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
  35 #include "drmP.h"
  36 #include "drm.h"
  37 #include "mga_drm.h"
  38
  39 typedef struct drm32_mga_init {
  40         int func;
  41         u32 sarea_priv_offset;
  42         int chipset;
  43         int sgram;
  44         unsigned int maccess;
  45         unsigned int fb_cpp;
  46         unsigned int front_offset, front_pitch;
  47         unsigned int back_offset, back_pitch;
  48         unsigned int depth_cpp;
  49         unsigned int depth_offset, depth_pitch;
  50         unsigned int texture_offset[MGA_NR_TEX_HEAPS];
  51         unsigned int texture_size[MGA_NR_TEX_HEAPS];
  52         u32 fb_offset;
  53         u32 mmio_offset;
  54         u32 status_offset;
  55         u32 warp_offset;
  56         u32 primary_offset;
  57         u32 buffers_offset;
  58 } drm_mga_init32_t;
  59
  60 static int compat_mga_init(struct file *file, unsigned int cmd,
  61                            unsigned long arg)
  62 {
  63         drm_mga_init32_t init32;
  64         drm_mga_init_t __user *init;
  65         int err = 0, i;
  66
  67         if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
  68                 return -EFAULT;
  69
  70         init = compat_alloc_user_space(sizeof(*init));
  71         if (!access_ok(VERIFY_WRITE, init, sizeof(*init))
  72             || __put_user(init32.func, &init->func)
  73             || __put_user(init32.sarea_priv_offset, &init->sarea_priv_offset)
  74             || __put_user(init32.chipset, &init->chipset)
  75             || __put_user(init32.sgram, &init->sgram)
  76             || __put_user(init32.maccess, &init->maccess)
  77             || __put_user(init32.fb_cpp, &init->fb_cpp)
  78             || __put_user(init32.front_offset, &init->front_offset)
  79             || __put_user(init32.front_pitch, &init->front_pitch)
  80             || __put_user(init32.back_offset, &init->back_offset)
  81             || __put_user(init32.back_pitch, &init->back_pitch)
  82             || __put_user(init32.depth_cpp, &init->depth_cpp)
  83             || __put_user(init32.depth_offset, &init->depth_offset)
  84             || __put_user(init32.depth_pitch, &init->depth_pitch)
  85             || __put_user(init32.fb_offset, &init->fb_offset)
  86             || __put_user(init32.mmio_offset, &init->mmio_offset)
  87             || __put_user(init32.status_offset, &init->status_offset)
  88             || __put_user(init32.warp_offset, &init->warp_offset)
  89             || __put_user(init32.primary_offset, &init->primary_offset)
  90             || __put_user(init32.buffers_offset, &init->buffers_offset))
  91                 return -EFAULT;
  92
  93         for (i = 0; i < MGA_NR_TEX_HEAPS; i++) {
  94                 err |=
  95                     __put_user(init32.texture_offset[i],
  96                                &init->texture_offset[i]);
  97                 err |=
  98                     __put_user(init32.texture_size[i], &init->texture_size[i]);
  99         }
 100         if (err)
 101                 return -EFAULT;
 102
 103         return drm_ioctl(file->f_path.dentry->d_inode, file,
 104                          DRM_IOCTL_MGA_INIT, (unsigned long)init);
 105 }
 106
 107 typedef struct drm_mga_getparam32 {
 108         int param;
 109         u32 value;
 110 } drm_mga_getparam32_t;
 111
 112 static int compat_mga_getparam(struct file *file, unsigned int cmd,
 113                                unsigned long arg)
 114 {
 115         drm_mga_getparam32_t getparam32;
 116         drm_mga_getparam_t __user *getparam;
 117
 118         if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
 119                 return -EFAULT;
 120
 121         getparam = compat_alloc_user_space(sizeof(*getparam));
 122         if (!access_ok(VERIFY_WRITE, getparam, sizeof(*getparam))
 123             || __put_user(getparam32.param, &getparam->param)
 124             || __put_user((void __user *)(unsigned long)getparam32.value,
 125                           &getparam->value))
 126                 return -EFAULT;
 127
 128         return drm_ioctl(file->f_path.dentry->d_inode, file,
 129                          DRM_IOCTL_MGA_GETPARAM, (unsigned long)getparam);
 130 }
 131
 132 typedef struct drm_mga_drm_bootstrap32 {
 133         u32 texture_handle;
 134         u32 texture_size;
 135         u32 primary_size;
 136         u32 secondary_bin_count;
 137         u32 secondary_bin_size;
 138         u32 agp_mode;
 139         u8 agp_size;
 140 } drm_mga_dma_bootstrap32_t;
 141
 142 static int compat_mga_dma_bootstrap(struct file *file, unsigned int cmd,
 143                                     unsigned long arg)
 144 {
 145         drm_mga_dma_bootstrap32_t dma_bootstrap32;
 146         drm_mga_dma_bootstrap_t __user *dma_bootstrap;
 147         int err;
 148
 149         if (copy_from_user(&dma_bootstrap32, (void __user *)arg,
 150                            sizeof(dma_bootstrap32)))
 151                 return -EFAULT;
 152
 153         dma_bootstrap = compat_alloc_user_space(sizeof(*dma_bootstrap));
 154         if (!access_ok(VERIFY_WRITE, dma_bootstrap, sizeof(*dma_bootstrap))
 155             || __put_user(dma_bootstrap32.texture_handle,
 156                           &dma_bootstrap->texture_handle)
 157             || __put_user(dma_bootstrap32.texture_size,
 158                           &dma_bootstrap->texture_size)
 159             || __put_user(dma_bootstrap32.primary_size,
 160                           &dma_bootstrap->primary_size)
 161             || __put_user(dma_bootstrap32.secondary_bin_count,
 162                           &dma_bootstrap->secondary_bin_count)
 163             || __put_user(dma_bootstrap32.secondary_bin_size,
 164                           &dma_bootstrap->secondary_bin_size)
 165             || __put_user(dma_bootstrap32.agp_mode, &dma_bootstrap->agp_mode)
 166             || __put_user(dma_bootstrap32.agp_size, &dma_bootstrap->agp_size))
 167                 return -EFAULT;
 168
 169         err = drm_ioctl(file->f_path.dentry->d_inode, file,
 170                         DRM_IOCTL_MGA_DMA_BOOTSTRAP,
 171                         (unsigned long)dma_bootstrap);
 172         if (err)
 173                 return err;
 174
 175         if (__get_user(dma_bootstrap32.texture_handle,
 176                        &dma_bootstrap->texture_handle)
 177             || __get_user(dma_bootstrap32.texture_size,
 178                           &dma_bootstrap->texture_size)
 179             || __get_user(dma_bootstrap32.primary_size,
 180                           &dma_bootstrap->primary_size)
 181             || __get_user(dma_bootstrap32.secondary_bin_count,
 182                           &dma_bootstrap->secondary_bin_count)
 183             || __get_user(dma_bootstrap32.secondary_bin_size,
 184                           &dma_bootstrap->secondary_bin_size)
 185             || __get_user(dma_bootstrap32.agp_mode, &dma_bootstrap->agp_mode)
 186             || __get_user(dma_bootstrap32.agp_size, &dma_bootstrap->agp_size))
 187                 return -EFAULT;
 188
 189         if (copy_to_user((void __user *)arg, &dma_bootstrap32,
 190                          sizeof(dma_bootstrap32)))
 191                 return -EFAULT;
 192
 193         return 0;
 194 }
 195
 196 drm_ioctl_compat_t *mga_compat_ioctls[] = {
 197         [DRM_MGA_INIT] = compat_mga_init,
 198         [DRM_MGA_GETPARAM] = compat_mga_getparam,
 199         [DRM_MGA_DMA_BOOTSTRAP] = compat_mga_dma_bootstrap,
 200 };
 201
 202 /**
 203  * Called whenever a 32-bit process running under a 64-bit kernel
 204  * performs an ioctl on /dev/dri/card<n>.
 205  *
 206  * \param filp file pointer.
 207  * \param cmd command.
 208  * \param arg user argument.
 209  * \return zero on success or negative number on failure.
 210  */
 211 long mga_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 212 {
 213         unsigned int nr = DRM_IOCTL_NR(cmd);
 214         drm_ioctl_compat_t *fn = NULL;
 215         int ret;
 216
 217         if (nr < DRM_COMMAND_BASE)
 218                 return drm_compat_ioctl(filp, cmd, arg);
 219
 220         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(mga_compat_ioctls))
 221                 fn = mga_compat_ioctls[nr - DRM_COMMAND_BASE];
 222
 223         lock_kernel();          /* XXX for now */
 224         if (fn != NULL)
 225                 ret = (*fn) (filp, cmd, arg);
 226         else
 227                 ret = drm_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
 228         unlock_kernel();
 229
 230         return ret;
 231 }