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 *
8 * Author Rickard E. (Rik) Faith <faith@valinux.com>
9 * Author Gareth Hughes <gareth@valinux.com>
10 *
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
31#include <drm/drmP.h>
32#include "drm_internal.h"
33
34/**
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
39 *
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.
43 *
44 * Returns: 0 on success, negative error code on failure.
45 */
46int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
47{
48	struct drm_auth *auth = data;
49	int ret = 0;
50
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;
57	}
58	auth->magic = file_priv->magic;
59	mutex_unlock(&dev->struct_mutex);
60
61	DRM_DEBUG("%u\n", auth->magic);
62
63	return ret < 0 ? ret : 0;
64}
65
66/**
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
71 *
72 * This looks up a DRM client by the passed magic and authenticates it.
73 *
74 * Returns: 0 on success, negative error code on failure.
75 */
76int drm_authmagic(struct drm_device *dev, void *data,
77		  struct drm_file *file_priv)
78{
79	struct drm_auth *auth = data;
80	struct drm_file *file;
81
82	DRM_DEBUG("%u\n", auth->magic);
83
84	mutex_lock(&dev->struct_mutex);
85	file = idr_find(&file_priv->master->magic_map, auth->magic);
86	if (file) {
87		file->authenticated = 1;
88		idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
89	}
90	mutex_unlock(&dev->struct_mutex);
91
92	return file ? 0 : -EINVAL;
93}
94