--- /dev/null
+/*
+ * 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 "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 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 = 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 = 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);
+}
Code Review / kvmfornfv.git / blobdiff