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drm/radeon: fix CP semaphores on CIK

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The CP semaphore queue on CIK has a bug that triggers if uncompleted
waits use the same address while a signal is still pending. Work around
this by using different addresses for each sync.

Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2014-02-18 11:37:20 +01:00
committed by Alex Deucher
parent ebc54ffe1c
commit 8f53492f86
3 changed files with 20 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/drm/radeon/radeon_semaphore.c
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@@ -34,14 +34,15 @@
int radeon_semaphore_create(struct radeon_device *rdev,
struct radeon_semaphore **semaphore)
{
uint32_t *cpu_addr;
int i, r;
*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
if (*semaphore == NULL) {
return -ENOMEM;
}
r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
&(*semaphore)->sa_bo, 8, 8, true);
r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, &(*semaphore)->sa_bo,
8 * RADEON_NUM_SYNCS, 8, true);
if (r) {
kfree(*semaphore);
*semaphore = NULL;
@@ -49,7 +50,10 @@ int radeon_semaphore_create(struct radeon_device *rdev,
}
(*semaphore)->waiters = 0;
(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
*((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
cpu_addr = radeon_sa_bo_cpu_addr((*semaphore)->sa_bo);
for (i = 0; i < RADEON_NUM_SYNCS; ++i)
cpu_addr[i] = 0;
for (i = 0; i < RADEON_NUM_RINGS; ++i)
(*semaphore)->sync_to[i] = NULL;
@@ -125,6 +129,7 @@ int radeon_semaphore_sync_rings(struct radeon_device *rdev,
struct radeon_semaphore *semaphore,
int ring)
{
unsigned count = 0;
int i, r;
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
@@ -140,6 +145,12 @@ int radeon_semaphore_sync_rings(struct radeon_device *rdev,
return -EINVAL;
}
if (++count > RADEON_NUM_SYNCS) {
/* not enough room, wait manually */
radeon_fence_wait_locked(fence);
continue;
}
/* allocate enough space for sync command */
r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
if (r) {
@@ -164,6 +175,8 @@ int radeon_semaphore_sync_rings(struct radeon_device *rdev,
radeon_ring_commit(rdev, &rdev->ring[i]);
radeon_fence_note_sync(fence, ring);
semaphore->gpu_addr += 8;
}
return 0;