[PATCH 3/9] drm/amdkfd: Fix MQD updates

[Felix Kuehling]

When a queue is mapped, the MQD is owned by the FW. The FW overwrites
the MQD on the next unmap operation. Therefore the queue must be
unmapped before updating the MQD.

For the non-HWS case, also fix disabling of queues and creation of
queues in disabled state.

Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 .../gpu/drm/amd/amdkfd/kfd_device_queue_manager.c  | 84 ++++++++++++++++------
 1 file changed, 62 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index be925a4..dccb493 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -49,6 +49,8 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 				enum kfd_unmap_queues_filter filter,
 				uint32_t filter_param);
 
+static int map_queues_cpsch(struct device_queue_manager *dqm);
+
 static int create_sdma_queue_nocpsch(struct device_queue_manager *dqm,
 					struct queue *q,
 					struct qcm_process_device *qpd);
@@ -274,6 +276,9 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
 	dqm->dev->kfd2kgd->set_scratch_backing_va(
 			dqm->dev->kgd, qpd->sh_hidden_private_base, qpd->vmid);
 
+	if (!q->properties.is_active)
+		return 0;
+
 	retval = mqd->load_mqd(mqd, q->mqd, q->pipe, q->queue, &q->properties,
 			       q->process->mm);
 	if (retval)
@@ -365,23 +370,50 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 		goto out_unlock;
 	}
 
-	if (q->properties.is_active)
-		prev_active = true;
+	/* Save previous activity state for counters */
+	prev_active = q->properties.is_active;
+
+	/* Make sure the queue is unmapped before updating the MQD */
+	if (sched_policy != KFD_SCHED_POLICY_NO_HWS) {
+		retval = unmap_queues_cpsch(dqm,
+				KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
+		if (retval != 0) {
+			pr_err("unmap queue failed\n");
+			goto out_unlock;
+		}
+	} else if (sched_policy == KFD_SCHED_POLICY_NO_HWS &&
+		   prev_active &&
+		   (q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
+		    q->properties.type == KFD_QUEUE_TYPE_SDMA)) {
+		retval = mqd->destroy_mqd(mqd, q->mqd,
+				KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
+				KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
+		if (retval) {
+			pr_err("destroy mqd failed\n");
+			goto out_unlock;
+		}
+	}
+
+	retval = mqd->update_mqd(mqd, q->mqd, &q->properties);
+
+	if (sched_policy != KFD_SCHED_POLICY_NO_HWS)
+		retval = map_queues_cpsch(dqm);
+	else if (sched_policy == KFD_SCHED_POLICY_NO_HWS &&
+		 q->properties.is_active &&
+		 (q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
+		  q->properties.type == KFD_QUEUE_TYPE_SDMA))
+		retval = mqd->load_mqd(mqd, q->mqd, q->pipe, q->queue,
+				       &q->properties, q->process->mm);
 
 	/*
-	 *
 	 * check active state vs. the previous state
 	 * and modify counter accordingly
 	 */
-	retval = mqd->update_mqd(mqd, q->mqd, &q->properties);
-	if ((q->properties.is_active) && (!prev_active))
+	if (q->properties.is_active && !prev_active)
 		dqm->queue_count++;
 	else if (!q->properties.is_active && prev_active)
 		dqm->queue_count--;
 
-	if (sched_policy != KFD_SCHED_POLICY_NO_HWS)
-		retval = execute_queues_cpsch(dqm);
-
 out_unlock:
 	mutex_unlock(&dqm->lock);
 	return retval;
@@ -863,6 +895,27 @@ static int unmap_sdma_queues(struct device_queue_manager *dqm,
 }
 
 /* dqm->lock mutex has to be locked before calling this function */
+static int map_queues_cpsch(struct device_queue_manager *dqm)
+{
+	int retval;
+
+	if (dqm->queue_count <= 0 || dqm->processes_count <= 0)
+		return 0;
+
+	if (dqm->active_runlist)
+		return 0;
+
+	retval = pm_send_runlist(&dqm->packets, &dqm->queues);
+	if (retval) {
+		pr_err("failed to execute runlist\n");
+		return retval;
+	}
+	dqm->active_runlist = true;
+
+	return retval;
+}
+
+/* dqm->lock mutex has to be locked before calling this function */
 static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 				enum kfd_unmap_queues_filter filter,
 				uint32_t filter_param)
@@ -918,20 +971,7 @@ static int execute_queues_cpsch(struct device_queue_manager *dqm)
 		return retval;
 	}
 
-	if (dqm->queue_count <= 0 || dqm->processes_count <= 0)
-		return 0;
-
-	if (dqm->active_runlist)
-		return 0;
-
-	retval = pm_send_runlist(&dqm->packets, &dqm->queues);
-	if (retval) {
-		pr_err("failed to execute runlist");
-		return retval;
-	}
-	dqm->active_runlist = true;
-
-	return retval;
+	return map_queues_cpsch(dqm);
 }
 
 static int destroy_queue_cpsch(struct device_queue_manager *dqm,
-- 
2.7.4