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drm/amdgpu: add a helper to calculate ring distance

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Add a helper to calculate the distance in DWs between
two wptrs.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2026-01-29 14:49:13 -05:00
parent d8e4e77c4d
commit 08e7d6c3ce
1 changed files with 12 additions and 6 deletions
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18
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
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@@ -522,6 +522,17 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring,
ring->count_dw -= count_dw;
}
static inline unsigned int amdgpu_ring_get_dw_distance(struct amdgpu_ring *ring,
u64 start_wptr, u64 end_wptr)
{
unsigned int start = start_wptr & ring->buf_mask;
unsigned int end = end_wptr & ring->buf_mask;
if (end < start)
end += ring->ring_size >> 2;
return end - start;
}
/**
* amdgpu_ring_patch_cond_exec - patch dw count of conditional execute
* @ring: amdgpu_ring structure
@@ -532,18 +543,13 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring,
static inline void amdgpu_ring_patch_cond_exec(struct amdgpu_ring *ring,
unsigned int offset)
{
unsigned cur;
if (!ring->funcs->init_cond_exec)
return;
WARN_ON(offset > ring->buf_mask);
WARN_ON(ring->ring[offset] != 0);
cur = (ring->wptr - 1) & ring->buf_mask;
if (cur < offset)
cur += ring->ring_size >> 2;
ring->ring[offset] = cur - offset;
ring->ring[offset] = amdgpu_ring_get_dw_distance(ring, offset, ring->wptr - 1);
}
int amdgpu_ring_test_helper(struct amdgpu_ring *ring);