[PATCH 2/2] drm/amdkfd: Call kfd2kgd.set_compute_idle

[Felix Kuehling]

User mode queue submissions don't go through KFD. Therefore we don't
know exactly when compute is idle or not idle. We use the existence
of user mode queues on a device as an approximation.

register_process is called when the first queue of a process is
created. Conversely unregister_process is called when the last queue
is destroyed. The first process that is registered takes compute
out of idle. The last process that is unregisters sets compute back
to idle.

Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
Reviewed-by: Eric Huang <JinHuiEric.Huang at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 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 ace94d6..ec0d62a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -782,7 +782,8 @@ static int register_process(struct device_queue_manager *dqm,
 
 	retval = dqm->asic_ops.update_qpd(dqm, qpd);
 
-	dqm->processes_count++;
+	if (dqm->processes_count++ == 0)
+		dqm->dev->kfd2kgd->set_compute_idle(dqm->dev->kgd, false);
 
 	dqm_unlock(dqm);
 
@@ -805,7 +806,9 @@ static int unregister_process(struct device_queue_manager *dqm,
 		if (qpd == cur->qpd) {
 			list_del(&cur->list);
 			kfree(cur);
-			dqm->processes_count--;
+			if (--dqm->processes_count == 0)
+				dqm->dev->kfd2kgd->set_compute_idle(
+					dqm->dev->kgd, true);
 			goto out;
 		}
 	}
-- 
2.7.4