drivers/char/agp/compat_ioctl.c

   1 /*
   2  * AGPGART driver frontend compatibility ioctls
   3  * Copyright (C) 2004 Silicon Graphics, Inc.
   4  * Copyright (C) 2002-2003 Dave Jones
   5  * Copyright (C) 1999 Jeff Hartmann
   6  * Copyright (C) 1999 Precision Insight, Inc.
   7  * Copyright (C) 1999 Xi Graphics, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/pci.h>
  31 #include <linux/fs.h>
  32 #include <linux/agpgart.h>
  33 #include <linux/slab.h>
  34 #include <linux/uaccess.h>
  35 #include "agp.h"
  36 #include "compat_ioctl.h"
  37
  38 static int compat_agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
  39 {
  40         struct agp_info32 userinfo;
  41         struct agp_kern_info kerninfo;
  42
  43         agp_copy_info(agp_bridge, &kerninfo);
  44
  45         userinfo.version.major = kerninfo.version.major;
  46         userinfo.version.minor = kerninfo.version.minor;
  47         userinfo.bridge_id = kerninfo.device->vendor |
  48             (kerninfo.device->device << 16);
  49         userinfo.agp_mode = kerninfo.mode;
  50         userinfo.aper_base = (compat_long_t)kerninfo.aper_base;
  51         userinfo.aper_size = kerninfo.aper_size;
  52         userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
  53         userinfo.pg_used = kerninfo.current_memory;
  54
  55         if (copy_to_user(arg, &userinfo, sizeof(userinfo)))
  56                 return -EFAULT;
  57
  58         return 0;
  59 }
  60
  61 static int compat_agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
  62 {
  63         struct agp_region32 ureserve;
  64         struct agp_region kreserve;
  65         struct agp_client *client;
  66         struct agp_file_private *client_priv;
  67
  68         DBG("");
  69         if (copy_from_user(&ureserve, arg, sizeof(ureserve)))
  70                 return -EFAULT;
  71
  72         if ((unsigned) ureserve.seg_count >= ~0U/sizeof(struct agp_segment32))
  73                 return -EFAULT;
  74
  75         kreserve.pid = ureserve.pid;
  76         kreserve.seg_count = ureserve.seg_count;
  77
  78         client = agp_find_client_by_pid(kreserve.pid);
  79
  80         if (kreserve.seg_count == 0) {
  81                 /* remove a client */
  82                 client_priv = agp_find_private(kreserve.pid);
  83
  84                 if (client_priv != NULL) {
  85                         set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
  86                         set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
  87                 }
  88                 if (client == NULL) {
  89                         /* client is already removed */
  90                         return 0;
  91                 }
  92                 return agp_remove_client(kreserve.pid);
  93         } else {
  94                 struct agp_segment32 *usegment;
  95                 struct agp_segment *ksegment;
  96                 int seg;
  97
  98                 if (ureserve.seg_count >= 16384)
  99                         return -EINVAL;
 100
 101                 usegment = kmalloc_array(ureserve.seg_count,
 102                                          sizeof(*usegment),
 103                                          GFP_KERNEL);
 104                 if (!usegment)
 105                         return -ENOMEM;
 106
 107                 ksegment = kmalloc_array(kreserve.seg_count,
 108                                          sizeof(*ksegment),
 109                                          GFP_KERNEL);
 110                 if (!ksegment) {
 111                         kfree(usegment);
 112                         return -ENOMEM;
 113                 }
 114
 115                 if (copy_from_user(usegment, (void __user *) ureserve.seg_list,
 116                                    sizeof(*usegment) * ureserve.seg_count)) {
 117                         kfree(usegment);
 118                         kfree(ksegment);
 119                         return -EFAULT;
 120                 }
 121
 122                 for (seg = 0; seg < ureserve.seg_count; seg++) {
 123                         ksegment[seg].pg_start = usegment[seg].pg_start;
 124                         ksegment[seg].pg_count = usegment[seg].pg_count;
 125                         ksegment[seg].prot = usegment[seg].prot;
 126                 }
 127
 128                 kfree(usegment);
 129                 kreserve.seg_list = ksegment;
 130
 131                 if (client == NULL) {
 132                         /* Create the client and add the segment */
 133                         client = agp_create_client(kreserve.pid);
 134
 135                         if (client == NULL) {
 136                                 kfree(ksegment);
 137                                 return -ENOMEM;
 138                         }
 139                         client_priv = agp_find_private(kreserve.pid);
 140
 141                         if (client_priv != NULL) {
 142                                 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
 143                                 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
 144                         }
 145                 }
 146                 return agp_create_segment(client, &kreserve);
 147         }
 148         /* Will never really happen */
 149         return -EINVAL;
 150 }
 151
 152 static int compat_agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
 153 {
 154         struct agp_memory *memory;
 155         struct agp_allocate32 alloc;
 156
 157         DBG("");
 158         if (copy_from_user(&alloc, arg, sizeof(alloc)))
 159                 return -EFAULT;
 160
 161         memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
 162
 163         if (memory == NULL)
 164                 return -ENOMEM;
 165
 166         alloc.key = memory->key;
 167         alloc.physical = memory->physical;
 168
 169         if (copy_to_user(arg, &alloc, sizeof(alloc))) {
 170                 agp_free_memory_wrap(memory);
 171                 return -EFAULT;
 172         }
 173         return 0;
 174 }
 175
 176 static int compat_agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
 177 {
 178         struct agp_bind32 bind_info;
 179         struct agp_memory *memory;
 180
 181         DBG("");
 182         if (copy_from_user(&bind_info, arg, sizeof(bind_info)))
 183                 return -EFAULT;
 184
 185         memory = agp_find_mem_by_key(bind_info.key);
 186
 187         if (memory == NULL)
 188                 return -EINVAL;
 189
 190         return agp_bind_memory(memory, bind_info.pg_start);
 191 }
 192
 193 static int compat_agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
 194 {
 195         struct agp_memory *memory;
 196         struct agp_unbind32 unbind;
 197
 198         DBG("");
 199         if (copy_from_user(&unbind, arg, sizeof(unbind)))
 200                 return -EFAULT;
 201
 202         memory = agp_find_mem_by_key(unbind.key);
 203
 204         if (memory == NULL)
 205                 return -EINVAL;
 206
 207         return agp_unbind_memory(memory);
 208 }
 209
 210 long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 211 {
 212         struct agp_file_private *curr_priv = file->private_data;
 213         int ret_val = -ENOTTY;
 214
 215         mutex_lock(&(agp_fe.agp_mutex));
 216
 217         if ((agp_fe.current_controller == NULL) &&
 218             (cmd != AGPIOC_ACQUIRE32)) {
 219                 ret_val = -EINVAL;
 220                 goto ioctl_out;
 221         }
 222         if ((agp_fe.backend_acquired != true) &&
 223             (cmd != AGPIOC_ACQUIRE32)) {
 224                 ret_val = -EBUSY;
 225                 goto ioctl_out;
 226         }
 227         if (cmd != AGPIOC_ACQUIRE32) {
 228                 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
 229                         ret_val = -EPERM;
 230                         goto ioctl_out;
 231                 }
 232                 /* Use the original pid of the controller,
 233                  * in case it's threaded */
 234
 235                 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
 236                         ret_val = -EBUSY;
 237                         goto ioctl_out;
 238                 }
 239         }
 240
 241         switch (cmd) {
 242         case AGPIOC_INFO32:
 243                 ret_val = compat_agpioc_info_wrap(curr_priv, (void __user *) arg);
 244                 break;
 245
 246         case AGPIOC_ACQUIRE32:
 247                 ret_val = agpioc_acquire_wrap(curr_priv);
 248                 break;
 249
 250         case AGPIOC_RELEASE32:
 251                 ret_val = agpioc_release_wrap(curr_priv);
 252                 break;
 253
 254         case AGPIOC_SETUP32:
 255                 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
 256                 break;
 257
 258         case AGPIOC_RESERVE32:
 259                 ret_val = compat_agpioc_reserve_wrap(curr_priv, (void __user *) arg);
 260                 break;
 261
 262         case AGPIOC_PROTECT32:
 263                 ret_val = agpioc_protect_wrap(curr_priv);
 264                 break;
 265
 266         case AGPIOC_ALLOCATE32:
 267                 ret_val = compat_agpioc_allocate_wrap(curr_priv, (void __user *) arg);
 268                 break;
 269
 270         case AGPIOC_DEALLOCATE32:
 271                 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
 272                 break;
 273
 274         case AGPIOC_BIND32:
 275                 ret_val = compat_agpioc_bind_wrap(curr_priv, (void __user *) arg);
 276                 break;
 277
 278         case AGPIOC_UNBIND32:
 279                 ret_val = compat_agpioc_unbind_wrap(curr_priv, (void __user *) arg);
 280                 break;
 281
 282         case AGPIOC_CHIPSET_FLUSH32:
 283                 break;
 284         }
 285
 286 ioctl_out:
 287         DBG("ioctl returns %d\n", ret_val);
 288         mutex_unlock(&(agp_fe.agp_mutex));
 289         return ret_val;
 290 }
 291