drivers/char/drm/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: Fri Aug 20 22:48:11 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  * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/generic/gamma_drv.c,v 1.17 1999/08/30 13:05:00 faith Exp $
  28  * $XFree86$
  29  *
  30  */
  31
  32 #define EXPORT_SYMTAB
  33 #include "drmP.h"
  34 #include "gamma_drv.h"
  35 EXPORT_SYMBOL(gamma_init);
  36 EXPORT_SYMBOL(gamma_cleanup);
  37
  38 #define GAMMA_NAME       "gamma"
  39 #define GAMMA_DESC       "3dlabs GMX 2000"
  40 #define GAMMA_DATE       "19990830"
  41 #define GAMMA_MAJOR      0
  42 #define GAMMA_MINOR      0
  43 #define GAMMA_PATCHLEVEL 5
  44
  45 static drm_device_t           gamma_device;
  46
  47 static struct file_operations gamma_fops = {
  48         open:    gamma_open,
  49         flush:   drm_flush,
  50         release: gamma_release,
  51         ioctl:   gamma_ioctl,
  52         mmap:    drm_mmap,
  53         read:    drm_read,
  54         fasync:  drm_fasync,
  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                         }
 275                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 276                 }
 277                 drm_free(dev->maplist,
 278                          dev->map_count * sizeof(*dev->maplist),
 279                          DRM_MEM_MAPS);
 280                 dev->maplist   = NULL;
 281                 dev->map_count = 0;
 282         }
 283
 284         if (dev->queuelist) {
 285                 for (i = 0; i < dev->queue_count; i++) {
 286                         drm_waitlist_destroy(&dev->queuelist[i]->waitlist);
 287                         if (dev->queuelist[i]) {
 288                                 drm_free(dev->queuelist[i],
 289                                          sizeof(*dev->queuelist[0]),
 290                                          DRM_MEM_QUEUES);
 291                                 dev->queuelist[i] = NULL;
 292                         }
 293                 }
 294                 drm_free(dev->queuelist,
 295                          dev->queue_slots * sizeof(*dev->queuelist),
 296                          DRM_MEM_QUEUES);
 297                 dev->queuelist   = NULL;
 298         }
 299
 300         drm_dma_takedown(dev);
 301
 302         dev->queue_count     = 0;
 303         if (dev->lock.hw_lock) {
 304                 dev->lock.hw_lock    = NULL; /* SHM removed */
 305                 dev->lock.pid        = 0;
 306                 wake_up_interruptible(&dev->lock.lock_queue);
 307         }
 308         up(&dev->struct_sem);
 309
 310         return 0;
 311 }
 312
 313 /* gamma_init is called via init_module at module load time, or via
 314  * linux/init/main.c (this is not currently supported). */
 315
 316 int gamma_init(void)
 317 {
 318         int                   retcode;
 319         drm_device_t          *dev = &gamma_device;
 320
 321         DRM_DEBUG("\n");
 322
 323         memset((void *)dev, 0, sizeof(*dev));
 324         dev->count_lock   = SPIN_LOCK_UNLOCKED;
 325         sema_init(&dev->struct_sem, 1);
 326
 327 #ifdef MODULE
 328         drm_parse_options(gamma);
 329 #endif
 330
 331         if ((retcode = misc_register(&gamma_misc))) {
 332                 DRM_ERROR("Cannot register \"%s\"\n", GAMMA_NAME);
 333                 return retcode;
 334         }
 335         dev->device = MKDEV(MISC_MAJOR, gamma_misc.minor);
 336         dev->name   = GAMMA_NAME;
 337
 338         drm_mem_init();
 339         drm_proc_init(dev);
 340
 341         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 342                  GAMMA_NAME,
 343                  GAMMA_MAJOR,
 344                  GAMMA_MINOR,
 345                  GAMMA_PATCHLEVEL,
 346                  GAMMA_DATE,
 347                  gamma_misc.minor);
 348
 349         return 0;
 350 }
 351
 352 /* gamma_cleanup is called via cleanup_module at module unload time. */
 353
 354 void gamma_cleanup(void)
 355 {
 356         drm_device_t          *dev = &gamma_device;
 357
 358         DRM_DEBUG("\n");
 359
 360         drm_proc_cleanup();
 361         if (misc_deregister(&gamma_misc)) {
 362                 DRM_ERROR("Cannot unload module\n");
 363         } else {
 364                 DRM_INFO("Module unloaded\n");
 365         }
 366         gamma_takedown(dev);
 367 }
 368
 369 int gamma_version(struct inode *inode, struct file *filp, unsigned int cmd,
 370                   unsigned long arg)
 371 {
 372         drm_version_t version;
 373         int           len;
 374
 375         copy_from_user_ret(&version,
 376                            (drm_version_t *)arg,
 377                            sizeof(version),
 378                            -EFAULT);
 379
 380 #define DRM_COPY(name,value)                                 \
 381         len = strlen(value);                                 \
 382         if (len > name##_len) len = name##_len;              \
 383         name##_len = strlen(value);                          \
 384         if (len && name) {                                   \
 385                 copy_to_user_ret(name, value, len, -EFAULT); \
 386         }
 387
 388         version.version_major      = GAMMA_MAJOR;
 389         version.version_minor      = GAMMA_MINOR;
 390         version.version_patchlevel = GAMMA_PATCHLEVEL;
 391
 392         DRM_COPY(version.name, GAMMA_NAME);
 393         DRM_COPY(version.date, GAMMA_DATE);
 394         DRM_COPY(version.desc, GAMMA_DESC);
 395
 396         copy_to_user_ret((drm_version_t *)arg,
 397                          &version,
 398                          sizeof(version),
 399                          -EFAULT);
 400         return 0;
 401 }
 402
 403 int gamma_open(struct inode *inode, struct file *filp)
 404 {
 405         drm_device_t  *dev    = &gamma_device;
 406         int           retcode = 0;
 407
 408         DRM_DEBUG("open_count = %d\n", dev->open_count);
 409         if (!(retcode = drm_open_helper(inode, filp, dev))) {
 410                 MOD_INC_USE_COUNT;
 411                 atomic_inc(&dev->total_open);
 412                 spin_lock(&dev->count_lock);
 413                 if (!dev->open_count++) {
 414                         spin_unlock(&dev->count_lock);
 415                         return gamma_setup(dev);
 416                 }
 417                 spin_unlock(&dev->count_lock);
 418         }
 419         return retcode;
 420 }
 421
 422 int gamma_release(struct inode *inode, struct file *filp)
 423 {
 424         drm_file_t    *priv   = filp->private_data;
 425         drm_device_t  *dev    = priv->dev;
 426         int           retcode = 0;
 427
 428         DRM_DEBUG("open_count = %d\n", dev->open_count);
 429         if (!(retcode = drm_release(inode, filp))) {
 430                 MOD_DEC_USE_COUNT;
 431                 atomic_inc(&dev->total_close);
 432                 spin_lock(&dev->count_lock);
 433                 if (!--dev->open_count) {
 434                         if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 435                                 DRM_ERROR("Device busy: %d %d\n",
 436                                           atomic_read(&dev->ioctl_count),
 437                                           dev->blocked);
 438                                 spin_unlock(&dev->count_lock);
 439                                 return -EBUSY;
 440                         }
 441                         spin_unlock(&dev->count_lock);
 442                         return gamma_takedown(dev);
 443                 }
 444                 spin_unlock(&dev->count_lock);
 445         }
 446         return retcode;
 447 }
 448
 449 /* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */
 450
 451 int gamma_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 452                 unsigned long arg)
 453 {
 454         int              nr      = DRM_IOCTL_NR(cmd);
 455         drm_file_t       *priv   = filp->private_data;
 456         drm_device_t     *dev    = priv->dev;
 457         int              retcode = 0;
 458         drm_ioctl_desc_t *ioctl;
 459         drm_ioctl_t      *func;
 460
 461         atomic_inc(&dev->ioctl_count);
 462         atomic_inc(&dev->total_ioctl);
 463         ++priv->ioctl_count;
 464
 465         DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
 466                   current->pid, cmd, nr, dev->device, priv->authenticated);
 467
 468         if (nr >= GAMMA_IOCTL_COUNT) {
 469                 retcode = -EINVAL;
 470         } else {
 471                 ioctl     = &gamma_ioctls[nr];
 472                 func      = ioctl->func;
 473
 474                 if (!func) {
 475                         DRM_DEBUG("no function\n");
 476                         retcode = -EINVAL;
 477                 } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
 478                             || (ioctl->auth_needed && !priv->authenticated)) {
 479                         retcode = -EACCES;
 480                 } else {
 481                         retcode = (func)(inode, filp, cmd, arg);
 482                 }
 483         }
 484
 485         atomic_dec(&dev->ioctl_count);
 486         return retcode;
 487 }
 488
 489
 490 int gamma_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
 491                  unsigned long arg)
 492 {
 493         drm_file_t        *priv   = filp->private_data;
 494         drm_device_t      *dev    = priv->dev;
 495         drm_lock_t        lock;
 496
 497         copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
 498
 499         if (lock.context == DRM_KERNEL_CONTEXT) {
 500                 DRM_ERROR("Process %d using kernel context %d\n",
 501                           current->pid, lock.context);
 502                 return -EINVAL;
 503         }
 504
 505         DRM_DEBUG("%d frees lock (%d holds)\n",
 506                   lock.context,
 507                   _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 508         atomic_inc(&dev->total_unlocks);
 509         if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
 510                 atomic_inc(&dev->total_contends);
 511         drm_lock_transfer(&dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
 512         gamma_dma_schedule(dev, 1);
 513         if (!dev->context_flag) {
 514                 if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
 515                                   DRM_KERNEL_CONTEXT)) {
 516                         DRM_ERROR("\n");
 517                 }
 518         }
 519 #if DRM_DMA_HISTOGRAM
 520         atomic_inc(&dev->histo.lhld[drm_histogram_slot(get_cycles()
 521                                                        - dev->lck_start)]);
 522 #endif
 523
 524         return 0;
 525 }