1 /*-
2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 *
25 * Authors:
26 * Rickard E. (Rik) Faith <faith@valinux.com>
27 * Daryll Strauss <daryll@valinux.com>
28 * Gareth Hughes <gareth@valinux.com>
29 *
30 */
32 /** @file drm_fops.c
33 * Support code for dealing with the file privates associated with each
34 * open of the DRM device.
35 */
37 #include "drmP.h"
39 /* drm_open_helper is called whenever a process opens /dev/drm. */
40 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
41 struct drm_device *dev)
42 {
43 struct drm_file *priv;
44 int m = dev2unit(kdev);
45 int retcode;
47 if (flags & O_EXCL)
48 return EBUSY; /* No exclusive opens */
49 dev->flags = flags;
51 DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m);
53 priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
54 if (priv == NULL) {
55 return ENOMEM;
56 }
58 retcode = devfs_set_cdevpriv(priv, drm_close);
59 if (retcode != 0) {
60 free(priv, DRM_MEM_FILES);
61 return retcode;
62 }
64 DRM_LOCK();
65 priv->dev = dev;
66 priv->uid = p->td_ucred->cr_svuid;
67 priv->pid = p->td_proc->p_pid;
68 priv->minor = m;
69 priv->ioctl_count = 0;
71 /* for compatibility root is always authenticated */
72 priv->authenticated = DRM_SUSER(p);
74 if (dev->driver->open) {
75 /* shared code returns -errno */
76 retcode = -dev->driver->open(dev, priv);
77 if (retcode != 0) {
78 devfs_clear_cdevpriv();
79 free(priv, DRM_MEM_FILES);
80 DRM_UNLOCK();
81 return retcode;
82 }
83 }
85 /* first opener automatically becomes master */
86 priv->master = TAILQ_EMPTY(&dev->files);
88 TAILQ_INSERT_TAIL(&dev->files, priv, link);
89 DRM_UNLOCK();
90 kdev->si_drv1 = dev;
91 return 0;
92 }
95 /* The drm_read and drm_poll are stubs to prevent spurious errors
96 * on older X Servers (4.3.0 and earlier) */
98 int drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
99 {
100 return 0;
101 }
103 int drm_poll(struct cdev *kdev, int events, DRM_STRUCTPROC *p)
104 {
105 return 0;
106 }