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nouveau_ioc32.c revision 1.1 
      1 /**
      2  * \file mga_ioc32.c
      3  *
      4  * 32-bit ioctl compatibility routines for the MGA DRM.
      5  *
      6  * \author Dave Airlie <airlied (at) 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  */
     49 long 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 + DRM_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