drm/amdkfd: Add PM4 target XCC

In a device that supports multiple XCCs, unlike AQL queues, the PM4 queue
will be only processed in one XCC in the partitioning. This patch
re-purposes the queue percentage variable in create queue and update
queue ioctl for the user space to specify the target XCC.
Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Tested-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -186,7 +186,12 @@ static int kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
 static int set_queue_properties_from_user(struct queue_properties *q_properties,
 				struct kfd_ioctl_create_queue_args *args)
 {
-	if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
+	/*
+	 * Repurpose queue percentage to accommodate new features:
+	 * bit 0-7: queue percentage
+	 * bit 8-15: pm4_target_xcc
+	 */
+	if ((args->queue_percentage & 0xFF) > KFD_MAX_QUEUE_PERCENTAGE) {
 		pr_err("Queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 		return -EINVAL;
 	}
@@ -236,7 +241,9 @@ static int set_queue_properties_from_user(struct queue_properties *q_properties,
 
 	q_properties->is_interop = false;
 	q_properties->is_gws = false;
-	q_properties->queue_percent = args->queue_percentage;
+	q_properties->queue_percent = args->queue_percentage & 0xFF;
+	/* bit 8-15 are repurposed to be PM4 target XCC */
+	q_properties->pm4_target_xcc = (args->queue_percentage >> 8) & 0xFF;
 	q_properties->priority = args->queue_priority;
 	q_properties->queue_address = args->ring_base_address;
 	q_properties->queue_size = args->ring_size;
@@ -442,7 +449,12 @@ static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 	struct kfd_ioctl_update_queue_args *args = data;
 	struct queue_properties properties;
 
-	if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
+	/*
+	 * Repurpose queue percentage to accommodate new features:
+	 * bit 0-7: queue percentage
+	 * bit 8-15: pm4_target_xcc
+	 */
+	if ((args->queue_percentage & 0xFF) > KFD_MAX_QUEUE_PERCENTAGE) {
 		pr_err("Queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
 		return -EINVAL;
 	}
@@ -466,7 +478,9 @@ static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
 
 	properties.queue_address = args->ring_base_address;
 	properties.queue_size = args->ring_size;
-	properties.queue_percent = args->queue_percentage;
+	properties.queue_percent = args->queue_percentage & 0xFF;
+	/* bit 8-15 are repurposed to be PM4 target XCC */
+	properties.pm4_target_xcc = (args->queue_percentage >> 8) & 0xFF;
 	properties.priority = args->queue_priority;
 
 	pr_debug("Updating queue id %d for pasid 0x%x\n",

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c

@@ -587,6 +587,7 @@ static void init_mqd_v9_4_3(struct mqd_manager *mm, void **mqd,
 			/* PM4 Queue */
 			m->compute_current_logic_xcc_id = 0;
 			m->compute_tg_chunk_size = 0;
+			m->pm4_target_xcc_in_xcp = q->pm4_target_xcc;
 		}
 
 		if (xcc == 0) {
@@ -627,6 +628,7 @@ static void update_mqd_v9_4_3(struct mqd_manager *mm, void *mqd,
 			/* PM4 Queue */
 			m->compute_current_logic_xcc_id = 0;
 			m->compute_tg_chunk_size = 0;
+			m->pm4_target_xcc_in_xcp = q->pm4_target_xcc;
 		}
 	}
 }

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

@@ -509,6 +509,7 @@ struct queue_properties {
 	bool is_evicted;
 	bool is_active;
 	bool is_gws;
+	uint32_t pm4_target_xcc;
 	/* Not relevant for user mode queues in cp scheduling */
 	unsigned int vmid;
 	/* Relevant only for sdma queues*/

drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c

@@ -477,6 +477,7 @@ int pqm_update_queue_properties(struct process_queue_manager *pqm,
 	pqn->q->properties.queue_size = p->queue_size;
 	pqn->q->properties.queue_percent = p->queue_percent;
 	pqn->q->properties.priority = p->priority;
+	pqn->q->properties.pm4_target_xcc = p->pm4_target_xcc;
 
 	retval = pqn->q->device->dqm->ops.update_queue(pqn->q->device->dqm,
 							pqn->q, NULL);