From 0a8e147369d558287e46b21a12b15e883abc2075 Mon Sep 17 00:00:00 2001 From: Monk Liu Date: Tue, 17 Jan 2017 10:52:33 +0800 Subject: [PATCH] drm/amdgpu:implement ring_write_multiple MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Write multiple dwords to the ring. Signed-off-by: Monk Liu Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 31 +++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 953148058bdb..b0d9ae3b9893 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -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) { -- 2.20.1