drm/amdgpu: new queue policy, take first 2 queues of each pipe v2

Instead of taking the first pipe and giving the rest to kfd, take the
first 2 queues of each pipe.

Effectively, amdgpu and amdkfd own the same number of queues. But
because the queues are spread over multiple pipes the hardware will be
able to better handle concurrent compute workloads.

amdgpu goes from 1 pipe to 4 pipes, i.e. from 1 compute threads to 4
amdkfd goes from 3 pipe to 4 pipes, i.e. from 3 compute threads to 4

v2: fix policy comment

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
index 7e1db63..dde85f1 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
@@ -2838,8 +2838,8 @@ static void gfx_v7_0_compute_queue_acquire(struct amdgpu_device *adev)
                if (mec >= adev->gfx.mec.num_mec)
                        break;
 
-               /* policy: amdgpu owns all queues in the first pipe */
-               if (mec == 0 && pipe == 0)
+               /* policy: amdgpu owns the first two queues of the first MEC */
+               if (mec == 0 && queue < 2)
                        set_bit(i, adev->gfx.mec.queue_bitmap);
        }
 

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 0a7ee4d..328549e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -1464,8 +1464,8 @@ static void gfx_v8_0_compute_queue_acquire(struct amdgpu_device *adev)
                if (mec >= adev->gfx.mec.num_mec)
                        break;
 
-               /* policy: amdgpu owns all queues in the first pipe */
-               if (mec == 0 && pipe == 0)
+               /* policy: amdgpu owns the first two queues of the first MEC */
+               if (mec == 0 && queue < 2)
                        set_bit(i, adev->gfx.mec.queue_bitmap);
        }