linux/drivers/char/agp/compat_ioctl.c
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   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 <asm/uaccess.h>
  35#include "agp.h"
  36#include "compat_ioctl.h"
  37
  38static 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
  61static 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(sizeof(*usegment) * ureserve.seg_count, GFP_KERNEL);
 102                if (!usegment)
 103                        return -ENOMEM;
 104
 105                ksegment = kmalloc(sizeof(*ksegment) * kreserve.seg_count, GFP_KERNEL);
 106                if (!ksegment) {
 107                        kfree(usegment);
 108                        return -ENOMEM;
 109                }
 110
 111                if (copy_from_user(usegment, (void __user *) ureserve.seg_list,
 112                                   sizeof(*usegment) * ureserve.seg_count)) {
 113                        kfree(usegment);
 114                        kfree(ksegment);
 115                        return -EFAULT;
 116                }
 117
 118                for (seg = 0; seg < ureserve.seg_count; seg++) {
 119                        ksegment[seg].pg_start = usegment[seg].pg_start;
 120                        ksegment[seg].pg_count = usegment[seg].pg_count;
 121                        ksegment[seg].prot = usegment[seg].prot;
 122                }
 123
 124                kfree(usegment);
 125                kreserve.seg_list = ksegment;
 126
 127                if (client == NULL) {
 128                        /* Create the client and add the segment */
 129                        client = agp_create_client(kreserve.pid);
 130
 131                        if (client == NULL) {
 132                                kfree(ksegment);
 133                                return -ENOMEM;
 134                        }
 135                        client_priv = agp_find_private(kreserve.pid);
 136
 137                        if (client_priv != NULL) {
 138                                set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
 139                                set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
 140                        }
 141                }
 142                return agp_create_segment(client, &kreserve);
 143        }
 144        /* Will never really happen */
 145        return -EINVAL;
 146}
 147
 148static int compat_agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
 149{
 150        struct agp_memory *memory;
 151        struct agp_allocate32 alloc;
 152
 153        DBG("");
 154        if (copy_from_user(&alloc, arg, sizeof(alloc)))
 155                return -EFAULT;
 156
 157        memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
 158
 159        if (memory == NULL)
 160                return -ENOMEM;
 161
 162        alloc.key = memory->key;
 163        alloc.physical = memory->physical;
 164
 165        if (copy_to_user(arg, &alloc, sizeof(alloc))) {
 166                agp_free_memory_wrap(memory);
 167                return -EFAULT;
 168        }
 169        return 0;
 170}
 171
 172static int compat_agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
 173{
 174        struct agp_bind32 bind_info;
 175        struct agp_memory *memory;
 176
 177        DBG("");
 178        if (copy_from_user(&bind_info, arg, sizeof(bind_info)))
 179                return -EFAULT;
 180
 181        memory = agp_find_mem_by_key(bind_info.key);
 182
 183        if (memory == NULL)
 184                return -EINVAL;
 185
 186        return agp_bind_memory(memory, bind_info.pg_start);
 187}
 188
 189static int compat_agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
 190{
 191        struct agp_memory *memory;
 192        struct agp_unbind32 unbind;
 193
 194        DBG("");
 195        if (copy_from_user(&unbind, arg, sizeof(unbind)))
 196                return -EFAULT;
 197
 198        memory = agp_find_mem_by_key(unbind.key);
 199
 200        if (memory == NULL)
 201                return -EINVAL;
 202
 203        return agp_unbind_memory(memory);
 204}
 205
 206long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 207{
 208        struct agp_file_private *curr_priv = file->private_data;
 209        int ret_val = -ENOTTY;
 210
 211        mutex_lock(&(agp_fe.agp_mutex));
 212
 213        if ((agp_fe.current_controller == NULL) &&
 214            (cmd != AGPIOC_ACQUIRE32)) {
 215                ret_val = -EINVAL;
 216                goto ioctl_out;
 217        }
 218        if ((agp_fe.backend_acquired != true) &&
 219            (cmd != AGPIOC_ACQUIRE32)) {
 220                ret_val = -EBUSY;
 221                goto ioctl_out;
 222        }
 223        if (cmd != AGPIOC_ACQUIRE32) {
 224                if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
 225                        ret_val = -EPERM;
 226                        goto ioctl_out;
 227                }
 228                /* Use the original pid of the controller,
 229                 * in case it's threaded */
 230
 231                if (agp_fe.current_controller->pid != curr_priv->my_pid) {
 232                        ret_val = -EBUSY;
 233                        goto ioctl_out;
 234                }
 235        }
 236
 237        switch (cmd) {
 238        case AGPIOC_INFO32:
 239                ret_val = compat_agpioc_info_wrap(curr_priv, (void __user *) arg);
 240                break;
 241
 242        case AGPIOC_ACQUIRE32:
 243                ret_val = agpioc_acquire_wrap(curr_priv);
 244                break;
 245
 246        case AGPIOC_RELEASE32:
 247                ret_val = agpioc_release_wrap(curr_priv);
 248                break;
 249
 250        case AGPIOC_SETUP32:
 251                ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
 252                break;
 253
 254        case AGPIOC_RESERVE32:
 255                ret_val = compat_agpioc_reserve_wrap(curr_priv, (void __user *) arg);
 256                break;
 257
 258        case AGPIOC_PROTECT32:
 259                ret_val = agpioc_protect_wrap(curr_priv);
 260                break;
 261
 262        case AGPIOC_ALLOCATE32:
 263                ret_val = compat_agpioc_allocate_wrap(curr_priv, (void __user *) arg);
 264                break;
 265
 266        case AGPIOC_DEALLOCATE32:
 267                ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
 268                break;
 269
 270        case AGPIOC_BIND32:
 271                ret_val = compat_agpioc_bind_wrap(curr_priv, (void __user *) arg);
 272                break;
 273
 274        case AGPIOC_UNBIND32:
 275                ret_val = compat_agpioc_unbind_wrap(curr_priv, (void __user *) arg);
 276                break;
 277
 278        case AGPIOC_CHIPSET_FLUSH32:
 279                break;
 280        }
 281
 282ioctl_out:
 283        DBG("ioctl returns %d\n", ret_val);
 284        mutex_unlock(&(agp_fe.agp_mutex));
 285        return ret_val;
 286}
 287
 288