drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <[email protected]>
  29  *    Dave Airlie
  30  */
  31 #include <linux/seq_file.h>
  32 #include <linux/atomic.h>
  33 #include <linux/wait.h>
  34 #include <linux/kref.h>
  35 #include <linux/slab.h>
  36 #include <linux/firmware.h>
  37 #include <drm/drmP.h>
  38 #include "amdgpu.h"
  39 #include "amdgpu_trace.h"
  40
  41 /*
  42  * Fences
  43  * Fences mark an event in the GPUs pipeline and are used
  44  * for GPU/CPU synchronization.  When the fence is written,
  45  * it is expected that all buffers associated with that fence
  46  * are no longer in use by the associated ring on the GPU and
  47  * that the the relevant GPU caches have been flushed.
  48  */
  49
  50 /**
  51  * amdgpu_fence_write - write a fence value
  52  *
  53  * @ring: ring the fence is associated with
  54  * @seq: sequence number to write
  55  *
  56  * Writes a fence value to memory (all asics).
  57  */
  58 static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq)
  59 {
  60         struct amdgpu_fence_driver *drv = &ring->fence_drv;
  61
  62         if (drv->cpu_addr)
  63                 *drv->cpu_addr = cpu_to_le32(seq);
  64 }
  65
  66 /**
  67  * amdgpu_fence_read - read a fence value
  68  *
  69  * @ring: ring the fence is associated with
  70  *
  71  * Reads a fence value from memory (all asics).
  72  * Returns the value of the fence read from memory.
  73  */
  74 static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
  75 {
  76         struct amdgpu_fence_driver *drv = &ring->fence_drv;
  77         u32 seq = 0;
  78
  79         if (drv->cpu_addr)
  80                 seq = le32_to_cpu(*drv->cpu_addr);
  81         else
  82                 seq = lower_32_bits(atomic64_read(&drv->last_seq));
  83
  84         return seq;
  85 }
  86
  87 /**
  88  * amdgpu_fence_schedule_check - schedule lockup check
  89  *
  90  * @ring: pointer to struct amdgpu_ring
  91  *
  92  * Queues a delayed work item to check for lockups.
  93  */
  94 static void amdgpu_fence_schedule_check(struct amdgpu_ring *ring)
  95 {
  96         /*
  97          * Do not reset the timer here with mod_delayed_work,
  98          * this can livelock in an interaction with TTM delayed destroy.
  99          */
 100         queue_delayed_work(system_power_efficient_wq,
 101                 &ring->fence_drv.lockup_work,
 102                 AMDGPU_FENCE_JIFFIES_TIMEOUT);
 103 }
 104
 105 /**
 106  * amdgpu_fence_emit - emit a fence on the requested ring
 107  *
 108  * @ring: ring the fence is associated with
 109  * @owner: creator of the fence
 110  * @fence: amdgpu fence object
 111  *
 112  * Emits a fence command on the requested ring (all asics).
 113  * Returns 0 on success, -ENOMEM on failure.
 114  */
 115 int amdgpu_fence_emit(struct amdgpu_ring *ring, void *owner,
 116                       struct amdgpu_fence **fence)
 117 {
 118         struct amdgpu_device *adev = ring->adev;
 119
 120         /* we are protected by the ring emission mutex */
 121         *fence = kmalloc(sizeof(struct amdgpu_fence), GFP_KERNEL);
 122         if ((*fence) == NULL) {
 123                 return -ENOMEM;
 124         }
 125         (*fence)->seq = ++ring->fence_drv.sync_seq[ring->idx];
 126         (*fence)->ring = ring;
 127         (*fence)->owner = owner;
 128         fence_init(&(*fence)->base, &amdgpu_fence_ops,
 129                 &ring->fence_drv.fence_queue.lock,
 130                 adev->fence_context + ring->idx,
 131                 (*fence)->seq);
 132         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 133                                (*fence)->seq,
 134                                AMDGPU_FENCE_FLAG_INT);
 135         trace_amdgpu_fence_emit(ring->adev->ddev, ring->idx, (*fence)->seq);
 136         return 0;
 137 }
 138
 139 /**
 140  * amdgpu_fence_check_signaled - callback from fence_queue
 141  *
 142  * this function is called with fence_queue lock held, which is also used
 143  * for the fence locking itself, so unlocked variants are used for
 144  * fence_signal, and remove_wait_queue.
 145  */
 146 static int amdgpu_fence_check_signaled(wait_queue_t *wait, unsigned mode, int flags, void *key)
 147 {
 148         struct amdgpu_fence *fence;
 149         struct amdgpu_device *adev;
 150         u64 seq;
 151         int ret;
 152
 153         fence = container_of(wait, struct amdgpu_fence, fence_wake);
 154         adev = fence->ring->adev;
 155
 156         /*
 157          * We cannot use amdgpu_fence_process here because we're already
 158          * in the waitqueue, in a call from wake_up_all.
 159          */
 160         seq = atomic64_read(&fence->ring->fence_drv.last_seq);
 161         if (seq >= fence->seq) {
 162                 ret = fence_signal_locked(&fence->base);
 163                 if (!ret)
 164                         FENCE_TRACE(&fence->base, "signaled from irq context\n");
 165                 else
 166                         FENCE_TRACE(&fence->base, "was already signaled\n");
 167
 168                 __remove_wait_queue(&fence->ring->fence_drv.fence_queue, &fence->fence_wake);
 169                 fence_put(&fence->base);
 170         } else
 171                 FENCE_TRACE(&fence->base, "pending\n");
 172         return 0;
 173 }
 174
 175 /**
 176  * amdgpu_fence_activity - check for fence activity
 177  *
 178  * @ring: pointer to struct amdgpu_ring
 179  *
 180  * Checks the current fence value and calculates the last
 181  * signalled fence value. Returns true if activity occured
 182  * on the ring, and the fence_queue should be waken up.
 183  */
 184 static bool amdgpu_fence_activity(struct amdgpu_ring *ring)
 185 {
 186         uint64_t seq, last_seq, last_emitted;
 187         unsigned count_loop = 0;
 188         bool wake = false;
 189
 190         /* Note there is a scenario here for an infinite loop but it's
 191          * very unlikely to happen. For it to happen, the current polling
 192          * process need to be interrupted by another process and another
 193          * process needs to update the last_seq btw the atomic read and
 194          * xchg of the current process.
 195          *
 196          * More over for this to go in infinite loop there need to be
 197          * continuously new fence signaled ie amdgpu_fence_read needs
 198          * to return a different value each time for both the currently
 199          * polling process and the other process that xchg the last_seq
 200          * btw atomic read and xchg of the current process. And the
 201          * value the other process set as last seq must be higher than
 202          * the seq value we just read. Which means that current process
 203          * need to be interrupted after amdgpu_fence_read and before
 204          * atomic xchg.
 205          *
 206          * To be even more safe we count the number of time we loop and
 207          * we bail after 10 loop just accepting the fact that we might
 208          * have temporarly set the last_seq not to the true real last
 209          * seq but to an older one.
 210          */
 211         last_seq = atomic64_read(&ring->fence_drv.last_seq);
 212         do {
 213                 last_emitted = ring->fence_drv.sync_seq[ring->idx];
 214                 seq = amdgpu_fence_read(ring);
 215                 seq |= last_seq & 0xffffffff00000000LL;
 216                 if (seq < last_seq) {
 217                         seq &= 0xffffffff;
 218                         seq |= last_emitted & 0xffffffff00000000LL;
 219                 }
 220
 221                 if (seq <= last_seq || seq > last_emitted) {
 222                         break;
 223                 }
 224                 /* If we loop over we don't want to return without
 225                  * checking if a fence is signaled as it means that the
 226                  * seq we just read is different from the previous on.
 227                  */
 228                 wake = true;
 229                 last_seq = seq;
 230                 if ((count_loop++) > 10) {
 231                         /* We looped over too many time leave with the
 232                          * fact that we might have set an older fence
 233                          * seq then the current real last seq as signaled
 234                          * by the hw.
 235                          */
 236                         break;
 237                 }
 238         } while (atomic64_xchg(&ring->fence_drv.last_seq, seq) > seq);
 239
 240         if (seq < last_emitted)
 241                 amdgpu_fence_schedule_check(ring);
 242
 243         return wake;
 244 }
 245
 246 /**
 247  * amdgpu_fence_check_lockup - check for hardware lockup
 248  *
 249  * @work: delayed work item
 250  *
 251  * Checks for fence activity and if there is none probe
 252  * the hardware if a lockup occured.
 253  */
 254 static void amdgpu_fence_check_lockup(struct work_struct *work)
 255 {
 256         struct amdgpu_fence_driver *fence_drv;
 257         struct amdgpu_ring *ring;
 258
 259         fence_drv = container_of(work, struct amdgpu_fence_driver,
 260                                 lockup_work.work);
 261         ring = fence_drv->ring;
 262
 263         if (!down_read_trylock(&ring->adev->exclusive_lock)) {
 264                 /* just reschedule the check if a reset is going on */
 265                 amdgpu_fence_schedule_check(ring);
 266                 return;
 267         }
 268
 269         if (amdgpu_fence_activity(ring)) {
 270                 wake_up_all(&ring->fence_drv.fence_queue);
 271         }
 272         else if (amdgpu_ring_is_lockup(ring)) {
 273                 /* good news we believe it's a lockup */
 274                 dev_warn(ring->adev->dev, "GPU lockup (current fence id "
 275                         "0x%016llx last fence id 0x%016llx on ring %d)\n",
 276                         (uint64_t)atomic64_read(&fence_drv->last_seq),
 277                         fence_drv->sync_seq[ring->idx], ring->idx);
 278
 279                 /* remember that we need an reset */
 280                 ring->adev->needs_reset = true;
 281                 wake_up_all(&ring->fence_drv.fence_queue);
 282         }
 283         up_read(&ring->adev->exclusive_lock);
 284 }
 285
 286 /**
 287  * amdgpu_fence_process - process a fence
 288  *
 289  * @adev: amdgpu_device pointer
 290  * @ring: ring index the fence is associated with
 291  *
 292  * Checks the current fence value and wakes the fence queue
 293  * if the sequence number has increased (all asics).
 294  */
 295 void amdgpu_fence_process(struct amdgpu_ring *ring)
 296 {
 297         if (amdgpu_fence_activity(ring))
 298                 wake_up_all(&ring->fence_drv.fence_queue);
 299 }
 300
 301 /**
 302  * amdgpu_fence_seq_signaled - check if a fence sequence number has signaled
 303  *
 304  * @ring: ring the fence is associated with
 305  * @seq: sequence number
 306  *
 307  * Check if the last signaled fence sequnce number is >= the requested
 308  * sequence number (all asics).
 309  * Returns true if the fence has signaled (current fence value
 310  * is >= requested value) or false if it has not (current fence
 311  * value is < the requested value.  Helper function for
 312  * amdgpu_fence_signaled().
 313  */
 314 static bool amdgpu_fence_seq_signaled(struct amdgpu_ring *ring, u64 seq)
 315 {
 316         if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
 317                 return true;
 318
 319         /* poll new last sequence at least once */
 320         amdgpu_fence_process(ring);
 321         if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
 322                 return true;
 323
 324         return false;
 325 }
 326
 327 static bool amdgpu_fence_is_signaled(struct fence *f)
 328 {
 329         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 330         struct amdgpu_ring *ring = fence->ring;
 331         struct amdgpu_device *adev = ring->adev;
 332
 333         if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
 334                 return true;
 335
 336         if (down_read_trylock(&adev->exclusive_lock)) {
 337                 amdgpu_fence_process(ring);
 338                 up_read(&adev->exclusive_lock);
 339
 340                 if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
 341                         return true;
 342         }
 343         return false;
 344 }
 345
 346 /**
 347  * amdgpu_fence_enable_signaling - enable signalling on fence
 348  * @fence: fence
 349  *
 350  * This function is called with fence_queue lock held, and adds a callback
 351  * to fence_queue that checks if this fence is signaled, and if so it
 352  * signals the fence and removes itself.
 353  */
 354 static bool amdgpu_fence_enable_signaling(struct fence *f)
 355 {
 356         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 357         struct amdgpu_ring *ring = fence->ring;
 358
 359         if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
 360                 return false;
 361
 362         fence->fence_wake.flags = 0;
 363         fence->fence_wake.private = NULL;
 364         fence->fence_wake.func = amdgpu_fence_check_signaled;
 365         __add_wait_queue(&ring->fence_drv.fence_queue, &fence->fence_wake);
 366         fence_get(f);
 367         FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
 368         return true;
 369 }
 370
 371 /*
 372  * amdgpu_ring_wait_seq_timeout - wait for seq of the specific ring to signal
 373  * @ring: ring to wait on for the seq number
 374  * @seq: seq number wait for
 375  *
 376  * return value:
 377  * 0: seq signaled, and gpu not hang
 378  * -EDEADL: GPU hang detected
 379  * -EINVAL: some paramter is not valid
 380  */
 381 static int amdgpu_fence_ring_wait_seq(struct amdgpu_ring *ring, uint64_t seq)
 382 {
 383         struct amdgpu_device *adev = ring->adev;
 384         bool signaled = false;
 385
 386         BUG_ON(!ring);
 387         if (seq > ring->fence_drv.sync_seq[ring->idx])
 388                 return -EINVAL;
 389
 390         if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
 391                 return 0;
 392
 393         wait_event(ring->fence_drv.fence_queue, (
 394                    (signaled = amdgpu_fence_seq_signaled(ring, seq))
 395                    || adev->needs_reset));
 396
 397         if (signaled)
 398                 return 0;
 399         else
 400                 return -EDEADLK;
 401 }
 402
 403 /**
 404  * amdgpu_fence_wait_next - wait for the next fence to signal
 405  *
 406  * @adev: amdgpu device pointer
 407  * @ring: ring index the fence is associated with
 408  *
 409  * Wait for the next fence on the requested ring to signal (all asics).
 410  * Returns 0 if the next fence has passed, error for all other cases.
 411  * Caller must hold ring lock.
 412  */
 413 int amdgpu_fence_wait_next(struct amdgpu_ring *ring)
 414 {
 415         uint64_t seq = atomic64_read(&ring->fence_drv.last_seq) + 1ULL;
 416
 417         if (seq >= ring->fence_drv.sync_seq[ring->idx])
 418                 return -ENOENT;
 419
 420         return amdgpu_fence_ring_wait_seq(ring, seq);
 421 }
 422
 423 /**
 424  * amdgpu_fence_wait_empty - wait for all fences to signal
 425  *
 426  * @adev: amdgpu device pointer
 427  * @ring: ring index the fence is associated with
 428  *
 429  * Wait for all fences on the requested ring to signal (all asics).
 430  * Returns 0 if the fences have passed, error for all other cases.
 431  * Caller must hold ring lock.
 432  */
 433 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 434 {
 435         uint64_t seq = ring->fence_drv.sync_seq[ring->idx];
 436
 437         if (!seq)
 438                 return 0;
 439
 440         return amdgpu_fence_ring_wait_seq(ring, seq);
 441 }
 442
 443 /**
 444  * amdgpu_fence_ref - take a ref on a fence
 445  *
 446  * @fence: amdgpu fence object
 447  *
 448  * Take a reference on a fence (all asics).
 449  * Returns the fence.
 450  */
 451 struct amdgpu_fence *amdgpu_fence_ref(struct amdgpu_fence *fence)
 452 {
 453         fence_get(&fence->base);
 454         return fence;
 455 }
 456
 457 /**
 458  * amdgpu_fence_unref - remove a ref on a fence
 459  *
 460  * @fence: amdgpu fence object
 461  *
 462  * Remove a reference on a fence (all asics).
 463  */
 464 void amdgpu_fence_unref(struct amdgpu_fence **fence)
 465 {
 466         struct amdgpu_fence *tmp = *fence;
 467
 468         *fence = NULL;
 469         if (tmp)
 470                 fence_put(&tmp->base);
 471 }
 472
 473 /**
 474  * amdgpu_fence_count_emitted - get the count of emitted fences
 475  *
 476  * @ring: ring the fence is associated with
 477  *
 478  * Get the number of fences emitted on the requested ring (all asics).
 479  * Returns the number of emitted fences on the ring.  Used by the
 480  * dynpm code to ring track activity.
 481  */
 482 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 483 {
 484         uint64_t emitted;
 485
 486         /* We are not protected by ring lock when reading the last sequence
 487          * but it's ok to report slightly wrong fence count here.
 488          */
 489         amdgpu_fence_process(ring);
 490         emitted = ring->fence_drv.sync_seq[ring->idx]
 491                 - atomic64_read(&ring->fence_drv.last_seq);
 492         /* to avoid 32bits warp around */
 493         if (emitted > 0x10000000)
 494                 emitted = 0x10000000;
 495
 496         return (unsigned)emitted;
 497 }
 498
 499 /**
 500  * amdgpu_fence_need_sync - do we need a semaphore
 501  *
 502  * @fence: amdgpu fence object
 503  * @dst_ring: which ring to check against
 504  *
 505  * Check if the fence needs to be synced against another ring
 506  * (all asics).  If so, we need to emit a semaphore.
 507  * Returns true if we need to sync with another ring, false if
 508  * not.
 509  */
 510 bool amdgpu_fence_need_sync(struct amdgpu_fence *fence,
 511                             struct amdgpu_ring *dst_ring)
 512 {
 513         struct amdgpu_fence_driver *fdrv;
 514
 515         if (!fence)
 516                 return false;
 517
 518         if (fence->ring == dst_ring)
 519                 return false;
 520
 521         /* we are protected by the ring mutex */
 522         fdrv = &dst_ring->fence_drv;
 523         if (fence->seq <= fdrv->sync_seq[fence->ring->idx])
 524                 return false;
 525
 526         return true;
 527 }
 528
 529 /**
 530  * amdgpu_fence_note_sync - record the sync point
 531  *
 532  * @fence: amdgpu fence object
 533  * @dst_ring: which ring to check against
 534  *
 535  * Note the sequence number at which point the fence will
 536  * be synced with the requested ring (all asics).
 537  */
 538 void amdgpu_fence_note_sync(struct amdgpu_fence *fence,
 539                             struct amdgpu_ring *dst_ring)
 540 {
 541         struct amdgpu_fence_driver *dst, *src;
 542         unsigned i;
 543
 544         if (!fence)
 545                 return;
 546
 547         if (fence->ring == dst_ring)
 548                 return;
 549
 550         /* we are protected by the ring mutex */
 551         src = &fence->ring->fence_drv;
 552         dst = &dst_ring->fence_drv;
 553         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 554                 if (i == dst_ring->idx)
 555                         continue;
 556
 557                 dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);
 558         }
 559 }
 560
 561 /**
 562  * amdgpu_fence_driver_start_ring - make the fence driver
 563  * ready for use on the requested ring.
 564  *
 565  * @ring: ring to start the fence driver on
 566  * @irq_src: interrupt source to use for this ring
 567  * @irq_type: interrupt type to use for this ring
 568  *
 569  * Make the fence driver ready for processing (all asics).
 570  * Not all asics have all rings, so each asic will only
 571  * start the fence driver on the rings it has.
 572  * Returns 0 for success, errors for failure.
 573  */
 574 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 575                                    struct amdgpu_irq_src *irq_src,
 576                                    unsigned irq_type)
 577 {
 578         struct amdgpu_device *adev = ring->adev;
 579         uint64_t index;
 580
 581         if (ring != &adev->uvd.ring) {
 582                 ring->fence_drv.cpu_addr = &adev->wb.wb[ring->fence_offs];
 583                 ring->fence_drv.gpu_addr = adev->wb.gpu_addr + (ring->fence_offs * 4);
 584         } else {
 585                 /* put fence directly behind firmware */
 586                 index = ALIGN(adev->uvd.fw->size, 8);
 587                 ring->fence_drv.cpu_addr = adev->uvd.cpu_addr + index;
 588                 ring->fence_drv.gpu_addr = adev->uvd.gpu_addr + index;
 589         }
 590         amdgpu_fence_write(ring, atomic64_read(&ring->fence_drv.last_seq));
 591         amdgpu_irq_get(adev, irq_src, irq_type);
 592
 593         ring->fence_drv.irq_src = irq_src;
 594         ring->fence_drv.irq_type = irq_type;
 595         ring->fence_drv.initialized = true;
 596
 597         dev_info(adev->dev, "fence driver on ring %d use gpu addr 0x%016llx, "
 598                  "cpu addr 0x%p\n", ring->idx,
 599                  ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr);
 600         return 0;
 601 }
 602
 603 /**
 604  * amdgpu_fence_driver_init_ring - init the fence driver
 605  * for the requested ring.
 606  *
 607  * @ring: ring to init the fence driver on
 608  *
 609  * Init the fence driver for the requested ring (all asics).
 610  * Helper function for amdgpu_fence_driver_init().
 611  */
 612 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 613 {
 614         int i, r;
 615
 616         ring->fence_drv.cpu_addr = NULL;
 617         ring->fence_drv.gpu_addr = 0;
 618         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 619                 ring->fence_drv.sync_seq[i] = 0;
 620
 621         atomic64_set(&ring->fence_drv.last_seq, 0);
 622         ring->fence_drv.initialized = false;
 623
 624         INIT_DELAYED_WORK(&ring->fence_drv.lockup_work,
 625                         amdgpu_fence_check_lockup);
 626         ring->fence_drv.ring = ring;
 627
 628         init_waitqueue_head(&ring->fence_drv.fence_queue);
 629
 630         if (amdgpu_enable_scheduler) {
 631                 r = amd_sched_init(&ring->sched, &amdgpu_sched_ops,
 632                                    amdgpu_sched_hw_submission, ring->name);
 633                 if (r) {
 634                         DRM_ERROR("Failed to create scheduler on ring %s.\n",
 635                                   ring->name);
 636                         return r;
 637                 }
 638         }
 639
 640         return 0;
 641 }
 642
 643 /**
 644  * amdgpu_fence_driver_init - init the fence driver
 645  * for all possible rings.
 646  *
 647  * @adev: amdgpu device pointer
 648  *
 649  * Init the fence driver for all possible rings (all asics).
 650  * Not all asics have all rings, so each asic will only
 651  * start the fence driver on the rings it has using
 652  * amdgpu_fence_driver_start_ring().
 653  * Returns 0 for success.
 654  */
 655 int amdgpu_fence_driver_init(struct amdgpu_device *adev)
 656 {
 657         if (amdgpu_debugfs_fence_init(adev))
 658                 dev_err(adev->dev, "fence debugfs file creation failed\n");
 659
 660         return 0;
 661 }
 662
 663 /**
 664  * amdgpu_fence_driver_fini - tear down the fence driver
 665  * for all possible rings.
 666  *
 667  * @adev: amdgpu device pointer
 668  *
 669  * Tear down the fence driver for all possible rings (all asics).
 670  */
 671 void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
 672 {
 673         int i, r;
 674
 675         mutex_lock(&adev->ring_lock);
 676         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 677                 struct amdgpu_ring *ring = adev->rings[i];
 678                 if (!ring || !ring->fence_drv.initialized)
 679                         continue;
 680                 r = amdgpu_fence_wait_empty(ring);
 681                 if (r) {
 682                         /* no need to trigger GPU reset as we are unloading */
 683                         amdgpu_fence_driver_force_completion(adev);
 684                 }
 685                 wake_up_all(&ring->fence_drv.fence_queue);
 686                 amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 687                                ring->fence_drv.irq_type);
 688                 amd_sched_fini(&ring->sched);
 689                 ring->fence_drv.initialized = false;
 690         }
 691         mutex_unlock(&adev->ring_lock);
 692 }
 693
 694 /**
 695  * amdgpu_fence_driver_suspend - suspend the fence driver
 696  * for all possible rings.
 697  *
 698  * @adev: amdgpu device pointer
 699  *
 700  * Suspend the fence driver for all possible rings (all asics).
 701  */
 702 void amdgpu_fence_driver_suspend(struct amdgpu_device *adev)
 703 {
 704         int i, r;
 705
 706         mutex_lock(&adev->ring_lock);
 707         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 708                 struct amdgpu_ring *ring = adev->rings[i];
 709                 if (!ring || !ring->fence_drv.initialized)
 710                         continue;
 711
 712                 /* wait for gpu to finish processing current batch */
 713                 r = amdgpu_fence_wait_empty(ring);
 714                 if (r) {
 715                         /* delay GPU reset to resume */
 716                         amdgpu_fence_driver_force_completion(adev);
 717                 }
 718
 719                 /* disable the interrupt */
 720                 amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 721                                ring->fence_drv.irq_type);
 722         }
 723         mutex_unlock(&adev->ring_lock);
 724 }
 725
 726 /**
 727  * amdgpu_fence_driver_resume - resume the fence driver
 728  * for all possible rings.
 729  *
 730  * @adev: amdgpu device pointer
 731  *
 732  * Resume the fence driver for all possible rings (all asics).
 733  * Not all asics have all rings, so each asic will only
 734  * start the fence driver on the rings it has using
 735  * amdgpu_fence_driver_start_ring().
 736  * Returns 0 for success.
 737  */
 738 void amdgpu_fence_driver_resume(struct amdgpu_device *adev)
 739 {
 740         int i;
 741
 742         mutex_lock(&adev->ring_lock);
 743         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 744                 struct amdgpu_ring *ring = adev->rings[i];
 745                 if (!ring || !ring->fence_drv.initialized)
 746                         continue;
 747
 748                 /* enable the interrupt */
 749                 amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 750                                ring->fence_drv.irq_type);
 751         }
 752         mutex_unlock(&adev->ring_lock);
 753 }
 754
 755 /**
 756  * amdgpu_fence_driver_force_completion - force all fence waiter to complete
 757  *
 758  * @adev: amdgpu device pointer
 759  *
 760  * In case of GPU reset failure make sure no process keep waiting on fence
 761  * that will never complete.
 762  */
 763 void amdgpu_fence_driver_force_completion(struct amdgpu_device *adev)
 764 {
 765         int i;
 766
 767         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 768                 struct amdgpu_ring *ring = adev->rings[i];
 769                 if (!ring || !ring->fence_drv.initialized)
 770                         continue;
 771
 772                 amdgpu_fence_write(ring, ring->fence_drv.sync_seq[i]);
 773         }
 774 }
 775
 776
 777 /*
 778  * Fence debugfs
 779  */
 780 #if defined(CONFIG_DEBUG_FS)
 781 static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data)
 782 {
 783         struct drm_info_node *node = (struct drm_info_node *)m->private;
 784         struct drm_device *dev = node->minor->dev;
 785         struct amdgpu_device *adev = dev->dev_private;
 786         int i, j;
 787
 788         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 789                 struct amdgpu_ring *ring = adev->rings[i];
 790                 if (!ring || !ring->fence_drv.initialized)
 791                         continue;
 792
 793                 amdgpu_fence_process(ring);
 794
 795                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 796                 seq_printf(m, "Last signaled fence 0x%016llx\n",
 797                            (unsigned long long)atomic64_read(&ring->fence_drv.last_seq));
 798                 seq_printf(m, "Last emitted        0x%016llx\n",
 799                            ring->fence_drv.sync_seq[i]);
 800
 801                 for (j = 0; j < AMDGPU_MAX_RINGS; ++j) {
 802                         struct amdgpu_ring *other = adev->rings[j];
 803                         if (i != j && other && other->fence_drv.initialized &&
 804                             ring->fence_drv.sync_seq[j])
 805                                 seq_printf(m, "Last sync to ring %d 0x%016llx\n",
 806                                            j, ring->fence_drv.sync_seq[j]);
 807                 }
 808         }
 809         return 0;
 810 }
 811
 812 static struct drm_info_list amdgpu_debugfs_fence_list[] = {
 813         {"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL},
 814 };
 815 #endif
 816
 817 int amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 818 {
 819 #if defined(CONFIG_DEBUG_FS)
 820         return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list, 1);
 821 #else
 822         return 0;
 823 #endif
 824 }
 825
 826 static const char *amdgpu_fence_get_driver_name(struct fence *fence)
 827 {
 828         return "amdgpu";
 829 }
 830
 831 static const char *amdgpu_fence_get_timeline_name(struct fence *f)
 832 {
 833         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 834         return (const char *)fence->ring->name;
 835 }
 836
 837 static inline bool amdgpu_test_signaled(struct amdgpu_fence *fence)
 838 {
 839         return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
 840 }
 841
 842 static bool amdgpu_test_signaled_any(struct fence **fences, uint32_t count)
 843 {
 844         int idx;
 845         struct fence *fence;
 846
 847         for (idx = 0; idx < count; ++idx) {
 848                 fence = fences[idx];
 849                 if (fence) {
 850                         if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 851                                 return true;
 852                 }
 853         }
 854         return false;
 855 }
 856
 857 struct amdgpu_wait_cb {
 858         struct fence_cb base;
 859         struct task_struct *task;
 860 };
 861
 862 static void amdgpu_fence_wait_cb(struct fence *fence, struct fence_cb *cb)
 863 {
 864         struct amdgpu_wait_cb *wait =
 865                 container_of(cb, struct amdgpu_wait_cb, base);
 866         wake_up_process(wait->task);
 867 }
 868
 869 static signed long amdgpu_fence_default_wait(struct fence *f, bool intr,
 870                                              signed long t)
 871 {
 872         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 873         struct amdgpu_device *adev = fence->ring->adev;
 874
 875         return amdgpu_fence_wait_any(adev, &f, 1, intr, t);
 876 }
 877
 878 /**
 879  * Wait the fence array with timeout
 880  *
 881  * @adev:     amdgpu device
 882  * @array:    the fence array with amdgpu fence pointer
 883  * @count:    the number of the fence array
 884  * @intr:     when sleep, set the current task interruptable or not
 885  * @t:        timeout to wait
 886  *
 887  * It will return when any fence is signaled or timeout.
 888  */
 889 signed long amdgpu_fence_wait_any(struct amdgpu_device *adev,
 890                                   struct fence **array, uint32_t count,
 891                                   bool intr, signed long t)
 892 {
 893         struct amdgpu_wait_cb *cb;
 894         struct fence *fence;
 895         unsigned idx;
 896
 897         BUG_ON(!array);
 898
 899         cb = kcalloc(count, sizeof(struct amdgpu_wait_cb), GFP_KERNEL);
 900         if (cb == NULL) {
 901                 t = -ENOMEM;
 902                 goto err_free_cb;
 903         }
 904
 905         for (idx = 0; idx < count; ++idx) {
 906                 fence = array[idx];
 907                 if (fence) {
 908                         cb[idx].task = current;
 909                         if (fence_add_callback(fence,
 910                                         &cb[idx].base, amdgpu_fence_wait_cb)) {
 911                                 /* The fence is already signaled */
 912                                 goto fence_rm_cb;
 913                         }
 914                 }
 915         }
 916
 917         while (t > 0) {
 918                 if (intr)
 919                         set_current_state(TASK_INTERRUPTIBLE);
 920                 else
 921                         set_current_state(TASK_UNINTERRUPTIBLE);
 922
 923                 /*
 924                  * amdgpu_test_signaled_any must be called after
 925                  * set_current_state to prevent a race with wake_up_process
 926                  */
 927                 if (amdgpu_test_signaled_any(array, count))
 928                         break;
 929
 930                 if (adev->needs_reset) {
 931                         t = -EDEADLK;
 932                         break;
 933                 }
 934
 935                 t = schedule_timeout(t);
 936
 937                 if (t > 0 && intr && signal_pending(current))
 938                         t = -ERESTARTSYS;
 939         }
 940
 941         __set_current_state(TASK_RUNNING);
 942
 943 fence_rm_cb:
 944         for (idx = 0; idx < count; ++idx) {
 945                 fence = array[idx];
 946                 if (fence && cb[idx].base.func)
 947                         fence_remove_callback(fence, &cb[idx].base);
 948         }
 949
 950 err_free_cb:
 951         kfree(cb);
 952
 953         return t;
 954 }
 955
 956 const struct fence_ops amdgpu_fence_ops = {
 957         .get_driver_name = amdgpu_fence_get_driver_name,
 958         .get_timeline_name = amdgpu_fence_get_timeline_name,
 959         .enable_signaling = amdgpu_fence_enable_signaling,
 960         .signaled = amdgpu_fence_is_signaled,
 961         .wait = amdgpu_fence_default_wait,
 962         .release = NULL,
 963 };