drm/amd: abstract kernel rq and normal rq to priority of run queue

BugLink: http://bugs.launchpad.net/bugs/1546572

Allows us to set priorities in the scheduler.
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
(cherry picked from commit d033a6de)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1045,7 +1045,7 @@ struct amdgpu_ctx_mgr {
 	struct idr		ctx_handles;
 };
 
-int amdgpu_ctx_init(struct amdgpu_device *adev, bool kernel,
+int amdgpu_ctx_init(struct amdgpu_device *adev, enum amd_sched_priority pri,
 		    struct amdgpu_ctx *ctx);
 void amdgpu_ctx_fini(struct amdgpu_ctx *ctx);
 

drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c

@@ -25,7 +25,7 @@
 #include <drm/drmP.h>
 #include "amdgpu.h"
 
-int amdgpu_ctx_init(struct amdgpu_device *adev, bool kernel,
+int amdgpu_ctx_init(struct amdgpu_device *adev, enum amd_sched_priority pri,
 		    struct amdgpu_ctx *ctx)
 {
 	unsigned i, j;
@@ -42,10 +42,9 @@ int amdgpu_ctx_init(struct amdgpu_device *adev, bool kernel,
 		/* create context entity for each ring */
 		for (i = 0; i < adev->num_rings; i++) {
 			struct amd_sched_rq *rq;
-			if (kernel)
-				rq = &adev->rings[i]->sched.kernel_rq;
-			else
-				rq = &adev->rings[i]->sched.sched_rq;
+			if (pri >= AMD_SCHED_MAX_PRIORITY)
+				return -EINVAL;
+			rq = &adev->rings[i]->sched.sched_rq[pri];
 			r = amd_sched_entity_init(&adev->rings[i]->sched,
 						  &ctx->rings[i].entity,
 						  rq, amdgpu_sched_jobs);
@@ -103,7 +102,7 @@ static int amdgpu_ctx_alloc(struct amdgpu_device *adev,
 		return r;
 	}
 	*id = (uint32_t)r;
-	r = amdgpu_ctx_init(adev, false, ctx);
+	r = amdgpu_ctx_init(adev, AMD_SCHED_PRIORITY_NORMAL, ctx);
 	mutex_unlock(&mgr->lock);
 
 	return r;

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -1528,7 +1528,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 		return r;
 	}
 
-	r = amdgpu_ctx_init(adev, true, &adev->kernel_ctx);
+	r = amdgpu_ctx_init(adev, AMD_SCHED_PRIORITY_KERNEL, &adev->kernel_ctx);
 	if (r) {
 		dev_err(adev->dev, "failed to create kernel context (%d).\n", r);
 		return r;

drivers/gpu/drm/amd/scheduler/gpu_scheduler.c

@@ -349,14 +349,17 @@ static struct amd_sched_entity *
 amd_sched_select_entity(struct amd_gpu_scheduler *sched)
 {
 	struct amd_sched_entity *entity;
+	int i;
 
 	if (!amd_sched_ready(sched))
 		return NULL;
 
 	/* Kernel run queue has higher priority than normal run queue*/
-	entity = amd_sched_rq_select_entity(&sched->kernel_rq);
-	if (entity == NULL)
-		entity = amd_sched_rq_select_entity(&sched->sched_rq);
+	for (i = 0; i < AMD_SCHED_MAX_PRIORITY; i++) {
+		entity = amd_sched_rq_select_entity(&sched->sched_rq[i]);
+		if (entity)
+			break;
+	}
 
 	return entity;
 }
@@ -478,12 +481,13 @@ int amd_sched_init(struct amd_gpu_scheduler *sched,
 		   struct amd_sched_backend_ops *ops,
 		   unsigned hw_submission, long timeout, const char *name)
 {
+	int i;
 	sched->ops = ops;
 	sched->hw_submission_limit = hw_submission;
 	sched->name = name;
 	sched->timeout = timeout;
-	amd_sched_rq_init(&sched->sched_rq);
-	amd_sched_rq_init(&sched->kernel_rq);
+	for (i = 0; i < AMD_SCHED_MAX_PRIORITY; i++)
+		amd_sched_rq_init(&sched->sched_rq[i]);
 
 	init_waitqueue_head(&sched->wake_up_worker);
 	init_waitqueue_head(&sched->job_scheduled);

drivers/gpu/drm/amd/scheduler/gpu_scheduler.h

@@ -104,6 +104,12 @@ struct amd_sched_backend_ops {
 	struct fence *(*run_job)(struct amd_sched_job *sched_job);
 };
 
+enum amd_sched_priority {
+	AMD_SCHED_PRIORITY_KERNEL = 0,
+	AMD_SCHED_PRIORITY_NORMAL,
+	AMD_SCHED_MAX_PRIORITY
+};
+
 /**
  * One scheduler is implemented for each hardware ring
 */
@@ -112,8 +118,7 @@ struct amd_gpu_scheduler {
 	uint32_t			hw_submission_limit;
 	long				timeout;
 	const char			*name;
-	struct amd_sched_rq		sched_rq;
-	struct amd_sched_rq		kernel_rq;
+	struct amd_sched_rq		sched_rq[AMD_SCHED_MAX_PRIORITY];
 	wait_queue_head_t		wake_up_worker;
 	wait_queue_head_t		job_scheduled;
 	atomic_t			hw_rq_count;