drivers/char/drm/r128_ioc32.c

   1 /**
   2  * \file r128_ioc32.c
   3  *
   4  * 32-bit ioctl compatibility routines for the R128 DRM.
   5  *
   6  * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
   7  *
   8  * Copyright (C) Paul Mackerras 2005
   9  * Copyright (C) Egbert Eich 2003,2004
  10  * Copyright (C) Dave Airlie 2005
  11  * All Rights Reserved.
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a
  14  * copy of this software and associated documentation files (the "Software"),
  15  * to deal in the Software without restriction, including without limitation
  16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  17  * and/or sell copies of the Software, and to permit persons to whom the
  18  * Software is furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice (including the next
  21  * paragraph) shall be included in all copies or substantial portions of the
  22  * Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  27  * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  28  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  29  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  30  * IN THE SOFTWARE.
  31  */
  32 #include <linux/compat.h>
  33
  34 #include "drmP.h"
  35 #include "drm.h"
  36 #include "r128_drm.h"
  37
  38 typedef struct drm_r128_init32 {
  39         int func;
  40         unsigned int sarea_priv_offset;
  41         int is_pci;
  42         int cce_mode;
  43         int cce_secure;
  44         int ring_size;
  45         int usec_timeout;
  46
  47         unsigned int fb_bpp;
  48         unsigned int front_offset, front_pitch;
  49         unsigned int back_offset, back_pitch;
  50         unsigned int depth_bpp;
  51         unsigned int depth_offset, depth_pitch;
  52         unsigned int span_offset;
  53
  54         unsigned int fb_offset;
  55         unsigned int mmio_offset;
  56         unsigned int ring_offset;
  57         unsigned int ring_rptr_offset;
  58         unsigned int buffers_offset;
  59         unsigned int agp_textures_offset;
  60 } drm_r128_init32_t;
  61
  62 static int compat_r128_init(struct file *file, unsigned int cmd,
  63                             unsigned long arg)
  64 {
  65         drm_r128_init32_t init32;
  66         drm_r128_init_t __user *init;
  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.is_pci, &init->is_pci)
  76             || __put_user(init32.cce_mode, &init->cce_mode)
  77             || __put_user(init32.cce_secure, &init->cce_secure)
  78             || __put_user(init32.ring_size, &init->ring_size)
  79             || __put_user(init32.usec_timeout, &init->usec_timeout)
  80             || __put_user(init32.fb_bpp, &init->fb_bpp)
  81             || __put_user(init32.front_offset, &init->front_offset)
  82             || __put_user(init32.front_pitch, &init->front_pitch)
  83             || __put_user(init32.back_offset, &init->back_offset)
  84             || __put_user(init32.back_pitch, &init->back_pitch)
  85             || __put_user(init32.depth_bpp, &init->depth_bpp)
  86             || __put_user(init32.depth_offset, &init->depth_offset)
  87             || __put_user(init32.depth_pitch, &init->depth_pitch)
  88             || __put_user(init32.span_offset, &init->span_offset)
  89             || __put_user(init32.fb_offset, &init->fb_offset)
  90             || __put_user(init32.mmio_offset, &init->mmio_offset)
  91             || __put_user(init32.ring_offset, &init->ring_offset)
  92             || __put_user(init32.ring_rptr_offset, &init->ring_rptr_offset)
  93             || __put_user(init32.buffers_offset, &init->buffers_offset)
  94             || __put_user(init32.agp_textures_offset,
  95                           &init->agp_textures_offset))
  96                 return -EFAULT;
  97
  98         return drm_ioctl(file->f_path.dentry->d_inode, file,
  99                          DRM_IOCTL_R128_INIT, (unsigned long)init);
 100 }
 101
 102 typedef struct drm_r128_depth32 {
 103         int func;
 104         int n;
 105         u32 x;
 106         u32 y;
 107         u32 buffer;
 108         u32 mask;
 109 } drm_r128_depth32_t;
 110
 111 static int compat_r128_depth(struct file *file, unsigned int cmd,
 112                              unsigned long arg)
 113 {
 114         drm_r128_depth32_t depth32;
 115         drm_r128_depth_t __user *depth;
 116
 117         if (copy_from_user(&depth32, (void __user *)arg, sizeof(depth32)))
 118                 return -EFAULT;
 119
 120         depth = compat_alloc_user_space(sizeof(*depth));
 121         if (!access_ok(VERIFY_WRITE, depth, sizeof(*depth))
 122             || __put_user(depth32.func, &depth->func)
 123             || __put_user(depth32.n, &depth->n)
 124             || __put_user((int __user *)(unsigned long)depth32.x, &depth->x)
 125             || __put_user((int __user *)(unsigned long)depth32.y, &depth->y)
 126             || __put_user((unsigned int __user *)(unsigned long)depth32.buffer,
 127                           &depth->buffer)
 128             || __put_user((unsigned char __user *)(unsigned long)depth32.mask,
 129                           &depth->mask))
 130                 return -EFAULT;
 131
 132         return drm_ioctl(file->f_path.dentry->d_inode, file,
 133                          DRM_IOCTL_R128_DEPTH, (unsigned long)depth);
 134
 135 }
 136
 137 typedef struct drm_r128_stipple32 {
 138         u32 mask;
 139 } drm_r128_stipple32_t;
 140
 141 static int compat_r128_stipple(struct file *file, unsigned int cmd,
 142                                unsigned long arg)
 143 {
 144         drm_r128_stipple32_t stipple32;
 145         drm_r128_stipple_t __user *stipple;
 146
 147         if (copy_from_user(&stipple32, (void __user *)arg, sizeof(stipple32)))
 148                 return -EFAULT;
 149
 150         stipple = compat_alloc_user_space(sizeof(*stipple));
 151         if (!access_ok(VERIFY_WRITE, stipple, sizeof(*stipple))
 152             || __put_user((unsigned int __user *)(unsigned long)stipple32.mask,
 153                           &stipple->mask))
 154                 return -EFAULT;
 155
 156         return drm_ioctl(file->f_path.dentry->d_inode, file,
 157                          DRM_IOCTL_R128_STIPPLE, (unsigned long)stipple);
 158 }
 159
 160 typedef struct drm_r128_getparam32 {
 161         int param;
 162         u32 value;
 163 } drm_r128_getparam32_t;
 164
 165 static int compat_r128_getparam(struct file *file, unsigned int cmd,
 166                                 unsigned long arg)
 167 {
 168         drm_r128_getparam32_t getparam32;
 169         drm_r128_getparam_t __user *getparam;
 170
 171         if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
 172                 return -EFAULT;
 173
 174         getparam = compat_alloc_user_space(sizeof(*getparam));
 175         if (!access_ok(VERIFY_WRITE, getparam, sizeof(*getparam))
 176             || __put_user(getparam32.param, &getparam->param)
 177             || __put_user((void __user *)(unsigned long)getparam32.value,
 178                           &getparam->value))
 179                 return -EFAULT;
 180
 181         return drm_ioctl(file->f_path.dentry->d_inode, file,
 182                          DRM_IOCTL_R128_GETPARAM, (unsigned long)getparam);
 183 }
 184
 185 drm_ioctl_compat_t *r128_compat_ioctls[] = {
 186         [DRM_R128_INIT] = compat_r128_init,
 187         [DRM_R128_DEPTH] = compat_r128_depth,
 188         [DRM_R128_STIPPLE] = compat_r128_stipple,
 189         [DRM_R128_GETPARAM] = compat_r128_getparam,
 190 };
 191
 192 /**
 193  * Called whenever a 32-bit process running under a 64-bit kernel
 194  * performs an ioctl on /dev/dri/card<n>.
 195  *
 196  * \param filp file pointer.
 197  * \param cmd command.
 198  * \param arg user argument.
 199  * \return zero on success or negative number on failure.
 200  */
 201 long r128_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 202 {
 203         unsigned int nr = DRM_IOCTL_NR(cmd);
 204         drm_ioctl_compat_t *fn = NULL;
 205         int ret;
 206
 207         if (nr < DRM_COMMAND_BASE)
 208                 return drm_compat_ioctl(filp, cmd, arg);
 209
 210         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(r128_compat_ioctls))
 211                 fn = r128_compat_ioctls[nr - DRM_COMMAND_BASE];
 212
 213         lock_kernel();          /* XXX for now */
 214         if (fn != NULL)
 215                 ret = (*fn) (filp, cmd, arg);
 216         else
 217                 ret = drm_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
 218         unlock_kernel();
 219
 220         return ret;
 221 }