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 mark an event in the GPUs pipeline and are used
  46  * for GPU/CPU synchronization.  When the fence is written,
  47  * it is expected that all buffers associated with that fence
  48  * are no longer in use by the associated ring on the GPU and
  49  * that the relevant GPU caches have been flushed.
  50  */
  51
  52 struct amdgpu_fence {
  53         struct dma_fence base;
  54
  55         /* RB, DMA, etc. */
  56         struct amdgpu_ring              *ring;
  57         ktime_t                         start_timestamp;
  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(amdgpu_fence, SLAB_HWCACHE_ALIGN);
  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 const struct dma_fence_ops amdgpu_job_fence_ops;
  80 static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  81 {
  82         struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
  83
  84         if (__f->base.ops == &amdgpu_fence_ops ||
  85             __f->base.ops == &amdgpu_job_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  * @job: job the fence is embedded in
 134  * @flags: flags to pass into the subordinate .emit_fence() call
 135  *
 136  * Emits a fence command on the requested ring (all asics).
 137  * Returns 0 on success, -ENOMEM on failure.
 138  */
 139 int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amdgpu_job *job,
 140                       unsigned int flags)
 141 {
 142         struct amdgpu_device *adev = ring->adev;
 143         struct dma_fence *fence;
 144         struct amdgpu_fence *am_fence;
 145         struct dma_fence __rcu **ptr;
 146         uint32_t seq;
 147         int r;
 148
 149         if (job == NULL) {
 150                 /* create a sperate hw fence */
 151                 am_fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_ATOMIC);
 152                 if (am_fence == NULL)
 153                         return -ENOMEM;
 154                 fence = &am_fence->base;
 155                 am_fence->ring = ring;
 156         } else {
 157                 /* take use of job-embedded fence */
 158                 fence = &job->hw_fence;
 159         }
 160
 161         seq = ++ring->fence_drv.sync_seq;
 162         if (job && job->job_run_counter) {
 163                 /* reinit seq for resubmitted jobs */
 164                 fence->seqno = seq;
 165                 /* TO be inline with external fence creation and other drivers */
 166                 dma_fence_get(fence);
 167         } else {
 168                 if (job) {
 169                         dma_fence_init(fence, &amdgpu_job_fence_ops,
 170                                        &ring->fence_drv.lock,
 171                                        adev->fence_context + ring->idx, seq);
 172                         /* Against remove in amdgpu_job_{free, free_cb} */
 173                         dma_fence_get(fence);
 174                 } else {
 175                         dma_fence_init(fence, &amdgpu_fence_ops,
 176                                        &ring->fence_drv.lock,
 177                                        adev->fence_context + ring->idx, seq);
 178                 }
 179         }
 180
 181         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 182                                seq, flags | AMDGPU_FENCE_FLAG_INT);
 183         pm_runtime_get_noresume(adev_to_drm(adev)->dev);
 184         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 185         if (unlikely(rcu_dereference_protected(*ptr, 1))) {
 186                 struct dma_fence *old;
 187
 188                 rcu_read_lock();
 189                 old = dma_fence_get_rcu_safe(ptr);
 190                 rcu_read_unlock();
 191
 192                 if (old) {
 193                         r = dma_fence_wait(old, false);
 194                         dma_fence_put(old);
 195                         if (r)
 196                                 return r;
 197                 }
 198         }
 199
 200         to_amdgpu_fence(fence)->start_timestamp = ktime_get();
 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
 378         while ((int32_t)(wait_seq - amdgpu_fence_read(ring)) > 0 && timeout > 0) {
 379                 udelay(2);
 380                 timeout -= 2;
 381         }
 382         return timeout > 0 ? timeout : 0;
 383 }
 384 /**
 385  * amdgpu_fence_count_emitted - get the count of emitted fences
 386  *
 387  * @ring: ring the fence is associated with
 388  *
 389  * Get the number of fences emitted on the requested ring (all asics).
 390  * Returns the number of emitted fences on the ring.  Used by the
 391  * dynpm code to ring track activity.
 392  */
 393 unsigned int amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 394 {
 395         uint64_t emitted;
 396
 397         /* We are not protected by ring lock when reading the last sequence
 398          * but it's ok to report slightly wrong fence count here.
 399          */
 400         emitted = 0x100000000ull;
 401         emitted -= atomic_read(&ring->fence_drv.last_seq);
 402         emitted += READ_ONCE(ring->fence_drv.sync_seq);
 403         return lower_32_bits(emitted);
 404 }
 405
 406 /**
 407  * amdgpu_fence_last_unsignaled_time_us - the time fence emitted until now
 408  * @ring: ring the fence is associated with
 409  *
 410  * Find the earliest fence unsignaled until now, calculate the time delta
 411  * between the time fence emitted and now.
 412  */
 413 u64 amdgpu_fence_last_unsignaled_time_us(struct amdgpu_ring *ring)
 414 {
 415         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 416         struct dma_fence *fence;
 417         uint32_t last_seq, sync_seq;
 418
 419         last_seq = atomic_read(&ring->fence_drv.last_seq);
 420         sync_seq = READ_ONCE(ring->fence_drv.sync_seq);
 421         if (last_seq == sync_seq)
 422                 return 0;
 423
 424         ++last_seq;
 425         last_seq &= drv->num_fences_mask;
 426         fence = drv->fences[last_seq];
 427         if (!fence)
 428                 return 0;
 429
 430         return ktime_us_delta(ktime_get(),
 431                 to_amdgpu_fence(fence)->start_timestamp);
 432 }
 433
 434 /**
 435  * amdgpu_fence_update_start_timestamp - update the timestamp of the fence
 436  * @ring: ring the fence is associated with
 437  * @seq: the fence seq number to update.
 438  * @timestamp: the start timestamp to update.
 439  *
 440  * The function called at the time the fence and related ib is about to
 441  * resubmit to gpu in MCBP scenario. Thus we do not consider race condition
 442  * with amdgpu_fence_process to modify the same fence.
 443  */
 444 void amdgpu_fence_update_start_timestamp(struct amdgpu_ring *ring, uint32_t seq, ktime_t timestamp)
 445 {
 446         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 447         struct dma_fence *fence;
 448
 449         seq &= drv->num_fences_mask;
 450         fence = drv->fences[seq];
 451         if (!fence)
 452                 return;
 453
 454         to_amdgpu_fence(fence)->start_timestamp = timestamp;
 455 }
 456
 457 /**
 458  * amdgpu_fence_driver_start_ring - make the fence driver
 459  * ready for use on the requested ring.
 460  *
 461  * @ring: ring to start the fence driver on
 462  * @irq_src: interrupt source to use for this ring
 463  * @irq_type: interrupt type to use for this ring
 464  *
 465  * Make the fence driver ready for processing (all asics).
 466  * Not all asics have all rings, so each asic will only
 467  * start the fence driver on the rings it has.
 468  * Returns 0 for success, errors for failure.
 469  */
 470 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 471                                    struct amdgpu_irq_src *irq_src,
 472                                    unsigned int irq_type)
 473 {
 474         struct amdgpu_device *adev = ring->adev;
 475         uint64_t index;
 476
 477         if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 478                 ring->fence_drv.cpu_addr = ring->fence_cpu_addr;
 479                 ring->fence_drv.gpu_addr = ring->fence_gpu_addr;
 480         } else {
 481                 /* put fence directly behind firmware */
 482                 index = ALIGN(adev->uvd.fw->size, 8);
 483                 ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 484                 ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 485         }
 486         amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 487
 488         ring->fence_drv.irq_src = irq_src;
 489         ring->fence_drv.irq_type = irq_type;
 490         ring->fence_drv.initialized = true;
 491
 492         DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
 493                       ring->name, ring->fence_drv.gpu_addr);
 494         return 0;
 495 }
 496
 497 /**
 498  * amdgpu_fence_driver_init_ring - init the fence driver
 499  * for the requested ring.
 500  *
 501  * @ring: ring to init the fence driver on
 502  *
 503  * Init the fence driver for the requested ring (all asics).
 504  * Helper function for amdgpu_fence_driver_init().
 505  */
 506 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 507 {
 508         struct amdgpu_device *adev = ring->adev;
 509
 510         if (!adev)
 511                 return -EINVAL;
 512
 513         if (!is_power_of_2(ring->num_hw_submission))
 514                 return -EINVAL;
 515
 516         ring->fence_drv.cpu_addr = NULL;
 517         ring->fence_drv.gpu_addr = 0;
 518         ring->fence_drv.sync_seq = 0;
 519         atomic_set(&ring->fence_drv.last_seq, 0);
 520         ring->fence_drv.initialized = false;
 521
 522         timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 523
 524         ring->fence_drv.num_fences_mask = ring->num_hw_submission * 2 - 1;
 525         spin_lock_init(&ring->fence_drv.lock);
 526         ring->fence_drv.fences = kcalloc(ring->num_hw_submission * 2, sizeof(void *),
 527                                          GFP_KERNEL);
 528
 529         if (!ring->fence_drv.fences)
 530                 return -ENOMEM;
 531
 532         return 0;
 533 }
 534
 535 /**
 536  * amdgpu_fence_driver_sw_init - init the fence driver
 537  * for all possible rings.
 538  *
 539  * @adev: amdgpu device pointer
 540  *
 541  * Init the fence driver for all possible rings (all asics).
 542  * Not all asics have all rings, so each asic will only
 543  * start the fence driver on the rings it has using
 544  * amdgpu_fence_driver_start_ring().
 545  * Returns 0 for success.
 546  */
 547 int amdgpu_fence_driver_sw_init(struct amdgpu_device *adev)
 548 {
 549         return 0;
 550 }
 551
 552 /**
 553  * amdgpu_fence_need_ring_interrupt_restore - helper function to check whether
 554  * fence driver interrupts need to be restored.
 555  *
 556  * @ring: ring that to be checked
 557  *
 558  * Interrupts for rings that belong to GFX IP don't need to be restored
 559  * when the target power state is s0ix.
 560  *
 561  * Return true if need to restore interrupts, false otherwise.
 562  */
 563 static bool amdgpu_fence_need_ring_interrupt_restore(struct amdgpu_ring *ring)
 564 {
 565         struct amdgpu_device *adev = ring->adev;
 566         bool is_gfx_power_domain = false;
 567
 568         switch (ring->funcs->type) {
 569         case AMDGPU_RING_TYPE_SDMA:
 570         /* SDMA 5.x+ is part of GFX power domain so it's covered by GFXOFF */
 571                 if (amdgpu_ip_version(adev, SDMA0_HWIP, 0) >=
 572                     IP_VERSION(5, 0, 0))
 573                         is_gfx_power_domain = true;
 574                 break;
 575         case AMDGPU_RING_TYPE_GFX:
 576         case AMDGPU_RING_TYPE_COMPUTE:
 577         case AMDGPU_RING_TYPE_KIQ:
 578         case AMDGPU_RING_TYPE_MES:
 579                 is_gfx_power_domain = true;
 580                 break;
 581         default:
 582                 break;
 583         }
 584
 585         return !(adev->in_s0ix && is_gfx_power_domain);
 586 }
 587
 588 /**
 589  * amdgpu_fence_driver_hw_fini - tear down the fence driver
 590  * for all possible rings.
 591  *
 592  * @adev: amdgpu device pointer
 593  *
 594  * Tear down the fence driver for all possible rings (all asics).
 595  */
 596 void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev)
 597 {
 598         int i, r;
 599
 600         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 601                 struct amdgpu_ring *ring = adev->rings[i];
 602
 603                 if (!ring || !ring->fence_drv.initialized)
 604                         continue;
 605
 606                 /* You can't wait for HW to signal if it's gone */
 607                 if (!drm_dev_is_unplugged(adev_to_drm(adev)))
 608                         r = amdgpu_fence_wait_empty(ring);
 609                 else
 610                         r = -ENODEV;
 611                 /* no need to trigger GPU reset as we are unloading */
 612                 if (r)
 613                         amdgpu_fence_driver_force_completion(ring);
 614
 615                 if (!drm_dev_is_unplugged(adev_to_drm(adev)) &&
 616                     ring->fence_drv.irq_src &&
 617                     amdgpu_fence_need_ring_interrupt_restore(ring))
 618                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 619                                        ring->fence_drv.irq_type);
 620
 621                 del_timer_sync(&ring->fence_drv.fallback_timer);
 622         }
 623 }
 624
 625 /* Will either stop and flush handlers for amdgpu interrupt or reanble it */
 626 void amdgpu_fence_driver_isr_toggle(struct amdgpu_device *adev, bool stop)
 627 {
 628         int i;
 629
 630         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 631                 struct amdgpu_ring *ring = adev->rings[i];
 632
 633                 if (!ring || !ring->fence_drv.initialized || !ring->fence_drv.irq_src)
 634                         continue;
 635
 636                 if (stop)
 637                         disable_irq(adev->irq.irq);
 638                 else
 639                         enable_irq(adev->irq.irq);
 640         }
 641 }
 642
 643 void amdgpu_fence_driver_sw_fini(struct amdgpu_device *adev)
 644 {
 645         unsigned int i, j;
 646
 647         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 648                 struct amdgpu_ring *ring = adev->rings[i];
 649
 650                 if (!ring || !ring->fence_drv.initialized)
 651                         continue;
 652
 653                 /*
 654                  * Notice we check for sched.ops since there's some
 655                  * override on the meaning of sched.ready by amdgpu.
 656                  * The natural check would be sched.ready, which is
 657                  * set as drm_sched_init() finishes...
 658                  */
 659                 if (ring->sched.ops)
 660                         drm_sched_fini(&ring->sched);
 661
 662                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 663                         dma_fence_put(ring->fence_drv.fences[j]);
 664                 kfree(ring->fence_drv.fences);
 665                 ring->fence_drv.fences = NULL;
 666                 ring->fence_drv.initialized = false;
 667         }
 668 }
 669
 670 /**
 671  * amdgpu_fence_driver_hw_init - enable the fence driver
 672  * for all possible rings.
 673  *
 674  * @adev: amdgpu device pointer
 675  *
 676  * Enable the fence driver for all possible rings (all asics).
 677  * Not all asics have all rings, so each asic will only
 678  * start the fence driver on the rings it has using
 679  * amdgpu_fence_driver_start_ring().
 680  * Returns 0 for success.
 681  */
 682 void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev)
 683 {
 684         int i;
 685
 686         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 687                 struct amdgpu_ring *ring = adev->rings[i];
 688
 689                 if (!ring || !ring->fence_drv.initialized)
 690                         continue;
 691
 692                 /* enable the interrupt */
 693                 if (ring->fence_drv.irq_src &&
 694                     amdgpu_fence_need_ring_interrupt_restore(ring))
 695                         amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 696                                        ring->fence_drv.irq_type);
 697         }
 698 }
 699
 700 /**
 701  * amdgpu_fence_driver_clear_job_fences - clear job embedded fences of ring
 702  *
 703  * @ring: fence of the ring to be cleared
 704  *
 705  */
 706 void amdgpu_fence_driver_clear_job_fences(struct amdgpu_ring *ring)
 707 {
 708         int i;
 709         struct dma_fence *old, **ptr;
 710
 711         for (i = 0; i <= ring->fence_drv.num_fences_mask; i++) {
 712                 ptr = &ring->fence_drv.fences[i];
 713                 old = rcu_dereference_protected(*ptr, 1);
 714                 if (old && old->ops == &amdgpu_job_fence_ops) {
 715                         struct amdgpu_job *job;
 716
 717                         /* For non-scheduler bad job, i.e. failed ib test, we need to signal
 718                          * it right here or we won't be able to track them in fence_drv
 719                          * and they will remain unsignaled during sa_bo free.
 720                          */
 721                         job = container_of(old, struct amdgpu_job, hw_fence);
 722                         if (!job->base.s_fence && !dma_fence_is_signaled(old))
 723                                 dma_fence_signal(old);
 724                         RCU_INIT_POINTER(*ptr, NULL);
 725                         dma_fence_put(old);
 726                 }
 727         }
 728 }
 729
 730 /**
 731  * amdgpu_fence_driver_set_error - set error code on fences
 732  * @ring: the ring which contains the fences
 733  * @error: the error code to set
 734  *
 735  * Set an error code to all the fences pending on the ring.
 736  */
 737 void amdgpu_fence_driver_set_error(struct amdgpu_ring *ring, int error)
 738 {
 739         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 740         unsigned long flags;
 741
 742         spin_lock_irqsave(&drv->lock, flags);
 743         for (unsigned int i = 0; i <= drv->num_fences_mask; ++i) {
 744                 struct dma_fence *fence;
 745
 746                 fence = rcu_dereference_protected(drv->fences[i],
 747                                                   lockdep_is_held(&drv->lock));
 748                 if (fence && !dma_fence_is_signaled_locked(fence))
 749                         dma_fence_set_error(fence, error);
 750         }
 751         spin_unlock_irqrestore(&drv->lock, flags);
 752 }
 753
 754 /**
 755  * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 756  *
 757  * @ring: fence of the ring to signal
 758  *
 759  */
 760 void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 761 {
 762         amdgpu_fence_driver_set_error(ring, -ECANCELED);
 763         amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 764         amdgpu_fence_process(ring);
 765 }
 766
 767 /*
 768  * Common fence implementation
 769  */
 770
 771 static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 772 {
 773         return "amdgpu";
 774 }
 775
 776 static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 777 {
 778         return (const char *)to_amdgpu_fence(f)->ring->name;
 779 }
 780
 781 static const char *amdgpu_job_fence_get_timeline_name(struct dma_fence *f)
 782 {
 783         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 784
 785         return (const char *)to_amdgpu_ring(job->base.sched)->name;
 786 }
 787
 788 /**
 789  * amdgpu_fence_enable_signaling - enable signalling on fence
 790  * @f: fence
 791  *
 792  * This function is called with fence_queue lock held, and adds a callback
 793  * to fence_queue that checks if this fence is signaled, and if so it
 794  * signals the fence and removes itself.
 795  */
 796 static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 797 {
 798         if (!timer_pending(&to_amdgpu_fence(f)->ring->fence_drv.fallback_timer))
 799                 amdgpu_fence_schedule_fallback(to_amdgpu_fence(f)->ring);
 800
 801         return true;
 802 }
 803
 804 /**
 805  * amdgpu_job_fence_enable_signaling - enable signalling on job fence
 806  * @f: fence
 807  *
 808  * This is the simliar function with amdgpu_fence_enable_signaling above, it
 809  * only handles the job embedded fence.
 810  */
 811 static bool amdgpu_job_fence_enable_signaling(struct dma_fence *f)
 812 {
 813         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 814
 815         if (!timer_pending(&to_amdgpu_ring(job->base.sched)->fence_drv.fallback_timer))
 816                 amdgpu_fence_schedule_fallback(to_amdgpu_ring(job->base.sched));
 817
 818         return true;
 819 }
 820
 821 /**
 822  * amdgpu_fence_free - free up the fence memory
 823  *
 824  * @rcu: RCU callback head
 825  *
 826  * Free up the fence memory after the RCU grace period.
 827  */
 828 static void amdgpu_fence_free(struct rcu_head *rcu)
 829 {
 830         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 831
 832         /* free fence_slab if it's separated fence*/
 833         kmem_cache_free(amdgpu_fence_slab, to_amdgpu_fence(f));
 834 }
 835
 836 /**
 837  * amdgpu_job_fence_free - free up the job with embedded fence
 838  *
 839  * @rcu: RCU callback head
 840  *
 841  * Free up the job with embedded fence after the RCU grace period.
 842  */
 843 static void amdgpu_job_fence_free(struct rcu_head *rcu)
 844 {
 845         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 846
 847         /* free job if fence has a parent job */
 848         kfree(container_of(f, struct amdgpu_job, hw_fence));
 849 }
 850
 851 /**
 852  * amdgpu_fence_release - callback that fence can be freed
 853  *
 854  * @f: fence
 855  *
 856  * This function is called when the reference count becomes zero.
 857  * It just RCU schedules freeing up the fence.
 858  */
 859 static void amdgpu_fence_release(struct dma_fence *f)
 860 {
 861         call_rcu(&f->rcu, amdgpu_fence_free);
 862 }
 863
 864 /**
 865  * amdgpu_job_fence_release - callback that job embedded fence can be freed
 866  *
 867  * @f: fence
 868  *
 869  * This is the simliar function with amdgpu_fence_release above, it
 870  * only handles the job embedded fence.
 871  */
 872 static void amdgpu_job_fence_release(struct dma_fence *f)
 873 {
 874         call_rcu(&f->rcu, amdgpu_job_fence_free);
 875 }
 876
 877 static const struct dma_fence_ops amdgpu_fence_ops = {
 878         .get_driver_name = amdgpu_fence_get_driver_name,
 879         .get_timeline_name = amdgpu_fence_get_timeline_name,
 880         .enable_signaling = amdgpu_fence_enable_signaling,
 881         .release = amdgpu_fence_release,
 882 };
 883
 884 static const struct dma_fence_ops amdgpu_job_fence_ops = {
 885         .get_driver_name = amdgpu_fence_get_driver_name,
 886         .get_timeline_name = amdgpu_job_fence_get_timeline_name,
 887         .enable_signaling = amdgpu_job_fence_enable_signaling,
 888         .release = amdgpu_job_fence_release,
 889 };
 890
 891 /*
 892  * Fence debugfs
 893  */
 894 #if defined(CONFIG_DEBUG_FS)
 895 static int amdgpu_debugfs_fence_info_show(struct seq_file *m, void *unused)
 896 {
 897         struct amdgpu_device *adev = m->private;
 898         int i;
 899
 900         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 901                 struct amdgpu_ring *ring = adev->rings[i];
 902
 903                 if (!ring || !ring->fence_drv.initialized)
 904                         continue;
 905
 906                 amdgpu_fence_process(ring);
 907
 908                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 909                 seq_printf(m, "Last signaled fence          0x%08x\n",
 910                            atomic_read(&ring->fence_drv.last_seq));
 911                 seq_printf(m, "Last emitted                 0x%08x\n",
 912                            ring->fence_drv.sync_seq);
 913
 914                 if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
 915                     ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
 916                         seq_printf(m, "Last signaled trailing fence 0x%08x\n",
 917                                    le32_to_cpu(*ring->trail_fence_cpu_addr));
 918                         seq_printf(m, "Last emitted                 0x%08x\n",
 919                                    ring->trail_seq);
 920                 }
 921
 922                 if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 923                         continue;
 924
 925                 /* set in CP_VMID_PREEMPT and preemption occurred */
 926                 seq_printf(m, "Last preempted               0x%08x\n",
 927                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 928                 /* set in CP_VMID_RESET and reset occurred */
 929                 seq_printf(m, "Last reset                   0x%08x\n",
 930                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 931                 /* Both preemption and reset occurred */
 932                 seq_printf(m, "Last both                    0x%08x\n",
 933                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 934         }
 935         return 0;
 936 }
 937
 938 /*
 939  * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 940  *
 941  * Manually trigger a gpu reset at the next fence wait.
 942  */
 943 static int gpu_recover_get(void *data, u64 *val)
 944 {
 945         struct amdgpu_device *adev = (struct amdgpu_device *)data;
 946         struct drm_device *dev = adev_to_drm(adev);
 947         int r;
 948
 949         r = pm_runtime_get_sync(dev->dev);
 950         if (r < 0) {
 951                 pm_runtime_put_autosuspend(dev->dev);
 952                 return 0;
 953         }
 954
 955         if (amdgpu_reset_domain_schedule(adev->reset_domain, &adev->reset_work))
 956                 flush_work(&adev->reset_work);
 957
 958         *val = atomic_read(&adev->reset_domain->reset_res);
 959
 960         pm_runtime_mark_last_busy(dev->dev);
 961         pm_runtime_put_autosuspend(dev->dev);
 962
 963         return 0;
 964 }
 965
 966 DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 967 DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 968                          "%lld\n");
 969
 970 static void amdgpu_debugfs_reset_work(struct work_struct *work)
 971 {
 972         struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 973                                                   reset_work);
 974
 975         struct amdgpu_reset_context reset_context;
 976
 977         memset(&reset_context, 0, sizeof(reset_context));
 978
 979         reset_context.method = AMD_RESET_METHOD_NONE;
 980         reset_context.reset_req_dev = adev;
 981         reset_context.src = AMDGPU_RESET_SRC_USER;
 982         set_bit(AMDGPU_NEED_FULL_RESET, &reset_context.flags);
 983         set_bit(AMDGPU_SKIP_COREDUMP, &reset_context.flags);
 984
 985         amdgpu_device_gpu_recover(adev, NULL, &reset_context);
 986 }
 987
 988 #endif
 989
 990 void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 991 {
 992 #if defined(CONFIG_DEBUG_FS)
 993         struct drm_minor *minor = adev_to_drm(adev)->primary;
 994         struct dentry *root = minor->debugfs_root;
 995
 996         debugfs_create_file("amdgpu_fence_info", 0444, root, adev,
 997                             &amdgpu_debugfs_fence_info_fops);
 998
 999         if (!amdgpu_sriov_vf(adev)) {
1000
1001                 INIT_WORK(&adev->reset_work, amdgpu_debugfs_reset_work);
1002                 debugfs_create_file("amdgpu_gpu_recover", 0444, root, adev,
1003                                     &amdgpu_debugfs_gpu_recover_fops);
1004         }
1005 #endif
1006 }
1007