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 <asm/uaccess.h>
  34 #include "agp.h"
  35 #include "compat_ioctl.h"
  36
  37 static int compat_agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
  38 {
  39         struct agp_info32 userinfo;
  40         struct agp_kern_info kerninfo;
  41
  42         agp_copy_info(agp_bridge, &kerninfo);
  43
  44         userinfo.version.major = kerninfo.version.major;
  45         userinfo.version.minor = kerninfo.version.minor;
  46         userinfo.bridge_id = kerninfo.device->vendor |
  47             (kerninfo.device->device << 16);
  48         userinfo.agp_mode = kerninfo.mode;
  49         userinfo.aper_base = (compat_long_t)kerninfo.aper_base;
  50         userinfo.aper_size = kerninfo.aper_size;
  51         userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
  52         userinfo.pg_used = kerninfo.current_memory;
  53
  54         if (copy_to_user(arg, &userinfo, sizeof(userinfo)))
  55                 return -EFAULT;
  56
  57         return 0;
  58 }
  59
  60 static int compat_agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
  61 {
  62         struct agp_region32 ureserve;
  63         struct agp_region kreserve;
  64         struct agp_client *client;
  65         struct agp_file_private *client_priv;
  66
  67         DBG("");
  68         if (copy_from_user(&ureserve, arg, sizeof(ureserve)))
  69                 return -EFAULT;
  70
  71         if ((unsigned) ureserve.seg_count >= ~0U/sizeof(struct agp_segment32))
  72                 return -EFAULT;
  73
  74         kreserve.pid = ureserve.pid;
  75         kreserve.seg_count = ureserve.seg_count;
  76
  77         client = agp_find_client_by_pid(kreserve.pid);
  78
  79         if (kreserve.seg_count == 0) {
  80                 /* remove a client */
  81                 client_priv = agp_find_private(kreserve.pid);
  82
  83                 if (client_priv != NULL) {
  84                         set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
  85                         set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
  86                 }
  87                 if (client == NULL) {
  88                         /* client is already removed */
  89                         return 0;
  90                 }
  91                 return agp_remove_client(kreserve.pid);
  92         } else {
  93                 struct agp_segment32 *usegment;
  94                 struct agp_segment *ksegment;
  95                 int seg;
  96
  97                 if (ureserve.seg_count >= 16384)
  98                         return -EINVAL;
  99
 100                 usegment = kmalloc(sizeof(*usegment) * ureserve.seg_count, GFP_KERNEL);
 101                 if (!usegment)
 102                         return -ENOMEM;
 103
 104                 ksegment = kmalloc(sizeof(*ksegment) * kreserve.seg_count, GFP_KERNEL);
 105                 if (!ksegment) {
 106                         kfree(usegment);
 107                         return -ENOMEM;
 108                 }
 109
 110                 if (copy_from_user(usegment, (void __user *) ureserve.seg_list,
 111                                    sizeof(*usegment) * ureserve.seg_count)) {
 112                         kfree(usegment);
 113                         kfree(ksegment);
 114                         return -EFAULT;
 115                 }
 116
 117                 for (seg = 0; seg < ureserve.seg_count; seg++) {
 118                         ksegment[seg].pg_start = usegment[seg].pg_start;
 119                         ksegment[seg].pg_count = usegment[seg].pg_count;
 120                         ksegment[seg].prot = usegment[seg].prot;
 121                 }
 122
 123                 kfree(usegment);
 124                 kreserve.seg_list = ksegment;
 125
 126                 if (client == NULL) {
 127                         /* Create the client and add the segment */
 128                         client = agp_create_client(kreserve.pid);
 129
 130                         if (client == NULL) {
 131                                 kfree(ksegment);
 132                                 return -ENOMEM;
 133                         }
 134                         client_priv = agp_find_private(kreserve.pid);
 135
 136                         if (client_priv != NULL) {
 137                                 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
 138                                 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
 139                         }
 140                 }
 141                 return agp_create_segment(client, &kreserve);
 142         }
 143         /* Will never really happen */
 144         return -EINVAL;
 145 }
 146
 147 static int compat_agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
 148 {
 149         struct agp_memory *memory;
 150         struct agp_allocate32 alloc;
 151
 152         DBG("");
 153         if (copy_from_user(&alloc, arg, sizeof(alloc)))
 154                 return -EFAULT;
 155
 156         memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
 157
 158         if (memory == NULL)
 159                 return -ENOMEM;
 160
 161         alloc.key = memory->key;
 162         alloc.physical = memory->physical;
 163
 164         if (copy_to_user(arg, &alloc, sizeof(alloc))) {
 165                 agp_free_memory_wrap(memory);
 166                 return -EFAULT;
 167         }
 168         return 0;
 169 }
 170
 171 static int compat_agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
 172 {
 173         struct agp_bind32 bind_info;
 174         struct agp_memory *memory;
 175
 176         DBG("");
 177         if (copy_from_user(&bind_info, arg, sizeof(bind_info)))
 178                 return -EFAULT;
 179
 180         memory = agp_find_mem_by_key(bind_info.key);
 181
 182         if (memory == NULL)
 183                 return -EINVAL;
 184
 185         return agp_bind_memory(memory, bind_info.pg_start);
 186 }
 187
 188 static int compat_agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
 189 {
 190         struct agp_memory *memory;
 191         struct agp_unbind32 unbind;
 192
 193         DBG("");
 194         if (copy_from_user(&unbind, arg, sizeof(unbind)))
 195                 return -EFAULT;
 196
 197         memory = agp_find_mem_by_key(unbind.key);
 198
 199         if (memory == NULL)
 200                 return -EINVAL;
 201
 202         return agp_unbind_memory(memory);
 203 }
 204
 205 long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 206 {
 207         struct agp_file_private *curr_priv = file->private_data;
 208         int ret_val = -ENOTTY;
 209
 210         mutex_lock(&(agp_fe.agp_mutex));
 211
 212         if ((agp_fe.current_controller == NULL) &&
 213             (cmd != AGPIOC_ACQUIRE32)) {
 214                 ret_val = -EINVAL;
 215                 goto ioctl_out;
 216         }
 217         if ((agp_fe.backend_acquired != TRUE) &&
 218             (cmd != AGPIOC_ACQUIRE32)) {
 219                 ret_val = -EBUSY;
 220                 goto ioctl_out;
 221         }
 222         if (cmd != AGPIOC_ACQUIRE32) {
 223                 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
 224                         ret_val = -EPERM;
 225                         goto ioctl_out;
 226                 }
 227                 /* Use the original pid of the controller,
 228                  * in case it's threaded */
 229
 230                 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
 231                         ret_val = -EBUSY;
 232                         goto ioctl_out;
 233                 }
 234         }
 235
 236         switch (cmd) {
 237         case AGPIOC_INFO32:
 238                 ret_val = compat_agpioc_info_wrap(curr_priv, (void __user *) arg);
 239                 break;
 240
 241         case AGPIOC_ACQUIRE32:
 242                 ret_val = agpioc_acquire_wrap(curr_priv);
 243                 break;
 244
 245         case AGPIOC_RELEASE32:
 246                 ret_val = agpioc_release_wrap(curr_priv);
 247                 break;
 248
 249         case AGPIOC_SETUP32:
 250                 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
 251                 break;
 252
 253         case AGPIOC_RESERVE32:
 254                 ret_val = compat_agpioc_reserve_wrap(curr_priv, (void __user *) arg);
 255                 break;
 256
 257         case AGPIOC_PROTECT32:
 258                 ret_val = agpioc_protect_wrap(curr_priv);
 259                 break;
 260
 261         case AGPIOC_ALLOCATE32:
 262                 ret_val = compat_agpioc_allocate_wrap(curr_priv, (void __user *) arg);
 263                 break;
 264
 265         case AGPIOC_DEALLOCATE32:
 266                 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
 267                 break;
 268
 269         case AGPIOC_BIND32:
 270                 ret_val = compat_agpioc_bind_wrap(curr_priv, (void __user *) arg);
 271                 break;
 272
 273         case AGPIOC_UNBIND32:
 274                 ret_val = compat_agpioc_unbind_wrap(curr_priv, (void __user *) arg);
 275                 break;
 276         }
 277
 278 ioctl_out:
 279         DBG("ioctl returns %d\n", ret_val);
 280         mutex_unlock(&(agp_fe.agp_mutex));
 281         return ret_val;
 282 }
 283