linux-core/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 #define EXPORT_SYMTAB
  35 #include "drmP.h"
  36 #include "mga_drv.h"
  37 EXPORT_SYMBOL(mga_init);
  38 EXPORT_SYMBOL(mga_cleanup);
  39
  40 #define MGA_NAME         "mga"
  41 #define MGA_DESC         "Matrox g200/g400"
  42 #define MGA_DATE         "19991213"
  43 #define MGA_MAJOR        1
  44 #define MGA_MINOR        0
  45 #define MGA_PATCHLEVEL   0
  46
  47 static drm_device_t           mga_device;
  48 drm_ctx_t                     mga_res_ctx;
  49
  50 static struct file_operations mga_fops = {
  51         open:    mga_open,
  52         flush:   drm_flush,
  53         release: mga_release,
  54         ioctl:   mga_ioctl,
  55         mmap:    drm_mmap,
  56         read:    drm_read,
  57         fasync:  drm_fasync,
  58         poll:    drm_poll,
  59 };
  60
  61 static struct miscdevice      mga_misc = {
  62         minor: MISC_DYNAMIC_MINOR,
  63         name:  MGA_NAME,
  64         fops:  &mga_fops,
  65 };
  66
  67 static drm_ioctl_desc_t       mga_ioctls[] = {
  68         [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]     = { mga_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)]     = { mga_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)]    = { mga_addbufs,    1, 1 },
  80         [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]   = { mga_markbufs,   1, 1 },
  81         [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]   = { mga_infobufs,   1, 0 },
  82         [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]    = { mga_mapbufs,    1, 0 },
  83         [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]   = { mga_freebufs,   1, 0 },
  84
  85         [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]     = { mga_addctx,     1, 1 },
  86         [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]      = { mga_rmctx,      1, 1 },
  87         [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]     = { mga_modctx,     1, 1 },
  88         [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]     = { mga_getctx,     1, 0 },
  89         [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)]  = { mga_switchctx,  1, 1 },
  90         [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]     = { mga_newctx,     1, 1 },
  91         [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]     = { mga_resctx,     1, 0 },
  92         [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]    = { drm_adddraw,    1, 1 },
  93         [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]     = { drm_rmdraw,     1, 1 },
  94
  95         [DRM_IOCTL_NR(DRM_IOCTL_DMA)]         = { mga_dma,        1, 0 },
  96
  97         [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]        = { mga_lock,       1, 0 },
  98         [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]      = { mga_unlock,     1, 0 },
  99         [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]      = { drm_finish,     1, 0 },
 100
 101         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = { drm_agp_acquire, 1, 1 },
 102         [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = { drm_agp_release, 1, 1 },
 103         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]  = { drm_agp_enable,  1, 1 },
 104         [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]    = { drm_agp_info,    1, 0 },
 105         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]   = { drm_agp_alloc,   1, 1 },
 106         [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]    = { drm_agp_free,    1, 1 },
 107         [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]    = { drm_agp_bind,    1, 1 },
 108         [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]  = { drm_agp_unbind,  1, 1 },
 109         [DRM_IOCTL_NR(DRM_IOCTL_MGA_INIT)]    = { mga_dma_init,    1, 1 },
 110         [DRM_IOCTL_NR(DRM_IOCTL_MGA_SWAP)]    = { mga_swap_bufs,   1, 0 },
 111         [DRM_IOCTL_NR(DRM_IOCTL_MGA_CLEAR)]   = { mga_clear_bufs,  1, 0 },
 112         [DRM_IOCTL_NR(DRM_IOCTL_MGA_ILOAD)]   = { mga_iload,       1, 0 },
 113         [DRM_IOCTL_NR(DRM_IOCTL_MGA_VERTEX)]  = { mga_vertex,      1, 0 },
 114         [DRM_IOCTL_NR(DRM_IOCTL_MGA_FLUSH)]   = { mga_flush_ioctl, 1, 0 },
 115         [DRM_IOCTL_NR(DRM_IOCTL_MGA_INDICES)] = { mga_indices,     1, 0 },
 116 };
 117
 118 #define MGA_IOCTL_COUNT DRM_ARRAY_SIZE(mga_ioctls)
 119
 120 #ifdef MODULE
 121 int                           init_module(void);
 122 void                          cleanup_module(void);
 123 static char                   *mga = NULL;
 124
 125 MODULE_AUTHOR("Precision Insight, Inc., Cedar Park, Texas.");
 126 MODULE_DESCRIPTION("Matrox g200/g400");
 127 MODULE_PARM(mga, "s");
 128
 129 /* init_module is called when insmod is used to load the module */
 130
 131 int init_module(void)
 132 {
 133         DRM_DEBUG("doing mga_init()\n");
 134         return mga_init();
 135 }
 136
 137 /* cleanup_module is called when rmmod is used to unload the module */
 138
 139 void cleanup_module(void)
 140 {
 141         mga_cleanup();
 142 }
 143 #endif
 144
 145 #ifndef MODULE
 146 /* mga_setup is called by the kernel to parse command-line options passed
 147  * via the boot-loader (e.g., LILO).  It calls the insmod option routine,
 148  * drm_parse_drm.
 149  *
 150  * This is not currently supported, since it requires changes to
 151  * linux/init/main.c. */
 152
 153
 154 void __init mga_setup(char *str, int *ints)
 155 {
 156         if (ints[0] != 0) {
 157                 DRM_ERROR("Illegal command line format, ignored\n");
 158                 return;
 159         }
 160         drm_parse_options(str);
 161 }
 162 #endif
 163
 164 static int mga_setup(drm_device_t *dev)
 165 {
 166         int i;
 167
 168         atomic_set(&dev->ioctl_count, 0);
 169         atomic_set(&dev->vma_count, 0);
 170         dev->buf_use      = 0;
 171         atomic_set(&dev->buf_alloc, 0);
 172
 173         drm_dma_setup(dev);
 174
 175         atomic_set(&dev->total_open, 0);
 176         atomic_set(&dev->total_close, 0);
 177         atomic_set(&dev->total_ioctl, 0);
 178         atomic_set(&dev->total_irq, 0);
 179         atomic_set(&dev->total_ctx, 0);
 180         atomic_set(&dev->total_locks, 0);
 181         atomic_set(&dev->total_unlocks, 0);
 182         atomic_set(&dev->total_contends, 0);
 183         atomic_set(&dev->total_sleeps, 0);
 184
 185         for (i = 0; i < DRM_HASH_SIZE; i++) {
 186                 dev->magiclist[i].head = NULL;
 187                 dev->magiclist[i].tail = NULL;
 188         }
 189         dev->maplist        = NULL;
 190         dev->map_count      = 0;
 191         dev->vmalist        = NULL;
 192         dev->lock.hw_lock   = NULL;
 193         init_waitqueue_head(&dev->lock.lock_queue);
 194         dev->queue_count    = 0;
 195         dev->queue_reserved = 0;
 196         dev->queue_slots    = 0;
 197         dev->queuelist      = NULL;
 198         dev->irq            = 0;
 199         dev->context_flag   = 0;
 200         dev->interrupt_flag = 0;
 201         dev->dma_flag       = 0;
 202         dev->last_context   = 0;
 203         dev->last_switch    = 0;
 204         dev->last_checked   = 0;
 205         init_timer(&dev->timer);
 206         init_waitqueue_head(&dev->context_wait);
 207
 208         dev->ctx_start      = 0;
 209         dev->lck_start      = 0;
 210
 211         dev->buf_rp       = dev->buf;
 212         dev->buf_wp       = dev->buf;
 213         dev->buf_end      = dev->buf + DRM_BSZ;
 214         dev->buf_async    = NULL;
 215         init_waitqueue_head(&dev->buf_readers);
 216         init_waitqueue_head(&dev->buf_writers);
 217
 218         DRM_DEBUG("\n");
 219
 220         /* The kernel's context could be created here, but is now created
 221            in drm_dma_enqueue.  This is more resource-efficient for
 222            hardware that does not do DMA, but may mean that
 223            drm_select_queue fails between the time the interrupt is
 224            initialized and the time the queues are initialized. */
 225
 226         return 0;
 227 }
 228
 229
 230 static int mga_takedown(drm_device_t *dev)
 231 {
 232         int               i;
 233         drm_magic_entry_t *pt, *next;
 234         drm_map_t         *map;
 235         drm_vma_entry_t   *vma, *vma_next;
 236
 237         DRM_DEBUG("\n");
 238
 239         if (dev->irq) mga_irq_uninstall(dev);
 240
 241         down(&dev->struct_sem);
 242         del_timer(&dev->timer);
 243
 244         if (dev->devname) {
 245                 drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
 246                 dev->devname = NULL;
 247         }
 248
 249         if (dev->unique) {
 250                 drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
 251                 dev->unique = NULL;
 252                 dev->unique_len = 0;
 253         }
 254                                 /* Clear pid list */
 255         for (i = 0; i < DRM_HASH_SIZE; i++) {
 256                 for (pt = dev->magiclist[i].head; pt; pt = next) {
 257                         next = pt->next;
 258                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 259                 }
 260                 dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
 261         }
 262                                 /* Clear AGP information */
 263         if (dev->agp) {
 264                 drm_agp_mem_t *entry;
 265                 drm_agp_mem_t *nexte;
 266
 267                                 /* Remove AGP resources, but leave dev->agp
 268                                    intact until cleanup is called. */
 269                 for (entry = dev->agp->memory; entry; entry = nexte) {
 270                         nexte = entry->next;
 271                         if (entry->bound) drm_unbind_agp(entry->memory);
 272                         drm_free_agp(entry->memory, entry->pages);
 273                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 274                 }
 275                 dev->agp->memory = NULL;
 276
 277                 if (dev->agp->acquired && drm_agp.release)
 278                         (*drm_agp.release)();
 279
 280                 dev->agp->acquired = 0;
 281                 dev->agp->enabled  = 0;
 282         }
 283                                 /* Clear vma list (only built for debugging) */
 284         if (dev->vmalist) {
 285                 for (vma = dev->vmalist; vma; vma = vma_next) {
 286                         vma_next = vma->next;
 287                         drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 288                 }
 289                 dev->vmalist = NULL;
 290         }
 291
 292                                 /* Clear map area and mtrr information */
 293         if (dev->maplist) {
 294                 for (i = 0; i < dev->map_count; i++) {
 295                         map = dev->maplist[i];
 296                         switch (map->type) {
 297                         case _DRM_REGISTERS:
 298                         case _DRM_FRAME_BUFFER:
 299 #ifdef CONFIG_MTRR
 300                                 if (map->mtrr >= 0) {
 301                                         int retcode;
 302                                         retcode = mtrr_del(map->mtrr,
 303                                                            map->offset,
 304                                                            map->size);
 305                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 306                                 }
 307 #endif
 308                                 drm_ioremapfree(map->handle, map->size);
 309                                 break;
 310                         case _DRM_SHM:
 311                                 drm_free_pages((unsigned long)map->handle,
 312                                                drm_order(map->size)
 313                                                - PAGE_SHIFT,
 314                                                DRM_MEM_SAREA);
 315                                 break;
 316                         case _DRM_AGP:
 317                                 break;
 318                         }
 319                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 320                 }
 321                 drm_free(dev->maplist,
 322                          dev->map_count * sizeof(*dev->maplist),
 323                          DRM_MEM_MAPS);
 324                 dev->maplist   = NULL;
 325                 dev->map_count = 0;
 326         }
 327
 328         if (dev->queuelist) {
 329                 for (i = 0; i < dev->queue_count; i++) {
 330                         drm_waitlist_destroy(&dev->queuelist[i]->waitlist);
 331                         if (dev->queuelist[i]) {
 332                                 drm_free(dev->queuelist[i],
 333                                          sizeof(*dev->queuelist[0]),
 334                                          DRM_MEM_QUEUES);
 335                                 dev->queuelist[i] = NULL;
 336                         }
 337                 }
 338                 drm_free(dev->queuelist,
 339                          dev->queue_slots * sizeof(*dev->queuelist),
 340                          DRM_MEM_QUEUES);
 341                 dev->queuelist   = NULL;
 342         }
 343
 344         drm_dma_takedown(dev);
 345
 346         dev->queue_count     = 0;
 347         if (dev->lock.hw_lock) {
 348                 dev->lock.hw_lock    = NULL; /* SHM removed */
 349                 dev->lock.pid        = 0;
 350                 wake_up_interruptible(&dev->lock.lock_queue);
 351         }
 352         up(&dev->struct_sem);
 353
 354         return 0;
 355 }
 356
 357 /* mga_init is called via init_module at module load time, or via
 358  * linux/init/main.c (this is not currently supported). */
 359
 360 int mga_init(void)
 361 {
 362         int                   retcode;
 363         drm_device_t          *dev = &mga_device;
 364
 365         DRM_DEBUG("\n");
 366
 367         memset((void *)dev, 0, sizeof(*dev));
 368         dev->count_lock   = SPIN_LOCK_UNLOCKED;
 369         sema_init(&dev->struct_sem, 1);
 370
 371 #ifdef MODULE
 372         drm_parse_options(mga);
 373 #endif
 374         DRM_DEBUG("doing misc_register\n");
 375         if ((retcode = misc_register(&mga_misc))) {
 376                 DRM_ERROR("Cannot register \"%s\"\n", MGA_NAME);
 377                 return retcode;
 378         }
 379         dev->device = MKDEV(MISC_MAJOR, mga_misc.minor);
 380         dev->name   = MGA_NAME;
 381
 382         DRM_DEBUG("doing mem init\n");
 383         drm_mem_init();
 384         DRM_DEBUG("doing proc init\n");
 385         drm_proc_init(dev);
 386         DRM_DEBUG("doing agp init\n");
 387         dev->agp    = drm_agp_init();
 388         if(dev->agp == NULL) {
 389                 DRM_INFO("The mga drm module requires the agpgart module"
 390                          " to function correctly\nPlease load the agpgart"
 391                          " module before you load the mga module\n");
 392                 drm_proc_cleanup();
 393                 misc_deregister(&mga_misc);
 394                 mga_takedown(dev);
 395                 return -ENOMEM;
 396         }
 397 #ifdef CONFIG_MTRR
 398         dev->agp->agp_mtrr = mtrr_add(dev->agp->agp_info.aper_base,
 399                                       dev->agp->agp_info.aper_size * 1024 * 1024,
 400                                       MTRR_TYPE_WRCOMB,
 401                                       1);
 402 #endif
 403         DRM_DEBUG("doing ctxbitmap init\n");
 404         if((retcode = drm_ctxbitmap_init(dev))) {
 405                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 406                 drm_proc_cleanup();
 407                 misc_deregister(&mga_misc);
 408                 mga_takedown(dev);
 409                 return retcode;
 410         }
 411
 412         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 413                  MGA_NAME,
 414                  MGA_MAJOR,
 415                  MGA_MINOR,
 416                  MGA_PATCHLEVEL,
 417                  MGA_DATE,
 418                  mga_misc.minor);
 419
 420         return 0;
 421 }
 422
 423 /* mga_cleanup is called via cleanup_module at module unload time. */
 424
 425 void mga_cleanup(void)
 426 {
 427         drm_device_t          *dev = &mga_device;
 428
 429         DRM_DEBUG("\n");
 430
 431         drm_proc_cleanup();
 432         if (misc_deregister(&mga_misc)) {
 433                 DRM_ERROR("Cannot unload module\n");
 434         } else {
 435                 DRM_INFO("Module unloaded\n");
 436         }
 437         drm_ctxbitmap_cleanup(dev);
 438         mga_dma_cleanup(dev);
 439 #ifdef CONFIG_MTRR
 440         if(dev->agp && dev->agp->agp_mtrr) {
 441                 int retval;
 442                 retval = mtrr_del(dev->agp->agp_mtrr,
 443                                   dev->agp->agp_info.aper_base,
 444                                   dev->agp->agp_info.aper_size * 1024*1024);
 445                 DRM_DEBUG("mtrr_del = %d\n", retval);
 446         }
 447 #endif
 448
 449         mga_takedown(dev);
 450         if (dev->agp) {
 451                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 452                 dev->agp = NULL;
 453         }
 454 }
 455
 456 int mga_version(struct inode *inode, struct file *filp, unsigned int cmd,
 457                   unsigned long arg)
 458 {
 459         drm_version_t version;
 460         int           len;
 461
 462         copy_from_user_ret(&version,
 463                            (drm_version_t *)arg,
 464                            sizeof(version),
 465                            -EFAULT);
 466
 467 #define DRM_COPY(name,value)                                 \
 468         len = strlen(value);                                 \
 469         if (len > name##_len) len = name##_len;              \
 470         name##_len = strlen(value);                          \
 471         if (len && name) {                                   \
 472                 copy_to_user_ret(name, value, len, -EFAULT); \
 473         }
 474
 475         version.version_major      = MGA_MAJOR;
 476         version.version_minor      = MGA_MINOR;
 477         version.version_patchlevel = MGA_PATCHLEVEL;
 478
 479         DRM_COPY(version.name, MGA_NAME);
 480         DRM_COPY(version.date, MGA_DATE);
 481         DRM_COPY(version.desc, MGA_DESC);
 482
 483         copy_to_user_ret((drm_version_t *)arg,
 484                          &version,
 485                          sizeof(version),
 486                          -EFAULT);
 487         return 0;
 488 }
 489
 490 int mga_open(struct inode *inode, struct file *filp)
 491 {
 492         drm_device_t  *dev    = &mga_device;
 493         int           retcode = 0;
 494
 495         DRM_DEBUG("open_count = %d\n", dev->open_count);
 496         if (!(retcode = drm_open_helper(inode, filp, dev))) {
 497                 MOD_INC_USE_COUNT;
 498                 atomic_inc(&dev->total_open);
 499                 spin_lock(&dev->count_lock);
 500                 if (!dev->open_count++) {
 501                         spin_unlock(&dev->count_lock);
 502                         return mga_setup(dev);
 503                 }
 504                 spin_unlock(&dev->count_lock);
 505         }
 506         return retcode;
 507 }
 508
 509 int mga_release(struct inode *inode, struct file *filp)
 510 {
 511         drm_file_t    *priv   = filp->private_data;
 512         drm_device_t  *dev    = priv->dev;
 513         int           retcode = 0;
 514
 515         DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
 516                   current->pid, dev->device, dev->open_count);
 517
 518         if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
 519             && dev->lock.pid == current->pid) {
 520                 mga_reclaim_buffers(dev, priv->pid);
 521                 DRM_ERROR("Process %d dead, freeing lock for context %d\n",
 522                           current->pid,
 523                           _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 524                 drm_lock_free(dev,
 525                               &dev->lock.hw_lock->lock,
 526                               _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 527
 528                                 /* FIXME: may require heavy-handed reset of
 529                                    hardware at this point, possibly
 530                                    processed via a callback to the X
 531                                    server. */
 532         } else if (dev->lock.hw_lock) {
 533                 /* The lock is required to reclaim buffers */
 534                 DECLARE_WAITQUEUE(entry, current);
 535                 add_wait_queue(&dev->lock.lock_queue, &entry);
 536                 for (;;) {
 537                         if (!dev->lock.hw_lock) {
 538                                 /* Device has been unregistered */
 539                                 retcode = -EINTR;
 540                                 break;
 541                         }
 542                         if (drm_lock_take(&dev->lock.hw_lock->lock,
 543                                           DRM_KERNEL_CONTEXT)) {
 544                                 dev->lock.pid       = priv->pid;
 545                                 dev->lock.lock_time = jiffies;
 546                                 atomic_inc(&dev->total_locks);
 547                                 break;  /* Got lock */
 548                         }
 549                                 /* Contention */
 550                         atomic_inc(&dev->total_sleeps);
 551                         current->state = TASK_INTERRUPTIBLE;
 552                         schedule();
 553                         if (signal_pending(current)) {
 554                                 retcode = -ERESTARTSYS;
 555                                 break;
 556                         }
 557                 }
 558                 current->state = TASK_RUNNING;
 559                 remove_wait_queue(&dev->lock.lock_queue, &entry);
 560                 if(!retcode) {
 561                         mga_reclaim_buffers(dev, priv->pid);
 562                         drm_lock_free(dev, &dev->lock.hw_lock->lock,
 563                                       DRM_KERNEL_CONTEXT);
 564                 }
 565         }
 566         drm_fasync(-1, filp, 0);
 567
 568         down(&dev->struct_sem);
 569         if (priv->prev) priv->prev->next = priv->next;
 570         else            dev->file_first  = priv->next;
 571         if (priv->next) priv->next->prev = priv->prev;
 572         else            dev->file_last   = priv->prev;
 573         up(&dev->struct_sem);
 574
 575         drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
 576         MOD_DEC_USE_COUNT;
 577         atomic_inc(&dev->total_close);
 578         spin_lock(&dev->count_lock);
 579         if (!--dev->open_count) {
 580                 if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 581                         DRM_ERROR("Device busy: %d %d\n",
 582                                   atomic_read(&dev->ioctl_count),
 583                                   dev->blocked);
 584                         spin_unlock(&dev->count_lock);
 585                         return -EBUSY;
 586                 }
 587                 spin_unlock(&dev->count_lock);
 588                 return mga_takedown(dev);
 589         }
 590         spin_unlock(&dev->count_lock);
 591         return retcode;
 592 }
 593
 594
 595 /* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */
 596
 597 int mga_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 598                 unsigned long arg)
 599 {
 600         int              nr      = DRM_IOCTL_NR(cmd);
 601         drm_file_t       *priv   = filp->private_data;
 602         drm_device_t     *dev    = priv->dev;
 603         int              retcode = 0;
 604         drm_ioctl_desc_t *ioctl;
 605         drm_ioctl_t      *func;
 606
 607         atomic_inc(&dev->ioctl_count);
 608         atomic_inc(&dev->total_ioctl);
 609         ++priv->ioctl_count;
 610
 611         DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
 612                   current->pid, cmd, nr, dev->device, priv->authenticated);
 613
 614         if (nr >= MGA_IOCTL_COUNT) {
 615                 retcode = -EINVAL;
 616         } else {
 617                 ioctl     = &mga_ioctls[nr];
 618                 func      = ioctl->func;
 619
 620                 if (!func) {
 621                         DRM_DEBUG("no function\n");
 622                         retcode = -EINVAL;
 623                 } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
 624                             || (ioctl->auth_needed && !priv->authenticated)) {
 625                         retcode = -EACCES;
 626                 } else {
 627                         retcode = (func)(inode, filp, cmd, arg);
 628                 }
 629         }
 630
 631         atomic_dec(&dev->ioctl_count);
 632         return retcode;
 633 }
 634
 635 int mga_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
 636                  unsigned long arg)
 637 {
 638         drm_file_t        *priv   = filp->private_data;
 639         drm_device_t      *dev    = priv->dev;
 640         drm_lock_t        lock;
 641
 642         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 643
 644         if (lock.context == DRM_KERNEL_CONTEXT) {
 645                 DRM_ERROR("Process %d using kernel context %d\n",
 646                           current->pid, lock.context);
 647                 return -EINVAL;
 648         }
 649
 650         DRM_DEBUG("%d frees lock (%d holds)\n",
 651                   lock.context,
 652                   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 653         atomic_inc(&dev->total_unlocks);
 654         if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
 655                 atomic_inc(&dev->total_contends);
 656         drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
 657         mga_dma_schedule(dev, 1);
 658
 659         if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
 660                           DRM_KERNEL_CONTEXT)) {
 661            DRM_ERROR("\n");
 662         }
 663
 664         return 0;
 665 }