linux-imx

/*

 * Copyright (c) 2016 Intel Corporation

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting documentation, and

 * that the name of the copyright holders not be used in advertising or

 * publicity pertaining to distribution of the software without specific,

 * written prior permission.  The copyright holders make no representations

 * about the suitability of this software for any purpose.  It is provided "as

 * is" without express or implied warranty.

 *

 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR

 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

 * OF THIS SOFTWARE.

 */

​

#include <linux/export.h>

#include <drm/drmP.h>

#include <drm/drm_mode_object.h>

#include <drm/drm_atomic.h>

​

#include "drm_crtc_internal.h"

​

/*

 * Internal function to assign a slot in the object idr and optionally

 * register the object into the idr.

 */

int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj,

              uint32_t obj_type, bool register_obj,

              void (*obj_free_cb)(struct kref *kref))

{

    int ret;

​

    mutex_lock(&dev->mode_config.idr_mutex);

    ret = idr_alloc(&dev->mode_config.object_idr, register_obj ? obj : NULL,

            1, 0, GFP_KERNEL);

    if (ret >= 0) {

        /*

         * Set up the object linking under the protection of the idr

         * lock so that other users can't see inconsistent state.

         */

        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);

​

    return ret < 0 ? ret : 0;

}

​

/**

 * drm_mode_object_add - allocate a new modeset identifier

 * @dev: DRM device

 * @obj: object pointer, used to generate unique ID