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       1                 :            : /*
       2                 :            :  * 32-bit ioctl compatibility routines for the i915 DRM.
       3                 :            :  *
       4                 :            :  * Copyright (C) Paul Mackerras 2005
       5                 :            :  * Copyright (C) Alan Hourihane 2005
       6                 :            :  * All Rights Reserved.
       7                 :            :  *
       8                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a
       9                 :            :  * copy of this software and associated documentation files (the "Software"),
      10                 :            :  * to deal in the Software without restriction, including without limitation
      11                 :            :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      12                 :            :  * and/or sell copies of the Software, and to permit persons to whom the
      13                 :            :  * Software is furnished to do so, subject to the following conditions:
      14                 :            :  *
      15                 :            :  * The above copyright notice and this permission notice (including the next
      16                 :            :  * paragraph) shall be included in all copies or substantial portions of the
      17                 :            :  * Software.
      18                 :            :  *
      19                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      20                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      21                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
      22                 :            :  * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
      23                 :            :  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      24                 :            :  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
      25                 :            :  * IN THE SOFTWARE.
      26                 :            :  *
      27                 :            :  * Author: Alan Hourihane <alanh@fairlite.demon.co.uk>
      28                 :            :  */
      29                 :            : #include <linux/compat.h>
      30                 :            : 
      31                 :            : #include <drm/i915_drm.h>
      32                 :            : #include <drm/drm_ioctl.h>
      33                 :            : #include "i915_drv.h"
      34                 :            : 
      35                 :            : struct drm_i915_getparam32 {
      36                 :            :         s32 param;
      37                 :            :         /*
      38                 :            :          * We screwed up the generic ioctl struct here and used a variable-sized
      39                 :            :          * pointer. Use u32 in the compat struct to match the 32bit pointer
      40                 :            :          * userspace expects.
      41                 :            :          */
      42                 :            :         u32 value;
      43                 :            : };
      44                 :            : 
      45                 :          0 : static int compat_i915_getparam(struct file *file, unsigned int cmd,
      46                 :            :                                 unsigned long arg)
      47                 :            : {
      48                 :          0 :         struct drm_i915_getparam32 req32;
      49                 :          0 :         drm_i915_getparam_t __user *request;
      50                 :            : 
      51         [ #  # ]:          0 :         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
      52                 :            :                 return -EFAULT;
      53                 :            : 
      54                 :          0 :         request = compat_alloc_user_space(sizeof(*request));
      55         [ #  # ]:          0 :         if (!access_ok(request, sizeof(*request)) ||
      56   [ #  #  #  # ]:          0 :             __put_user(req32.param, &request->param) ||
      57   [ #  #  #  # ]:          0 :             __put_user((void __user *)(unsigned long)req32.value,
      58                 :            :                        &request->value))
      59                 :          0 :                 return -EFAULT;
      60                 :            : 
      61                 :          0 :         return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM,
      62                 :            :                          (unsigned long)request);
      63                 :            : }
      64                 :            : 
      65                 :            : static drm_ioctl_compat_t *i915_compat_ioctls[] = {
      66                 :            :         [DRM_I915_GETPARAM] = compat_i915_getparam,
      67                 :            : };
      68                 :            : 
      69                 :            : /**
      70                 :            :  * i915_compat_ioctl - handle the mistakes of the past
      71                 :            :  * @filp: the file pointer
      72                 :            :  * @cmd: the ioctl command (and encoded flags)
      73                 :            :  * @arg: the ioctl argument (from userspace)
      74                 :            :  *
      75                 :            :  * Called whenever a 32-bit process running under a 64-bit kernel
      76                 :            :  * performs an ioctl on /dev/dri/card<n>.
      77                 :            :  */
      78                 :          0 : long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
      79                 :            : {
      80                 :          0 :         unsigned int nr = DRM_IOCTL_NR(cmd);
      81                 :          0 :         drm_ioctl_compat_t *fn = NULL;
      82                 :          0 :         int ret;
      83                 :            : 
      84         [ #  # ]:          0 :         if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END)
      85                 :          0 :                 return drm_compat_ioctl(filp, cmd, arg);
      86                 :            : 
      87         [ #  # ]:          0 :         if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls))
      88                 :          0 :                 fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
      89                 :            : 
      90         [ #  # ]:          0 :         if (fn != NULL)
      91                 :          0 :                 ret = (*fn) (filp, cmd, arg);
      92                 :            :         else
      93                 :          0 :                 ret = drm_ioctl(filp, cmd, arg);
      94                 :            : 
      95                 :          0 :         return ret;
      96                 :            : }