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drm/amdgpu/fence: add helper to extract the guilty fence

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Add a helper to extract the first amdgpu_fence which has
not yet signalled and is thus guilty or at least collateral
damage.

Reviewed-by: Jesse Zhang <jesse.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2026-05-12 10:23:02 -04:00
parent ce3f23a780
commit 36ed61b1c0
2 changed files with 33 additions and 0 deletions
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31
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
View File

@@ -831,6 +831,37 @@ void amdgpu_ring_backup_unprocessed_commands(struct amdgpu_ring *ring,
} while (last_seq != seq);
}
struct amdgpu_fence *
amdgpu_ring_find_guilty_fence(struct amdgpu_ring *ring)
{
struct dma_fence *unprocessed;
struct dma_fence __rcu **ptr;
struct amdgpu_fence *fence;
u32 seq, last_seq;
last_seq = amdgpu_fence_read(ring) & ring->fence_drv.num_fences_mask;
seq = ring->fence_drv.sync_seq & ring->fence_drv.num_fences_mask;
ring->ring_backup_entries_to_copy = 0;
do {
last_seq++;
last_seq &= ring->fence_drv.num_fences_mask;
ptr = &ring->fence_drv.fences[last_seq];
rcu_read_lock();
unprocessed = rcu_dereference(*ptr);
if (unprocessed && !dma_fence_is_signaled(unprocessed)) {
fence = container_of(unprocessed, struct amdgpu_fence, base);
rcu_read_unlock();
return fence;
}
rcu_read_unlock();
} while (last_seq != seq);
return NULL;
}
/*
* Common fence implementation
*/

2
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
View File

@@ -589,6 +589,8 @@ int amdgpu_ib_ring_tests(struct amdgpu_device *adev);
bool amdgpu_ring_sched_ready(struct amdgpu_ring *ring);
void amdgpu_ring_backup_unprocessed_commands(struct amdgpu_ring *ring,
struct amdgpu_fence *guilty_fence);
struct amdgpu_fence *
amdgpu_ring_find_guilty_fence(struct amdgpu_ring *ring);
void amdgpu_ring_reset_helper_begin(struct amdgpu_ring *ring,
struct amdgpu_fence *guilty_fence);
int amdgpu_ring_reset_helper_end(struct amdgpu_ring *ring,