drivers/char/drm/tdfx_drv.c

   1 /* tdfx.c -- tdfx driver -*- linux-c -*-
   2  * Created: Thu Oct  7 10:38:32 1999 by faith@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:
  28  *    Rickard E. (Rik) Faith <faith@valinux.com>
  29  *    Daryll Strauss <daryll@valinux.com>
  30  *
  31  */
  32
  33 #include <linux/config.h>
  34 #include "drmP.h"
  35 #include "tdfx_drv.h"
  36
  37 #define TDFX_NAME        "tdfx"
  38 #define TDFX_DESC        "3dfx Banshee/Voodoo3+"
  39 #define TDFX_DATE        "20000719"
  40 #define TDFX_MAJOR       1
  41 #define TDFX_MINOR       0
  42 #define TDFX_PATCHLEVEL  0
  43
  44 static drm_device_t           tdfx_device;
  45 drm_ctx_t                     tdfx_res_ctx;
  46
  47 static struct file_operations tdfx_fops = {
  48 #if LINUX_VERSION_CODE >= 0x020400
  49                                 /* This started being used during 2.4.0-test */
  50         owner:   THIS_MODULE,
  51 #endif
  52         open:    tdfx_open,
  53         flush:   drm_flush,
  54         release: tdfx_release,
  55         ioctl:   tdfx_ioctl,
  56         mmap:    drm_mmap,
  57         read:    drm_read,
  58         fasync:  drm_fasync,
  59         poll:    drm_poll,
  60 };
  61
  62 static struct miscdevice      tdfx_misc = {
  63         minor: MISC_DYNAMIC_MINOR,
  64         name:  TDFX_NAME,
  65         fops:  &tdfx_fops,
  66 };
  67
  68 static drm_ioctl_desc_t       tdfx_ioctls[] = {
  69         [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]    = { tdfx_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_AUTH_MAGIC)] = { drm_authmagic,   1, 1 },
  78         [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]    = { drm_addmap,      1, 1 },
  79
  80         [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]    = { tdfx_addctx,     1, 1 },
  81         [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]     = { tdfx_rmctx,      1, 1 },
  82         [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]    = { tdfx_modctx,     1, 1 },
  83         [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]    = { tdfx_getctx,     1, 0 },
  84         [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = { tdfx_switchctx,  1, 1 },
  85         [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]    = { tdfx_newctx,     1, 1 },
  86         [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]    = { tdfx_resctx,     1, 0 },
  87         [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]   = { drm_adddraw,     1, 1 },
  88         [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]    = { drm_rmdraw,      1, 1 },
  89         [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]       = { tdfx_lock,       1, 0 },
  90         [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]     = { tdfx_unlock,     1, 0 },
  91         [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]     = { drm_finish,      1, 0 },
  92 #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
  93         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)]   = {drm_agp_acquire, 1, 1},
  94         [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)]   = {drm_agp_release, 1, 1},
  95         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]    = {drm_agp_enable,  1, 1},
  96         [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]      = {drm_agp_info,    1, 1},
  97         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]     = {drm_agp_alloc,   1, 1},
  98         [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]      = {drm_agp_free,    1, 1},
  99         [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]      = {drm_agp_unbind,  1, 1},
 100         [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]    = {drm_agp_bind,    1, 1},
 101 #endif
 102 };
 103 #define TDFX_IOCTL_COUNT DRM_ARRAY_SIZE(tdfx_ioctls)
 104
 105 #ifdef MODULE
 106 static char                   *tdfx = NULL;
 107 #endif
 108
 109 MODULE_AUTHOR("VA Linux Systems, Inc.");
 110 MODULE_DESCRIPTION("tdfx");
 111 MODULE_PARM(tdfx, "s");
 112
 113 #ifndef MODULE
 114 /* tdfx_options is called by the kernel to parse command-line options
 115  * passed via the boot-loader (e.g., LILO).  It calls the insmod option
 116  * routine, drm_parse_drm.
 117  */
 118
 119 static int __init tdfx_options(char *str)
 120 {
 121         drm_parse_options(str);
 122         return 1;
 123 }
 124
 125 __setup("tdfx=", tdfx_options);
 126 #endif
 127
 128 static int tdfx_setup(drm_device_t *dev)
 129 {
 130         int i;
 131
 132         atomic_set(&dev->ioctl_count, 0);
 133         atomic_set(&dev->vma_count, 0);
 134         dev->buf_use      = 0;
 135         atomic_set(&dev->buf_alloc, 0);
 136
 137         atomic_set(&dev->total_open, 0);
 138         atomic_set(&dev->total_close, 0);
 139         atomic_set(&dev->total_ioctl, 0);
 140         atomic_set(&dev->total_irq, 0);
 141         atomic_set(&dev->total_ctx, 0);
 142         atomic_set(&dev->total_locks, 0);
 143         atomic_set(&dev->total_unlocks, 0);
 144         atomic_set(&dev->total_contends, 0);
 145         atomic_set(&dev->total_sleeps, 0);
 146
 147         for (i = 0; i < DRM_HASH_SIZE; i++) {
 148                 dev->magiclist[i].head = NULL;
 149                 dev->magiclist[i].tail = NULL;
 150         }
 151         dev->maplist        = NULL;
 152         dev->map_count      = 0;
 153         dev->vmalist        = NULL;
 154         dev->lock.hw_lock   = NULL;
 155         init_waitqueue_head(&dev->lock.lock_queue);
 156         dev->queue_count    = 0;
 157         dev->queue_reserved = 0;
 158         dev->queue_slots    = 0;
 159         dev->queuelist      = NULL;
 160         dev->irq            = 0;
 161         dev->context_flag   = 0;
 162         dev->interrupt_flag = 0;
 163         dev->dma            = 0;
 164         dev->dma_flag       = 0;
 165         dev->last_context   = 0;
 166         dev->last_switch    = 0;
 167         dev->last_checked   = 0;
 168         init_timer(&dev->timer);
 169         init_waitqueue_head(&dev->context_wait);
 170
 171         dev->ctx_start      = 0;
 172         dev->lck_start      = 0;
 173
 174         dev->buf_rp       = dev->buf;
 175         dev->buf_wp       = dev->buf;
 176         dev->buf_end      = dev->buf + DRM_BSZ;
 177         dev->buf_async    = NULL;
 178         init_waitqueue_head(&dev->buf_readers);
 179         init_waitqueue_head(&dev->buf_writers);
 180
 181         tdfx_res_ctx.handle=-1;
 182
 183         DRM_DEBUG("\n");
 184
 185         /* The kernel's context could be created here, but is now created
 186            in drm_dma_enqueue.  This is more resource-efficient for
 187            hardware that does not do DMA, but may mean that
 188            drm_select_queue fails between the time the interrupt is
 189            initialized and the time the queues are initialized. */
 190
 191         return 0;
 192 }
 193
 194
 195 static int tdfx_takedown(drm_device_t *dev)
 196 {
 197         int               i;
 198         drm_magic_entry_t *pt, *next;
 199         drm_map_t         *map;
 200         drm_vma_entry_t   *vma, *vma_next;
 201
 202         DRM_DEBUG("\n");
 203
 204         down(&dev->struct_sem);
 205         del_timer(&dev->timer);
 206
 207         if (dev->devname) {
 208                 drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
 209                 dev->devname = NULL;
 210         }
 211
 212         if (dev->unique) {
 213                 drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
 214                 dev->unique = NULL;
 215                 dev->unique_len = 0;
 216         }
 217                                 /* Clear pid list */
 218         for (i = 0; i < DRM_HASH_SIZE; i++) {
 219                 for (pt = dev->magiclist[i].head; pt; pt = next) {
 220                         next = pt->next;
 221                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 222                 }
 223                 dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
 224         }
 225 #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
 226                                 /* Clear AGP information */
 227         if (dev->agp) {
 228                 drm_agp_mem_t *temp;
 229                 drm_agp_mem_t *temp_next;
 230
 231                 temp = dev->agp->memory;
 232                 while(temp != NULL) {
 233                         temp_next = temp->next;
 234                         drm_free_agp(temp->memory, temp->pages);
 235                         drm_free(temp, sizeof(*temp), DRM_MEM_AGPLISTS);
 236                         temp = temp_next;
 237                 }
 238                 if (dev->agp->acquired) (*drm_agp.release)();
 239         }
 240 #endif
 241                                 /* Clear vma list (only built for debugging) */
 242         if (dev->vmalist) {
 243                 for (vma = dev->vmalist; vma; vma = vma_next) {
 244                         vma_next = vma->next;
 245                         drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 246                 }
 247                 dev->vmalist = NULL;
 248         }
 249
 250                                 /* Clear map area and mtrr information */
 251         if (dev->maplist) {
 252                 for (i = 0; i < dev->map_count; i++) {
 253                         map = dev->maplist[i];
 254                         switch (map->type) {
 255                         case _DRM_REGISTERS:
 256                         case _DRM_FRAME_BUFFER:
 257 #ifdef CONFIG_MTRR
 258                                 if (map->mtrr >= 0) {
 259                                         int retcode;
 260                                         retcode = mtrr_del(map->mtrr,
 261                                                            map->offset,
 262                                                            map->size);
 263                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 264                                 }
 265 #endif
 266                                 drm_ioremapfree(map->handle, map->size);
 267                                 break;
 268                         case _DRM_SHM:
 269                                 drm_free_pages((unsigned long)map->handle,
 270                                                drm_order(map->size)
 271                                                - PAGE_SHIFT,
 272                                                DRM_MEM_SAREA);
 273                                 break;
 274                         case _DRM_AGP:
 275                                 /* Do nothing here, because this is all
 276                                    handled in the AGP/GART driver. */
 277                                 break;
 278                         }
 279                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 280                 }
 281                 drm_free(dev->maplist,
 282                          dev->map_count * sizeof(*dev->maplist),
 283                          DRM_MEM_MAPS);
 284                 dev->maplist   = NULL;
 285                 dev->map_count = 0;
 286         }
 287
 288         if (dev->lock.hw_lock) {
 289                 dev->lock.hw_lock    = NULL; /* SHM removed */
 290                 dev->lock.pid        = 0;
 291                 wake_up_interruptible(&dev->lock.lock_queue);
 292         }
 293         up(&dev->struct_sem);
 294
 295         return 0;
 296 }
 297
 298 /* tdfx_init is called via init_module at module load time, or via
 299  * linux/init/main.c (this is not currently supported). */
 300
 301 static int tdfx_init(void)
 302 {
 303         int                   retcode;
 304         drm_device_t          *dev = &tdfx_device;
 305
 306         DRM_DEBUG("\n");
 307
 308         memset((void *)dev, 0, sizeof(*dev));
 309         dev->count_lock   = SPIN_LOCK_UNLOCKED;
 310         sema_init(&dev->struct_sem, 1);
 311
 312 #ifdef MODULE
 313         drm_parse_options(tdfx);
 314 #endif
 315
 316         if ((retcode = misc_register(&tdfx_misc))) {
 317                 DRM_ERROR("Cannot register \"%s\"\n", TDFX_NAME);
 318                 return retcode;
 319         }
 320         dev->device = MKDEV(MISC_MAJOR, tdfx_misc.minor);
 321         dev->name   = TDFX_NAME;
 322
 323         drm_mem_init();
 324         drm_proc_init(dev);
 325 #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
 326         dev->agp    = drm_agp_init();
 327 #endif
 328         if((retcode = drm_ctxbitmap_init(dev))) {
 329                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 330                 drm_proc_cleanup();
 331                 misc_deregister(&tdfx_misc);
 332                 tdfx_takedown(dev);
 333                 return retcode;
 334         }
 335
 336         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 337                  TDFX_NAME,
 338                  TDFX_MAJOR,
 339                  TDFX_MINOR,
 340                  TDFX_PATCHLEVEL,
 341                  TDFX_DATE,
 342                  tdfx_misc.minor);
 343
 344         return 0;
 345 }
 346
 347 /* tdfx_cleanup is called via cleanup_module at module unload time. */
 348
 349 static void tdfx_cleanup(void)
 350 {
 351         drm_device_t          *dev = &tdfx_device;
 352
 353         DRM_DEBUG("\n");
 354
 355         drm_proc_cleanup();
 356         if (misc_deregister(&tdfx_misc)) {
 357                 DRM_ERROR("Cannot unload module\n");
 358         } else {
 359                 DRM_INFO("Module unloaded\n");
 360         }
 361         drm_ctxbitmap_cleanup(dev);
 362         tdfx_takedown(dev);
 363 #if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
 364         if (dev->agp) {
 365                 drm_agp_uninit();
 366                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 367                 dev->agp = NULL;
 368         }
 369 #endif
 370 }
 371
 372 module_init(tdfx_init);
 373 module_exit(tdfx_cleanup);
 374
 375
 376 int tdfx_version(struct inode *inode, struct file *filp, unsigned int cmd,
 377                   unsigned long arg)
 378 {
 379         drm_version_t version;
 380         int           len;
 381
 382         copy_from_user_ret(&version,
 383                            (drm_version_t *)arg,
 384                            sizeof(version),
 385                            -EFAULT);
 386
 387 #define DRM_COPY(name,value)                                 \
 388         len = strlen(value);                                 \
 389         if (len > name##_len) len = name##_len;              \
 390         name##_len = strlen(value);                          \
 391         if (len && name) {                                   \
 392                 copy_to_user_ret(name, value, len, -EFAULT); \
 393         }
 394
 395         version.version_major      = TDFX_MAJOR;
 396         version.version_minor      = TDFX_MINOR;
 397         version.version_patchlevel = TDFX_PATCHLEVEL;
 398
 399         DRM_COPY(version.name, TDFX_NAME);
 400         DRM_COPY(version.date, TDFX_DATE);
 401         DRM_COPY(version.desc, TDFX_DESC);
 402
 403         copy_to_user_ret((drm_version_t *)arg,
 404                          &version,
 405                          sizeof(version),
 406                          -EFAULT);
 407         return 0;
 408 }
 409
 410 int tdfx_open(struct inode *inode, struct file *filp)
 411 {
 412         drm_device_t  *dev    = &tdfx_device;
 413         int           retcode = 0;
 414
 415         DRM_DEBUG("open_count = %d\n", dev->open_count);
 416         if (!(retcode = drm_open_helper(inode, filp, dev))) {
 417 #if LINUX_VERSION_CODE < 0x020333
 418                 MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
 419 #endif
 420                 atomic_inc(&dev->total_open);
 421                 spin_lock(&dev->count_lock);
 422                 if (!dev->open_count++) {
 423                         spin_unlock(&dev->count_lock);
 424                         return tdfx_setup(dev);
 425                 }
 426                 spin_unlock(&dev->count_lock);
 427         }
 428         return retcode;
 429 }
 430
 431 int tdfx_release(struct inode *inode, struct file *filp)
 432 {
 433         drm_file_t    *priv   = filp->private_data;
 434         drm_device_t  *dev;
 435         int           retcode = 0;
 436
 437         lock_kernel();
 438         dev = priv->dev;
 439
 440         DRM_DEBUG("open_count = %d\n", dev->open_count);
 441         if (!(retcode = drm_release(inode, filp))) {
 442 #if LINUX_VERSION_CODE < 0x020333
 443                 MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
 444 #endif
 445                 atomic_inc(&dev->total_close);
 446                 spin_lock(&dev->count_lock);
 447                 if (!--dev->open_count) {
 448                         if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 449                                 DRM_ERROR("Device busy: %d %d\n",
 450                                           atomic_read(&dev->ioctl_count),
 451                                           dev->blocked);
 452                                 spin_unlock(&dev->count_lock);
 453                                 unlock_kernel();
 454                                 return -EBUSY;
 455                         }
 456                         spin_unlock(&dev->count_lock);
 457                         unlock_kernel();
 458                         return tdfx_takedown(dev);
 459                 }
 460                 spin_unlock(&dev->count_lock);
 461         }
 462
 463         unlock_kernel();
 464         return retcode;
 465 }
 466
 467 /* tdfx_ioctl is called whenever a process performs an ioctl on /dev/drm. */
 468
 469 int tdfx_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 470                 unsigned long arg)
 471 {
 472         int              nr      = DRM_IOCTL_NR(cmd);
 473         drm_file_t       *priv   = filp->private_data;
 474         drm_device_t     *dev    = priv->dev;
 475         int              retcode = 0;
 476         drm_ioctl_desc_t *ioctl;
 477         drm_ioctl_t      *func;
 478
 479         atomic_inc(&dev->ioctl_count);
 480         atomic_inc(&dev->total_ioctl);
 481         ++priv->ioctl_count;
 482
 483         DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
 484                   current->pid, cmd, nr, dev->device, priv->authenticated);
 485
 486         if (nr >= TDFX_IOCTL_COUNT) {
 487                 retcode = -EINVAL;
 488         } else {
 489                 ioctl     = &tdfx_ioctls[nr];
 490                 func      = ioctl->func;
 491
 492                 if (!func) {
 493                         DRM_DEBUG("no function\n");
 494                         retcode = -EINVAL;
 495                 } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
 496                             || (ioctl->auth_needed && !priv->authenticated)) {
 497                         retcode = -EACCES;
 498                 } else {
 499                         retcode = (func)(inode, filp, cmd, arg);
 500                 }
 501         }
 502
 503         atomic_dec(&dev->ioctl_count);
 504         return retcode;
 505 }
 506
 507 int tdfx_lock(struct inode *inode, struct file *filp, unsigned int cmd,
 508               unsigned long arg)
 509 {
 510         drm_file_t        *priv   = filp->private_data;
 511         drm_device_t      *dev    = priv->dev;
 512         DECLARE_WAITQUEUE(entry, current);
 513         int               ret   = 0;
 514         drm_lock_t        lock;
 515 #if DRM_DMA_HISTOGRAM
 516         cycles_t          start;
 517
 518         dev->lck_start = start = get_cycles();
 519 #endif
 520
 521         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 522
 523         if (lock.context == DRM_KERNEL_CONTEXT) {
 524                 DRM_ERROR("Process %d using kernel context %d\n",
 525                           current->pid, lock.context);
 526                 return -EINVAL;
 527         }
 528
 529         DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
 530                   lock.context, current->pid, dev->lock.hw_lock->lock,
 531                   lock.flags);
 532
 533 #if 0
 534                                 /* dev->queue_count == 0 right now for
 535                                    tdfx.  FIXME? */
 536         if (lock.context < 0 || lock.context >= dev->queue_count)
 537                 return -EINVAL;
 538 #endif
 539
 540         if (!ret) {
 541 #if 0
 542                 if (_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)
 543                     != lock.context) {
 544                         long j = jiffies - dev->lock.lock_time;
 545
 546                         if (lock.context == tdfx_res_ctx.handle &&
 547                                 j >= 0 && j < DRM_LOCK_SLICE) {
 548                                 /* Can't take lock if we just had it and
 549                                    there is contention. */
 550                                 DRM_DEBUG("%d (pid %d) delayed j=%d dev=%d jiffies=%d\n",
 551                                         lock.context, current->pid, j,
 552                                         dev->lock.lock_time, jiffies);
 553                                 current->state = TASK_INTERRUPTIBLE;
 554                                 current->policy |= SCHED_YIELD;
 555                                 schedule_timeout(DRM_LOCK_SLICE-j);
 556                                 DRM_DEBUG("jiffies=%d\n", jiffies);
 557                         }
 558                 }
 559 #endif
 560                 add_wait_queue(&dev->lock.lock_queue, &entry);
 561                 for (;;) {
 562                         if (!dev->lock.hw_lock) {
 563                                 /* Device has been unregistered */
 564                                 ret = -EINTR;
 565                                 break;
 566                         }
 567                         if (drm_lock_take(&dev->lock.hw_lock->lock,
 568                                           lock.context)) {
 569                                 dev->lock.pid       = current->pid;
 570                                 dev->lock.lock_time = jiffies;
 571                                 atomic_inc(&dev->total_locks);
 572                                 break;  /* Got lock */
 573                         }
 574
 575                                 /* Contention */
 576                         atomic_inc(&dev->total_sleeps);
 577                         current->state = TASK_INTERRUPTIBLE;
 578 #if 1
 579                         current->policy |= SCHED_YIELD;
 580 #endif
 581                         schedule();
 582                         if (signal_pending(current)) {
 583                                 ret = -ERESTARTSYS;
 584                                 break;
 585                         }
 586                 }
 587                 current->state = TASK_RUNNING;
 588                 remove_wait_queue(&dev->lock.lock_queue, &entry);
 589         }
 590
 591 #if 0
 592         if (!ret && dev->last_context != lock.context &&
 593                 lock.context != tdfx_res_ctx.handle &&
 594                 dev->last_context != tdfx_res_ctx.handle) {
 595                 add_wait_queue(&dev->context_wait, &entry);
 596                 current->state = TASK_INTERRUPTIBLE;
 597                 /* PRE: dev->last_context != lock.context */
 598                 tdfx_context_switch(dev, dev->last_context, lock.context);
 599                 /* POST: we will wait for the context
 600                    switch and will dispatch on a later call
 601                    when dev->last_context == lock.context
 602                    NOTE WE HOLD THE LOCK THROUGHOUT THIS
 603                    TIME! */
 604                 current->policy |= SCHED_YIELD;
 605                 schedule();
 606                 current->state = TASK_RUNNING;
 607                 remove_wait_queue(&dev->context_wait, &entry);
 608                 if (signal_pending(current)) {
 609                         ret = -EINTR;
 610                 } else if (dev->last_context != lock.context) {
 611                         DRM_ERROR("Context mismatch: %d %d\n",
 612                                 dev->last_context, lock.context);
 613                 }
 614         }
 615 #endif
 616
 617         if (!ret) {
 618                 if (lock.flags & _DRM_LOCK_READY) {
 619                                 /* Wait for space in DMA/FIFO */
 620                 }
 621                 if (lock.flags & _DRM_LOCK_QUIESCENT) {
 622                                 /* Make hardware quiescent */
 623 #if 0
 624                         tdfx_quiescent(dev);
 625 #endif
 626                 }
 627         }
 628
 629 #if LINUX_VERSION_CODE < 0x020400
 630         if (lock.context != tdfx_res_ctx.handle) {
 631                 current->counter = 5;
 632                 current->priority = DEF_PRIORITY/4;
 633         }
 634 #endif
 635         DRM_DEBUG("%d %s\n", lock.context, ret ? "interrupted" : "has lock");
 636
 637 #if DRM_DMA_HISTOGRAM
 638         atomic_inc(&dev->histo.lacq[drm_histogram_slot(get_cycles() - start)]);
 639 #endif
 640
 641         return ret;
 642 }
 643
 644
 645 int tdfx_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
 646                  unsigned long arg)
 647 {
 648         drm_file_t        *priv   = filp->private_data;
 649         drm_device_t      *dev    = priv->dev;
 650         drm_lock_t        lock;
 651
 652         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 653
 654         if (lock.context == DRM_KERNEL_CONTEXT) {
 655                 DRM_ERROR("Process %d using kernel context %d\n",
 656                           current->pid, lock.context);
 657                 return -EINVAL;
 658         }
 659
 660         DRM_DEBUG("%d frees lock (%d holds)\n",
 661                   lock.context,
 662                   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 663         atomic_inc(&dev->total_unlocks);
 664         if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
 665                 atomic_inc(&dev->total_contends);
 666         drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
 667                                 /* FIXME: Try to send data to card here */
 668         if (!dev->context_flag) {
 669                 if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
 670                                   DRM_KERNEL_CONTEXT)) {
 671                         DRM_ERROR("\n");
 672                 }
 673         }
 674
 675 #if LINUX_VERSION_CODE < 0x020400
 676         if (lock.context != tdfx_res_ctx.handle) {
 677                 current->counter = 5;
 678                 current->priority = DEF_PRIORITY;
 679         }
 680 #endif
 681
 682         return 0;
 683 }