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drm/amdgpu: implement ring set_priority for gfx_v8 compute v9

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Programming CP_HQD_QUEUE_PRIORITY enables a queue to take priority over
other queues on the same pipe. Multiple queues on a pipe are timesliced
so this gives us full precedence over other queues.

Programming CP_HQD_PIPE_PRIORITY changes the SPI_ARB_PRIORITY of the
wave as follows:
        0x2: CS_H
        0x1: CS_M
        0x0: CS_L

The SPI block will then dispatch work according to the policy set by
SPI_ARB_PRIORITY. In the current policy CS_H is higher priority than
gfx.

In order to prevent getting stuck in loops of resources bouncing between
GFX and high priority compute and introducing further latency, we
statically reserve a portion of the pipe.

v2: fix srbm_select to ring->queue and use ring->funcs->type
v3: use AMD_SCHED_PRIORITY_* instead of AMDGPU_CTX_PRIORITY_*
v4: switch int to enum amd_sched_priority
v5: corresponding changes for srbm_lock
v6: change CU reservation to PIPE_PERCENT allocation
v7: use kiq instead of MMIO
v8: back to MMIO, and make the implementation sleep safe.
v9: corresponding changes for splitting HIGH into _HW/_SW

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>
This commit is contained in:
Andres Rodriguez
2017-04-28 20:05:51 -04:00
committed by Alex Deucher
parent b2ff0e8ac4
commit b8866c26ec
3 changed files with 105 additions and 0 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu.h
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@@ -1035,6 +1035,10 @@ struct amdgpu_gfx {
bool in_suspend;
/* NGG */
struct amdgpu_ngg ngg;
/* pipe reservation */
struct mutex pipe_reserve_mutex;
DECLARE_BITMAP (pipe_reserve_bitmap, AMDGPU_MAX_COMPUTE_QUEUES);
};
int amdgpu_ib_get(struct amdgpu_device *adev, struct amdgpu_vm *vm,