sys/external/bsd/drm/dist/bsd-core/drm_fops.c

   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  */
  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 }