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drm/amdgpu: Make SDMA phase quantum configurable

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Set a configurable SDMA phase quantum when enabling SDMA context
switching. The default value significantly reduces SDMA latency
in page table updates when user-mode SDMA queues have concurrent
activity, compared to the initial HW setting.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Andres Rodriguez <andres.rodriguez@amd.com>
Reviewed-by: Shaoyun Liu <shaoyun.liu@amd.com>
Acked-by: Chunming Zhou <david1.zhou@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling
2016-07-15 18:37:05 -04:00
committed by Alex Deucher
parent 763dbbfa5f
commit a667386cb9
5 changed files with 100 additions and 3 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu.h
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@@ -107,6 +107,7 @@ extern unsigned amdgpu_pcie_gen_cap;
extern unsigned amdgpu_pcie_lane_cap;
extern unsigned amdgpu_cg_mask;
extern unsigned amdgpu_pg_mask;
extern unsigned amdgpu_sdma_phase_quantum;
extern char *amdgpu_disable_cu;
extern char *amdgpu_virtual_display;
extern unsigned amdgpu_pp_feature_mask;