drm/amdgpu: set compute queue priority at mqd_init

We were changing compute ring priority while rings were being used
before every job submission which is not recommended. This patch
sets compute queue priority at mqd initialization for gfx8, gfx9 and
gfx10.

Policy: make queue 0 of each pipe as high priority compute queue

High/normal priority compute sched lists are generated from set of high/normal
priority compute queues. At context creation, entity of compute queue
get a sched list from high or normal priority depending on ctx->priority

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1205,7 +1205,6 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
 	struct amdgpu_fpriv *fpriv = p->filp->driver_priv;
 	struct drm_sched_entity *entity = p->entity;
 	enum drm_sched_priority priority;
-	struct amdgpu_ring *ring;
 	struct amdgpu_bo_list_entry *e;
 	struct amdgpu_job *job;
 	uint64_t seq;
@@ -1258,9 +1257,6 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
 	priority = job->base.s_priority;
 	drm_sched_entity_push_job(&job->base, entity);
 
-	ring = to_amdgpu_ring(entity->rq->sched);
-	amdgpu_ring_priority_get(ring, priority);
-
 	amdgpu_vm_move_to_lru_tail(p->adev, &fpriv->vm);
 
 	ttm_eu_fence_buffer_objects(&p->ticket, &p->validated, p->fence);

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

@@ -61,12 +61,24 @@ static int amdgpu_ctx_priority_permit(struct drm_file *filp,
 	return -EACCES;
 }
 
+static enum gfx_pipe_priority amdgpu_ctx_sched_prio_to_compute_prio(enum drm_sched_priority prio)
+{
+	switch (prio) {
+	case DRM_SCHED_PRIORITY_HIGH_HW:
+	case DRM_SCHED_PRIORITY_KERNEL:
+		return AMDGPU_GFX_PIPE_PRIO_HIGH;
+	default:
+		return AMDGPU_GFX_PIPE_PRIO_NORMAL;
+	}
+}
+
 static int amdgpu_ctx_init_entity(struct amdgpu_ctx *ctx, const u32 hw_ip, const u32 ring)
 {
 	struct amdgpu_device *adev = ctx->adev;
 	struct amdgpu_ctx_entity *entity;
 	struct drm_gpu_scheduler **scheds = NULL, *sched = NULL;
 	unsigned num_scheds = 0;
+	enum gfx_pipe_priority hw_prio;
 	enum drm_sched_priority priority;
 	int r;
 
@@ -85,8 +97,9 @@ static int amdgpu_ctx_init_entity(struct amdgpu_ctx *ctx, const u32 hw_ip, const
 			num_scheds = 1;
 			break;
 		case AMDGPU_HW_IP_COMPUTE:
-			scheds = adev->gfx.compute_sched;
+			hw_prio = amdgpu_ctx_sched_prio_to_compute_prio(priority);
-			num_scheds = adev->gfx.num_compute_sched;
+			scheds = adev->gfx.compute_prio_sched[hw_prio];
+			num_scheds = adev->gfx.num_compute_sched[hw_prio];
 			break;
 		case AMDGPU_HW_IP_DMA:
 			scheds = adev->sdma.sdma_sched;
@@ -628,20 +641,46 @@ void amdgpu_ctx_mgr_fini(struct amdgpu_ctx_mgr *mgr)
 	mutex_destroy(&mgr->lock);
 }
 
+
+static void amdgpu_ctx_init_compute_sched(struct amdgpu_device *adev)
+{
+	int num_compute_sched_normal = 0;
+	int num_compute_sched_high = AMDGPU_MAX_COMPUTE_RINGS - 1;
+	int i;
+
+	/* use one drm sched array, gfx.compute_sched to store both high and
+	 * normal priority drm compute schedulers */
+	for (i = 0; i < adev->gfx.num_compute_rings; i++) {
+		if (!adev->gfx.compute_ring[i].has_high_prio)
+			adev->gfx.compute_sched[num_compute_sched_normal++] =
+				&adev->gfx.compute_ring[i].sched;
+		else
+			adev->gfx.compute_sched[num_compute_sched_high--] =
+				&adev->gfx.compute_ring[i].sched;
+	}
+
+	/* compute ring only has two priority for now */
+	i = AMDGPU_GFX_PIPE_PRIO_NORMAL;
+	adev->gfx.compute_prio_sched[i] = &adev->gfx.compute_sched[0];
+	adev->gfx.num_compute_sched[i] = num_compute_sched_normal;
+
+	i = AMDGPU_GFX_PIPE_PRIO_HIGH;
+	adev->gfx.compute_prio_sched[i] =
+		&adev->gfx.compute_sched[num_compute_sched_high - 1];
+	adev->gfx.num_compute_sched[i] =
+		adev->gfx.num_compute_rings - num_compute_sched_normal;
+}
+
 void amdgpu_ctx_init_sched(struct amdgpu_device *adev)
 {
 	int i, j;
 
+	amdgpu_ctx_init_compute_sched(adev);
 	for (i = 0; i < adev->gfx.num_gfx_rings; i++) {
 		adev->gfx.gfx_sched[i] = &adev->gfx.gfx_ring[i].sched;
 		adev->gfx.num_gfx_sched++;
 	}
 
-	for (i = 0; i < adev->gfx.num_compute_rings; i++) {
-		adev->gfx.compute_sched[i] = &adev->gfx.compute_ring[i].sched;
-		adev->gfx.num_compute_sched++;
-	}
-
 	for (i = 0; i < adev->sdma.num_instances; i++) {
 		adev->sdma.sdma_sched[i] = &adev->sdma.instance[i].ring.sched;
 		adev->sdma.num_sdma_sched++;

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

@@ -192,6 +192,14 @@ static bool amdgpu_gfx_is_multipipe_capable(struct amdgpu_device *adev)
 	return adev->gfx.mec.num_mec > 1;
 }
 
+bool amdgpu_gfx_is_high_priority_compute_queue(struct amdgpu_device *adev,
+					       int queue)
+{
+	/* Policy: make queue 0 of each pipe as high priority compute queue */
+	return (queue == 0);
+
+}
+
 void amdgpu_gfx_compute_queue_acquire(struct amdgpu_device *adev)
 {
 	int i, queue, pipe, mec;

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

@@ -41,6 +41,15 @@
 #define AMDGPU_MAX_GFX_QUEUES KGD_MAX_QUEUES
 #define AMDGPU_MAX_COMPUTE_QUEUES KGD_MAX_QUEUES
 
+enum gfx_pipe_priority {
+	AMDGPU_GFX_PIPE_PRIO_NORMAL = 1,
+	AMDGPU_GFX_PIPE_PRIO_HIGH,
+	AMDGPU_GFX_PIPE_PRIO_MAX
+};
+
+#define AMDGPU_GFX_QUEUE_PRIORITY_MINIMUM  0
+#define AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM  15
+
 struct amdgpu_mec {
 	struct amdgpu_bo	*hpd_eop_obj;
 	u64			hpd_eop_gpu_addr;
@@ -281,8 +290,9 @@ struct amdgpu_gfx {
 	uint32_t			num_gfx_sched;
 	unsigned			num_gfx_rings;
 	struct amdgpu_ring		compute_ring[AMDGPU_MAX_COMPUTE_RINGS];
+	struct drm_gpu_scheduler        **compute_prio_sched[AMDGPU_GFX_PIPE_PRIO_MAX];
 	struct drm_gpu_scheduler	*compute_sched[AMDGPU_MAX_COMPUTE_RINGS];
-	uint32_t			num_compute_sched;
+	uint32_t                        num_compute_sched[AMDGPU_GFX_PIPE_PRIO_MAX];
 	unsigned			num_compute_rings;
 	struct amdgpu_irq_src		eop_irq;
 	struct amdgpu_irq_src		priv_reg_irq;
@@ -364,6 +374,8 @@ void amdgpu_gfx_bit_to_mec_queue(struct amdgpu_device *adev, int bit,
 				 int *mec, int *pipe, int *queue);
 bool amdgpu_gfx_is_mec_queue_enabled(struct amdgpu_device *adev, int mec,
 				     int pipe, int queue);
+bool amdgpu_gfx_is_high_priority_compute_queue(struct amdgpu_device *adev,
+					       int queue);
 int amdgpu_gfx_me_queue_to_bit(struct amdgpu_device *adev, int me,
 			       int pipe, int queue);
 void amdgpu_gfx_bit_to_me_queue(struct amdgpu_device *adev, int bit,

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

@@ -117,12 +117,10 @@ void amdgpu_job_free_resources(struct amdgpu_job *job)
 
 static void amdgpu_job_free_cb(struct drm_sched_job *s_job)
 {
-	struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched);
 	struct amdgpu_job *job = to_amdgpu_job(s_job);
 
 	drm_sched_job_cleanup(s_job);
 
-	amdgpu_ring_priority_put(ring, s_job->s_priority);
 	dma_fence_put(job->fence);
 	amdgpu_sync_free(&job->sync);
 	amdgpu_sync_free(&job->sched_sync);
@@ -143,7 +141,6 @@ int amdgpu_job_submit(struct amdgpu_job *job, struct drm_sched_entity *entity,
 		      void *owner, struct dma_fence **f)
 {
 	enum drm_sched_priority priority;
-	struct amdgpu_ring *ring;
 	int r;
 
 	if (!f)
@@ -158,9 +155,6 @@ int amdgpu_job_submit(struct amdgpu_job *job, struct drm_sched_entity *entity,
 	priority = job->base.s_priority;
 	drm_sched_entity_push_job(&job->base, entity);
 
-	ring = to_amdgpu_ring(entity->rq->sched);
-	amdgpu_ring_priority_get(ring, priority);
-
 	return 0;
 }
 

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

@@ -222,6 +222,7 @@ struct amdgpu_ring {
 	struct mutex		priority_mutex;
 	/* protected by priority_mutex */
 	int			priority;
+	bool			has_high_prio;
 
 #if defined(CONFIG_DEBUG_FS)
 	struct dentry *ent;

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -3213,6 +3213,22 @@ done:
 	return r;
 }
 
+static void gfx_v10_0_compute_mqd_set_priority(struct amdgpu_ring *ring, struct v10_compute_mqd *mqd)
+{
+	struct amdgpu_device *adev = ring->adev;
+
+	if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
+		if (amdgpu_gfx_is_high_priority_compute_queue(adev, ring->queue)) {
+			mqd->cp_hqd_pipe_priority = AMDGPU_GFX_PIPE_PRIO_HIGH;
+			ring->has_high_prio = true;
+			mqd->cp_hqd_queue_priority =
+				AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
+		} else {
+			ring->has_high_prio = false;
+		}
+	}
+}
+
 static int gfx_v10_0_compute_mqd_init(struct amdgpu_ring *ring)
 {
 	struct amdgpu_device *adev = ring->adev;
@@ -3338,6 +3354,9 @@ static int gfx_v10_0_compute_mqd_init(struct amdgpu_ring *ring)
 	tmp = REG_SET_FIELD(tmp, CP_HQD_IB_CONTROL, MIN_IB_AVAIL_SIZE, 3);
 	mqd->cp_hqd_ib_control = tmp;
 
+	/* set static priority for a compute queue/ring */
+	gfx_v10_0_compute_mqd_set_priority(ring, mqd);
+
 	/* map_queues packet doesn't need activate the queue,
 	 * so only kiq need set this field.
 	 */

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -4430,6 +4430,22 @@ static int gfx_v8_0_deactivate_hqd(struct amdgpu_device *adev, u32 req)
 	return r;
 }
 
+static void gfx_v8_0_mqd_set_priority(struct amdgpu_ring *ring, struct vi_mqd *mqd)
+{
+	struct amdgpu_device *adev = ring->adev;
+
+	if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
+		if (amdgpu_gfx_is_high_priority_compute_queue(adev, ring->queue)) {
+			mqd->cp_hqd_pipe_priority = AMDGPU_GFX_PIPE_PRIO_HIGH;
+			ring->has_high_prio = true;
+			mqd->cp_hqd_queue_priority =
+				AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
+		} else {
+			ring->has_high_prio = false;
+		}
+	}
+}
+
 static int gfx_v8_0_mqd_init(struct amdgpu_ring *ring)
 {
 	struct amdgpu_device *adev = ring->adev;
@@ -4553,9 +4569,6 @@ static int gfx_v8_0_mqd_init(struct amdgpu_ring *ring)
 	/* defaults */
 	mqd->cp_hqd_eop_rptr = RREG32(mmCP_HQD_EOP_RPTR);
 	mqd->cp_hqd_eop_wptr = RREG32(mmCP_HQD_EOP_WPTR);
-	mqd->cp_hqd_pipe_priority = RREG32(mmCP_HQD_PIPE_PRIORITY);
-	mqd->cp_hqd_queue_priority = RREG32(mmCP_HQD_QUEUE_PRIORITY);
-	mqd->cp_hqd_quantum = RREG32(mmCP_HQD_QUANTUM);
 	mqd->cp_hqd_ctx_save_base_addr_lo = RREG32(mmCP_HQD_CTX_SAVE_BASE_ADDR_LO);
 	mqd->cp_hqd_ctx_save_base_addr_hi = RREG32(mmCP_HQD_CTX_SAVE_BASE_ADDR_HI);
 	mqd->cp_hqd_cntl_stack_offset = RREG32(mmCP_HQD_CNTL_STACK_OFFSET);
@@ -4567,6 +4580,10 @@ static int gfx_v8_0_mqd_init(struct amdgpu_ring *ring)
 	mqd->cp_hqd_eop_wptr_mem = RREG32(mmCP_HQD_EOP_WPTR_MEM);
 	mqd->cp_hqd_eop_dones = RREG32(mmCP_HQD_EOP_DONES);
 
+	/* set static priority for a queue/ring */
+	gfx_v8_0_mqd_set_priority(ring, mqd);
+	mqd->cp_hqd_quantum = RREG32(mmCP_HQD_QUANTUM);
+
 	/* map_queues packet doesn't need activate the queue,
 	 * so only kiq need set this field.
 	 */

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -3316,6 +3316,22 @@ static void gfx_v9_0_kiq_setting(struct amdgpu_ring *ring)
 	WREG32_SOC15_RLC(GC, 0, mmRLC_CP_SCHEDULERS, tmp);
 }
 
+static void gfx_v9_0_mqd_set_priority(struct amdgpu_ring *ring, struct v9_mqd *mqd)
+{
+	struct amdgpu_device *adev = ring->adev;
+
+	if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
+		if (amdgpu_gfx_is_high_priority_compute_queue(adev, ring->queue)) {
+			mqd->cp_hqd_pipe_priority = AMDGPU_GFX_PIPE_PRIO_HIGH;
+			ring->has_high_prio = true;
+			mqd->cp_hqd_queue_priority =
+				AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
+		} else {
+			ring->has_high_prio = false;
+		}
+	}
+}
+
 static int gfx_v9_0_mqd_init(struct amdgpu_ring *ring)
 {
 	struct amdgpu_device *adev = ring->adev;
@@ -3452,6 +3468,10 @@ static int gfx_v9_0_mqd_init(struct amdgpu_ring *ring)
 	tmp = REG_SET_FIELD(tmp, CP_HQD_IB_CONTROL, MIN_IB_AVAIL_SIZE, 3);
 	mqd->cp_hqd_ib_control = tmp;
 
+	/* set static priority for a queue/ring */
+	gfx_v9_0_mqd_set_priority(ring, mqd);
+	mqd->cp_hqd_quantum = RREG32(mmCP_HQD_QUANTUM);
+
 	/* map_queues packet doesn't need activate the queue,
 	 * so only kiq need set this field.
 	 */