diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c new file mode 100644 index 000000000000..21accbdd0a1a --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c @@ -0,0 +1,234 @@ +/* + * Copyright 2014 Advanced Micro Devices, Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + */ +/* + * Authors: + * Christian König <christian.koenig@amd.com> + */ + +#include <drm/drmP.h> +#include "amdgpu.h" +#include "amdgpu_trace.h" + +/** + * amdgpu_sync_create - zero init sync object + * + * @sync: sync object to initialize + * + * Just clear the sync object for now. + */ +void amdgpu_sync_create(struct amdgpu_sync *sync) +{ + unsigned i; + + for (i = 0; i < AMDGPU_NUM_SYNCS; ++i) + sync->semaphores[i] = NULL; + + for (i = 0; i < AMDGPU_MAX_RINGS; ++i) + sync->sync_to[i] = NULL; + + sync->last_vm_update = NULL; +} + +/** + * amdgpu_sync_fence - use the semaphore to sync to a fence + * + * @sync: sync object to add fence to + * @fence: fence to sync to + * + * Sync to the fence using the semaphore objects + */ +void amdgpu_sync_fence(struct amdgpu_sync *sync, + struct amdgpu_fence *fence) +{ + struct amdgpu_fence *other; + + if (!fence) + return; + + other = sync->sync_to[fence->ring->idx]; + sync->sync_to[fence->ring->idx] = amdgpu_fence_ref( + amdgpu_fence_later(fence, other)); + amdgpu_fence_unref(&other); + + if (fence->owner == AMDGPU_FENCE_OWNER_VM) { + other = sync->last_vm_update; + sync->last_vm_update = amdgpu_fence_ref( + amdgpu_fence_later(fence, other)); + amdgpu_fence_unref(&other); + } +} + +/** + * amdgpu_sync_resv - use the semaphores to sync to a reservation object + * + * @sync: sync object to add fences from reservation object to + * @resv: reservation object with embedded fence + * @shared: true if we should only sync to the exclusive fence + * + * Sync to the fence using the semaphore objects + */ +int amdgpu_sync_resv(struct amdgpu_device *adev, + struct amdgpu_sync *sync, + struct reservation_object *resv, + void *owner) +{ + struct reservation_object_list *flist; + struct fence *f; + struct amdgpu_fence *fence; + unsigned i; + int r = 0; + + if (resv == NULL) + return -EINVAL; + + /* always sync to the exclusive fence */ + f = reservation_object_get_excl(resv); + fence = f ? to_amdgpu_fence(f) : NULL; + if (fence && fence->ring->adev == adev) + amdgpu_sync_fence(sync, fence); + else if (f) + r = fence_wait(f, true); + + flist = reservation_object_get_list(resv); + if (!flist || r) + return r; + + for (i = 0; i < flist->shared_count; ++i) { + f = rcu_dereference_protected(flist->shared[i], + reservation_object_held(resv)); + fence = f ? to_amdgpu_fence(f) : NULL; + if (fence && fence->ring->adev == adev) { + if (fence->owner != owner || + fence->owner == AMDGPU_FENCE_OWNER_UNDEFINED) + amdgpu_sync_fence(sync, fence); + } else if (f) { + r = fence_wait(f, true); + if (r) + break; + } + } + return r; +} + +/** + * amdgpu_sync_rings - sync ring to all registered fences + * + * @sync: sync object to use + * @ring: ring that needs sync + * + * Ensure that all registered fences are signaled before letting + * the ring continue. The caller must hold the ring lock. + */ +int amdgpu_sync_rings(struct amdgpu_sync *sync, + struct amdgpu_ring *ring) +{ + struct amdgpu_device *adev = ring->adev; + unsigned count = 0; + int i, r; + + for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { + struct amdgpu_fence *fence = sync->sync_to[i]; + struct amdgpu_semaphore *semaphore; + struct amdgpu_ring *other = adev->rings[i]; + + /* check if we really need to sync */ + if (!amdgpu_fence_need_sync(fence, ring)) + continue; + + /* prevent GPU deadlocks */ + if (!other->ready) { + dev_err(adev->dev, "Syncing to a disabled ring!"); + return -EINVAL; + } + + if (count >= AMDGPU_NUM_SYNCS) { + /* not enough room, wait manually */ + r = amdgpu_fence_wait(fence, false); + if (r) + return r; + continue; + } + r = amdgpu_semaphore_create(adev, &semaphore); + if (r) + return r; + + sync->semaphores[count++] = semaphore; + + /* allocate enough space for sync command */ + r = amdgpu_ring_alloc(other, 16); + if (r) + return r; + + /* emit the signal semaphore */ + if (!amdgpu_semaphore_emit_signal(other, semaphore)) { + /* signaling wasn't successful wait manually */ + amdgpu_ring_undo(other); + r = amdgpu_fence_wait(fence, false); + if (r) + return r; + continue; + } + + /* we assume caller has already allocated space on waiters ring */ + if (!amdgpu_semaphore_emit_wait(ring, semaphore)) { + /* waiting wasn't successful wait manually */ + amdgpu_ring_undo(other); + r = amdgpu_fence_wait(fence, false); + if (r) + return r; + continue; + } + + amdgpu_ring_commit(other); + amdgpu_fence_note_sync(fence, ring); + } + + return 0; +} + +/** + * amdgpu_sync_free - free the sync object + * + * @adev: amdgpu_device pointer + * @sync: sync object to use + * @fence: fence to use for the free + * + * Free the sync object by freeing all semaphores in it. + */ +void amdgpu_sync_free(struct amdgpu_device *adev, + struct amdgpu_sync *sync, + struct amdgpu_fence *fence) +{ + unsigned i; + + for (i = 0; i < AMDGPU_NUM_SYNCS; ++i) + amdgpu_semaphore_free(adev, &sync->semaphores[i], fence); + + for (i = 0; i < AMDGPU_MAX_RINGS; ++i) + amdgpu_fence_unref(&sync->sync_to[i]); + + amdgpu_fence_unref(&sync->last_vm_update); +} |