drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <glisse@freedesktop.org>
  29  *    Dave Airlie
  30  */
  31 #include <linux/seq_file.h>
  32 #include <linux/atomic.h>
  33 #include <linux/wait.h>
  34 #include <linux/kref.h>
  35 #include <linux/slab.h>
  36 #include <linux/firmware.h>
  37 #include <drm/drmP.h>
  38 #include "amdgpu.h"
  39 #include "amdgpu_trace.h"
  40
  41 /*
  42  * Fences
  43  * Fences mark an event in the GPUs pipeline and are used
  44  * for GPU/CPU synchronization.  When the fence is written,
  45  * it is expected that all buffers associated with that fence
  46  * are no longer in use by the associated ring on the GPU and
  47  * that the the relevant GPU caches have been flushed.
  48  */
  49
  50 struct amdgpu_fence {
  51         struct dma_fence base;
  52
  53         /* RB, DMA, etc. */
  54         struct amdgpu_ring              *ring;
  55 };
  56
  57 static struct kmem_cache *amdgpu_fence_slab;
  58
  59 int amdgpu_fence_slab_init(void)
  60 {
  61         amdgpu_fence_slab = kmem_cache_create(
  62                 "amdgpu_fence", sizeof(struct amdgpu_fence), 0,
  63                 SLAB_HWCACHE_ALIGN, NULL);
  64         if (!amdgpu_fence_slab)
  65                 return -ENOMEM;
  66         return 0;
  67 }
  68
  69 void amdgpu_fence_slab_fini(void)
  70 {
  71         rcu_barrier();
  72         kmem_cache_destroy(amdgpu_fence_slab);
  73 }
  74 /*
  75  * Cast helper
  76  */
  77 static const struct dma_fence_ops amdgpu_fence_ops;
  78 static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  79 {
  80         struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
  81
  82         if (__f->base.ops == &amdgpu_fence_ops)
  83                 return __f;
  84
  85         return NULL;
  86 }
  87
  88 /**
  89  * amdgpu_fence_write - write a fence value
  90  *
  91  * @ring: ring the fence is associated with
  92  * @seq: sequence number to write
  93  *
  94  * Writes a fence value to memory (all asics).
  95  */
  96 static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq)
  97 {
  98         struct amdgpu_fence_driver *drv = &ring->fence_drv;
  99
 100         if (drv->cpu_addr)
 101                 *drv->cpu_addr = cpu_to_le32(seq);
 102 }
 103
 104 /**
 105  * amdgpu_fence_read - read a fence value
 106  *
 107  * @ring: ring the fence is associated with
 108  *
 109  * Reads a fence value from memory (all asics).
 110  * Returns the value of the fence read from memory.
 111  */
 112 static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
 113 {
 114         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 115         u32 seq = 0;
 116
 117         if (drv->cpu_addr)
 118                 seq = le32_to_cpu(*drv->cpu_addr);
 119         else
 120                 seq = atomic_read(&drv->last_seq);
 121
 122         return seq;
 123 }
 124
 125 /**
 126  * amdgpu_fence_emit - emit a fence on the requested ring
 127  *
 128  * @ring: ring the fence is associated with
 129  * @f: resulting fence object
 130  *
 131  * Emits a fence command on the requested ring (all asics).
 132  * Returns 0 on success, -ENOMEM on failure.
 133  */
 134 int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f,
 135                       unsigned flags)
 136 {
 137         struct amdgpu_device *adev = ring->adev;
 138         struct amdgpu_fence *fence;
 139         struct dma_fence *old, **ptr;
 140         uint32_t seq;
 141
 142         fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
 143         if (fence == NULL)
 144                 return -ENOMEM;
 145
 146         seq = ++ring->fence_drv.sync_seq;
 147         fence->ring = ring;
 148         dma_fence_init(&fence->base, &amdgpu_fence_ops,
 149                        &ring->fence_drv.lock,
 150                        adev->fence_context + ring->idx,
 151                        seq);
 152         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 153                                seq, flags | AMDGPU_FENCE_FLAG_INT);
 154
 155         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 156         /* This function can't be called concurrently anyway, otherwise
 157          * emitting the fence would mess up the hardware ring buffer.
 158          */
 159         old = rcu_dereference_protected(*ptr, 1);
 160         if (old && !dma_fence_is_signaled(old)) {
 161                 DRM_INFO("rcu slot is busy\n");
 162                 dma_fence_wait(old, false);
 163         }
 164
 165         rcu_assign_pointer(*ptr, dma_fence_get(&fence->base));
 166
 167         *f = &fence->base;
 168
 169         return 0;
 170 }
 171
 172 /**
 173  * amdgpu_fence_emit_polling - emit a fence on the requeste ring
 174  *
 175  * @ring: ring the fence is associated with
 176  * @s: resulting sequence number
 177  *
 178  * Emits a fence command on the requested ring (all asics).
 179  * Used For polling fence.
 180  * Returns 0 on success, -ENOMEM on failure.
 181  */
 182 int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s)
 183 {
 184         uint32_t seq;
 185
 186         if (!s)
 187                 return -EINVAL;
 188
 189         seq = ++ring->fence_drv.sync_seq;
 190         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 191                                seq, 0);
 192
 193         *s = seq;
 194
 195         return 0;
 196 }
 197
 198 /**
 199  * amdgpu_fence_schedule_fallback - schedule fallback check
 200  *
 201  * @ring: pointer to struct amdgpu_ring
 202  *
 203  * Start a timer as fallback to our interrupts.
 204  */
 205 static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
 206 {
 207         mod_timer(&ring->fence_drv.fallback_timer,
 208                   jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
 209 }
 210
 211 /**
 212  * amdgpu_fence_process - check for fence activity
 213  *
 214  * @ring: pointer to struct amdgpu_ring
 215  *
 216  * Checks the current fence value and calculates the last
 217  * signalled fence value. Wakes the fence queue if the
 218  * sequence number has increased.
 219  */
 220 void amdgpu_fence_process(struct amdgpu_ring *ring)
 221 {
 222         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 223         uint32_t seq, last_seq;
 224         int r;
 225
 226         do {
 227                 last_seq = atomic_read(&ring->fence_drv.last_seq);
 228                 seq = amdgpu_fence_read(ring);
 229
 230         } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 231
 232         if (seq != ring->fence_drv.sync_seq)
 233                 amdgpu_fence_schedule_fallback(ring);
 234
 235         if (unlikely(seq == last_seq))
 236                 return;
 237
 238         last_seq &= drv->num_fences_mask;
 239         seq &= drv->num_fences_mask;
 240
 241         do {
 242                 struct dma_fence *fence, **ptr;
 243
 244                 ++last_seq;
 245                 last_seq &= drv->num_fences_mask;
 246                 ptr = &drv->fences[last_seq];
 247
 248                 /* There is always exactly one thread signaling this fence slot */
 249                 fence = rcu_dereference_protected(*ptr, 1);
 250                 RCU_INIT_POINTER(*ptr, NULL);
 251
 252                 if (!fence)
 253                         continue;
 254
 255                 r = dma_fence_signal(fence);
 256                 if (!r)
 257                         DMA_FENCE_TRACE(fence, "signaled from irq context\n");
 258                 else
 259                         BUG();
 260
 261                 dma_fence_put(fence);
 262         } while (last_seq != seq);
 263 }
 264
 265 /**
 266  * amdgpu_fence_fallback - fallback for hardware interrupts
 267  *
 268  * @work: delayed work item
 269  *
 270  * Checks for fence activity.
 271  */
 272 static void amdgpu_fence_fallback(struct timer_list *t)
 273 {
 274         struct amdgpu_ring *ring = from_timer(ring, t,
 275                                               fence_drv.fallback_timer);
 276
 277         amdgpu_fence_process(ring);
 278 }
 279
 280 /**
 281  * amdgpu_fence_wait_empty - wait for all fences to signal
 282  *
 283  * @adev: amdgpu device pointer
 284  * @ring: ring index the fence is associated with
 285  *
 286  * Wait for all fences on the requested ring to signal (all asics).
 287  * Returns 0 if the fences have passed, error for all other cases.
 288  */
 289 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 290 {
 291         uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
 292         struct dma_fence *fence, **ptr;
 293         int r;
 294
 295         if (!seq)
 296                 return 0;
 297
 298         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 299         rcu_read_lock();
 300         fence = rcu_dereference(*ptr);
 301         if (!fence || !dma_fence_get_rcu(fence)) {
 302                 rcu_read_unlock();
 303                 return 0;
 304         }
 305         rcu_read_unlock();
 306
 307         r = dma_fence_wait(fence, false);
 308         dma_fence_put(fence);
 309         return r;
 310 }
 311
 312 /**
 313  * amdgpu_fence_wait_polling - busy wait for givn sequence number
 314  *
 315  * @ring: ring index the fence is associated with
 316  * @wait_seq: sequence number to wait
 317  * @timeout: the timeout for waiting in usecs
 318  *
 319  * Wait for all fences on the requested ring to signal (all asics).
 320  * Returns left time if no timeout, 0 or minus if timeout.
 321  */
 322 signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 323                                       uint32_t wait_seq,
 324                                       signed long timeout)
 325 {
 326         uint32_t seq;
 327
 328         do {
 329                 seq = amdgpu_fence_read(ring);
 330                 udelay(5);
 331                 timeout -= 5;
 332         } while ((int32_t)(wait_seq - seq) > 0 && timeout > 0);
 333
 334         return timeout > 0 ? timeout : 0;
 335 }
 336 /**
 337  * amdgpu_fence_count_emitted - get the count of emitted fences
 338  *
 339  * @ring: ring the fence is associated with
 340  *
 341  * Get the number of fences emitted on the requested ring (all asics).
 342  * Returns the number of emitted fences on the ring.  Used by the
 343  * dynpm code to ring track activity.
 344  */
 345 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 346 {
 347         uint64_t emitted;
 348
 349         /* We are not protected by ring lock when reading the last sequence
 350          * but it's ok to report slightly wrong fence count here.
 351          */
 352         amdgpu_fence_process(ring);
 353         emitted = 0x100000000ull;
 354         emitted -= atomic_read(&ring->fence_drv.last_seq);
 355         emitted += READ_ONCE(ring->fence_drv.sync_seq);
 356         return lower_32_bits(emitted);
 357 }
 358
 359 /**
 360  * amdgpu_fence_driver_start_ring - make the fence driver
 361  * ready for use on the requested ring.
 362  *
 363  * @ring: ring to start the fence driver on
 364  * @irq_src: interrupt source to use for this ring
 365  * @irq_type: interrupt type to use for this ring
 366  *
 367  * Make the fence driver ready for processing (all asics).
 368  * Not all asics have all rings, so each asic will only
 369  * start the fence driver on the rings it has.
 370  * Returns 0 for success, errors for failure.
 371  */
 372 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 373                                    struct amdgpu_irq_src *irq_src,
 374                                    unsigned irq_type)
 375 {
 376         struct amdgpu_device *adev = ring->adev;
 377         uint64_t index;
 378
 379         if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 380                 ring->fence_drv.cpu_addr = &adev->wb.wb[ring->fence_offs];
 381                 ring->fence_drv.gpu_addr = adev->wb.gpu_addr + (ring->fence_offs * 4);
 382         } else {
 383                 /* put fence directly behind firmware */
 384                 index = ALIGN(adev->uvd.fw->size, 8);
 385                 ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 386                 ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 387         }
 388         amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 389         amdgpu_irq_get(adev, irq_src, irq_type);
 390
 391         ring->fence_drv.irq_src = irq_src;
 392         ring->fence_drv.irq_type = irq_type;
 393         ring->fence_drv.initialized = true;
 394
 395         dev_dbg(adev->dev, "fence driver on ring %d use gpu addr 0x%016llx, "
 396                 "cpu addr 0x%p\n", ring->idx,
 397                 ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr);
 398         return 0;
 399 }
 400
 401 /**
 402  * amdgpu_fence_driver_init_ring - init the fence driver
 403  * for the requested ring.
 404  *
 405  * @ring: ring to init the fence driver on
 406  * @num_hw_submission: number of entries on the hardware queue
 407  *
 408  * Init the fence driver for the requested ring (all asics).
 409  * Helper function for amdgpu_fence_driver_init().
 410  */
 411 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
 412                                   unsigned num_hw_submission)
 413 {
 414         long timeout;
 415         int r;
 416
 417         /* Check that num_hw_submission is a power of two */
 418         if ((num_hw_submission & (num_hw_submission - 1)) != 0)
 419                 return -EINVAL;
 420
 421         ring->fence_drv.cpu_addr = NULL;
 422         ring->fence_drv.gpu_addr = 0;
 423         ring->fence_drv.sync_seq = 0;
 424         atomic_set(&ring->fence_drv.last_seq, 0);
 425         ring->fence_drv.initialized = false;
 426
 427         timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 428
 429         ring->fence_drv.num_fences_mask = num_hw_submission * 2 - 1;
 430         spin_lock_init(&ring->fence_drv.lock);
 431         ring->fence_drv.fences = kcalloc(num_hw_submission * 2, sizeof(void *),
 432                                          GFP_KERNEL);
 433         if (!ring->fence_drv.fences)
 434                 return -ENOMEM;
 435
 436         /* No need to setup the GPU scheduler for KIQ ring */
 437         if (ring->funcs->type != AMDGPU_RING_TYPE_KIQ) {
 438                 /* for non-sriov case, no timeout enforce on compute ring */
 439                 if ((ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE)
 440                                 && !amdgpu_sriov_vf(ring->adev))
 441                         timeout = MAX_SCHEDULE_TIMEOUT;
 442                 else
 443                         timeout = msecs_to_jiffies(amdgpu_lockup_timeout);
 444
 445                 r = drm_sched_init(&ring->sched, &amdgpu_sched_ops,
 446                                    num_hw_submission, amdgpu_job_hang_limit,
 447                                    timeout, ring->name);
 448                 if (r) {
 449                         DRM_ERROR("Failed to create scheduler on ring %s.\n",
 450                                   ring->name);
 451                         return r;
 452                 }
 453         }
 454
 455         return 0;
 456 }
 457
 458 /**
 459  * amdgpu_fence_driver_init - init the fence driver
 460  * for all possible rings.
 461  *
 462  * @adev: amdgpu device pointer
 463  *
 464  * Init the fence driver for all possible rings (all asics).
 465  * Not all asics have all rings, so each asic will only
 466  * start the fence driver on the rings it has using
 467  * amdgpu_fence_driver_start_ring().
 468  * Returns 0 for success.
 469  */
 470 int amdgpu_fence_driver_init(struct amdgpu_device *adev)
 471 {
 472         if (amdgpu_debugfs_fence_init(adev))
 473                 dev_err(adev->dev, "fence debugfs file creation failed\n");
 474
 475         return 0;
 476 }
 477
 478 /**
 479  * amdgpu_fence_driver_fini - tear down the fence driver
 480  * for all possible rings.
 481  *
 482  * @adev: amdgpu device pointer
 483  *
 484  * Tear down the fence driver for all possible rings (all asics).
 485  */
 486 void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
 487 {
 488         unsigned i, j;
 489         int r;
 490
 491         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 492                 struct amdgpu_ring *ring = adev->rings[i];
 493
 494                 if (!ring || !ring->fence_drv.initialized)
 495                         continue;
 496                 r = amdgpu_fence_wait_empty(ring);
 497                 if (r) {
 498                         /* no need to trigger GPU reset as we are unloading */
 499                         amdgpu_fence_driver_force_completion(ring);
 500                 }
 501                 amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 502                                ring->fence_drv.irq_type);
 503                 drm_sched_fini(&ring->sched);
 504                 del_timer_sync(&ring->fence_drv.fallback_timer);
 505                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 506                         dma_fence_put(ring->fence_drv.fences[j]);
 507                 kfree(ring->fence_drv.fences);
 508                 ring->fence_drv.fences = NULL;
 509                 ring->fence_drv.initialized = false;
 510         }
 511 }
 512
 513 /**
 514  * amdgpu_fence_driver_suspend - suspend the fence driver
 515  * for all possible rings.
 516  *
 517  * @adev: amdgpu device pointer
 518  *
 519  * Suspend the fence driver for all possible rings (all asics).
 520  */
 521 void amdgpu_fence_driver_suspend(struct amdgpu_device *adev)
 522 {
 523         int i, r;
 524
 525         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 526                 struct amdgpu_ring *ring = adev->rings[i];
 527                 if (!ring || !ring->fence_drv.initialized)
 528                         continue;
 529
 530                 /* wait for gpu to finish processing current batch */
 531                 r = amdgpu_fence_wait_empty(ring);
 532                 if (r) {
 533                         /* delay GPU reset to resume */
 534                         amdgpu_fence_driver_force_completion(ring);
 535                 }
 536
 537                 /* disable the interrupt */
 538                 amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 539                                ring->fence_drv.irq_type);
 540         }
 541 }
 542
 543 /**
 544  * amdgpu_fence_driver_resume - resume the fence driver
 545  * for all possible rings.
 546  *
 547  * @adev: amdgpu device pointer
 548  *
 549  * Resume the fence driver for all possible rings (all asics).
 550  * Not all asics have all rings, so each asic will only
 551  * start the fence driver on the rings it has using
 552  * amdgpu_fence_driver_start_ring().
 553  * Returns 0 for success.
 554  */
 555 void amdgpu_fence_driver_resume(struct amdgpu_device *adev)
 556 {
 557         int i;
 558
 559         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 560                 struct amdgpu_ring *ring = adev->rings[i];
 561                 if (!ring || !ring->fence_drv.initialized)
 562                         continue;
 563
 564                 /* enable the interrupt */
 565                 amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 566                                ring->fence_drv.irq_type);
 567         }
 568 }
 569
 570 /**
 571  * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 572  *
 573  * @ring: fence of the ring to signal
 574  *
 575  */
 576 void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 577 {
 578         amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 579         amdgpu_fence_process(ring);
 580 }
 581
 582 /*
 583  * Common fence implementation
 584  */
 585
 586 static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 587 {
 588         return "amdgpu";
 589 }
 590
 591 static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 592 {
 593         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 594         return (const char *)fence->ring->name;
 595 }
 596
 597 /**
 598  * amdgpu_fence_enable_signaling - enable signalling on fence
 599  * @fence: fence
 600  *
 601  * This function is called with fence_queue lock held, and adds a callback
 602  * to fence_queue that checks if this fence is signaled, and if so it
 603  * signals the fence and removes itself.
 604  */
 605 static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 606 {
 607         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 608         struct amdgpu_ring *ring = fence->ring;
 609
 610         if (!timer_pending(&ring->fence_drv.fallback_timer))
 611                 amdgpu_fence_schedule_fallback(ring);
 612
 613         DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
 614
 615         return true;
 616 }
 617
 618 /**
 619  * amdgpu_fence_free - free up the fence memory
 620  *
 621  * @rcu: RCU callback head
 622  *
 623  * Free up the fence memory after the RCU grace period.
 624  */
 625 static void amdgpu_fence_free(struct rcu_head *rcu)
 626 {
 627         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 628         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 629         kmem_cache_free(amdgpu_fence_slab, fence);
 630 }
 631
 632 /**
 633  * amdgpu_fence_release - callback that fence can be freed
 634  *
 635  * @fence: fence
 636  *
 637  * This function is called when the reference count becomes zero.
 638  * It just RCU schedules freeing up the fence.
 639  */
 640 static void amdgpu_fence_release(struct dma_fence *f)
 641 {
 642         call_rcu(&f->rcu, amdgpu_fence_free);
 643 }
 644
 645 static const struct dma_fence_ops amdgpu_fence_ops = {
 646         .get_driver_name = amdgpu_fence_get_driver_name,
 647         .get_timeline_name = amdgpu_fence_get_timeline_name,
 648         .enable_signaling = amdgpu_fence_enable_signaling,
 649         .wait = dma_fence_default_wait,
 650         .release = amdgpu_fence_release,
 651 };
 652
 653 /*
 654  * Fence debugfs
 655  */
 656 #if defined(CONFIG_DEBUG_FS)
 657 static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data)
 658 {
 659         struct drm_info_node *node = (struct drm_info_node *)m->private;
 660         struct drm_device *dev = node->minor->dev;
 661         struct amdgpu_device *adev = dev->dev_private;
 662         int i;
 663
 664         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 665                 struct amdgpu_ring *ring = adev->rings[i];
 666                 if (!ring || !ring->fence_drv.initialized)
 667                         continue;
 668
 669                 amdgpu_fence_process(ring);
 670
 671                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 672                 seq_printf(m, "Last signaled fence 0x%08x\n",
 673                            atomic_read(&ring->fence_drv.last_seq));
 674                 seq_printf(m, "Last emitted        0x%08x\n",
 675                            ring->fence_drv.sync_seq);
 676
 677                 if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 678                         continue;
 679
 680                 /* set in CP_VMID_PREEMPT and preemption occurred */
 681                 seq_printf(m, "Last preempted      0x%08x\n",
 682                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 683                 /* set in CP_VMID_RESET and reset occurred */
 684                 seq_printf(m, "Last reset          0x%08x\n",
 685                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 686                 /* Both preemption and reset occurred */
 687                 seq_printf(m, "Last both           0x%08x\n",
 688                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 689         }
 690         return 0;
 691 }
 692
 693 /**
 694  * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 695  *
 696  * Manually trigger a gpu reset at the next fence wait.
 697  */
 698 static int amdgpu_debugfs_gpu_recover(struct seq_file *m, void *data)
 699 {
 700         struct drm_info_node *node = (struct drm_info_node *) m->private;
 701         struct drm_device *dev = node->minor->dev;
 702         struct amdgpu_device *adev = dev->dev_private;
 703
 704         seq_printf(m, "gpu recover\n");
 705         amdgpu_device_gpu_recover(adev, NULL, true);
 706
 707         return 0;
 708 }
 709
 710 static const struct drm_info_list amdgpu_debugfs_fence_list[] = {
 711         {"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL},
 712         {"amdgpu_gpu_recover", &amdgpu_debugfs_gpu_recover, 0, NULL}
 713 };
 714
 715 static const struct drm_info_list amdgpu_debugfs_fence_list_sriov[] = {
 716         {"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL},
 717 };
 718 #endif
 719
 720 int amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 721 {
 722 #if defined(CONFIG_DEBUG_FS)
 723         if (amdgpu_sriov_vf(adev))
 724                 return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list_sriov, 1);
 725         return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list, 2);
 726 #else
 727         return 0;
 728 #endif
 729 }
 730