diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 2c3547f4cea4..9e7506965cab 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -120,6 +120,7 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, am_fence = kzalloc(sizeof(*am_fence), GFP_KERNEL); if (!am_fence) return -ENOMEM; + am_fence->context = 0; } else { am_fence = af; } @@ -127,6 +128,7 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, am_fence->ring = ring; seq = ++ring->fence_drv.sync_seq; + am_fence->seq = seq; if (af) { dma_fence_init(fence, &amdgpu_job_fence_ops, &ring->fence_drv.lock, @@ -141,6 +143,7 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr, seq, flags | AMDGPU_FENCE_FLAG_INT); + amdgpu_fence_save_wptr(fence); pm_runtime_get_noresume(adev_to_drm(adev)->dev); ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask]; if (unlikely(rcu_dereference_protected(*ptr, 1))) { @@ -253,6 +256,7 @@ bool amdgpu_fence_process(struct amdgpu_ring *ring) do { struct dma_fence *fence, **ptr; + struct amdgpu_fence *am_fence; ++last_seq; last_seq &= drv->num_fences_mask; @@ -265,6 +269,12 @@ bool amdgpu_fence_process(struct amdgpu_ring *ring) if (!fence) continue; + /* Save the wptr in the fence driver so we know what the last processed + * wptr was. This is required for re-emitting the ring state for + * queues that are reset but are not guilty and thus have no guilty fence. + */ + am_fence = container_of(fence, struct amdgpu_fence, base); + drv->signalled_wptr = am_fence->wptr; dma_fence_signal(fence); dma_fence_put(fence); pm_runtime_mark_last_busy(adev_to_drm(adev)->dev); @@ -727,6 +737,86 @@ void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring) amdgpu_fence_process(ring); } + +/** + * Kernel queue reset handling + * + * The driver can reset individual queues for most engines, but those queues + * may contain work from multiple contexts. Resetting the queue will reset + * lose all of that state. In order to minimize the collateral damage, the + * driver will save the ring contents which are not associated with the guilty + * context prior to resetting the queue. After resetting the queue the queue + * contents from the other contexts is re-emitted to the rings so that it can + * be processed by the engine. To handle this, we save the queue's write + * pointer (wptr) in the fences associated with each context. If we get a + * queue timeout, we can then use the wptrs from the fences to determine + * which data needs to be saved out of the queue's ring buffer. + */ + +/** + * amdgpu_fence_driver_guilty_force_completion - force signal of specified sequence + * + * @fence: fence of the ring to signal + * + */ +void amdgpu_fence_driver_guilty_force_completion(struct amdgpu_fence *fence) +{ + dma_fence_set_error(&fence->base, -ETIME); + amdgpu_fence_write(fence->ring, fence->seq); + amdgpu_fence_process(fence->ring); +} + +void amdgpu_fence_save_wptr(struct dma_fence *fence) +{ + struct amdgpu_fence *am_fence = container_of(fence, struct amdgpu_fence, base); + + am_fence->wptr = am_fence->ring->wptr; +} + +static void amdgpu_ring_backup_unprocessed_command(struct amdgpu_ring *ring, + u64 start_wptr, u32 end_wptr) +{ + unsigned int first_idx = start_wptr & ring->buf_mask; + unsigned int last_idx = end_wptr & ring->buf_mask; + unsigned int i; + + /* Backup the contents of the ring buffer. */ + for (i = first_idx; i != last_idx; ++i, i &= ring->buf_mask) + ring->ring_backup[ring->ring_backup_entries_to_copy++] = ring->ring[i]; +} + +void amdgpu_ring_backup_unprocessed_commands(struct amdgpu_ring *ring, + struct amdgpu_fence *guilty_fence) +{ + struct dma_fence *unprocessed; + struct dma_fence __rcu **ptr; + struct amdgpu_fence *fence; + u64 wptr, i, seqno; + + seqno = amdgpu_fence_read(ring); + wptr = ring->fence_drv.signalled_wptr; + ring->ring_backup_entries_to_copy = 0; + + for (i = seqno + 1; i <= ring->fence_drv.sync_seq; ++i) { + ptr = &ring->fence_drv.fences[i & ring->fence_drv.num_fences_mask]; + rcu_read_lock(); + unprocessed = rcu_dereference(*ptr); + + if (unprocessed && !dma_fence_is_signaled(unprocessed)) { + fence = container_of(unprocessed, struct amdgpu_fence, base); + + /* save everything if the ring is not guilty, otherwise + * just save the content from other contexts. + */ + if (!guilty_fence || (fence->context != guilty_fence->context)) + amdgpu_ring_backup_unprocessed_command(ring, wptr, + fence->wptr); + wptr = fence->wptr; + } + rcu_read_unlock(); + } +} + /* * Common fence implementation */ |