drivers/gpu/drm/vc4/vc4_gem.c

   1 /*
   2  * Copyright © 2014 Broadcom
   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 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/device.h>
  28 #include <linux/io.h>
  29 #include <linux/sched/signal.h>
  30
  31 #include "uapi/drm/vc4_drm.h"
  32 #include "vc4_drv.h"
  33 #include "vc4_regs.h"
  34 #include "vc4_trace.h"
  35
  36 static void
  37 vc4_queue_hangcheck(struct drm_device *dev)
  38 {
  39         struct vc4_dev *vc4 = to_vc4_dev(dev);
  40
  41         mod_timer(&vc4->hangcheck.timer,
  42                   round_jiffies_up(jiffies + msecs_to_jiffies(100)));
  43 }
  44
  45 struct vc4_hang_state {
  46         struct drm_vc4_get_hang_state user_state;
  47
  48         u32 bo_count;
  49         struct drm_gem_object **bo;
  50 };
  51
  52 static void
  53 vc4_free_hang_state(struct drm_device *dev, struct vc4_hang_state *state)
  54 {
  55         unsigned int i;
  56
  57         for (i = 0; i < state->user_state.bo_count; i++)
  58                 drm_gem_object_put_unlocked(state->bo[i]);
  59
  60         kfree(state);
  61 }
  62
  63 int
  64 vc4_get_hang_state_ioctl(struct drm_device *dev, void *data,
  65                          struct drm_file *file_priv)
  66 {
  67         struct drm_vc4_get_hang_state *get_state = data;
  68         struct drm_vc4_get_hang_state_bo *bo_state;
  69         struct vc4_hang_state *kernel_state;
  70         struct drm_vc4_get_hang_state *state;
  71         struct vc4_dev *vc4 = to_vc4_dev(dev);
  72         unsigned long irqflags;
  73         u32 i;
  74         int ret = 0;
  75
  76         spin_lock_irqsave(&vc4->job_lock, irqflags);
  77         kernel_state = vc4->hang_state;
  78         if (!kernel_state) {
  79                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
  80                 return -ENOENT;
  81         }
  82         state = &kernel_state->user_state;
  83
  84         /* If the user's array isn't big enough, just return the
  85          * required array size.
  86          */
  87         if (get_state->bo_count < state->bo_count) {
  88                 get_state->bo_count = state->bo_count;
  89                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
  90                 return 0;
  91         }
  92
  93         vc4->hang_state = NULL;
  94         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
  95
  96         /* Save the user's BO pointer, so we don't stomp it with the memcpy. */
  97         state->bo = get_state->bo;
  98         memcpy(get_state, state, sizeof(*state));
  99
 100         bo_state = kcalloc(state->bo_count, sizeof(*bo_state), GFP_KERNEL);
 101         if (!bo_state) {
 102                 ret = -ENOMEM;
 103                 goto err_free;
 104         }
 105
 106         for (i = 0; i < state->bo_count; i++) {
 107                 struct vc4_bo *vc4_bo = to_vc4_bo(kernel_state->bo[i]);
 108                 u32 handle;
 109
 110                 ret = drm_gem_handle_create(file_priv, kernel_state->bo[i],
 111                                             &handle);
 112
 113                 if (ret) {
 114                         state->bo_count = i;
 115                         goto err_delete_handle;
 116                 }
 117                 bo_state[i].handle = handle;
 118                 bo_state[i].paddr = vc4_bo->base.paddr;
 119                 bo_state[i].size = vc4_bo->base.base.size;
 120         }
 121
 122         if (copy_to_user(u64_to_user_ptr(get_state->bo),
 123                          bo_state,
 124                          state->bo_count * sizeof(*bo_state)))
 125                 ret = -EFAULT;
 126
 127 err_delete_handle:
 128         if (ret) {
 129                 for (i = 0; i < state->bo_count; i++)
 130                         drm_gem_handle_delete(file_priv, bo_state[i].handle);
 131         }
 132
 133 err_free:
 134         vc4_free_hang_state(dev, kernel_state);
 135         kfree(bo_state);
 136
 137         return ret;
 138 }
 139
 140 static void
 141 vc4_save_hang_state(struct drm_device *dev)
 142 {
 143         struct vc4_dev *vc4 = to_vc4_dev(dev);
 144         struct drm_vc4_get_hang_state *state;
 145         struct vc4_hang_state *kernel_state;
 146         struct vc4_exec_info *exec[2];
 147         struct vc4_bo *bo;
 148         unsigned long irqflags;
 149         unsigned int i, j, unref_list_count, prev_idx;
 150
 151         kernel_state = kcalloc(1, sizeof(*kernel_state), GFP_KERNEL);
 152         if (!kernel_state)
 153                 return;
 154
 155         state = &kernel_state->user_state;
 156
 157         spin_lock_irqsave(&vc4->job_lock, irqflags);
 158         exec[0] = vc4_first_bin_job(vc4);
 159         exec[1] = vc4_first_render_job(vc4);
 160         if (!exec[0] && !exec[1]) {
 161                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 162                 return;
 163         }
 164
 165         /* Get the bos from both binner and renderer into hang state. */
 166         state->bo_count = 0;
 167         for (i = 0; i < 2; i++) {
 168                 if (!exec[i])
 169                         continue;
 170
 171                 unref_list_count = 0;
 172                 list_for_each_entry(bo, &exec[i]->unref_list, unref_head)
 173                         unref_list_count++;
 174                 state->bo_count += exec[i]->bo_count + unref_list_count;
 175         }
 176
 177         kernel_state->bo = kcalloc(state->bo_count,
 178                                    sizeof(*kernel_state->bo), GFP_ATOMIC);
 179
 180         if (!kernel_state->bo) {
 181                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 182                 return;
 183         }
 184
 185         prev_idx = 0;
 186         for (i = 0; i < 2; i++) {
 187                 if (!exec[i])
 188                         continue;
 189
 190                 for (j = 0; j < exec[i]->bo_count; j++) {
 191                         bo = to_vc4_bo(&exec[i]->bo[j]->base);
 192
 193                         /* Retain BOs just in case they were marked purgeable.
 194                          * This prevents the BO from being purged before
 195                          * someone had a chance to dump the hang state.
 196                          */
 197                         WARN_ON(!refcount_read(&bo->usecnt));
 198                         refcount_inc(&bo->usecnt);
 199                         drm_gem_object_get(&exec[i]->bo[j]->base);
 200                         kernel_state->bo[j + prev_idx] = &exec[i]->bo[j]->base;
 201                 }
 202
 203                 list_for_each_entry(bo, &exec[i]->unref_list, unref_head) {
 204                         /* No need to retain BOs coming from the ->unref_list
 205                          * because they are naturally unpurgeable.
 206                          */
 207                         drm_gem_object_get(&bo->base.base);
 208                         kernel_state->bo[j + prev_idx] = &bo->base.base;
 209                         j++;
 210                 }
 211                 prev_idx = j + 1;
 212         }
 213
 214         if (exec[0])
 215                 state->start_bin = exec[0]->ct0ca;
 216         if (exec[1])
 217                 state->start_render = exec[1]->ct1ca;
 218
 219         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 220
 221         state->ct0ca = V3D_READ(V3D_CTNCA(0));
 222         state->ct0ea = V3D_READ(V3D_CTNEA(0));
 223
 224         state->ct1ca = V3D_READ(V3D_CTNCA(1));
 225         state->ct1ea = V3D_READ(V3D_CTNEA(1));
 226
 227         state->ct0cs = V3D_READ(V3D_CTNCS(0));
 228         state->ct1cs = V3D_READ(V3D_CTNCS(1));
 229
 230         state->ct0ra0 = V3D_READ(V3D_CT00RA0);
 231         state->ct1ra0 = V3D_READ(V3D_CT01RA0);
 232
 233         state->bpca = V3D_READ(V3D_BPCA);
 234         state->bpcs = V3D_READ(V3D_BPCS);
 235         state->bpoa = V3D_READ(V3D_BPOA);
 236         state->bpos = V3D_READ(V3D_BPOS);
 237
 238         state->vpmbase = V3D_READ(V3D_VPMBASE);
 239
 240         state->dbge = V3D_READ(V3D_DBGE);
 241         state->fdbgo = V3D_READ(V3D_FDBGO);
 242         state->fdbgb = V3D_READ(V3D_FDBGB);
 243         state->fdbgr = V3D_READ(V3D_FDBGR);
 244         state->fdbgs = V3D_READ(V3D_FDBGS);
 245         state->errstat = V3D_READ(V3D_ERRSTAT);
 246
 247         /* We need to turn purgeable BOs into unpurgeable ones so that
 248          * userspace has a chance to dump the hang state before the kernel
 249          * decides to purge those BOs.
 250          * Note that BO consistency at dump time cannot be guaranteed. For
 251          * example, if the owner of these BOs decides to re-use them or mark
 252          * them purgeable again there's nothing we can do to prevent it.
 253          */
 254         for (i = 0; i < kernel_state->user_state.bo_count; i++) {
 255                 struct vc4_bo *bo = to_vc4_bo(kernel_state->bo[i]);
 256
 257                 if (bo->madv == __VC4_MADV_NOTSUPP)
 258                         continue;
 259
 260                 mutex_lock(&bo->madv_lock);
 261                 if (!WARN_ON(bo->madv == __VC4_MADV_PURGED))
 262                         bo->madv = VC4_MADV_WILLNEED;
 263                 refcount_dec(&bo->usecnt);
 264                 mutex_unlock(&bo->madv_lock);
 265         }
 266
 267         spin_lock_irqsave(&vc4->job_lock, irqflags);
 268         if (vc4->hang_state) {
 269                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 270                 vc4_free_hang_state(dev, kernel_state);
 271         } else {
 272                 vc4->hang_state = kernel_state;
 273                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 274         }
 275 }
 276
 277 static void
 278 vc4_reset(struct drm_device *dev)
 279 {
 280         struct vc4_dev *vc4 = to_vc4_dev(dev);
 281
 282         DRM_INFO("Resetting GPU.\n");
 283
 284         mutex_lock(&vc4->power_lock);
 285         if (vc4->power_refcount) {
 286                 /* Power the device off and back on the by dropping the
 287                  * reference on runtime PM.
 288                  */
 289                 pm_runtime_put_sync_suspend(&vc4->v3d->pdev->dev);
 290                 pm_runtime_get_sync(&vc4->v3d->pdev->dev);
 291         }
 292         mutex_unlock(&vc4->power_lock);
 293
 294         vc4_irq_reset(dev);
 295
 296         /* Rearm the hangcheck -- another job might have been waiting
 297          * for our hung one to get kicked off, and vc4_irq_reset()
 298          * would have started it.
 299          */
 300         vc4_queue_hangcheck(dev);
 301 }
 302
 303 static void
 304 vc4_reset_work(struct work_struct *work)
 305 {
 306         struct vc4_dev *vc4 =
 307                 container_of(work, struct vc4_dev, hangcheck.reset_work);
 308
 309         vc4_save_hang_state(vc4->dev);
 310
 311         vc4_reset(vc4->dev);
 312 }
 313
 314 static void
 315 vc4_hangcheck_elapsed(struct timer_list *t)
 316 {
 317         struct vc4_dev *vc4 = from_timer(vc4, t, hangcheck.timer);
 318         struct drm_device *dev = vc4->dev;
 319         uint32_t ct0ca, ct1ca;
 320         unsigned long irqflags;
 321         struct vc4_exec_info *bin_exec, *render_exec;
 322
 323         spin_lock_irqsave(&vc4->job_lock, irqflags);
 324
 325         bin_exec = vc4_first_bin_job(vc4);
 326         render_exec = vc4_first_render_job(vc4);
 327
 328         /* If idle, we can stop watching for hangs. */
 329         if (!bin_exec && !render_exec) {
 330                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 331                 return;
 332         }
 333
 334         ct0ca = V3D_READ(V3D_CTNCA(0));
 335         ct1ca = V3D_READ(V3D_CTNCA(1));
 336
 337         /* If we've made any progress in execution, rearm the timer
 338          * and wait.
 339          */
 340         if ((bin_exec && ct0ca != bin_exec->last_ct0ca) ||
 341             (render_exec && ct1ca != render_exec->last_ct1ca)) {
 342                 if (bin_exec)
 343                         bin_exec->last_ct0ca = ct0ca;
 344                 if (render_exec)
 345                         render_exec->last_ct1ca = ct1ca;
 346                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 347                 vc4_queue_hangcheck(dev);
 348                 return;
 349         }
 350
 351         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 352
 353         /* We've gone too long with no progress, reset.  This has to
 354          * be done from a work struct, since resetting can sleep and
 355          * this timer hook isn't allowed to.
 356          */
 357         schedule_work(&vc4->hangcheck.reset_work);
 358 }
 359
 360 static void
 361 submit_cl(struct drm_device *dev, uint32_t thread, uint32_t start, uint32_t end)
 362 {
 363         struct vc4_dev *vc4 = to_vc4_dev(dev);
 364
 365         /* Set the current and end address of the control list.
 366          * Writing the end register is what starts the job.
 367          */
 368         V3D_WRITE(V3D_CTNCA(thread), start);
 369         V3D_WRITE(V3D_CTNEA(thread), end);
 370 }
 371
 372 int
 373 vc4_wait_for_seqno(struct drm_device *dev, uint64_t seqno, uint64_t timeout_ns,
 374                    bool interruptible)
 375 {
 376         struct vc4_dev *vc4 = to_vc4_dev(dev);
 377         int ret = 0;
 378         unsigned long timeout_expire;
 379         DEFINE_WAIT(wait);
 380
 381         if (vc4->finished_seqno >= seqno)
 382                 return 0;
 383
 384         if (timeout_ns == 0)
 385                 return -ETIME;
 386
 387         timeout_expire = jiffies + nsecs_to_jiffies(timeout_ns);
 388
 389         trace_vc4_wait_for_seqno_begin(dev, seqno, timeout_ns);
 390         for (;;) {
 391                 prepare_to_wait(&vc4->job_wait_queue, &wait,
 392                                 interruptible ? TASK_INTERRUPTIBLE :
 393                                 TASK_UNINTERRUPTIBLE);
 394
 395                 if (interruptible && signal_pending(current)) {
 396                         ret = -ERESTARTSYS;
 397                         break;
 398                 }
 399
 400                 if (vc4->finished_seqno >= seqno)
 401                         break;
 402
 403                 if (timeout_ns != ~0ull) {
 404                         if (time_after_eq(jiffies, timeout_expire)) {
 405                                 ret = -ETIME;
 406                                 break;
 407                         }
 408                         schedule_timeout(timeout_expire - jiffies);
 409                 } else {
 410                         schedule();
 411                 }
 412         }
 413
 414         finish_wait(&vc4->job_wait_queue, &wait);
 415         trace_vc4_wait_for_seqno_end(dev, seqno);
 416
 417         return ret;
 418 }
 419
 420 static void
 421 vc4_flush_caches(struct drm_device *dev)
 422 {
 423         struct vc4_dev *vc4 = to_vc4_dev(dev);
 424
 425         /* Flush the GPU L2 caches.  These caches sit on top of system
 426          * L3 (the 128kb or so shared with the CPU), and are
 427          * non-allocating in the L3.
 428          */
 429         V3D_WRITE(V3D_L2CACTL,
 430                   V3D_L2CACTL_L2CCLR);
 431
 432         V3D_WRITE(V3D_SLCACTL,
 433                   VC4_SET_FIELD(0xf, V3D_SLCACTL_T1CC) |
 434                   VC4_SET_FIELD(0xf, V3D_SLCACTL_T0CC) |
 435                   VC4_SET_FIELD(0xf, V3D_SLCACTL_UCC) |
 436                   VC4_SET_FIELD(0xf, V3D_SLCACTL_ICC));
 437 }
 438
 439 /* Sets the registers for the next job to be actually be executed in
 440  * the hardware.
 441  *
 442  * The job_lock should be held during this.
 443  */
 444 void
 445 vc4_submit_next_bin_job(struct drm_device *dev)
 446 {
 447         struct vc4_dev *vc4 = to_vc4_dev(dev);
 448         struct vc4_exec_info *exec;
 449
 450 again:
 451         exec = vc4_first_bin_job(vc4);
 452         if (!exec)
 453                 return;
 454
 455         vc4_flush_caches(dev);
 456
 457         /* Either put the job in the binner if it uses the binner, or
 458          * immediately move it to the to-be-rendered queue.
 459          */
 460         if (exec->ct0ca != exec->ct0ea) {
 461                 submit_cl(dev, 0, exec->ct0ca, exec->ct0ea);
 462         } else {
 463                 vc4_move_job_to_render(dev, exec);
 464                 goto again;
 465         }
 466 }
 467
 468 void
 469 vc4_submit_next_render_job(struct drm_device *dev)
 470 {
 471         struct vc4_dev *vc4 = to_vc4_dev(dev);
 472         struct vc4_exec_info *exec = vc4_first_render_job(vc4);
 473
 474         if (!exec)
 475                 return;
 476
 477         submit_cl(dev, 1, exec->ct1ca, exec->ct1ea);
 478 }
 479
 480 void
 481 vc4_move_job_to_render(struct drm_device *dev, struct vc4_exec_info *exec)
 482 {
 483         struct vc4_dev *vc4 = to_vc4_dev(dev);
 484         bool was_empty = list_empty(&vc4->render_job_list);
 485
 486         list_move_tail(&exec->head, &vc4->render_job_list);
 487         if (was_empty)
 488                 vc4_submit_next_render_job(dev);
 489 }
 490
 491 static void
 492 vc4_update_bo_seqnos(struct vc4_exec_info *exec, uint64_t seqno)
 493 {
 494         struct vc4_bo *bo;
 495         unsigned i;
 496
 497         for (i = 0; i < exec->bo_count; i++) {
 498                 bo = to_vc4_bo(&exec->bo[i]->base);
 499                 bo->seqno = seqno;
 500
 501                 reservation_object_add_shared_fence(bo->resv, exec->fence);
 502         }
 503
 504         list_for_each_entry(bo, &exec->unref_list, unref_head) {
 505                 bo->seqno = seqno;
 506         }
 507
 508         for (i = 0; i < exec->rcl_write_bo_count; i++) {
 509                 bo = to_vc4_bo(&exec->rcl_write_bo[i]->base);
 510                 bo->write_seqno = seqno;
 511
 512                 reservation_object_add_excl_fence(bo->resv, exec->fence);
 513         }
 514 }
 515
 516 static void
 517 vc4_unlock_bo_reservations(struct drm_device *dev,
 518                            struct vc4_exec_info *exec,
 519                            struct ww_acquire_ctx *acquire_ctx)
 520 {
 521         int i;
 522
 523         for (i = 0; i < exec->bo_count; i++) {
 524                 struct vc4_bo *bo = to_vc4_bo(&exec->bo[i]->base);
 525
 526                 ww_mutex_unlock(&bo->resv->lock);
 527         }
 528
 529         ww_acquire_fini(acquire_ctx);
 530 }
 531
 532 /* Takes the reservation lock on all the BOs being referenced, so that
 533  * at queue submit time we can update the reservations.
 534  *
 535  * We don't lock the RCL the tile alloc/state BOs, or overflow memory
 536  * (all of which are on exec->unref_list).  They're entirely private
 537  * to vc4, so we don't attach dma-buf fences to them.
 538  */
 539 static int
 540 vc4_lock_bo_reservations(struct drm_device *dev,
 541                          struct vc4_exec_info *exec,
 542                          struct ww_acquire_ctx *acquire_ctx)
 543 {
 544         int contended_lock = -1;
 545         int i, ret;
 546         struct vc4_bo *bo;
 547
 548         ww_acquire_init(acquire_ctx, &reservation_ww_class);
 549
 550 retry:
 551         if (contended_lock != -1) {
 552                 bo = to_vc4_bo(&exec->bo[contended_lock]->base);
 553                 ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
 554                                                        acquire_ctx);
 555                 if (ret) {
 556                         ww_acquire_done(acquire_ctx);
 557                         return ret;
 558                 }
 559         }
 560
 561         for (i = 0; i < exec->bo_count; i++) {
 562                 if (i == contended_lock)
 563                         continue;
 564
 565                 bo = to_vc4_bo(&exec->bo[i]->base);
 566
 567                 ret = ww_mutex_lock_interruptible(&bo->resv->lock, acquire_ctx);
 568                 if (ret) {
 569                         int j;
 570
 571                         for (j = 0; j < i; j++) {
 572                                 bo = to_vc4_bo(&exec->bo[j]->base);
 573                                 ww_mutex_unlock(&bo->resv->lock);
 574                         }
 575
 576                         if (contended_lock != -1 && contended_lock >= i) {
 577                                 bo = to_vc4_bo(&exec->bo[contended_lock]->base);
 578
 579                                 ww_mutex_unlock(&bo->resv->lock);
 580                         }
 581
 582                         if (ret == -EDEADLK) {
 583                                 contended_lock = i;
 584                                 goto retry;
 585                         }
 586
 587                         ww_acquire_done(acquire_ctx);
 588                         return ret;
 589                 }
 590         }
 591
 592         ww_acquire_done(acquire_ctx);
 593
 594         /* Reserve space for our shared (read-only) fence references,
 595          * before we commit the CL to the hardware.
 596          */
 597         for (i = 0; i < exec->bo_count; i++) {
 598                 bo = to_vc4_bo(&exec->bo[i]->base);
 599
 600                 ret = reservation_object_reserve_shared(bo->resv);
 601                 if (ret) {
 602                         vc4_unlock_bo_reservations(dev, exec, acquire_ctx);
 603                         return ret;
 604                 }
 605         }
 606
 607         return 0;
 608 }
 609
 610 /* Queues a struct vc4_exec_info for execution.  If no job is
 611  * currently executing, then submits it.
 612  *
 613  * Unlike most GPUs, our hardware only handles one command list at a
 614  * time.  To queue multiple jobs at once, we'd need to edit the
 615  * previous command list to have a jump to the new one at the end, and
 616  * then bump the end address.  That's a change for a later date,
 617  * though.
 618  */
 619 static int
 620 vc4_queue_submit(struct drm_device *dev, struct vc4_exec_info *exec,
 621                  struct ww_acquire_ctx *acquire_ctx)
 622 {
 623         struct vc4_dev *vc4 = to_vc4_dev(dev);
 624         uint64_t seqno;
 625         unsigned long irqflags;
 626         struct vc4_fence *fence;
 627
 628         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 629         if (!fence)
 630                 return -ENOMEM;
 631         fence->dev = dev;
 632
 633         spin_lock_irqsave(&vc4->job_lock, irqflags);
 634
 635         seqno = ++vc4->emit_seqno;
 636         exec->seqno = seqno;
 637
 638         dma_fence_init(&fence->base, &vc4_fence_ops, &vc4->job_lock,
 639                        vc4->dma_fence_context, exec->seqno);
 640         fence->seqno = exec->seqno;
 641         exec->fence = &fence->base;
 642
 643         vc4_update_bo_seqnos(exec, seqno);
 644
 645         vc4_unlock_bo_reservations(dev, exec, acquire_ctx);
 646
 647         list_add_tail(&exec->head, &vc4->bin_job_list);
 648
 649         /* If no job was executing, kick ours off.  Otherwise, it'll
 650          * get started when the previous job's flush done interrupt
 651          * occurs.
 652          */
 653         if (vc4_first_bin_job(vc4) == exec) {
 654                 vc4_submit_next_bin_job(dev);
 655                 vc4_queue_hangcheck(dev);
 656         }
 657
 658         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 659
 660         return 0;
 661 }
 662
 663 /**
 664  * vc4_cl_lookup_bos() - Sets up exec->bo[] with the GEM objects
 665  * referenced by the job.
 666  * @dev: DRM device
 667  * @file_priv: DRM file for this fd
 668  * @exec: V3D job being set up
 669  *
 670  * The command validator needs to reference BOs by their index within
 671  * the submitted job's BO list.  This does the validation of the job's
 672  * BO list and reference counting for the lifetime of the job.
 673  */
 674 static int
 675 vc4_cl_lookup_bos(struct drm_device *dev,
 676                   struct drm_file *file_priv,
 677                   struct vc4_exec_info *exec)
 678 {
 679         struct drm_vc4_submit_cl *args = exec->args;
 680         uint32_t *handles;
 681         int ret = 0;
 682         int i;
 683
 684         exec->bo_count = args->bo_handle_count;
 685
 686         if (!exec->bo_count) {
 687                 /* See comment on bo_index for why we have to check
 688                  * this.
 689                  */
 690                 DRM_DEBUG("Rendering requires BOs to validate\n");
 691                 return -EINVAL;
 692         }
 693
 694         exec->bo = kvmalloc_array(exec->bo_count,
 695                                     sizeof(struct drm_gem_cma_object *),
 696                                     GFP_KERNEL | __GFP_ZERO);
 697         if (!exec->bo) {
 698                 DRM_ERROR("Failed to allocate validated BO pointers\n");
 699                 return -ENOMEM;
 700         }
 701
 702         handles = kvmalloc_array(exec->bo_count, sizeof(uint32_t), GFP_KERNEL);
 703         if (!handles) {
 704                 ret = -ENOMEM;
 705                 DRM_ERROR("Failed to allocate incoming GEM handles\n");
 706                 goto fail;
 707         }
 708
 709         if (copy_from_user(handles, u64_to_user_ptr(args->bo_handles),
 710                            exec->bo_count * sizeof(uint32_t))) {
 711                 ret = -EFAULT;
 712                 DRM_ERROR("Failed to copy in GEM handles\n");
 713                 goto fail;
 714         }
 715
 716         spin_lock(&file_priv->table_lock);
 717         for (i = 0; i < exec->bo_count; i++) {
 718                 struct drm_gem_object *bo = idr_find(&file_priv->object_idr,
 719                                                      handles[i]);
 720                 if (!bo) {
 721                         DRM_DEBUG("Failed to look up GEM BO %d: %d\n",
 722                                   i, handles[i]);
 723                         ret = -EINVAL;
 724                         break;
 725                 }
 726
 727                 drm_gem_object_get(bo);
 728                 exec->bo[i] = (struct drm_gem_cma_object *)bo;
 729         }
 730         spin_unlock(&file_priv->table_lock);
 731
 732         if (ret)
 733                 goto fail_put_bo;
 734
 735         for (i = 0; i < exec->bo_count; i++) {
 736                 ret = vc4_bo_inc_usecnt(to_vc4_bo(&exec->bo[i]->base));
 737                 if (ret)
 738                         goto fail_dec_usecnt;
 739         }
 740
 741         kvfree(handles);
 742         return 0;
 743
 744 fail_dec_usecnt:
 745         /* Decrease usecnt on acquired objects.
 746          * We cannot rely on  vc4_complete_exec() to release resources here,
 747          * because vc4_complete_exec() has no information about which BO has
 748          * had its ->usecnt incremented.
 749          * To make things easier we just free everything explicitly and set
 750          * exec->bo to NULL so that vc4_complete_exec() skips the 'BO release'
 751          * step.
 752          */
 753         for (i-- ; i >= 0; i--)
 754                 vc4_bo_dec_usecnt(to_vc4_bo(&exec->bo[i]->base));
 755
 756 fail_put_bo:
 757         /* Release any reference to acquired objects. */
 758         for (i = 0; i < exec->bo_count && exec->bo[i]; i++)
 759                 drm_gem_object_put_unlocked(&exec->bo[i]->base);
 760
 761 fail:
 762         kvfree(handles);
 763         kvfree(exec->bo);
 764         exec->bo = NULL;
 765         return ret;
 766 }
 767
 768 static int
 769 vc4_get_bcl(struct drm_device *dev, struct vc4_exec_info *exec)
 770 {
 771         struct drm_vc4_submit_cl *args = exec->args;
 772         void *temp = NULL;
 773         void *bin;
 774         int ret = 0;
 775         uint32_t bin_offset = 0;
 776         uint32_t shader_rec_offset = roundup(bin_offset + args->bin_cl_size,
 777                                              16);
 778         uint32_t uniforms_offset = shader_rec_offset + args->shader_rec_size;
 779         uint32_t exec_size = uniforms_offset + args->uniforms_size;
 780         uint32_t temp_size = exec_size + (sizeof(struct vc4_shader_state) *
 781                                           args->shader_rec_count);
 782         struct vc4_bo *bo;
 783
 784         if (shader_rec_offset < args->bin_cl_size ||
 785             uniforms_offset < shader_rec_offset ||
 786             exec_size < uniforms_offset ||
 787             args->shader_rec_count >= (UINT_MAX /
 788                                           sizeof(struct vc4_shader_state)) ||
 789             temp_size < exec_size) {
 790                 DRM_DEBUG("overflow in exec arguments\n");
 791                 ret = -EINVAL;
 792                 goto fail;
 793         }
 794
 795         /* Allocate space where we'll store the copied in user command lists
 796          * and shader records.
 797          *
 798          * We don't just copy directly into the BOs because we need to
 799          * read the contents back for validation, and I think the
 800          * bo->vaddr is uncached access.
 801          */
 802         temp = kvmalloc_array(temp_size, 1, GFP_KERNEL);
 803         if (!temp) {
 804                 DRM_ERROR("Failed to allocate storage for copying "
 805                           "in bin/render CLs.\n");
 806                 ret = -ENOMEM;
 807                 goto fail;
 808         }
 809         bin = temp + bin_offset;
 810         exec->shader_rec_u = temp + shader_rec_offset;
 811         exec->uniforms_u = temp + uniforms_offset;
 812         exec->shader_state = temp + exec_size;
 813         exec->shader_state_size = args->shader_rec_count;
 814
 815         if (copy_from_user(bin,
 816                            u64_to_user_ptr(args->bin_cl),
 817                            args->bin_cl_size)) {
 818                 ret = -EFAULT;
 819                 goto fail;
 820         }
 821
 822         if (copy_from_user(exec->shader_rec_u,
 823                            u64_to_user_ptr(args->shader_rec),
 824                            args->shader_rec_size)) {
 825                 ret = -EFAULT;
 826                 goto fail;
 827         }
 828
 829         if (copy_from_user(exec->uniforms_u,
 830                            u64_to_user_ptr(args->uniforms),
 831                            args->uniforms_size)) {
 832                 ret = -EFAULT;
 833                 goto fail;
 834         }
 835
 836         bo = vc4_bo_create(dev, exec_size, true, VC4_BO_TYPE_BCL);
 837         if (IS_ERR(bo)) {
 838                 DRM_ERROR("Couldn't allocate BO for binning\n");
 839                 ret = PTR_ERR(bo);
 840                 goto fail;
 841         }
 842         exec->exec_bo = &bo->base;
 843
 844         list_add_tail(&to_vc4_bo(&exec->exec_bo->base)->unref_head,
 845                       &exec->unref_list);
 846
 847         exec->ct0ca = exec->exec_bo->paddr + bin_offset;
 848
 849         exec->bin_u = bin;
 850
 851         exec->shader_rec_v = exec->exec_bo->vaddr + shader_rec_offset;
 852         exec->shader_rec_p = exec->exec_bo->paddr + shader_rec_offset;
 853         exec->shader_rec_size = args->shader_rec_size;
 854
 855         exec->uniforms_v = exec->exec_bo->vaddr + uniforms_offset;
 856         exec->uniforms_p = exec->exec_bo->paddr + uniforms_offset;
 857         exec->uniforms_size = args->uniforms_size;
 858
 859         ret = vc4_validate_bin_cl(dev,
 860                                   exec->exec_bo->vaddr + bin_offset,
 861                                   bin,
 862                                   exec);
 863         if (ret)
 864                 goto fail;
 865
 866         ret = vc4_validate_shader_recs(dev, exec);
 867         if (ret)
 868                 goto fail;
 869
 870         /* Block waiting on any previous rendering into the CS's VBO,
 871          * IB, or textures, so that pixels are actually written by the
 872          * time we try to read them.
 873          */
 874         ret = vc4_wait_for_seqno(dev, exec->bin_dep_seqno, ~0ull, true);
 875
 876 fail:
 877         kvfree(temp);
 878         return ret;
 879 }
 880
 881 static void
 882 vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec)
 883 {
 884         struct vc4_dev *vc4 = to_vc4_dev(dev);
 885         unsigned long irqflags;
 886         unsigned i;
 887
 888         /* If we got force-completed because of GPU reset rather than
 889          * through our IRQ handler, signal the fence now.
 890          */
 891         if (exec->fence) {
 892                 dma_fence_signal(exec->fence);
 893                 dma_fence_put(exec->fence);
 894         }
 895
 896         if (exec->bo) {
 897                 for (i = 0; i < exec->bo_count; i++) {
 898                         struct vc4_bo *bo = to_vc4_bo(&exec->bo[i]->base);
 899
 900                         vc4_bo_dec_usecnt(bo);
 901                         drm_gem_object_put_unlocked(&exec->bo[i]->base);
 902                 }
 903                 kvfree(exec->bo);
 904         }
 905
 906         while (!list_empty(&exec->unref_list)) {
 907                 struct vc4_bo *bo = list_first_entry(&exec->unref_list,
 908                                                      struct vc4_bo, unref_head);
 909                 list_del(&bo->unref_head);
 910                 drm_gem_object_put_unlocked(&bo->base.base);
 911         }
 912
 913         /* Free up the allocation of any bin slots we used. */
 914         spin_lock_irqsave(&vc4->job_lock, irqflags);
 915         vc4->bin_alloc_used &= ~exec->bin_slots;
 916         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 917
 918         mutex_lock(&vc4->power_lock);
 919         if (--vc4->power_refcount == 0) {
 920                 pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
 921                 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
 922         }
 923         mutex_unlock(&vc4->power_lock);
 924
 925         kfree(exec);
 926 }
 927
 928 void
 929 vc4_job_handle_completed(struct vc4_dev *vc4)
 930 {
 931         unsigned long irqflags;
 932         struct vc4_seqno_cb *cb, *cb_temp;
 933
 934         spin_lock_irqsave(&vc4->job_lock, irqflags);
 935         while (!list_empty(&vc4->job_done_list)) {
 936                 struct vc4_exec_info *exec =
 937                         list_first_entry(&vc4->job_done_list,
 938                                          struct vc4_exec_info, head);
 939                 list_del(&exec->head);
 940
 941                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 942                 vc4_complete_exec(vc4->dev, exec);
 943                 spin_lock_irqsave(&vc4->job_lock, irqflags);
 944         }
 945
 946         list_for_each_entry_safe(cb, cb_temp, &vc4->seqno_cb_list, work.entry) {
 947                 if (cb->seqno <= vc4->finished_seqno) {
 948                         list_del_init(&cb->work.entry);
 949                         schedule_work(&cb->work);
 950                 }
 951         }
 952
 953         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 954 }
 955
 956 static void vc4_seqno_cb_work(struct work_struct *work)
 957 {
 958         struct vc4_seqno_cb *cb = container_of(work, struct vc4_seqno_cb, work);
 959
 960         cb->func(cb);
 961 }
 962
 963 int vc4_queue_seqno_cb(struct drm_device *dev,
 964                        struct vc4_seqno_cb *cb, uint64_t seqno,
 965                        void (*func)(struct vc4_seqno_cb *cb))
 966 {
 967         struct vc4_dev *vc4 = to_vc4_dev(dev);
 968         int ret = 0;
 969         unsigned long irqflags;
 970
 971         cb->func = func;
 972         INIT_WORK(&cb->work, vc4_seqno_cb_work);
 973
 974         spin_lock_irqsave(&vc4->job_lock, irqflags);
 975         if (seqno > vc4->finished_seqno) {
 976                 cb->seqno = seqno;
 977                 list_add_tail(&cb->work.entry, &vc4->seqno_cb_list);
 978         } else {
 979                 schedule_work(&cb->work);
 980         }
 981         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 982
 983         return ret;
 984 }
 985
 986 /* Scheduled when any job has been completed, this walks the list of
 987  * jobs that had completed and unrefs their BOs and frees their exec
 988  * structs.
 989  */
 990 static void
 991 vc4_job_done_work(struct work_struct *work)
 992 {
 993         struct vc4_dev *vc4 =
 994                 container_of(work, struct vc4_dev, job_done_work);
 995
 996         vc4_job_handle_completed(vc4);
 997 }
 998
 999 static int
1000 vc4_wait_for_seqno_ioctl_helper(struct drm_device *dev,
1001                                 uint64_t seqno,
1002                                 uint64_t *timeout_ns)
1003 {
1004         unsigned long start = jiffies;
1005         int ret = vc4_wait_for_seqno(dev, seqno, *timeout_ns, true);
1006
1007         if ((ret == -EINTR || ret == -ERESTARTSYS) && *timeout_ns != ~0ull) {
1008                 uint64_t delta = jiffies_to_nsecs(jiffies - start);
1009
1010                 if (*timeout_ns >= delta)
1011                         *timeout_ns -= delta;
1012         }
1013
1014         return ret;
1015 }
1016
1017 int
1018 vc4_wait_seqno_ioctl(struct drm_device *dev, void *data,
1019                      struct drm_file *file_priv)
1020 {
1021         struct drm_vc4_wait_seqno *args = data;
1022
1023         return vc4_wait_for_seqno_ioctl_helper(dev, args->seqno,
1024                                                &args->timeout_ns);
1025 }
1026
1027 int
1028 vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
1029                   struct drm_file *file_priv)
1030 {
1031         int ret;
1032         struct drm_vc4_wait_bo *args = data;
1033         struct drm_gem_object *gem_obj;
1034         struct vc4_bo *bo;
1035
1036         if (args->pad != 0)
1037                 return -EINVAL;
1038
1039         gem_obj = drm_gem_object_lookup(file_priv, args->handle);
1040         if (!gem_obj) {
1041                 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
1042                 return -EINVAL;
1043         }
1044         bo = to_vc4_bo(gem_obj);
1045
1046         ret = vc4_wait_for_seqno_ioctl_helper(dev, bo->seqno,
1047                                               &args->timeout_ns);
1048
1049         drm_gem_object_put_unlocked(gem_obj);
1050         return ret;
1051 }
1052
1053 /**
1054  * vc4_submit_cl_ioctl() - Submits a job (frame) to the VC4.
1055  * @dev: DRM device
1056  * @data: ioctl argument
1057  * @file_priv: DRM file for this fd
1058  *
1059  * This is the main entrypoint for userspace to submit a 3D frame to
1060  * the GPU.  Userspace provides the binner command list (if
1061  * applicable), and the kernel sets up the render command list to draw
1062  * to the framebuffer described in the ioctl, using the command lists
1063  * that the 3D engine's binner will produce.
1064  */
1065 int
1066 vc4_submit_cl_ioctl(struct drm_device *dev, void *data,
1067                     struct drm_file *file_priv)
1068 {
1069         struct vc4_dev *vc4 = to_vc4_dev(dev);
1070         struct drm_vc4_submit_cl *args = data;
1071         struct vc4_exec_info *exec;
1072         struct ww_acquire_ctx acquire_ctx;
1073         int ret = 0;
1074
1075         if ((args->flags & ~(VC4_SUBMIT_CL_USE_CLEAR_COLOR |
1076                              VC4_SUBMIT_CL_FIXED_RCL_ORDER |
1077                              VC4_SUBMIT_CL_RCL_ORDER_INCREASING_X |
1078                              VC4_SUBMIT_CL_RCL_ORDER_INCREASING_Y)) != 0) {
1079                 DRM_DEBUG("Unknown flags: 0x%02x\n", args->flags);
1080                 return -EINVAL;
1081         }
1082
1083         exec = kcalloc(1, sizeof(*exec), GFP_KERNEL);
1084         if (!exec) {
1085                 DRM_ERROR("malloc failure on exec struct\n");
1086                 return -ENOMEM;
1087         }
1088
1089         mutex_lock(&vc4->power_lock);
1090         if (vc4->power_refcount++ == 0) {
1091                 ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
1092                 if (ret < 0) {
1093                         mutex_unlock(&vc4->power_lock);
1094                         vc4->power_refcount--;
1095                         kfree(exec);
1096                         return ret;
1097                 }
1098         }
1099         mutex_unlock(&vc4->power_lock);
1100
1101         exec->args = args;
1102         INIT_LIST_HEAD(&exec->unref_list);
1103
1104         ret = vc4_cl_lookup_bos(dev, file_priv, exec);
1105         if (ret)
1106                 goto fail;
1107
1108         if (exec->args->bin_cl_size != 0) {
1109                 ret = vc4_get_bcl(dev, exec);
1110                 if (ret)
1111                         goto fail;
1112         } else {
1113                 exec->ct0ca = 0;
1114                 exec->ct0ea = 0;
1115         }
1116
1117         ret = vc4_get_rcl(dev, exec);
1118         if (ret)
1119                 goto fail;
1120
1121         ret = vc4_lock_bo_reservations(dev, exec, &acquire_ctx);
1122         if (ret)
1123                 goto fail;
1124
1125         /* Clear this out of the struct we'll be putting in the queue,
1126          * since it's part of our stack.
1127          */
1128         exec->args = NULL;
1129
1130         ret = vc4_queue_submit(dev, exec, &acquire_ctx);
1131         if (ret)
1132                 goto fail;
1133
1134         /* Return the seqno for our job. */
1135         args->seqno = vc4->emit_seqno;
1136
1137         return 0;
1138
1139 fail:
1140         vc4_complete_exec(vc4->dev, exec);
1141
1142         return ret;
1143 }
1144
1145 void
1146 vc4_gem_init(struct drm_device *dev)
1147 {
1148         struct vc4_dev *vc4 = to_vc4_dev(dev);
1149
1150         vc4->dma_fence_context = dma_fence_context_alloc(1);
1151
1152         INIT_LIST_HEAD(&vc4->bin_job_list);
1153         INIT_LIST_HEAD(&vc4->render_job_list);
1154         INIT_LIST_HEAD(&vc4->job_done_list);
1155         INIT_LIST_HEAD(&vc4->seqno_cb_list);
1156         spin_lock_init(&vc4->job_lock);
1157
1158         INIT_WORK(&vc4->hangcheck.reset_work, vc4_reset_work);
1159         timer_setup(&vc4->hangcheck.timer, vc4_hangcheck_elapsed, 0);
1160
1161         INIT_WORK(&vc4->job_done_work, vc4_job_done_work);
1162
1163         mutex_init(&vc4->power_lock);
1164
1165         INIT_LIST_HEAD(&vc4->purgeable.list);
1166         mutex_init(&vc4->purgeable.lock);
1167 }
1168
1169 void
1170 vc4_gem_destroy(struct drm_device *dev)
1171 {
1172         struct vc4_dev *vc4 = to_vc4_dev(dev);
1173
1174         /* Waiting for exec to finish would need to be done before
1175          * unregistering V3D.
1176          */
1177         WARN_ON(vc4->emit_seqno != vc4->finished_seqno);
1178
1179         /* V3D should already have disabled its interrupt and cleared
1180          * the overflow allocation registers.  Now free the object.
1181          */
1182         if (vc4->bin_bo) {
1183                 drm_gem_object_put_unlocked(&vc4->bin_bo->base.base);
1184                 vc4->bin_bo = NULL;
1185         }
1186
1187         if (vc4->hang_state)
1188                 vc4_free_hang_state(dev, vc4->hang_state);
1189 }
1190
1191 int vc4_gem_madvise_ioctl(struct drm_device *dev, void *data,
1192                           struct drm_file *file_priv)
1193 {
1194         struct drm_vc4_gem_madvise *args = data;
1195         struct drm_gem_object *gem_obj;
1196         struct vc4_bo *bo;
1197         int ret;
1198
1199         switch (args->madv) {
1200         case VC4_MADV_DONTNEED:
1201         case VC4_MADV_WILLNEED:
1202                 break;
1203         default:
1204                 return -EINVAL;
1205         }
1206
1207         if (args->pad != 0)
1208                 return -EINVAL;
1209
1210         gem_obj = drm_gem_object_lookup(file_priv, args->handle);
1211         if (!gem_obj) {
1212                 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
1213                 return -ENOENT;
1214         }
1215
1216         bo = to_vc4_bo(gem_obj);
1217
1218         /* Only BOs exposed to userspace can be purged. */
1219         if (bo->madv == __VC4_MADV_NOTSUPP) {
1220                 DRM_DEBUG("madvise not supported on this BO\n");
1221                 ret = -EINVAL;
1222                 goto out_put_gem;
1223         }
1224
1225         /* Not sure it's safe to purge imported BOs. Let's just assume it's
1226          * not until proven otherwise.
1227          */
1228         if (gem_obj->import_attach) {
1229                 DRM_DEBUG("madvise not supported on imported BOs\n");
1230                 ret = -EINVAL;
1231                 goto out_put_gem;
1232         }
1233
1234         mutex_lock(&bo->madv_lock);
1235
1236         if (args->madv == VC4_MADV_DONTNEED && bo->madv == VC4_MADV_WILLNEED &&
1237             !refcount_read(&bo->usecnt)) {
1238                 /* If the BO is about to be marked as purgeable, is not used
1239                  * and is not already purgeable or purged, add it to the
1240                  * purgeable list.
1241                  */
1242                 vc4_bo_add_to_purgeable_pool(bo);
1243         } else if (args->madv == VC4_MADV_WILLNEED &&
1244                    bo->madv == VC4_MADV_DONTNEED &&
1245                    !refcount_read(&bo->usecnt)) {
1246                 /* The BO has not been purged yet, just remove it from
1247                  * the purgeable list.
1248                  */
1249                 vc4_bo_remove_from_purgeable_pool(bo);
1250         }
1251
1252         /* Save the purged state. */
1253         args->retained = bo->madv != __VC4_MADV_PURGED;
1254
1255         /* Update internal madv state only if the bo was not purged. */
1256         if (bo->madv != __VC4_MADV_PURGED)
1257                 bo->madv = args->madv;
1258
1259         mutex_unlock(&bo->madv_lock);
1260
1261         ret = 0;
1262
1263 out_put_gem:
1264         drm_gem_object_put_unlocked(gem_obj);
1265
1266         return ret;
1267 }