drivers/char/drm/mga_ioc32.c

   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 #include <linux/compat.h>
  34 #include <linux/ioctl32.h>
  35
  36 #include "drmP.h"
  37 #include "drm.h"
  38 #include "mga_drm.h"
  39
  40 typedef struct drm32_mga_init {
  41         int func;
  42         u32 sarea_priv_offset;
  43         int chipset;
  44         int sgram;
  45         unsigned int maccess;
  46         unsigned int fb_cpp;
  47         unsigned int front_offset, front_pitch;
  48         unsigned int back_offset, back_pitch;
  49         unsigned int depth_cpp;
  50         unsigned int depth_offset, depth_pitch;
  51         unsigned int texture_offset[MGA_NR_TEX_HEAPS];
  52         unsigned int texture_size[MGA_NR_TEX_HEAPS];
  53         u32 fb_offset;
  54         u32 mmio_offset;
  55         u32 status_offset;
  56         u32 warp_offset;
  57         u32 primary_offset;
  58         u32 buffers_offset;
  59 } drm_mga_init32_t;
  60
  61 static int compat_mga_init(struct file *file, unsigned int cmd,
  62                            unsigned long arg)
  63 {
  64         drm_mga_init32_t init32;
  65         drm_mga_init_t __user *init;
  66         int err = 0, i;
  67
  68         if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
  69                 return -EFAULT;
  70
  71         init = compat_alloc_user_space(sizeof(*init));
  72         if (!access_ok(VERIFY_WRITE, init, sizeof(*init))
  73             || __put_user(init32.func, &init->func)
  74             || __put_user(init32.sarea_priv_offset, &init->sarea_priv_offset)
  75             || __put_user(init32.chipset, &init->chipset)
  76             || __put_user(init32.sgram, &init->sgram)
  77             || __put_user(init32.maccess, &init->maccess)
  78             || __put_user(init32.fb_cpp, &init->fb_cpp)
  79             || __put_user(init32.front_offset, &init->front_offset)
  80             || __put_user(init32.front_pitch, &init->front_pitch)
  81             || __put_user(init32.back_offset, &init->back_offset)
  82             || __put_user(init32.back_pitch, &init->back_pitch)
  83             || __put_user(init32.depth_cpp, &init->depth_cpp)
  84             || __put_user(init32.depth_offset, &init->depth_offset)
  85             || __put_user(init32.depth_pitch, &init->depth_pitch)
  86             || __put_user(init32.fb_offset, &init->fb_offset)
  87             || __put_user(init32.mmio_offset, &init->mmio_offset)
  88             || __put_user(init32.status_offset, &init->status_offset)
  89             || __put_user(init32.warp_offset, &init->warp_offset)
  90             || __put_user(init32.primary_offset, &init->primary_offset)
  91             || __put_user(init32.buffers_offset, &init->buffers_offset))
  92                 return -EFAULT;
  93
  94         for (i=0; i<MGA_NR_TEX_HEAPS; i++)
  95         {
  96                 err |= __put_user(init32.texture_offset[i], &init->texture_offset[i]);
  97                 err |= __put_user(init32.texture_size[i], &init->texture_size[i]);
  98         }
  99         if (err)
 100                 return -EFAULT;
 101
 102         return drm_ioctl(file->f_dentry->d_inode, file,
 103                          DRM_IOCTL_MGA_INIT, (unsigned long) init);
 104 }
 105
 106
 107 typedef struct drm_mga_getparam32 {
 108         int param;
 109         u32 value;
 110 } drm_mga_getparam32_t;
 111
 112
 113 static int compat_mga_getparam(struct file *file, unsigned int cmd,
 114                                unsigned long arg)
 115 {
 116         drm_mga_getparam32_t getparam32;
 117         drm_mga_getparam_t __user *getparam;
 118
 119         if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
 120                 return -EFAULT;
 121
 122         getparam = compat_alloc_user_space(sizeof(*getparam));
 123         if (!access_ok(VERIFY_WRITE, getparam, sizeof(*getparam))
 124             || __put_user(getparam32.param, &getparam->param)
 125             || __put_user((void __user *)(unsigned long)getparam32.value, &getparam->value))
 126                 return -EFAULT;
 127
 128         return drm_ioctl(file->f_dentry->d_inode, file,
 129                          DRM_IOCTL_MGA_GETPARAM, (unsigned long)getparam);
 130 }
 131
 132 drm_ioctl_compat_t *mga_compat_ioctls[] = {
 133         [DRM_MGA_INIT] = compat_mga_init,
 134         [DRM_MGA_GETPARAM] = compat_mga_getparam,
 135 };
 136
 137 /**
 138  * Called whenever a 32-bit process running under a 64-bit kernel
 139  * performs an ioctl on /dev/dri/card<n>.
 140  *
 141  * \param filp file pointer.
 142  * \param cmd command.
 143  * \param arg user argument.
 144  * \return zero on success or negative number on failure.
 145  */
 146 long mga_compat_ioctl(struct file *filp, unsigned int cmd,
 147                          unsigned long arg)
 148 {
 149         unsigned int nr = DRM_IOCTL_NR(cmd);
 150         drm_ioctl_compat_t *fn = NULL;
 151         int ret;
 152
 153         if (nr < DRM_COMMAND_BASE)
 154                 return drm_compat_ioctl(filp, cmd, arg);
 155
 156         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(mga_compat_ioctls))
 157                 fn = mga_compat_ioctls[nr - DRM_COMMAND_BASE];
 158
 159         lock_kernel();          /* XXX for now */
 160         if (fn != NULL)
 161                 ret = (*fn)(filp, cmd, arg);
 162         else
 163                 ret = drm_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
 164         unlock_kernel();
 165
 166         return ret;
 167 }