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