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drm/amdgpu:implement ring_write_multiple

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Write multiple dwords to the ring.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Monk Liu 2017-01-17 10:52:33 +08:00 committed by Alex Deucher
parent ae65a26dd3
commit 0a8e147369
1 changed files with 31 additions and 0 deletions
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31
drivers/gpu/drm/amd/amdgpu/amdgpu.h
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@ -1588,6 +1588,37 @@ static inline void amdgpu_ring_write(struct amdgpu_ring *ring, uint32_t v)
ring->count_dw--;
}
static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring, void *src, int count_dw)
{
unsigned occupied, chunk1, chunk2;
void *dst;
if (ring->count_dw < count_dw) {
DRM_ERROR("amdgpu: writing more dwords to the ring than expected!\n");
} else {
occupied = ring->wptr & ring->ptr_mask;
dst = (void *)&ring->ring[occupied];
chunk1 = ring->ptr_mask + 1 - occupied;
chunk1 = (chunk1 >= count_dw) ? count_dw: chunk1;
chunk2 = count_dw - chunk1;
chunk1 <<= 2;
chunk2 <<= 2;
if (chunk1)
memcpy(dst, src, chunk1);
if (chunk2) {
src += chunk1;
dst = (void *)ring->ring;
memcpy(dst, src, chunk2);
}
ring->wptr += count_dw;
ring->wptr &= ring->ptr_mask;
ring->count_dw -= count_dw;
}
}
static inline struct amdgpu_sdma_instance *
amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
{