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 #include <linux/ioctl32.h>
  34
  35 #include "drmP.h"
  36 #include "drm.h"
  37 #include "r128_drm.h"
  38
  39 typedef struct drm_r128_init32 {
  40         int func;
  41         unsigned int sarea_priv_offset;
  42         int is_pci;
  43         int cce_mode;
  44         int cce_secure;
  45         int ring_size;
  46         int usec_timeout;
  47
  48         unsigned int fb_bpp;
  49         unsigned int front_offset, front_pitch;
  50         unsigned int back_offset, back_pitch;
  51         unsigned int depth_bpp;
  52         unsigned int depth_offset, depth_pitch;
  53         unsigned int span_offset;
  54
  55         unsigned int fb_offset;
  56         unsigned int mmio_offset;
  57         unsigned int ring_offset;
  58         unsigned int ring_rptr_offset;
  59         unsigned int buffers_offset;
  60         unsigned int agp_textures_offset;
  61 } drm_r128_init32_t;
  62
  63 static int compat_r128_init(struct file *file, unsigned int cmd,
  64                             unsigned long arg)
  65 {
  66         drm_r128_init32_t init32;
  67         drm_r128_init_t __user *init;
  68
  69         if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
  70                 return -EFAULT;
  71
  72         init = compat_alloc_user_space(sizeof(*init));
  73         if (!access_ok(VERIFY_WRITE, init, sizeof(*init))
  74             || __put_user(init32.func, &init->func)
  75             || __put_user(init32.sarea_priv_offset, &init->sarea_priv_offset)
  76             || __put_user(init32.is_pci, &init->is_pci)
  77             || __put_user(init32.cce_mode, &init->cce_mode)
  78             || __put_user(init32.cce_secure, &init->cce_secure)
  79             || __put_user(init32.ring_size, &init->ring_size)
  80             || __put_user(init32.usec_timeout, &init->usec_timeout)
  81             || __put_user(init32.fb_bpp, &init->fb_bpp)
  82             || __put_user(init32.front_offset, &init->front_offset)
  83             || __put_user(init32.front_pitch, &init->front_pitch)
  84             || __put_user(init32.back_offset, &init->back_offset)
  85             || __put_user(init32.back_pitch, &init->back_pitch)
  86             || __put_user(init32.depth_bpp, &init->depth_bpp)
  87             || __put_user(init32.depth_offset, &init->depth_offset)
  88             || __put_user(init32.depth_pitch, &init->depth_pitch)
  89             || __put_user(init32.span_offset, &init->span_offset)
  90             || __put_user(init32.fb_offset, &init->fb_offset)
  91             || __put_user(init32.mmio_offset, &init->mmio_offset)
  92             || __put_user(init32.ring_offset, &init->ring_offset)
  93             || __put_user(init32.ring_rptr_offset, &init->ring_rptr_offset)
  94             || __put_user(init32.buffers_offset, &init->buffers_offset)
  95             || __put_user(init32.agp_textures_offset,
  96                           &init->agp_textures_offset))
  97                 return -EFAULT;
  98
  99         return drm_ioctl(file->f_dentry->d_inode, file,
 100                          DRM_IOCTL_R128_INIT, (unsigned long)init);
 101 }
 102
 103 typedef struct drm_r128_depth32 {
 104         int func;
 105         int n;
 106         u32 x;
 107         u32 y;
 108         u32 buffer;
 109         u32 mask;
 110 } drm_r128_depth32_t;
 111
 112 static int compat_r128_depth(struct file *file, unsigned int cmd,
 113                              unsigned long arg)
 114 {
 115         drm_r128_depth32_t depth32;
 116         drm_r128_depth_t __user *depth;
 117
 118         if (copy_from_user(&depth32, (void __user *)arg, sizeof(depth32)))
 119                 return -EFAULT;
 120
 121         depth = compat_alloc_user_space(sizeof(*depth));
 122         if (!access_ok(VERIFY_WRITE, depth, sizeof(*depth))
 123             || __put_user(depth32.func, &depth->func)
 124             || __put_user(depth32.n, &depth->n)
 125             || __put_user((int __user *)(unsigned long)depth32.x, &depth->x)
 126             || __put_user((int __user *)(unsigned long)depth32.y, &depth->y)
 127             || __put_user((unsigned int __user *)(unsigned long)depth32.buffer,
 128                           &depth->buffer)
 129             || __put_user((unsigned char __user *)(unsigned long)depth32.mask,
 130                           &depth->mask))
 131                 return -EFAULT;
 132
 133         return drm_ioctl(file->f_dentry->d_inode, file,
 134                          DRM_IOCTL_R128_DEPTH, (unsigned long)depth);
 135
 136 }
 137
 138 typedef struct drm_r128_stipple32 {
 139         u32 mask;
 140 } drm_r128_stipple32_t;
 141
 142 static int compat_r128_stipple(struct file *file, unsigned int cmd,
 143                                unsigned long arg)
 144 {
 145         drm_r128_stipple32_t stipple32;
 146         drm_r128_stipple_t __user *stipple;
 147
 148         if (copy_from_user(&stipple32, (void __user *)arg, sizeof(stipple32)))
 149                 return -EFAULT;
 150
 151         stipple = compat_alloc_user_space(sizeof(*stipple));
 152         if (!access_ok(VERIFY_WRITE, stipple, sizeof(*stipple))
 153             || __put_user((unsigned int __user *)(unsigned long)stipple32.mask,
 154                           &stipple->mask))
 155                 return -EFAULT;
 156
 157         return drm_ioctl(file->f_dentry->d_inode, file,
 158                          DRM_IOCTL_R128_STIPPLE, (unsigned long)stipple);
 159 }
 160
 161 typedef struct drm_r128_getparam32 {
 162         int param;
 163         u32 value;
 164 } drm_r128_getparam32_t;
 165
 166 static int compat_r128_getparam(struct file *file, unsigned int cmd,
 167                                 unsigned long arg)
 168 {
 169         drm_r128_getparam32_t getparam32;
 170         drm_r128_getparam_t __user *getparam;
 171
 172         if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
 173                 return -EFAULT;
 174
 175         getparam = compat_alloc_user_space(sizeof(*getparam));
 176         if (!access_ok(VERIFY_WRITE, getparam, sizeof(*getparam))
 177             || __put_user(getparam32.param, &getparam->param)
 178             || __put_user((void __user *)(unsigned long)getparam32.value,
 179                           &getparam->value))
 180                 return -EFAULT;
 181
 182         return drm_ioctl(file->f_dentry->d_inode, file,
 183                          DRM_IOCTL_R128_GETPARAM, (unsigned long)getparam);
 184 }
 185
 186 drm_ioctl_compat_t *r128_compat_ioctls[] = {
 187         [DRM_R128_INIT] = compat_r128_init,
 188         [DRM_R128_DEPTH] = compat_r128_depth,
 189         [DRM_R128_STIPPLE] = compat_r128_stipple,
 190         [DRM_R128_GETPARAM] = compat_r128_getparam,
 191 };
 192
 193 /**
 194  * Called whenever a 32-bit process running under a 64-bit kernel
 195  * performs an ioctl on /dev/dri/card<n>.
 196  *
 197  * \param filp file pointer.
 198  * \param cmd command.
 199  * \param arg user argument.
 200  * \return zero on success or negative number on failure.
 201  */
 202 long r128_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 203 {
 204         unsigned int nr = DRM_IOCTL_NR(cmd);
 205         drm_ioctl_compat_t *fn = NULL;
 206         int ret;
 207
 208         if (nr < DRM_COMMAND_BASE)
 209                 return drm_compat_ioctl(filp, cmd, arg);
 210
 211         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(r128_compat_ioctls))
 212                 fn = r128_compat_ioctls[nr - DRM_COMMAND_BASE];
 213
 214         lock_kernel();          /* XXX for now */
 215         if (fn != NULL)
 216                 ret = (*fn) (filp, cmd, arg);
 217         else
 218                 ret = drm_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
 219         unlock_kernel();
 220
 221         return ret;
 222 }