Commit d0f37cf6 authored by Dave Airlie's avatar Dave Airlie
Browse files

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: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 747a598f

drivers/gpu/drm/drm_crtc.c

+38 −34
Original line number Diff line number Diff line
@@ -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);
@@ -491,32 +521,6 @@ 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);

include/drm/drm_crtc.h

+28 −4
Original line number Diff line number Diff line
@@ -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. */

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