LXR linux/drivers/gpu/drm/nouveau/nouveau

   1/**
   2 * \file mga_ioc32.c
   3 *
   4 * 32-bit ioctl compatibility routines for the MGA DRM.
   5 *
   6 * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
   7 *
   8 *
   9 * Copyright (C) Paul Mackerras 2005
  10 * Copyright (C) Egbert Eich 2003,2004
  11 * Copyright (C) Dave Airlie 2005
  12 * All Rights Reserved.
  13 *
  14 * Permission is hereby granted, free of charge, to any person obtaining a
  15 * copy of this software and associated documentation files (the "Software"),
  16 * to deal in the Software without restriction, including without limitation
  17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18 * and/or sell copies of the Software, and to permit persons to whom the
  19 * Software is furnished to do so, subject to the following conditions:
  20 *
  21 * The above copyright notice and this permission notice (including the next
  22 * paragraph) shall be included in all copies or substantial portions of the
  23 * Software.
  24 *
  25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28 * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  29 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  30 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  31 * IN THE SOFTWARE.
  32 */
  33
  34#include <linux/compat.h>
  35
  36#include <drm/drmP.h>
  37
  38#include "nouveau_ioctl.h"
  39
  40/**
  41 * Called whenever a 32-bit process running under a 64-bit kernel
  42 * performs an ioctl on /dev/dri/card<n>.
  43 *
  44 * \param filp file pointer.
  45 * \param cmd command.
  46 * \param arg user argument.
  47 * \return zero on success or negative number on failure.
  48 */
  49long nouveau_compat_ioctl(struct file *filp, unsigned int cmd,
  50                         unsigned long arg)
  51{
  52        unsigned int nr = DRM_IOCTL_NR(cmd);
  53        drm_ioctl_compat_t *fn = NULL;
  54        int ret;
  55
  56        if (nr < DRM_COMMAND_BASE)
  57                return drm_compat_ioctl(filp, cmd, arg);
  58
  59#if 0
  60        if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(mga_compat_ioctls))
  61                fn = nouveau_compat_ioctls[nr - DRM_COMMAND_BASE];
  62#endif
  63        if (fn != NULL)
  64                ret = (*fn)(filp, cmd, arg);
  65        else
  66                ret = nouveau_drm_ioctl(filp, cmd, arg);
  67
  68        return ret;
  69}
  70