[PATCH 2/2] drm/amdgpu/userq: prevent runtime pm when userqs are active

[Alex Deucher]

Similar to KFD, prevent runtime pm while user queues are active.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 30 +++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 7d49a0bede1e2..4ff2e423c50cb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2705,6 +2705,29 @@ static int amdgpu_runtime_idle_check_display(struct device *dev)
 	return 0;
 }
 
+static int amdgpu_runtime_idle_check_userq(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct amdgpu_device *adev = drm_to_adev(drm_dev);
+	struct amdgpu_usermode_queue *queue;
+	struct amdgpu_userq_mgr *uqm, *tmp;
+	int queue_id;
+	int ret = 0;
+
+	mutex_lock(&adev->userq_mutex);
+	list_for_each_entry_safe(uqm, tmp, &adev->userq_mgr_list, list) {
+		idr_for_each_entry(&uqm->userq_idr, queue, queue_id) {
+			ret = -EBUSY;
+			goto done;
+		}
+	}
+done:
+	mutex_unlock(&adev->userq_mutex);
+
+	return ret;
+}
+
 static int amdgpu_pmops_runtime_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
@@ -2718,6 +2741,9 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
 	}
 
 	ret = amdgpu_runtime_idle_check_display(dev);
+	if (ret)
+		return ret;
+	ret = amdgpu_runtime_idle_check_userq(dev);
 	if (ret)
 		return ret;
 
@@ -2841,7 +2867,11 @@ static int amdgpu_pmops_runtime_idle(struct device *dev)
 	}
 
 	ret = amdgpu_runtime_idle_check_display(dev);
+	if (ret)
+		goto done;
 
+	ret = amdgpu_runtime_idle_check_userq(dev);
+done:
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_autosuspend(dev);
 	return ret;
-- 
2.49.0