LXR linux/drivers/gpu/drm/drm

   1/**
   2 * \file drm_drv.c
   3 * Generic driver template
   4 *
   5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6 * \author Gareth Hughes <gareth@valinux.com>
   7 *
   8 * To use this template, you must at least define the following (samples
   9 * given for the MGA driver):
  10 *
  11 * \code
  12 * #define DRIVER_AUTHOR        "VA Linux Systems, Inc."
  13 *
  14 * #define DRIVER_NAME          "mga"
  15 * #define DRIVER_DESC          "Matrox G200/G400"
  16 * #define DRIVER_DATE          "20001127"
  17 *
  18 * #define drm_x                mga_##x
  19 * \endcode
  20 */
  21
  22/*
  23 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
  24 *
  25 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  26 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  27 * All Rights Reserved.
  28 *
  29 * Permission is hereby granted, free of charge, to any person obtaining a
  30 * copy of this software and associated documentation files (the "Software"),
  31 * to deal in the Software without restriction, including without limitation
  32 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  33 * and/or sell copies of the Software, and to permit persons to whom the
  34 * Software is furnished to do so, subject to the following conditions:
  35 *
  36 * The above copyright notice and this permission notice (including the next
  37 * paragraph) shall be included in all copies or substantial portions of the
  38 * Software.
  39 *
  40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  43 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  46 * OTHER DEALINGS IN THE SOFTWARE.
  47 */
  48
  49#include <linux/debugfs.h>
  50#include <linux/slab.h>
  51#include <linux/export.h>
  52#include <drm/drmP.h>
  53#include <drm/drm_core.h>
  54
  55
  56static int drm_version(struct drm_device *dev, void *data,
  57                       struct drm_file *file_priv);
  58
  59#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
  60        [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
  61
  62/** Ioctl table */
  63static const struct drm_ioctl_desc drm_ioctls[] = {
  64        DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW),
  65        DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
  66        DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
  67        DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
  68        DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
  69        DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
  70        DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
  71        DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
  72        DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
  73        DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
  74
  75        DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  76        DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  77        DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  78        DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
  79
  80        DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  81        DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
  82
  83        DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  84        DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
  85
  86        DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
  87        DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
  88
  89        DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
  90        DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  91        DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  92        DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
  93        DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  94        DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  95        DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
  96
  97        DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  98        DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  99
 100        DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
 101        DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
 102
 103        DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
 104
 105        DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 106        DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 107        DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
 108        DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
 109        DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
 110        DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, DRM_AUTH),
 111
 112        DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 113
 114#if __OS_HAS_AGP
 115        DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 116        DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 117        DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 118        DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 119        DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 120        DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 121        DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 122        DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 123#endif
 124
 125        DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 126        DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 127
 128        DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
 129
 130        DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 131
 132        DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 133
 134        DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 135        DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
 136        DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
 137
 138        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 139
 140        DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 141        DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 142
 143        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 144        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 145        DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 146        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 147        DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 148        DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 149        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
 150        DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
 151        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 152        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 153        DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 154        DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 155        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 156        DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 157        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 158        DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 159        DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 160        DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 161        DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 162        DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 163        DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 164        DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 165        DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 166        DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 167        DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 168        DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 169        DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 170};
 171
 172#define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 173
 174/** File operations structure */
 175static const struct file_operations drm_stub_fops = {
 176        .owner = THIS_MODULE,
 177        .open = drm_stub_open,
 178        .llseek = noop_llseek,
 179};
 180
 181static int __init drm_core_init(void)
 182{
 183        int ret = -ENOMEM;
 184
 185        drm_global_init();
 186        drm_connector_ida_init();
 187        idr_init(&drm_minors_idr);
 188
 189        if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 190                goto err_p1;
 191
 192        drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 193        if (IS_ERR(drm_class)) {
 194                printk(KERN_ERR "DRM: Error creating drm class.\n");
 195                ret = PTR_ERR(drm_class);
 196                goto err_p2;
 197        }
 198
 199        drm_debugfs_root = debugfs_create_dir("dri", NULL);
 200        if (!drm_debugfs_root) {
 201                DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
 202                ret = -1;
 203                goto err_p3;
 204        }
 205
 206        DRM_INFO("Initialized %s %d.%d.%d %s\n",
 207                 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 208        return 0;
 209err_p3:
 210        drm_sysfs_destroy();
 211err_p2:
 212        unregister_chrdev(DRM_MAJOR, "drm");
 213
 214        idr_destroy(&drm_minors_idr);
 215err_p1:
 216        return ret;
 217}
 218
 219static void __exit drm_core_exit(void)
 220{
 221        debugfs_remove(drm_debugfs_root);
 222        drm_sysfs_destroy();
 223
 224        unregister_chrdev(DRM_MAJOR, "drm");
 225
 226        drm_connector_ida_destroy();
 227        idr_destroy(&drm_minors_idr);
 228}
 229
 230module_init(drm_core_init);
 231module_exit(drm_core_exit);
 232
 233/**
 234 * Copy and IOCTL return string to user space
 235 */
 236static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
 237{
 238        int len;
 239
 240        /* don't overflow userbuf */
 241        len = strlen(value);
 242        if (len > *buf_len)
 243                len = *buf_len;
 244
 245        /* let userspace know exact length of driver value (which could be
 246         * larger than the userspace-supplied buffer) */
 247        *buf_len = strlen(value);
 248
 249        /* finally, try filling in the userbuf */
 250        if (len && buf)
 251                if (copy_to_user(buf, value, len))
 252                        return -EFAULT;
 253        return 0;
 254}
 255
 256/**
 257 * Get version information
 258 *
 259 * \param inode device inode.
 260 * \param filp file pointer.
 261 * \param cmd command.
 262 * \param arg user argument, pointing to a drm_version structure.
 263 * \return zero on success or negative number on failure.
 264 *
 265 * Fills in the version information in \p arg.
 266 */
 267static int drm_version(struct drm_device *dev, void *data,
 268                       struct drm_file *file_priv)
 269{
 270        struct drm_version *version = data;
 271        int err;
 272
 273        version->version_major = dev->driver->major;
 274        version->version_minor = dev->driver->minor;
 275        version->version_patchlevel = dev->driver->patchlevel;
 276        err = drm_copy_field(version->name, &version->name_len,
 277                        dev->driver->name);
 278        if (!err)
 279                err = drm_copy_field(version->date, &version->date_len,
 280                                dev->driver->date);
 281        if (!err)
 282                err = drm_copy_field(version->desc, &version->desc_len,
 283                                dev->driver->desc);
 284
 285        return err;
 286}
 287
 288/**
 289 * drm_ioctl_permit - Check ioctl permissions against caller
 290 *
 291 * @flags: ioctl permission flags.
 292 * @file_priv: Pointer to struct drm_file identifying the caller.
 293 *
 294 * Checks whether the caller is allowed to run an ioctl with the
 295 * indicated permissions. If so, returns zero. Otherwise returns an
 296 * error code suitable for ioctl return.
 297 */
 298static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 299{
 300        /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 301        if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 302                return -EACCES;
 303
 304        /* AUTH is only for authenticated or render client */
 305        if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
 306                     !file_priv->authenticated))
 307                return -EACCES;
 308
 309        /* MASTER is only for master or control clients */
 310        if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
 311                     !drm_is_control_client(file_priv)))
 312                return -EACCES;
 313
 314        /* Control clients must be explicitly allowed */
 315        if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
 316                     drm_is_control_client(file_priv)))
 317                return -EACCES;
 318
 319        /* Render clients must be explicitly allowed */
 320        if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
 321                     drm_is_render_client(file_priv)))
 322                return -EACCES;
 323
 324        return 0;
 325}
 326
 327/**
 328 * Called whenever a process performs an ioctl on /dev/drm.
 329 *
 330 * \param inode device inode.
 331 * \param file_priv DRM file private.
 332 * \param cmd command.
 333 * \param arg user argument.
 334 * \return zero on success or negative number on failure.
 335 *
 336 * Looks up the ioctl function in the ::ioctls table, checking for root
 337 * previleges if so required, and dispatches to the respective function.
 338 */
 339long drm_ioctl(struct file *filp,
 340              unsigned int cmd, unsigned long arg)
 341{
 342        struct drm_file *file_priv = filp->private_data;
 343        struct drm_device *dev;
 344        const struct drm_ioctl_desc *ioctl = NULL;
 345        drm_ioctl_t *func;
 346        unsigned int nr = DRM_IOCTL_NR(cmd);
 347        int retcode = -EINVAL;
 348        char stack_kdata[128];
 349        char *kdata = NULL;
 350        unsigned int usize, asize;
 351
 352        dev = file_priv->minor->dev;
 353
 354        if (drm_device_is_unplugged(dev))
 355                return -ENODEV;
 356
 357        if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 358            ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 359                goto err_i1;
 360        if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 361            (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
 362                u32 drv_size;
 363                ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 364                drv_size = _IOC_SIZE(ioctl->cmd_drv);
 365                usize = asize = _IOC_SIZE(cmd);
 366                if (drv_size > asize)
 367                        asize = drv_size;
 368                cmd = ioctl->cmd_drv;
 369        }
 370        else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
 371                u32 drv_size;
 372
 373                ioctl = &drm_ioctls[nr];
 374
 375                drv_size = _IOC_SIZE(ioctl->cmd);
 376                usize = asize = _IOC_SIZE(cmd);
 377                if (drv_size > asize)
 378                        asize = drv_size;
 379
 380                cmd = ioctl->cmd;
 381        } else
 382                goto err_i1;
 383
 384        DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
 385                  task_pid_nr(current),
 386                  (long)old_encode_dev(file_priv->minor->kdev->devt),
 387                  file_priv->authenticated, ioctl->name);
 388
 389        /* Do not trust userspace, use our own definition */
 390        func = ioctl->func;
 391
 392        if (unlikely(!func)) {
 393                DRM_DEBUG("no function\n");
 394                retcode = -EINVAL;
 395                goto err_i1;
 396        }
 397
 398        retcode = drm_ioctl_permit(ioctl->flags, file_priv);
 399        if (unlikely(retcode))
 400                goto err_i1;
 401
 402        if (cmd & (IOC_IN | IOC_OUT)) {
 403                if (asize <= sizeof(stack_kdata)) {
 404                        kdata = stack_kdata;
 405                } else {
 406                        kdata = kmalloc(asize, GFP_KERNEL);
 407                        if (!kdata) {
 408                                retcode = -ENOMEM;
 409                                goto err_i1;
 410                        }
 411                }
 412                if (asize > usize)
 413                        memset(kdata + usize, 0, asize - usize);
 414        }
 415
 416        if (cmd & IOC_IN) {
 417                if (copy_from_user(kdata, (void __user *)arg,
 418                                   usize) != 0) {
 419                        retcode = -EFAULT;
 420                        goto err_i1;
 421                }
 422        } else if (cmd & IOC_OUT) {
 423                memset(kdata, 0, usize);
 424        }
 425
 426        if (ioctl->flags & DRM_UNLOCKED)
 427                retcode = func(dev, kdata, file_priv);
 428        else {
 429                mutex_lock(&drm_global_mutex);
 430                retcode = func(dev, kdata, file_priv);
 431                mutex_unlock(&drm_global_mutex);
 432        }
 433
 434        if (cmd & IOC_OUT) {
 435                if (copy_to_user((void __user *)arg, kdata,
 436                                 usize) != 0)
 437                        retcode = -EFAULT;
 438        }
 439
 440      err_i1:
 441        if (!ioctl)
 442                DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
 443                          task_pid_nr(current),
 444                          (long)old_encode_dev(file_priv->minor->kdev->devt),
 445                          file_priv->authenticated, cmd, nr);
 446
 447        if (kdata != stack_kdata)
 448                kfree(kdata);
 449        if (retcode)
 450                DRM_DEBUG("ret = %d\n", retcode);
 451        return retcode;
 452}
 453EXPORT_SYMBOL(drm_ioctl);
 454
 455/**
 456 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 457 *
 458 * @nr: Ioctl number.
 459 * @flags: Where to return the ioctl permission flags
 460 */
 461bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 462{
 463        if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||
 464            (nr < DRM_COMMAND_BASE)) {
 465                *flags = drm_ioctls[nr].flags;
 466                return true;
 467        }
 468
 469        return false;
 470}
 471EXPORT_SYMBOL(drm_ioctl_flags);
 472