linux-core/drm_drv.c

   1 /**
   2  * \file drm_drv.c
   3  * Generic driver template
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  *
   8  * To use this template, you must at least define the following (samples
   9  * given for the MGA driver):
  10  *
  11  * \code
  12  * #define DRIVER_AUTHOR        "VA Linux Systems, Inc."
  13  *
  14  * #define DRIVER_NAME          "mga"
  15  * #define DRIVER_DESC          "Matrox G200/G400"
  16  * #define DRIVER_DATE          "20001127"
  17  *
  18  * #define drm_x                mga_##x
  19  * \endcode
  20  */
  21
  22 /*
  23  * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
  24  *
  25  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  26  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  27  * All Rights Reserved.
  28  *
  29  * Permission is hereby granted, free of charge, to any person obtaining a
  30  * copy of this software and associated documentation files (the "Software"),
  31  * to deal in the Software without restriction, including without limitation
  32  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  33  * and/or sell copies of the Software, and to permit persons to whom the
  34  * Software is furnished to do so, subject to the following conditions:
  35  *
  36  * The above copyright notice and this permission notice (including the next
  37  * paragraph) shall be included in all copies or substantial portions of the
  38  * Software.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  41  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  42  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  43  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  44  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  45  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  46  * OTHER DEALINGS IN THE SOFTWARE.
  47  */
  48 #include "drmP.h"
  49 #include "drm_core.h"
  50
  51 static void drm_cleanup(drm_device_t * dev);
  52 int drm_fb_loaded = 0;
  53
  54 static int drm_version(struct inode *inode, struct file *filp,
  55                 unsigned int cmd, unsigned long arg);
  56
  57 /** Ioctl table */
  58 static drm_ioctl_desc_t drm_ioctls[] = {
  59         [DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = {drm_version, 0},
  60         [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = {drm_getunique, 0},
  61         [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = {drm_getmagic, 0},
  62         [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = {drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY},
  63         [DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)] = {drm_getmap, 0},
  64         [DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)] = {drm_getclient, 0},
  65         [DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)] = {drm_getstats, 0},
  66         [DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)] = {drm_setversion, DRM_MASTER|DRM_ROOT_ONLY},
  67
  68         [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = {drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  69         [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  70         [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  71         [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = {drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  72
  73         [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = {drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  74         [DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)] = {drm_rmmap_ioctl, DRM_AUTH},
  75
  76         [DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = {drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  77         [DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = {drm_getsareactx, DRM_AUTH},
  78
  79         [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = {drm_addctx, DRM_AUTH|DRM_ROOT_ONLY},
  80         [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = {drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  81         [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = {drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  82         [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = {drm_getctx, DRM_AUTH},
  83         [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = {drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  84         [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = {drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  85         [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = {drm_resctx, DRM_AUTH},
  86
  87         [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = {drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  88         [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = {drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  89
  90         [DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = {drm_lock, DRM_AUTH},
  91         [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = {drm_unlock, DRM_AUTH},
  92
  93         [DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = {drm_noop, DRM_AUTH},
  94
  95         [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)] = {drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  96         [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)] = {drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
  97         [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)] = {drm_infobufs, DRM_AUTH},
  98         [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)] = {drm_mapbufs, DRM_AUTH},
  99         [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)] = {drm_freebufs, DRM_AUTH},
 100         /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
 101         [DRM_IOCTL_NR(DRM_IOCTL_DMA)] = {NULL, DRM_AUTH},
 102
 103         [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)] = {drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 104
 105 #if __OS_HAS_AGP
 106         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 107         [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 108         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 109         [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info_ioctl, DRM_AUTH},
 110         [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 111         [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 112         [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 113         [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 114 #endif
 115
 116         [DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)] = {drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 117         [DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)] = {drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 118
 119         [DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)] = {drm_wait_vblank, 0},
 120
 121         [DRM_IOCTL_NR(DRM_IOCTL_BUFOBJ)] = {drm_bo_ioctl, DRM_AUTH},
 122
 123         [DRM_IOCTL_NR(DRM_IOCTL_UPDATE_DRAW)] = {drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 124
 125
 126         [DRM_IOCTL_NR(DRM_IOCTL_MM_INIT)] = {drm_mm_init_ioctl,
 127                                              DRM_AUTH },
 128         [DRM_IOCTL_NR(DRM_IOCTL_MM_TAKEDOWN)] = {drm_mm_takedown_ioctl,
 129                                              DRM_AUTH },
 130         [DRM_IOCTL_NR(DRM_IOCTL_MM_LOCK)] = {drm_mm_lock_ioctl,
 131                                              DRM_AUTH },
 132         [DRM_IOCTL_NR(DRM_IOCTL_MM_UNLOCK)] = {drm_mm_unlock_ioctl,
 133                                              DRM_AUTH },
 134
 135         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_CREATE)] = {drm_fence_create_ioctl, DRM_AUTH},
 136         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_DESTROY)] = {drm_fence_destroy_ioctl, DRM_AUTH},
 137         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_REFERENCE)] = {drm_fence_reference_ioctl, DRM_AUTH},
 138         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_UNREFERENCE)] = {drm_fence_unreference_ioctl, DRM_AUTH},
 139         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_SIGNALED)] = {drm_fence_signaled_ioctl, DRM_AUTH},
 140         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_FLUSH)] = {drm_fence_flush_ioctl, DRM_AUTH},
 141         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_WAIT)] = {drm_fence_wait_ioctl, DRM_AUTH},
 142         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_EMIT)] = {drm_fence_emit_ioctl, DRM_AUTH},
 143         [DRM_IOCTL_NR(DRM_IOCTL_FENCE_BUFFERS)] = {drm_fence_buffers_ioctl, DRM_AUTH},
 144
 145 };
 146
 147 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 148
 149
 150 /**
 151  * Take down the DRM device.
 152  *
 153  * \param dev DRM device structure.
 154  *
 155  * Frees every resource in \p dev.
 156  *
 157  * \sa drm_device
 158  */
 159 int drm_lastclose(drm_device_t * dev)
 160 {
 161         drm_magic_entry_t *pt, *next;
 162         drm_map_list_t *r_list, *list_t;
 163         drm_vma_entry_t *vma, *vma_temp;
 164         int i;
 165
 166         DRM_DEBUG("\n");
 167
 168         /*
 169          * We can't do much about this function failing.
 170          */
 171
 172         drm_bo_driver_finish(dev);
 173
 174         if (dev->driver->lastclose)
 175                 dev->driver->lastclose(dev);
 176         DRM_DEBUG("driver lastclose completed\n");
 177
 178         if (dev->unique) {
 179                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 180                 dev->unique=NULL;
 181                 dev->unique_len=0;
 182         }
 183
 184         if (dev->irq_enabled)
 185                 drm_irq_uninstall(dev);
 186
 187         /* Free drawable information memory */
 188         for (i = 0; i < dev->drw_bitfield_length / sizeof(*dev->drw_bitfield);
 189              i++) {
 190                 drm_drawable_info_t *info = drm_get_drawable_info(dev, i);
 191
 192                 if (info) {
 193                         drm_free(info->rects, info->num_rects *
 194                                  sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 195                         drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 196                 }
 197         }
 198
 199         mutex_lock(&dev->struct_mutex);
 200         del_timer(&dev->timer);
 201
 202         if (dev->unique) {
 203                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 204                 dev->unique = NULL;
 205                 dev->unique_len = 0;
 206         }
 207
 208         if (dev->magicfree.next) {
 209                 list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
 210                         list_del(&pt->head);
 211                         drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
 212                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 213                 }
 214                 drm_ht_remove(&dev->magiclist);
 215         }
 216
 217
 218         /* Clear AGP information */
 219         if (drm_core_has_AGP(dev) && dev->agp) {
 220                 drm_agp_mem_t *entry, *tempe;
 221
 222                 /* Remove AGP resources, but leave dev->agp
 223                    intact until drv_cleanup is called. */
 224                 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 225                         if (entry->bound)
 226                                 drm_unbind_agp(entry->memory);
 227                         drm_free_agp(entry->memory, entry->pages);
 228                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 229                 }
 230                 INIT_LIST_HEAD(&dev->agp->memory);
 231
 232                 if (dev->agp->acquired)
 233                         drm_agp_release(dev);
 234
 235                 dev->agp->acquired = 0;
 236                 dev->agp->enabled = 0;
 237         }
 238         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
 239                 drm_sg_cleanup(dev->sg);
 240                 dev->sg = NULL;
 241         }
 242
 243         /* Clear vma list (only built for debugging) */
 244         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 245                 list_del(&vma->head);
 246                 drm_ctl_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 247         }
 248
 249         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 250                 drm_rmmap_locked(dev, r_list->map);
 251                 r_list = NULL;
 252         }
 253
 254         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
 255                 for (i = 0; i < dev->queue_count; i++) {
 256
 257                         if (dev->queuelist[i]) {
 258                                 drm_free(dev->queuelist[i],
 259                                          sizeof(*dev->queuelist[0]),
 260                                          DRM_MEM_QUEUES);
 261                                 dev->queuelist[i] = NULL;
 262                         }
 263                 }
 264                 drm_free(dev->queuelist,
 265                          dev->queue_slots * sizeof(*dev->queuelist),
 266                          DRM_MEM_QUEUES);
 267                 dev->queuelist = NULL;
 268         }
 269         dev->queue_count = 0;
 270
 271         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
 272                 drm_dma_takedown(dev);
 273
 274         if (dev->lock.hw_lock) {
 275                 dev->sigdata.lock = dev->lock.hw_lock = NULL;   /* SHM removed */
 276                 dev->lock.filp = NULL;
 277                 wake_up_interruptible(&dev->lock.lock_queue);
 278         }
 279         dev->dev_mapping = NULL;
 280         mutex_unlock(&dev->struct_mutex);
 281
 282         DRM_DEBUG("lastclose completed\n");
 283         return 0;
 284 }
 285
 286 void drm_cleanup_pci(struct pci_dev *pdev)
 287 {
 288         drm_device_t *dev = pci_get_drvdata(pdev);
 289
 290         pci_set_drvdata(pdev, NULL);
 291         pci_release_regions(pdev);
 292         if (dev)
 293                 drm_cleanup(dev);
 294 }
 295 EXPORT_SYMBOL(drm_cleanup_pci);
 296
 297 /**
 298  * Module initialization. Called via init_module at module load time, or via
 299  * linux/init/main.c (this is not currently supported).
 300  *
 301  * \return zero on success or a negative number on failure.
 302  *
 303  * Initializes an array of drm_device structures, and attempts to
 304  * initialize all available devices, using consecutive minors, registering the
 305  * stubs and initializing the AGP device.
 306  *
 307  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 308  * after the initialization for driver customization.
 309  */
 310 int drm_init(struct drm_driver *driver,
 311                        struct pci_device_id *pciidlist)
 312 {
 313         struct pci_dev *pdev;
 314         struct pci_device_id *pid;
 315         int rc, i;
 316
 317         DRM_DEBUG("\n");
 318
 319         for (i = 0; (pciidlist[i].vendor != 0) && !drm_fb_loaded; i++) {
 320                 pid = &pciidlist[i];
 321
 322                 pdev = NULL;
 323                 /* pass back in pdev to account for multiple identical cards */
 324                 while ((pdev =
 325                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 326                                        pid->subdevice, pdev))) {
 327                         /* is there already a driver loaded, or (short circuit saves work) */
 328                         /* does something like VesaFB have control of the memory region? */
 329                         if (pci_dev_driver(pdev)
 330                             || pci_request_regions(pdev, "DRM scan")) {
 331                                 /* go into stealth mode */
 332                                 drm_fb_loaded = 1;
 333                                 pci_dev_put(pdev);
 334                                 break;
 335                         }
 336                         /* no fbdev or vesadev, put things back and wait for normal probe */
 337                         pci_release_regions(pdev);
 338                 }
 339         }
 340
 341         if (!drm_fb_loaded)
 342                 pci_register_driver(&driver->pci_driver);
 343         else {
 344                 for (i = 0; pciidlist[i].vendor != 0; i++) {
 345                         pid = &pciidlist[i];
 346
 347                         pdev = NULL;
 348                         /* pass back in pdev to account for multiple identical cards */
 349                         while ((pdev =
 350                                 pci_get_subsys(pid->vendor, pid->device,
 351                                                pid->subvendor, pid->subdevice,
 352                                                pdev))) {
 353                                 /* stealth mode requires a manual probe */
 354                                 pci_dev_get(pdev);
 355                                 if ((rc = drm_get_dev(pdev, &pciidlist[i], driver))) {
 356                                         pci_dev_put(pdev);
 357                                         return rc;
 358                                 }
 359                         }
 360                 }
 361                 DRM_INFO("Used old pci detect: framebuffer loaded\n");
 362         }
 363         return 0;
 364 }
 365 EXPORT_SYMBOL(drm_init);
 366
 367 /**
 368  * Called via cleanup_module() at module unload time.
 369  *
 370  * Cleans up all DRM device, calling drm_lastclose().
 371  *
 372  * \sa drm_init
 373  */
 374 static void drm_cleanup(drm_device_t * dev)
 375 {
 376
 377         DRM_DEBUG("\n");
 378         if (!dev) {
 379                 DRM_ERROR("cleanup called no dev\n");
 380                 return;
 381         }
 382
 383         drm_lastclose(dev);
 384         drm_fence_manager_takedown(dev);
 385
 386         drm_ht_remove(&dev->map_hash);
 387         drm_mm_takedown(&dev->offset_manager);
 388         drm_ht_remove(&dev->object_hash);
 389
 390         if (!drm_fb_loaded)
 391                 pci_disable_device(dev->pdev);
 392
 393         drm_ctxbitmap_cleanup(dev);
 394
 395         if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && dev->agp
 396             && dev->agp->agp_mtrr >= 0) {
 397                 int retval;
 398                 retval = mtrr_del(dev->agp->agp_mtrr,
 399                                   dev->agp->agp_info.aper_base,
 400                                   dev->agp->agp_info.aper_size * 1024 * 1024);
 401                 DRM_DEBUG("mtrr_del=%d\n", retval);
 402         }
 403
 404         if (drm_core_has_AGP(dev) && dev->agp) {
 405                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 406                 dev->agp = NULL;
 407         }
 408         if (dev->driver->unload)
 409                 dev->driver->unload(dev);
 410
 411         drm_put_head(&dev->primary);
 412         if (drm_put_dev(dev))
 413                 DRM_ERROR("Cannot unload module\n");
 414 }
 415
 416 void drm_exit(struct drm_driver *driver)
 417 {
 418         int i;
 419         drm_device_t *dev = NULL;
 420         drm_head_t *head;
 421
 422         DRM_DEBUG("\n");
 423         if (drm_fb_loaded) {
 424                 for (i = 0; i < drm_cards_limit; i++) {
 425                         head = drm_heads[i];
 426                         if (!head)
 427                                 continue;
 428                         if (!head->dev)
 429                                 continue;
 430                         if (head->dev->driver != driver)
 431                                 continue;
 432                         dev = head->dev;
 433                         if (dev) {
 434                                 /* release the pci driver */
 435                                 if (dev->pdev)
 436                                         pci_dev_put(dev->pdev);
 437                                 drm_cleanup(dev);
 438                         }
 439                 }
 440         } else
 441                 pci_unregister_driver(&driver->pci_driver);
 442 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
 443         free_nopage_retry();
 444 #endif
 445         DRM_INFO("Module unloaded\n");
 446 }
 447 EXPORT_SYMBOL(drm_exit);
 448
 449 /** File operations structure */
 450 static const struct file_operations drm_stub_fops = {
 451         .owner = THIS_MODULE,
 452         .open = drm_stub_open
 453 };
 454
 455 static int __init drm_core_init(void)
 456 {
 457         int ret;
 458         struct sysinfo si;
 459         unsigned long avail_memctl_mem;
 460         unsigned long max_memctl_mem;
 461
 462         si_meminfo(&si);
 463
 464         /*
 465          * AGP only allows low / DMA32 memory ATM.
 466          */
 467
 468         avail_memctl_mem = si.totalram - si.totalhigh;
 469
 470         /*
 471          * Avoid overflows
 472          */
 473
 474         max_memctl_mem = 1UL << (32 - PAGE_SHIFT);
 475         max_memctl_mem = (max_memctl_mem / si.mem_unit) * PAGE_SIZE;
 476
 477         if (avail_memctl_mem >= max_memctl_mem)
 478                 avail_memctl_mem = max_memctl_mem;
 479
 480         drm_init_memctl(avail_memctl_mem/2, avail_memctl_mem*3/4, si.mem_unit);
 481
 482         ret = -ENOMEM;
 483         drm_cards_limit =
 484             (drm_cards_limit < DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
 485         drm_heads = drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
 486         if (!drm_heads)
 487                 goto err_p1;
 488
 489         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 490                 goto err_p1;
 491
 492         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 493         if (IS_ERR(drm_class)) {
 494                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 495                 ret = PTR_ERR(drm_class);
 496                 goto err_p2;
 497         }
 498
 499         drm_proc_root = proc_mkdir("dri", NULL);
 500         if (!drm_proc_root) {
 501                 DRM_ERROR("Cannot create /proc/dri\n");
 502                 ret = -1;
 503                 goto err_p3;
 504         }
 505
 506         drm_mem_init();
 507
 508         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 509                  CORE_NAME,
 510                  CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 511         return 0;
 512 err_p3:
 513         drm_sysfs_destroy(drm_class);
 514 err_p2:
 515         unregister_chrdev(DRM_MAJOR, "drm");
 516         drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
 517 err_p1:
 518         return ret;
 519 }
 520
 521 static void __exit drm_core_exit(void)
 522 {
 523         remove_proc_entry("dri", NULL);
 524         drm_sysfs_destroy(drm_class);
 525
 526         unregister_chrdev(DRM_MAJOR, "drm");
 527
 528         drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
 529 }
 530
 531 module_init(drm_core_init);
 532 module_exit(drm_core_exit);
 533
 534 /**
 535  * Get version information
 536  *
 537  * \param inode device inode.
 538  * \param filp file pointer.
 539  * \param cmd command.
 540  * \param arg user argument, pointing to a drm_version structure.
 541  * \return zero on success or negative number on failure.
 542  *
 543  * Fills in the version information in \p arg.
 544  */
 545 static int drm_version(struct inode *inode, struct file *filp,
 546                 unsigned int cmd, unsigned long arg)
 547 {
 548         drm_file_t *priv = filp->private_data;
 549         drm_device_t *dev = priv->head->dev;
 550         drm_version_t __user *argp = (void __user *)arg;
 551         drm_version_t version;
 552         int len;
 553
 554         if (copy_from_user(&version, argp, sizeof(version)))
 555                 return -EFAULT;
 556
 557         version.version_major = dev->driver->major;
 558         version.version_minor = dev->driver->minor;
 559         version.version_patchlevel = dev->driver->patchlevel;
 560         DRM_COPY(version.name, dev->driver->name);
 561         DRM_COPY(version.date, dev->driver->date);
 562         DRM_COPY(version.desc, dev->driver->desc);
 563
 564         if (copy_to_user(argp, &version, sizeof(version)))
 565                 return -EFAULT;
 566         return 0;
 567 }
 568
 569 /**
 570  * Called whenever a process performs an ioctl on /dev/drm.
 571  *
 572  * \param inode device inode.
 573  * \param filp file pointer.
 574  * \param cmd command.
 575  * \param arg user argument.
 576  * \return zero on success or negative number on failure.
 577  *
 578  * Looks up the ioctl function in the ::ioctls table, checking for root
 579  * previleges if so required, and dispatches to the respective function.
 580  */
 581 int drm_ioctl(struct inode *inode, struct file *filp,
 582               unsigned int cmd, unsigned long arg)
 583 {
 584         drm_file_t *priv = filp->private_data;
 585         drm_device_t *dev = priv->head->dev;
 586         drm_ioctl_desc_t *ioctl;
 587         drm_ioctl_t *func;
 588         unsigned int nr = DRM_IOCTL_NR(cmd);
 589         int retcode = -EINVAL;
 590
 591         atomic_inc(&dev->ioctl_count);
 592         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 593         ++priv->ioctl_count;
 594
 595         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 596                   current->pid, cmd, nr, (long)old_encode_dev(priv->head->device),
 597                   priv->authenticated);
 598
 599         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 600             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 601                 goto err_i1;
 602         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END)
 603                 && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 604                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 605         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE))
 606                 ioctl = &drm_ioctls[nr];
 607         else
 608                 goto err_i1;
 609
 610         func = ioctl->func;
 611         /* is there a local override? */
 612         if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
 613                 func = dev->driver->dma_ioctl;
 614
 615         if (!func) {
 616                 DRM_DEBUG("no function\n");
 617                 retcode = -EINVAL;
 618         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 619                    ((ioctl->flags & DRM_AUTH) && !priv->authenticated) ||
 620                    ((ioctl->flags & DRM_MASTER) && !priv->master)) {
 621                 retcode = -EACCES;
 622         } else {
 623                 retcode = func(inode, filp, cmd, arg);
 624         }
 625 err_i1:
 626         atomic_dec(&dev->ioctl_count);
 627         if (retcode)
 628                 DRM_DEBUG("ret = %x\n", retcode);
 629         return retcode;
 630 }
 631 EXPORT_SYMBOL(drm_ioctl);
 632
 633 int drm_wait_on(drm_device_t *dev, wait_queue_head_t *queue, int timeout,
 634                 int (*fn)(drm_device_t *dev, void *priv), void *priv)
 635 {
 636         DECLARE_WAITQUEUE(entry, current);
 637         unsigned long end = jiffies + (timeout);
 638         int ret = 0;
 639         add_wait_queue(queue, &entry);
 640
 641         for (;;) {
 642                 __set_current_state(TASK_INTERRUPTIBLE);
 643                 if ((*fn)(dev, priv))
 644                         break;
 645                 if (time_after_eq(jiffies, end)) {
 646                         ret = -EBUSY;
 647                         break;
 648                 }
 649                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);
 650                 if (signal_pending(current)) {
 651                         ret = -EINTR;
 652                         break;
 653                 }
 654         }
 655         __set_current_state(TASK_RUNNING);
 656         remove_wait_queue(queue, &entry);
 657         return ret;
 658 }
 659 EXPORT_SYMBOL(drm_wait_on);
 660
 661 drm_local_map_t *drm_getsarea(struct drm_device *dev)
 662 {
 663         drm_map_list_t *entry;
 664
 665         list_for_each_entry(entry, &dev->maplist, head) {
 666                 if (entry->map && entry->map->type == _DRM_SHM &&
 667                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
 668                         return entry->map;
 669                 }
 670         }
 671         return NULL;
 672 }
 673 EXPORT_SYMBOL(drm_getsarea);