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
  34 #include "drmP.h"
  35 #include "drm.h"
  36 #include "i915_drm.h"
  37
  38 typedef struct _drm_i915_batchbuffer32 {
  39         int start;              /* agp offset */
  40         int used;               /* nr bytes in use */
  41         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
  42         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
  43         int num_cliprects;      /* mulitpass with multiple cliprects? */
  44         u32 cliprects;          /* pointer to userspace cliprects */
  45 } drm_i915_batchbuffer32_t;
  46
  47 static int compat_i915_batchbuffer(struct file *file, unsigned int cmd,
  48                                    unsigned long arg)
  49 {
  50         drm_i915_batchbuffer32_t batchbuffer32;
  51         drm_i915_batchbuffer_t __user *batchbuffer;
  52
  53         if (copy_from_user
  54             (&batchbuffer32, (void __user *)arg, sizeof(batchbuffer32)))
  55                 return -EFAULT;
  56
  57         batchbuffer = compat_alloc_user_space(sizeof(*batchbuffer));
  58         if (!access_ok(VERIFY_WRITE, batchbuffer, sizeof(*batchbuffer))
  59             || __put_user(batchbuffer32.start, &batchbuffer->start)
  60             || __put_user(batchbuffer32.used, &batchbuffer->used)
  61             || __put_user(batchbuffer32.DR1, &batchbuffer->DR1)
  62             || __put_user(batchbuffer32.DR4, &batchbuffer->DR4)
  63             || __put_user(batchbuffer32.num_cliprects,
  64                           &batchbuffer->num_cliprects)
  65             || __put_user((int __user *)(unsigned long)batchbuffer32.cliprects,
  66                           &batchbuffer->cliprects))
  67                 return -EFAULT;
  68
  69         return drm_ioctl(file->f_path.dentry->d_inode, file,
  70                          DRM_IOCTL_I915_BATCHBUFFER,
  71                          (unsigned long)batchbuffer);
  72 }
  73
  74 typedef struct _drm_i915_cmdbuffer32 {
  75         u32 buf;                /* pointer to userspace command buffer */
  76         int sz;                 /* nr bytes in buf */
  77         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
  78         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
  79         int num_cliprects;      /* mulitpass with multiple cliprects? */
  80         u32 cliprects;          /* pointer to userspace cliprects */
  81 } drm_i915_cmdbuffer32_t;
  82
  83 static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
  84                                  unsigned long arg)
  85 {
  86         drm_i915_cmdbuffer32_t cmdbuffer32;
  87         drm_i915_cmdbuffer_t __user *cmdbuffer;
  88
  89         if (copy_from_user
  90             (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
  91                 return -EFAULT;
  92
  93         cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
  94         if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
  95             || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
  96                           &cmdbuffer->buf)
  97             || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
  98             || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
  99             || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
 100             || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
 101             || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
 102                           &cmdbuffer->cliprects))
 103                 return -EFAULT;
 104
 105         return drm_ioctl(file->f_path.dentry->d_inode, file,
 106                          DRM_IOCTL_I915_CMDBUFFER, (unsigned long)cmdbuffer);
 107 }
 108
 109 typedef struct drm_i915_irq_emit32 {
 110         u32 irq_seq;
 111 } drm_i915_irq_emit32_t;
 112
 113 static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
 114                                 unsigned long arg)
 115 {
 116         drm_i915_irq_emit32_t req32;
 117         drm_i915_irq_emit_t __user *request;
 118
 119         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 120                 return -EFAULT;
 121
 122         request = compat_alloc_user_space(sizeof(*request));
 123         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 124             || __put_user((int __user *)(unsigned long)req32.irq_seq,
 125                           &request->irq_seq))
 126                 return -EFAULT;
 127
 128         return drm_ioctl(file->f_path.dentry->d_inode, file,
 129                          DRM_IOCTL_I915_IRQ_EMIT, (unsigned long)request);
 130 }
 131 typedef struct drm_i915_getparam32 {
 132         int param;
 133         u32 value;
 134 } drm_i915_getparam32_t;
 135
 136 static int compat_i915_getparam(struct file *file, unsigned int cmd,
 137                                 unsigned long arg)
 138 {
 139         drm_i915_getparam32_t req32;
 140         drm_i915_getparam_t __user *request;
 141
 142         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 143                 return -EFAULT;
 144
 145         request = compat_alloc_user_space(sizeof(*request));
 146         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 147             || __put_user(req32.param, &request->param)
 148             || __put_user((void __user *)(unsigned long)req32.value,
 149                           &request->value))
 150                 return -EFAULT;
 151
 152         return drm_ioctl(file->f_path.dentry->d_inode, file,
 153                          DRM_IOCTL_I915_GETPARAM, (unsigned long)request);
 154 }
 155
 156 typedef struct drm_i915_mem_alloc32 {
 157         int region;
 158         int alignment;
 159         int size;
 160         u32 region_offset;      /* offset from start of fb or agp */
 161 } drm_i915_mem_alloc32_t;
 162
 163 static int compat_i915_alloc(struct file *file, unsigned int cmd,
 164                              unsigned long arg)
 165 {
 166         drm_i915_mem_alloc32_t req32;
 167         drm_i915_mem_alloc_t __user *request;
 168
 169         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 170                 return -EFAULT;
 171
 172         request = compat_alloc_user_space(sizeof(*request));
 173         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 174             || __put_user(req32.region, &request->region)
 175             || __put_user(req32.alignment, &request->alignment)
 176             || __put_user(req32.size, &request->size)
 177             || __put_user((void __user *)(unsigned long)req32.region_offset,
 178                           &request->region_offset))
 179                 return -EFAULT;
 180
 181         return drm_ioctl(file->f_path.dentry->d_inode, file,
 182                          DRM_IOCTL_I915_ALLOC, (unsigned long)request);
 183 }
 184
 185 drm_ioctl_compat_t *i915_compat_ioctls[] = {
 186         [DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
 187         [DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
 188         [DRM_I915_GETPARAM] = compat_i915_getparam,
 189         [DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
 190         [DRM_I915_ALLOC] = compat_i915_alloc
 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 i915_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(i915_compat_ioctls))
 212                 fn = i915_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_path.dentry->d_inode, filp, cmd, arg);
 219         unlock_kernel();
 220
 221         return ret;
 222 }