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