[linux-2.6-block.git] / drivers / gpu / drm / drm_auth.c

/*
 * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Author Rickard E. (Rik) Faith <faith@valinux.com>
 * Author Gareth Hughes <gareth@valinux.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <drm/drmP.h>
#include "drm_internal.h"

/**
 * drm_getmagic - Get unique magic of a client
 * @dev: DRM device to operate on
 * @data: ioctl data containing the drm_auth object
 * @file_priv: DRM file that performs the operation
 *
 * This looks up the unique magic of the passed client and returns it. If the
 * client did not have a magic assigned, yet, a new one is registered. The magic
 * is stored in the passed drm_auth object.
 *
 * Returns: 0 on success, negative error code on failure.
 */
int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	struct drm_auth *auth = data;
	int ret = 0;

	mutex_lock(&dev->struct_mutex);
	if (!file_priv->magic) {
		ret = idr_alloc(&file_priv->master->magic_map, file_priv,
				1, 0, GFP_KERNEL);
		if (ret >= 0)
			file_priv->magic = ret;
	}
	auth->magic = file_priv->magic;
	mutex_unlock(&dev->struct_mutex);

	DRM_DEBUG("%u\n", auth->magic);

	return ret < 0 ? ret : 0;
}

/**
 * drm_authmagic - Authenticate client with a magic
 * @dev: DRM device to operate on
 * @data: ioctl data containing the drm_auth object
 * @file_priv: DRM file that performs the operation
 *
 * This looks up a DRM client by the passed magic and authenticates it.
 *
 * Returns: 0 on success, negative error code on failure.
 */
int drm_authmagic(struct drm_device *dev, void *data,
		  struct drm_file *file_priv)
{
	struct drm_auth *auth = data;
	struct drm_file *file;

	DRM_DEBUG("%u\n", auth->magic);

	mutex_lock(&dev->struct_mutex);
	file = idr_find(&file_priv->master->magic_map, auth->magic);
	if (file) {
		file->authenticated = 1;
		idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
	}
	mutex_unlock(&dev->struct_mutex);

	return file ? 0 : -EINVAL;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
	3	*
	4	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	5	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	6	* All Rights Reserved.
	7	*
32e7b94a DH	8	* Author Rickard E. (Rik) Faith <faith@valinux.com>
	9	* Author Gareth Hughes <gareth@valinux.com>
	10	*
1da177e4 LT	11	* Permission is hereby granted, free of charge, to any person obtaining a
	12	* copy of this software and associated documentation files (the "Software"),
	13	* to deal in the Software without restriction, including without limitation
	14	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	15	* and/or sell copies of the Software, and to permit persons to whom the
	16	* Software is furnished to do so, subject to the following conditions:
	17	*
	18	* The above copyright notice and this permission notice (including the next
	19	* paragraph) shall be included in all copies or substantial portions of the
	20	* Software.
	21	*
	22	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	23	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	24	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	25	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	26	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	27	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	28	* OTHER DEALINGS IN THE SOFTWARE.
	29	*/
	30
760285e7	31	#include <drm/drmP.h>
67d0ec4e	32	#include "drm_internal.h"
1da177e4	33
1da177e4	34	/**
32e7b94a DH	35	* drm_getmagic - Get unique magic of a client
	36	* @dev: DRM device to operate on
	37	* @data: ioctl data containing the drm_auth object
	38	* @file_priv: DRM file that performs the operation
1da177e4	39	*
32e7b94a DH	40	* This looks up the unique magic of the passed client and returns it. If the
	41	* client did not have a magic assigned, yet, a new one is registered. The magic
	42	* is stored in the passed drm_auth object.
1da177e4	43	*
32e7b94a	44	* Returns: 0 on success, negative error code on failure.
1da177e4	45	*/
c153f45f	46	int drm_getmagic(struct drm_device dev, void data, struct drm_file *file_priv)
1da177e4	47	{
c153f45f	48	struct drm_auth *auth = data;
32e7b94a	49	int ret = 0;
1da177e4	50
32e7b94a DH	51	mutex_lock(&dev->struct_mutex);
	52	if (!file_priv->magic) {
	53	ret = idr_alloc(&file_priv->master->magic_map, file_priv,
	54	1, 0, GFP_KERNEL);
	55	if (ret >= 0)
	56	file_priv->magic = ret;
1da177e4	57	}
32e7b94a DH	58	auth->magic = file_priv->magic;
32e7b94a DH	59	mutex_unlock(&dev->struct_mutex);
1da177e4	60
c153f45f EA	61	DRM_DEBUG("%u\n", auth->magic);
c153f45f EA	62
32e7b94a	63	return ret < 0 ? ret : 0;
1da177e4 LT	64	}
	65
	66	/**
32e7b94a DH	67	* drm_authmagic - Authenticate client with a magic
	68	* @dev: DRM device to operate on
	69	* @data: ioctl data containing the drm_auth object
	70	* @file_priv: DRM file that performs the operation
1da177e4	71	*
32e7b94a	72	* This looks up a DRM client by the passed magic and authenticates it.
1da177e4	73	*
32e7b94a	74	* Returns: 0 on success, negative error code on failure.
1da177e4	75	*/
c153f45f EA	76	int drm_authmagic(struct drm_device dev, void data,
c153f45f EA	77	struct drm_file *file_priv)
1da177e4	78	{
c153f45f	79	struct drm_auth *auth = data;
84b1fd10	80	struct drm_file *file;
1da177e4	81
c153f45f	82	DRM_DEBUG("%u\n", auth->magic);
32e7b94a DH	83
	84	mutex_lock(&dev->struct_mutex);
	85	file = idr_find(&file_priv->master->magic_map, auth->magic);
	86	if (file) {
1da177e4	87	file->authenticated = 1;
32e7b94a	88	idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
1da177e4	89	}
32e7b94a DH	90	mutex_unlock(&dev->struct_mutex);
	91
	92	return file ? 0 : -EINVAL;
1da177e4	93	}