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drm/amdgpu: add amdgpu_get_sdma_instance helper function 

This function is added to map the ring to sdma instance

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jammy Zhou 2015-09-01 12:56:17 +08:00 committed by Alex Deucher
parent 36f523a7c0
commit 4b2f7e2ca9
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/amd/amdgpu/amdgpu.h
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@ -2199,6 +2199,21 @@ static inline void amdgpu_ring_write(struct amdgpu_ring *ring, uint32_t v)
ring->ring_free_dw--; ring->ring_free_dw--;
} }
static inline struct amdgpu_sdma * amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
{
struct amdgpu_device *adev = ring->adev;
int i;
for (i = 0; i < AMDGPU_MAX_SDMA_INSTANCES; i++)
if (&adev->sdma[i].ring == ring)
break;
if (i < AMDGPU_MAX_SDMA_INSTANCES)
return &adev->sdma[i];
else
return NULL;
}
/* /*
* ASICs macro. * ASICs macro.
*/ */