushConstHWBug:kbl */
1099         if (IS_KBL_REVID(dev_priv, KBL_REVID_C0, REVID_FOREVER))
1100                 WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
1101                                   GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
1102
1103         /* WaDisableGafsUnitClkGating:kbl */
1104         WA_SET_BIT(GEN7_UCGCTL4, GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE);
1105
1106         /* WaDisableSbeCacheDispatchPortSharing:kbl */
1107         WA_SET_BIT_MASKED(
1108                 GEN7_HALF_SLICE_CHICKEN1,
1109                 GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);
1110
1111         /* WaInPlaceDecompressionHang:kbl */
1112         WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
1113                    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
1114
1115         /* WaDisableLSQCROPERFforOCL:kbl */
1116         ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
1117         if (ret)
1118                 return ret;
1119
1120         return 0;
1121 }
1122
1123 static int glk_init_workarounds(struct intel_engine_cs *engine)
1124 {
1125         struct drm_i915_private *dev_priv = engine->i915;
1126         int ret;
1127
1128         ret = gen9_init_workarounds(engine);
1129         if (ret)
1130                 return ret;
1131
1132         /* WA #0862: Userspace has to set "Barrier Mode" to avoid hangs. */
1133         ret = wa_ring_whitelist_reg(engine, GEN9_SLICE_COMMON_ECO_CHICKEN1);
1134         if (ret)
1135                 return ret;
1136
1137         /* WaToEnableHwFixForPushConstHWBug:glk */
1138         WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
1139                           GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
1140
1141         return 0;
1142 }
1143
1144 static int cfl_init_workarounds(struct intel_engine_cs *engine)
1145 {
1146         struct drm_i915_private *dev_priv = engine->i915;
1147         int ret;
1148
1149         ret = gen9_init_workarounds(engine);
1150         if (ret)
1151                 return ret;
1152
1153         /* WaEnableGapsTsvCreditFix:cfl */
1154         I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
1155                                    GEN9_GAPS_TSV_CREDIT_DISABLE));
1156
1157         /* WaToEnableHwFixForPushConstHWBug:cfl */
1158         WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
1159                           GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
1160
1161         /* WaDisableGafsUnitClkGating:cfl */
1162         WA_SET_BIT(GEN7_UCGCTL4, GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE);
1163
1164         /* WaDisableSbeCacheDispatchPortSharing:cfl */
1165         WA_SET_BIT_MASKED(
1166                 GEN7_HALF_SLICE_CHICKEN1,
1167                 GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);
1168
1169         /* WaInPlaceDecompressionHang:cfl */
1170         WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
1171                    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
1172
1173         return 0;
1174 }
1175
1176 int init_workarounds_ring(struct intel_engine_cs *engine)
1177 {
1178         struct drm_i915_private *dev_priv = engine->i915;
1179         int err;
1180
1181         WARN_ON(engine->id != RCS);
1182
1183         dev_priv->workarounds.count = 0;
1184         dev_priv->workarounds.hw_whitelist_count[engine->id] = 0;
1185
1186         if (IS_BROADWELL(dev_priv))
1187                 err = bdw_init_workarounds(engine);
1188         else if (IS_CHERRYVIEW(dev_priv))
1189                 err = chv_init_workarounds(engine);
1190         else if (IS_SKYLAKE(dev_priv))
1191                 err =  skl_init_workarounds(engine);
1192         else if (IS_BROXTON(dev_priv))
1193                 err = bxt_init_workarounds(engine);
1194         else if (IS_KABYLAKE(dev_priv))
1195                 err = kbl_init_workarounds(engine);
1196         else if (IS_GEMINILAKE(dev_priv))
1197                 err =  glk_init_workarounds(engine);
1198         else if (IS_COFFEELAKE(dev_priv))
1199                 err = cfl_init_workarounds(engine);
1200         else
1201                 err = 0;
1202         if (err)
1203                 return err;
1204
1205         DRM_DEBUG_DRIVER("%s: Number of context specific w/a: %d\n",
1206                          engine->name, dev_priv->workarounds.count);
1207         return 0;
1208 }
1209
1210 int intel_ring_workarounds_emit(struct drm_i915_gem_request *req)
1211 {
1212         struct i915_workarounds *w = &req->i915->workarounds;
1213         u32 *cs;
1214         int ret, i;
1215
1216         if (w->count == 0)
1217                 return 0;
1218
1219         ret = req->engine->emit_flush(req, EMIT_BARRIER);
1220         if (ret)
1221                 return ret;
1222
1223         cs = intel_ring_begin(req, (w->count * 2 + 2));
1224         if (IS_ERR(cs))
1225                 return PTR_ERR(cs);
1226
1227         *cs++ = MI_LOAD_REGISTER_IMM(w->count);
1228         for (i = 0; i < w->count; i++) {
1229                 *cs++ = i915_mmio_reg_offset(w->reg[i].addr);
1230                 *cs++ = w->reg[i].value;
1231         }
1232         *cs++ = MI_NOOP;
1233
1234         intel_ring_advance(req, cs);
1235
1236         ret = req->engine->emit_flush(req, EMIT_BARRIER);
1237         if (ret)
1238                 return ret;
1239
1240         return 0;
1241 }
1242
1243 static bool ring_is_idle(struct intel_engine_cs *engine)
1244 {
1245         struct drm_i915_private *dev_priv = engine->i915;
1246         bool idle = true;
1247
1248         intel_runtime_pm_get(dev_priv);
1249
1250         /* First check that no commands are left in the ring */
1251         if ((I915_READ_HEAD(engine) & HEAD_ADDR) !=
1252             (I915_READ_TAIL(engine) & TAIL_ADDR))
1253                 idle = false;
1254
1255         /* No bit for gen2, so assume the CS parser is idle */
1256         if (INTEL_GEN(dev_priv) > 2 && !(I915_READ_MODE(engine) & MODE_IDLE))
1257                 idle = false;
1258
1259         intel_runtime_pm_put(dev_priv);
1260
1261         return idle;
1262 }
1263
1264 /**
1265  * intel_engine_is_idle() - Report if the engine has finished process all work
1266  * @engine: the intel_engine_cs
1267  *
1268  * Return true if there are no requests pending, nothing left to be submitted
1269  * to hardware, and that the engine is idle.
1270  */
1271 bool intel_engine_is_idle(struct intel_engine_cs *engine)
1272 {
1273         struct drm_i915_private *dev_priv = engine->i915;
1274
1275         /* More white lies, if wedged, hw state is inconsistent */
1276         if (i915_terminally_wedged(&dev_priv->gpu_error))
1277                 return true;
1278
1279         /* Any inflight/incomplete requests? */
1280         if (!i915_seqno_passed(intel_engine_get_seqno(engine),
1281                                intel_engine_last_submit(engine)))
1282                 return false;
1283
1284         if (I915_SELFTEST_ONLY(engine->breadcrumbs.mock))
1285                 return true;
1286
1287         /* Interrupt/tasklet pending? */
1288         if (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted))
1289                 return false;
1290
1291         /* Both ports drained, no more ELSP submission? */
1292         if (port_request(&engine->execlist_port[0]))
1293                 return false;
1294
1295         /* ELSP is empty, but there are ready requests? */
1296         if (READ_ONCE(engine->execlist_first))
1297                 return false;
1298
1299         /* Ring stopped? */
1300         if (!ring_is_idle(engine))
1301                 return false;
1302
1303         return true;
1304 }
1305
1306 bool intel_engines_are_idle(struct drm_i915_private *dev_priv)
1307 {
1308         struct intel_engine_cs *engine;
1309         enum intel_engine_id id;
1310
1311         if (READ_ONCE(dev_priv->gt.active_requests))
1312                 return false;
1313
1314         /* If the driver is wedged, HW state may be very inconsistent and
1315          * report that it is still busy, even though we have stopped using it.
1316          */
1317         if (i915_terminally_wedged(&dev_priv->gpu_error))
1318                 return true;
1319
1320         for_each_engine(engine, dev_priv, id) {
1321                 if (!intel_engine_is_idle(engine))
1322                         return false;
1323         }
1324
1325         return true;
1326 }
1327
1328 void intel_engines_reset_default_submission(struct drm_i915_private *i915)
1329 {
1330         struct intel_engine_cs *engine;
1331         enum intel_engine_id id;
1332
1333         for_each_engine(engine, i915, id)
1334                 engine->set_default_submission(engine);
1335 }
1336
1337 void intel_engines_mark_idle(struct drm_i915_private *i915)
1338 {
1339         struct intel_engine_cs *engine;
1340         enum intel_engine_id id;
1341
1342         for_each_engine(engine, i915, id) {
1343                 intel_engine_disarm_breadcrumbs(engine);
1344                 i915_gem_batch_pool_fini(&engine->batch_pool);
1345                 tasklet_kill(&engine->irq_tasklet);
1346                 engine->no_priolist = false;
1347         }
1348 }
1349
1350 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
1351 #include "selftests/mock_engine.c"
1352 #endif