[RFC PATCH 3/4] drm/amdgpu: change hw sched list on ctx priority override

[Nirmoy Das]

Switch to appropriate sched list for an entity on priority override.

Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 54 ++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index a1742b1d4f9c..69a791430b25 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -508,11 +508,53 @@ struct dma_fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,
 	return fence;
 }
 
+static int amdgpu_ctx_change_sched(struct amdgpu_ctx *ctx,
+				   struct amdgpu_ctx_entity *aentity,
+				   int hw_ip, enum drm_sched_priority priority)
+{
+	struct amdgpu_device *adev = ctx->adev;
+	struct drm_gpu_scheduler **scheds = NULL;
+	unsigned num_scheds = 0;
+
+	switch (hw_ip) {
+		case AMDGPU_HW_IP_COMPUTE:
+			if (priority > DRM_SCHED_PRIORITY_NORMAL &&
+			    adev->gfx.num_compute_sched_high) {
+				scheds = adev->gfx.compute_sched_high;
+				num_scheds = adev->gfx.num_compute_sched_high;
+			} else {
+				scheds = adev->gfx.compute_sched;
+				num_scheds = adev->gfx.num_compute_sched;
+			}
+			break;
+		default:
+			return 0;
+	}
+
+	return drm_sched_entity_modify_sched(&aentity->entity, scheds, num_scheds);
+}
+
+static int amdgpu_ctx_hw_priority_override(struct amdgpu_ctx *ctx,
+					    const u32 hw_ip,
+					    enum drm_sched_priority priority)
+{
+	int r = 0, i;
+
+	for (i = 0; i < amdgpu_ctx_num_entities[hw_ip]; ++i) {
+		if (!ctx->entities[hw_ip][i])
+			continue;
+		r = amdgpu_ctx_change_sched(ctx, ctx->entities[hw_ip][i],
+					    hw_ip, priority);
+	}
+
+	return r;
+}
+
 void amdgpu_ctx_priority_override(struct amdgpu_ctx *ctx,
 				  enum drm_sched_priority priority)
 {
 	enum drm_sched_priority ctx_prio;
-	unsigned i, j;
+	unsigned r, i, j;
 
 	ctx->override_priority = priority;
 
@@ -521,11 +563,21 @@ void amdgpu_ctx_priority_override(struct amdgpu_ctx *ctx,
 	for (i = 0; i < AMDGPU_HW_IP_NUM; ++i) {
 		for (j = 0; j < amdgpu_ctx_num_entities[i]; ++j) {
 			struct drm_sched_entity *entity;
+			struct amdgpu_ring *ring;
 
 			if (!ctx->entities[i][j])
 				continue;
 
 			entity = &ctx->entities[i][j]->entity;
+			ring = to_amdgpu_ring(entity->rq->sched);
+
+			if (ring->high_priority) {
+				r = amdgpu_ctx_hw_priority_override(ctx, i,
+								    ctx_prio);
+				if (r)
+					DRM_ERROR("Failed to override HW priority for %s",
+						  ring->name);
+			}
 			drm_sched_entity_set_priority(entity, ctx_prio);
 		}
 	}
-- 
2.25.0