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authorChristian König <deathsimple@vodafone.de>2012-05-10 16:46:43 +0200
committerChristian König <deathsimple@vodafone.de>2012-06-21 09:38:40 +0200
commit220907d9835ce5181b9f782c862b1ee7a4d24c23 (patch)
tree0b06da4048162f72b2bb677d3a9686571f7be26d /drivers/gpu/drm/radeon/radeon_semaphore.c
parent68e250b7c281dbb75ea2a892a7d4ca27f974fc91 (diff)
downloadlinux-stericsson-220907d9835ce5181b9f782c862b1ee7a4d24c23.tar.gz
drm/radeon: rework ring syncing code
Move inter ring syncing with semaphores into the existing ring allocations, with that we need to lock the ring mutex only once. Signed-off-by: Christian König <deathsimple@vodafone.de> Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_semaphore.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_semaphore.c71
1 files changed, 25 insertions, 46 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_semaphore.c b/drivers/gpu/drm/radeon/radeon_semaphore.c
index e2ace5dce117..7cc78de6ddc3 100644
--- a/drivers/gpu/drm/radeon/radeon_semaphore.c
+++ b/drivers/gpu/drm/radeon/radeon_semaphore.c
@@ -68,70 +68,49 @@ void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
}
+/* caller must hold ring lock */
int radeon_semaphore_sync_rings(struct radeon_device *rdev,
struct radeon_semaphore *semaphore,
- bool sync_to[RADEON_NUM_RINGS],
- int dst_ring)
+ int signaler, int waiter)
{
- int i = 0, r;
+ int r;
- mutex_lock(&rdev->ring_lock);
- r = radeon_ring_alloc(rdev, &rdev->ring[dst_ring], RADEON_NUM_RINGS * 8);
- if (r) {
- goto error;
+ /* no need to signal and wait on the same ring */
+ if (signaler == waiter) {
+ return 0;
}
- for (i = 0; i < RADEON_NUM_RINGS; ++i) {
- /* no need to sync to our own or unused rings */
- if (!sync_to[i] || i == dst_ring)
- continue;
-
- /* prevent GPU deadlocks */
- if (!rdev->ring[i].ready) {
- dev_err(rdev->dev, "Trying to sync to a disabled ring!");
- r = -EINVAL;
- goto error;
- }
-
- r = radeon_ring_alloc(rdev, &rdev->ring[i], 8);
- if (r) {
- goto error;
- }
-
- radeon_semaphore_emit_signal(rdev, i, semaphore);
- radeon_semaphore_emit_wait(rdev, dst_ring, semaphore);
+ /* prevent GPU deadlocks */
+ if (!rdev->ring[signaler].ready) {
+ dev_err(rdev->dev, "Trying to sync to a disabled ring!");
+ return -EINVAL;
+ }
- radeon_ring_commit(rdev, &rdev->ring[i]);
+ r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
+ if (r) {
+ return r;
}
+ radeon_semaphore_emit_signal(rdev, signaler, semaphore);
+ radeon_ring_commit(rdev, &rdev->ring[signaler]);
- radeon_ring_commit(rdev, &rdev->ring[dst_ring]);
- mutex_unlock(&rdev->ring_lock);
+ /* we assume caller has already allocated space on waiters ring */
+ radeon_semaphore_emit_wait(rdev, waiter, semaphore);
return 0;
-
-error:
- /* unlock all locks taken so far */
- for (--i; i >= 0; --i) {
- if (sync_to[i] || i == dst_ring) {
- radeon_ring_undo(&rdev->ring[i]);
- }
- }
- radeon_ring_undo(&rdev->ring[dst_ring]);
- mutex_unlock(&rdev->ring_lock);
- return r;
}
void radeon_semaphore_free(struct radeon_device *rdev,
- struct radeon_semaphore *semaphore,
+ struct radeon_semaphore **semaphore,
struct radeon_fence *fence)
{
- if (semaphore == NULL) {
+ if (semaphore == NULL || *semaphore == NULL) {
return;
}
- if (semaphore->waiters > 0) {
+ if ((*semaphore)->waiters > 0) {
dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
- " hardware lockup imminent!\n", semaphore);
+ " hardware lockup imminent!\n", *semaphore);
}
- radeon_sa_bo_free(rdev, &semaphore->sa_bo, fence);
- kfree(semaphore);
+ radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
+ kfree(*semaphore);
+ *semaphore = NULL;
}