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 */ 46 int 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(&dev->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 */ 76 int 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(&dev->magic_map, auth->magic); 86 if (file) { 87 file->authenticated = 1; 88 idr_replace(&dev->magic_map, NULL, auth->magic); 89 } 90 mutex_unlock(&dev->struct_mutex); 91 92 return file ? 0 : -EINVAL; 93 } 94