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 <drm/drm_drv.h>
  40 #include "amdgpu.h"
  41 #include "amdgpu_trace.h"
  42 #include "amdgpu_reset.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 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 const struct dma_fence_ops amdgpu_job_fence_ops;
  82 static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  83 {
  84         struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
  85
  86         if (__f->base.ops == &amdgpu_fence_ops ||
  87             __f->base.ops == &amdgpu_job_fence_ops)
  88                 return __f;
  89
  90         return NULL;
  91 }
  92
  93 /**
  94  * amdgpu_fence_write - write a fence value
  95  *
  96  * @ring: ring the fence is associated with
  97  * @seq: sequence number to write
  98  *
  99  * Writes a fence value to memory (all asics).
 100  */
 101 static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq)
 102 {
 103         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 104
 105         if (drv->cpu_addr)
 106                 *drv->cpu_addr = cpu_to_le32(seq);
 107 }
 108
 109 /**
 110  * amdgpu_fence_read - read a fence value
 111  *
 112  * @ring: ring the fence is associated with
 113  *
 114  * Reads a fence value from memory (all asics).
 115  * Returns the value of the fence read from memory.
 116  */
 117 static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
 118 {
 119         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 120         u32 seq = 0;
 121
 122         if (drv->cpu_addr)
 123                 seq = le32_to_cpu(*drv->cpu_addr);
 124         else
 125                 seq = atomic_read(&drv->last_seq);
 126
 127         return seq;
 128 }
 129
 130 /**
 131  * amdgpu_fence_emit - emit a fence on the requested ring
 132  *
 133  * @ring: ring the fence is associated with
 134  * @f: resulting fence object
 135  * @job: job the fence is embedded in
 136  * @flags: flags to pass into the subordinate .emit_fence() call
 137  *
 138  * Emits a fence command on the requested ring (all asics).
 139  * Returns 0 on success, -ENOMEM on failure.
 140  */
 141 int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amdgpu_job *job,
 142                       unsigned flags)
 143 {
 144         struct amdgpu_device *adev = ring->adev;
 145         struct dma_fence *fence;
 146         struct amdgpu_fence *am_fence;
 147         struct dma_fence __rcu **ptr;
 148         uint32_t seq;
 149         int r;
 150
 151         if (job == NULL) {
 152                 /* create a sperate hw fence */
 153                 am_fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_ATOMIC);
 154                 if (am_fence == NULL)
 155                         return -ENOMEM;
 156                 fence = &am_fence->base;
 157                 am_fence->ring = ring;
 158         } else {
 159                 /* take use of job-embedded fence */
 160                 fence = &job->hw_fence;
 161         }
 162
 163         seq = ++ring->fence_drv.sync_seq;
 164         if (job && job->job_run_counter) {
 165                 /* reinit seq for resubmitted jobs */
 166                 fence->seqno = seq;
 167                 /* TO be inline with external fence creation and other drivers */
 168                 dma_fence_get(fence);
 169         } else {
 170                 if (job) {
 171                         dma_fence_init(fence, &amdgpu_job_fence_ops,
 172                                        &ring->fence_drv.lock,
 173                                        adev->fence_context + ring->idx, seq);
 174                         /* Against remove in amdgpu_job_{free, free_cb} */
 175                         dma_fence_get(fence);
 176                 }
 177                 else
 178                         dma_fence_init(fence, &amdgpu_fence_ops,
 179                                        &ring->fence_drv.lock,
 180                                        adev->fence_context + ring->idx, seq);
 181         }
 182
 183         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 184                                seq, flags | AMDGPU_FENCE_FLAG_INT);
 185         pm_runtime_get_noresume(adev_to_drm(adev)->dev);
 186         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 187         if (unlikely(rcu_dereference_protected(*ptr, 1))) {
 188                 struct dma_fence *old;
 189
 190                 rcu_read_lock();
 191                 old = dma_fence_get_rcu_safe(ptr);
 192                 rcu_read_unlock();
 193
 194                 if (old) {
 195                         r = dma_fence_wait(old, false);
 196                         dma_fence_put(old);
 197                         if (r)
 198                                 return r;
 199                 }
 200         }
 201
 202         /* This function can't be called concurrently anyway, otherwise
 203          * emitting the fence would mess up the hardware ring buffer.
 204          */
 205         rcu_assign_pointer(*ptr, dma_fence_get(fence));
 206
 207         *f = fence;
 208
 209         return 0;
 210 }
 211
 212 /**
 213  * amdgpu_fence_emit_polling - emit a fence on the requeste ring
 214  *
 215  * @ring: ring the fence is associated with
 216  * @s: resulting sequence number
 217  * @timeout: the timeout for waiting in usecs
 218  *
 219  * Emits a fence command on the requested ring (all asics).
 220  * Used For polling fence.
 221  * Returns 0 on success, -ENOMEM on failure.
 222  */
 223 int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
 224                               uint32_t timeout)
 225 {
 226         uint32_t seq;
 227         signed long r;
 228
 229         if (!s)
 230                 return -EINVAL;
 231
 232         seq = ++ring->fence_drv.sync_seq;
 233         r = amdgpu_fence_wait_polling(ring,
 234                                       seq - ring->fence_drv.num_fences_mask,
 235                                       timeout);
 236         if (r < 1)
 237                 return -ETIMEDOUT;
 238
 239         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 240                                seq, 0);
 241
 242         *s = seq;
 243
 244         return 0;
 245 }
 246
 247 /**
 248  * amdgpu_fence_schedule_fallback - schedule fallback check
 249  *
 250  * @ring: pointer to struct amdgpu_ring
 251  *
 252  * Start a timer as fallback to our interrupts.
 253  */
 254 static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
 255 {
 256         mod_timer(&ring->fence_drv.fallback_timer,
 257                   jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
 258 }
 259
 260 /**
 261  * amdgpu_fence_process - check for fence activity
 262  *
 263  * @ring: pointer to struct amdgpu_ring
 264  *
 265  * Checks the current fence value and calculates the last
 266  * signalled fence value. Wakes the fence queue if the
 267  * sequence number has increased.
 268  *
 269  * Returns true if fence was processed
 270  */
 271 bool amdgpu_fence_process(struct amdgpu_ring *ring)
 272 {
 273         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 274         struct amdgpu_device *adev = ring->adev;
 275         uint32_t seq, last_seq;
 276
 277         do {
 278                 last_seq = atomic_read(&ring->fence_drv.last_seq);
 279                 seq = amdgpu_fence_read(ring);
 280
 281         } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 282
 283         if (del_timer(&ring->fence_drv.fallback_timer) &&
 284             seq != ring->fence_drv.sync_seq)
 285                 amdgpu_fence_schedule_fallback(ring);
 286
 287         if (unlikely(seq == last_seq))
 288                 return false;
 289
 290         last_seq &= drv->num_fences_mask;
 291         seq &= drv->num_fences_mask;
 292
 293         do {
 294                 struct dma_fence *fence, **ptr;
 295
 296                 ++last_seq;
 297                 last_seq &= drv->num_fences_mask;
 298                 ptr = &drv->fences[last_seq];
 299
 300                 /* There is always exactly one thread signaling this fence slot */
 301                 fence = rcu_dereference_protected(*ptr, 1);
 302                 RCU_INIT_POINTER(*ptr, NULL);
 303
 304                 if (!fence)
 305                         continue;
 306
 307                 dma_fence_signal(fence);
 308                 dma_fence_put(fence);
 309                 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 310                 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 311         } while (last_seq != seq);
 312
 313         return true;
 314 }
 315
 316 /**
 317  * amdgpu_fence_fallback - fallback for hardware interrupts
 318  *
 319  * @t: timer context used to obtain the pointer to ring structure
 320  *
 321  * Checks for fence activity.
 322  */
 323 static void amdgpu_fence_fallback(struct timer_list *t)
 324 {
 325         struct amdgpu_ring *ring = from_timer(ring, t,
 326                                               fence_drv.fallback_timer);
 327
 328         if (amdgpu_fence_process(ring))
 329                 DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name);
 330 }
 331
 332 /**
 333  * amdgpu_fence_wait_empty - wait for all fences to signal
 334  *
 335  * @ring: ring index the fence is associated with
 336  *
 337  * Wait for all fences on the requested ring to signal (all asics).
 338  * Returns 0 if the fences have passed, error for all other cases.
 339  */
 340 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 341 {
 342         uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
 343         struct dma_fence *fence, **ptr;
 344         int r;
 345
 346         if (!seq)
 347                 return 0;
 348
 349         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 350         rcu_read_lock();
 351         fence = rcu_dereference(*ptr);
 352         if (!fence || !dma_fence_get_rcu(fence)) {
 353                 rcu_read_unlock();
 354                 return 0;
 355         }
 356         rcu_read_unlock();
 357
 358         r = dma_fence_wait(fence, false);
 359         dma_fence_put(fence);
 360         return r;
 361 }
 362
 363 /**
 364  * amdgpu_fence_wait_polling - busy wait for givn sequence number
 365  *
 366  * @ring: ring index the fence is associated with
 367  * @wait_seq: sequence number to wait
 368  * @timeout: the timeout for waiting in usecs
 369  *
 370  * Wait for all fences on the requested ring to signal (all asics).
 371  * Returns left time if no timeout, 0 or minus if timeout.
 372  */
 373 signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 374                                       uint32_t wait_seq,
 375                                       signed long timeout)
 376 {
 377         uint32_t seq;
 378
 379         do {
 380                 seq = amdgpu_fence_read(ring);
 381                 udelay(5);
 382                 timeout -= 5;
 383         } while ((int32_t)(wait_seq - seq) > 0 && timeout > 0);
 384
 385         return timeout > 0 ? timeout : 0;
 386 }
 387 /**
 388  * amdgpu_fence_count_emitted - get the count of emitted fences
 389  *
 390  * @ring: ring the fence is associated with
 391  *
 392  * Get the number of fences emitted on the requested ring (all asics).
 393  * Returns the number of emitted fences on the ring.  Used by the
 394  * dynpm code to ring track activity.
 395  */
 396 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 397 {
 398         uint64_t emitted;
 399
 400         /* We are not protected by ring lock when reading the last sequence
 401          * but it's ok to report slightly wrong fence count here.
 402          */
 403         emitted = 0x100000000ull;
 404         emitted -= atomic_read(&ring->fence_drv.last_seq);
 405         emitted += READ_ONCE(ring->fence_drv.sync_seq);
 406         return lower_32_bits(emitted);
 407 }
 408
 409 /**
 410  * amdgpu_fence_driver_start_ring - make the fence driver
 411  * ready for use on the requested ring.
 412  *
 413  * @ring: ring to start the fence driver on
 414  * @irq_src: interrupt source to use for this ring
 415  * @irq_type: interrupt type to use for this ring
 416  *
 417  * Make the fence driver ready for processing (all asics).
 418  * Not all asics have all rings, so each asic will only
 419  * start the fence driver on the rings it has.
 420  * Returns 0 for success, errors for failure.
 421  */
 422 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 423                                    struct amdgpu_irq_src *irq_src,
 424                                    unsigned irq_type)
 425 {
 426         struct amdgpu_device *adev = ring->adev;
 427         uint64_t index;
 428
 429         if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 430                 ring->fence_drv.cpu_addr = ring->fence_cpu_addr;
 431                 ring->fence_drv.gpu_addr = ring->fence_gpu_addr;
 432         } else {
 433                 /* put fence directly behind firmware */
 434                 index = ALIGN(adev->uvd.fw->size, 8);
 435                 ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 436                 ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 437         }
 438         amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 439
 440         ring->fence_drv.irq_src = irq_src;
 441         ring->fence_drv.irq_type = irq_type;
 442         ring->fence_drv.initialized = true;
 443
 444         DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
 445                       ring->name, ring->fence_drv.gpu_addr);
 446         return 0;
 447 }
 448
 449 /**
 450  * amdgpu_fence_driver_init_ring - init the fence driver
 451  * for the requested ring.
 452  *
 453  * @ring: ring to init the fence driver on
 454  *
 455  * Init the fence driver for the requested ring (all asics).
 456  * Helper function for amdgpu_fence_driver_init().
 457  */
 458 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 459 {
 460         struct amdgpu_device *adev = ring->adev;
 461
 462         if (!adev)
 463                 return -EINVAL;
 464
 465         if (!is_power_of_2(ring->num_hw_submission))
 466                 return -EINVAL;
 467
 468         ring->fence_drv.cpu_addr = NULL;
 469         ring->fence_drv.gpu_addr = 0;
 470         ring->fence_drv.sync_seq = 0;
 471         atomic_set(&ring->fence_drv.last_seq, 0);
 472         ring->fence_drv.initialized = false;
 473
 474         timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 475
 476         ring->fence_drv.num_fences_mask = ring->num_hw_submission * 2 - 1;
 477         spin_lock_init(&ring->fence_drv.lock);
 478         ring->fence_drv.fences = kcalloc(ring->num_hw_submission * 2, sizeof(void *),
 479                                          GFP_KERNEL);
 480
 481         if (!ring->fence_drv.fences)
 482                 return -ENOMEM;
 483
 484         return 0;
 485 }
 486
 487 /**
 488  * amdgpu_fence_driver_sw_init - init the fence driver
 489  * for all possible rings.
 490  *
 491  * @adev: amdgpu device pointer
 492  *
 493  * Init the fence driver for all possible rings (all asics).
 494  * Not all asics have all rings, so each asic will only
 495  * start the fence driver on the rings it has using
 496  * amdgpu_fence_driver_start_ring().
 497  * Returns 0 for success.
 498  */
 499 int amdgpu_fence_driver_sw_init(struct amdgpu_device *adev)
 500 {
 501         return 0;
 502 }
 503
 504 /**
 505  * amdgpu_fence_driver_hw_fini - tear down the fence driver
 506  * for all possible rings.
 507  *
 508  * @adev: amdgpu device pointer
 509  *
 510  * Tear down the fence driver for all possible rings (all asics).
 511  */
 512 void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev)
 513 {
 514         int i, r;
 515
 516         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 517                 struct amdgpu_ring *ring = adev->rings[i];
 518
 519                 if (!ring || !ring->fence_drv.initialized)
 520                         continue;
 521
 522                 /* You can't wait for HW to signal if it's gone */
 523                 if (!drm_dev_is_unplugged(adev_to_drm(adev)))
 524                         r = amdgpu_fence_wait_empty(ring);
 525                 else
 526                         r = -ENODEV;
 527                 /* no need to trigger GPU reset as we are unloading */
 528                 if (r)
 529                         amdgpu_fence_driver_force_completion(ring);
 530
 531                 if (ring->fence_drv.irq_src)
 532                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 533                                        ring->fence_drv.irq_type);
 534
 535                 del_timer_sync(&ring->fence_drv.fallback_timer);
 536         }
 537 }
 538
 539 /* Will either stop and flush handlers for amdgpu interrupt or reanble it */
 540 void amdgpu_fence_driver_isr_toggle(struct amdgpu_device *adev, bool stop)
 541 {
 542         int i;
 543
 544         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 545                 struct amdgpu_ring *ring = adev->rings[i];
 546
 547                 if (!ring || !ring->fence_drv.initialized || !ring->fence_drv.irq_src)
 548                         continue;
 549
 550                 if (stop)
 551                         disable_irq(adev->irq.irq);
 552                 else
 553                         enable_irq(adev->irq.irq);
 554         }
 555 }
 556
 557 void amdgpu_fence_driver_sw_fini(struct amdgpu_device *adev)
 558 {
 559         unsigned int i, j;
 560
 561         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 562                 struct amdgpu_ring *ring = adev->rings[i];
 563
 564                 if (!ring || !ring->fence_drv.initialized)
 565                         continue;
 566
 567                 /*
 568                  * Notice we check for sched.ops since there's some
 569                  * override on the meaning of sched.ready by amdgpu.
 570                  * The natural check would be sched.ready, which is
 571                  * set as drm_sched_init() finishes...
 572                  */
 573                 if (ring->sched.ops)
 574                         drm_sched_fini(&ring->sched);
 575
 576                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 577                         dma_fence_put(ring->fence_drv.fences[j]);
 578                 kfree(ring->fence_drv.fences);
 579                 ring->fence_drv.fences = NULL;
 580                 ring->fence_drv.initialized = false;
 581         }
 582 }
 583
 584 /**
 585  * amdgpu_fence_driver_hw_init - enable the fence driver
 586  * for all possible rings.
 587  *
 588  * @adev: amdgpu device pointer
 589  *
 590  * Enable the fence driver for all possible rings (all asics).
 591  * Not all asics have all rings, so each asic will only
 592  * start the fence driver on the rings it has using
 593  * amdgpu_fence_driver_start_ring().
 594  * Returns 0 for success.
 595  */
 596 void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev)
 597 {
 598         int i;
 599
 600         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 601                 struct amdgpu_ring *ring = adev->rings[i];
 602                 if (!ring || !ring->fence_drv.initialized)
 603                         continue;
 604
 605                 /* enable the interrupt */
 606                 if (ring->fence_drv.irq_src)
 607                         amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 608                                        ring->fence_drv.irq_type);
 609         }
 610 }
 611
 612 /**
 613  * amdgpu_fence_driver_clear_job_fences - clear job embedded fences of ring
 614  *
 615  * @ring: fence of the ring to be cleared
 616  *
 617  */
 618 void amdgpu_fence_driver_clear_job_fences(struct amdgpu_ring *ring)
 619 {
 620         int i;
 621         struct dma_fence *old, **ptr;
 622
 623         for (i = 0; i <= ring->fence_drv.num_fences_mask; i++) {
 624                 ptr = &ring->fence_drv.fences[i];
 625                 old = rcu_dereference_protected(*ptr, 1);
 626                 if (old && old->ops == &amdgpu_job_fence_ops) {
 627                         struct amdgpu_job *job;
 628
 629                         /* For non-scheduler bad job, i.e. failed ib test, we need to signal
 630                          * it right here or we won't be able to track them in fence_drv
 631                          * and they will remain unsignaled during sa_bo free.
 632                          */
 633                         job = container_of(old, struct amdgpu_job, hw_fence);
 634                         if (!job->base.s_fence && !dma_fence_is_signaled(old))
 635                                 dma_fence_signal(old);
 636                         RCU_INIT_POINTER(*ptr, NULL);
 637                         dma_fence_put(old);
 638                 }
 639         }
 640 }
 641
 642 /**
 643  * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 644  *
 645  * @ring: fence of the ring to signal
 646  *
 647  */
 648 void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 649 {
 650         amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 651         amdgpu_fence_process(ring);
 652 }
 653
 654 /*
 655  * Common fence implementation
 656  */
 657
 658 static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 659 {
 660         return "amdgpu";
 661 }
 662
 663 static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 664 {
 665         return (const char *)to_amdgpu_fence(f)->ring->name;
 666 }
 667
 668 static const char *amdgpu_job_fence_get_timeline_name(struct dma_fence *f)
 669 {
 670         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 671
 672         return (const char *)to_amdgpu_ring(job->base.sched)->name;
 673 }
 674
 675 /**
 676  * amdgpu_fence_enable_signaling - enable signalling on fence
 677  * @f: fence
 678  *
 679  * This function is called with fence_queue lock held, and adds a callback
 680  * to fence_queue that checks if this fence is signaled, and if so it
 681  * signals the fence and removes itself.
 682  */
 683 static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 684 {
 685         if (!timer_pending(&to_amdgpu_fence(f)->ring->fence_drv.fallback_timer))
 686                 amdgpu_fence_schedule_fallback(to_amdgpu_fence(f)->ring);
 687
 688         return true;
 689 }
 690
 691 /**
 692  * amdgpu_job_fence_enable_signaling - enable signalling on job fence
 693  * @f: fence
 694  *
 695  * This is the simliar function with amdgpu_fence_enable_signaling above, it
 696  * only handles the job embedded fence.
 697  */
 698 static bool amdgpu_job_fence_enable_signaling(struct dma_fence *f)
 699 {
 700         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 701
 702         if (!timer_pending(&to_amdgpu_ring(job->base.sched)->fence_drv.fallback_timer))
 703                 amdgpu_fence_schedule_fallback(to_amdgpu_ring(job->base.sched));
 704
 705         return true;
 706 }
 707
 708 /**
 709  * amdgpu_fence_free - free up the fence memory
 710  *
 711  * @rcu: RCU callback head
 712  *
 713  * Free up the fence memory after the RCU grace period.
 714  */
 715 static void amdgpu_fence_free(struct rcu_head *rcu)
 716 {
 717         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 718
 719         /* free fence_slab if it's separated fence*/
 720         kmem_cache_free(amdgpu_fence_slab, to_amdgpu_fence(f));
 721 }
 722
 723 /**
 724  * amdgpu_job_fence_free - free up the job with embedded fence
 725  *
 726  * @rcu: RCU callback head
 727  *
 728  * Free up the job with embedded fence after the RCU grace period.
 729  */
 730 static void amdgpu_job_fence_free(struct rcu_head *rcu)
 731 {
 732         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 733
 734         /* free job if fence has a parent job */
 735         kfree(container_of(f, struct amdgpu_job, hw_fence));
 736 }
 737
 738 /**
 739  * amdgpu_fence_release - callback that fence can be freed
 740  *
 741  * @f: fence
 742  *
 743  * This function is called when the reference count becomes zero.
 744  * It just RCU schedules freeing up the fence.
 745  */
 746 static void amdgpu_fence_release(struct dma_fence *f)
 747 {
 748         call_rcu(&f->rcu, amdgpu_fence_free);
 749 }
 750
 751 /**
 752  * amdgpu_job_fence_release - callback that job embedded fence can be freed
 753  *
 754  * @f: fence
 755  *
 756  * This is the simliar function with amdgpu_fence_release above, it
 757  * only handles the job embedded fence.
 758  */
 759 static void amdgpu_job_fence_release(struct dma_fence *f)
 760 {
 761         call_rcu(&f->rcu, amdgpu_job_fence_free);
 762 }
 763
 764 static const struct dma_fence_ops amdgpu_fence_ops = {
 765         .get_driver_name = amdgpu_fence_get_driver_name,
 766         .get_timeline_name = amdgpu_fence_get_timeline_name,
 767         .enable_signaling = amdgpu_fence_enable_signaling,
 768         .release = amdgpu_fence_release,
 769 };
 770
 771 static const struct dma_fence_ops amdgpu_job_fence_ops = {
 772         .get_driver_name = amdgpu_fence_get_driver_name,
 773         .get_timeline_name = amdgpu_job_fence_get_timeline_name,
 774         .enable_signaling = amdgpu_job_fence_enable_signaling,
 775         .release = amdgpu_job_fence_release,
 776 };
 777
 778 /*
 779  * Fence debugfs
 780  */
 781 #if defined(CONFIG_DEBUG_FS)
 782 static int amdgpu_debugfs_fence_info_show(struct seq_file *m, void *unused)
 783 {
 784         struct amdgpu_device *adev = (struct amdgpu_device *)m->private;
 785         int i;
 786
 787         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 788                 struct amdgpu_ring *ring = adev->rings[i];
 789                 if (!ring || !ring->fence_drv.initialized)
 790                         continue;
 791
 792                 amdgpu_fence_process(ring);
 793
 794                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 795                 seq_printf(m, "Last signaled fence          0x%08x\n",
 796                            atomic_read(&ring->fence_drv.last_seq));
 797                 seq_printf(m, "Last emitted                 0x%08x\n",
 798                            ring->fence_drv.sync_seq);
 799
 800                 if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
 801                     ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
 802                         seq_printf(m, "Last signaled trailing fence 0x%08x\n",
 803                                    le32_to_cpu(*ring->trail_fence_cpu_addr));
 804                         seq_printf(m, "Last emitted                 0x%08x\n",
 805                                    ring->trail_seq);
 806                 }
 807
 808                 if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 809                         continue;
 810
 811                 /* set in CP_VMID_PREEMPT and preemption occurred */
 812                 seq_printf(m, "Last preempted               0x%08x\n",
 813                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 814                 /* set in CP_VMID_RESET and reset occurred */
 815                 seq_printf(m, "Last reset                   0x%08x\n",
 816                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 817                 /* Both preemption and reset occurred */
 818                 seq_printf(m, "Last both                    0x%08x\n",
 819                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 820         }
 821         return 0;
 822 }
 823
 824 /*
 825  * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 826  *
 827  * Manually trigger a gpu reset at the next fence wait.
 828  */
 829 static int gpu_recover_get(void *data, u64 *val)
 830 {
 831         struct amdgpu_device *adev = (struct amdgpu_device *)data;
 832         struct drm_device *dev = adev_to_drm(adev);
 833         int r;
 834
 835         r = pm_runtime_get_sync(dev->dev);
 836         if (r < 0) {
 837                 pm_runtime_put_autosuspend(dev->dev);
 838                 return 0;
 839         }
 840
 841         if (amdgpu_reset_domain_schedule(adev->reset_domain, &adev->reset_work))
 842                 flush_work(&adev->reset_work);
 843
 844         *val = atomic_read(&adev->reset_domain->reset_res);
 845
 846         pm_runtime_mark_last_busy(dev->dev);
 847         pm_runtime_put_autosuspend(dev->dev);
 848
 849         return 0;
 850 }
 851
 852 DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 853 DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 854                          "%lld\n");
 855
 856 static void amdgpu_debugfs_reset_work(struct work_struct *work)
 857 {
 858         struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 859                                                   reset_work);
 860
 861         struct amdgpu_reset_context reset_context;
 862         memset(&reset_context, 0, sizeof(reset_context));
 863
 864         reset_context.method = AMD_RESET_METHOD_NONE;
 865         reset_context.reset_req_dev = adev;
 866         set_bit(AMDGPU_NEED_FULL_RESET, &reset_context.flags);
 867
 868         amdgpu_device_gpu_recover(adev, NULL, &reset_context);
 869 }
 870
 871 #endif
 872
 873 void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 874 {
 875 #if defined(CONFIG_DEBUG_FS)
 876         struct drm_minor *minor = adev_to_drm(adev)->primary;
 877         struct dentry *root = minor->debugfs_root;
 878
 879         debugfs_create_file("amdgpu_fence_info", 0444, root, adev,
 880                             &amdgpu_debugfs_fence_info_fops);
 881
 882         if (!amdgpu_sriov_vf(adev)) {
 883
 884                 INIT_WORK(&adev->reset_work, amdgpu_debugfs_reset_work);
 885                 debugfs_create_file("amdgpu_gpu_recover", 0444, root, adev,
 886                                     &amdgpu_debugfs_gpu_recover_fops);
 887         }
 888 #endif
 889 }
 890