[PATCH 2/5] drm/xe: Add ref counting for xe_file

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

Add ref counting for xe_file.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 drivers/gpu/drm/xe/xe_device.c       |  7 +++++--
 drivers/gpu/drm/xe/xe_device.h       | 12 ++++++++++++
 drivers/gpu/drm/xe/xe_device_types.h |  3 +++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index babb697652d5..e6eacf1bcce0 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -87,11 +87,14 @@ static int xe_file_open(struct drm_device *dev, struct drm_file *file)
 	spin_unlock(&xe->clients.lock);
 
 	file->driver_priv = xef;
+	kref_init(&xef->refcount);
+
 	return 0;
 }
 
-static void xe_file_destroy(struct xe_file *xef)
+void xe_file_destroy(struct kref *ref)
 {
+	struct xe_file *xef = container_of(ref, struct xe_file, refcount);
 	struct xe_device *xe = xef->xe;
 	struct xe_vm *vm;
 	unsigned long idx;
@@ -130,7 +133,7 @@ static void xe_file_close(struct drm_device *dev, struct drm_file *file)
 		xe_exec_queue_put(q);
 	}
 
-	xe_file_destroy(xef);
+	xe_file_put(xef);
 }
 
 static const struct drm_ioctl_desc xe_ioctls[] = {
diff --git a/drivers/gpu/drm/xe/xe_device.h b/drivers/gpu/drm/xe/xe_device.h
index bb07f5669dbb..2a8b370b1fda 100644
--- a/drivers/gpu/drm/xe/xe_device.h
+++ b/drivers/gpu/drm/xe/xe_device.h
@@ -169,5 +169,17 @@ static inline bool xe_device_wedged(struct xe_device *xe)
 }
 
 void xe_device_declare_wedged(struct xe_device *xe);
+void xe_file_destroy(struct kref *ref);
+
+static inline struct xe_file *xe_file_get(struct xe_file *xef)
+{
+	kref_get(&xef->refcount);
+	return xef;
+}
+
+static inline void xe_file_put(struct xe_file *xef)
+{
+	kref_put(&xef->refcount, xe_file_destroy);
+}
 
 #endif
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index c37be471d11c..ec2b0fb6afe1 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -566,6 +566,9 @@ struct xe_file {
 
 	/** @client: drm client */
 	struct xe_drm_client *client;
+
+	/** @refcount: ref count of this xe file */
+	struct kref refcount;
 };
 
 #endif
-- 
2.38.1