drivers/gpu/drm/v3d/v3d_gem.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (C) 2014-2018 Broadcom */
   3
   4 #include <drm/drmP.h>
   5 #include <drm/drm_syncobj.h>
   6 #include <linux/module.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/pm_runtime.h>
   9 #include <linux/device.h>
  10 #include <linux/io.h>
  11 #include <linux/sched/signal.h>
  12
  13 #include "uapi/drm/v3d_drm.h"
  14 #include "v3d_drv.h"
  15 #include "v3d_regs.h"
  16 #include "v3d_trace.h"
  17
  18 static void
  19 v3d_init_core(struct v3d_dev *v3d, int core)
  20 {
  21         /* Set OVRTMUOUT, which means that the texture sampler uniform
  22          * configuration's tmu output type field is used, instead of
  23          * using the hardware default behavior based on the texture
  24          * type.  If you want the default behavior, you can still put
  25          * "2" in the indirect texture state's output_type field.
  26          */
  27         V3D_CORE_WRITE(core, V3D_CTL_MISCCFG, V3D_MISCCFG_OVRTMUOUT);
  28
  29         /* Whenever we flush the L2T cache, we always want to flush
  30          * the whole thing.
  31          */
  32         V3D_CORE_WRITE(core, V3D_CTL_L2TFLSTA, 0);
  33         V3D_CORE_WRITE(core, V3D_CTL_L2TFLEND, ~0);
  34 }
  35
  36 /* Sets invariant state for the HW. */
  37 static void
  38 v3d_init_hw_state(struct v3d_dev *v3d)
  39 {
  40         v3d_init_core(v3d, 0);
  41 }
  42
  43 static void
  44 v3d_idle_axi(struct v3d_dev *v3d, int core)
  45 {
  46         V3D_CORE_WRITE(core, V3D_GMP_CFG, V3D_GMP_CFG_STOP_REQ);
  47
  48         if (wait_for((V3D_CORE_READ(core, V3D_GMP_STATUS) &
  49                       (V3D_GMP_STATUS_RD_COUNT_MASK |
  50                        V3D_GMP_STATUS_WR_COUNT_MASK |
  51                        V3D_GMP_STATUS_CFG_BUSY)) == 0, 100)) {
  52                 DRM_ERROR("Failed to wait for safe GMP shutdown\n");
  53         }
  54 }
  55
  56 static void
  57 v3d_idle_gca(struct v3d_dev *v3d)
  58 {
  59         if (v3d->ver >= 41)
  60                 return;
  61
  62         V3D_GCA_WRITE(V3D_GCA_SAFE_SHUTDOWN, V3D_GCA_SAFE_SHUTDOWN_EN);
  63
  64         if (wait_for((V3D_GCA_READ(V3D_GCA_SAFE_SHUTDOWN_ACK) &
  65                       V3D_GCA_SAFE_SHUTDOWN_ACK_ACKED) ==
  66                      V3D_GCA_SAFE_SHUTDOWN_ACK_ACKED, 100)) {
  67                 DRM_ERROR("Failed to wait for safe GCA shutdown\n");
  68         }
  69 }
  70
  71 static void
  72 v3d_reset_v3d(struct v3d_dev *v3d)
  73 {
  74         int version = V3D_BRIDGE_READ(V3D_TOP_GR_BRIDGE_REVISION);
  75
  76         if (V3D_GET_FIELD(version, V3D_TOP_GR_BRIDGE_MAJOR) == 2) {
  77                 V3D_BRIDGE_WRITE(V3D_TOP_GR_BRIDGE_SW_INIT_0,
  78                                  V3D_TOP_GR_BRIDGE_SW_INIT_0_V3D_CLK_108_SW_INIT);
  79                 V3D_BRIDGE_WRITE(V3D_TOP_GR_BRIDGE_SW_INIT_0, 0);
  80
  81                 /* GFXH-1383: The SW_INIT may cause a stray write to address 0
  82                  * of the unit, so reset it to its power-on value here.
  83                  */
  84                 V3D_WRITE(V3D_HUB_AXICFG, V3D_HUB_AXICFG_MAX_LEN_MASK);
  85         } else {
  86                 WARN_ON_ONCE(V3D_GET_FIELD(version,
  87                                            V3D_TOP_GR_BRIDGE_MAJOR) != 7);
  88                 V3D_BRIDGE_WRITE(V3D_TOP_GR_BRIDGE_SW_INIT_1,
  89                                  V3D_TOP_GR_BRIDGE_SW_INIT_1_V3D_CLK_108_SW_INIT);
  90                 V3D_BRIDGE_WRITE(V3D_TOP_GR_BRIDGE_SW_INIT_1, 0);
  91         }
  92
  93         v3d_init_hw_state(v3d);
  94 }
  95
  96 void
  97 v3d_reset(struct v3d_dev *v3d)
  98 {
  99         struct drm_device *dev = &v3d->drm;
 100
 101         DRM_ERROR("Resetting GPU.\n");
 102         trace_v3d_reset_begin(dev);
 103
 104         /* XXX: only needed for safe powerdown, not reset. */
 105         if (false)
 106                 v3d_idle_axi(v3d, 0);
 107
 108         v3d_idle_gca(v3d);
 109         v3d_reset_v3d(v3d);
 110
 111         v3d_mmu_set_page_table(v3d);
 112         v3d_irq_reset(v3d);
 113
 114         trace_v3d_reset_end(dev);
 115 }
 116
 117 static void
 118 v3d_flush_l3(struct v3d_dev *v3d)
 119 {
 120         if (v3d->ver < 41) {
 121                 u32 gca_ctrl = V3D_GCA_READ(V3D_GCA_CACHE_CTRL);
 122
 123                 V3D_GCA_WRITE(V3D_GCA_CACHE_CTRL,
 124                               gca_ctrl | V3D_GCA_CACHE_CTRL_FLUSH);
 125
 126                 if (v3d->ver < 33) {
 127                         V3D_GCA_WRITE(V3D_GCA_CACHE_CTRL,
 128                                       gca_ctrl & ~V3D_GCA_CACHE_CTRL_FLUSH);
 129                 }
 130         }
 131 }
 132
 133 /* Invalidates the (read-only) L2 cache. */
 134 static void
 135 v3d_invalidate_l2(struct v3d_dev *v3d, int core)
 136 {
 137         V3D_CORE_WRITE(core, V3D_CTL_L2CACTL,
 138                        V3D_L2CACTL_L2CCLR |
 139                        V3D_L2CACTL_L2CENA);
 140 }
 141
 142 static void
 143 v3d_invalidate_l1td(struct v3d_dev *v3d, int core)
 144 {
 145         V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL, V3D_L2TCACTL_TMUWCF);
 146         if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) &
 147                        V3D_L2TCACTL_L2TFLS), 100)) {
 148                 DRM_ERROR("Timeout waiting for L1T write combiner flush\n");
 149         }
 150 }
 151
 152 /* Invalidates texture L2 cachelines */
 153 static void
 154 v3d_flush_l2t(struct v3d_dev *v3d, int core)
 155 {
 156         v3d_invalidate_l1td(v3d, core);
 157
 158         V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL,
 159                        V3D_L2TCACTL_L2TFLS |
 160                        V3D_SET_FIELD(V3D_L2TCACTL_FLM_FLUSH, V3D_L2TCACTL_FLM));
 161         if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) &
 162                        V3D_L2TCACTL_L2TFLS), 100)) {
 163                 DRM_ERROR("Timeout waiting for L2T flush\n");
 164         }
 165 }
 166
 167 /* Invalidates the slice caches.  These are read-only caches. */
 168 static void
 169 v3d_invalidate_slices(struct v3d_dev *v3d, int core)
 170 {
 171         V3D_CORE_WRITE(core, V3D_CTL_SLCACTL,
 172                        V3D_SET_FIELD(0xf, V3D_SLCACTL_TVCCS) |
 173                        V3D_SET_FIELD(0xf, V3D_SLCACTL_TDCCS) |
 174                        V3D_SET_FIELD(0xf, V3D_SLCACTL_UCC) |
 175                        V3D_SET_FIELD(0xf, V3D_SLCACTL_ICC));
 176 }
 177
 178 /* Invalidates texture L2 cachelines */
 179 static void
 180 v3d_invalidate_l2t(struct v3d_dev *v3d, int core)
 181 {
 182         V3D_CORE_WRITE(core,
 183                        V3D_CTL_L2TCACTL,
 184                        V3D_L2TCACTL_L2TFLS |
 185                        V3D_SET_FIELD(V3D_L2TCACTL_FLM_CLEAR, V3D_L2TCACTL_FLM));
 186         if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) &
 187                        V3D_L2TCACTL_L2TFLS), 100)) {
 188                 DRM_ERROR("Timeout waiting for L2T invalidate\n");
 189         }
 190 }
 191
 192 void
 193 v3d_invalidate_caches(struct v3d_dev *v3d)
 194 {
 195         v3d_flush_l3(v3d);
 196
 197         v3d_invalidate_l2(v3d, 0);
 198         v3d_invalidate_slices(v3d, 0);
 199         v3d_flush_l2t(v3d, 0);
 200 }
 201
 202 void
 203 v3d_flush_caches(struct v3d_dev *v3d)
 204 {
 205         v3d_invalidate_l1td(v3d, 0);
 206         v3d_invalidate_l2t(v3d, 0);
 207 }
 208
 209 static void
 210 v3d_attach_object_fences(struct v3d_exec_info *exec)
 211 {
 212         struct dma_fence *out_fence = exec->render_done_fence;
 213         struct v3d_bo *bo;
 214         int i;
 215
 216         for (i = 0; i < exec->bo_count; i++) {
 217                 bo = to_v3d_bo(&exec->bo[i]->base);
 218
 219                 /* XXX: Use shared fences for read-only objects. */
 220                 reservation_object_add_excl_fence(bo->resv, out_fence);
 221         }
 222 }
 223
 224 static void
 225 v3d_unlock_bo_reservations(struct drm_device *dev,
 226                            struct v3d_exec_info *exec,
 227                            struct ww_acquire_ctx *acquire_ctx)
 228 {
 229         int i;
 230
 231         for (i = 0; i < exec->bo_count; i++) {
 232                 struct v3d_bo *bo = to_v3d_bo(&exec->bo[i]->base);
 233
 234                 ww_mutex_unlock(&bo->resv->lock);
 235         }
 236
 237         ww_acquire_fini(acquire_ctx);
 238 }
 239
 240 /* Takes the reservation lock on all the BOs being referenced, so that
 241  * at queue submit time we can update the reservations.
 242  *
 243  * We don't lock the RCL the tile alloc/state BOs, or overflow memory
 244  * (all of which are on exec->unref_list).  They're entirely private
 245  * to v3d, so we don't attach dma-buf fences to them.
 246  */
 247 static int
 248 v3d_lock_bo_reservations(struct drm_device *dev,
 249                          struct v3d_exec_info *exec,
 250                          struct ww_acquire_ctx *acquire_ctx)
 251 {
 252         int contended_lock = -1;
 253         int i, ret;
 254         struct v3d_bo *bo;
 255
 256         ww_acquire_init(acquire_ctx, &reservation_ww_class);
 257
 258 retry:
 259         if (contended_lock != -1) {
 260                 bo = to_v3d_bo(&exec->bo[contended_lock]->base);
 261                 ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
 262                                                        acquire_ctx);
 263                 if (ret) {
 264                         ww_acquire_done(acquire_ctx);
 265                         return ret;
 266                 }
 267         }
 268
 269         for (i = 0; i < exec->bo_count; i++) {
 270                 if (i == contended_lock)
 271                         continue;
 272
 273                 bo = to_v3d_bo(&exec->bo[i]->base);
 274
 275                 ret = ww_mutex_lock_interruptible(&bo->resv->lock, acquire_ctx);
 276                 if (ret) {
 277                         int j;
 278
 279                         for (j = 0; j < i; j++) {
 280                                 bo = to_v3d_bo(&exec->bo[j]->base);
 281                                 ww_mutex_unlock(&bo->resv->lock);
 282                         }
 283
 284                         if (contended_lock != -1 && contended_lock >= i) {
 285                                 bo = to_v3d_bo(&exec->bo[contended_lock]->base);
 286
 287                                 ww_mutex_unlock(&bo->resv->lock);
 288                         }
 289
 290                         if (ret == -EDEADLK) {
 291                                 contended_lock = i;
 292                                 goto retry;
 293                         }
 294
 295                         ww_acquire_done(acquire_ctx);
 296                         return ret;
 297                 }
 298         }
 299
 300         ww_acquire_done(acquire_ctx);
 301
 302         /* Reserve space for our shared (read-only) fence references,
 303          * before we commit the CL to the hardware.
 304          */
 305         for (i = 0; i < exec->bo_count; i++) {
 306                 bo = to_v3d_bo(&exec->bo[i]->base);
 307
 308                 ret = reservation_object_reserve_shared(bo->resv);
 309                 if (ret) {
 310                         v3d_unlock_bo_reservations(dev, exec, acquire_ctx);
 311                         return ret;
 312                 }
 313         }
 314
 315         return 0;
 316 }
 317
 318 /**
 319  * v3d_cl_lookup_bos() - Sets up exec->bo[] with the GEM objects
 320  * referenced by the job.
 321  * @dev: DRM device
 322  * @file_priv: DRM file for this fd
 323  * @exec: V3D job being set up
 324  *
 325  * The command validator needs to reference BOs by their index within
 326  * the submitted job's BO list.  This does the validation of the job's
 327  * BO list and reference counting for the lifetime of the job.
 328  *
 329  * Note that this function doesn't need to unreference the BOs on
 330  * failure, because that will happen at v3d_exec_cleanup() time.
 331  */
 332 static int
 333 v3d_cl_lookup_bos(struct drm_device *dev,
 334                   struct drm_file *file_priv,
 335                   struct drm_v3d_submit_cl *args,
 336                   struct v3d_exec_info *exec)
 337 {
 338         u32 *handles;
 339         int ret = 0;
 340         int i;
 341
 342         exec->bo_count = args->bo_handle_count;
 343
 344         if (!exec->bo_count) {
 345                 /* See comment on bo_index for why we have to check
 346                  * this.
 347                  */
 348                 DRM_DEBUG("Rendering requires BOs\n");
 349                 return -EINVAL;
 350         }
 351
 352         exec->bo = kvmalloc_array(exec->bo_count,
 353                                   sizeof(struct drm_gem_cma_object *),
 354                                   GFP_KERNEL | __GFP_ZERO);
 355         if (!exec->bo) {
 356                 DRM_DEBUG("Failed to allocate validated BO pointers\n");
 357                 return -ENOMEM;
 358         }
 359
 360         handles = kvmalloc_array(exec->bo_count, sizeof(u32), GFP_KERNEL);
 361         if (!handles) {
 362                 ret = -ENOMEM;
 363                 DRM_DEBUG("Failed to allocate incoming GEM handles\n");
 364                 goto fail;
 365         }
 366
 367         if (copy_from_user(handles,
 368                            (void __user *)(uintptr_t)args->bo_handles,
 369                            exec->bo_count * sizeof(u32))) {
 370                 ret = -EFAULT;
 371                 DRM_DEBUG("Failed to copy in GEM handles\n");
 372                 goto fail;
 373         }
 374
 375         spin_lock(&file_priv->table_lock);
 376         for (i = 0; i < exec->bo_count; i++) {
 377                 struct drm_gem_object *bo = idr_find(&file_priv->object_idr,
 378                                                      handles[i]);
 379                 if (!bo) {
 380                         DRM_DEBUG("Failed to look up GEM BO %d: %d\n",
 381                                   i, handles[i]);
 382                         ret = -ENOENT;
 383                         spin_unlock(&file_priv->table_lock);
 384                         goto fail;
 385                 }
 386                 drm_gem_object_get(bo);
 387                 exec->bo[i] = to_v3d_bo(bo);
 388         }
 389         spin_unlock(&file_priv->table_lock);
 390
 391 fail:
 392         kvfree(handles);
 393         return ret;
 394 }
 395
 396 static void
 397 v3d_exec_cleanup(struct kref *ref)
 398 {
 399         struct v3d_exec_info *exec = container_of(ref, struct v3d_exec_info,
 400                                                   refcount);
 401         struct v3d_dev *v3d = exec->v3d;
 402         unsigned int i;
 403         struct v3d_bo *bo, *save;
 404
 405         dma_fence_put(exec->bin.in_fence);
 406         dma_fence_put(exec->render.in_fence);
 407
 408         dma_fence_put(exec->bin.done_fence);
 409         dma_fence_put(exec->render.done_fence);
 410
 411         dma_fence_put(exec->bin_done_fence);
 412         dma_fence_put(exec->render_done_fence);
 413
 414         for (i = 0; i < exec->bo_count; i++)
 415                 drm_gem_object_put_unlocked(&exec->bo[i]->base);
 416         kvfree(exec->bo);
 417
 418         list_for_each_entry_safe(bo, save, &exec->unref_list, unref_head) {
 419                 drm_gem_object_put_unlocked(&bo->base);
 420         }
 421
 422         pm_runtime_mark_last_busy(v3d->dev);
 423         pm_runtime_put_autosuspend(v3d->dev);
 424
 425         kfree(exec);
 426 }
 427
 428 void v3d_exec_put(struct v3d_exec_info *exec)
 429 {
 430         kref_put(&exec->refcount, v3d_exec_cleanup);
 431 }
 432
 433 int
 434 v3d_wait_bo_ioctl(struct drm_device *dev, void *data,
 435                   struct drm_file *file_priv)
 436 {
 437         int ret;
 438         struct drm_v3d_wait_bo *args = data;
 439         struct drm_gem_object *gem_obj;
 440         struct v3d_bo *bo;
 441         ktime_t start = ktime_get();
 442         u64 delta_ns;
 443         unsigned long timeout_jiffies =
 444                 nsecs_to_jiffies_timeout(args->timeout_ns);
 445
 446         if (args->pad != 0)
 447                 return -EINVAL;
 448
 449         gem_obj = drm_gem_object_lookup(file_priv, args->handle);
 450         if (!gem_obj) {
 451                 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
 452                 return -EINVAL;
 453         }
 454         bo = to_v3d_bo(gem_obj);
 455
 456         ret = reservation_object_wait_timeout_rcu(bo->resv,
 457                                                   true, true,
 458                                                   timeout_jiffies);
 459
 460         if (ret == 0)
 461                 ret = -ETIME;
 462         else if (ret > 0)
 463                 ret = 0;
 464
 465         /* Decrement the user's timeout, in case we got interrupted
 466          * such that the ioctl will be restarted.
 467          */
 468         delta_ns = ktime_to_ns(ktime_sub(ktime_get(), start));
 469         if (delta_ns < args->timeout_ns)
 470                 args->timeout_ns -= delta_ns;
 471         else
 472                 args->timeout_ns = 0;
 473
 474         /* Asked to wait beyond the jiffie/scheduler precision? */
 475         if (ret == -ETIME && args->timeout_ns)
 476                 ret = -EAGAIN;
 477
 478         drm_gem_object_put_unlocked(gem_obj);
 479
 480         return ret;
 481 }
 482
 483 /**
 484  * v3d_submit_cl_ioctl() - Submits a job (frame) to the V3D.
 485  * @dev: DRM device
 486  * @data: ioctl argument
 487  * @file_priv: DRM file for this fd
 488  *
 489  * This is the main entrypoint for userspace to submit a 3D frame to
 490  * the GPU.  Userspace provides the binner command list (if
 491  * applicable), and the kernel sets up the render command list to draw
 492  * to the framebuffer described in the ioctl, using the command lists
 493  * that the 3D engine's binner will produce.
 494  */
 495 int
 496 v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 497                     struct drm_file *file_priv)
 498 {
 499         struct v3d_dev *v3d = to_v3d_dev(dev);
 500         struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
 501         struct drm_v3d_submit_cl *args = data;
 502         struct v3d_exec_info *exec;
 503         struct ww_acquire_ctx acquire_ctx;
 504         struct drm_syncobj *sync_out;
 505         int ret = 0;
 506
 507         if (args->pad != 0) {
 508                 DRM_INFO("pad must be zero: %d\n", args->pad);
 509                 return -EINVAL;
 510         }
 511
 512         exec = kcalloc(1, sizeof(*exec), GFP_KERNEL);
 513         if (!exec)
 514                 return -ENOMEM;
 515
 516         ret = pm_runtime_get_sync(v3d->dev);
 517         if (ret < 0) {
 518                 kfree(exec);
 519                 return ret;
 520         }
 521
 522         kref_init(&exec->refcount);
 523
 524         ret = drm_syncobj_find_fence(file_priv, args->in_sync_bcl,
 525                                      0, &exec->bin.in_fence);
 526         if (ret == -EINVAL)
 527                 goto fail;
 528
 529         ret = drm_syncobj_find_fence(file_priv, args->in_sync_rcl,
 530                                      0, &exec->render.in_fence);
 531         if (ret == -EINVAL)
 532                 goto fail;
 533
 534         exec->qma = args->qma;
 535         exec->qms = args->qms;
 536         exec->qts = args->qts;
 537         exec->bin.exec = exec;
 538         exec->bin.start = args->bcl_start;
 539         exec->bin.end = args->bcl_end;
 540         exec->render.exec = exec;
 541         exec->render.start = args->rcl_start;
 542         exec->render.end = args->rcl_end;
 543         exec->v3d = v3d;
 544         INIT_LIST_HEAD(&exec->unref_list);
 545
 546         ret = v3d_cl_lookup_bos(dev, file_priv, args, exec);
 547         if (ret)
 548                 goto fail;
 549
 550         ret = v3d_lock_bo_reservations(dev, exec, &acquire_ctx);
 551         if (ret)
 552                 goto fail;
 553
 554         mutex_lock(&v3d->sched_lock);
 555         if (exec->bin.start != exec->bin.end) {
 556                 ret = drm_sched_job_init(&exec->bin.base,
 557                                          &v3d_priv->sched_entity[V3D_BIN],
 558                                          v3d_priv);
 559                 if (ret)
 560                         goto fail_unreserve;
 561
 562                 exec->bin_done_fence =
 563                         dma_fence_get(&exec->bin.base.s_fence->finished);
 564
 565                 kref_get(&exec->refcount); /* put by scheduler job completion */
 566                 drm_sched_entity_push_job(&exec->bin.base,
 567                                           &v3d_priv->sched_entity[V3D_BIN]);
 568         }
 569
 570         ret = drm_sched_job_init(&exec->render.base,
 571                                  &v3d_priv->sched_entity[V3D_RENDER],
 572                                  v3d_priv);
 573         if (ret)
 574                 goto fail_unreserve;
 575
 576         exec->render_done_fence =
 577                 dma_fence_get(&exec->render.base.s_fence->finished);
 578
 579         kref_get(&exec->refcount); /* put by scheduler job completion */
 580         drm_sched_entity_push_job(&exec->render.base,
 581                                   &v3d_priv->sched_entity[V3D_RENDER]);
 582         mutex_unlock(&v3d->sched_lock);
 583
 584         v3d_attach_object_fences(exec);
 585
 586         v3d_unlock_bo_reservations(dev, exec, &acquire_ctx);
 587
 588         /* Update the return sync object for the */
 589         sync_out = drm_syncobj_find(file_priv, args->out_sync);
 590         if (sync_out) {
 591                 drm_syncobj_replace_fence(sync_out, 0,
 592                                           exec->render_done_fence);
 593                 drm_syncobj_put(sync_out);
 594         }
 595
 596         v3d_exec_put(exec);
 597
 598         return 0;
 599
 600 fail_unreserve:
 601         mutex_unlock(&v3d->sched_lock);
 602         v3d_unlock_bo_reservations(dev, exec, &acquire_ctx);
 603 fail:
 604         v3d_exec_put(exec);
 605
 606         return ret;
 607 }
 608
 609 int
 610 v3d_gem_init(struct drm_device *dev)
 611 {
 612         struct v3d_dev *v3d = to_v3d_dev(dev);
 613         u32 pt_size = 4096 * 1024;
 614         int ret, i;
 615
 616         for (i = 0; i < V3D_MAX_QUEUES; i++)
 617                 v3d->queue[i].fence_context = dma_fence_context_alloc(1);
 618
 619         spin_lock_init(&v3d->mm_lock);
 620         spin_lock_init(&v3d->job_lock);
 621         mutex_init(&v3d->bo_lock);
 622         mutex_init(&v3d->reset_lock);
 623         mutex_init(&v3d->sched_lock);
 624
 625         /* Note: We don't allocate address 0.  Various bits of HW
 626          * treat 0 as special, such as the occlusion query counters
 627          * where 0 means "disabled".
 628          */
 629         drm_mm_init(&v3d->mm, 1, pt_size / sizeof(u32) - 1);
 630
 631         v3d->pt = dma_alloc_wc(v3d->dev, pt_size,
 632                                &v3d->pt_paddr,
 633                                GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 634         if (!v3d->pt) {
 635                 drm_mm_takedown(&v3d->mm);
 636                 dev_err(v3d->dev,
 637                         "Failed to allocate page tables. "
 638                         "Please ensure you have CMA enabled.\n");
 639                 return -ENOMEM;
 640         }
 641
 642         v3d_init_hw_state(v3d);
 643         v3d_mmu_set_page_table(v3d);
 644
 645         ret = v3d_sched_init(v3d);
 646         if (ret) {
 647                 drm_mm_takedown(&v3d->mm);
 648                 dma_free_coherent(v3d->dev, 4096 * 1024, (void *)v3d->pt,
 649                                   v3d->pt_paddr);
 650         }
 651
 652         return 0;
 653 }
 654
 655 void
 656 v3d_gem_destroy(struct drm_device *dev)
 657 {
 658         struct v3d_dev *v3d = to_v3d_dev(dev);
 659
 660         v3d_sched_fini(v3d);
 661
 662         /* Waiting for exec to finish would need to be done before
 663          * unregistering V3D.
 664          */
 665         WARN_ON(v3d->bin_job);
 666         WARN_ON(v3d->render_job);
 667
 668         drm_mm_takedown(&v3d->mm);
 669
 670         dma_free_coherent(v3d->dev, 4096 * 1024, (void *)v3d->pt, v3d->pt_paddr);
 671 }