drm_fops.c

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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@valinux.com>
   27  *    Daryll Strauss <daryll@valinux.com>
   28  *    Gareth Hughes <gareth@valinux.com>
   29  *
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/9.0/sys/dev/drm/drm_fops.c 196465 2009-08-23 14:31:20Z rnoland $");
   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. */
   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         retcode = devfs_set_cdevpriv(priv, drm_close);
   61         if (retcode != 0) {
   62                 free(priv, DRM_MEM_FILES);
   63                 return retcode;
   64         }
   65 
   66         DRM_LOCK();
   67         priv->dev               = dev;
   68         priv->uid               = p->td_ucred->cr_svuid;
   69         priv->pid               = p->td_proc->p_pid;
   70         priv->ioctl_count       = 0;
   71 
   72         /* for compatibility root is always authenticated */
   73         priv->authenticated     = DRM_SUSER(p);
   74 
   75         if (dev->driver->open) {
   76                 /* shared code returns -errno */
   77                 retcode = -dev->driver->open(dev, priv);
   78                 if (retcode != 0) {
   79                         devfs_clear_cdevpriv();
   80                         free(priv, DRM_MEM_FILES);
   81                         DRM_UNLOCK();
   82                         return retcode;
   83                 }
   84         }
   85 
   86         /* first opener automatically becomes master */
   87         priv->master = TAILQ_EMPTY(&dev->files);
   88 
   89         TAILQ_INSERT_TAIL(&dev->files, priv, link);
   90         DRM_UNLOCK();
   91         kdev->si_drv1 = dev;
   92         return 0;
   93 }
   94 
   95 
   96 /* The drm_read and drm_poll are stubs to prevent spurious errors
   97  * on older X Servers (4.3.0 and earlier) */
   98 
   99 int drm_read(struct cdev *kdev, struct uio *uio, int ioflag)
  100 {
  101         return 0;
  102 }
  103 
  104 int drm_poll(struct cdev *kdev, int events, DRM_STRUCTPROC *p)
  105 {
  106         return 0;
  107 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm/drm_fops.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_fops.c