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drm/radeon: avoid deadlock if GPU lockup is detected in ib_pool_get

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If GPU lockup is detected in ib_pool get we are holding the ib_pool
mutex that will be needed by the GPU reset code. As ib_pool code is
safe to be reentrant from GPU reset code we should not block if we
are trying to get the ib pool lock on the behalf of the same userspace
caller, thus use the radeon_mutex_lock helper.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jerome Glisse
2012-01-23 11:52:15 -05:00
committed by Dave Airlie
parent d54fbd49ef
commit 9fc04b503d
3 changed files with 54 additions and 54 deletions
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22
drivers/gpu/drm/radeon/radeon_ring.c
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@@ -109,12 +109,12 @@ int radeon_ib_get(struct radeon_device *rdev, int ring,
return r;
}
mutex_lock(&rdev->ib_pool.mutex);
radeon_mutex_lock(&rdev->ib_pool.mutex);
idx = rdev->ib_pool.head_id;
retry:
if (cretry > 5) {
dev_err(rdev->dev, "failed to get an ib after 5 retry\n");
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
radeon_fence_unref(&fence);
return -ENOMEM;
}
@@ -139,7 +139,7 @@ retry:
*/
rdev->ib_pool.head_id = (1 + idx);
rdev->ib_pool.head_id &= (RADEON_IB_POOL_SIZE - 1);
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
return 0;
}
}
@@ -158,7 +158,7 @@ retry:
}
idx = (idx + 1) & (RADEON_IB_POOL_SIZE - 1);
}
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
radeon_fence_unref(&fence);
return r;
}
@@ -171,12 +171,12 @@ void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib)
if (tmp == NULL) {
return;
}
mutex_lock(&rdev->ib_pool.mutex);
radeon_mutex_lock(&rdev->ib_pool.mutex);
if (tmp->fence && !tmp->fence->emitted) {
radeon_sa_bo_free(rdev, &tmp->sa_bo);
radeon_fence_unref(&tmp->fence);
}
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
}
int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
@@ -214,9 +214,9 @@ int radeon_ib_pool_init(struct radeon_device *rdev)
return r;
}
mutex_lock(&rdev->ib_pool.mutex);
radeon_mutex_lock(&rdev->ib_pool.mutex);
if (rdev->ib_pool.ready) {
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
radeon_sa_bo_manager_fini(rdev, &tmp);
return 0;
}
@@ -239,7 +239,7 @@ int radeon_ib_pool_init(struct radeon_device *rdev)
if (radeon_debugfs_ring_init(rdev)) {
DRM_ERROR("Failed to register debugfs file for rings !\n");
}
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
return 0;
}
@@ -247,7 +247,7 @@ void radeon_ib_pool_fini(struct radeon_device *rdev)
{
unsigned i;
mutex_lock(&rdev->ib_pool.mutex);
radeon_mutex_lock(&rdev->ib_pool.mutex);
if (rdev->ib_pool.ready) {
for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
radeon_sa_bo_free(rdev, &rdev->ib_pool.ibs[i].sa_bo);
@@ -256,7 +256,7 @@ void radeon_ib_pool_fini(struct radeon_device *rdev)
radeon_sa_bo_manager_fini(rdev, &rdev->ib_pool.sa_manager);
rdev->ib_pool.ready = false;
}
mutex_unlock(&rdev->ib_pool.mutex);
radeon_mutex_unlock(&rdev->ib_pool.mutex);
}
int radeon_ib_pool_start(struct radeon_device *rdev)