drivers/char/drm/mga_drv.c

   1 /* mga_drv.c -- Matrox g200/g400 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
  33 #include <linux/config.h>
  34 #include "drmP.h"
  35 #include "mga_drv.h"
  36
  37 #define MGA_NAME         "mga"
  38 #define MGA_DESC         "Matrox g200/g400"
  39 #define MGA_DATE         "20000719"
  40 #define MGA_MAJOR        1
  41 #define MGA_MINOR        0
  42 #define MGA_PATCHLEVEL   0
  43
  44 static drm_device_t           mga_device;
  45 drm_ctx_t                     mga_res_ctx;
  46
  47 static struct file_operations mga_fops = {
  48 #if LINUX_VERSION_CODE >= 0x020322
  49                                 /* This started being used approx. 2.3.34 */
  50         owner:   THIS_MODULE,
  51 #endif
  52         open:    mga_open,
  53         flush:   drm_flush,
  54         release: mga_release,
  55         ioctl:   mga_ioctl,
  56         mmap:    drm_mmap,
  57         read:    drm_read,
  58         fasync:  drm_fasync,
  59         poll:    drm_poll,
  60 };
  61
  62 static struct miscdevice      mga_misc = {
  63         minor: MISC_DYNAMIC_MINOR,
  64         name:  MGA_NAME,
  65         fops:  &mga_fops,
  66 };
  67
  68 static drm_ioctl_desc_t       mga_ioctls[] = {
  69         [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]     = { mga_version,    0, 0 },
  70         [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)]  = { drm_getunique,  0, 0 },
  71         [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]   = { drm_getmagic,   0, 0 },
  72         [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]   = { drm_irq_busid,  0, 1 },
  73
  74         [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)]  = { drm_setunique,  1, 1 },
  75         [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]       = { drm_block,      1, 1 },
  76         [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]     = { drm_unblock,    1, 1 },
  77         [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]     = { mga_control,    1, 1 },
  78         [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)]  = { drm_authmagic,  1, 1 },
  79         [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]     = { drm_addmap,     1, 1 },
  80         [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]    = { mga_addbufs,    1, 1 },
  81         [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]   = { mga_markbufs,   1, 1 },
  82         [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]   = { mga_infobufs,   1, 0 },
  83         [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]    = { mga_mapbufs,    1, 0 },
  84         [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]   = { mga_freebufs,   1, 0 },
  85
  86         [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]     = { mga_addctx,     1, 1 },
  87         [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]      = { mga_rmctx,      1, 1 },
  88         [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]     = { mga_modctx,     1, 1 },
  89         [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]     = { mga_getctx,     1, 0 },
  90         [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)]  = { mga_switchctx,  1, 1 },
  91         [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]     = { mga_newctx,     1, 1 },
  92         [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]     = { mga_resctx,     1, 0 },
  93         [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]    = { drm_adddraw,    1, 1 },
  94         [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]     = { drm_rmdraw,     1, 1 },
  95
  96         [DRM_IOCTL_NR(DRM_IOCTL_DMA)]         = { mga_dma,        1, 0 },
  97
  98         [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]        = { mga_lock,       1, 0 },
  99         [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]      = { mga_unlock,     1, 0 },
 100         [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]      = { drm_finish,     1, 0 },
 101
 102         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = { drm_agp_acquire, 1, 1 },
 103         [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = { drm_agp_release, 1, 1 },
 104         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]  = { drm_agp_enable,  1, 1 },
 105         [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]    = { drm_agp_info,    1, 0 },
 106         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]   = { drm_agp_alloc,   1, 1 },
 107         [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]    = { drm_agp_free,    1, 1 },
 108         [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]    = { drm_agp_bind,    1, 1 },
 109         [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]  = { drm_agp_unbind,  1, 1 },
 110         [DRM_IOCTL_NR(DRM_IOCTL_MGA_INIT)]    = { mga_dma_init,    1, 1 },
 111         [DRM_IOCTL_NR(DRM_IOCTL_MGA_SWAP)]    = { mga_swap_bufs,   1, 0 },
 112         [DRM_IOCTL_NR(DRM_IOCTL_MGA_CLEAR)]   = { mga_clear_bufs,  1, 0 },
 113         [DRM_IOCTL_NR(DRM_IOCTL_MGA_ILOAD)]   = { mga_iload,       1, 0 },
 114         [DRM_IOCTL_NR(DRM_IOCTL_MGA_VERTEX)]  = { mga_vertex,      1, 0 },
 115         [DRM_IOCTL_NR(DRM_IOCTL_MGA_FLUSH)]   = { mga_flush_ioctl, 1, 0 },
 116         [DRM_IOCTL_NR(DRM_IOCTL_MGA_INDICES)] = { mga_indices,     1, 0 },
 117 };
 118
 119 #define MGA_IOCTL_COUNT DRM_ARRAY_SIZE(mga_ioctls)
 120
 121 #ifdef MODULE
 122 static char                   *mga = NULL;
 123 #endif
 124
 125 MODULE_AUTHOR("VA Linux Systems, Inc.");
 126 MODULE_DESCRIPTION("Matrox g200/g400");
 127 MODULE_PARM(mga, "s");
 128
 129 #ifndef MODULE
 130 /* mga_options is called by the kernel to parse command-line options passed
 131  * via the boot-loader (e.g., LILO).  It calls the insmod option routine,
 132  * drm_parse_drm.
 133  */
 134
 135 static int __init mga_options(char *str)
 136 {
 137         drm_parse_options(str);
 138         return 1;
 139 }
 140
 141 __setup("mga=", mga_options);
 142 #endif
 143
 144 static int mga_setup(drm_device_t *dev)
 145 {
 146         int i;
 147
 148         atomic_set(&dev->ioctl_count, 0);
 149         atomic_set(&dev->vma_count, 0);
 150         dev->buf_use      = 0;
 151         atomic_set(&dev->buf_alloc, 0);
 152
 153         drm_dma_setup(dev);
 154
 155         atomic_set(&dev->total_open, 0);
 156         atomic_set(&dev->total_close, 0);
 157         atomic_set(&dev->total_ioctl, 0);
 158         atomic_set(&dev->total_irq, 0);
 159         atomic_set(&dev->total_ctx, 0);
 160         atomic_set(&dev->total_locks, 0);
 161         atomic_set(&dev->total_unlocks, 0);
 162         atomic_set(&dev->total_contends, 0);
 163         atomic_set(&dev->total_sleeps, 0);
 164
 165         for (i = 0; i < DRM_HASH_SIZE; i++) {
 166                 dev->magiclist[i].head = NULL;
 167                 dev->magiclist[i].tail = NULL;
 168         }
 169         dev->maplist        = NULL;
 170         dev->map_count      = 0;
 171         dev->vmalist        = NULL;
 172         dev->lock.hw_lock   = NULL;
 173         init_waitqueue_head(&dev->lock.lock_queue);
 174         dev->queue_count    = 0;
 175         dev->queue_reserved = 0;
 176         dev->queue_slots    = 0;
 177         dev->queuelist      = NULL;
 178         dev->irq            = 0;
 179         dev->context_flag   = 0;
 180         dev->interrupt_flag = 0;
 181         dev->dma_flag       = 0;
 182         dev->last_context   = 0;
 183         dev->last_switch    = 0;
 184         dev->last_checked   = 0;
 185         init_timer(&dev->timer);
 186         init_waitqueue_head(&dev->context_wait);
 187
 188         dev->ctx_start      = 0;
 189         dev->lck_start      = 0;
 190
 191         dev->buf_rp       = dev->buf;
 192         dev->buf_wp       = dev->buf;
 193         dev->buf_end      = dev->buf + DRM_BSZ;
 194         dev->buf_async    = NULL;
 195         init_waitqueue_head(&dev->buf_readers);
 196         init_waitqueue_head(&dev->buf_writers);
 197
 198         DRM_DEBUG("\n");
 199
 200         /* The kernel's context could be created here, but is now created
 201            in drm_dma_enqueue.  This is more resource-efficient for
 202            hardware that does not do DMA, but may mean that
 203            drm_select_queue fails between the time the interrupt is
 204            initialized and the time the queues are initialized. */
 205
 206         return 0;
 207 }
 208
 209
 210 static int mga_takedown(drm_device_t *dev)
 211 {
 212         int               i;
 213         drm_magic_entry_t *pt, *next;
 214         drm_map_t         *map;
 215         drm_vma_entry_t   *vma, *vma_next;
 216
 217         DRM_DEBUG("\n");
 218
 219         if (dev->irq) mga_irq_uninstall(dev);
 220
 221         down(&dev->struct_sem);
 222         del_timer(&dev->timer);
 223
 224         if (dev->devname) {
 225                 drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
 226                 dev->devname = NULL;
 227         }
 228
 229         if (dev->unique) {
 230                 drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
 231                 dev->unique = NULL;
 232                 dev->unique_len = 0;
 233         }
 234                                 /* Clear pid list */
 235         for (i = 0; i < DRM_HASH_SIZE; i++) {
 236                 for (pt = dev->magiclist[i].head; pt; pt = next) {
 237                         next = pt->next;
 238                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 239                 }
 240                 dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
 241         }
 242                                 /* Clear AGP information */
 243         if (dev->agp) {
 244                 drm_agp_mem_t *entry;
 245                 drm_agp_mem_t *nexte;
 246
 247                                 /* Remove AGP resources, but leave dev->agp
 248                                    intact until cleanup is called. */
 249                 for (entry = dev->agp->memory; entry; entry = nexte) {
 250                         nexte = entry->next;
 251                         if (entry->bound) drm_unbind_agp(entry->memory);
 252                         drm_free_agp(entry->memory, entry->pages);
 253                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 254                 }
 255                 dev->agp->memory = NULL;
 256
 257                 if (dev->agp->acquired && drm_agp.release)
 258                         (*drm_agp.release)();
 259
 260                 dev->agp->acquired = 0;
 261                 dev->agp->enabled  = 0;
 262         }
 263                                 /* Clear vma list (only built for debugging) */
 264         if (dev->vmalist) {
 265                 for (vma = dev->vmalist; vma; vma = vma_next) {
 266                         vma_next = vma->next;
 267                         drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 268                 }
 269                 dev->vmalist = NULL;
 270         }
 271
 272                                 /* Clear map area and mtrr information */
 273         if (dev->maplist) {
 274                 for (i = 0; i < dev->map_count; i++) {
 275                         map = dev->maplist[i];
 276                         switch (map->type) {
 277                         case _DRM_REGISTERS:
 278                         case _DRM_FRAME_BUFFER:
 279 #ifdef CONFIG_MTRR
 280                                 if (map->mtrr >= 0) {
 281                                         int retcode;
 282                                         retcode = mtrr_del(map->mtrr,
 283                                                            map->offset,
 284                                                            map->size);
 285                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 286                                 }
 287 #endif
 288                                 drm_ioremapfree(map->handle, map->size);
 289                                 break;
 290                         case _DRM_SHM:
 291                                 drm_free_pages((unsigned long)map->handle,
 292                                                drm_order(map->size)
 293                                                - PAGE_SHIFT,
 294                                                DRM_MEM_SAREA);
 295                                 break;
 296                         case _DRM_AGP:
 297                                 break;
 298                         }
 299                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 300                 }
 301                 drm_free(dev->maplist,
 302                          dev->map_count * sizeof(*dev->maplist),
 303                          DRM_MEM_MAPS);
 304                 dev->maplist   = NULL;
 305                 dev->map_count = 0;
 306         }
 307
 308         if (dev->queuelist) {
 309                 for (i = 0; i < dev->queue_count; i++) {
 310                         drm_waitlist_destroy(&dev->queuelist[i]->waitlist);
 311                         if (dev->queuelist[i]) {
 312                                 drm_free(dev->queuelist[i],
 313                                          sizeof(*dev->queuelist[0]),
 314                                          DRM_MEM_QUEUES);
 315                                 dev->queuelist[i] = NULL;
 316                         }
 317                 }
 318                 drm_free(dev->queuelist,
 319                          dev->queue_slots * sizeof(*dev->queuelist),
 320                          DRM_MEM_QUEUES);
 321                 dev->queuelist   = NULL;
 322         }
 323
 324         drm_dma_takedown(dev);
 325
 326         dev->queue_count     = 0;
 327         if (dev->lock.hw_lock) {
 328                 dev->lock.hw_lock    = NULL; /* SHM removed */
 329                 dev->lock.pid        = 0;
 330                 wake_up_interruptible(&dev->lock.lock_queue);
 331         }
 332         up(&dev->struct_sem);
 333
 334         return 0;
 335 }
 336
 337 /* mga_init is called via init_module at module load time, or via
 338  * linux/init/main.c (this is not currently supported). */
 339
 340 static int mga_init(void)
 341 {
 342         int                   retcode;
 343         drm_device_t          *dev = &mga_device;
 344
 345         DRM_DEBUG("\n");
 346
 347         memset((void *)dev, 0, sizeof(*dev));
 348         dev->count_lock   = SPIN_LOCK_UNLOCKED;
 349         sema_init(&dev->struct_sem, 1);
 350
 351 #ifdef MODULE
 352         drm_parse_options(mga);
 353 #endif
 354         DRM_DEBUG("doing misc_register\n");
 355         if ((retcode = misc_register(&mga_misc))) {
 356                 DRM_ERROR("Cannot register \"%s\"\n", MGA_NAME);
 357                 return retcode;
 358         }
 359         dev->device = MKDEV(MISC_MAJOR, mga_misc.minor);
 360         dev->name   = MGA_NAME;
 361
 362         DRM_DEBUG("doing mem init\n");
 363         drm_mem_init();
 364         DRM_DEBUG("doing proc init\n");
 365         drm_proc_init(dev);
 366         DRM_DEBUG("doing agp init\n");
 367         dev->agp    = drm_agp_init();
 368         if(dev->agp == NULL) {
 369                 DRM_INFO("The mga drm module requires the agpgart module"
 370                          " to function correctly\nPlease load the agpgart"
 371                          " module before you load the mga module\n");
 372                 drm_proc_cleanup();
 373                 misc_deregister(&mga_misc);
 374                 mga_takedown(dev);
 375                 return -ENOMEM;
 376         }
 377 #ifdef CONFIG_MTRR
 378         dev->agp->agp_mtrr = mtrr_add(dev->agp->agp_info.aper_base,
 379                                       dev->agp->agp_info.aper_size * 1024 * 1024,
 380                                       MTRR_TYPE_WRCOMB,
 381                                       1);
 382 #endif
 383         DRM_DEBUG("doing ctxbitmap init\n");
 384         if((retcode = drm_ctxbitmap_init(dev))) {
 385                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 386                 drm_proc_cleanup();
 387                 misc_deregister(&mga_misc);
 388                 mga_takedown(dev);
 389                 return retcode;
 390         }
 391
 392         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 393                  MGA_NAME,
 394                  MGA_MAJOR,
 395                  MGA_MINOR,
 396                  MGA_PATCHLEVEL,
 397                  MGA_DATE,
 398                  mga_misc.minor);
 399
 400         return 0;
 401 }
 402
 403 /* mga_cleanup is called via cleanup_module at module unload time. */
 404
 405 static void mga_cleanup(void)
 406 {
 407         drm_device_t          *dev = &mga_device;
 408
 409         DRM_DEBUG("\n");
 410
 411         drm_proc_cleanup();
 412         if (misc_deregister(&mga_misc)) {
 413                 DRM_ERROR("Cannot unload module\n");
 414         } else {
 415                 DRM_INFO("Module unloaded\n");
 416         }
 417         drm_ctxbitmap_cleanup(dev);
 418         mga_dma_cleanup(dev);
 419 #ifdef CONFIG_MTRR
 420         if(dev->agp && dev->agp->agp_mtrr) {
 421                 int retval;
 422                 retval = mtrr_del(dev->agp->agp_mtrr,
 423                                   dev->agp->agp_info.aper_base,
 424                                   dev->agp->agp_info.aper_size * 1024*1024);
 425                 DRM_DEBUG("mtrr_del = %d\n", retval);
 426         }
 427 #endif
 428
 429         mga_takedown(dev);
 430         if (dev->agp) {
 431                 drm_agp_uninit();
 432                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 433                 dev->agp = NULL;
 434         }
 435 }
 436
 437 module_init(mga_init);
 438 module_exit(mga_cleanup);
 439
 440
 441 int mga_version(struct inode *inode, struct file *filp, unsigned int cmd,
 442                   unsigned long arg)
 443 {
 444         drm_version_t version;
 445         int           len;
 446
 447         copy_from_user_ret(&version,
 448                            (drm_version_t *)arg,
 449                            sizeof(version),
 450                            -EFAULT);
 451
 452 #define DRM_COPY(name,value)                                 \
 453         len = strlen(value);                                 \
 454         if (len > name##_len) len = name##_len;              \
 455         name##_len = strlen(value);                          \
 456         if (len && name) {                                   \
 457                 copy_to_user_ret(name, value, len, -EFAULT); \
 458         }
 459
 460         version.version_major      = MGA_MAJOR;
 461         version.version_minor      = MGA_MINOR;
 462         version.version_patchlevel = MGA_PATCHLEVEL;
 463
 464         DRM_COPY(version.name, MGA_NAME);
 465         DRM_COPY(version.date, MGA_DATE);
 466         DRM_COPY(version.desc, MGA_DESC);
 467
 468         copy_to_user_ret((drm_version_t *)arg,
 469                          &version,
 470                          sizeof(version),
 471                          -EFAULT);
 472         return 0;
 473 }
 474
 475 int mga_open(struct inode *inode, struct file *filp)
 476 {
 477         drm_device_t  *dev    = &mga_device;
 478         int           retcode = 0;
 479
 480         DRM_DEBUG("open_count = %d\n", dev->open_count);
 481         if (!(retcode = drm_open_helper(inode, filp, dev))) {
 482 #if LINUX_VERSION_CODE < 0x020333
 483                 MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
 484 #endif
 485                 atomic_inc(&dev->total_open);
 486                 spin_lock(&dev->count_lock);
 487                 if (!dev->open_count++) {
 488                         spin_unlock(&dev->count_lock);
 489                         return mga_setup(dev);
 490                 }
 491                 spin_unlock(&dev->count_lock);
 492         }
 493         return retcode;
 494 }
 495
 496 int mga_release(struct inode *inode, struct file *filp)
 497 {
 498         drm_file_t    *priv   = filp->private_data;
 499         drm_device_t  *dev;
 500         int           retcode = 0;
 501
 502         lock_kernel();
 503         dev    = priv->dev;
 504         DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
 505                   current->pid, dev->device, dev->open_count);
 506
 507         if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
 508             && dev->lock.pid == current->pid) {
 509                 mga_reclaim_buffers(dev, priv->pid);
 510                 DRM_ERROR("Process %d dead, freeing lock for context %d\n",
 511                           current->pid,
 512                           _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 513                 drm_lock_free(dev,
 514                               &dev->lock.hw_lock->lock,
 515                               _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 516
 517                                 /* FIXME: may require heavy-handed reset of
 518                                    hardware at this point, possibly
 519                                    processed via a callback to the X
 520                                    server. */
 521         } else if (dev->lock.hw_lock) {
 522                 /* The lock is required to reclaim buffers */
 523                 DECLARE_WAITQUEUE(entry, current);
 524                 add_wait_queue(&dev->lock.lock_queue, &entry);
 525                 for (;;) {
 526                         if (!dev->lock.hw_lock) {
 527                                 /* Device has been unregistered */
 528                                 retcode = -EINTR;
 529                                 break;
 530                         }
 531                         if (drm_lock_take(&dev->lock.hw_lock->lock,
 532                                           DRM_KERNEL_CONTEXT)) {
 533                                 dev->lock.pid       = priv->pid;
 534                                 dev->lock.lock_time = jiffies;
 535                                 atomic_inc(&dev->total_locks);
 536                                 break;  /* Got lock */
 537                         }
 538                                 /* Contention */
 539                         atomic_inc(&dev->total_sleeps);
 540                         current->state = TASK_INTERRUPTIBLE;
 541                         schedule();
 542                         if (signal_pending(current)) {
 543                                 retcode = -ERESTARTSYS;
 544                                 break;
 545                         }
 546                 }
 547                 current->state = TASK_RUNNING;
 548                 remove_wait_queue(&dev->lock.lock_queue, &entry);
 549                 if(!retcode) {
 550                         mga_reclaim_buffers(dev, priv->pid);
 551                         drm_lock_free(dev, &dev->lock.hw_lock->lock,
 552                                       DRM_KERNEL_CONTEXT);
 553                 }
 554         }
 555         drm_fasync(-1, filp, 0);
 556
 557         down(&dev->struct_sem);
 558         if (priv->prev) priv->prev->next = priv->next;
 559         else            dev->file_first  = priv->next;
 560         if (priv->next) priv->next->prev = priv->prev;
 561         else            dev->file_last   = priv->prev;
 562         up(&dev->struct_sem);
 563
 564         drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
 565 #if LINUX_VERSION_CODE < 0x020333
 566         MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
 567 #endif
 568         atomic_inc(&dev->total_close);
 569         spin_lock(&dev->count_lock);
 570         if (!--dev->open_count) {
 571                 if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 572                         DRM_ERROR("Device busy: %d %d\n",
 573                                   atomic_read(&dev->ioctl_count),
 574                                   dev->blocked);
 575                         spin_unlock(&dev->count_lock);
 576                         unlock_kernel();
 577                         return -EBUSY;
 578                 }
 579                 spin_unlock(&dev->count_lock);
 580                 unlock_kernel();
 581                 return mga_takedown(dev);
 582         }
 583         spin_unlock(&dev->count_lock);
 584         unlock_kernel();
 585         return retcode;
 586 }
 587
 588
 589 /* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */
 590
 591 int mga_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 592                 unsigned long arg)
 593 {
 594         int              nr      = DRM_IOCTL_NR(cmd);
 595         drm_file_t       *priv   = filp->private_data;
 596         drm_device_t     *dev    = priv->dev;
 597         int              retcode = 0;
 598         drm_ioctl_desc_t *ioctl;
 599         drm_ioctl_t      *func;
 600
 601         atomic_inc(&dev->ioctl_count);
 602         atomic_inc(&dev->total_ioctl);
 603         ++priv->ioctl_count;
 604
 605         DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
 606                   current->pid, cmd, nr, dev->device, priv->authenticated);
 607
 608         if (nr >= MGA_IOCTL_COUNT) {
 609                 retcode = -EINVAL;
 610         } else {
 611                 ioctl     = &mga_ioctls[nr];
 612                 func      = ioctl->func;
 613
 614                 if (!func) {
 615                         DRM_DEBUG("no function\n");
 616                         retcode = -EINVAL;
 617                 } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
 618                             || (ioctl->auth_needed && !priv->authenticated)) {
 619                         retcode = -EACCES;
 620                 } else {
 621                         retcode = (func)(inode, filp, cmd, arg);
 622                 }
 623         }
 624
 625         atomic_dec(&dev->ioctl_count);
 626         return retcode;
 627 }
 628
 629 int mga_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
 630                  unsigned long arg)
 631 {
 632         drm_file_t        *priv   = filp->private_data;
 633         drm_device_t      *dev    = priv->dev;
 634         drm_lock_t        lock;
 635
 636         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 637
 638         if (lock.context == DRM_KERNEL_CONTEXT) {
 639                 DRM_ERROR("Process %d using kernel context %d\n",
 640                           current->pid, lock.context);
 641                 return -EINVAL;
 642         }
 643
 644         DRM_DEBUG("%d frees lock (%d holds)\n",
 645                   lock.context,
 646                   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 647         atomic_inc(&dev->total_unlocks);
 648         if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
 649                 atomic_inc(&dev->total_contends);
 650         drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
 651         mga_dma_schedule(dev, 1);
 652
 653         if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
 654                           DRM_KERNEL_CONTEXT)) {
 655            DRM_ERROR("\n");
 656         }
 657
 658         return 0;
 659 }