diff options
| author | Monk Liu <monk.liu@amd.com> | 2016-01-14 19:07:38 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2016-05-02 15:11:09 -0400 |
| commit | 03ccf481980f8d3363263e73c64473d8f2779dc0 (patch) | |
| tree | df0cad433591814429cc700ad4a013d51bdaec53 /drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | |
| parent | 128cff1af68689cf4d85d3ba948c86a194dee30f (diff) | |
drm/amdgpu: patch cond exec for SDMA
More ground work for conditional execution on SDMA
necessary for preemption.
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c index 8c8ca98dd129..833d2658428f 100644 --- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c @@ -452,6 +452,31 @@ static void sdma_v3_0_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 se amdgpu_ring_write(ring, SDMA_PKT_TRAP_INT_CONTEXT_INT_CONTEXT(0)); } +unsigned init_cond_exec(struct amdgpu_ring *ring) +{ + unsigned ret; + amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_COND_EXE)); + amdgpu_ring_write(ring, lower_32_bits(ring->cond_exe_gpu_addr)); + amdgpu_ring_write(ring, upper_32_bits(ring->cond_exe_gpu_addr)); + amdgpu_ring_write(ring, 1); + ret = ring->wptr;/* this is the offset we need patch later */ + amdgpu_ring_write(ring, 0x55aa55aa);/* insert dummy here and patch it later */ + return ret; +} + +void patch_cond_exec(struct amdgpu_ring *ring, unsigned offset) +{ + unsigned cur; + BUG_ON(ring->ring[offset] != 0x55aa55aa); + + cur = ring->wptr - 1; + if (likely(cur > offset)) + ring->ring[offset] = cur - offset; + else + ring->ring[offset] = (ring->ring_size>>2) - offset + cur; +} + + /** * sdma_v3_0_gfx_stop - stop the gfx async dma engines * |