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         trace_amdgpu_runpm_reference_dumps(1, __func__);
 185         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 186         if (unlikely(rcu_dereference_protected(*ptr, 1))) {
 187                 struct dma_fence *old;
 188
 189                 rcu_read_lock();
 190                 old = dma_fence_get_rcu_safe(ptr);
 191                 rcu_read_unlock();
 192
 193                 if (old) {
 194                         r = dma_fence_wait(old, false);
 195                         dma_fence_put(old);
 196                         if (r)
 197                                 return r;
 198                 }
 199         }
 200
 201         to_amdgpu_fence(fence)->start_timestamp = ktime_get();
 202
 203         /* This function can't be called concurrently anyway, otherwise
 204          * emitting the fence would mess up the hardware ring buffer.
 205          */
 206         rcu_assign_pointer(*ptr, dma_fence_get(fence));
 207
 208         *f = fence;
 209
 210         return 0;
 211 }
 212
 213 /**
 214  * amdgpu_fence_emit_polling - emit a fence on the requeste ring
 215  *
 216  * @ring: ring the fence is associated with
 217  * @s: resulting sequence number
 218  * @timeout: the timeout for waiting in usecs
 219  *
 220  * Emits a fence command on the requested ring (all asics).
 221  * Used For polling fence.
 222  * Returns 0 on success, -ENOMEM on failure.
 223  */
 224 int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
 225                               uint32_t timeout)
 226 {
 227         uint32_t seq;
 228         signed long r;
 229
 230         if (!s)
 231                 return -EINVAL;
 232
 233         seq = ++ring->fence_drv.sync_seq;
 234         r = amdgpu_fence_wait_polling(ring,
 235                                       seq - ring->fence_drv.num_fences_mask,
 236                                       timeout);
 237         if (r < 1)
 238                 return -ETIMEDOUT;
 239
 240         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 241                                seq, 0);
 242
 243         *s = seq;
 244
 245         return 0;
 246 }
 247
 248 /**
 249  * amdgpu_fence_schedule_fallback - schedule fallback check
 250  *
 251  * @ring: pointer to struct amdgpu_ring
 252  *
 253  * Start a timer as fallback to our interrupts.
 254  */
 255 static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
 256 {
 257         mod_timer(&ring->fence_drv.fallback_timer,
 258                   jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
 259 }
 260
 261 /**
 262  * amdgpu_fence_process - check for fence activity
 263  *
 264  * @ring: pointer to struct amdgpu_ring
 265  *
 266  * Checks the current fence value and calculates the last
 267  * signalled fence value. Wakes the fence queue if the
 268  * sequence number has increased.
 269  *
 270  * Returns true if fence was processed
 271  */
 272 bool amdgpu_fence_process(struct amdgpu_ring *ring)
 273 {
 274         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 275         struct amdgpu_device *adev = ring->adev;
 276         uint32_t seq, last_seq;
 277
 278         do {
 279                 last_seq = atomic_read(&ring->fence_drv.last_seq);
 280                 seq = amdgpu_fence_read(ring);
 281
 282         } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 283
 284         if (del_timer(&ring->fence_drv.fallback_timer) &&
 285             seq != ring->fence_drv.sync_seq)
 286                 amdgpu_fence_schedule_fallback(ring);
 287
 288         if (unlikely(seq == last_seq))
 289                 return false;
 290
 291         last_seq &= drv->num_fences_mask;
 292         seq &= drv->num_fences_mask;
 293
 294         do {
 295                 struct dma_fence *fence, **ptr;
 296
 297                 ++last_seq;
 298                 last_seq &= drv->num_fences_mask;
 299                 ptr = &drv->fences[last_seq];
 300
 301                 /* There is always exactly one thread signaling this fence slot */
 302                 fence = rcu_dereference_protected(*ptr, 1);
 303                 RCU_INIT_POINTER(*ptr, NULL);
 304
 305                 if (!fence)
 306                         continue;
 307
 308                 dma_fence_signal(fence);
 309                 dma_fence_put(fence);
 310                 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 311                 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 312                 trace_amdgpu_runpm_reference_dumps(0, __func__);
 313         } while (last_seq != seq);
 314
 315         return true;
 316 }
 317
 318 /**
 319  * amdgpu_fence_fallback - fallback for hardware interrupts
 320  *
 321  * @t: timer context used to obtain the pointer to ring structure
 322  *
 323  * Checks for fence activity.
 324  */
 325 static void amdgpu_fence_fallback(struct timer_list *t)
 326 {
 327         struct amdgpu_ring *ring = from_timer(ring, t,
 328                                               fence_drv.fallback_timer);
 329
 330         if (amdgpu_fence_process(ring))
 331                 DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name);
 332 }
 333
 334 /**
 335  * amdgpu_fence_wait_empty - wait for all fences to signal
 336  *
 337  * @ring: ring index the fence is associated with
 338  *
 339  * Wait for all fences on the requested ring to signal (all asics).
 340  * Returns 0 if the fences have passed, error for all other cases.
 341  */
 342 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 343 {
 344         uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
 345         struct dma_fence *fence, **ptr;
 346         int r;
 347
 348         if (!seq)
 349                 return 0;
 350
 351         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 352         rcu_read_lock();
 353         fence = rcu_dereference(*ptr);
 354         if (!fence || !dma_fence_get_rcu(fence)) {
 355                 rcu_read_unlock();
 356                 return 0;
 357         }
 358         rcu_read_unlock();
 359
 360         r = dma_fence_wait(fence, false);
 361         dma_fence_put(fence);
 362         return r;
 363 }
 364
 365 /**
 366  * amdgpu_fence_wait_polling - busy wait for givn sequence number
 367  *
 368  * @ring: ring index the fence is associated with
 369  * @wait_seq: sequence number to wait
 370  * @timeout: the timeout for waiting in usecs
 371  *
 372  * Wait for all fences on the requested ring to signal (all asics).
 373  * Returns left time if no timeout, 0 or minus if timeout.
 374  */
 375 signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 376                                       uint32_t wait_seq,
 377                                       signed long timeout)
 378 {
 379
 380         while ((int32_t)(wait_seq - amdgpu_fence_read(ring)) > 0 && timeout > 0) {
 381                 udelay(2);
 382                 timeout -= 2;
 383         }
 384         return timeout > 0 ? timeout : 0;
 385 }
 386 /**
 387  * amdgpu_fence_count_emitted - get the count of emitted fences
 388  *
 389  * @ring: ring the fence is associated with
 390  *
 391  * Get the number of fences emitted on the requested ring (all asics).
 392  * Returns the number of emitted fences on the ring.  Used by the
 393  * dynpm code to ring track activity.
 394  */
 395 unsigned int amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 396 {
 397         uint64_t emitted;
 398
 399         /* We are not protected by ring lock when reading the last sequence
 400          * but it's ok to report slightly wrong fence count here.
 401          */
 402         emitted = 0x100000000ull;
 403         emitted -= atomic_read(&ring->fence_drv.last_seq);
 404         emitted += READ_ONCE(ring->fence_drv.sync_seq);
 405         return lower_32_bits(emitted);
 406 }
 407
 408 /**
 409  * amdgpu_fence_last_unsignaled_time_us - the time fence emitted until now
 410  * @ring: ring the fence is associated with
 411  *
 412  * Find the earliest fence unsignaled until now, calculate the time delta
 413  * between the time fence emitted and now.
 414  */
 415 u64 amdgpu_fence_last_unsignaled_time_us(struct amdgpu_ring *ring)
 416 {
 417         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 418         struct dma_fence *fence;
 419         uint32_t last_seq, sync_seq;
 420
 421         last_seq = atomic_read(&ring->fence_drv.last_seq);
 422         sync_seq = READ_ONCE(ring->fence_drv.sync_seq);
 423         if (last_seq == sync_seq)
 424                 return 0;
 425
 426         ++last_seq;
 427         last_seq &= drv->num_fences_mask;
 428         fence = drv->fences[last_seq];
 429         if (!fence)
 430                 return 0;
 431
 432         return ktime_us_delta(ktime_get(),
 433                 to_amdgpu_fence(fence)->start_timestamp);
 434 }
 435
 436 /**
 437  * amdgpu_fence_update_start_timestamp - update the timestamp of the fence
 438  * @ring: ring the fence is associated with
 439  * @seq: the fence seq number to update.
 440  * @timestamp: the start timestamp to update.
 441  *
 442  * The function called at the time the fence and related ib is about to
 443  * resubmit to gpu in MCBP scenario. Thus we do not consider race condition
 444  * with amdgpu_fence_process to modify the same fence.
 445  */
 446 void amdgpu_fence_update_start_timestamp(struct amdgpu_ring *ring, uint32_t seq, ktime_t timestamp)
 447 {
 448         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 449         struct dma_fence *fence;
 450
 451         seq &= drv->num_fences_mask;
 452         fence = drv->fences[seq];
 453         if (!fence)
 454                 return;
 455
 456         to_amdgpu_fence(fence)->start_timestamp = timestamp;
 457 }
 458
 459 /**
 460  * amdgpu_fence_driver_start_ring - make the fence driver
 461  * ready for use on the requested ring.
 462  *
 463  * @ring: ring to start the fence driver on
 464  * @irq_src: interrupt source to use for this ring
 465  * @irq_type: interrupt type to use for this ring
 466  *
 467  * Make the fence driver ready for processing (all asics).
 468  * Not all asics have all rings, so each asic will only
 469  * start the fence driver on the rings it has.
 470  * Returns 0 for success, errors for failure.
 471  */
 472 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 473                                    struct amdgpu_irq_src *irq_src,
 474                                    unsigned int irq_type)
 475 {
 476         struct amdgpu_device *adev = ring->adev;
 477         uint64_t index;
 478
 479         if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 480                 ring->fence_drv.cpu_addr = ring->fence_cpu_addr;
 481                 ring->fence_drv.gpu_addr = ring->fence_gpu_addr;
 482         } else {
 483                 /* put fence directly behind firmware */
 484                 index = ALIGN(adev->uvd.fw->size, 8);
 485                 ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 486                 ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 487         }
 488         amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 489
 490         ring->fence_drv.irq_src = irq_src;
 491         ring->fence_drv.irq_type = irq_type;
 492         ring->fence_drv.initialized = true;
 493
 494         DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
 495                       ring->name, ring->fence_drv.gpu_addr);
 496         return 0;
 497 }
 498
 499 /**
 500  * amdgpu_fence_driver_init_ring - init the fence driver
 501  * for the requested ring.
 502  *
 503  * @ring: ring to init the fence driver on
 504  *
 505  * Init the fence driver for the requested ring (all asics).
 506  * Helper function for amdgpu_fence_driver_init().
 507  */
 508 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 509 {
 510         struct amdgpu_device *adev = ring->adev;
 511
 512         if (!adev)
 513                 return -EINVAL;
 514
 515         if (!is_power_of_2(ring->num_hw_submission))
 516                 return -EINVAL;
 517
 518         ring->fence_drv.cpu_addr = NULL;
 519         ring->fence_drv.gpu_addr = 0;
 520         ring->fence_drv.sync_seq = 0;
 521         atomic_set(&ring->fence_drv.last_seq, 0);
 522         ring->fence_drv.initialized = false;
 523
 524         timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 525
 526         ring->fence_drv.num_fences_mask = ring->num_hw_submission * 2 - 1;
 527         spin_lock_init(&ring->fence_drv.lock);
 528         ring->fence_drv.fences = kcalloc(ring->num_hw_submission * 2, sizeof(void *),
 529                                          GFP_KERNEL);
 530
 531         if (!ring->fence_drv.fences)
 532                 return -ENOMEM;
 533
 534         return 0;
 535 }
 536
 537 /**
 538  * amdgpu_fence_driver_sw_init - init the fence driver
 539  * for all possible rings.
 540  *
 541  * @adev: amdgpu device pointer
 542  *
 543  * Init the fence driver for all possible rings (all asics).
 544  * Not all asics have all rings, so each asic will only
 545  * start the fence driver on the rings it has using
 546  * amdgpu_fence_driver_start_ring().
 547  * Returns 0 for success.
 548  */
 549 int amdgpu_fence_driver_sw_init(struct amdgpu_device *adev)
 550 {
 551         return 0;
 552 }
 553
 554 /**
 555  * amdgpu_fence_need_ring_interrupt_restore - helper function to check whether
 556  * fence driver interrupts need to be restored.
 557  *
 558  * @ring: ring that to be checked
 559  *
 560  * Interrupts for rings that belong to GFX IP don't need to be restored
 561  * when the target power state is s0ix.
 562  *
 563  * Return true if need to restore interrupts, false otherwise.
 564  */
 565 static bool amdgpu_fence_need_ring_interrupt_restore(struct amdgpu_ring *ring)
 566 {
 567         struct amdgpu_device *adev = ring->adev;
 568         bool is_gfx_power_domain = false;
 569
 570         switch (ring->funcs->type) {
 571         case AMDGPU_RING_TYPE_SDMA:
 572         /* SDMA 5.x+ is part of GFX power domain so it's covered by GFXOFF */
 573                 if (amdgpu_ip_version(adev, SDMA0_HWIP, 0) >=
 574                     IP_VERSION(5, 0, 0))
 575                         is_gfx_power_domain = true;
 576                 break;
 577         case AMDGPU_RING_TYPE_GFX:
 578         case AMDGPU_RING_TYPE_COMPUTE:
 579         case AMDGPU_RING_TYPE_KIQ:
 580         case AMDGPU_RING_TYPE_MES:
 581                 is_gfx_power_domain = true;
 582                 break;
 583         default:
 584                 break;
 585         }
 586
 587         return !(adev->in_s0ix && is_gfx_power_domain);
 588 }
 589
 590 /**
 591  * amdgpu_fence_driver_hw_fini - tear down the fence driver
 592  * for all possible rings.
 593  *
 594  * @adev: amdgpu device pointer
 595  *
 596  * Tear down the fence driver for all possible rings (all asics).
 597  */
 598 void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev)
 599 {
 600         int i, r;
 601
 602         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 603                 struct amdgpu_ring *ring = adev->rings[i];
 604
 605                 if (!ring || !ring->fence_drv.initialized)
 606                         continue;
 607
 608                 /* You can't wait for HW to signal if it's gone */
 609                 if (!drm_dev_is_unplugged(adev_to_drm(adev)))
 610                         r = amdgpu_fence_wait_empty(ring);
 611                 else
 612                         r = -ENODEV;
 613                 /* no need to trigger GPU reset as we are unloading */
 614                 if (r)
 615                         amdgpu_fence_driver_force_completion(ring);
 616
 617                 if (!drm_dev_is_unplugged(adev_to_drm(adev)) &&
 618                     ring->fence_drv.irq_src &&
 619                     amdgpu_fence_need_ring_interrupt_restore(ring))
 620                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 621                                        ring->fence_drv.irq_type);
 622
 623                 del_timer_sync(&ring->fence_drv.fallback_timer);
 624         }
 625 }
 626
 627 /* Will either stop and flush handlers for amdgpu interrupt or reanble it */
 628 void amdgpu_fence_driver_isr_toggle(struct amdgpu_device *adev, bool stop)
 629 {
 630         int i;
 631
 632         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 633                 struct amdgpu_ring *ring = adev->rings[i];
 634
 635                 if (!ring || !ring->fence_drv.initialized || !ring->fence_drv.irq_src)
 636                         continue;
 637
 638                 if (stop)
 639                         disable_irq(adev->irq.irq);
 640                 else
 641                         enable_irq(adev->irq.irq);
 642         }
 643 }
 644
 645 void amdgpu_fence_driver_sw_fini(struct amdgpu_device *adev)
 646 {
 647         unsigned int i, j;
 648
 649         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 650                 struct amdgpu_ring *ring = adev->rings[i];
 651
 652                 if (!ring || !ring->fence_drv.initialized)
 653                         continue;
 654
 655                 /*
 656                  * Notice we check for sched.ops since there's some
 657                  * override on the meaning of sched.ready by amdgpu.
 658                  * The natural check would be sched.ready, which is
 659                  * set as drm_sched_init() finishes...
 660                  */
 661                 if (ring->sched.ops)
 662                         drm_sched_fini(&ring->sched);
 663
 664                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 665                         dma_fence_put(ring->fence_drv.fences[j]);
 666                 kfree(ring->fence_drv.fences);
 667                 ring->fence_drv.fences = NULL;
 668                 ring->fence_drv.initialized = false;
 669         }
 670 }
 671
 672 /**
 673  * amdgpu_fence_driver_hw_init - enable the fence driver
 674  * for all possible rings.
 675  *
 676  * @adev: amdgpu device pointer
 677  *
 678  * Enable the fence driver for all possible rings (all asics).
 679  * Not all asics have all rings, so each asic will only
 680  * start the fence driver on the rings it has using
 681  * amdgpu_fence_driver_start_ring().
 682  * Returns 0 for success.
 683  */
 684 void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev)
 685 {
 686         int i;
 687
 688         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 689                 struct amdgpu_ring *ring = adev->rings[i];
 690
 691                 if (!ring || !ring->fence_drv.initialized)
 692                         continue;
 693
 694                 /* enable the interrupt */
 695                 if (ring->fence_drv.irq_src &&
 696                     amdgpu_fence_need_ring_interrupt_restore(ring))
 697                         amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 698                                        ring->fence_drv.irq_type);
 699         }
 700 }
 701
 702 /**
 703  * amdgpu_fence_driver_clear_job_fences - clear job embedded fences of ring
 704  *
 705  * @ring: fence of the ring to be cleared
 706  *
 707  */
 708 void amdgpu_fence_driver_clear_job_fences(struct amdgpu_ring *ring)
 709 {
 710         int i;
 711         struct dma_fence *old, **ptr;
 712
 713         for (i = 0; i <= ring->fence_drv.num_fences_mask; i++) {
 714                 ptr = &ring->fence_drv.fences[i];
 715                 old = rcu_dereference_protected(*ptr, 1);
 716                 if (old && old->ops == &amdgpu_job_fence_ops) {
 717                         struct amdgpu_job *job;
 718
 719                         /* For non-scheduler bad job, i.e. failed ib test, we need to signal
 720                          * it right here or we won't be able to track them in fence_drv
 721                          * and they will remain unsignaled during sa_bo free.
 722                          */
 723                         job = container_of(old, struct amdgpu_job, hw_fence);
 724                         if (!job->base.s_fence && !dma_fence_is_signaled(old))
 725                                 dma_fence_signal(old);
 726                         RCU_INIT_POINTER(*ptr, NULL);
 727                         dma_fence_put(old);
 728                 }
 729         }
 730 }
 731
 732 /**
 733  * amdgpu_fence_driver_set_error - set error code on fences
 734  * @ring: the ring which contains the fences
 735  * @error: the error code to set
 736  *
 737  * Set an error code to all the fences pending on the ring.
 738  */
 739 void amdgpu_fence_driver_set_error(struct amdgpu_ring *ring, int error)
 740 {
 741         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 742         unsigned long flags;
 743
 744         spin_lock_irqsave(&drv->lock, flags);
 745         for (unsigned int i = 0; i <= drv->num_fences_mask; ++i) {
 746                 struct dma_fence *fence;
 747
 748                 fence = rcu_dereference_protected(drv->fences[i],
 749                                                   lockdep_is_held(&drv->lock));
 750                 if (fence && !dma_fence_is_signaled_locked(fence))
 751                         dma_fence_set_error(fence, error);
 752         }
 753         spin_unlock_irqrestore(&drv->lock, flags);
 754 }
 755
 756 /**
 757  * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 758  *
 759  * @ring: fence of the ring to signal
 760  *
 761  */
 762 void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 763 {
 764         amdgpu_fence_driver_set_error(ring, -ECANCELED);
 765         amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 766         amdgpu_fence_process(ring);
 767 }
 768
 769 /*
 770  * Common fence implementation
 771  */
 772
 773 static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 774 {
 775         return "amdgpu";
 776 }
 777
 778 static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 779 {
 780         return (const char *)to_amdgpu_fence(f)->ring->name;
 781 }
 782
 783 static const char *amdgpu_job_fence_get_timeline_name(struct dma_fence *f)
 784 {
 785         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 786
 787         return (const char *)to_amdgpu_ring(job->base.sched)->name;
 788 }
 789
 790 /**
 791  * amdgpu_fence_enable_signaling - enable signalling on fence
 792  * @f: fence
 793  *
 794  * This function is called with fence_queue lock held, and adds a callback
 795  * to fence_queue that checks if this fence is signaled, and if so it
 796  * signals the fence and removes itself.
 797  */
 798 static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 799 {
 800         if (!timer_pending(&to_amdgpu_fence(f)->ring->fence_drv.fallback_timer))
 801                 amdgpu_fence_schedule_fallback(to_amdgpu_fence(f)->ring);
 802
 803         return true;
 804 }
 805
 806 /**
 807  * amdgpu_job_fence_enable_signaling - enable signalling on job fence
 808  * @f: fence
 809  *
 810  * This is the simliar function with amdgpu_fence_enable_signaling above, it
 811  * only handles the job embedded fence.
 812  */
 813 static bool amdgpu_job_fence_enable_signaling(struct dma_fence *f)
 814 {
 815         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 816
 817         if (!timer_pending(&to_amdgpu_ring(job->base.sched)->fence_drv.fallback_timer))
 818                 amdgpu_fence_schedule_fallback(to_amdgpu_ring(job->base.sched));
 819
 820         return true;
 821 }
 822
 823 /**
 824  * amdgpu_fence_free - free up the fence memory
 825  *
 826  * @rcu: RCU callback head
 827  *
 828  * Free up the fence memory after the RCU grace period.
 829  */
 830 static void amdgpu_fence_free(struct rcu_head *rcu)
 831 {
 832         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 833
 834         /* free fence_slab if it's separated fence*/
 835         kmem_cache_free(amdgpu_fence_slab, to_amdgpu_fence(f));
 836 }
 837
 838 /**
 839  * amdgpu_job_fence_free - free up the job with embedded fence
 840  *
 841  * @rcu: RCU callback head
 842  *
 843  * Free up the job with embedded fence after the RCU grace period.
 844  */
 845 static void amdgpu_job_fence_free(struct rcu_head *rcu)
 846 {
 847         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 848
 849         /* free job if fence has a parent job */
 850         kfree(container_of(f, struct amdgpu_job, hw_fence));
 851 }
 852
 853 /**
 854  * amdgpu_fence_release - callback that fence can be freed
 855  *
 856  * @f: fence
 857  *
 858  * This function is called when the reference count becomes zero.
 859  * It just RCU schedules freeing up the fence.
 860  */
 861 static void amdgpu_fence_release(struct dma_fence *f)
 862 {
 863         call_rcu(&f->rcu, amdgpu_fence_free);
 864 }
 865
 866 /**
 867  * amdgpu_job_fence_release - callback that job embedded fence can be freed
 868  *
 869  * @f: fence
 870  *
 871  * This is the simliar function with amdgpu_fence_release above, it
 872  * only handles the job embedded fence.
 873  */
 874 static void amdgpu_job_fence_release(struct dma_fence *f)
 875 {
 876         call_rcu(&f->rcu, amdgpu_job_fence_free);
 877 }
 878
 879 static const struct dma_fence_ops amdgpu_fence_ops = {
 880         .get_driver_name = amdgpu_fence_get_driver_name,
 881         .get_timeline_name = amdgpu_fence_get_timeline_name,
 882         .enable_signaling = amdgpu_fence_enable_signaling,
 883         .release = amdgpu_fence_release,
 884 };
 885
 886 static const struct dma_fence_ops amdgpu_job_fence_ops = {
 887         .get_driver_name = amdgpu_fence_get_driver_name,
 888         .get_timeline_name = amdgpu_job_fence_get_timeline_name,
 889         .enable_signaling = amdgpu_job_fence_enable_signaling,
 890         .release = amdgpu_job_fence_release,
 891 };
 892
 893 /*
 894  * Fence debugfs
 895  */
 896 #if defined(CONFIG_DEBUG_FS)
 897 static int amdgpu_debugfs_fence_info_show(struct seq_file *m, void *unused)
 898 {
 899         struct amdgpu_device *adev = m->private;
 900         int i;
 901
 902         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 903                 struct amdgpu_ring *ring = adev->rings[i];
 904
 905                 if (!ring || !ring->fence_drv.initialized)
 906                         continue;
 907
 908                 amdgpu_fence_process(ring);
 909
 910                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 911                 seq_printf(m, "Last signaled fence          0x%08x\n",
 912                            atomic_read(&ring->fence_drv.last_seq));
 913                 seq_printf(m, "Last emitted                 0x%08x\n",
 914                            ring->fence_drv.sync_seq);
 915
 916                 if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
 917                     ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
 918                         seq_printf(m, "Last signaled trailing fence 0x%08x\n",
 919                                    le32_to_cpu(*ring->trail_fence_cpu_addr));
 920                         seq_printf(m, "Last emitted                 0x%08x\n",
 921                                    ring->trail_seq);
 922                 }
 923
 924                 if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 925                         continue;
 926
 927                 /* set in CP_VMID_PREEMPT and preemption occurred */
 928                 seq_printf(m, "Last preempted               0x%08x\n",
 929                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 930                 /* set in CP_VMID_RESET and reset occurred */
 931                 seq_printf(m, "Last reset                   0x%08x\n",
 932                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 933                 /* Both preemption and reset occurred */
 934                 seq_printf(m, "Last both                    0x%08x\n",
 935                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 936         }
 937         return 0;
 938 }
 939
 940 /*
 941  * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 942  *
 943  * Manually trigger a gpu reset at the next fence wait.
 944  */
 945 static int gpu_recover_get(void *data, u64 *val)
 946 {
 947         struct amdgpu_device *adev = (struct amdgpu_device *)data;
 948         struct drm_device *dev = adev_to_drm(adev);
 949         int r;
 950
 951         r = pm_runtime_get_sync(dev->dev);
 952         if (r < 0) {
 953                 pm_runtime_put_autosuspend(dev->dev);
 954                 return 0;
 955         }
 956
 957         if (amdgpu_reset_domain_schedule(adev->reset_domain, &adev->reset_work))
 958                 flush_work(&adev->reset_work);
 959
 960         *val = atomic_read(&adev->reset_domain->reset_res);
 961
 962         pm_runtime_mark_last_busy(dev->dev);
 963         pm_runtime_put_autosuspend(dev->dev);
 964
 965         return 0;
 966 }
 967
 968 DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 969 DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 970                          "%lld\n");
 971
 972 static void amdgpu_debugfs_reset_work(struct work_struct *work)
 973 {
 974         struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 975                                                   reset_work);
 976
 977         struct amdgpu_reset_context reset_context;
 978
 979         memset(&reset_context, 0, sizeof(reset_context));
 980
 981         reset_context.method = AMD_RESET_METHOD_NONE;
 982         reset_context.reset_req_dev = adev;
 983         set_bit(AMDGPU_NEED_FULL_RESET, &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