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 <linux/pm_runtime.h>
  38
  39 #include "amdgpu.h"
  40 #include "amdgpu_trace.h"
  41
  42 /*
  43  * Fences
  44  * Fences mark an event in the GPUs pipeline and are used
  45  * for GPU/CPU synchronization.  When the fence is written,
  46  * it is expected that all buffers associated with that fence
  47  * are no longer in use by the associated ring on the GPU and
  48  * that the the relevant GPU caches have been flushed.
  49  */
  50
  51 struct amdgpu_fence {
  52         struct dma_fence base;
  53
  54         /* RB, DMA, etc. */
  55         struct amdgpu_ring              *ring;
  56 };
  57
  58 static struct kmem_cache *amdgpu_fence_slab;
  59
  60 int amdgpu_fence_slab_init(void)
  61 {
  62         amdgpu_fence_slab = kmem_cache_create(
  63                 "amdgpu_fence", sizeof(struct amdgpu_fence), 0,
  64                 SLAB_HWCACHE_ALIGN, NULL);
  65         if (!amdgpu_fence_slab)
  66                 return -ENOMEM;
  67         return 0;
  68 }
  69
  70 void amdgpu_fence_slab_fini(void)
  71 {
  72         rcu_barrier();
  73         kmem_cache_destroy(amdgpu_fence_slab);
  74 }
  75 /*
  76  * Cast helper
  77  */
  78 static const struct dma_fence_ops amdgpu_fence_ops;
  79 static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  80 {
  81         struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
  82
  83         if (__f->base.ops == &amdgpu_fence_ops)
  84                 return __f;
  85
  86         return NULL;
  87 }
  88
  89 /**
  90  * amdgpu_fence_write - write a fence value
  91  *
  92  * @ring: ring the fence is associated with
  93  * @seq: sequence number to write
  94  *
  95  * Writes a fence value to memory (all asics).
  96  */
  97 static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq)
  98 {
  99         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 100
 101         if (drv->cpu_addr)
 102                 *drv->cpu_addr = cpu_to_le32(seq);
 103 }
 104
 105 /**
 106  * amdgpu_fence_read - read a fence value
 107  *
 108  * @ring: ring the fence is associated with
 109  *
 110  * Reads a fence value from memory (all asics).
 111  * Returns the value of the fence read from memory.
 112  */
 113 static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
 114 {
 115         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 116         u32 seq = 0;
 117
 118         if (drv->cpu_addr)
 119                 seq = le32_to_cpu(*drv->cpu_addr);
 120         else
 121                 seq = atomic_read(&drv->last_seq);
 122
 123         return seq;
 124 }
 125
 126 /**
 127  * amdgpu_fence_emit - emit a fence on the requested ring
 128  *
 129  * @ring: ring the fence is associated with
 130  * @f: resulting fence object
 131  * @flags: flags to pass into the subordinate .emit_fence() call
 132  *
 133  * Emits a fence command on the requested ring (all asics).
 134  * Returns 0 on success, -ENOMEM on failure.
 135  */
 136 int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f,
 137                       unsigned flags)
 138 {
 139         struct amdgpu_device *adev = ring->adev;
 140         struct amdgpu_fence *fence;
 141         struct dma_fence __rcu **ptr;
 142         uint32_t seq;
 143         int r;
 144
 145         fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
 146         if (fence == NULL)
 147                 return -ENOMEM;
 148
 149         seq = ++ring->fence_drv.sync_seq;
 150         fence->ring = ring;
 151         dma_fence_init(&fence->base, &amdgpu_fence_ops,
 152                        &ring->fence_drv.lock,
 153                        adev->fence_context + ring->idx,
 154                        seq);
 155         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 156                                seq, flags | AMDGPU_FENCE_FLAG_INT);
 157         pm_runtime_get_noresume(adev_to_drm(adev)->dev);
 158         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 159         if (unlikely(rcu_dereference_protected(*ptr, 1))) {
 160                 struct dma_fence *old;
 161
 162                 rcu_read_lock();
 163                 old = dma_fence_get_rcu_safe(ptr);
 164                 rcu_read_unlock();
 165
 166                 if (old) {
 167                         r = dma_fence_wait(old, false);
 168                         dma_fence_put(old);
 169                         if (r)
 170                                 return r;
 171                 }
 172         }
 173
 174         /* This function can't be called concurrently anyway, otherwise
 175          * emitting the fence would mess up the hardware ring buffer.
 176          */
 177         rcu_assign_pointer(*ptr, dma_fence_get(&fence->base));
 178
 179         *f = &fence->base;
 180
 181         return 0;
 182 }
 183
 184 /**
 185  * amdgpu_fence_emit_polling - emit a fence on the requeste ring
 186  *
 187  * @ring: ring the fence is associated with
 188  * @s: resulting sequence number
 189  * @timeout: the timeout for waiting in usecs
 190  *
 191  * Emits a fence command on the requested ring (all asics).
 192  * Used For polling fence.
 193  * Returns 0 on success, -ENOMEM on failure.
 194  */
 195 int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
 196                               uint32_t timeout)
 197 {
 198         uint32_t seq;
 199         signed long r;
 200
 201         if (!s)
 202                 return -EINVAL;
 203
 204         seq = ++ring->fence_drv.sync_seq;
 205         r = amdgpu_fence_wait_polling(ring,
 206                                       seq - ring->fence_drv.num_fences_mask,
 207                                       timeout);
 208         if (r < 1)
 209                 return -ETIMEDOUT;
 210
 211         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 212                                seq, 0);
 213
 214         *s = seq;
 215
 216         return 0;
 217 }
 218
 219 /**
 220  * amdgpu_fence_schedule_fallback - schedule fallback check
 221  *
 222  * @ring: pointer to struct amdgpu_ring
 223  *
 224  * Start a timer as fallback to our interrupts.
 225  */
 226 static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
 227 {
 228         mod_timer(&ring->fence_drv.fallback_timer,
 229                   jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
 230 }
 231
 232 /**
 233  * amdgpu_fence_process - check for fence activity
 234  *
 235  * @ring: pointer to struct amdgpu_ring
 236  *
 237  * Checks the current fence value and calculates the last
 238  * signalled fence value. Wakes the fence queue if the
 239  * sequence number has increased.
 240  *
 241  * Returns true if fence was processed
 242  */
 243 bool amdgpu_fence_process(struct amdgpu_ring *ring)
 244 {
 245         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 246         struct amdgpu_device *adev = ring->adev;
 247         uint32_t seq, last_seq;
 248         int r;
 249
 250         do {
 251                 last_seq = atomic_read(&ring->fence_drv.last_seq);
 252                 seq = amdgpu_fence_read(ring);
 253
 254         } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 255
 256         if (del_timer(&ring->fence_drv.fallback_timer) &&
 257             seq != ring->fence_drv.sync_seq)
 258                 amdgpu_fence_schedule_fallback(ring);
 259
 260         if (unlikely(seq == last_seq))
 261                 return false;
 262
 263         last_seq &= drv->num_fences_mask;
 264         seq &= drv->num_fences_mask;
 265
 266         do {
 267                 struct dma_fence *fence, **ptr;
 268
 269                 ++last_seq;
 270                 last_seq &= drv->num_fences_mask;
 271                 ptr = &drv->fences[last_seq];
 272
 273                 /* There is always exactly one thread signaling this fence slot */
 274                 fence = rcu_dereference_protected(*ptr, 1);
 275                 RCU_INIT_POINTER(*ptr, NULL);
 276
 277                 if (!fence)
 278                         continue;
 279
 280                 r = dma_fence_signal(fence);
 281                 if (!r)
 282                         DMA_FENCE_TRACE(fence, "signaled from irq context\n");
 283                 else
 284                         BUG();
 285
 286                 dma_fence_put(fence);
 287                 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 288                 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 289         } while (last_seq != seq);
 290
 291         return true;
 292 }
 293
 294 /**
 295  * amdgpu_fence_fallback - fallback for hardware interrupts
 296  *
 297  * @t: timer context used to obtain the pointer to ring structure
 298  *
 299  * Checks for fence activity.
 300  */
 301 static void amdgpu_fence_fallback(struct timer_list *t)
 302 {
 303         struct amdgpu_ring *ring = from_timer(ring, t,
 304                                               fence_drv.fallback_timer);
 305
 306         if (amdgpu_fence_process(ring))
 307                 DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name);
 308 }
 309
 310 /**
 311  * amdgpu_fence_wait_empty - wait for all fences to signal
 312  *
 313  * @ring: ring index the fence is associated with
 314  *
 315  * Wait for all fences on the requested ring to signal (all asics).
 316  * Returns 0 if the fences have passed, error for all other cases.
 317  */
 318 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 319 {
 320         uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
 321         struct dma_fence *fence, **ptr;
 322         int r;
 323
 324         if (!seq)
 325                 return 0;
 326
 327         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 328         rcu_read_lock();
 329         fence = rcu_dereference(*ptr);
 330         if (!fence || !dma_fence_get_rcu(fence)) {
 331                 rcu_read_unlock();
 332                 return 0;
 333         }
 334         rcu_read_unlock();
 335
 336         r = dma_fence_wait(fence, false);
 337         dma_fence_put(fence);
 338         return r;
 339 }
 340
 341 /**
 342  * amdgpu_fence_wait_polling - busy wait for givn sequence number
 343  *
 344  * @ring: ring index the fence is associated with
 345  * @wait_seq: sequence number to wait
 346  * @timeout: the timeout for waiting in usecs
 347  *
 348  * Wait for all fences on the requested ring to signal (all asics).
 349  * Returns left time if no timeout, 0 or minus if timeout.
 350  */
 351 signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 352                                       uint32_t wait_seq,
 353                                       signed long timeout)
 354 {
 355         uint32_t seq;
 356
 357         do {
 358                 seq = amdgpu_fence_read(ring);
 359                 udelay(5);
 360                 timeout -= 5;
 361         } while ((int32_t)(wait_seq - seq) > 0 && timeout > 0);
 362
 363         return timeout > 0 ? timeout : 0;
 364 }
 365 /**
 366  * amdgpu_fence_count_emitted - get the count of emitted fences
 367  *
 368  * @ring: ring the fence is associated with
 369  *
 370  * Get the number of fences emitted on the requested ring (all asics).
 371  * Returns the number of emitted fences on the ring.  Used by the
 372  * dynpm code to ring track activity.
 373  */
 374 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 375 {
 376         uint64_t emitted;
 377
 378         /* We are not protected by ring lock when reading the last sequence
 379          * but it's ok to report slightly wrong fence count here.
 380          */
 381         amdgpu_fence_process(ring);
 382         emitted = 0x100000000ull;
 383         emitted -= atomic_read(&ring->fence_drv.last_seq);
 384         emitted += READ_ONCE(ring->fence_drv.sync_seq);
 385         return lower_32_bits(emitted);
 386 }
 387
 388 /**
 389  * amdgpu_fence_driver_start_ring - make the fence driver
 390  * ready for use on the requested ring.
 391  *
 392  * @ring: ring to start the fence driver on
 393  * @irq_src: interrupt source to use for this ring
 394  * @irq_type: interrupt type to use for this ring
 395  *
 396  * Make the fence driver ready for processing (all asics).
 397  * Not all asics have all rings, so each asic will only
 398  * start the fence driver on the rings it has.
 399  * Returns 0 for success, errors for failure.
 400  */
 401 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 402                                    struct amdgpu_irq_src *irq_src,
 403                                    unsigned irq_type)
 404 {
 405         struct amdgpu_device *adev = ring->adev;
 406         uint64_t index;
 407
 408         if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 409                 ring->fence_drv.cpu_addr = &adev->wb.wb[ring->fence_offs];
 410                 ring->fence_drv.gpu_addr = adev->wb.gpu_addr + (ring->fence_offs * 4);
 411         } else {
 412                 /* put fence directly behind firmware */
 413                 index = ALIGN(adev->uvd.fw->size, 8);
 414                 ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 415                 ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 416         }
 417         amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 418
 419         if (irq_src)
 420                 amdgpu_irq_get(adev, irq_src, irq_type);
 421
 422         ring->fence_drv.irq_src = irq_src;
 423         ring->fence_drv.irq_type = irq_type;
 424         ring->fence_drv.initialized = true;
 425
 426         DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
 427                       ring->name, ring->fence_drv.gpu_addr);
 428         return 0;
 429 }
 430
 431 /**
 432  * amdgpu_fence_driver_init_ring - init the fence driver
 433  * for the requested ring.
 434  *
 435  * @ring: ring to init the fence driver on
 436  * @num_hw_submission: number of entries on the hardware queue
 437  *
 438  * Init the fence driver for the requested ring (all asics).
 439  * Helper function for amdgpu_fence_driver_init().
 440  */
 441 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring,
 442                                   unsigned num_hw_submission)
 443 {
 444         struct amdgpu_device *adev = ring->adev;
 445         long timeout;
 446         int r;
 447
 448         if (!adev)
 449                 return -EINVAL;
 450
 451         if (!is_power_of_2(num_hw_submission))
 452                 return -EINVAL;
 453
 454         ring->fence_drv.cpu_addr = NULL;
 455         ring->fence_drv.gpu_addr = 0;
 456         ring->fence_drv.sync_seq = 0;
 457         atomic_set(&ring->fence_drv.last_seq, 0);
 458         ring->fence_drv.initialized = false;
 459
 460         timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 461
 462         ring->fence_drv.num_fences_mask = num_hw_submission * 2 - 1;
 463         spin_lock_init(&ring->fence_drv.lock);
 464         ring->fence_drv.fences = kcalloc(num_hw_submission * 2, sizeof(void *),
 465                                          GFP_KERNEL);
 466         if (!ring->fence_drv.fences)
 467                 return -ENOMEM;
 468
 469         /* No need to setup the GPU scheduler for rings that don't need it */
 470         if (!ring->no_scheduler) {
 471                 switch (ring->funcs->type) {
 472                 case AMDGPU_RING_TYPE_GFX:
 473                         timeout = adev->gfx_timeout;
 474                         break;
 475                 case AMDGPU_RING_TYPE_COMPUTE:
 476                         timeout = adev->compute_timeout;
 477                         break;
 478                 case AMDGPU_RING_TYPE_SDMA:
 479                         timeout = adev->sdma_timeout;
 480                         break;
 481                 default:
 482                         timeout = adev->video_timeout;
 483                         break;
 484                 }
 485
 486                 r = drm_sched_init(&ring->sched, &amdgpu_sched_ops,
 487                                    num_hw_submission, amdgpu_job_hang_limit,
 488                                    timeout, ring->name);
 489                 if (r) {
 490                         DRM_ERROR("Failed to create scheduler on ring %s.\n",
 491                                   ring->name);
 492                         return r;
 493                 }
 494         }
 495
 496         return 0;
 497 }
 498
 499 /**
 500  * amdgpu_fence_driver_init - init the fence driver
 501  * for all possible rings.
 502  *
 503  * @adev: amdgpu device pointer
 504  *
 505  * Init the fence driver for all possible rings (all asics).
 506  * Not all asics have all rings, so each asic will only
 507  * start the fence driver on the rings it has using
 508  * amdgpu_fence_driver_start_ring().
 509  * Returns 0 for success.
 510  */
 511 int amdgpu_fence_driver_init(struct amdgpu_device *adev)
 512 {
 513         return 0;
 514 }
 515
 516 /**
 517  * amdgpu_fence_driver_fini - tear down the fence driver
 518  * for all possible rings.
 519  *
 520  * @adev: amdgpu device pointer
 521  *
 522  * Tear down the fence driver for all possible rings (all asics).
 523  */
 524 void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
 525 {
 526         unsigned i, j;
 527         int r;
 528
 529         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 530                 struct amdgpu_ring *ring = adev->rings[i];
 531
 532                 if (!ring || !ring->fence_drv.initialized)
 533                         continue;
 534                 if (!ring->no_scheduler)
 535                         drm_sched_fini(&ring->sched);
 536                 r = amdgpu_fence_wait_empty(ring);
 537                 if (r) {
 538                         /* no need to trigger GPU reset as we are unloading */
 539                         amdgpu_fence_driver_force_completion(ring);
 540                 }
 541                 if (ring->fence_drv.irq_src)
 542                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 543                                        ring->fence_drv.irq_type);
 544
 545                 del_timer_sync(&ring->fence_drv.fallback_timer);
 546                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 547                         dma_fence_put(ring->fence_drv.fences[j]);
 548                 kfree(ring->fence_drv.fences);
 549                 ring->fence_drv.fences = NULL;
 550                 ring->fence_drv.initialized = false;
 551         }
 552 }
 553
 554 /**
 555  * amdgpu_fence_driver_suspend - suspend the fence driver
 556  * for all possible rings.
 557  *
 558  * @adev: amdgpu device pointer
 559  *
 560  * Suspend the fence driver for all possible rings (all asics).
 561  */
 562 void amdgpu_fence_driver_suspend(struct amdgpu_device *adev)
 563 {
 564         int i, r;
 565
 566         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 567                 struct amdgpu_ring *ring = adev->rings[i];
 568                 if (!ring || !ring->fence_drv.initialized)
 569                         continue;
 570
 571                 /* wait for gpu to finish processing current batch */
 572                 r = amdgpu_fence_wait_empty(ring);
 573                 if (r) {
 574                         /* delay GPU reset to resume */
 575                         amdgpu_fence_driver_force_completion(ring);
 576                 }
 577
 578                 /* disable the interrupt */
 579                 if (ring->fence_drv.irq_src)
 580                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 581                                        ring->fence_drv.irq_type);
 582         }
 583 }
 584
 585 /**
 586  * amdgpu_fence_driver_resume - resume the fence driver
 587  * for all possible rings.
 588  *
 589  * @adev: amdgpu device pointer
 590  *
 591  * Resume the fence driver for all possible rings (all asics).
 592  * Not all asics have all rings, so each asic will only
 593  * start the fence driver on the rings it has using
 594  * amdgpu_fence_driver_start_ring().
 595  * Returns 0 for success.
 596  */
 597 void amdgpu_fence_driver_resume(struct amdgpu_device *adev)
 598 {
 599         int i;
 600
 601         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 602                 struct amdgpu_ring *ring = adev->rings[i];
 603                 if (!ring || !ring->fence_drv.initialized)
 604                         continue;
 605
 606                 /* enable the interrupt */
 607                 if (ring->fence_drv.irq_src)
 608                         amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 609                                        ring->fence_drv.irq_type);
 610         }
 611 }
 612
 613 /**
 614  * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 615  *
 616  * @ring: fence of the ring to signal
 617  *
 618  */
 619 void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 620 {
 621         amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 622         amdgpu_fence_process(ring);
 623 }
 624
 625 /*
 626  * Common fence implementation
 627  */
 628
 629 static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 630 {
 631         return "amdgpu";
 632 }
 633
 634 static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 635 {
 636         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 637         return (const char *)fence->ring->name;
 638 }
 639
 640 /**
 641  * amdgpu_fence_enable_signaling - enable signalling on fence
 642  * @f: fence
 643  *
 644  * This function is called with fence_queue lock held, and adds a callback
 645  * to fence_queue that checks if this fence is signaled, and if so it
 646  * signals the fence and removes itself.
 647  */
 648 static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 649 {
 650         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 651         struct amdgpu_ring *ring = fence->ring;
 652
 653         if (!timer_pending(&ring->fence_drv.fallback_timer))
 654                 amdgpu_fence_schedule_fallback(ring);
 655
 656         DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
 657
 658         return true;
 659 }
 660
 661 /**
 662  * amdgpu_fence_free - free up the fence memory
 663  *
 664  * @rcu: RCU callback head
 665  *
 666  * Free up the fence memory after the RCU grace period.
 667  */
 668 static void amdgpu_fence_free(struct rcu_head *rcu)
 669 {
 670         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 671         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 672         kmem_cache_free(amdgpu_fence_slab, fence);
 673 }
 674
 675 /**
 676  * amdgpu_fence_release - callback that fence can be freed
 677  *
 678  * @f: fence
 679  *
 680  * This function is called when the reference count becomes zero.
 681  * It just RCU schedules freeing up the fence.
 682  */
 683 static void amdgpu_fence_release(struct dma_fence *f)
 684 {
 685         call_rcu(&f->rcu, amdgpu_fence_free);
 686 }
 687
 688 static const struct dma_fence_ops amdgpu_fence_ops = {
 689         .get_driver_name = amdgpu_fence_get_driver_name,
 690         .get_timeline_name = amdgpu_fence_get_timeline_name,
 691         .enable_signaling = amdgpu_fence_enable_signaling,
 692         .release = amdgpu_fence_release,
 693 };
 694
 695 /*
 696  * Fence debugfs
 697  */
 698 #if defined(CONFIG_DEBUG_FS)
 699 static int amdgpu_debugfs_fence_info_show(struct seq_file *m, void *unused)
 700 {
 701         struct amdgpu_device *adev = (struct amdgpu_device *)m->private;
 702         int i;
 703
 704         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 705                 struct amdgpu_ring *ring = adev->rings[i];
 706                 if (!ring || !ring->fence_drv.initialized)
 707                         continue;
 708
 709                 amdgpu_fence_process(ring);
 710
 711                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 712                 seq_printf(m, "Last signaled fence          0x%08x\n",
 713                            atomic_read(&ring->fence_drv.last_seq));
 714                 seq_printf(m, "Last emitted                 0x%08x\n",
 715                            ring->fence_drv.sync_seq);
 716
 717                 if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
 718                     ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
 719                         seq_printf(m, "Last signaled trailing fence 0x%08x\n",
 720                                    le32_to_cpu(*ring->trail_fence_cpu_addr));
 721                         seq_printf(m, "Last emitted                 0x%08x\n",
 722                                    ring->trail_seq);
 723                 }
 724
 725                 if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 726                         continue;
 727
 728                 /* set in CP_VMID_PREEMPT and preemption occurred */
 729                 seq_printf(m, "Last preempted               0x%08x\n",
 730                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 731                 /* set in CP_VMID_RESET and reset occurred */
 732                 seq_printf(m, "Last reset                   0x%08x\n",
 733                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 734                 /* Both preemption and reset occurred */
 735                 seq_printf(m, "Last both                    0x%08x\n",
 736                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 737         }
 738         return 0;
 739 }
 740
 741 /*
 742  * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 743  *
 744  * Manually trigger a gpu reset at the next fence wait.
 745  */
 746 static int gpu_recover_get(void *data, u64 *val)
 747 {
 748         struct amdgpu_device *adev = (struct amdgpu_device *)data;
 749         struct drm_device *dev = adev_to_drm(adev);
 750         int r;
 751
 752         r = pm_runtime_get_sync(dev->dev);
 753         if (r < 0) {
 754                 pm_runtime_put_autosuspend(dev->dev);
 755                 return 0;
 756         }
 757
 758         *val = amdgpu_device_gpu_recover(adev, NULL);
 759
 760         pm_runtime_mark_last_busy(dev->dev);
 761         pm_runtime_put_autosuspend(dev->dev);
 762
 763         return 0;
 764 }
 765
 766 DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 767 DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 768                          "%lld\n");
 769
 770 #endif
 771
 772 void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 773 {
 774 #if defined(CONFIG_DEBUG_FS)
 775         struct drm_minor *minor = adev_to_drm(adev)->primary;
 776         struct dentry *root = minor->debugfs_root;
 777
 778         debugfs_create_file("amdgpu_fence_info", 0444, root, adev,
 779                             &amdgpu_debugfs_fence_info_fops);
 780
 781         if (!amdgpu_sriov_vf(adev))
 782                 debugfs_create_file("amdgpu_gpu_recover", 0444, root, adev,
 783                                     &amdgpu_debugfs_gpu_recover_fops);
 784 #endif
 785 }
 786