drivers/char/drm/i810_drv.c

   1 /* i810_drv.c -- I810 driver -*- linux-c -*-
   2  * Created: Mon Dec 13 01:56:22 1999 by jhartmann@precisioninsight.com
   3  *
   4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the next
  16  * paragraph) shall be included in all copies or substantial portions of the
  17  * Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25  * DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors: Rickard E. (Rik) Faith <faith@valinux.com>
  28  *          Jeff Hartmann <jhartmann@valinux.com>
  29  *
  30  */
  31
  32 #include <linux/config.h>
  33 #include "drmP.h"
  34 #include "i810_drv.h"
  35
  36 #define I810_NAME        "i810"
  37 #define I810_DESC        "Intel I810"
  38 #define I810_DATE        "20000719"
  39 #define I810_MAJOR       1
  40 #define I810_MINOR       1
  41 #define I810_PATCHLEVEL  0
  42
  43 static drm_device_t           i810_device;
  44 drm_ctx_t                     i810_res_ctx;
  45
  46 static struct file_operations i810_fops = {
  47 #if LINUX_VERSION_CODE >= 0x020400
  48                                 /* This started being used during 2.4.0-test */
  49         owner:   THIS_MODULE,
  50 #endif
  51         open:    i810_open,
  52         flush:   drm_flush,
  53         release: i810_release,
  54         ioctl:   i810_ioctl,
  55         mmap:    drm_mmap,
  56         read:    drm_read,
  57         fasync:  drm_fasync,
  58         poll:    drm_poll,
  59 };
  60
  61 static struct miscdevice      i810_misc = {
  62         minor: MISC_DYNAMIC_MINOR,
  63         name:  I810_NAME,
  64         fops:  &i810_fops,
  65 };
  66
  67 static drm_ioctl_desc_t       i810_ioctls[] = {
  68         [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]     = { i810_version,   0, 0 },
  69         [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)]  = { drm_getunique,  0, 0 },
  70         [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]   = { drm_getmagic,   0, 0 },
  71         [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]   = { drm_irq_busid,  0, 1 },
  72
  73         [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)]  = { drm_setunique,  1, 1 },
  74         [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]       = { drm_block,      1, 1 },
  75         [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]     = { drm_unblock,    1, 1 },
  76         [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]     = { i810_control,   1, 1 },
  77         [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)]  = { drm_authmagic,  1, 1 },
  78         [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]     = { drm_addmap,     1, 1 },
  79         [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]    = { i810_addbufs,   1, 1 },
  80         [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]   = { i810_markbufs,  1, 1 },
  81         [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]   = { i810_infobufs,  1, 0 },
  82         [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]   = { i810_freebufs,  1, 0 },
  83
  84         [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]     = { i810_addctx,    1, 1 },
  85         [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]      = { i810_rmctx,     1, 1 },
  86         [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]     = { i810_modctx,    1, 1 },
  87         [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]     = { i810_getctx,    1, 0 },
  88         [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)]  = { i810_switchctx,  1, 1 },
  89         [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]     = { i810_newctx,    1, 1 },
  90         [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]     = { i810_resctx,    1, 0 },
  91         [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]    = { drm_adddraw,    1, 1 },
  92         [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]     = { drm_rmdraw,     1, 1 },
  93
  94         [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]        = { i810_lock,      1, 0 },
  95         [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]      = { i810_unlock,    1, 0 },
  96         [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]      = { drm_finish,     1, 0 },
  97
  98         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = { drm_agp_acquire, 1, 1 },
  99         [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = { drm_agp_release, 1, 1 },
 100         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]  = { drm_agp_enable,  1, 1 },
 101         [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]    = { drm_agp_info,    1, 0 },
 102         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]   = { drm_agp_alloc,   1, 1 },
 103         [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]    = { drm_agp_free,    1, 1 },
 104         [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]    = { drm_agp_bind,    1, 1 },
 105         [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]  = { drm_agp_unbind,  1, 1 },
 106
 107         [DRM_IOCTL_NR(DRM_IOCTL_I810_INIT)]   = { i810_dma_init,   1, 1 },
 108         [DRM_IOCTL_NR(DRM_IOCTL_I810_VERTEX)] = { i810_dma_vertex, 1, 0 },
 109         [DRM_IOCTL_NR(DRM_IOCTL_I810_CLEAR)]  = { i810_clear_bufs, 1, 0 },
 110         [DRM_IOCTL_NR(DRM_IOCTL_I810_FLUSH)]  = { i810_flush_ioctl,1, 0 },
 111         [DRM_IOCTL_NR(DRM_IOCTL_I810_GETAGE)] = { i810_getage,     1, 0 },
 112         [DRM_IOCTL_NR(DRM_IOCTL_I810_GETBUF)] = { i810_getbuf,     1, 0 },
 113         [DRM_IOCTL_NR(DRM_IOCTL_I810_SWAP)]   = { i810_swap_bufs,  1, 0 },
 114         [DRM_IOCTL_NR(DRM_IOCTL_I810_COPY)]   = { i810_copybuf,    1, 0 },
 115         [DRM_IOCTL_NR(DRM_IOCTL_I810_DOCOPY)] = { i810_docopy,     1, 0 },
 116 };
 117
 118 #define I810_IOCTL_COUNT DRM_ARRAY_SIZE(i810_ioctls)
 119
 120 #ifdef MODULE
 121 static char                   *i810 = NULL;
 122 #endif
 123
 124 MODULE_AUTHOR("VA Linux Systems, Inc.");
 125 MODULE_DESCRIPTION("Intel I810");
 126 MODULE_PARM(i810, "s");
 127
 128 #ifndef MODULE
 129 /* i810_options is called by the kernel to parse command-line options
 130  * passed via the boot-loader (e.g., LILO).  It calls the insmod option
 131  * routine, drm_parse_drm.
 132  */
 133
 134 static int __init i810_options(char *str)
 135 {
 136         drm_parse_options(str);
 137         return 1;
 138 }
 139
 140 __setup("i810=", i810_options);
 141 #endif
 142
 143 static int i810_setup(drm_device_t *dev)
 144 {
 145         int i;
 146
 147         atomic_set(&dev->ioctl_count, 0);
 148         atomic_set(&dev->vma_count, 0);
 149         dev->buf_use      = 0;
 150         atomic_set(&dev->buf_alloc, 0);
 151
 152         drm_dma_setup(dev);
 153
 154         atomic_set(&dev->total_open, 0);
 155         atomic_set(&dev->total_close, 0);
 156         atomic_set(&dev->total_ioctl, 0);
 157         atomic_set(&dev->total_irq, 0);
 158         atomic_set(&dev->total_ctx, 0);
 159         atomic_set(&dev->total_locks, 0);
 160         atomic_set(&dev->total_unlocks, 0);
 161         atomic_set(&dev->total_contends, 0);
 162         atomic_set(&dev->total_sleeps, 0);
 163
 164         for (i = 0; i < DRM_HASH_SIZE; i++) {
 165                 dev->magiclist[i].head = NULL;
 166                 dev->magiclist[i].tail = NULL;
 167         }
 168         dev->maplist        = NULL;
 169         dev->map_count      = 0;
 170         dev->vmalist        = NULL;
 171         dev->lock.hw_lock   = NULL;
 172         init_waitqueue_head(&dev->lock.lock_queue);
 173         dev->queue_count    = 0;
 174         dev->queue_reserved = 0;
 175         dev->queue_slots    = 0;
 176         dev->queuelist      = NULL;
 177         dev->irq            = 0;
 178         dev->context_flag   = 0;
 179         dev->interrupt_flag = 0;
 180         dev->dma_flag       = 0;
 181         dev->last_context   = 0;
 182         dev->last_switch    = 0;
 183         dev->last_checked   = 0;
 184         init_timer(&dev->timer);
 185         init_waitqueue_head(&dev->context_wait);
 186 #if DRM_DMA_HISTO
 187         memset(&dev->histo, 0, sizeof(dev->histo));
 188 #endif
 189         dev->ctx_start      = 0;
 190         dev->lck_start      = 0;
 191
 192         dev->buf_rp       = dev->buf;
 193         dev->buf_wp       = dev->buf;
 194         dev->buf_end      = dev->buf + DRM_BSZ;
 195         dev->buf_async    = NULL;
 196         init_waitqueue_head(&dev->buf_readers);
 197         init_waitqueue_head(&dev->buf_writers);
 198
 199         DRM_DEBUG("\n");
 200
 201         /* The kernel's context could be created here, but is now created
 202            in drm_dma_enqueue.  This is more resource-efficient for
 203            hardware that does not do DMA, but may mean that
 204            drm_select_queue fails between the time the interrupt is
 205            initialized and the time the queues are initialized. */
 206
 207         return 0;
 208 }
 209
 210
 211 static int i810_takedown(drm_device_t *dev)
 212 {
 213         int               i;
 214         drm_magic_entry_t *pt, *next;
 215         drm_map_t         *map;
 216         drm_vma_entry_t   *vma, *vma_next;
 217
 218         DRM_DEBUG("\n");
 219
 220         if (dev->irq) i810_irq_uninstall(dev);
 221
 222         down(&dev->struct_sem);
 223         del_timer(&dev->timer);
 224
 225         if (dev->devname) {
 226                 drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
 227                 dev->devname = NULL;
 228         }
 229
 230         if (dev->unique) {
 231                 drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
 232                 dev->unique = NULL;
 233                 dev->unique_len = 0;
 234         }
 235                                 /* Clear pid list */
 236         for (i = 0; i < DRM_HASH_SIZE; i++) {
 237                 for (pt = dev->magiclist[i].head; pt; pt = next) {
 238                         next = pt->next;
 239                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 240                 }
 241                 dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
 242         }
 243                                 /* Clear AGP information */
 244         if (dev->agp) {
 245                 drm_agp_mem_t *entry;
 246                 drm_agp_mem_t *nexte;
 247
 248                                 /* Remove AGP resources, but leave dev->agp
 249                                    intact until r128_cleanup is called. */
 250                 for (entry = dev->agp->memory; entry; entry = nexte) {
 251                         nexte = entry->next;
 252                         if (entry->bound) drm_unbind_agp(entry->memory);
 253                         drm_free_agp(entry->memory, entry->pages);
 254                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 255                 }
 256                 dev->agp->memory = NULL;
 257
 258                 if (dev->agp->acquired && drm_agp.release)
 259                         (*drm_agp.release)();
 260
 261                 dev->agp->acquired = 0;
 262                 dev->agp->enabled  = 0;
 263         }
 264                                 /* Clear vma list (only built for debugging) */
 265         if (dev->vmalist) {
 266                 for (vma = dev->vmalist; vma; vma = vma_next) {
 267                         vma_next = vma->next;
 268                         drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 269                 }
 270                 dev->vmalist = NULL;
 271         }
 272
 273                                 /* Clear map area and mtrr information */
 274         if (dev->maplist) {
 275                 for (i = 0; i < dev->map_count; i++) {
 276                         map = dev->maplist[i];
 277                         switch (map->type) {
 278                         case _DRM_REGISTERS:
 279                         case _DRM_FRAME_BUFFER:
 280 #ifdef CONFIG_MTRR
 281                                 if (map->mtrr >= 0) {
 282                                         int retcode;
 283                                         retcode = mtrr_del(map->mtrr,
 284                                                            map->offset,
 285                                                            map->size);
 286                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 287                                 }
 288 #endif
 289                                 drm_ioremapfree(map->handle, map->size);
 290                                 break;
 291                         case _DRM_SHM:
 292                                 drm_free_pages((unsigned long)map->handle,
 293                                                drm_order(map->size)
 294                                                - PAGE_SHIFT,
 295                                                DRM_MEM_SAREA);
 296                                 break;
 297                         case _DRM_AGP:
 298                                 break;
 299                         }
 300                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 301                 }
 302                 drm_free(dev->maplist,
 303                          dev->map_count * sizeof(*dev->maplist),
 304                          DRM_MEM_MAPS);
 305                 dev->maplist   = NULL;
 306                 dev->map_count = 0;
 307         }
 308
 309         if (dev->queuelist) {
 310                 for (i = 0; i < dev->queue_count; i++) {
 311                         drm_waitlist_destroy(&dev->queuelist[i]->waitlist);
 312                         if (dev->queuelist[i]) {
 313                                 drm_free(dev->queuelist[i],
 314                                          sizeof(*dev->queuelist[0]),
 315                                          DRM_MEM_QUEUES);
 316                                 dev->queuelist[i] = NULL;
 317                         }
 318                 }
 319                 drm_free(dev->queuelist,
 320                          dev->queue_slots * sizeof(*dev->queuelist),
 321                          DRM_MEM_QUEUES);
 322                 dev->queuelist   = NULL;
 323         }
 324
 325         drm_dma_takedown(dev);
 326
 327         dev->queue_count     = 0;
 328         if (dev->lock.hw_lock) {
 329                 dev->lock.hw_lock    = NULL; /* SHM removed */
 330                 dev->lock.pid        = 0;
 331                 wake_up_interruptible(&dev->lock.lock_queue);
 332         }
 333         up(&dev->struct_sem);
 334
 335         return 0;
 336 }
 337
 338 /* i810_init is called via init_module at module load time, or via
 339  * linux/init/main.c (this is not currently supported). */
 340
 341 static int i810_init(void)
 342 {
 343         int                   retcode;
 344         drm_device_t          *dev = &i810_device;
 345
 346         DRM_DEBUG("\n");
 347
 348         memset((void *)dev, 0, sizeof(*dev));
 349         dev->count_lock   = SPIN_LOCK_UNLOCKED;
 350         sema_init(&dev->struct_sem, 1);
 351
 352 #ifdef MODULE
 353         drm_parse_options(i810);
 354 #endif
 355         DRM_DEBUG("doing misc_register\n");
 356         if ((retcode = misc_register(&i810_misc))) {
 357                 DRM_ERROR("Cannot register \"%s\"\n", I810_NAME);
 358                 return retcode;
 359         }
 360         dev->device = MKDEV(MISC_MAJOR, i810_misc.minor);
 361         dev->name   = I810_NAME;
 362
 363         DRM_DEBUG("doing mem init\n");
 364         drm_mem_init();
 365         DRM_DEBUG("doing proc init\n");
 366         drm_proc_init(dev);
 367         DRM_DEBUG("doing agp init\n");
 368         dev->agp    = drm_agp_init();
 369         if(dev->agp == NULL) {
 370                 DRM_INFO("The i810 drm module requires the agpgart module"
 371                          " to function correctly\nPlease load the agpgart"
 372                          " module before you load the i810 module\n");
 373                 drm_proc_cleanup();
 374                 misc_deregister(&i810_misc);
 375                 i810_takedown(dev);
 376                 return -ENOMEM;
 377         }
 378         DRM_DEBUG("doing ctxbitmap init\n");
 379         if((retcode = drm_ctxbitmap_init(dev))) {
 380                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 381                 drm_proc_cleanup();
 382                 misc_deregister(&i810_misc);
 383                 i810_takedown(dev);
 384                 return retcode;
 385         }
 386
 387         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 388                  I810_NAME,
 389                  I810_MAJOR,
 390                  I810_MINOR,
 391                  I810_PATCHLEVEL,
 392                  I810_DATE,
 393                  i810_misc.minor);
 394
 395         return 0;
 396 }
 397
 398 /* i810_cleanup is called via cleanup_module at module unload time. */
 399
 400 static void i810_cleanup(void)
 401 {
 402         drm_device_t          *dev = &i810_device;
 403
 404         DRM_DEBUG("\n");
 405
 406         drm_proc_cleanup();
 407         if (misc_deregister(&i810_misc)) {
 408                 DRM_ERROR("Cannot unload module\n");
 409         } else {
 410                 DRM_INFO("Module unloaded\n");
 411         }
 412         drm_ctxbitmap_cleanup(dev);
 413         i810_takedown(dev);
 414         if (dev->agp) {
 415                 drm_agp_uninit();
 416                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 417                 dev->agp = NULL;
 418         }
 419 }
 420
 421 module_init(i810_init);
 422 module_exit(i810_cleanup);
 423
 424
 425 int i810_version(struct inode *inode, struct file *filp, unsigned int cmd,
 426                   unsigned long arg)
 427 {
 428         drm_version_t version;
 429         int           len;
 430
 431         copy_from_user_ret(&version,
 432                            (drm_version_t *)arg,
 433                            sizeof(version),
 434                            -EFAULT);
 435
 436 #define DRM_COPY(name,value)                                 \
 437         len = strlen(value);                                 \
 438         if (len > name##_len) len = name##_len;              \
 439         name##_len = strlen(value);                          \
 440         if (len && name) {                                   \
 441                 copy_to_user_ret(name, value, len, -EFAULT); \
 442         }
 443
 444         version.version_major      = I810_MAJOR;
 445         version.version_minor      = I810_MINOR;
 446         version.version_patchlevel = I810_PATCHLEVEL;
 447
 448         DRM_COPY(version.name, I810_NAME);
 449         DRM_COPY(version.date, I810_DATE);
 450         DRM_COPY(version.desc, I810_DESC);
 451
 452         copy_to_user_ret((drm_version_t *)arg,
 453                          &version,
 454                          sizeof(version),
 455                          -EFAULT);
 456         return 0;
 457 }
 458
 459 int i810_open(struct inode *inode, struct file *filp)
 460 {
 461         drm_device_t  *dev    = &i810_device;
 462         int           retcode = 0;
 463
 464         DRM_DEBUG("open_count = %d\n", dev->open_count);
 465         if (!(retcode = drm_open_helper(inode, filp, dev))) {
 466 #if LINUX_VERSION_CODE < 0x020333
 467                 MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
 468 #endif
 469                 atomic_inc(&dev->total_open);
 470                 spin_lock(&dev->count_lock);
 471                 if (!dev->open_count++) {
 472                         spin_unlock(&dev->count_lock);
 473                         return i810_setup(dev);
 474                 }
 475                 spin_unlock(&dev->count_lock);
 476         }
 477         return retcode;
 478 }
 479
 480 int i810_release(struct inode *inode, struct file *filp)
 481 {
 482         drm_file_t    *priv   = filp->private_data;
 483         drm_device_t  *dev;
 484         int           retcode = 0;
 485
 486         lock_kernel();
 487         dev    = priv->dev;
 488         DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
 489                   current->pid, dev->device, dev->open_count);
 490
 491         if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
 492             && dev->lock.pid == current->pid) {
 493                 i810_reclaim_buffers(dev, priv->pid);
 494                 DRM_ERROR("Process %d dead, freeing lock for context %d\n",
 495                           current->pid,
 496                           _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 497                 drm_lock_free(dev,
 498                               &dev->lock.hw_lock->lock,
 499                               _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 500
 501                                 /* FIXME: may require heavy-handed reset of
 502                                    hardware at this point, possibly
 503                                    processed via a callback to the X
 504                                    server. */
 505         } else if (dev->lock.hw_lock) {
 506                 /* The lock is required to reclaim buffers */
 507                 DECLARE_WAITQUEUE(entry, current);
 508                 add_wait_queue(&dev->lock.lock_queue, &entry);
 509                 for (;;) {
 510                         if (!dev->lock.hw_lock) {
 511                                 /* Device has been unregistered */
 512                                 retcode = -EINTR;
 513                                 break;
 514                         }
 515                         if (drm_lock_take(&dev->lock.hw_lock->lock,
 516                                           DRM_KERNEL_CONTEXT)) {
 517                                 dev->lock.pid       = priv->pid;
 518                                 dev->lock.lock_time = jiffies;
 519                                 atomic_inc(&dev->total_locks);
 520                                 break;  /* Got lock */
 521                         }
 522                                 /* Contention */
 523                         atomic_inc(&dev->total_sleeps);
 524                         current->state = TASK_INTERRUPTIBLE;
 525                         schedule();
 526                         if (signal_pending(current)) {
 527                                 retcode = -ERESTARTSYS;
 528                                 break;
 529                         }
 530                 }
 531                 current->state = TASK_RUNNING;
 532                 remove_wait_queue(&dev->lock.lock_queue, &entry);
 533                 if(!retcode) {
 534                         i810_reclaim_buffers(dev, priv->pid);
 535                         drm_lock_free(dev, &dev->lock.hw_lock->lock,
 536                                       DRM_KERNEL_CONTEXT);
 537                 }
 538         }
 539         drm_fasync(-1, filp, 0);
 540
 541         down(&dev->struct_sem);
 542         if (priv->prev) priv->prev->next = priv->next;
 543         else            dev->file_first  = priv->next;
 544         if (priv->next) priv->next->prev = priv->prev;
 545         else            dev->file_last   = priv->prev;
 546         up(&dev->struct_sem);
 547
 548         drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
 549 #if LINUX_VERSION_CODE < 0x020333
 550         MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
 551 #endif
 552         atomic_inc(&dev->total_close);
 553         spin_lock(&dev->count_lock);
 554         if (!--dev->open_count) {
 555                 if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 556                         DRM_ERROR("Device busy: %d %d\n",
 557                                   atomic_read(&dev->ioctl_count),
 558                                   dev->blocked);
 559                         spin_unlock(&dev->count_lock);
 560                         unlock_kernel();
 561                         return -EBUSY;
 562                 }
 563                 spin_unlock(&dev->count_lock);
 564                 unlock_kernel();
 565                 return i810_takedown(dev);
 566         }
 567         spin_unlock(&dev->count_lock);
 568         unlock_kernel();
 569         return retcode;
 570 }
 571
 572 /* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */
 573
 574 int i810_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 575                 unsigned long arg)
 576 {
 577         int              nr      = DRM_IOCTL_NR(cmd);
 578         drm_file_t       *priv   = filp->private_data;
 579         drm_device_t     *dev    = priv->dev;
 580         int              retcode = 0;
 581         drm_ioctl_desc_t *ioctl;
 582         drm_ioctl_t      *func;
 583
 584         atomic_inc(&dev->ioctl_count);
 585         atomic_inc(&dev->total_ioctl);
 586         ++priv->ioctl_count;
 587
 588         DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
 589                   current->pid, cmd, nr, dev->device, priv->authenticated);
 590
 591         if (nr >= I810_IOCTL_COUNT) {
 592                 retcode = -EINVAL;
 593         } else {
 594                 ioctl     = &i810_ioctls[nr];
 595                 func      = ioctl->func;
 596
 597                 if (!func) {
 598                         DRM_DEBUG("no function\n");
 599                         retcode = -EINVAL;
 600                 } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
 601                             || (ioctl->auth_needed && !priv->authenticated)) {
 602                         retcode = -EACCES;
 603                 } else {
 604                         retcode = (func)(inode, filp, cmd, arg);
 605                 }
 606         }
 607
 608         atomic_dec(&dev->ioctl_count);
 609         return retcode;
 610 }
 611
 612 int i810_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
 613                  unsigned long arg)
 614 {
 615         drm_file_t        *priv   = filp->private_data;
 616         drm_device_t      *dev    = priv->dev;
 617         drm_lock_t        lock;
 618
 619         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 620
 621         if (lock.context == DRM_KERNEL_CONTEXT) {
 622                 DRM_ERROR("Process %d using kernel context %d\n",
 623                           current->pid, lock.context);
 624                 return -EINVAL;
 625         }
 626
 627         DRM_DEBUG("%d frees lock (%d holds)\n",
 628                   lock.context,
 629                   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 630         atomic_inc(&dev->total_unlocks);
 631         if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
 632                 atomic_inc(&dev->total_contends);
 633         drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
 634         if (!dev->context_flag) {
 635                 if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
 636                                   DRM_KERNEL_CONTEXT)) {
 637                         DRM_ERROR("\n");
 638                 }
 639         }
 640 #if DRM_DMA_HISTOGRAM
 641         atomic_inc(&dev->histo.lhld[drm_histogram_slot(get_cycles()
 642                                                        - dev->lck_start)]);
 643 #endif
 644
 645         return 0;
 646 }