drivers/gpu/drm/radeon/radeon_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 <drm/drmP.h>
  38 #include "radeon_reg.h"
  39 #include "radeon.h"
  40 #include "radeon_trace.h"
  41
  42 /*
  43  * Fences
  44  * Fences mark an event in the GPUs pipeline and are used
  45  * for GPU/CPU synchronization.  When the fence is written,
  46  * it is expected that all buffers associated with that fence
  47  * are no longer in use by the associated ring on the GPU and
  48  * that the the relevant GPU caches have been flushed.  Whether
  49  * we use a scratch register or memory location depends on the asic
  50  * and whether writeback is enabled.
  51  */
  52
  53 /**
  54  * radeon_fence_write - write a fence value
  55  *
  56  * @rdev: radeon_device pointer
  57  * @seq: sequence number to write
  58  * @ring: ring index the fence is associated with
  59  *
  60  * Writes a fence value to memory or a scratch register (all asics).
  61  */
  62 static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring)
  63 {
  64         struct radeon_fence_driver *drv = &rdev->fence_drv[ring];
  65         if (likely(rdev->wb.enabled || !drv->scratch_reg)) {
  66                 if (drv->cpu_addr) {
  67                         *drv->cpu_addr = cpu_to_le32(seq);
  68                 }
  69         } else {
  70                 WREG32(drv->scratch_reg, seq);
  71         }
  72 }
  73
  74 /**
  75  * radeon_fence_read - read a fence value
  76  *
  77  * @rdev: radeon_device pointer
  78  * @ring: ring index the fence is associated with
  79  *
  80  * Reads a fence value from memory or a scratch register (all asics).
  81  * Returns the value of the fence read from memory or register.
  82  */
  83 static u32 radeon_fence_read(struct radeon_device *rdev, int ring)
  84 {
  85         struct radeon_fence_driver *drv = &rdev->fence_drv[ring];
  86         u32 seq = 0;
  87
  88         if (likely(rdev->wb.enabled || !drv->scratch_reg)) {
  89                 if (drv->cpu_addr) {
  90                         seq = le32_to_cpu(*drv->cpu_addr);
  91                 } else {
  92                         seq = lower_32_bits(atomic64_read(&drv->last_seq));
  93                 }
  94         } else {
  95                 seq = RREG32(drv->scratch_reg);
  96         }
  97         return seq;
  98 }
  99
 100 /**
 101  * radeon_fence_schedule_check - schedule lockup check
 102  *
 103  * @rdev: radeon_device pointer
 104  * @ring: ring index we should work with
 105  *
 106  * Queues a delayed work item to check for lockups.
 107  */
 108 static void radeon_fence_schedule_check(struct radeon_device *rdev, int ring)
 109 {
 110         /*
 111          * Do not reset the timer here with mod_delayed_work,
 112          * this can livelock in an interaction with TTM delayed destroy.
 113          */
 114         queue_delayed_work(system_power_efficient_wq,
 115                            &rdev->fence_drv[ring].lockup_work,
 116                            RADEON_FENCE_JIFFIES_TIMEOUT);
 117 }
 118
 119 /**
 120  * radeon_fence_emit - emit a fence on the requested ring
 121  *
 122  * @rdev: radeon_device pointer
 123  * @fence: radeon fence object
 124  * @ring: ring index the fence is associated with
 125  *
 126  * Emits a fence command on the requested ring (all asics).
 127  * Returns 0 on success, -ENOMEM on failure.
 128  */
 129 int radeon_fence_emit(struct radeon_device *rdev,
 130                       struct radeon_fence **fence,
 131                       int ring)
 132 {
 133         u64 seq;
 134
 135         /* we are protected by the ring emission mutex */
 136         *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL);
 137         if ((*fence) == NULL) {
 138                 return -ENOMEM;
 139         }
 140         (*fence)->rdev = rdev;
 141         (*fence)->seq = seq = ++rdev->fence_drv[ring].sync_seq[ring];
 142         (*fence)->ring = ring;
 143         (*fence)->is_vm_update = false;
 144         fence_init(&(*fence)->base, &radeon_fence_ops,
 145                    &rdev->fence_queue.lock, rdev->fence_context + ring, seq);
 146         radeon_fence_ring_emit(rdev, ring, *fence);
 147         trace_radeon_fence_emit(rdev->ddev, ring, (*fence)->seq);
 148         radeon_fence_schedule_check(rdev, ring);
 149         return 0;
 150 }
 151
 152 /**
 153  * radeon_fence_check_signaled - callback from fence_queue
 154  *
 155  * this function is called with fence_queue lock held, which is also used
 156  * for the fence locking itself, so unlocked variants are used for
 157  * fence_signal, and remove_wait_queue.
 158  */
 159 static int radeon_fence_check_signaled(wait_queue_t *wait, unsigned mode, int flags, void *key)
 160 {
 161         struct radeon_fence *fence;
 162         u64 seq;
 163
 164         fence = container_of(wait, struct radeon_fence, fence_wake);
 165
 166         /*
 167          * We cannot use radeon_fence_process here because we're already
 168          * in the waitqueue, in a call from wake_up_all.
 169          */
 170         seq = atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq);
 171         if (seq >= fence->seq) {
 172                 int ret = fence_signal_locked(&fence->base);
 173
 174                 if (!ret)
 175                         FENCE_TRACE(&fence->base, "signaled from irq context\n");
 176                 else
 177                         FENCE_TRACE(&fence->base, "was already signaled\n");
 178
 179                 radeon_irq_kms_sw_irq_put(fence->rdev, fence->ring);
 180                 __remove_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake);
 181                 fence_put(&fence->base);
 182         } else
 183                 FENCE_TRACE(&fence->base, "pending\n");
 184         return 0;
 185 }
 186
 187 /**
 188  * radeon_fence_activity - check for fence activity
 189  *
 190  * @rdev: radeon_device pointer
 191  * @ring: ring index the fence is associated with
 192  *
 193  * Checks the current fence value and calculates the last
 194  * signalled fence value. Returns true if activity occured
 195  * on the ring, and the fence_queue should be waken up.
 196  */
 197 static bool radeon_fence_activity(struct radeon_device *rdev, int ring)
 198 {
 199         uint64_t seq, last_seq, last_emitted;
 200         unsigned count_loop = 0;
 201         bool wake = false;
 202
 203         /* Note there is a scenario here for an infinite loop but it's
 204          * very unlikely to happen. For it to happen, the current polling
 205          * process need to be interrupted by another process and another
 206          * process needs to update the last_seq btw the atomic read and
 207          * xchg of the current process.
 208          *
 209          * More over for this to go in infinite loop there need to be
 210          * continuously new fence signaled ie radeon_fence_read needs
 211          * to return a different value each time for both the currently
 212          * polling process and the other process that xchg the last_seq
 213          * btw atomic read and xchg of the current process. And the
 214          * value the other process set as last seq must be higher than
 215          * the seq value we just read. Which means that current process
 216          * need to be interrupted after radeon_fence_read and before
 217          * atomic xchg.
 218          *
 219          * To be even more safe we count the number of time we loop and
 220          * we bail after 10 loop just accepting the fact that we might
 221          * have temporarly set the last_seq not to the true real last
 222          * seq but to an older one.
 223          */
 224         last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq);
 225         do {
 226                 last_emitted = rdev->fence_drv[ring].sync_seq[ring];
 227                 seq = radeon_fence_read(rdev, ring);
 228                 seq |= last_seq & 0xffffffff00000000LL;
 229                 if (seq < last_seq) {
 230                         seq &= 0xffffffff;
 231                         seq |= last_emitted & 0xffffffff00000000LL;
 232                 }
 233
 234                 if (seq <= last_seq || seq > last_emitted) {
 235                         break;
 236                 }
 237                 /* If we loop over we don't want to return without
 238                  * checking if a fence is signaled as it means that the
 239                  * seq we just read is different from the previous on.
 240                  */
 241                 wake = true;
 242                 last_seq = seq;
 243                 if ((count_loop++) > 10) {
 244                         /* We looped over too many time leave with the
 245                          * fact that we might have set an older fence
 246                          * seq then the current real last seq as signaled
 247                          * by the hw.
 248                          */
 249                         break;
 250                 }
 251         } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);
 252
 253         if (seq < last_emitted)
 254                 radeon_fence_schedule_check(rdev, ring);
 255
 256         return wake;
 257 }
 258
 259 /**
 260  * radeon_fence_check_lockup - check for hardware lockup
 261  *
 262  * @work: delayed work item
 263  *
 264  * Checks for fence activity and if there is none probe
 265  * the hardware if a lockup occured.
 266  */
 267 static void radeon_fence_check_lockup(struct work_struct *work)
 268 {
 269         struct radeon_fence_driver *fence_drv;
 270         struct radeon_device *rdev;
 271         int ring;
 272
 273         fence_drv = container_of(work, struct radeon_fence_driver,
 274                                  lockup_work.work);
 275         rdev = fence_drv->rdev;
 276         ring = fence_drv - &rdev->fence_drv[0];
 277
 278         if (!down_read_trylock(&rdev->exclusive_lock)) {
 279                 /* just reschedule the check if a reset is going on */
 280                 radeon_fence_schedule_check(rdev, ring);
 281                 return;
 282         }
 283
 284         if (fence_drv->delayed_irq && rdev->ddev->irq_enabled) {
 285                 unsigned long irqflags;
 286
 287                 fence_drv->delayed_irq = false;
 288                 spin_lock_irqsave(&rdev->irq.lock, irqflags);
 289                 radeon_irq_set(rdev);
 290                 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 291         }
 292
 293         if (radeon_fence_activity(rdev, ring))
 294                 wake_up_all(&rdev->fence_queue);
 295
 296         else if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) {
 297
 298                 /* good news we believe it's a lockup */
 299                 dev_warn(rdev->dev, "GPU lockup (current fence id "
 300                          "0x%016llx last fence id 0x%016llx on ring %d)\n",
 301                          (uint64_t)atomic64_read(&fence_drv->last_seq),
 302                          fence_drv->sync_seq[ring], ring);
 303
 304                 /* remember that we need an reset */
 305                 rdev->needs_reset = true;
 306                 wake_up_all(&rdev->fence_queue);
 307         }
 308         up_read(&rdev->exclusive_lock);
 309 }
 310
 311 /**
 312  * radeon_fence_process - process a fence
 313  *
 314  * @rdev: radeon_device pointer
 315  * @ring: ring index the fence is associated with
 316  *
 317  * Checks the current fence value and wakes the fence queue
 318  * if the sequence number has increased (all asics).
 319  */
 320 void radeon_fence_process(struct radeon_device *rdev, int ring)
 321 {
 322         if (radeon_fence_activity(rdev, ring))
 323                 wake_up_all(&rdev->fence_queue);
 324 }
 325
 326 /**
 327  * radeon_fence_seq_signaled - check if a fence sequence number has signaled
 328  *
 329  * @rdev: radeon device pointer
 330  * @seq: sequence number
 331  * @ring: ring index the fence is associated with
 332  *
 333  * Check if the last signaled fence sequnce number is >= the requested
 334  * sequence number (all asics).
 335  * Returns true if the fence has signaled (current fence value
 336  * is >= requested value) or false if it has not (current fence
 337  * value is < the requested value.  Helper function for
 338  * radeon_fence_signaled().
 339  */
 340 static bool radeon_fence_seq_signaled(struct radeon_device *rdev,
 341                                       u64 seq, unsigned ring)
 342 {
 343         if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
 344                 return true;
 345         }
 346         /* poll new last sequence at least once */
 347         radeon_fence_process(rdev, ring);
 348         if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
 349                 return true;
 350         }
 351         return false;
 352 }
 353
 354 static bool radeon_fence_is_signaled(struct fence *f)
 355 {
 356         struct radeon_fence *fence = to_radeon_fence(f);
 357         struct radeon_device *rdev = fence->rdev;
 358         unsigned ring = fence->ring;
 359         u64 seq = fence->seq;
 360
 361         if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
 362                 return true;
 363         }
 364
 365         if (down_read_trylock(&rdev->exclusive_lock)) {
 366                 radeon_fence_process(rdev, ring);
 367                 up_read(&rdev->exclusive_lock);
 368
 369                 if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
 370                         return true;
 371                 }
 372         }
 373         return false;
 374 }
 375
 376 /**
 377  * radeon_fence_enable_signaling - enable signalling on fence
 378  * @fence: fence
 379  *
 380  * This function is called with fence_queue lock held, and adds a callback
 381  * to fence_queue that checks if this fence is signaled, and if so it
 382  * signals the fence and removes itself.
 383  */
 384 static bool radeon_fence_enable_signaling(struct fence *f)
 385 {
 386         struct radeon_fence *fence = to_radeon_fence(f);
 387         struct radeon_device *rdev = fence->rdev;
 388
 389         if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq)
 390                 return false;
 391
 392         if (down_read_trylock(&rdev->exclusive_lock)) {
 393                 radeon_irq_kms_sw_irq_get(rdev, fence->ring);
 394
 395                 if (radeon_fence_activity(rdev, fence->ring))
 396                         wake_up_all_locked(&rdev->fence_queue);
 397
 398                 /* did fence get signaled after we enabled the sw irq? */
 399                 if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq) {
 400                         radeon_irq_kms_sw_irq_put(rdev, fence->ring);
 401                         up_read(&rdev->exclusive_lock);
 402                         return false;
 403                 }
 404
 405                 up_read(&rdev->exclusive_lock);
 406         } else {
 407                 /* we're probably in a lockup, lets not fiddle too much */
 408                 if (radeon_irq_kms_sw_irq_get_delayed(rdev, fence->ring))
 409                         rdev->fence_drv[fence->ring].delayed_irq = true;
 410                 radeon_fence_schedule_check(rdev, fence->ring);
 411         }
 412
 413         fence->fence_wake.flags = 0;
 414         fence->fence_wake.private = NULL;
 415         fence->fence_wake.func = radeon_fence_check_signaled;
 416         __add_wait_queue(&rdev->fence_queue, &fence->fence_wake);
 417         fence_get(f);
 418
 419         FENCE_TRACE(&fence->base, "armed on ring %i!\n", fence->ring);
 420         return true;
 421 }
 422
 423 /**
 424  * radeon_fence_signaled - check if a fence has signaled
 425  *
 426  * @fence: radeon fence object
 427  *
 428  * Check if the requested fence has signaled (all asics).
 429  * Returns true if the fence has signaled or false if it has not.
 430  */
 431 bool radeon_fence_signaled(struct radeon_fence *fence)
 432 {
 433         if (!fence)
 434                 return true;
 435
 436         if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {
 437                 int ret;
 438
 439                 ret = fence_signal(&fence->base);
 440                 if (!ret)
 441                         FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n");
 442                 return true;
 443         }
 444         return false;
 445 }
 446
 447 /**
 448  * radeon_fence_any_seq_signaled - check if any sequence number is signaled
 449  *
 450  * @rdev: radeon device pointer
 451  * @seq: sequence numbers
 452  *
 453  * Check if the last signaled fence sequnce number is >= the requested
 454  * sequence number (all asics).
 455  * Returns true if any has signaled (current value is >= requested value)
 456  * or false if it has not. Helper function for radeon_fence_wait_seq.
 457  */
 458 static bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq)
 459 {
 460         unsigned i;
 461
 462         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 463                 if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i))
 464                         return true;
 465         }
 466         return false;
 467 }
 468
 469 /**
 470  * radeon_fence_wait_seq_timeout - wait for a specific sequence numbers
 471  *
 472  * @rdev: radeon device pointer
 473  * @target_seq: sequence number(s) we want to wait for
 474  * @intr: use interruptable sleep
 475  * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
 476  *
 477  * Wait for the requested sequence number(s) to be written by any ring
 478  * (all asics).  Sequnce number array is indexed by ring id.
 479  * @intr selects whether to use interruptable (true) or non-interruptable
 480  * (false) sleep when waiting for the sequence number.  Helper function
 481  * for radeon_fence_wait_*().
 482  * Returns remaining time if the sequence number has passed, 0 when
 483  * the wait timeout, or an error for all other cases.
 484  * -EDEADLK is returned when a GPU lockup has been detected.
 485  */
 486 static long radeon_fence_wait_seq_timeout(struct radeon_device *rdev,
 487                                           u64 *target_seq, bool intr,
 488                                           long timeout)
 489 {
 490         long r;
 491         int i;
 492
 493         if (radeon_fence_any_seq_signaled(rdev, target_seq))
 494                 return timeout;
 495
 496         /* enable IRQs and tracing */
 497         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 498                 if (!target_seq[i])
 499                         continue;
 500
 501                 trace_radeon_fence_wait_begin(rdev->ddev, i, target_seq[i]);
 502                 radeon_irq_kms_sw_irq_get(rdev, i);
 503         }
 504
 505         if (intr) {
 506                 r = wait_event_interruptible_timeout(rdev->fence_queue, (
 507                         radeon_fence_any_seq_signaled(rdev, target_seq)
 508                          || rdev->needs_reset), timeout);
 509         } else {
 510                 r = wait_event_timeout(rdev->fence_queue, (
 511                         radeon_fence_any_seq_signaled(rdev, target_seq)
 512                          || rdev->needs_reset), timeout);
 513         }
 514
 515         if (rdev->needs_reset)
 516                 r = -EDEADLK;
 517
 518         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 519                 if (!target_seq[i])
 520                         continue;
 521
 522                 radeon_irq_kms_sw_irq_put(rdev, i);
 523                 trace_radeon_fence_wait_end(rdev->ddev, i, target_seq[i]);
 524         }
 525
 526         return r;
 527 }
 528
 529 /**
 530  * radeon_fence_wait_timeout - wait for a fence to signal with timeout
 531  *
 532  * @fence: radeon fence object
 533  * @intr: use interruptible sleep
 534  *
 535  * Wait for the requested fence to signal (all asics).
 536  * @intr selects whether to use interruptable (true) or non-interruptable
 537  * (false) sleep when waiting for the fence.
 538  * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
 539  * Returns remaining time if the sequence number has passed, 0 when
 540  * the wait timeout, or an error for all other cases.
 541  */
 542 long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeout)
 543 {
 544         uint64_t seq[RADEON_NUM_RINGS] = {};
 545         long r;
 546         int r_sig;
 547
 548         /*
 549          * This function should not be called on !radeon fences.
 550          * If this is the case, it would mean this function can
 551          * also be called on radeon fences belonging to another card.
 552          * exclusive_lock is not held in that case.
 553          */
 554         if (WARN_ON_ONCE(!to_radeon_fence(&fence->base)))
 555                 return fence_wait(&fence->base, intr);
 556
 557         seq[fence->ring] = fence->seq;
 558         r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, timeout);
 559         if (r <= 0) {
 560                 return r;
 561         }
 562
 563         r_sig = fence_signal(&fence->base);
 564         if (!r_sig)
 565                 FENCE_TRACE(&fence->base, "signaled from fence_wait\n");
 566         return r;
 567 }
 568
 569 /**
 570  * radeon_fence_wait - wait for a fence to signal
 571  *
 572  * @fence: radeon fence object
 573  * @intr: use interruptible sleep
 574  *
 575  * Wait for the requested fence to signal (all asics).
 576  * @intr selects whether to use interruptable (true) or non-interruptable
 577  * (false) sleep when waiting for the fence.
 578  * Returns 0 if the fence has passed, error for all other cases.
 579  */
 580 int radeon_fence_wait(struct radeon_fence *fence, bool intr)
 581 {
 582         long r = radeon_fence_wait_timeout(fence, intr, MAX_SCHEDULE_TIMEOUT);
 583         if (r > 0) {
 584                 return 0;
 585         } else {
 586                 return r;
 587         }
 588 }
 589
 590 /**
 591  * radeon_fence_wait_any - wait for a fence to signal on any ring
 592  *
 593  * @rdev: radeon device pointer
 594  * @fences: radeon fence object(s)
 595  * @intr: use interruptable sleep
 596  *
 597  * Wait for any requested fence to signal (all asics).  Fence
 598  * array is indexed by ring id.  @intr selects whether to use
 599  * interruptable (true) or non-interruptable (false) sleep when
 600  * waiting for the fences. Used by the suballocator.
 601  * Returns 0 if any fence has passed, error for all other cases.
 602  */
 603 int radeon_fence_wait_any(struct radeon_device *rdev,
 604                           struct radeon_fence **fences,
 605                           bool intr)
 606 {
 607         uint64_t seq[RADEON_NUM_RINGS];
 608         unsigned i, num_rings = 0;
 609         long r;
 610
 611         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 612                 seq[i] = 0;
 613
 614                 if (!fences[i]) {
 615                         continue;
 616                 }
 617
 618                 seq[i] = fences[i]->seq;
 619                 ++num_rings;
 620         }
 621
 622         /* nothing to wait for ? */
 623         if (num_rings == 0)
 624                 return -ENOENT;
 625
 626         r = radeon_fence_wait_seq_timeout(rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
 627         if (r < 0) {
 628                 return r;
 629         }
 630         return 0;
 631 }
 632
 633 /**
 634  * radeon_fence_wait_next - wait for the next fence to signal
 635  *
 636  * @rdev: radeon device pointer
 637  * @ring: ring index the fence is associated with
 638  *
 639  * Wait for the next fence on the requested ring to signal (all asics).
 640  * Returns 0 if the next fence has passed, error for all other cases.
 641  * Caller must hold ring lock.
 642  */
 643 int radeon_fence_wait_next(struct radeon_device *rdev, int ring)
 644 {
 645         uint64_t seq[RADEON_NUM_RINGS] = {};
 646         long r;
 647
 648         seq[ring] = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL;
 649         if (seq[ring] >= rdev->fence_drv[ring].sync_seq[ring]) {
 650                 /* nothing to wait for, last_seq is
 651                    already the last emited fence */
 652                 return -ENOENT;
 653         }
 654         r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
 655         if (r < 0)
 656                 return r;
 657         return 0;
 658 }
 659
 660 /**
 661  * radeon_fence_wait_empty - wait for all fences to signal
 662  *
 663  * @rdev: radeon device pointer
 664  * @ring: ring index the fence is associated with
 665  *
 666  * Wait for all fences on the requested ring to signal (all asics).
 667  * Returns 0 if the fences have passed, error for all other cases.
 668  * Caller must hold ring lock.
 669  */
 670 int radeon_fence_wait_empty(struct radeon_device *rdev, int ring)
 671 {
 672         uint64_t seq[RADEON_NUM_RINGS] = {};
 673         long r;
 674
 675         seq[ring] = rdev->fence_drv[ring].sync_seq[ring];
 676         if (!seq[ring])
 677                 return 0;
 678
 679         r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
 680         if (r < 0) {
 681                 if (r == -EDEADLK)
 682                         return -EDEADLK;
 683
 684                 dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%ld)\n",
 685                         ring, r);
 686         }
 687         return 0;
 688 }
 689
 690 /**
 691  * radeon_fence_ref - take a ref on a fence
 692  *
 693  * @fence: radeon fence object
 694  *
 695  * Take a reference on a fence (all asics).
 696  * Returns the fence.
 697  */
 698 struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)
 699 {
 700         fence_get(&fence->base);
 701         return fence;
 702 }
 703
 704 /**
 705  * radeon_fence_unref - remove a ref on a fence
 706  *
 707  * @fence: radeon fence object
 708  *
 709  * Remove a reference on a fence (all asics).
 710  */
 711 void radeon_fence_unref(struct radeon_fence **fence)
 712 {
 713         struct radeon_fence *tmp = *fence;
 714
 715         *fence = NULL;
 716         if (tmp) {
 717                 fence_put(&tmp->base);
 718         }
 719 }
 720
 721 /**
 722  * radeon_fence_count_emitted - get the count of emitted fences
 723  *
 724  * @rdev: radeon device pointer
 725  * @ring: ring index the fence is associated with
 726  *
 727  * Get the number of fences emitted on the requested ring (all asics).
 728  * Returns the number of emitted fences on the ring.  Used by the
 729  * dynpm code to ring track activity.
 730  */
 731 unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring)
 732 {
 733         uint64_t emitted;
 734
 735         /* We are not protected by ring lock when reading the last sequence
 736          * but it's ok to report slightly wrong fence count here.
 737          */
 738         radeon_fence_process(rdev, ring);
 739         emitted = rdev->fence_drv[ring].sync_seq[ring]
 740                 - atomic64_read(&rdev->fence_drv[ring].last_seq);
 741         /* to avoid 32bits warp around */
 742         if (emitted > 0x10000000) {
 743                 emitted = 0x10000000;
 744         }
 745         return (unsigned)emitted;
 746 }
 747
 748 /**
 749  * radeon_fence_need_sync - do we need a semaphore
 750  *
 751  * @fence: radeon fence object
 752  * @dst_ring: which ring to check against
 753  *
 754  * Check if the fence needs to be synced against another ring
 755  * (all asics).  If so, we need to emit a semaphore.
 756  * Returns true if we need to sync with another ring, false if
 757  * not.
 758  */
 759 bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring)
 760 {
 761         struct radeon_fence_driver *fdrv;
 762
 763         if (!fence) {
 764                 return false;
 765         }
 766
 767         if (fence->ring == dst_ring) {
 768                 return false;
 769         }
 770
 771         /* we are protected by the ring mutex */
 772         fdrv = &fence->rdev->fence_drv[dst_ring];
 773         if (fence->seq <= fdrv->sync_seq[fence->ring]) {
 774                 return false;
 775         }
 776
 777         return true;
 778 }
 779
 780 /**
 781  * radeon_fence_note_sync - record the sync point
 782  *
 783  * @fence: radeon fence object
 784  * @dst_ring: which ring to check against
 785  *
 786  * Note the sequence number at which point the fence will
 787  * be synced with the requested ring (all asics).
 788  */
 789 void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring)
 790 {
 791         struct radeon_fence_driver *dst, *src;
 792         unsigned i;
 793
 794         if (!fence) {
 795                 return;
 796         }
 797
 798         if (fence->ring == dst_ring) {
 799                 return;
 800         }
 801
 802         /* we are protected by the ring mutex */
 803         src = &fence->rdev->fence_drv[fence->ring];
 804         dst = &fence->rdev->fence_drv[dst_ring];
 805         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 806                 if (i == dst_ring) {
 807                         continue;
 808                 }
 809                 dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);
 810         }
 811 }
 812
 813 /**
 814  * radeon_fence_driver_start_ring - make the fence driver
 815  * ready for use on the requested ring.
 816  *
 817  * @rdev: radeon device pointer
 818  * @ring: ring index to start the fence driver on
 819  *
 820  * Make the fence driver ready for processing (all asics).
 821  * Not all asics have all rings, so each asic will only
 822  * start the fence driver on the rings it has.
 823  * Returns 0 for success, errors for failure.
 824  */
 825 int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
 826 {
 827         uint64_t index;
 828         int r;
 829
 830         radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
 831         if (rdev->wb.use_event || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) {
 832                 rdev->fence_drv[ring].scratch_reg = 0;
 833                 if (ring != R600_RING_TYPE_UVD_INDEX) {
 834                         index = R600_WB_EVENT_OFFSET + ring * 4;
 835                         rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4];
 836                         rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr +
 837                                                          index;
 838
 839                 } else {
 840                         /* put fence directly behind firmware */
 841                         index = ALIGN(rdev->uvd_fw->size, 8);
 842                         rdev->fence_drv[ring].cpu_addr = rdev->uvd.cpu_addr + index;
 843                         rdev->fence_drv[ring].gpu_addr = rdev->uvd.gpu_addr + index;
 844                 }
 845
 846         } else {
 847                 r = radeon_scratch_get(rdev, &rdev->fence_drv[ring].scratch_reg);
 848                 if (r) {
 849                         dev_err(rdev->dev, "fence failed to get scratch register\n");
 850                         return r;
 851                 }
 852                 index = RADEON_WB_SCRATCH_OFFSET +
 853                         rdev->fence_drv[ring].scratch_reg -
 854                         rdev->scratch.reg_base;
 855                 rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4];
 856                 rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index;
 857         }
 858         radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring);
 859         rdev->fence_drv[ring].initialized = true;
 860         dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n",
 861                  ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr);
 862         return 0;
 863 }
 864
 865 /**
 866  * radeon_fence_driver_init_ring - init the fence driver
 867  * for the requested ring.
 868  *
 869  * @rdev: radeon device pointer
 870  * @ring: ring index to start the fence driver on
 871  *
 872  * Init the fence driver for the requested ring (all asics).
 873  * Helper function for radeon_fence_driver_init().
 874  */
 875 static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)
 876 {
 877         int i;
 878
 879         rdev->fence_drv[ring].scratch_reg = -1;
 880         rdev->fence_drv[ring].cpu_addr = NULL;
 881         rdev->fence_drv[ring].gpu_addr = 0;
 882         for (i = 0; i < RADEON_NUM_RINGS; ++i)
 883                 rdev->fence_drv[ring].sync_seq[i] = 0;
 884         atomic64_set(&rdev->fence_drv[ring].last_seq, 0);
 885         rdev->fence_drv[ring].initialized = false;
 886         INIT_DELAYED_WORK(&rdev->fence_drv[ring].lockup_work,
 887                           radeon_fence_check_lockup);
 888         rdev->fence_drv[ring].rdev = rdev;
 889 }
 890
 891 /**
 892  * radeon_fence_driver_init - init the fence driver
 893  * for all possible rings.
 894  *
 895  * @rdev: radeon device pointer
 896  *
 897  * Init the fence driver for all possible rings (all asics).
 898  * Not all asics have all rings, so each asic will only
 899  * start the fence driver on the rings it has using
 900  * radeon_fence_driver_start_ring().
 901  * Returns 0 for success.
 902  */
 903 int radeon_fence_driver_init(struct radeon_device *rdev)
 904 {
 905         int ring;
 906
 907         init_waitqueue_head(&rdev->fence_queue);
 908         for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
 909                 radeon_fence_driver_init_ring(rdev, ring);
 910         }
 911         if (radeon_debugfs_fence_init(rdev)) {
 912                 dev_err(rdev->dev, "fence debugfs file creation failed\n");
 913         }
 914         return 0;
 915 }
 916
 917 /**
 918  * radeon_fence_driver_fini - tear down the fence driver
 919  * for all possible rings.
 920  *
 921  * @rdev: radeon device pointer
 922  *
 923  * Tear down the fence driver for all possible rings (all asics).
 924  */
 925 void radeon_fence_driver_fini(struct radeon_device *rdev)
 926 {
 927         int ring, r;
 928
 929         mutex_lock(&rdev->ring_lock);
 930         for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
 931                 if (!rdev->fence_drv[ring].initialized)
 932                         continue;
 933                 r = radeon_fence_wait_empty(rdev, ring);
 934                 if (r) {
 935                         /* no need to trigger GPU reset as we are unloading */
 936                         radeon_fence_driver_force_completion(rdev, ring);
 937                 }
 938                 cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work);
 939                 wake_up_all(&rdev->fence_queue);
 940                 radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
 941                 rdev->fence_drv[ring].initialized = false;
 942         }
 943         mutex_unlock(&rdev->ring_lock);
 944 }
 945
 946 /**
 947  * radeon_fence_driver_force_completion - force all fence waiter to complete
 948  *
 949  * @rdev: radeon device pointer
 950  * @ring: the ring to complete
 951  *
 952  * In case of GPU reset failure make sure no process keep waiting on fence
 953  * that will never complete.
 954  */
 955 void radeon_fence_driver_force_completion(struct radeon_device *rdev, int ring)
 956 {
 957         if (rdev->fence_drv[ring].initialized) {
 958                 radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring);
 959                 cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work);
 960         }
 961 }
 962
 963
 964 /*
 965  * Fence debugfs
 966  */
 967 #if defined(CONFIG_DEBUG_FS)
 968 static int radeon_debugfs_fence_info(struct seq_file *m, void *data)
 969 {
 970         struct drm_info_node *node = (struct drm_info_node *)m->private;
 971         struct drm_device *dev = node->minor->dev;
 972         struct radeon_device *rdev = dev->dev_private;
 973         int i, j;
 974
 975         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 976                 if (!rdev->fence_drv[i].initialized)
 977                         continue;
 978
 979                 radeon_fence_process(rdev, i);
 980
 981                 seq_printf(m, "--- ring %d ---\n", i);
 982                 seq_printf(m, "Last signaled fence 0x%016llx\n",
 983                            (unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq));
 984                 seq_printf(m, "Last emitted        0x%016llx\n",
 985                            rdev->fence_drv[i].sync_seq[i]);
 986
 987                 for (j = 0; j < RADEON_NUM_RINGS; ++j) {
 988                         if (i != j && rdev->fence_drv[j].initialized)
 989                                 seq_printf(m, "Last sync to ring %d 0x%016llx\n",
 990                                            j, rdev->fence_drv[i].sync_seq[j]);
 991                 }
 992         }
 993         return 0;
 994 }
 995
 996 /**
 997  * radeon_debugfs_gpu_reset - manually trigger a gpu reset
 998  *
 999  * Manually trigger a gpu reset at the next fence wait.
1000  */
1001 static int radeon_debugfs_gpu_reset(struct seq_file *m, void *data)
1002 {
1003         struct drm_info_node *node = (struct drm_info_node *) m->private;
1004         struct drm_device *dev = node->minor->dev;
1005         struct radeon_device *rdev = dev->dev_private;
1006
1007         down_read(&rdev->exclusive_lock);
1008         seq_printf(m, "%d\n", rdev->needs_reset);
1009         rdev->needs_reset = true;
1010         wake_up_all(&rdev->fence_queue);
1011         up_read(&rdev->exclusive_lock);
1012
1013         return 0;
1014 }
1015
1016 static struct drm_info_list radeon_debugfs_fence_list[] = {
1017         {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL},
1018         {"radeon_gpu_reset", &radeon_debugfs_gpu_reset, 0, NULL}
1019 };
1020 #endif
1021
1022 int radeon_debugfs_fence_init(struct radeon_device *rdev)
1023 {
1024 #if defined(CONFIG_DEBUG_FS)
1025         return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 2);
1026 #else
1027         return 0;
1028 #endif
1029 }
1030
1031 static const char *radeon_fence_get_driver_name(struct fence *fence)
1032 {
1033         return "radeon";
1034 }
1035
1036 static const char *radeon_fence_get_timeline_name(struct fence *f)
1037 {
1038         struct radeon_fence *fence = to_radeon_fence(f);
1039         switch (fence->ring) {
1040         case RADEON_RING_TYPE_GFX_INDEX: return "radeon.gfx";
1041         case CAYMAN_RING_TYPE_CP1_INDEX: return "radeon.cp1";
1042         case CAYMAN_RING_TYPE_CP2_INDEX: return "radeon.cp2";
1043         case R600_RING_TYPE_DMA_INDEX: return "radeon.dma";
1044         case CAYMAN_RING_TYPE_DMA1_INDEX: return "radeon.dma1";
1045         case R600_RING_TYPE_UVD_INDEX: return "radeon.uvd";
1046         case TN_RING_TYPE_VCE1_INDEX: return "radeon.vce1";
1047         case TN_RING_TYPE_VCE2_INDEX: return "radeon.vce2";
1048         default: WARN_ON_ONCE(1); return "radeon.unk";
1049         }
1050 }
1051
1052 static inline bool radeon_test_signaled(struct radeon_fence *fence)
1053 {
1054         return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
1055 }
1056
1057 struct radeon_wait_cb {
1058         struct fence_cb base;
1059         struct task_struct *task;
1060 };
1061
1062 static void
1063 radeon_fence_wait_cb(struct fence *fence, struct fence_cb *cb)
1064 {
1065         struct radeon_wait_cb *wait =
1066                 container_of(cb, struct radeon_wait_cb, base);
1067
1068         wake_up_process(wait->task);
1069 }
1070
1071 static signed long radeon_fence_default_wait(struct fence *f, bool intr,
1072                                              signed long t)
1073 {
1074         struct radeon_fence *fence = to_radeon_fence(f);
1075         struct radeon_device *rdev = fence->rdev;
1076         struct radeon_wait_cb cb;
1077
1078         cb.task = current;
1079
1080         if (fence_add_callback(f, &cb.base, radeon_fence_wait_cb))
1081                 return t;
1082
1083         while (t > 0) {
1084                 if (intr)
1085                         set_current_state(TASK_INTERRUPTIBLE);
1086                 else
1087                         set_current_state(TASK_UNINTERRUPTIBLE);
1088
1089                 /*
1090                  * radeon_test_signaled must be called after
1091                  * set_current_state to prevent a race with wake_up_process
1092                  */
1093                 if (radeon_test_signaled(fence))
1094                         break;
1095
1096                 if (rdev->needs_reset) {
1097                         t = -EDEADLK;
1098                         break;
1099                 }
1100
1101                 t = schedule_timeout(t);
1102
1103                 if (t > 0 && intr && signal_pending(current))
1104                         t = -ERESTARTSYS;
1105         }
1106
1107         __set_current_state(TASK_RUNNING);
1108         fence_remove_callback(f, &cb.base);
1109
1110         return t;
1111 }
1112
1113 const struct fence_ops radeon_fence_ops = {
1114         .get_driver_name = radeon_fence_get_driver_name,
1115         .get_timeline_name = radeon_fence_get_timeline_name,
1116         .enable_signaling = radeon_fence_enable_signaling,
1117         .signaled = radeon_fence_is_signaled,
1118         .wait = radeon_fence_default_wait,
1119         .release = NULL,
1120 };