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      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 (at) valinux.com>
     27  *    Daryll Strauss <daryll (at) valinux.com>
     28  *    Gareth Hughes <gareth (at) valinux.com>
     29  *
     30  */
     31 
     32 /** @file drm_fops.c
     33  * Support code for dealing with the file privates associated with each
     34  * open of the DRM device.
     35  */
     36 
     37 #include "drmP.h"
     38 
     39 #if defined(__NetBSD__)
     40 struct drm_file *
     41 drm_find_file_by_proc(struct drm_device *dev, struct proc *p)
     42 {
     43 	uid_t uid = kauth_cred_getsvuid(p->p_cred);
     44 	pid_t pid = p->p_pid;
     45 	struct drm_file *priv;
     46 
     47 	DRM_SPINLOCK_ASSERT(&dev->dev_lock);
     48 
     49 	TAILQ_FOREACH(priv, &dev->files, link) {
     50 		if (priv->pid == pid && priv->uid == uid)
     51 			return priv;
     52 	}
     53 
     54 	return NULL;
     55 }
     56 
     57 /* drm_open_helper is called whenever a process opens /dev/drm. */
     58 int drm_open_helper(dev_t kdev, int flags, int fmt, struct proc *p,
     59 		    struct drm_device *dev)
     60 {
     61 	int	     m = minor(kdev);
     62 	struct drm_file   *priv;
     63 	int retcode;
     64 
     65 	if (flags & O_EXCL)
     66 		return EBUSY; /* No exclusive opens */
     67 	dev->flags = flags;
     68 
     69 	DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m);
     70 
     71 	DRM_LOCK();
     72 	priv = drm_find_file_by_proc(dev, p);
     73 	if (!priv) {
     74 		priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
     75 		if (priv == NULL) {
     76 			DRM_UNLOCK();
     77 			return ENOMEM;
     78 		}
     79 		priv->uid		= kauth_cred_getsvuid(p->p_cred);
     80 		priv->pid		= p->p_pid;
     81 
     82 		priv->minor		= m;
     83 		priv->ioctl_count 	= 0;
     84 
     85 		/* for compatibility root is always authenticated */
     86 		priv->authenticated	= DRM_SUSER(p);
     87 
     88 		if (dev->driver->open) {
     89 			/* shared code returns -errno */
     90 			retcode = -dev->driver->open(dev, priv);
     91 			if (retcode != 0) {
     92 				free(priv, DRM_MEM_FILES);
     93 				DRM_UNLOCK();
     94 				return retcode;
     95 			}
     96 		}
     97 
     98 		/* first opener automatically becomes master */
     99 		priv->master = TAILQ_EMPTY(&dev->files);
    100 
    101 		TAILQ_INSERT_TAIL(&dev->files, priv, link);
    102 	}
    103 	DRM_UNLOCK();
    104 
    105 	return 0;
    106 }
    107 
    108 #elif   defined(__FreeBSD__)
    109 
    110 /* drm_open_helper is called whenever a process opens /dev/drm. */
    111 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
    112 		    struct drm_device *dev)
    113 {
    114 	struct drm_file *priv;
    115 	int m = minor(kdev);
    116 	int retcode;
    117 
    118 	if (flags & O_EXCL)
    119 		return EBUSY; /* No exclusive opens */
    120 	dev->flags = flags;
    121 
    122 	DRM_DEBUG("pid = %d, minor = %d\n", DRM_CURRENTPID, m);
    123 
    124 	priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
    125 	if (priv == NULL) {
    126 		return ENOMEM;
    127 	}
    128 
    129 	retcode = devfs_set_cdevpriv(priv, drm_close);
    130 	if (retcode != 0) {
    131 		free(priv, DRM_MEM_FILES);
    132 		return retcode;
    133 	}
    134 
    135 	DRM_LOCK();
    136 	priv->dev		= dev;
    137 	priv->uid		= p->td_ucred->cr_svuid;
    138 	priv->pid		= p->td_proc->p_pid;
    139 	priv->minor		= m;
    140 	priv->ioctl_count 	= 0;
    141 
    142 	/* for compatibility root is always authenticated */
    143 	priv->authenticated	= DRM_SUSER(p);
    144 
    145 	if (dev->driver->open) {
    146 		/* shared code returns -errno */
    147 		retcode = -dev->driver->open(dev, priv);
    148 		if (retcode != 0) {
    149 			devfs_clear_cdevpriv();
    150 			free(priv, DRM_MEM_FILES);
    151 			DRM_UNLOCK();
    152 			return retcode;
    153 		}
    154 	}
    155 
    156 	/* first opener automatically becomes master */
    157 	priv->master = TAILQ_EMPTY(&dev->files);
    158 
    159 	TAILQ_INSERT_TAIL(&dev->files, priv, link);
    160 	DRM_UNLOCK();
    161 	kdev->si_drv1 = dev;
    162 	return 0;
    163 }
    164 #endif
    165 
    166 /* The drm_read and drm_poll are stubs to prevent spurious errors
    167  * on older X Servers (4.3.0 and earlier) */
    168 
    169 int drm_read(DRM_CDEV kdev, struct uio *uio, int ioflag)
    170 {
    171 	return 0;
    172 }
    173 
    174 int drm_poll(DRM_CDEV kdev, int events, DRM_STRUCTCDEVPROC *p)
    175 {
    176 	return 0;
    177 }
    178