drm/amdgpu: add plumbing for ctx priority changes v2

Introduce amdgpu_ctx_priority_override(). A mechanism to override a
context's priority.

An override can be terminated by setting the override to
AMD_SCHED_PRIORITY_UNSET.

v2: change refcounted interface for a direct set

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 34 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 715ce4863bc8..951c8db01412 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -735,7 +735,9 @@ struct amdgpu_ctx {
         spinlock_t              ring_lock;
         struct dma_fence        **fences;
         struct amdgpu_ctx_ring  rings[AMDGPU_MAX_RINGS];
-        bool preamble_presented;
+        bool                    preamble_presented;
+        enum amd_sched_priority init_priority;
+        enum amd_sched_priority override_priority;
 };
 
 struct amdgpu_ctx_mgr {
@@ -752,6 +754,8 @@ int amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx, struct amdgpu_ring *ring,
                               struct dma_fence *fence, uint64_t *seq);
 struct dma_fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,
                                    struct amdgpu_ring *ring, uint64_t seq);
+void amdgpu_ctx_priority_override(struct amdgpu_ctx *ctx,
+                                  enum amd_sched_priority priority);
 
 int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
                      struct drm_file *filp);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 29eebdc30a4c..d2ef24f4b56d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -72,6 +72,8 @@ static int amdgpu_ctx_init(struct amdgpu_device *adev,
         }
 
         ctx->reset_counter = atomic_read(&adev->gpu_reset_counter);
+        ctx->init_priority = priority;
+        ctx->override_priority = AMD_SCHED_PRIORITY_UNSET;
 
         /* create context entity for each ring */
         for (i = 0; i < adev->num_rings; i++) {
@@ -362,6 +364,33 @@ struct dma_fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,
         return fence;
 }
 
+void amdgpu_ctx_priority_override(struct amdgpu_ctx *ctx,
+                                  enum amd_sched_priority priority)
+{
+        int i;
+        struct amdgpu_device *adev = ctx->adev;
+        struct amd_sched_rq *rq;
+        struct amd_sched_entity *entity;
+        struct amdgpu_ring *ring;
+        enum amd_sched_priority ctx_prio;
+
+        ctx->override_priority = priority;
+
+        ctx_prio = (ctx->override_priority == AMD_SCHED_PRIORITY_UNSET) ?
+                        ctx->init_priority : ctx->override_priority;
+
+        for (i = 0; i < adev->num_rings; i++) {
+                ring = adev->rings[i];
+                entity = &ctx->rings[i].entity;
+                rq = &ring->sched.sched_rq[ctx_prio];
+
+                if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
+                        continue;
+
+                amd_sched_entity_set_rq(entity, rq);
+        }
+}
+
 void amdgpu_ctx_mgr_init(struct amdgpu_ctx_mgr *mgr)
 {
         mutex_init(&mgr->lock);