[1/5] drm/i915: Add ability for tracking buffer objects per client

Commit Message

Tvrtko Ursulin June 12, 2023, 10:46 a.m. UTC

From: Tvrtko Ursulin <[e-mail]>

In order to show per client memory usage lets add some infrastructure
which enables tracking buffer objects owned by clients.

We add a per client list protected by a new per client lock and to support
delayed destruction (post client exit) we make tracked objects hold
references to the owning client.

Signed-off-by: Tvrtko Ursulin <[e-mail]>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.c    |  5 +++
 .../gpu/drm/i915/gem/i915_gem_object_types.h  | 12 +++++++
 drivers/gpu/drm/i915/i915_drm_client.c        | 36 ++++++++++++++++++-
 drivers/gpu/drm/i915/i915_drm_client.h        | 34 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_gem.c               |  2 +-
 5 files changed, 86 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 97ac6fb37958..d6961f6818f1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -105,6 +105,10 @@  void i915_gem_object_init(struct drm_i915_gem_object *obj,
 
 	INIT_LIST_HEAD(&obj->mm.link);
 
+#ifdef CONFIG_PROC_FS
+	INIT_LIST_HEAD(&obj->client_link);
+#endif
+
 	INIT_LIST_HEAD(&obj->lut_list);
 	spin_lock_init(&obj->lut_lock);
 
@@ -410,6 +414,7 @@  static void __i915_gem_free_objects(struct drm_i915_private *i915,
 		}
 
 		__i915_gem_object_pages_fini(obj);
+		i915_drm_client_remove_object(obj);
 		__i915_gem_free_object(obj);
 
 		/* But keep the pointer alive for RCU-protected lookups */
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index e72c57716bee..8de2b91b3edf 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -300,6 +300,18 @@  struct drm_i915_gem_object {
 	 */
 	struct i915_address_space *shares_resv_from;
 
+#ifdef CONFIG_PROC_FS
+	/**
+	 * @client: @i915_drm_client which created the object
+	 */
+	struct i915_drm_client *client;
+
+	/**
+	 * @client_link: Link into @i915_drm_client.objects_list
+	 */
+	struct list_head client_link;
+#endif
+
 	union {
 		struct rcu_head rcu;
 		struct llist_node freed;
diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
index 2a44b3876cb5..3c8d6a46a801 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.c
+++ b/drivers/gpu/drm/i915/i915_drm_client.c
@@ -17,7 +17,8 @@ 
 #include "i915_gem.h"
 #include "i915_utils.h"
 
-struct i915_drm_client *i915_drm_client_alloc(void)
+struct i915_drm_client *
+i915_drm_client_alloc(struct drm_i915_file_private *fpriv)
 {
 	struct i915_drm_client *client;
 
@@ -28,6 +29,12 @@  struct i915_drm_client *i915_drm_client_alloc(void)
 	kref_init(&client->kref);
 	spin_lock_init(&client->ctx_lock);
 	INIT_LIST_HEAD(&client->ctx_list);
+#ifdef CONFIG_PROC_FS
+	spin_lock_init(&client->objects_lock);
+	INIT_LIST_HEAD(&client->objects_list);
+
+	client->fpriv = fpriv;
+#endif
 
 	return client;
 }
@@ -108,4 +115,31 @@  void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file)
 	for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
 		show_client_class(p, i915, file_priv->client, i);
 }
+
+void i915_drm_client_add_object(struct i915_drm_client *client,
+				struct drm_i915_gem_object *obj)
+{
+	GEM_WARN_ON(obj->client);
+	GEM_WARN_ON(!list_empty(&obj->client_link));
+
+	spin_lock(&client->objects_lock);
+	obj->client = i915_drm_client_get(client);
+	list_add_tail(&obj->client_link, &client->objects_list);
+	spin_unlock(&client->objects_lock);
+}
+
+void i915_drm_client_remove_object(struct drm_i915_gem_object *obj)
+{
+	struct i915_drm_client *client = fetch_and_zero(&obj->client);
+
+	/* Object may not be associated with a client. */
+	if (!client || list_empty(&obj->client_link))
+		return;
+
+	spin_lock(&client->objects_lock);
+	list_del(&obj->client_link);
+	spin_unlock(&client->objects_lock);
+
+	i915_drm_client_put(client);
+}
 #endif
diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
index 4c18b99e10a4..5fc897ab1a6b 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.h
+++ b/drivers/gpu/drm/i915/i915_drm_client.h
@@ -12,6 +12,9 @@ 
 
 #include <uapi/drm/i915_drm.h>
 
+#include "i915_file_private.h"
+#include "gem/i915_gem_object_types.h"
+
 #define I915_LAST_UABI_ENGINE_CLASS I915_ENGINE_CLASS_COMPUTE
 
 struct drm_file;
@@ -25,6 +28,22 @@  struct i915_drm_client {
 	spinlock_t ctx_lock; /* For add/remove from ctx_list. */
 	struct list_head ctx_list; /* List of contexts belonging to client. */
 
+#ifdef CONFIG_PROC_FS
+	struct drm_i915_file_private *fpriv;
+
+	/**
+	 * @objects_lock: lock protecting @objects_list
+	 */
+	spinlock_t objects_lock;
+
+	/**
+	 * @objects_list: list of objects created by this client
+	 *
+	 * Protected by @objects_lock.
+	 */
+	struct list_head objects_list;
+#endif
+
 	/**
 	 * @past_runtime: Accumulation of pphwsp runtimes from closed contexts.
 	 */
@@ -45,10 +64,23 @@  static inline void i915_drm_client_put(struct i915_drm_client *client)
 	kref_put(&client->kref, __i915_drm_client_free);
 }
 
-struct i915_drm_client *i915_drm_client_alloc(void);
+struct i915_drm_client *i915_drm_client_alloc(struct drm_i915_file_private *fpriv);
 
 #ifdef CONFIG_PROC_FS
 void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file);
+
+void i915_drm_client_add_object(struct i915_drm_client *client,
+				struct drm_i915_gem_object *obj);
+void i915_drm_client_remove_object(struct drm_i915_gem_object *obj);
+#else
+static inline void i915_drm_client_add_object(struct i915_drm_client *client,
+					      struct drm_i915_gem_object *obj)
+{
+}
+
+static inline void i915_drm_client_remove_object(struct drm_i915_gem_object *obj)
+{
+}
 #endif
 
 #endif /* !__I915_DRM_CLIENT_H__ */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1f65bb33dd21..7ae42f746cc2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1325,7 +1325,7 @@  int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
 	if (!file_priv)
 		goto err_alloc;
 
-	client = i915_drm_client_alloc();
+	client = i915_drm_client_alloc(file_priv);
 	if (!client)
 		goto err_client;