| /* |
| * 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 "radeon.h" |
| #include "radeon_trace.h" |
| |
| /** |
| * radeon_sync_create - zero init sync object |
| * |
| * @sync: sync object to initialize |
| * |
| * Just clear the sync object for now. |
| */ |
| void radeon_sync_create(struct radeon_sync *sync) |
| { |
| unsigned i; |
| |
| for (i = 0; i < RADEON_NUM_SYNCS; ++i) |
| sync->semaphores[i] = NULL; |
| |
| for (i = 0; i < RADEON_NUM_RINGS; ++i) |
| sync->sync_to[i] = NULL; |
| |
| sync->last_vm_update = NULL; |
| } |
| |
| /** |
| * radeon_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 radeon_sync_fence(struct radeon_sync *sync, |
| struct radeon_fence *fence) |
| { |
| struct radeon_fence *other; |
| |
| if (!fence) |
| return; |
| |
| other = sync->sync_to[fence->ring]; |
| sync->sync_to[fence->ring] = radeon_fence_later(fence, other); |
| |
| if (fence->is_vm_update) { |
| other = sync->last_vm_update; |
| sync->last_vm_update = radeon_fence_later(fence, other); |
| } |
| } |
| |
| /** |
| * radeon_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 radeon_sync_resv(struct radeon_device *rdev, |
| struct radeon_sync *sync, |
| struct reservation_object *resv, |
| bool shared) |
| { |
| struct reservation_object_list *flist; |
| struct dma_fence *f; |
| struct radeon_fence *fence; |
| unsigned i; |
| int r = 0; |
| |
| /* always sync to the exclusive fence */ |
| f = reservation_object_get_excl(resv); |
| fence = f ? to_radeon_fence(f) : NULL; |
| if (fence && fence->rdev == rdev) |
| radeon_sync_fence(sync, fence); |
| else if (f) |
| r = dma_fence_wait(f, true); |
| |
| flist = reservation_object_get_list(resv); |
| if (shared || !flist || r) |
| return r; |
| |
| for (i = 0; i < flist->shared_count; ++i) { |
| f = rcu_dereference_protected(flist->shared[i], |
| reservation_object_held(resv)); |
| fence = to_radeon_fence(f); |
| if (fence && fence->rdev == rdev) |
| radeon_sync_fence(sync, fence); |
| else |
| r = dma_fence_wait(f, true); |
| |
| if (r) |
| break; |
| } |
| return r; |
| } |
| |
| /** |
| * radeon_sync_rings - sync ring to all registered fences |
| * |
| * @rdev: radeon_device pointer |
| * @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 radeon_sync_rings(struct radeon_device *rdev, |
| struct radeon_sync *sync, |
| int ring) |
| { |
| unsigned count = 0; |
| int i, r; |
| |
| for (i = 0; i < RADEON_NUM_RINGS; ++i) { |
| struct radeon_fence *fence = sync->sync_to[i]; |
| struct radeon_semaphore *semaphore; |
| |
| /* check if we really need to sync */ |
| if (!radeon_fence_need_sync(fence, ring)) |
| continue; |
| |
| /* prevent GPU deadlocks */ |
| if (!rdev->ring[i].ready) { |
| dev_err(rdev->dev, "Syncing to a disabled ring!"); |
| return -EINVAL; |
| } |
| |
| if (count >= RADEON_NUM_SYNCS) { |
| /* not enough room, wait manually */ |
| r = radeon_fence_wait(fence, false); |
| if (r) |
| return r; |
| continue; |
| } |
| r = radeon_semaphore_create(rdev, &semaphore); |
| if (r) |
| return r; |
| |
| sync->semaphores[count++] = semaphore; |
| |
| /* allocate enough space for sync command */ |
| r = radeon_ring_alloc(rdev, &rdev->ring[i], 16); |
| if (r) |
| return r; |
| |
| /* emit the signal semaphore */ |
| if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) { |
| /* signaling wasn't successful wait manually */ |
| radeon_ring_undo(&rdev->ring[i]); |
| r = radeon_fence_wait(fence, false); |
| if (r) |
| return r; |
| continue; |
| } |
| |
| /* we assume caller has already allocated space on waiters ring */ |
| if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) { |
| /* waiting wasn't successful wait manually */ |
| radeon_ring_undo(&rdev->ring[i]); |
| r = radeon_fence_wait(fence, false); |
| if (r) |
| return r; |
| continue; |
| } |
| |
| radeon_ring_commit(rdev, &rdev->ring[i], false); |
| radeon_fence_note_sync(fence, ring); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * radeon_sync_free - free the sync object |
| * |
| * @rdev: radeon_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 radeon_sync_free(struct radeon_device *rdev, |
| struct radeon_sync *sync, |
| struct radeon_fence *fence) |
| { |
| unsigned i; |
| |
| for (i = 0; i < RADEON_NUM_SYNCS; ++i) |
| radeon_semaphore_free(rdev, &sync->semaphores[i], fence); |
| } |