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