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 static const struct engine_info {
  30         const char *name;
  31         unsigned exec_id;
  32         enum intel_engine_hw_id hw_id;
  33         u32 mmio_base;
  34         unsigned irq_shift;
  35         int (*init_legacy)(struct intel_engine_cs *engine);
  36         int (*init_execlists)(struct intel_engine_cs *engine);
  37 } intel_engines[] = {
  38         [RCS] = {
  39                 .name = "render ring",
  40                 .exec_id = I915_EXEC_RENDER,
  41                 .hw_id = RCS_HW,
  42                 .mmio_base = RENDER_RING_BASE,
  43                 .irq_shift = GEN8_RCS_IRQ_SHIFT,
  44                 .init_execlists = logical_render_ring_init,
  45                 .init_legacy = intel_init_render_ring_buffer,
  46         },
  47         [BCS] = {
  48                 .name = "blitter ring",
  49                 .exec_id = I915_EXEC_BLT,
  50                 .hw_id = BCS_HW,
  51                 .mmio_base = BLT_RING_BASE,
  52                 .irq_shift = GEN8_BCS_IRQ_SHIFT,
  53                 .init_execlists = logical_xcs_ring_init,
  54                 .init_legacy = intel_init_blt_ring_buffer,
  55         },
  56         [VCS] = {
  57                 .name = "bsd ring",
  58                 .exec_id = I915_EXEC_BSD,
  59                 .hw_id = VCS_HW,
  60                 .mmio_base = GEN6_BSD_RING_BASE,
  61                 .irq_shift = GEN8_VCS1_IRQ_SHIFT,
  62                 .init_execlists = logical_xcs_ring_init,
  63                 .init_legacy = intel_init_bsd_ring_buffer,
  64         },
  65         [VCS2] = {
  66                 .name = "bsd2 ring",
  67                 .exec_id = I915_EXEC_BSD,
  68                 .hw_id = VCS2_HW,
  69                 .mmio_base = GEN8_BSD2_RING_BASE,
  70                 .irq_shift = GEN8_VCS2_IRQ_SHIFT,
  71                 .init_execlists = logical_xcs_ring_init,
  72                 .init_legacy = intel_init_bsd2_ring_buffer,
  73         },
  74         [VECS] = {
  75                 .name = "video enhancement ring",
  76                 .exec_id = I915_EXEC_VEBOX,
  77                 .hw_id = VECS_HW,
  78                 .mmio_base = VEBOX_RING_BASE,
  79                 .irq_shift = GEN8_VECS_IRQ_SHIFT,
  80                 .init_execlists = logical_xcs_ring_init,
  81                 .init_legacy = intel_init_vebox_ring_buffer,
  82         },
  83 };
  84
  85 static int
  86 intel_engine_setup(struct drm_i915_private *dev_priv,
  87                    enum intel_engine_id id)
  88 {
  89         const struct engine_info *info = &intel_engines[id];
  90         struct intel_engine_cs *engine;
  91
  92         GEM_BUG_ON(dev_priv->engine[id]);
  93         engine = kzalloc(sizeof(*engine), GFP_KERNEL);
  94         if (!engine)
  95                 return -ENOMEM;
  96
  97         engine->id = id;
  98         engine->i915 = dev_priv;
  99         engine->name = info->name;
 100         engine->exec_id = info->exec_id;
 101         engine->hw_id = engine->guc_id = info->hw_id;
 102         engine->mmio_base = info->mmio_base;
 103         engine->irq_shift = info->irq_shift;
 104
 105         dev_priv->engine[id] = engine;
 106         return 0;
 107 }
 108
 109 /**
 110  * intel_engines_init() - allocate, populate and init the Engine Command Streamers
 111  * @dev: DRM device.
 112  *
 113  * Return: non-zero if the initialization failed.
 114  */
 115 int intel_engines_init(struct drm_device *dev)
 116 {
 117         struct drm_i915_private *dev_priv = to_i915(dev);
 118         struct intel_device_info *device_info = mkwrite_device_info(dev_priv);
 119         unsigned int ring_mask = INTEL_INFO(dev_priv)->ring_mask;
 120         unsigned int mask = 0;
 121         int (*init)(struct intel_engine_cs *engine);
 122         struct intel_engine_cs *engine;
 123         enum intel_engine_id id;
 124         unsigned int i;
 125         int ret;
 126
 127         WARN_ON(ring_mask == 0);
 128         WARN_ON(ring_mask &
 129                 GENMASK(sizeof(mask) * BITS_PER_BYTE - 1, I915_NUM_ENGINES));
 130
 131         for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
 132                 if (!HAS_ENGINE(dev_priv, i))
 133                         continue;
 134
 135                 if (i915.enable_execlists)
 136                         init = intel_engines[i].init_execlists;
 137                 else
 138                         init = intel_engines[i].init_legacy;
 139
 140                 if (!init)
 141                         continue;
 142
 143                 ret = intel_engine_setup(dev_priv, i);
 144                 if (ret)
 145                         goto cleanup;
 146
 147                 ret = init(dev_priv->engine[i]);
 148                 if (ret)
 149                         goto cleanup;
 150
 151                 mask |= ENGINE_MASK(i);
 152         }
 153
 154         /*
 155          * Catch failures to update intel_engines table when the new engines
 156          * are added to the driver by a warning and disabling the forgotten
 157          * engines.
 158          */
 159         if (WARN_ON(mask != ring_mask))
 160                 device_info->ring_mask = mask;
 161
 162         device_info->num_rings = hweight32(mask);
 163
 164         return 0;
 165
 166 cleanup:
 167         for_each_engine(engine, dev_priv, id) {
 168                 if (i915.enable_execlists)
 169                         intel_logical_ring_cleanup(engine);
 170                 else
 171                         intel_engine_cleanup(engine);
 172         }
 173
 174         return ret;
 175 }
 176
 177 void intel_engine_init_seqno(struct intel_engine_cs *engine, u32 seqno)
 178 {
 179         struct drm_i915_private *dev_priv = engine->i915;
 180
 181         /* Our semaphore implementation is strictly monotonic (i.e. we proceed
 182          * so long as the semaphore value in the register/page is greater
 183          * than the sync value), so whenever we reset the seqno,
 184          * so long as we reset the tracking semaphore value to 0, it will
 185          * always be before the next request's seqno. If we don't reset
 186          * the semaphore value, then when the seqno moves backwards all
 187          * future waits will complete instantly (causing rendering corruption).
 188          */
 189         if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
 190                 I915_WRITE(RING_SYNC_0(engine->mmio_base), 0);
 191                 I915_WRITE(RING_SYNC_1(engine->mmio_base), 0);
 192                 if (HAS_VEBOX(dev_priv))
 193                         I915_WRITE(RING_SYNC_2(engine->mmio_base), 0);
 194         }
 195         if (dev_priv->semaphore) {
 196                 struct page *page = i915_vma_first_page(dev_priv->semaphore);
 197                 void *semaphores;
 198
 199                 /* Semaphores are in noncoherent memory, flush to be safe */
 200                 semaphores = kmap(page);
 201                 memset(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
 202                        0, I915_NUM_ENGINES * gen8_semaphore_seqno_size);
 203                 drm_clflush_virt_range(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
 204                                        I915_NUM_ENGINES * gen8_semaphore_seqno_size);
 205                 kunmap(page);
 206         }
 207         memset(engine->semaphore.sync_seqno, 0,
 208                sizeof(engine->semaphore.sync_seqno));
 209
 210         intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
 211         if (engine->irq_seqno_barrier)
 212                 engine->irq_seqno_barrier(engine);
 213         engine->last_submitted_seqno = seqno;
 214
 215         engine->hangcheck.seqno = seqno;
 216
 217         /* After manually advancing the seqno, fake the interrupt in case
 218          * there are any waiters for that seqno.
 219          */
 220         intel_engine_wakeup(engine);
 221 }
 222
 223 void intel_engine_init_hangcheck(struct intel_engine_cs *engine)
 224 {
 225         memset(&engine->hangcheck, 0, sizeof(engine->hangcheck));
 226 }
 227
 228 static void intel_engine_init_requests(struct intel_engine_cs *engine)
 229 {
 230         init_request_active(&engine->last_request, NULL);
 231         INIT_LIST_HEAD(&engine->request_list);
 232 }
 233
 234 /**
 235  * intel_engines_setup_common - setup engine state not requiring hw access
 236  * @engine: Engine to setup.
 237  *
 238  * Initializes @engine@ structure members shared between legacy and execlists
 239  * submission modes which do not require hardware access.
 240  *
 241  * Typically done early in the submission mode specific engine setup stage.
 242  */
 243 void intel_engine_setup_common(struct intel_engine_cs *engine)
 244 {
 245         INIT_LIST_HEAD(&engine->execlist_queue);
 246         spin_lock_init(&engine->execlist_lock);
 247
 248         engine->fence_context = fence_context_alloc(1);
 249
 250         intel_engine_init_requests(engine);
 251         intel_engine_init_hangcheck(engine);
 252         i915_gem_batch_pool_init(engine, &engine->batch_pool);
 253
 254         intel_engine_init_cmd_parser(engine);
 255 }
 256
 257 int intel_engine_create_scratch(struct intel_engine_cs *engine, int size)
 258 {
 259         struct drm_i915_gem_object *obj;
 260         struct i915_vma *vma;
 261         int ret;
 262
 263         WARN_ON(engine->scratch);
 264
 265         obj = i915_gem_object_create_stolen(&engine->i915->drm, size);
 266         if (!obj)
 267                 obj = i915_gem_object_create(&engine->i915->drm, size);
 268         if (IS_ERR(obj)) {
 269                 DRM_ERROR("Failed to allocate scratch page\n");
 270                 return PTR_ERR(obj);
 271         }
 272
 273         vma = i915_vma_create(obj, &engine->i915->ggtt.base, NULL);
 274         if (IS_ERR(vma)) {
 275                 ret = PTR_ERR(vma);
 276                 goto err_unref;
 277         }
 278
 279         ret = i915_vma_pin(vma, 0, 4096, PIN_GLOBAL | PIN_HIGH);
 280         if (ret)
 281                 goto err_unref;
 282
 283         engine->scratch = vma;
 284         DRM_DEBUG_DRIVER("%s pipe control offset: 0x%08x\n",
 285                          engine->name, i915_ggtt_offset(vma));
 286         return 0;
 287
 288 err_unref:
 289         i915_gem_object_put(obj);
 290         return ret;
 291 }
 292
 293 static void intel_engine_cleanup_scratch(struct intel_engine_cs *engine)
 294 {
 295         i915_vma_unpin_and_release(&engine->scratch);
 296 }
 297
 298 /**
 299  * intel_engines_init_common - initialize cengine state which might require hw access
 300  * @engine: Engine to initialize.
 301  *
 302  * Initializes @engine@ structure members shared between legacy and execlists
 303  * submission modes which do require hardware access.
 304  *
 305  * Typcally done at later stages of submission mode specific engine setup.
 306  *
 307  * Returns zero on success or an error code on failure.
 308  */
 309 int intel_engine_init_common(struct intel_engine_cs *engine)
 310 {
 311         int ret;
 312
 313         ret = intel_engine_init_breadcrumbs(engine);
 314         if (ret)
 315                 return ret;
 316
 317         return 0;
 318 }
 319
 320 /**
 321  * intel_engines_cleanup_common - cleans up the engine state created by
 322  *                                the common initiailizers.
 323  * @engine: Engine to cleanup.
 324  *
 325  * This cleans up everything created by the common helpers.
 326  */
 327 void intel_engine_cleanup_common(struct intel_engine_cs *engine)
 328 {
 329         intel_engine_cleanup_scratch(engine);
 330
 331         intel_engine_fini_breadcrumbs(engine);
 332         intel_engine_cleanup_cmd_parser(engine);
 333         i915_gem_batch_pool_fini(&engine->batch_pool);
 334 }
 335
 336 u64 intel_engine_get_active_head(struct intel_engine_cs *engine)
 337 {
 338         struct drm_i915_private *dev_priv = engine->i915;
 339         u64 acthd;
 340
 341         if (INTEL_GEN(dev_priv) >= 8)
 342                 acthd = I915_READ64_2x32(RING_ACTHD(engine->mmio_base),
 343                                          RING_ACTHD_UDW(engine->mmio_base));
 344         else if (INTEL_GEN(dev_priv) >= 4)
 345                 acthd = I915_READ(RING_ACTHD(engine->mmio_base));
 346         else
 347                 acthd = I915_READ(ACTHD);
 348
 349         return acthd;
 350 }
 351
 352 u64 intel_engine_get_last_batch_head(struct intel_engine_cs *engine)
 353 {
 354         struct drm_i915_private *dev_priv = engine->i915;
 355         u64 bbaddr;
 356
 357         if (INTEL_GEN(dev_priv) >= 8)
 358                 bbaddr = I915_READ64_2x32(RING_BBADDR(engine->mmio_base),
 359                                           RING_BBADDR_UDW(engine->mmio_base));
 360         else
 361                 bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));
 362
 363         return bbaddr;
 364 }
 365
 366 const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
 367 {
 368         switch (type) {
 369         case I915_CACHE_NONE: return " uncached";
 370         case I915_CACHE_LLC: return HAS_LLC(i915) ? " LLC" : " snooped";
 371         case I915_CACHE_L3_LLC: return " L3+LLC";
 372         case I915_CACHE_WT: return " WT";
 373         default: return "";
 374         }
 375 }
 376
 377 static inline uint32_t
 378 read_subslice_reg(struct drm_i915_private *dev_priv, int slice,
 379                   int subslice, i915_reg_t reg)
 380 {
 381         uint32_t mcr;
 382         uint32_t ret;
 383         enum forcewake_domains fw_domains;
 384
 385         fw_domains = intel_uncore_forcewake_for_reg(dev_priv, reg,
 386                                                     FW_REG_READ);
 387         fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
 388                                                      GEN8_MCR_SELECTOR,
 389                                                      FW_REG_READ | FW_REG_WRITE);
 390
 391         spin_lock_irq(&dev_priv->uncore.lock);
 392         intel_uncore_forcewake_get__locked(dev_priv, fw_domains);
 393
 394         mcr = I915_READ_FW(GEN8_MCR_SELECTOR);
 395         /*
 396          * The HW expects the slice and sublice selectors to be reset to 0
 397          * after reading out the registers.
 398          */
 399         WARN_ON_ONCE(mcr & (GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK));
 400         mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
 401         mcr |= GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);
 402         I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);
 403
 404         ret = I915_READ_FW(reg);
 405
 406         mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
 407         I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);
 408
 409         intel_uncore_forcewake_put__locked(dev_priv, fw_domains);
 410         spin_unlock_irq(&dev_priv->uncore.lock);
 411
 412         return ret;
 413 }
 414
 415 /* NB: please notice the memset */
 416 void intel_engine_get_instdone(struct intel_engine_cs *engine,
 417                                struct intel_instdone *instdone)
 418 {
 419         struct drm_i915_private *dev_priv = engine->i915;
 420         u32 mmio_base = engine->mmio_base;
 421         int slice;
 422         int subslice;
 423
 424         memset(instdone, 0, sizeof(*instdone));
 425
 426         switch (INTEL_GEN(dev_priv)) {
 427         default:
 428                 instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
 429
 430                 if (engine->id != RCS)
 431                         break;
 432
 433                 instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
 434                 for_each_instdone_slice_subslice(dev_priv, slice, subslice) {
 435                         instdone->sampler[slice][subslice] =
 436                                 read_subslice_reg(dev_priv, slice, subslice,
 437                                                   GEN7_SAMPLER_INSTDONE);
 438                         instdone->row[slice][subslice] =
 439                                 read_subslice_reg(dev_priv, slice, subslice,
 440                                                   GEN7_ROW_INSTDONE);
 441                 }
 442                 break;
 443         case 7:
 444                 instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
 445
 446                 if (engine->id != RCS)
 447                         break;
 448
 449                 instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
 450                 instdone->sampler[0][0] = I915_READ(GEN7_SAMPLER_INSTDONE);
 451                 instdone->row[0][0] = I915_READ(GEN7_ROW_INSTDONE);
 452
 453                 break;
 454         case 6:
 455         case 5:
 456         case 4:
 457                 instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));
 458
 459                 if (engine->id == RCS)
 460                         /* HACK: Using the wrong struct member */
 461                         instdone->slice_common = I915_READ(GEN4_INSTDONE1);
 462                 break;
 463         case 3:
 464         case 2:
 465                 instdone->instdone = I915_READ(GEN2_INSTDONE);
 466                 break;
 467         }
 468 }