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 <[email protected]>
27 * Daryll Strauss <[email protected]>
28 * Gareth Hughes <[email protected]>
29 *
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 /** @file drm_fops.c
36 * Support code for dealing with the file privates associated with each
37 * open of the DRM device.
38 */
39
40 #include "dev/drm/drmP.h"
41
42 /* drm_open_helper is called whenever a process opens /dev/drm. */
drm_open_helper(struct cdev * kdev,int flags,int fmt,DRM_STRUCTPROC * p,struct drm_device * dev)43 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
44 struct drm_device *dev)
45 {
46 struct drm_file *priv;
47 int retcode;
48
49 if (flags & O_EXCL)
50 return EBUSY; /* No exclusive opens */
51 dev->flags = flags;
52
53 DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
54
55 priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
56 if (priv == NULL) {
57 return ENOMEM;
58 }
59
60 DRM_LOCK();
61 priv->dev = dev;
62 priv->uid = p->td_ucred->cr_svuid;
63 priv->pid = p->td_proc->p_pid;
64 priv->ioctl_count = 0;
65
66 /* for compatibility root is always authenticated */
67 priv->authenticated = DRM_SUSER(p);
68
69 if (dev->driver->open) {
70 /* shared code returns -errno */
71 retcode = -dev->driver->open(dev, priv);
72 if (retcode != 0) {
73 free(priv, DRM_MEM_FILES);
74 DRM_UNLOCK();
75 return retcode;
76 }
77 }
78
79 /* first opener automatically becomes master */
80 priv->master = TAILQ_EMPTY(&dev->files);
81
82 TAILQ_INSERT_TAIL(&dev->files, priv, link);
83 DRM_UNLOCK();
84 kdev->si_drv1 = dev;
85
86 retcode = devfs_set_cdevpriv(priv, drm_close);
87 if (retcode != 0)
88 drm_close(priv);
89
90 return (retcode);
91 }
92
93
94 /* The drm_read and drm_poll are stubs to prevent spurious errors
95 * on older X Servers (4.3.0 and earlier) */
96
drm_read(struct cdev * kdev,struct uio * uio,int ioflag)97 int drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
98 {
99 return 0;
100 }
101
drm_poll(struct cdev * kdev,int events,DRM_STRUCTPROC * p)102 int drm_poll(struct cdev *kdev, int events, DRM_STRUCTPROC *p)
103 {
104 return 0;
105 }
106