linux/gamma_drv.c

   1 /* gamma.c -- 3dlabs GMX 2000 driver -*- linux-c -*-
   2  * Created: Mon Jan  4 08:58:31 1999 by faith@precisioninsight.com
   3  * Revised: Tue Oct 12 08:51:36 1999 by faith@precisioninsight.com
   4  *
   5  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   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  * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/gamma_drv.c,v 1.4 2000/02/23 04:47:28 martin Exp $
  28  *
  29  */
  30
  31 #define EXPORT_SYMTAB
  32 #include "drmP.h"
  33 #include "gamma_drv.h"
  34 EXPORT_SYMBOL(gamma_init);
  35 EXPORT_SYMBOL(gamma_cleanup);
  36
  37 #define GAMMA_NAME       "gamma"
  38 #define GAMMA_DESC       "3dlabs GMX 2000"
  39 #define GAMMA_DATE       "19990830"
  40 #define GAMMA_MAJOR      0
  41 #define GAMMA_MINOR      0
  42 #define GAMMA_PATCHLEVEL 5
  43
  44 static drm_device_t           gamma_device;
  45
  46 static struct file_operations gamma_fops = {
  47         open:    gamma_open,
  48         flush:   drm_flush,
  49         release: gamma_release,
  50         ioctl:   gamma_ioctl,
  51         mmap:    drm_mmap,
  52         read:    drm_read,
  53         fasync:  drm_fasync,
  54         poll:    drm_poll,
  55 };
  56
  57 static struct miscdevice      gamma_misc = {
  58         minor: MISC_DYNAMIC_MINOR,
  59         name:  GAMMA_NAME,
  60         fops:  &gamma_fops,
  61 };
  62
  63 static drm_ioctl_desc_t       gamma_ioctls[] = {
  64         [DRM_IOCTL_NR(DRM_IOCTL_VERSION)]    = { gamma_version,   0, 0 },
  65         [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = { drm_getunique,   0, 0 },
  66         [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]  = { drm_getmagic,    0, 0 },
  67         [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]  = { drm_irq_busid,   0, 1 },
  68
  69         [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = { drm_setunique,   1, 1 },
  70         [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]      = { drm_block,       1, 1 },
  71         [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]    = { drm_unblock,     1, 1 },
  72         [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]    = { gamma_control,   1, 1 },
  73         [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = { drm_authmagic,   1, 1 },
  74         [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]    = { drm_addmap,      1, 1 },
  75         [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]   = { drm_addbufs,     1, 1 },
  76         [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]  = { drm_markbufs,    1, 1 },
  77         [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]  = { drm_infobufs,    1, 0 },
  78         [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]   = { drm_mapbufs,     1, 0 },
  79         [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]  = { drm_freebufs,    1, 0 },
  80
  81         [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]    = { drm_addctx,      1, 1 },
  82         [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]     = { drm_rmctx,       1, 1 },
  83         [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]    = { drm_modctx,      1, 1 },
  84         [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]    = { drm_getctx,      1, 0 },
  85         [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = { drm_switchctx,   1, 1 },
  86         [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]    = { drm_newctx,      1, 1 },
  87         [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]    = { drm_resctx,      1, 0 },
  88         [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]   = { drm_adddraw,     1, 1 },
  89         [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]    = { drm_rmdraw,      1, 1 },
  90         [DRM_IOCTL_NR(DRM_IOCTL_DMA)]        = { gamma_dma,       1, 0 },
  91         [DRM_IOCTL_NR(DRM_IOCTL_LOCK)]       = { gamma_lock,      1, 0 },
  92         [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]     = { gamma_unlock,    1, 0 },
  93         [DRM_IOCTL_NR(DRM_IOCTL_FINISH)]     = { drm_finish,      1, 0 },
  94 };
  95 #define GAMMA_IOCTL_COUNT DRM_ARRAY_SIZE(gamma_ioctls)
  96
  97 #ifdef MODULE
  98 int                           init_module(void);
  99 void                          cleanup_module(void);
 100 static char                   *gamma = NULL;
 101
 102 MODULE_AUTHOR("Precision Insight, Inc., Cedar Park, Texas.");
 103 MODULE_DESCRIPTION("3dlabs GMX 2000");
 104 MODULE_PARM(gamma, "s");
 105
 106 /* init_module is called when insmod is used to load the module */
 107
 108 int init_module(void)
 109 {
 110         return gamma_init();
 111 }
 112
 113 /* cleanup_module is called when rmmod is used to unload the module */
 114
 115 void cleanup_module(void)
 116 {
 117         gamma_cleanup();
 118 }
 119 #endif
 120
 121 #ifndef MODULE
 122 /* gamma_setup is called by the kernel to parse command-line options passed
 123  * via the boot-loader (e.g., LILO).  It calls the insmod option routine,
 124  * drm_parse_drm.
 125  *
 126  * This is not currently supported, since it requires changes to
 127  * linux/init/main.c. */
 128
 129
 130 void __init gamma_setup(char *str, int *ints)
 131 {
 132         if (ints[0] != 0) {
 133                 DRM_ERROR("Illegal command line format, ignored\n");
 134                 return;
 135         }
 136         drm_parse_options(str);
 137 }
 138 #endif
 139
 140 static int gamma_setup(drm_device_t *dev)
 141 {
 142         int i;
 143
 144         atomic_set(&dev->ioctl_count, 0);
 145         atomic_set(&dev->vma_count, 0);
 146         dev->buf_use      = 0;
 147         atomic_set(&dev->buf_alloc, 0);
 148
 149         drm_dma_setup(dev);
 150
 151         atomic_set(&dev->total_open, 0);
 152         atomic_set(&dev->total_close, 0);
 153         atomic_set(&dev->total_ioctl, 0);
 154         atomic_set(&dev->total_irq, 0);
 155         atomic_set(&dev->total_ctx, 0);
 156         atomic_set(&dev->total_locks, 0);
 157         atomic_set(&dev->total_unlocks, 0);
 158         atomic_set(&dev->total_contends, 0);
 159         atomic_set(&dev->total_sleeps, 0);
 160
 161         for (i = 0; i < DRM_HASH_SIZE; i++) {
 162                 dev->magiclist[i].head = NULL;
 163                 dev->magiclist[i].tail = NULL;
 164         }
 165         dev->maplist        = NULL;
 166         dev->map_count      = 0;
 167         dev->vmalist        = NULL;
 168         dev->lock.hw_lock   = NULL;
 169         init_waitqueue_head(&dev->lock.lock_queue);
 170         dev->queue_count    = 0;
 171         dev->queue_reserved = 0;
 172         dev->queue_slots    = 0;
 173         dev->queuelist      = NULL;
 174         dev->irq            = 0;
 175         dev->context_flag   = 0;
 176         dev->interrupt_flag = 0;
 177         dev->dma_flag       = 0;
 178         dev->last_context   = 0;
 179         dev->last_switch    = 0;
 180         dev->last_checked   = 0;
 181         init_timer(&dev->timer);
 182         init_waitqueue_head(&dev->context_wait);
 183 #if DRM_DMA_HISTO
 184         memset(&dev->histo, 0, sizeof(dev->histo));
 185 #endif
 186         dev->ctx_start      = 0;
 187         dev->lck_start      = 0;
 188
 189         dev->buf_rp       = dev->buf;
 190         dev->buf_wp       = dev->buf;
 191         dev->buf_end      = dev->buf + DRM_BSZ;
 192         dev->buf_async    = NULL;
 193         init_waitqueue_head(&dev->buf_readers);
 194         init_waitqueue_head(&dev->buf_writers);
 195
 196         DRM_DEBUG("\n");
 197
 198         /* The kernel's context could be created here, but is now created
 199            in drm_dma_enqueue.  This is more resource-efficient for
 200            hardware that does not do DMA, but may mean that
 201            drm_select_queue fails between the time the interrupt is
 202            initialized and the time the queues are initialized. */
 203
 204         return 0;
 205 }
 206
 207
 208 static int gamma_takedown(drm_device_t *dev)
 209 {
 210         int               i;
 211         drm_magic_entry_t *pt, *next;
 212         drm_map_t         *map;
 213         drm_vma_entry_t   *vma, *vma_next;
 214
 215         DRM_DEBUG("\n");
 216
 217         if (dev->irq) gamma_irq_uninstall(dev);
 218
 219         down(&dev->struct_sem);
 220         del_timer(&dev->timer);
 221
 222         if (dev->devname) {
 223                 drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
 224                 dev->devname = NULL;
 225         }
 226
 227         if (dev->unique) {
 228                 drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
 229                 dev->unique = NULL;
 230                 dev->unique_len = 0;
 231         }
 232                                 /* Clear pid list */
 233         for (i = 0; i < DRM_HASH_SIZE; i++) {
 234                 for (pt = dev->magiclist[i].head; pt; pt = next) {
 235                         next = pt->next;
 236                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 237                 }
 238                 dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
 239         }
 240
 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->queuelist) {
 289                 for (i = 0; i < dev->queue_count; i++) {
 290                         drm_waitlist_destroy(&dev->queuelist[i]->waitlist);
 291                         if (dev->queuelist[i]) {
 292                                 drm_free(dev->queuelist[i],
 293                                          sizeof(*dev->queuelist[0]),
 294                                          DRM_MEM_QUEUES);
 295                                 dev->queuelist[i] = NULL;
 296                         }
 297                 }
 298                 drm_free(dev->queuelist,
 299                          dev->queue_slots * sizeof(*dev->queuelist),
 300                          DRM_MEM_QUEUES);
 301                 dev->queuelist   = NULL;
 302         }
 303
 304         drm_dma_takedown(dev);
 305
 306         dev->queue_count     = 0;
 307         if (dev->lock.hw_lock) {
 308                 dev->lock.hw_lock    = NULL; /* SHM removed */
 309                 dev->lock.pid        = 0;
 310                 wake_up_interruptible(&dev->lock.lock_queue);
 311         }
 312         up(&dev->struct_sem);
 313
 314         return 0;
 315 }
 316
 317 /* gamma_init is called via init_module at module load time, or via
 318  * linux/init/main.c (this is not currently supported). */
 319
 320 int gamma_init(void)
 321 {
 322         int                   retcode;
 323         drm_device_t          *dev = &gamma_device;
 324
 325         DRM_DEBUG("\n");
 326
 327         memset((void *)dev, 0, sizeof(*dev));
 328         dev->count_lock   = SPIN_LOCK_UNLOCKED;
 329         sema_init(&dev->struct_sem, 1);
 330
 331 #ifdef MODULE
 332         drm_parse_options(gamma);
 333 #endif
 334
 335         if ((retcode = misc_register(&gamma_misc))) {
 336                 DRM_ERROR("Cannot register \"%s\"\n", GAMMA_NAME);
 337                 return retcode;
 338         }
 339         dev->device = MKDEV(MISC_MAJOR, gamma_misc.minor);
 340         dev->name   = GAMMA_NAME;
 341
 342         drm_mem_init();
 343         drm_proc_init(dev);
 344
 345         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 346                  GAMMA_NAME,
 347                  GAMMA_MAJOR,
 348                  GAMMA_MINOR,
 349                  GAMMA_PATCHLEVEL,
 350                  GAMMA_DATE,
 351                  gamma_misc.minor);
 352
 353         return 0;
 354 }
 355
 356 /* gamma_cleanup is called via cleanup_module at module unload time. */
 357
 358 void gamma_cleanup(void)
 359 {
 360         drm_device_t          *dev = &gamma_device;
 361
 362         DRM_DEBUG("\n");
 363
 364         drm_proc_cleanup();
 365         if (misc_deregister(&gamma_misc)) {
 366                 DRM_ERROR("Cannot unload module\n");
 367         } else {
 368                 DRM_INFO("Module unloaded\n");
 369         }
 370         gamma_takedown(dev);
 371 }
 372
 373 int gamma_version(struct inode *inode, struct file *filp, unsigned int cmd,
 374                   unsigned long arg)
 375 {
 376         drm_version_t version;
 377         int           len;
 378
 379         copy_from_user_ret(&version,
 380                            (drm_version_t *)arg,
 381                            sizeof(version),
 382                            -EFAULT);
 383
 384 #define DRM_COPY(name,value)                                 \
 385         len = strlen(value);                                 \
 386         if (len > name##_len) len = name##_len;              \
 387         name##_len = strlen(value);                          \
 388         if (len && name) {                                   \
 389                 copy_to_user_ret(name, value, len, -EFAULT); \
 390         }
 391
 392         version.version_major      = GAMMA_MAJOR;
 393         version.version_minor      = GAMMA_MINOR;
 394         version.version_patchlevel = GAMMA_PATCHLEVEL;
 395
 396         DRM_COPY(version.name, GAMMA_NAME);
 397         DRM_COPY(version.date, GAMMA_DATE);
 398         DRM_COPY(version.desc, GAMMA_DESC);
 399
 400         copy_to_user_ret((drm_version_t *)arg,
 401                          &version,
 402                          sizeof(version),
 403                          -EFAULT);
 404         return 0;
 405 }
 406
 407 int gamma_open(struct inode *inode, struct file *filp)
 408 {
 409         drm_device_t  *dev    = &gamma_device;
 410         int           retcode = 0;
 411
 412         DRM_DEBUG("open_count = %d\n", dev->open_count);
 413         if (!(retcode = drm_open_helper(inode, filp, dev))) {
 414                 MOD_INC_USE_COUNT;
 415                 atomic_inc(&dev->total_open);
 416                 spin_lock(&dev->count_lock);
 417                 if (!dev->open_count++) {
 418                         spin_unlock(&dev->count_lock);
 419                         return gamma_setup(dev);
 420                 }
 421                 spin_unlock(&dev->count_lock);
 422         }
 423         return retcode;
 424 }
 425
 426 int gamma_release(struct inode *inode, struct file *filp)
 427 {
 428         drm_file_t    *priv   = filp->private_data;
 429         drm_device_t  *dev    = priv->dev;
 430         int           retcode = 0;
 431
 432         DRM_DEBUG("open_count = %d\n", dev->open_count);
 433         if (!(retcode = drm_release(inode, filp))) {
 434                 MOD_DEC_USE_COUNT;
 435                 atomic_inc(&dev->total_close);
 436                 spin_lock(&dev->count_lock);
 437                 if (!--dev->open_count) {
 438                         if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 439                                 DRM_ERROR("Device busy: %d %d\n",
 440                                           atomic_read(&dev->ioctl_count),
 441                                           dev->blocked);
 442                                 spin_unlock(&dev->count_lock);
 443                                 return -EBUSY;
 444                         }
 445                         spin_unlock(&dev->count_lock);
 446                         return gamma_takedown(dev);
 447                 }
 448                 spin_unlock(&dev->count_lock);
 449         }
 450         return retcode;
 451 }
 452
 453 /* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */
 454
 455 int gamma_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 456                 unsigned long arg)
 457 {
 458         int              nr      = DRM_IOCTL_NR(cmd);
 459         drm_file_t       *priv   = filp->private_data;
 460         drm_device_t     *dev    = priv->dev;
 461         int              retcode = 0;
 462         drm_ioctl_desc_t *ioctl;
 463         drm_ioctl_t      *func;
 464
 465         atomic_inc(&dev->ioctl_count);
 466         atomic_inc(&dev->total_ioctl);
 467         ++priv->ioctl_count;
 468
 469         DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
 470                   current->pid, cmd, nr, dev->device, priv->authenticated);
 471
 472         if (nr >= GAMMA_IOCTL_COUNT) {
 473                 retcode = -EINVAL;
 474         } else {
 475                 ioctl     = &gamma_ioctls[nr];
 476                 func      = ioctl->func;
 477
 478                 if (!func) {
 479                         DRM_DEBUG("no function\n");
 480                         retcode = -EINVAL;
 481                 } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
 482                             || (ioctl->auth_needed && !priv->authenticated)) {
 483                         retcode = -EACCES;
 484                 } else {
 485                         retcode = (func)(inode, filp, cmd, arg);
 486                 }
 487         }
 488
 489         atomic_dec(&dev->ioctl_count);
 490         return retcode;
 491 }
 492
 493
 494 int gamma_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
 495                  unsigned long arg)
 496 {
 497         drm_file_t        *priv   = filp->private_data;
 498         drm_device_t      *dev    = priv->dev;
 499         drm_lock_t        lock;
 500
 501         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 502
 503         if (lock.context == DRM_KERNEL_CONTEXT) {
 504                 DRM_ERROR("Process %d using kernel context %d\n",
 505                           current->pid, lock.context);
 506                 return -EINVAL;
 507         }
 508
 509         DRM_DEBUG("%d frees lock (%d holds)\n",
 510                   lock.context,
 511                   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 512         atomic_inc(&dev->total_unlocks);
 513         if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
 514                 atomic_inc(&dev->total_contends);
 515         drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
 516         gamma_dma_schedule(dev, 1);
 517         if (!dev->context_flag) {
 518                 if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
 519                                   DRM_KERNEL_CONTEXT)) {
 520                         DRM_ERROR("\n");
 521                 }
 522         }
 523 #if DRM_DMA_HISTOGRAM
 524         atomic_inc(&dev->histo.lhld[drm_histogram_slot(get_cycles()
 525                                                        - dev->lck_start)]);
 526 #endif
 527
 528         return 0;
 529 }