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