1 /*
2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /* BEGIN CSTYLED */
7
8 /* drm_fops.h -- File operations for DRM -*- linux-c -*-
9 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
10 */
11 /*-
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * Copyright (c) 2009, Intel Corporation.
15 * All Rights Reserved.
16 *
17 * Permission is hereby granted, free of charge, to any person obtaining a
18 * copy of this software and associated documentation files (the "Software"),
19 * to deal in the Software without restriction, including without limitation
20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
21 * and/or sell copies of the Software, and to permit persons to whom the
22 * Software is furnished to do so, subject to the following conditions:
23 *
24 * The above copyright notice and this permission notice (including the next
25 * paragraph) shall be included in all copies or substantial portions of the
26 * Software.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
34 * OTHER DEALINGS IN THE SOFTWARE.
35 *
36 * Authors:
37 * Rickard E. (Rik) Faith <faith@valinux.com>
38 * Daryll Strauss <daryll@valinux.com>
39 * Gareth Hughes <gareth@valinux.com>
40 *
41 */
42
43 /* END CSTYLED */
44
45 #include "drmP.h"
46
47 /*ARGSUSED*/
48 drm_file_t *
49 drm_find_file_by_proc(drm_device_t *dev, cred_t *credp)
50 {
51 pid_t pid = ddi_get_pid();
52 drm_file_t *priv;
53
54 TAILQ_FOREACH(priv, &dev->files, link)
55 if (priv->pid == pid)
56 return (priv);
57 return (NULL);
58 }
59
60
61 drm_cminor_t *
62 drm_find_file_by_minor(drm_device_t *dev, int minor)
63 {
64 drm_cminor_t *mp;
65
66 TAILQ_FOREACH(mp, &dev->minordevs, link) {
67 if (mp->minor == minor)
68 return (mp);
69 }
70 return (NULL);
71 }
72
73 /* drm_open_helper is called whenever a process opens /dev/drm. */
74 /*ARGSUSED*/
75 int
76 drm_open_helper(drm_device_t *dev, drm_cminor_t *mp, int flags,
77 int otyp, cred_t *credp)
78 {
79 drm_file_t *priv;
80 pid_t pid;
81 int retcode;
82
83 if (flags & FEXCL)
84 return (EBUSY); /* No exclusive opens */
85 dev->flags = flags;
86
87 pid = ddi_get_pid();
88 DRM_DEBUG("drm_open_helper :pid = %d", pid);
89
90 DRM_LOCK();
91 priv = drm_find_file_by_proc(dev, credp);
92 if (priv) {
93 priv->refs++;
94 } else {
95 priv = drm_alloc(sizeof (*priv), DRM_MEM_FILES);
96 if (priv == NULL) {
97 DRM_UNLOCK();
98 return (ENOMEM);
99 }
100 bzero(priv, sizeof (*priv));
101
102 priv->uid = crgetsuid(credp);
103 priv->pid = pid;
104
105 priv->refs = 1;
106 priv->minor = 5; /* just for hack */
107 priv->ioctl_count = 0;
108
109 /* for compatibility root is always authenticated */
110 priv->authenticated = DRM_SUSER(credp);
111
112 if (dev->driver->use_gem == 1)
113 drm_gem_open(priv);
114
115 if (dev->driver->open) {
116 retcode = dev->driver->open(dev, priv);
117 if (retcode != 0) {
118 drm_free(priv, sizeof (*priv), DRM_MEM_FILES);
119 DRM_UNLOCK();
120 return (retcode);
121 }
122 }
123
124 /* first opener automatically becomes master */
125 priv->master = TAILQ_EMPTY(&dev->files);
126 TAILQ_INSERT_TAIL(&dev->files, priv, link);
127 }
128 mp->fpriv = priv;
129 DRM_UNLOCK();
130 return (0);
131 }