drivers/gpu/drm/i915/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 <drm/drmP.h>
  35 #include <drm/i915_drm.h>
  36 #include "i915_drv.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, DRM_IOCTL_I915_BATCHBUFFER,
  70                          (unsigned long)batchbuffer);
  71 }
  72
  73 typedef struct _drm_i915_cmdbuffer32 {
  74         u32 buf;                /* pointer to userspace command buffer */
  75         int sz;                 /* nr bytes in buf */
  76         int DR1;                /* hw flags for GFX_OP_DRAWRECT_INFO */
  77         int DR4;                /* window origin for GFX_OP_DRAWRECT_INFO */
  78         int num_cliprects;      /* mulitpass with multiple cliprects? */
  79         u32 cliprects;          /* pointer to userspace cliprects */
  80 } drm_i915_cmdbuffer32_t;
  81
  82 static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
  83                                  unsigned long arg)
  84 {
  85         drm_i915_cmdbuffer32_t cmdbuffer32;
  86         drm_i915_cmdbuffer_t __user *cmdbuffer;
  87
  88         if (copy_from_user
  89             (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
  90                 return -EFAULT;
  91
  92         cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
  93         if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
  94             || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
  95                           &cmdbuffer->buf)
  96             || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
  97             || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
  98             || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
  99             || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
 100             || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
 101                           &cmdbuffer->cliprects))
 102                 return -EFAULT;
 103
 104         return drm_ioctl(file, DRM_IOCTL_I915_CMDBUFFER,
 105                          (unsigned long)cmdbuffer);
 106 }
 107
 108 typedef struct drm_i915_irq_emit32 {
 109         u32 irq_seq;
 110 } drm_i915_irq_emit32_t;
 111
 112 static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
 113                                 unsigned long arg)
 114 {
 115         drm_i915_irq_emit32_t req32;
 116         drm_i915_irq_emit_t __user *request;
 117
 118         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 119                 return -EFAULT;
 120
 121         request = compat_alloc_user_space(sizeof(*request));
 122         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 123             || __put_user((int __user *)(unsigned long)req32.irq_seq,
 124                           &request->irq_seq))
 125                 return -EFAULT;
 126
 127         return drm_ioctl(file, DRM_IOCTL_I915_IRQ_EMIT,
 128                          (unsigned long)request);
 129 }
 130 typedef struct drm_i915_getparam32 {
 131         int param;
 132         u32 value;
 133 } drm_i915_getparam32_t;
 134
 135 static int compat_i915_getparam(struct file *file, unsigned int cmd,
 136                                 unsigned long arg)
 137 {
 138         drm_i915_getparam32_t req32;
 139         drm_i915_getparam_t __user *request;
 140
 141         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 142                 return -EFAULT;
 143
 144         request = compat_alloc_user_space(sizeof(*request));
 145         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 146             || __put_user(req32.param, &request->param)
 147             || __put_user((void __user *)(unsigned long)req32.value,
 148                           &request->value))
 149                 return -EFAULT;
 150
 151         return drm_ioctl(file, DRM_IOCTL_I915_GETPARAM,
 152                          (unsigned long)request);
 153 }
 154
 155 typedef struct drm_i915_mem_alloc32 {
 156         int region;
 157         int alignment;
 158         int size;
 159         u32 region_offset;      /* offset from start of fb or agp */
 160 } drm_i915_mem_alloc32_t;
 161
 162 static int compat_i915_alloc(struct file *file, unsigned int cmd,
 163                              unsigned long arg)
 164 {
 165         drm_i915_mem_alloc32_t req32;
 166         drm_i915_mem_alloc_t __user *request;
 167
 168         if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
 169                 return -EFAULT;
 170
 171         request = compat_alloc_user_space(sizeof(*request));
 172         if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
 173             || __put_user(req32.region, &request->region)
 174             || __put_user(req32.alignment, &request->alignment)
 175             || __put_user(req32.size, &request->size)
 176             || __put_user((void __user *)(unsigned long)req32.region_offset,
 177                           &request->region_offset))
 178                 return -EFAULT;
 179
 180         return drm_ioctl(file, DRM_IOCTL_I915_ALLOC,
 181                          (unsigned long)request);
 182 }
 183
 184 static drm_ioctl_compat_t *i915_compat_ioctls[] = {
 185         [DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
 186         [DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
 187         [DRM_I915_GETPARAM] = compat_i915_getparam,
 188         [DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
 189         [DRM_I915_ALLOC] = compat_i915_alloc
 190 };
 191
 192 /**
 193  * Called whenever a 32-bit process running under a 64-bit kernel
 194  * performs an ioctl on /dev/dri/card<n>.
 195  *
 196  * \param filp file pointer.
 197  * \param cmd command.
 198  * \param arg user argument.
 199  * \return zero on success or negative number on failure.
 200  */
 201 long i915_compat_ioctl(struct file *filp, unsigned int cmd, 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 || nr >= DRM_COMMAND_END)
 208                 return drm_compat_ioctl(filp, cmd, arg);
 209
 210         if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls))
 211                 fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
 212
 213         if (fn != NULL)
 214                 ret = (*fn) (filp, cmd, arg);
 215         else
 216                 ret = drm_ioctl(filp, cmd, arg);
 217
 218         return ret;
 219 }