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*/
48drm_file_t *
49drm_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
61drm_cminor_t *
62drm_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*/
75int
76drm_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}
132