2 * Copyright 2009 Jerome Glisse.
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:
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.
21 * The above copyright notice and this permission notice (including the
22 * next paragraph) shall be included in all copies or substantial portions
28 * Jerome Glisse <glisse@freedesktop.org>
32 #include <linux/atomic.h>
33 #include <linux/debugfs.h>
34 #include <linux/firmware.h>
35 #include <linux/kref.h>
36 #include <linux/sched/signal.h>
37 #include <linux/seq_file.h>
38 #include <linux/slab.h>
39 #include <linux/wait.h>
41 #include <drm/drm_device.h>
42 #include <drm/drm_file.h>
45 #include "radeon_reg.h"
46 #include "radeon_trace.h"
49 * Fences mark an event in the GPUs pipeline and are used
50 * for GPU/CPU synchronization. When the fence is written,
51 * it is expected that all buffers associated with that fence
52 * are no longer in use by the associated ring on the GPU and
53 * that the relevant GPU caches have been flushed. Whether
54 * we use a scratch register or memory location depends on the asic
55 * and whether writeback is enabled.
59 * radeon_fence_write - write a fence value
61 * @rdev: radeon_device pointer
62 * @seq: sequence number to write
63 * @ring: ring index the fence is associated with
65 * Writes a fence value to memory or a scratch register (all asics).
67 static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring)
69 struct radeon_fence_driver *drv = &rdev->fence_drv[ring];
71 if (likely(rdev->wb.enabled || !drv->scratch_reg)) {
73 *drv->cpu_addr = cpu_to_le32(seq);
75 WREG32(drv->scratch_reg, seq);
80 * radeon_fence_read - read a fence value
82 * @rdev: radeon_device pointer
83 * @ring: ring index the fence is associated with
85 * Reads a fence value from memory or a scratch register (all asics).
86 * Returns the value of the fence read from memory or register.
88 static u32 radeon_fence_read(struct radeon_device *rdev, int ring)
90 struct radeon_fence_driver *drv = &rdev->fence_drv[ring];
93 if (likely(rdev->wb.enabled || !drv->scratch_reg)) {
95 seq = le32_to_cpu(*drv->cpu_addr);
97 seq = lower_32_bits(atomic64_read(&drv->last_seq));
99 seq = RREG32(drv->scratch_reg);
105 * radeon_fence_schedule_check - schedule lockup check
107 * @rdev: radeon_device pointer
108 * @ring: ring index we should work with
110 * Queues a delayed work item to check for lockups.
112 static void radeon_fence_schedule_check(struct radeon_device *rdev, int ring)
115 * Do not reset the timer here with mod_delayed_work,
116 * this can livelock in an interaction with TTM delayed destroy.
118 queue_delayed_work(system_power_efficient_wq,
119 &rdev->fence_drv[ring].lockup_work,
120 RADEON_FENCE_JIFFIES_TIMEOUT);
124 * radeon_fence_emit - emit a fence on the requested ring
126 * @rdev: radeon_device pointer
127 * @fence: radeon fence object
128 * @ring: ring index the fence is associated with
130 * Emits a fence command on the requested ring (all asics).
131 * Returns 0 on success, -ENOMEM on failure.
133 int radeon_fence_emit(struct radeon_device *rdev,
134 struct radeon_fence **fence,
139 /* we are protected by the ring emission mutex */
140 *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL);
141 if ((*fence) == NULL)
144 (*fence)->rdev = rdev;
145 (*fence)->seq = seq = ++rdev->fence_drv[ring].sync_seq[ring];
146 (*fence)->ring = ring;
147 (*fence)->is_vm_update = false;
148 dma_fence_init(&(*fence)->base, &radeon_fence_ops,
149 &rdev->fence_queue.lock,
150 rdev->fence_context + ring,
152 radeon_fence_ring_emit(rdev, ring, *fence);
153 trace_radeon_fence_emit(rdev_to_drm(rdev), ring, (*fence)->seq);
154 radeon_fence_schedule_check(rdev, ring);
159 * radeon_fence_check_signaled - callback from fence_queue
161 * this function is called with fence_queue lock held, which is also used
162 * for the fence locking itself, so unlocked variants are used for
163 * fence_signal, and remove_wait_queue.
165 static int radeon_fence_check_signaled(wait_queue_entry_t *wait,
166 unsigned int mode, int flags, void *key)
168 struct radeon_fence *fence;
171 fence = container_of(wait, struct radeon_fence, fence_wake);
174 * We cannot use radeon_fence_process here because we're already
175 * in the waitqueue, in a call from wake_up_all.
177 seq = atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq);
178 if (seq >= fence->seq) {
179 dma_fence_signal_locked(&fence->base);
180 radeon_irq_kms_sw_irq_put(fence->rdev, fence->ring);
181 __remove_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake);
182 dma_fence_put(&fence->base);
188 * radeon_fence_activity - check for fence activity
190 * @rdev: radeon_device pointer
191 * @ring: ring index the fence is associated with
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.
197 static bool radeon_fence_activity(struct radeon_device *rdev, int ring)
199 uint64_t seq, last_seq, last_emitted;
200 unsigned int count_loop = 0;
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.
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
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.
224 last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq);
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) {
231 seq |= last_emitted & 0xffffffff00000000LL;
234 if (seq <= last_seq || seq > last_emitted)
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.
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
251 } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);
253 if (seq < last_emitted)
254 radeon_fence_schedule_check(rdev, ring);
260 * radeon_fence_check_lockup - check for hardware lockup
262 * @work: delayed work item
264 * Checks for fence activity and if there is none probe
265 * the hardware if a lockup occured.
267 static void radeon_fence_check_lockup(struct work_struct *work)
269 struct radeon_fence_driver *fence_drv;
270 struct radeon_device *rdev;
273 fence_drv = container_of(work, struct radeon_fence_driver,
275 rdev = fence_drv->rdev;
276 ring = fence_drv - &rdev->fence_drv[0];
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);
284 if (fence_drv->delayed_irq && rdev->irq.installed) {
285 unsigned long irqflags;
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);
293 if (radeon_fence_activity(rdev, ring))
294 wake_up_all(&rdev->fence_queue);
296 else if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) {
298 /* good news we believe it's a lockup */
299 dev_warn(rdev->dev, "GPU lockup (current fence id 0x%016llx last fence id 0x%016llx on ring %d)\n",
300 (uint64_t)atomic64_read(&fence_drv->last_seq),
301 fence_drv->sync_seq[ring], ring);
303 /* remember that we need an reset */
304 rdev->needs_reset = true;
305 wake_up_all(&rdev->fence_queue);
307 up_read(&rdev->exclusive_lock);
311 * radeon_fence_process - process a fence
313 * @rdev: radeon_device pointer
314 * @ring: ring index the fence is associated with
316 * Checks the current fence value and wakes the fence queue
317 * if the sequence number has increased (all asics).
319 void radeon_fence_process(struct radeon_device *rdev, int ring)
321 if (radeon_fence_activity(rdev, ring))
322 wake_up_all(&rdev->fence_queue);
326 * radeon_fence_seq_signaled - check if a fence sequence number has signaled
328 * @rdev: radeon device pointer
329 * @seq: sequence number
330 * @ring: ring index the fence is associated with
332 * Check if the last signaled fence sequnce number is >= the requested
333 * sequence number (all asics).
334 * Returns true if the fence has signaled (current fence value
335 * is >= requested value) or false if it has not (current fence
336 * value is < the requested value. Helper function for
337 * radeon_fence_signaled().
339 static bool radeon_fence_seq_signaled(struct radeon_device *rdev,
340 u64 seq, unsigned int ring)
342 if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq)
345 /* poll new last sequence at least once */
346 radeon_fence_process(rdev, ring);
347 if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq)
353 static bool radeon_fence_is_signaled(struct dma_fence *f)
355 struct radeon_fence *fence = to_radeon_fence(f);
356 struct radeon_device *rdev = fence->rdev;
357 unsigned int ring = fence->ring;
358 u64 seq = fence->seq;
360 if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq)
363 if (down_read_trylock(&rdev->exclusive_lock)) {
364 radeon_fence_process(rdev, ring);
365 up_read(&rdev->exclusive_lock);
367 if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq)
374 * radeon_fence_enable_signaling - enable signalling on fence
377 * This function is called with fence_queue lock held, and adds a callback
378 * to fence_queue that checks if this fence is signaled, and if so it
379 * signals the fence and removes itself.
381 static bool radeon_fence_enable_signaling(struct dma_fence *f)
383 struct radeon_fence *fence = to_radeon_fence(f);
384 struct radeon_device *rdev = fence->rdev;
386 if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq)
389 if (down_read_trylock(&rdev->exclusive_lock)) {
390 radeon_irq_kms_sw_irq_get(rdev, fence->ring);
392 if (radeon_fence_activity(rdev, fence->ring))
393 wake_up_all_locked(&rdev->fence_queue);
395 /* did fence get signaled after we enabled the sw irq? */
396 if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq) {
397 radeon_irq_kms_sw_irq_put(rdev, fence->ring);
398 up_read(&rdev->exclusive_lock);
402 up_read(&rdev->exclusive_lock);
404 /* we're probably in a lockup, lets not fiddle too much */
405 if (radeon_irq_kms_sw_irq_get_delayed(rdev, fence->ring))
406 rdev->fence_drv[fence->ring].delayed_irq = true;
407 radeon_fence_schedule_check(rdev, fence->ring);
410 fence->fence_wake.flags = 0;
411 fence->fence_wake.private = NULL;
412 fence->fence_wake.func = radeon_fence_check_signaled;
413 __add_wait_queue(&rdev->fence_queue, &fence->fence_wake);
419 * radeon_fence_signaled - check if a fence has signaled
421 * @fence: radeon fence object
423 * Check if the requested fence has signaled (all asics).
424 * Returns true if the fence has signaled or false if it has not.
426 bool radeon_fence_signaled(struct radeon_fence *fence)
431 if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {
432 dma_fence_signal(&fence->base);
439 * radeon_fence_any_seq_signaled - check if any sequence number is signaled
441 * @rdev: radeon device pointer
442 * @seq: sequence numbers
444 * Check if the last signaled fence sequnce number is >= the requested
445 * sequence number (all asics).
446 * Returns true if any has signaled (current value is >= requested value)
447 * or false if it has not. Helper function for radeon_fence_wait_seq.
449 static bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq)
453 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
454 if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i))
461 * radeon_fence_wait_seq_timeout - wait for a specific sequence numbers
463 * @rdev: radeon device pointer
464 * @target_seq: sequence number(s) we want to wait for
465 * @intr: use interruptable sleep
466 * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
468 * Wait for the requested sequence number(s) to be written by any ring
469 * (all asics). Sequnce number array is indexed by ring id.
470 * @intr selects whether to use interruptable (true) or non-interruptable
471 * (false) sleep when waiting for the sequence number. Helper function
472 * for radeon_fence_wait_*().
473 * Returns remaining time if the sequence number has passed, 0 when
474 * the wait timeout, or an error for all other cases.
475 * -EDEADLK is returned when a GPU lockup has been detected.
477 static long radeon_fence_wait_seq_timeout(struct radeon_device *rdev,
478 u64 *target_seq, bool intr,
484 if (radeon_fence_any_seq_signaled(rdev, target_seq))
487 /* enable IRQs and tracing */
488 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
492 trace_radeon_fence_wait_begin(rdev_to_drm(rdev), i, target_seq[i]);
493 radeon_irq_kms_sw_irq_get(rdev, i);
497 r = wait_event_interruptible_timeout(rdev->fence_queue, (
498 radeon_fence_any_seq_signaled(rdev, target_seq)
499 || rdev->needs_reset), timeout);
501 r = wait_event_timeout(rdev->fence_queue, (
502 radeon_fence_any_seq_signaled(rdev, target_seq)
503 || rdev->needs_reset), timeout);
506 if (rdev->needs_reset)
509 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
513 radeon_irq_kms_sw_irq_put(rdev, i);
514 trace_radeon_fence_wait_end(rdev_to_drm(rdev), i, target_seq[i]);
521 * radeon_fence_wait_timeout - wait for a fence to signal with timeout
523 * @fence: radeon fence object
524 * @intr: use interruptible sleep
526 * Wait for the requested fence to signal (all asics).
527 * @intr selects whether to use interruptable (true) or non-interruptable
528 * (false) sleep when waiting for the fence.
529 * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
530 * Returns remaining time if the sequence number has passed, 0 when
531 * the wait timeout, or an error for all other cases.
533 long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeout)
535 uint64_t seq[RADEON_NUM_RINGS] = {};
539 * This function should not be called on !radeon fences.
540 * If this is the case, it would mean this function can
541 * also be called on radeon fences belonging to another card.
542 * exclusive_lock is not held in that case.
544 if (WARN_ON_ONCE(!to_radeon_fence(&fence->base)))
545 return dma_fence_wait(&fence->base, intr);
547 seq[fence->ring] = fence->seq;
548 r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, timeout);
552 dma_fence_signal(&fence->base);
557 * radeon_fence_wait - wait for a fence to signal
559 * @fence: radeon fence object
560 * @intr: use interruptible sleep
562 * Wait for the requested fence to signal (all asics).
563 * @intr selects whether to use interruptable (true) or non-interruptable
564 * (false) sleep when waiting for the fence.
565 * Returns 0 if the fence has passed, error for all other cases.
567 int radeon_fence_wait(struct radeon_fence *fence, bool intr)
569 long r = radeon_fence_wait_timeout(fence, intr, MAX_SCHEDULE_TIMEOUT);
578 * radeon_fence_wait_any - wait for a fence to signal on any ring
580 * @rdev: radeon device pointer
581 * @fences: radeon fence object(s)
582 * @intr: use interruptable sleep
584 * Wait for any requested fence to signal (all asics). Fence
585 * array is indexed by ring id. @intr selects whether to use
586 * interruptable (true) or non-interruptable (false) sleep when
587 * waiting for the fences. Used by the suballocator.
588 * Returns 0 if any fence has passed, error for all other cases.
590 int radeon_fence_wait_any(struct radeon_device *rdev,
591 struct radeon_fence **fences,
594 uint64_t seq[RADEON_NUM_RINGS];
595 unsigned int i, num_rings = 0;
598 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
604 seq[i] = fences[i]->seq;
608 /* nothing to wait for ? */
612 r = radeon_fence_wait_seq_timeout(rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
620 * radeon_fence_wait_next - wait for the next fence to signal
622 * @rdev: radeon device pointer
623 * @ring: ring index the fence is associated with
625 * Wait for the next fence on the requested ring to signal (all asics).
626 * Returns 0 if the next fence has passed, error for all other cases.
627 * Caller must hold ring lock.
629 int radeon_fence_wait_next(struct radeon_device *rdev, int ring)
631 uint64_t seq[RADEON_NUM_RINGS] = {};
634 seq[ring] = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL;
635 if (seq[ring] >= rdev->fence_drv[ring].sync_seq[ring]) {
636 /* nothing to wait for, last_seq is already
637 * the last emited fence
642 r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
650 * radeon_fence_wait_empty - wait for all fences to signal
652 * @rdev: radeon device pointer
653 * @ring: ring index the fence is associated with
655 * Wait for all fences on the requested ring to signal (all asics).
656 * Returns 0 if the fences have passed, error for all other cases.
657 * Caller must hold ring lock.
659 int radeon_fence_wait_empty(struct radeon_device *rdev, int ring)
661 uint64_t seq[RADEON_NUM_RINGS] = {};
664 seq[ring] = rdev->fence_drv[ring].sync_seq[ring];
668 r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
673 dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%ld)\n",
680 * radeon_fence_ref - take a ref on a fence
682 * @fence: radeon fence object
684 * Take a reference on a fence (all asics).
687 struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)
689 dma_fence_get(&fence->base);
694 * radeon_fence_unref - remove a ref on a fence
696 * @fence: radeon fence object
698 * Remove a reference on a fence (all asics).
700 void radeon_fence_unref(struct radeon_fence **fence)
702 struct radeon_fence *tmp = *fence;
706 dma_fence_put(&tmp->base);
710 * radeon_fence_count_emitted - get the count of emitted fences
712 * @rdev: radeon device pointer
713 * @ring: ring index the fence is associated with
715 * Get the number of fences emitted on the requested ring (all asics).
716 * Returns the number of emitted fences on the ring. Used by the
717 * dynpm code to ring track activity.
719 unsigned int radeon_fence_count_emitted(struct radeon_device *rdev, int ring)
723 /* We are not protected by ring lock when reading the last sequence
724 * but it's ok to report slightly wrong fence count here.
726 radeon_fence_process(rdev, ring);
727 emitted = rdev->fence_drv[ring].sync_seq[ring]
728 - atomic64_read(&rdev->fence_drv[ring].last_seq);
729 /* to avoid 32bits warp around */
730 if (emitted > 0x10000000)
731 emitted = 0x10000000;
733 return (unsigned int)emitted;
737 * radeon_fence_need_sync - do we need a semaphore
739 * @fence: radeon fence object
740 * @dst_ring: which ring to check against
742 * Check if the fence needs to be synced against another ring
743 * (all asics). If so, we need to emit a semaphore.
744 * Returns true if we need to sync with another ring, false if
747 bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring)
749 struct radeon_fence_driver *fdrv;
754 if (fence->ring == dst_ring)
757 /* we are protected by the ring mutex */
758 fdrv = &fence->rdev->fence_drv[dst_ring];
759 if (fence->seq <= fdrv->sync_seq[fence->ring])
766 * radeon_fence_note_sync - record the sync point
768 * @fence: radeon fence object
769 * @dst_ring: which ring to check against
771 * Note the sequence number at which point the fence will
772 * be synced with the requested ring (all asics).
774 void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring)
776 struct radeon_fence_driver *dst, *src;
782 if (fence->ring == dst_ring)
785 /* we are protected by the ring mutex */
786 src = &fence->rdev->fence_drv[fence->ring];
787 dst = &fence->rdev->fence_drv[dst_ring];
788 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
792 dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);
797 * radeon_fence_driver_start_ring - make the fence driver
798 * ready for use on the requested ring.
800 * @rdev: radeon device pointer
801 * @ring: ring index to start the fence driver on
803 * Make the fence driver ready for processing (all asics).
804 * Not all asics have all rings, so each asic will only
805 * start the fence driver on the rings it has.
806 * Returns 0 for success, errors for failure.
808 int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
813 radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
814 if (rdev->wb.use_event || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) {
815 rdev->fence_drv[ring].scratch_reg = 0;
816 if (ring != R600_RING_TYPE_UVD_INDEX) {
817 index = R600_WB_EVENT_OFFSET + ring * 4;
818 rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4];
819 rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr +
823 /* put fence directly behind firmware */
824 index = ALIGN(rdev->uvd_fw->size, 8);
825 rdev->fence_drv[ring].cpu_addr = rdev->uvd.cpu_addr + index;
826 rdev->fence_drv[ring].gpu_addr = rdev->uvd.gpu_addr + index;
830 r = radeon_scratch_get(rdev, &rdev->fence_drv[ring].scratch_reg);
832 dev_err(rdev->dev, "fence failed to get scratch register\n");
835 index = RADEON_WB_SCRATCH_OFFSET +
836 rdev->fence_drv[ring].scratch_reg -
837 rdev->scratch.reg_base;
838 rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4];
839 rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index;
841 radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring);
842 rdev->fence_drv[ring].initialized = true;
843 dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx\n",
844 ring, rdev->fence_drv[ring].gpu_addr);
849 * radeon_fence_driver_init_ring - init the fence driver
850 * for the requested ring.
852 * @rdev: radeon device pointer
853 * @ring: ring index to start the fence driver on
855 * Init the fence driver for the requested ring (all asics).
856 * Helper function for radeon_fence_driver_init().
858 static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)
862 rdev->fence_drv[ring].scratch_reg = -1;
863 rdev->fence_drv[ring].cpu_addr = NULL;
864 rdev->fence_drv[ring].gpu_addr = 0;
865 for (i = 0; i < RADEON_NUM_RINGS; ++i)
866 rdev->fence_drv[ring].sync_seq[i] = 0;
867 atomic64_set(&rdev->fence_drv[ring].last_seq, 0);
868 rdev->fence_drv[ring].initialized = false;
869 INIT_DELAYED_WORK(&rdev->fence_drv[ring].lockup_work,
870 radeon_fence_check_lockup);
871 rdev->fence_drv[ring].rdev = rdev;
875 * radeon_fence_driver_init - init the fence driver
876 * for all possible rings.
878 * @rdev: radeon device pointer
880 * Init the fence driver for all possible rings (all asics).
881 * Not all asics have all rings, so each asic will only
882 * start the fence driver on the rings it has using
883 * radeon_fence_driver_start_ring().
885 void radeon_fence_driver_init(struct radeon_device *rdev)
889 init_waitqueue_head(&rdev->fence_queue);
890 for (ring = 0; ring < RADEON_NUM_RINGS; ring++)
891 radeon_fence_driver_init_ring(rdev, ring);
893 radeon_debugfs_fence_init(rdev);
897 * radeon_fence_driver_fini - tear down the fence driver
898 * for all possible rings.
900 * @rdev: radeon device pointer
902 * Tear down the fence driver for all possible rings (all asics).
904 void radeon_fence_driver_fini(struct radeon_device *rdev)
908 mutex_lock(&rdev->ring_lock);
909 for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
910 if (!rdev->fence_drv[ring].initialized)
912 r = radeon_fence_wait_empty(rdev, ring);
914 /* no need to trigger GPU reset as we are unloading */
915 radeon_fence_driver_force_completion(rdev, ring);
917 cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work);
918 wake_up_all(&rdev->fence_queue);
919 radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
920 rdev->fence_drv[ring].initialized = false;
922 mutex_unlock(&rdev->ring_lock);
926 * radeon_fence_driver_force_completion - force all fence waiter to complete
928 * @rdev: radeon device pointer
929 * @ring: the ring to complete
931 * In case of GPU reset failure make sure no process keep waiting on fence
932 * that will never complete.
934 void radeon_fence_driver_force_completion(struct radeon_device *rdev, int ring)
936 if (rdev->fence_drv[ring].initialized) {
937 radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring);
938 cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work);
946 #if defined(CONFIG_DEBUG_FS)
947 static int radeon_debugfs_fence_info_show(struct seq_file *m, void *data)
949 struct radeon_device *rdev = m->private;
952 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
953 if (!rdev->fence_drv[i].initialized)
956 radeon_fence_process(rdev, i);
958 seq_printf(m, "--- ring %d ---\n", i);
959 seq_printf(m, "Last signaled fence 0x%016llx\n",
960 (unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq));
961 seq_printf(m, "Last emitted 0x%016llx\n",
962 rdev->fence_drv[i].sync_seq[i]);
964 for (j = 0; j < RADEON_NUM_RINGS; ++j) {
965 if (i != j && rdev->fence_drv[j].initialized)
966 seq_printf(m, "Last sync to ring %d 0x%016llx\n",
967 j, rdev->fence_drv[i].sync_seq[j]);
974 * radeon_debugfs_gpu_reset - manually trigger a gpu reset
976 * Manually trigger a gpu reset at the next fence wait.
978 static int radeon_debugfs_gpu_reset(void *data, u64 *val)
980 struct radeon_device *rdev = (struct radeon_device *)data;
982 down_read(&rdev->exclusive_lock);
983 *val = rdev->needs_reset;
984 rdev->needs_reset = true;
985 wake_up_all(&rdev->fence_queue);
986 up_read(&rdev->exclusive_lock);
990 DEFINE_SHOW_ATTRIBUTE(radeon_debugfs_fence_info);
991 DEFINE_DEBUGFS_ATTRIBUTE(radeon_debugfs_gpu_reset_fops,
992 radeon_debugfs_gpu_reset, NULL, "%lld\n");
995 void radeon_debugfs_fence_init(struct radeon_device *rdev)
997 #if defined(CONFIG_DEBUG_FS)
998 struct dentry *root = rdev_to_drm(rdev)->primary->debugfs_root;
1000 debugfs_create_file("radeon_gpu_reset", 0444, root, rdev,
1001 &radeon_debugfs_gpu_reset_fops);
1002 debugfs_create_file("radeon_fence_info", 0444, root, rdev,
1003 &radeon_debugfs_fence_info_fops);
1009 static const char *radeon_fence_get_driver_name(struct dma_fence *fence)
1014 static const char *radeon_fence_get_timeline_name(struct dma_fence *f)
1016 struct radeon_fence *fence = to_radeon_fence(f);
1018 switch (fence->ring) {
1019 case RADEON_RING_TYPE_GFX_INDEX: return "radeon.gfx";
1020 case CAYMAN_RING_TYPE_CP1_INDEX: return "radeon.cp1";
1021 case CAYMAN_RING_TYPE_CP2_INDEX: return "radeon.cp2";
1022 case R600_RING_TYPE_DMA_INDEX: return "radeon.dma";
1023 case CAYMAN_RING_TYPE_DMA1_INDEX: return "radeon.dma1";
1024 case R600_RING_TYPE_UVD_INDEX: return "radeon.uvd";
1025 case TN_RING_TYPE_VCE1_INDEX: return "radeon.vce1";
1026 case TN_RING_TYPE_VCE2_INDEX: return "radeon.vce2";
1029 return "radeon.unk";
1033 static inline bool radeon_test_signaled(struct radeon_fence *fence)
1035 return test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
1038 struct radeon_wait_cb {
1039 struct dma_fence_cb base;
1040 struct task_struct *task;
1044 radeon_fence_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
1046 struct radeon_wait_cb *wait =
1047 container_of(cb, struct radeon_wait_cb, base);
1049 wake_up_process(wait->task);
1052 static signed long radeon_fence_default_wait(struct dma_fence *f, bool intr,
1055 struct radeon_fence *fence = to_radeon_fence(f);
1056 struct radeon_device *rdev = fence->rdev;
1057 struct radeon_wait_cb cb;
1061 if (dma_fence_add_callback(f, &cb.base, radeon_fence_wait_cb))
1066 set_current_state(TASK_INTERRUPTIBLE);
1068 set_current_state(TASK_UNINTERRUPTIBLE);
1071 * radeon_test_signaled must be called after
1072 * set_current_state to prevent a race with wake_up_process
1074 if (radeon_test_signaled(fence))
1077 if (rdev->needs_reset) {
1082 t = schedule_timeout(t);
1084 if (t > 0 && intr && signal_pending(current))
1088 __set_current_state(TASK_RUNNING);
1089 dma_fence_remove_callback(f, &cb.base);
1094 const struct dma_fence_ops radeon_fence_ops = {
1095 .get_driver_name = radeon_fence_get_driver_name,
1096 .get_timeline_name = radeon_fence_get_timeline_name,
1097 .enable_signaling = radeon_fence_enable_signaling,
1098 .signaled = radeon_fence_is_signaled,
1099 .wait = radeon_fence_default_wait,