drm/mode: move framebuffer reference into object.

This is the initial code to add references to some mode objects.
In the future we need to start reference counting connectors so
firstly I want to reorganise the code so the framebuffer ref counting
uses the same paths.

This patch shouldn't change any functionality, just moves the kref.

[airlied: move kerneldoc as well]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 158bdca..8cee833 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -275,7 +275,8 @@ EXPORT_SYMBOL(drm_get_format_name);
 static int drm_mode_object_get_reg(struct drm_device *dev,
                                   struct drm_mode_object *obj,
                                   uint32_t obj_type,
-                                  bool register_obj)
+                                  bool register_obj,
+                                  void (*obj_free_cb)(struct kref *kref))
 {
        int ret;
 
@@ -288,6 +289,10 @@ static int drm_mode_object_get_reg(struct drm_device *dev,
                 */
                obj->id = ret;
                obj->type = obj_type;
+               if (obj_free_cb) {
+                       obj->free_cb = obj_free_cb;
+                       kref_init(&obj->refcount);
+               }
        }
        mutex_unlock(&dev->mode_config.idr_mutex);
 
@@ -311,7 +316,7 @@ static int drm_mode_object_get_reg(struct drm_device *dev,
 int drm_mode_object_get(struct drm_device *dev,
                        struct drm_mode_object *obj, uint32_t obj_type)
 {
-       return drm_mode_object_get_reg(dev, obj, obj_type, true);
+       return drm_mode_object_get_reg(dev, obj, obj_type, true, NULL);
 }
 
 static void drm_mode_object_register(struct drm_device *dev,
@@ -389,10 +394,35 @@ struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_mode_object_find);
 
+void drm_mode_object_unreference(struct drm_mode_object *obj)
+{
+       if (obj->free_cb) {
+               DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
+               kref_put(&obj->refcount, obj->free_cb);
+       }
+}
+EXPORT_SYMBOL(drm_mode_object_unreference);
+
+/**
+ * drm_mode_object_reference - incr the fb refcnt
+ * @obj: mode_object
+ *
+ * This function operates only on refcounted objects.
+ * This functions increments the object's refcount.
+ */
+void drm_mode_object_reference(struct drm_mode_object *obj)
+{
+       if (obj->free_cb) {
+               DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
+               kref_get(&obj->refcount);
+       }
+}
+EXPORT_SYMBOL(drm_mode_object_reference);
+
 static void drm_framebuffer_free(struct kref *kref)
 {
        struct drm_framebuffer *fb =
-                       container_of(kref, struct drm_framebuffer, refcount);
+                       container_of(kref, struct drm_framebuffer, base.refcount);
        struct drm_device *dev = fb->dev;
 
        /*
@@ -430,12 +460,12 @@ int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
        int ret;
 
        mutex_lock(&dev->mode_config.fb_lock);
-       kref_init(&fb->refcount);
        INIT_LIST_HEAD(&fb->filp_head);
        fb->dev = dev;
        fb->funcs = funcs;
 
-       ret = drm_mode_object_get(dev, &fb->base, DRM_MODE_OBJECT_FB);
+       ret = drm_mode_object_get_reg(dev, &fb->base, DRM_MODE_OBJECT_FB,
+                                     true, drm_framebuffer_free);
        if (ret)
                goto out;
 
@@ -482,7 +512,7 @@ struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
        mutex_lock(&dev->mode_config.fb_lock);
        fb = __drm_framebuffer_lookup(dev, id);
        if (fb) {
-               if (!kref_get_unless_zero(&fb->refcount))
+               if (!kref_get_unless_zero(&fb->base.refcount))
                        fb = NULL;
        }
        mutex_unlock(&dev->mode_config.fb_lock);
@@ -492,32 +522,6 @@ struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
 EXPORT_SYMBOL(drm_framebuffer_lookup);
 
 /**
- * drm_framebuffer_unreference - unref a framebuffer
- * @fb: framebuffer to unref
- *
- * This functions decrements the fb's refcount and frees it if it drops to zero.
- */
-void drm_framebuffer_unreference(struct drm_framebuffer *fb)
-{
-       DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
-       kref_put(&fb->refcount, drm_framebuffer_free);
-}
-EXPORT_SYMBOL(drm_framebuffer_unreference);
-
-/**
- * drm_framebuffer_reference - incr the fb refcnt
- * @fb: framebuffer
- *
- * This functions increments the fb's refcount.
- */
-void drm_framebuffer_reference(struct drm_framebuffer *fb)
-{
-       DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
-       kref_get(&fb->refcount);
-}
-EXPORT_SYMBOL(drm_framebuffer_reference);
-
-/**
  * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
  * @fb: fb to unregister
  *
@@ -902,7 +906,7 @@ int drm_connector_init(struct drm_device *dev,
 
        drm_modeset_lock_all(dev);
 
-       ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false);
+       ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false, NULL);
        if (ret)
                goto out_unlock;
 
@@ -5971,7 +5975,7 @@ void drm_mode_config_cleanup(struct drm_device *dev)
         */
        WARN_ON(!list_empty(&dev->mode_config.fb_list));
        list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
-               drm_framebuffer_free(&fb->refcount);
+               drm_framebuffer_free(&fb->base.refcount);
        }
 
        ida_destroy(&dev->mode_config.connector_ida);

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 1c99ee0..43c3149 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -49,6 +49,8 @@ struct drm_mode_object {
        uint32_t id;
        uint32_t type;
        struct drm_object_properties *properties;
+       struct kref refcount;
+       void (*free_cb)(struct kref *kref);
 };
 
 #define DRM_OBJECT_MAX_PROPERTY 24
@@ -223,8 +225,8 @@ struct drm_framebuffer {
         * should be deferred.  In cases like this, the driver would like to
         * hold a ref to the fb even though it has already been removed from
         * userspace perspective.
+        * The refcount is stored inside the mode object.
         */
-       struct kref refcount;
        /*
         * Place on the dev->mode_config.fb_list, access protected by
         * dev->mode_config.fb_lock.
@@ -2377,8 +2379,6 @@ extern int drm_framebuffer_init(struct drm_device *dev,
                                const struct drm_framebuffer_funcs *funcs);
 extern struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
                                                      uint32_t id);
-extern void drm_framebuffer_unreference(struct drm_framebuffer *fb);
-extern void drm_framebuffer_reference(struct drm_framebuffer *fb);
 extern void drm_framebuffer_remove(struct drm_framebuffer *fb);
 extern void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
 extern void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);
@@ -2436,6 +2436,8 @@ extern int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
                                         int gamma_size);
 extern struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
                uint32_t id, uint32_t type);
+void drm_mode_object_reference(struct drm_mode_object *obj);
+void drm_mode_object_unreference(struct drm_mode_object *obj);
 
 /* IOCTLs */
 extern int drm_mode_getresources(struct drm_device *dev,
@@ -2605,6 +2607,28 @@ static inline uint32_t drm_color_lut_extract(uint32_t user_input,
        return clamp_val(val, 0, max);
 }
 
+/*
+ * drm_framebuffer_reference - incr the fb refcnt
+ * @fb: framebuffer
+ *
+ * This functions increments the fb's refcount.
+ */
+static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
+{
+       drm_mode_object_reference(&fb->base);
+}
+
+/**
+ * drm_framebuffer_unreference - unref a framebuffer
+ * @fb: framebuffer to unref
+ *
+ * This functions decrements the fb's refcount and frees it if it drops to zero.
+ */
+static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
+{
+       drm_mode_object_unreference(&fb->base);
+}
+
 /**
  * drm_framebuffer_read_refcount - read the framebuffer reference count.
  * @fb: framebuffer
@@ -2613,7 +2637,7 @@ static inline uint32_t drm_color_lut_extract(uint32_t user_input,
  */
 static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb)
 {
-       return atomic_read(&fb->refcount.refcount);
+       return atomic_read(&fb->base.refcount.refcount);
 }
 
 /* Plane list iterator for legacy (overlay only) planes. */