drivers/char/drm/i915_ioc32.c

   1 /**
   2  * \file i915_ioc32.c
   3  *
   4  * 32-bit ioctl compatibility routines for the i915 DRM.
   5  *
   6  * \author Alan Hourihane <alanh@fairlite.demon.co.uk>
   7  *
   8  *
   9  * Copyright (C) Paul Mackerras 2005
  10  * Copyright (C) Alan Hourihane 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 "i915_drm.h"
  38
  39 typedef struct _drm_i915_batchbuffer32 {
  40         int start;              /* agp offset */
  41         int used;               /* nr bytes in use */
  42         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
  43         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
  44         int num_cliprects;      /* mulitpass with multiple cliprects? */
  45         u32 cliprects;          /* pointer to userspace cliprects */
  46 } drm_i915_batchbuffer32_t;
  47
  48 static int compat_i915_batchbuffer(struct file *file, unsigned int cmd,
  49                                    unsigned long arg)
  50 {
  51         drm_i915_batchbuffer32_t batchbuffer32;
  52         drm_i915_batchbuffer_t __user *batchbuffer;
  53
  54         if (copy_from_user
  55             (&batchbuffer32, (void __user *)arg, sizeof(batchbuffer32)))
  56                 return -EFAULT;
  57
  58         batchbuffer = compat_alloc_user_space(sizeof(*batchbuffer));
  59         if (!access_ok(VERIFY_WRITE, batchbuffer, sizeof(*batchbuffer))
  60             || __put_user(batchbuffer32.start, &batchbuffer->start)
  61             || __put_user(batchbuffer32.used, &batchbuffer->used)
  62             || __put_user(batchbuffer32.DR1, &batchbuffer->DR1)
  63             || __put_user(batchbuffer32.DR4, &batchbuffer->DR4)
  64             || __put_user(batchbuffer32.num_cliprects,
  65                           &batchbuffer->num_cliprects)
  66             || __put_user((int __user *)(unsigned long)batchbuffer32.cliprects,
  67                           &batchbuffer->cliprects))
  68                 return -EFAULT;
  69
  70         return drm_ioctl(file->f_dentry->d_inode, file,
  71                          DRM_IOCTL_I915_BATCHBUFFER,
  72                          (unsigned long)batchbuffer);
  73 }
  74
  75 typedef struct _drm_i915_cmdbuffer32 {
  76         u32 buf;                /* pointer to userspace command buffer */
  77         int sz;                 /* nr bytes in buf */
  78         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
  79         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
  80         int num_cliprects;      /* mulitpass with multiple cliprects? */
  81         u32 cliprects;          /* pointer to userspace cliprects */
  82 } drm_i915_cmdbuffer32_t;
  83
  84 static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
  85                                  unsigned long arg)
  86 {
  87         drm_i915_cmdbuffer32_t cmdbuffer32;
  88         drm_i915_cmdbuffer_t __user *cmdbuffer;
  89
  90         if (copy_from_user
  91             (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
  92                 return -EFAULT;
  93
  94         cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
  95         if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
  96             || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
  97                           &cmdbuffer->buf)
  98             || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
  99             || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
 100             || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
 101             || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
 102             || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
 103                           &cmdbuffer->cliprects))
 104                 return -EFAULT;
 105
 106         return drm_ioctl(file->f_dentry->d_inode, file,
 107                          DRM_IOCTL_I915_CMDBUFFER, (unsigned long)cmdbuffer);
 108 }
 109
 110 typedef struct drm_i915_irq_emit32 {
 111         u32 irq_seq;
 112 } drm_i915_irq_emit32_t;
 113
 114 static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
 115                                 unsigned long arg)
 116 {
 117         drm_i915_irq_emit32_t req32;
 118         drm_i915_irq_emit_t __user *request;
 119
 120         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 121                 return -EFAULT;
 122
 123         request = compat_alloc_user_space(sizeof(*request));
 124         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 125             || __put_user((int __user *)(unsigned long)req32.irq_seq,
 126                           &request->irq_seq))
 127                 return -EFAULT;
 128
 129         return drm_ioctl(file->f_dentry->d_inode, file,
 130                          DRM_IOCTL_I915_IRQ_EMIT, (unsigned long)request);
 131 }
 132 typedef struct drm_i915_getparam32 {
 133         int param;
 134         u32 value;
 135 } drm_i915_getparam32_t;
 136
 137 static int compat_i915_getparam(struct file *file, unsigned int cmd,
 138                                 unsigned long arg)
 139 {
 140         drm_i915_getparam32_t req32;
 141         drm_i915_getparam_t __user *request;
 142
 143         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 144                 return -EFAULT;
 145
 146         request = compat_alloc_user_space(sizeof(*request));
 147         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 148             || __put_user(req32.param, &request->param)
 149             || __put_user((void __user *)(unsigned long)req32.value,
 150                           &request->value))
 151                 return -EFAULT;
 152
 153         return drm_ioctl(file->f_dentry->d_inode, file,
 154                          DRM_IOCTL_I915_GETPARAM, (unsigned long)request);
 155 }
 156
 157 typedef struct drm_i915_mem_alloc32 {
 158         int region;
 159         int alignment;
 160         int size;
 161         u32 region_offset;      /* offset from start of fb or agp */
 162 } drm_i915_mem_alloc32_t;
 163
 164 static int compat_i915_alloc(struct file *file, unsigned int cmd,
 165                              unsigned long arg)
 166 {
 167         drm_i915_mem_alloc32_t req32;
 168         drm_i915_mem_alloc_t __user *request;
 169
 170         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 171                 return -EFAULT;
 172
 173         request = compat_alloc_user_space(sizeof(*request));
 174         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 175             || __put_user(req32.region, &request->region)
 176             || __put_user(req32.alignment, &request->alignment)
 177             || __put_user(req32.size, &request->size)
 178             || __put_user((void __user *)(unsigned long)req32.region_offset,
 179                           &request->region_offset))
 180                 return -EFAULT;
 181
 182         return drm_ioctl(file->f_dentry->d_inode, file,
 183                          DRM_IOCTL_I915_ALLOC, (unsigned long)request);
 184 }
 185
 186 drm_ioctl_compat_t *i915_compat_ioctls[] = {
 187         [DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
 188         [DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
 189         [DRM_I915_GETPARAM] = compat_i915_getparam,
 190         [DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
 191         [DRM_I915_ALLOC] = compat_i915_alloc
 192 };
 193
 194 /**
 195  * Called whenever a 32-bit process running under a 64-bit kernel
 196  * performs an ioctl on /dev/dri/card<n>.
 197  *
 198  * \param filp file pointer.
 199  * \param cmd command.
 200  * \param arg user argument.
 201  * \return zero on success or negative number on failure.
 202  */
 203 long i915_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 204 {
 205         unsigned int nr = DRM_IOCTL_NR(cmd);
 206         drm_ioctl_compat_t *fn = NULL;
 207         int ret;
 208
 209         if (nr < DRM_COMMAND_BASE)
 210                 return drm_compat_ioctl(filp, cmd, arg);
 211
 212         if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(i915_compat_ioctls))
 213                 fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
 214
 215         lock_kernel();          /* XXX for now */
 216         if (fn != NULL)
 217                 ret = (*fn) (filp, cmd, arg);
 218         else
 219                 ret = drm_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
 220         unlock_kernel();
 221
 222         return ret;
 223 }