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                 &adev->fence_queue.lock, adev->fence_context + ring->idx,
 130                 (*fence)->seq);
 131         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 132                                (*fence)->seq,
 133                                AMDGPU_FENCE_FLAG_INT);
 134         trace_amdgpu_fence_emit(ring->adev->ddev, ring->idx, (*fence)->seq);
 135         return 0;
 136 }
 137
 138 /**
 139  * amdgpu_fence_check_signaled - callback from fence_queue
 140  *
 141  * this function is called with fence_queue lock held, which is also used
 142  * for the fence locking itself, so unlocked variants are used for
 143  * fence_signal, and remove_wait_queue.
 144  */
 145 static int amdgpu_fence_check_signaled(wait_queue_t *wait, unsigned mode, int flags, void *key)
 146 {
 147         struct amdgpu_fence *fence;
 148         struct amdgpu_device *adev;
 149         u64 seq;
 150         int ret;
 151
 152         fence = container_of(wait, struct amdgpu_fence, fence_wake);
 153         adev = fence->ring->adev;
 154
 155         /*
 156          * We cannot use amdgpu_fence_process here because we're already
 157          * in the waitqueue, in a call from wake_up_all.
 158          */
 159         seq = atomic64_read(&fence->ring->fence_drv.last_seq);
 160         if (seq >= fence->seq) {
 161                 ret = fence_signal_locked(&fence->base);
 162                 if (!ret)
 163                         FENCE_TRACE(&fence->base, "signaled from irq context\n");
 164                 else
 165                         FENCE_TRACE(&fence->base, "was already signaled\n");
 166
 167                 amdgpu_irq_put(adev, fence->ring->fence_drv.irq_src,
 168                                 fence->ring->fence_drv.irq_type);
 169                 __remove_wait_queue(&adev->fence_queue, &fence->fence_wake);
 170                 fence_put(&fence->base);
 171         } else
 172                 FENCE_TRACE(&fence->base, "pending\n");
 173         return 0;
 174 }
 175
 176 /**
 177  * amdgpu_fence_activity - check for fence activity
 178  *
 179  * @ring: pointer to struct amdgpu_ring
 180  *
 181  * Checks the current fence value and calculates the last
 182  * signalled fence value. Returns true if activity occured
 183  * on the ring, and the fence_queue should be waken up.
 184  */
 185 static bool amdgpu_fence_activity(struct amdgpu_ring *ring)
 186 {
 187         uint64_t seq, last_seq, last_emitted;
 188         unsigned count_loop = 0;
 189         bool wake = false;
 190
 191         /* Note there is a scenario here for an infinite loop but it's
 192          * very unlikely to happen. For it to happen, the current polling
 193          * process need to be interrupted by another process and another
 194          * process needs to update the last_seq btw the atomic read and
 195          * xchg of the current process.
 196          *
 197          * More over for this to go in infinite loop there need to be
 198          * continuously new fence signaled ie amdgpu_fence_read needs
 199          * to return a different value each time for both the currently
 200          * polling process and the other process that xchg the last_seq
 201          * btw atomic read and xchg of the current process. And the
 202          * value the other process set as last seq must be higher than
 203          * the seq value we just read. Which means that current process
 204          * need to be interrupted after amdgpu_fence_read and before
 205          * atomic xchg.
 206          *
 207          * To be even more safe we count the number of time we loop and
 208          * we bail after 10 loop just accepting the fact that we might
 209          * have temporarly set the last_seq not to the true real last
 210          * seq but to an older one.
 211          */
 212         last_seq = atomic64_read(&ring->fence_drv.last_seq);
 213         do {
 214                 last_emitted = ring->fence_drv.sync_seq[ring->idx];
 215                 seq = amdgpu_fence_read(ring);
 216                 seq |= last_seq & 0xffffffff00000000LL;
 217                 if (seq < last_seq) {
 218                         seq &= 0xffffffff;
 219                         seq |= last_emitted & 0xffffffff00000000LL;
 220                 }
 221
 222                 if (seq <= last_seq || seq > last_emitted) {
 223                         break;
 224                 }
 225                 /* If we loop over we don't want to return without
 226                  * checking if a fence is signaled as it means that the
 227                  * seq we just read is different from the previous on.
 228                  */
 229                 wake = true;
 230                 last_seq = seq;
 231                 if ((count_loop++) > 10) {
 232                         /* We looped over too many time leave with the
 233                          * fact that we might have set an older fence
 234                          * seq then the current real last seq as signaled
 235                          * by the hw.
 236                          */
 237                         break;
 238                 }
 239         } while (atomic64_xchg(&ring->fence_drv.last_seq, seq) > seq);
 240
 241         if (seq < last_emitted)
 242                 amdgpu_fence_schedule_check(ring);
 243
 244         return wake;
 245 }
 246
 247 /**
 248  * amdgpu_fence_check_lockup - check for hardware lockup
 249  *
 250  * @work: delayed work item
 251  *
 252  * Checks for fence activity and if there is none probe
 253  * the hardware if a lockup occured.
 254  */
 255 static void amdgpu_fence_check_lockup(struct work_struct *work)
 256 {
 257         struct amdgpu_fence_driver *fence_drv;
 258         struct amdgpu_ring *ring;
 259
 260         fence_drv = container_of(work, struct amdgpu_fence_driver,
 261                                 lockup_work.work);
 262         ring = fence_drv->ring;
 263
 264         if (!down_read_trylock(&ring->adev->exclusive_lock)) {
 265                 /* just reschedule the check if a reset is going on */
 266                 amdgpu_fence_schedule_check(ring);
 267                 return;
 268         }
 269
 270         if (fence_drv->delayed_irq && ring->adev->ddev->irq_enabled) {
 271                 fence_drv->delayed_irq = false;
 272                 amdgpu_irq_update(ring->adev, fence_drv->irq_src,
 273                                 fence_drv->irq_type);
 274         }
 275
 276         if (amdgpu_fence_activity(ring))
 277                 wake_up_all(&ring->adev->fence_queue);
 278         else if (amdgpu_ring_is_lockup(ring)) {
 279                 /* good news we believe it's a lockup */
 280                 dev_warn(ring->adev->dev, "GPU lockup (current fence id "
 281                         "0x%016llx last fence id 0x%016llx on ring %d)\n",
 282                         (uint64_t)atomic64_read(&fence_drv->last_seq),
 283                         fence_drv->sync_seq[ring->idx], ring->idx);
 284
 285                 /* remember that we need an reset */
 286                 ring->adev->needs_reset = true;
 287                 wake_up_all(&ring->adev->fence_queue);
 288         }
 289         up_read(&ring->adev->exclusive_lock);
 290 }
 291
 292 /**
 293  * amdgpu_fence_process - process a fence
 294  *
 295  * @adev: amdgpu_device pointer
 296  * @ring: ring index the fence is associated with
 297  *
 298  * Checks the current fence value and wakes the fence queue
 299  * if the sequence number has increased (all asics).
 300  */
 301 void amdgpu_fence_process(struct amdgpu_ring *ring)
 302 {
 303         uint64_t seq, last_seq, last_emitted;
 304         unsigned count_loop = 0;
 305         bool wake = false;
 306
 307         /* Note there is a scenario here for an infinite loop but it's
 308          * very unlikely to happen. For it to happen, the current polling
 309          * process need to be interrupted by another process and another
 310          * process needs to update the last_seq btw the atomic read and
 311          * xchg of the current process.
 312          *
 313          * More over for this to go in infinite loop there need to be
 314          * continuously new fence signaled ie amdgpu_fence_read needs
 315          * to return a different value each time for both the currently
 316          * polling process and the other process that xchg the last_seq
 317          * btw atomic read and xchg of the current process. And the
 318          * value the other process set as last seq must be higher than
 319          * the seq value we just read. Which means that current process
 320          * need to be interrupted after amdgpu_fence_read and before
 321          * atomic xchg.
 322          *
 323          * To be even more safe we count the number of time we loop and
 324          * we bail after 10 loop just accepting the fact that we might
 325          * have temporarly set the last_seq not to the true real last
 326          * seq but to an older one.
 327          */
 328         last_seq = atomic64_read(&ring->fence_drv.last_seq);
 329         do {
 330                 last_emitted = ring->fence_drv.sync_seq[ring->idx];
 331                 seq = amdgpu_fence_read(ring);
 332                 seq |= last_seq & 0xffffffff00000000LL;
 333                 if (seq < last_seq) {
 334                         seq &= 0xffffffff;
 335                         seq |= last_emitted & 0xffffffff00000000LL;
 336                 }
 337
 338                 if (seq <= last_seq || seq > last_emitted) {
 339                         break;
 340                 }
 341                 /* If we loop over we don't want to return without
 342                  * checking if a fence is signaled as it means that the
 343                  * seq we just read is different from the previous on.
 344                  */
 345                 wake = true;
 346                 last_seq = seq;
 347                 if ((count_loop++) > 10) {
 348                         /* We looped over too many time leave with the
 349                          * fact that we might have set an older fence
 350                          * seq then the current real last seq as signaled
 351                          * by the hw.
 352                          */
 353                         break;
 354                 }
 355         } while (atomic64_xchg(&ring->fence_drv.last_seq, seq) > seq);
 356
 357         if (wake)
 358                 wake_up_all(&ring->adev->fence_queue);
 359 }
 360
 361 /**
 362  * amdgpu_fence_seq_signaled - check if a fence sequence number has signaled
 363  *
 364  * @ring: ring the fence is associated with
 365  * @seq: sequence number
 366  *
 367  * Check if the last signaled fence sequnce number is >= the requested
 368  * sequence number (all asics).
 369  * Returns true if the fence has signaled (current fence value
 370  * is >= requested value) or false if it has not (current fence
 371  * value is < the requested value.  Helper function for
 372  * amdgpu_fence_signaled().
 373  */
 374 static bool amdgpu_fence_seq_signaled(struct amdgpu_ring *ring, u64 seq)
 375 {
 376         if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
 377                 return true;
 378
 379         /* poll new last sequence at least once */
 380         amdgpu_fence_process(ring);
 381         if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
 382                 return true;
 383
 384         return false;
 385 }
 386
 387 static bool amdgpu_fence_is_signaled(struct fence *f)
 388 {
 389         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 390         struct amdgpu_ring *ring = fence->ring;
 391         struct amdgpu_device *adev = ring->adev;
 392
 393         if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
 394                 return true;
 395
 396         if (down_read_trylock(&adev->exclusive_lock)) {
 397                 amdgpu_fence_process(ring);
 398                 up_read(&adev->exclusive_lock);
 399
 400                 if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
 401                         return true;
 402         }
 403         return false;
 404 }
 405
 406 /**
 407  * amdgpu_fence_enable_signaling - enable signalling on fence
 408  * @fence: fence
 409  *
 410  * This function is called with fence_queue lock held, and adds a callback
 411  * to fence_queue that checks if this fence is signaled, and if so it
 412  * signals the fence and removes itself.
 413  */
 414 static bool amdgpu_fence_enable_signaling(struct fence *f)
 415 {
 416         struct amdgpu_fence *fence = to_amdgpu_fence(f);
 417         struct amdgpu_ring *ring = fence->ring;
 418         struct amdgpu_device *adev = ring->adev;
 419
 420         if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
 421                 return false;
 422
 423         if (down_read_trylock(&adev->exclusive_lock)) {
 424                 amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 425                         ring->fence_drv.irq_type);
 426                 if (amdgpu_fence_activity(ring))
 427                         wake_up_all_locked(&adev->fence_queue);
 428
 429                 /* did fence get signaled after we enabled the sw irq? */
 430                 if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq) {
 431                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 432                                 ring->fence_drv.irq_type);
 433                         up_read(&adev->exclusive_lock);
 434                         return false;
 435                 }
 436
 437                 up_read(&adev->exclusive_lock);
 438         } else {
 439                 /* we're probably in a lockup, lets not fiddle too much */
 440                 if (amdgpu_irq_get_delayed(adev, ring->fence_drv.irq_src,
 441                         ring->fence_drv.irq_type))
 442                         ring->fence_drv.delayed_irq = true;
 443                 amdgpu_fence_schedule_check(ring);
 444         }
 445
 446         fence->fence_wake.flags = 0;
 447         fence->fence_wake.private = NULL;
 448         fence->fence_wake.func = amdgpu_fence_check_signaled;
 449         __add_wait_queue(&adev->fence_queue, &fence->fence_wake);
 450         fence_get(f);
 451         FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
 452         return true;
 453 }
 454
 455 /**
 456  * amdgpu_fence_signaled - check if a fence has signaled
 457  *
 458  * @fence: amdgpu fence object
 459  *
 460  * Check if the requested fence has signaled (all asics).
 461  * Returns true if the fence has signaled or false if it has not.
 462  */
 463 bool amdgpu_fence_signaled(struct amdgpu_fence *fence)
 464 {
 465         if (!fence)
 466                 return true;
 467
 468         if (amdgpu_fence_seq_signaled(fence->ring, fence->seq)) {
 469                 if (!fence_signal(&fence->base))
 470                         FENCE_TRACE(&fence->base, "signaled from amdgpu_fence_signaled\n");
 471                 return true;
 472         }
 473
 474         return false;
 475 }
 476
 477 /**
 478  * amdgpu_fence_any_seq_signaled - check if any sequence number is signaled
 479  *
 480  * @adev: amdgpu device pointer
 481  * @seq: sequence numbers
 482  *
 483  * Check if the last signaled fence sequnce number is >= the requested
 484  * sequence number (all asics).
 485  * Returns true if any has signaled (current value is >= requested value)
 486  * or false if it has not. Helper function for amdgpu_fence_wait_seq.
 487  */
 488 static bool amdgpu_fence_any_seq_signaled(struct amdgpu_device *adev, u64 *seq)
 489 {
 490         unsigned i;
 491
 492         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 493                 if (!adev->rings[i] || !seq[i])
 494                         continue;
 495
 496                 if (amdgpu_fence_seq_signaled(adev->rings[i], seq[i]))
 497                         return true;
 498         }
 499
 500         return false;
 501 }
 502
 503 /**
 504  * amdgpu_fence_wait_seq_timeout - wait for a specific sequence numbers
 505  *
 506  * @adev: amdgpu device pointer
 507  * @target_seq: sequence number(s) we want to wait for
 508  * @intr: use interruptable sleep
 509  * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
 510  *
 511  * Wait for the requested sequence number(s) to be written by any ring
 512  * (all asics).  Sequnce number array is indexed by ring id.
 513  * @intr selects whether to use interruptable (true) or non-interruptable
 514  * (false) sleep when waiting for the sequence number.  Helper function
 515  * for amdgpu_fence_wait_*().
 516  * Returns remaining time if the sequence number has passed, 0 when
 517  * the wait timeout, or an error for all other cases.
 518  * -EDEADLK is returned when a GPU lockup has been detected.
 519  */
 520 long amdgpu_fence_wait_seq_timeout(struct amdgpu_device *adev, u64 *target_seq,
 521                                    bool intr, long timeout)
 522 {
 523         uint64_t last_seq[AMDGPU_MAX_RINGS];
 524         bool signaled;
 525         int i, r;
 526
 527         if (timeout == 0) {
 528                 return amdgpu_fence_any_seq_signaled(adev, target_seq);
 529         }
 530
 531         while (!amdgpu_fence_any_seq_signaled(adev, target_seq)) {
 532
 533                 /* Save current sequence values, used to check for GPU lockups */
 534                 for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 535                         struct amdgpu_ring *ring = adev->rings[i];
 536
 537                         if (!ring || !target_seq[i])
 538                                 continue;
 539
 540                         last_seq[i] = atomic64_read(&ring->fence_drv.last_seq);
 541                         trace_amdgpu_fence_wait_begin(adev->ddev, i, target_seq[i]);
 542                         amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 543                                        ring->fence_drv.irq_type);
 544                 }
 545
 546                 if (intr) {
 547                         r = wait_event_interruptible_timeout(adev->fence_queue, (
 548                                 (signaled = amdgpu_fence_any_seq_signaled(adev, target_seq))
 549                                  || adev->needs_reset), AMDGPU_FENCE_JIFFIES_TIMEOUT);
 550                 } else {
 551                         r = wait_event_timeout(adev->fence_queue, (
 552                                 (signaled = amdgpu_fence_any_seq_signaled(adev, target_seq))
 553                                  || adev->needs_reset), AMDGPU_FENCE_JIFFIES_TIMEOUT);
 554                 }
 555
 556                 for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 557                         struct amdgpu_ring *ring = adev->rings[i];
 558
 559                         if (!ring || !target_seq[i])
 560                                 continue;
 561
 562                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 563                                        ring->fence_drv.irq_type);
 564                         trace_amdgpu_fence_wait_end(adev->ddev, i, target_seq[i]);
 565                 }
 566
 567                 if (unlikely(r < 0))
 568                         return r;
 569
 570                 if (unlikely(!signaled)) {
 571
 572                         if (adev->needs_reset)
 573                                 return -EDEADLK;
 574
 575                         /* we were interrupted for some reason and fence
 576                          * isn't signaled yet, resume waiting */
 577                         if (r)
 578                                 continue;
 579
 580                         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 581                                 struct amdgpu_ring *ring = adev->rings[i];
 582
 583                                 if (!ring || !target_seq[i])
 584                                         continue;
 585
 586                                 if (last_seq[i] != atomic64_read(&ring->fence_drv.last_seq))
 587                                         break;
 588                         }
 589
 590                         if (i != AMDGPU_MAX_RINGS)
 591                                 continue;
 592
 593                         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 594                                 if (!adev->rings[i] || !target_seq[i])
 595                                         continue;
 596
 597                                 if (amdgpu_ring_is_lockup(adev->rings[i]))
 598                                         break;
 599                         }
 600
 601                         if (i < AMDGPU_MAX_RINGS) {
 602                                 /* good news we believe it's a lockup */
 603                                 dev_warn(adev->dev, "GPU lockup (waiting for "
 604                                          "0x%016llx last fence id 0x%016llx on"
 605                                          " ring %d)\n",
 606                                          target_seq[i], last_seq[i], i);
 607
 608                                 /* remember that we need an reset */
 609                                 adev->needs_reset = true;
 610                                 wake_up_all(&adev->fence_queue);
 611                                 return -EDEADLK;
 612                         }
 613
 614                         if (timeout < MAX_SCHEDULE_TIMEOUT) {
 615                                 timeout -= AMDGPU_FENCE_JIFFIES_TIMEOUT;
 616                                 if (timeout <= 0) {
 617                                         return 0;
 618                                 }
 619                         }
 620                 }
 621         }
 622         return timeout;
 623 }
 624
 625 /**
 626  * amdgpu_fence_wait - wait for a fence to signal
 627  *
 628  * @fence: amdgpu fence object
 629  * @intr: use interruptable sleep
 630  *
 631  * Wait for the requested fence to signal (all asics).
 632  * @intr selects whether to use interruptable (true) or non-interruptable
 633  * (false) sleep when waiting for the fence.
 634  * Returns 0 if the fence has passed, error for all other cases.
 635  */
 636 int amdgpu_fence_wait(struct amdgpu_fence *fence, bool intr)
 637 {
 638         uint64_t seq[AMDGPU_MAX_RINGS] = {};
 639         long r;
 640
 641         seq[fence->ring->idx] = fence->seq;
 642         r = amdgpu_fence_wait_seq_timeout(fence->ring->adev, seq, intr, MAX_SCHEDULE_TIMEOUT);
 643         if (r < 0) {
 644                 return r;
 645         }
 646
 647         r = fence_signal(&fence->base);
 648         if (!r)
 649                 FENCE_TRACE(&fence->base, "signaled from fence_wait\n");
 650         return 0;
 651 }
 652
 653 /**
 654  * amdgpu_fence_wait_any - wait for a fence to signal on any ring
 655  *
 656  * @adev: amdgpu device pointer
 657  * @fences: amdgpu fence object(s)
 658  * @intr: use interruptable sleep
 659  *
 660  * Wait for any requested fence to signal (all asics).  Fence
 661  * array is indexed by ring id.  @intr selects whether to use
 662  * interruptable (true) or non-interruptable (false) sleep when
 663  * waiting for the fences. Used by the suballocator.
 664  * Returns 0 if any fence has passed, error for all other cases.
 665  */
 666 int amdgpu_fence_wait_any(struct amdgpu_device *adev,
 667                           struct amdgpu_fence **fences,
 668                           bool intr)
 669 {
 670         uint64_t seq[AMDGPU_MAX_RINGS];
 671         unsigned i, num_rings = 0;
 672         long r;
 673
 674         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 675                 seq[i] = 0;
 676
 677                 if (!fences[i]) {
 678                         continue;
 679                 }
 680
 681                 seq[i] = fences[i]->seq;
 682                 ++num_rings;
 683         }
 684
 685         /* nothing to wait for ? */
 686         if (num_rings == 0)
 687                 return -ENOENT;
 688
 689         r = amdgpu_fence_wait_seq_timeout(adev, seq, intr, MAX_SCHEDULE_TIMEOUT);
 690         if (r < 0) {
 691                 return r;
 692         }
 693         return 0;
 694 }
 695
 696 /**
 697  * amdgpu_fence_wait_next - wait for the next fence to signal
 698  *
 699  * @adev: amdgpu device pointer
 700  * @ring: ring index the fence is associated with
 701  *
 702  * Wait for the next fence on the requested ring to signal (all asics).
 703  * Returns 0 if the next fence has passed, error for all other cases.
 704  * Caller must hold ring lock.
 705  */
 706 int amdgpu_fence_wait_next(struct amdgpu_ring *ring)
 707 {
 708         uint64_t seq[AMDGPU_MAX_RINGS] = {};
 709         long r;
 710
 711         seq[ring->idx] = atomic64_read(&ring->fence_drv.last_seq) + 1ULL;
 712         if (seq[ring->idx] >= ring->fence_drv.sync_seq[ring->idx]) {
 713                 /* nothing to wait for, last_seq is
 714                    already the last emited fence */
 715                 return -ENOENT;
 716         }
 717         r = amdgpu_fence_wait_seq_timeout(ring->adev, seq, false, MAX_SCHEDULE_TIMEOUT);
 718         if (r < 0)
 719                 return r;
 720         return 0;
 721 }
 722
 723 /**
 724  * amdgpu_fence_wait_empty - wait for all fences to signal
 725  *
 726  * @adev: amdgpu device pointer
 727  * @ring: ring index the fence is associated with
 728  *
 729  * Wait for all fences on the requested ring to signal (all asics).
 730  * Returns 0 if the fences have passed, error for all other cases.
 731  * Caller must hold ring lock.
 732  */
 733 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 734 {
 735         struct amdgpu_device *adev = ring->adev;
 736         uint64_t seq[AMDGPU_MAX_RINGS] = {};
 737         long r;
 738
 739         seq[ring->idx] = ring->fence_drv.sync_seq[ring->idx];
 740         if (!seq[ring->idx])
 741                 return 0;
 742
 743         r = amdgpu_fence_wait_seq_timeout(adev, seq, false, MAX_SCHEDULE_TIMEOUT);
 744         if (r < 0) {
 745                 if (r == -EDEADLK)
 746                         return -EDEADLK;
 747
 748                 dev_err(adev->dev, "error waiting for ring[%d] to become idle (%ld)\n",
 749                         ring->idx, r);
 750         }
 751         return 0;
 752 }
 753
 754 /**
 755  * amdgpu_fence_ref - take a ref on a fence
 756  *
 757  * @fence: amdgpu fence object
 758  *
 759  * Take a reference on a fence (all asics).
 760  * Returns the fence.
 761  */
 762 struct amdgpu_fence *amdgpu_fence_ref(struct amdgpu_fence *fence)
 763 {
 764         fence_get(&fence->base);
 765         return fence;
 766 }
 767
 768 /**
 769  * amdgpu_fence_unref - remove a ref on a fence
 770  *
 771  * @fence: amdgpu fence object
 772  *
 773  * Remove a reference on a fence (all asics).
 774  */
 775 void amdgpu_fence_unref(struct amdgpu_fence **fence)
 776 {
 777         struct amdgpu_fence *tmp = *fence;
 778
 779         *fence = NULL;
 780         if (tmp)
 781                 fence_put(&tmp->base);
 782 }
 783
 784 /**
 785  * amdgpu_fence_count_emitted - get the count of emitted fences
 786  *
 787  * @ring: ring the fence is associated with
 788  *
 789  * Get the number of fences emitted on the requested ring (all asics).
 790  * Returns the number of emitted fences on the ring.  Used by the
 791  * dynpm code to ring track activity.
 792  */
 793 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 794 {
 795         uint64_t emitted;
 796
 797         /* We are not protected by ring lock when reading the last sequence
 798          * but it's ok to report slightly wrong fence count here.
 799          */
 800         amdgpu_fence_process(ring);
 801         emitted = ring->fence_drv.sync_seq[ring->idx]
 802                 - atomic64_read(&ring->fence_drv.last_seq);
 803         /* to avoid 32bits warp around */
 804         if (emitted > 0x10000000)
 805                 emitted = 0x10000000;
 806
 807         return (unsigned)emitted;
 808 }
 809
 810 /**
 811  * amdgpu_fence_need_sync - do we need a semaphore
 812  *
 813  * @fence: amdgpu fence object
 814  * @dst_ring: which ring to check against
 815  *
 816  * Check if the fence needs to be synced against another ring
 817  * (all asics).  If so, we need to emit a semaphore.
 818  * Returns true if we need to sync with another ring, false if
 819  * not.
 820  */
 821 bool amdgpu_fence_need_sync(struct amdgpu_fence *fence,
 822                             struct amdgpu_ring *dst_ring)
 823 {
 824         struct amdgpu_fence_driver *fdrv;
 825
 826         if (!fence)
 827                 return false;
 828
 829         if (fence->ring == dst_ring)
 830                 return false;
 831
 832         /* we are protected by the ring mutex */
 833         fdrv = &dst_ring->fence_drv;
 834         if (fence->seq <= fdrv->sync_seq[fence->ring->idx])
 835                 return false;
 836
 837         return true;
 838 }
 839
 840 /**
 841  * amdgpu_fence_note_sync - record the sync point
 842  *
 843  * @fence: amdgpu fence object
 844  * @dst_ring: which ring to check against
 845  *
 846  * Note the sequence number at which point the fence will
 847  * be synced with the requested ring (all asics).
 848  */
 849 void amdgpu_fence_note_sync(struct amdgpu_fence *fence,
 850                             struct amdgpu_ring *dst_ring)
 851 {
 852         struct amdgpu_fence_driver *dst, *src;
 853         unsigned i;
 854
 855         if (!fence)
 856                 return;
 857
 858         if (fence->ring == dst_ring)
 859                 return;
 860
 861         /* we are protected by the ring mutex */
 862         src = &fence->ring->fence_drv;
 863         dst = &dst_ring->fence_drv;
 864         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 865                 if (i == dst_ring->idx)
 866                         continue;
 867
 868                 dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);
 869         }
 870 }
 871
 872 /**
 873  * amdgpu_fence_driver_start_ring - make the fence driver
 874  * ready for use on the requested ring.
 875  *
 876  * @ring: ring to start the fence driver on
 877  * @irq_src: interrupt source to use for this ring
 878  * @irq_type: interrupt type to use for this ring
 879  *
 880  * Make the fence driver ready for processing (all asics).
 881  * Not all asics have all rings, so each asic will only
 882  * start the fence driver on the rings it has.
 883  * Returns 0 for success, errors for failure.
 884  */
 885 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 886                                    struct amdgpu_irq_src *irq_src,
 887                                    unsigned irq_type)
 888 {
 889         struct amdgpu_device *adev = ring->adev;
 890         uint64_t index;
 891
 892         if (ring != &adev->uvd.ring) {
 893                 ring->fence_drv.cpu_addr = &adev->wb.wb[ring->fence_offs];
 894                 ring->fence_drv.gpu_addr = adev->wb.gpu_addr + (ring->fence_offs * 4);
 895         } else {
 896                 /* put fence directly behind firmware */
 897                 index = ALIGN(adev->uvd.fw->size, 8);
 898                 ring->fence_drv.cpu_addr = adev->uvd.cpu_addr + index;
 899                 ring->fence_drv.gpu_addr = adev->uvd.gpu_addr + index;
 900         }
 901         amdgpu_fence_write(ring, atomic64_read(&ring->fence_drv.last_seq));
 902         ring->fence_drv.initialized = true;
 903         ring->fence_drv.irq_src = irq_src;
 904         ring->fence_drv.irq_type = irq_type;
 905         dev_info(adev->dev, "fence driver on ring %d use gpu addr 0x%016llx, "
 906                  "cpu addr 0x%p\n", ring->idx,
 907                  ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr);
 908         return 0;
 909 }
 910
 911 /**
 912  * amdgpu_fence_driver_init_ring - init the fence driver
 913  * for the requested ring.
 914  *
 915  * @ring: ring to init the fence driver on
 916  *
 917  * Init the fence driver for the requested ring (all asics).
 918  * Helper function for amdgpu_fence_driver_init().
 919  */
 920 void amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 921 {
 922         int i;
 923
 924         ring->fence_drv.cpu_addr = NULL;
 925         ring->fence_drv.gpu_addr = 0;
 926         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 927                 ring->fence_drv.sync_seq[i] = 0;
 928
 929         atomic64_set(&ring->fence_drv.last_seq, 0);
 930         ring->fence_drv.initialized = false;
 931
 932         INIT_DELAYED_WORK(&ring->fence_drv.lockup_work,
 933                         amdgpu_fence_check_lockup);
 934         ring->fence_drv.ring = ring;
 935 }
 936
 937 /**
 938  * amdgpu_fence_driver_init - init the fence driver
 939  * for all possible rings.
 940  *
 941  * @adev: amdgpu device pointer
 942  *
 943  * Init the fence driver for all possible rings (all asics).
 944  * Not all asics have all rings, so each asic will only
 945  * start the fence driver on the rings it has using
 946  * amdgpu_fence_driver_start_ring().
 947  * Returns 0 for success.
 948  */
 949 int amdgpu_fence_driver_init(struct amdgpu_device *adev)
 950 {
 951         init_waitqueue_head(&adev->fence_queue);
 952         if (amdgpu_debugfs_fence_init(adev))
 953                 dev_err(adev->dev, "fence debugfs file creation failed\n");
 954
 955         return 0;
 956 }
 957
 958 /**
 959  * amdgpu_fence_driver_fini - tear down the fence driver
 960  * for all possible rings.
 961  *
 962  * @adev: amdgpu device pointer
 963  *
 964  * Tear down the fence driver for all possible rings (all asics).
 965  */
 966 void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
 967 {
 968         int i, r;
 969
 970         mutex_lock(&adev->ring_lock);
 971         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 972                 struct amdgpu_ring *ring = adev->rings[i];
 973                 if (!ring || !ring->fence_drv.initialized)
 974                         continue;
 975                 r = amdgpu_fence_wait_empty(ring);
 976                 if (r) {
 977                         /* no need to trigger GPU reset as we are unloading */
 978                         amdgpu_fence_driver_force_completion(adev);
 979                 }
 980                 wake_up_all(&adev->fence_queue);
 981                 ring->fence_drv.initialized = false;
 982         }
 983         mutex_unlock(&adev->ring_lock);
 984 }
 985
 986 /**
 987  * amdgpu_fence_driver_force_completion - force all fence waiter to complete
 988  *
 989  * @adev: amdgpu device pointer
 990  *
 991  * In case of GPU reset failure make sure no process keep waiting on fence
 992  * that will never complete.
 993  */
 994 void amdgpu_fence_driver_force_completion(struct amdgpu_device *adev)
 995 {
 996         int i;
 997
 998         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 999                 struct amdgpu_ring *ring = adev->rings[i];
1000                 if (!ring || !ring->fence_drv.initialized)
1001                         continue;
1002
1003                 amdgpu_fence_write(ring, ring->fence_drv.sync_seq[i]);
1004         }
1005 }
1006
1007
1008 /*
1009  * Fence debugfs
1010  */
1011 #if defined(CONFIG_DEBUG_FS)
1012 static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data)
1013 {
1014         struct drm_info_node *node = (struct drm_info_node *)m->private;
1015         struct drm_device *dev = node->minor->dev;
1016         struct amdgpu_device *adev = dev->dev_private;
1017         int i, j;
1018
1019         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
1020                 struct amdgpu_ring *ring = adev->rings[i];
1021                 if (!ring || !ring->fence_drv.initialized)
1022                         continue;
1023
1024                 amdgpu_fence_process(ring);
1025
1026                 seq_printf(m, "--- ring %d ---\n", i);
1027                 seq_printf(m, "Last signaled fence 0x%016llx\n",
1028                            (unsigned long long)atomic64_read(&ring->fence_drv.last_seq));
1029                 seq_printf(m, "Last emitted        0x%016llx\n",
1030                            ring->fence_drv.sync_seq[i]);
1031
1032                 for (j = 0; j < AMDGPU_MAX_RINGS; ++j) {
1033                         struct amdgpu_ring *other = adev->rings[j];
1034                         if (i != j && other && other->fence_drv.initialized)
1035                                 seq_printf(m, "Last sync to ring %d 0x%016llx\n",
1036                                            j, ring->fence_drv.sync_seq[j]);
1037                 }
1038         }
1039         return 0;
1040 }
1041
1042 static struct drm_info_list amdgpu_debugfs_fence_list[] = {
1043         {"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL},
1044 };
1045 #endif
1046
1047 int amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
1048 {
1049 #if defined(CONFIG_DEBUG_FS)
1050         return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list, 1);
1051 #else
1052         return 0;
1053 #endif
1054 }
1055
1056 static const char *amdgpu_fence_get_driver_name(struct fence *fence)
1057 {
1058         return "amdgpu";
1059 }
1060
1061 static const char *amdgpu_fence_get_timeline_name(struct fence *f)
1062 {
1063         struct amdgpu_fence *fence = to_amdgpu_fence(f);
1064         return (const char *)fence->ring->name;
1065 }
1066
1067 static inline bool amdgpu_test_signaled(struct amdgpu_fence *fence)
1068 {
1069         return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
1070 }
1071
1072 struct amdgpu_wait_cb {
1073         struct fence_cb base;
1074         struct task_struct *task;
1075 };
1076
1077 static void amdgpu_fence_wait_cb(struct fence *fence, struct fence_cb *cb)
1078 {
1079         struct amdgpu_wait_cb *wait =
1080                 container_of(cb, struct amdgpu_wait_cb, base);
1081         wake_up_process(wait->task);
1082 }
1083
1084 static signed long amdgpu_fence_default_wait(struct fence *f, bool intr,
1085                                              signed long t)
1086 {
1087         struct amdgpu_fence *fence = to_amdgpu_fence(f);
1088         struct amdgpu_device *adev = fence->ring->adev;
1089         struct amdgpu_wait_cb cb;
1090
1091         cb.task = current;
1092
1093         if (fence_add_callback(f, &cb.base, amdgpu_fence_wait_cb))
1094                 return t;
1095
1096         while (t > 0) {
1097                 if (intr)
1098                         set_current_state(TASK_INTERRUPTIBLE);
1099                 else
1100                         set_current_state(TASK_UNINTERRUPTIBLE);
1101
1102                 /*
1103                  * amdgpu_test_signaled must be called after
1104                  * set_current_state to prevent a race with wake_up_process
1105                  */
1106                 if (amdgpu_test_signaled(fence))
1107                         break;
1108
1109                 if (adev->needs_reset) {
1110                         t = -EDEADLK;
1111                         break;
1112                 }
1113
1114                 t = schedule_timeout(t);
1115
1116                 if (t > 0 && intr && signal_pending(current))
1117                         t = -ERESTARTSYS;
1118         }
1119
1120         __set_current_state(TASK_RUNNING);
1121         fence_remove_callback(f, &cb.base);
1122
1123         return t;
1124 }
1125
1126 const struct fence_ops amdgpu_fence_ops = {
1127         .get_driver_name = amdgpu_fence_get_driver_name,
1128         .get_timeline_name = amdgpu_fence_get_timeline_name,
1129         .enable_signaling = amdgpu_fence_enable_signaling,
1130         .signaled = amdgpu_fence_is_signaled,
1131         .wait = amdgpu_fence_default_wait,
1132         .release = NULL,
1133 };