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         [DRM_IOCTL_NR(DRM_IOCTL_FENCE)] = {drm_fence_ioctl, DRM_AUTH},
 121         [DRM_IOCTL_NR(DRM_IOCTL_BUFOBJ)] = {drm_bo_ioctl, DRM_AUTH},
 122         [DRM_IOCTL_NR(DRM_IOCTL_MM_INIT)] = {drm_mm_init_ioctl,
 123                                              DRM_AUTH },
 124
 125         [DRM_IOCTL_NR(DRM_IOCTL_UPDATE_DRAW)] = {drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 126         [DRM_IOCTL_NR(DRM_IOCTL_MODE_GETRESOURCES)] = {drm_mode_getresources, DRM_MASTER|DRM_ROOT_ONLY},
 127         [DRM_IOCTL_NR(DRM_IOCTL_MODE_GETCRTC)] = {drm_mode_getcrtc, DRM_MASTER|DRM_ROOT_ONLY},
 128         [DRM_IOCTL_NR(DRM_IOCTL_MODE_GETOUTPUT)] = {drm_mode_getoutput, DRM_MASTER|DRM_ROOT_ONLY},
 129         [DRM_IOCTL_NR(DRM_IOCTL_MODE_SETCRTC)] = {drm_mode_setcrtc, DRM_MASTER|DRM_ROOT_ONLY},
 130         [DRM_IOCTL_NR(DRM_IOCTL_MODE_ADDFB)] = {drm_mode_addfb, DRM_MASTER|DRM_ROOT_ONLY},
 131         [DRM_IOCTL_NR(DRM_IOCTL_MODE_RMFB)] = {drm_mode_rmfb, DRM_MASTER|DRM_ROOT_ONLY},
 132         [DRM_IOCTL_NR(DRM_IOCTL_MODE_GETFB)] = {drm_mode_getfb, DRM_MASTER|DRM_ROOT_ONLY},
 133 };
 134
 135 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 136
 137
 138 /**
 139  * Take down the DRM device.
 140  *
 141  * \param dev DRM device structure.
 142  *
 143  * Frees every resource in \p dev.
 144  *
 145  * \sa drm_device
 146  */
 147 int drm_lastclose(drm_device_t * dev)
 148 {
 149         drm_magic_entry_t *pt, *next;
 150         drm_map_list_t *r_list, *r_list_tmp;
 151         drm_vma_entry_t *vma, *vma_next;
 152         int i;
 153
 154         DRM_DEBUG("\n");
 155
 156         /*
 157          * We can't do much about this function failing.
 158          */
 159
 160         if (dev->driver->lastclose)
 161                 dev->driver->lastclose(dev);
 162         DRM_DEBUG("driver lastclose completed\n");
 163
 164         if (dev->unique) {
 165                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 166                 dev->unique=NULL;
 167                 dev->unique_len=0;
 168         }
 169
 170         if (dev->irq_enabled)
 171                 drm_irq_uninstall(dev);
 172
 173         /* Free drawable information memory */
 174         for (i = 0; i < dev->drw_bitfield_length / sizeof(*dev->drw_bitfield);
 175              i++) {
 176                 drm_drawable_info_t *info = drm_get_drawable_info(dev, i);
 177
 178                 if (info) {
 179                         drm_free(info->rects, info->num_rects *
 180                                  sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
 181                         drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 182                 }
 183         }
 184
 185         mutex_lock(&dev->struct_mutex);
 186         del_timer(&dev->timer);
 187
 188         if (dev->unique) {
 189                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 190                 dev->unique = NULL;
 191                 dev->unique_len = 0;
 192         }
 193
 194         if (dev->magicfree.next) {
 195                 list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
 196                         list_del(&pt->head);
 197                         drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
 198                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 199                 }
 200                 drm_ht_remove(&dev->magiclist);
 201         }
 202
 203
 204         /* Clear AGP information */
 205         if (drm_core_has_AGP(dev) && dev->agp) {
 206                 drm_agp_mem_t *entry;
 207                 drm_agp_mem_t *nexte;
 208
 209                 /* Remove AGP resources, but leave dev->agp
 210                    intact until drv_cleanup is called. */
 211                 for (entry = dev->agp->memory; entry; entry = nexte) {
 212                         nexte = entry->next;
 213                         if (entry->bound)
 214                                 drm_unbind_agp(entry->memory);
 215                         drm_free_agp(entry->memory, entry->pages);
 216                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 217                 }
 218                 dev->agp->memory = NULL;
 219
 220                 if (dev->agp->acquired)
 221                         drm_agp_release(dev);
 222
 223                 dev->agp->acquired = 0;
 224                 dev->agp->enabled = 0;
 225         }
 226         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
 227                 drm_sg_cleanup(dev->sg);
 228                 dev->sg = NULL;
 229         }
 230
 231         /* Clear vma list (only built for debugging) */
 232         if (dev->vmalist) {
 233                 for (vma = dev->vmalist; vma; vma = vma_next) {
 234                         vma_next = vma->next;
 235                         drm_ctl_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 236                 }
 237                 dev->vmalist = NULL;
 238         }
 239
 240         if (dev->maplist) {
 241                 list_for_each_entry_safe(r_list, r_list_tmp, &dev->maplist->head, head) {
 242                         if (!(r_list->map->flags & _DRM_DRIVER))
 243                                 drm_rmmap_locked(dev, r_list->map);
 244                 }
 245         }
 246
 247         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
 248                 for (i = 0; i < dev->queue_count; i++) {
 249
 250                         if (dev->queuelist[i]) {
 251                                 drm_free(dev->queuelist[i],
 252                                          sizeof(*dev->queuelist[0]),
 253                                          DRM_MEM_QUEUES);
 254                                 dev->queuelist[i] = NULL;
 255                         }
 256                 }
 257                 drm_free(dev->queuelist,
 258                          dev->queue_slots * sizeof(*dev->queuelist),
 259                          DRM_MEM_QUEUES);
 260                 dev->queuelist = NULL;
 261         }
 262         dev->queue_count = 0;
 263
 264         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
 265                 drm_dma_takedown(dev);
 266
 267         if (dev->lock.filp) {
 268                 dev->lock.filp = NULL;
 269                 wake_up_interruptible(&dev->lock.lock_queue);
 270         }
 271         dev->dev_mapping = NULL;
 272         mutex_unlock(&dev->struct_mutex);
 273
 274         DRM_DEBUG("lastclose completed\n");
 275         return 0;
 276 }
 277
 278 void drm_cleanup_pci(struct pci_dev *pdev)
 279 {
 280         drm_device_t *dev = pci_get_drvdata(pdev);
 281
 282         pci_set_drvdata(pdev, NULL);
 283         pci_release_regions(pdev);
 284         if (dev)
 285                 drm_cleanup(dev);
 286 }
 287 EXPORT_SYMBOL(drm_cleanup_pci);
 288
 289 /**
 290  * Module initialization. Called via init_module at module load time, or via
 291  * linux/init/main.c (this is not currently supported).
 292  *
 293  * \return zero on success or a negative number on failure.
 294  *
 295  * Initializes an array of drm_device structures, and attempts to
 296  * initialize all available devices, using consecutive minors, registering the
 297  * stubs and initializing the AGP device.
 298  *
 299  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 300  * after the initialization for driver customization.
 301  */
 302 int drm_init(struct drm_driver *driver,
 303                        struct pci_device_id *pciidlist)
 304 {
 305         struct pci_dev *pdev;
 306         struct pci_device_id *pid;
 307         int rc, i;
 308
 309         DRM_DEBUG("\n");
 310
 311         for (i = 0; (pciidlist[i].vendor != 0) && !drm_fb_loaded; i++) {
 312                 pid = &pciidlist[i];
 313
 314                 pdev = NULL;
 315                 /* pass back in pdev to account for multiple identical cards */
 316                 while ((pdev =
 317                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 318                                        pid->subdevice, pdev))) {
 319                         /* is there already a driver loaded, or (short circuit saves work) */
 320                         /* does something like VesaFB have control of the memory region? */
 321                         if (pci_dev_driver(pdev)
 322                             || pci_request_regions(pdev, "DRM scan")) {
 323                                 /* go into stealth mode */
 324                                 drm_fb_loaded = 1;
 325                                 pci_dev_put(pdev);
 326                                 break;
 327                         }
 328                         /* no fbdev or vesadev, put things back and wait for normal probe */
 329                         pci_release_regions(pdev);
 330                 }
 331         }
 332
 333         if (!drm_fb_loaded)
 334                 pci_register_driver(&driver->pci_driver);
 335         else {
 336                 for (i = 0; pciidlist[i].vendor != 0; i++) {
 337                         pid = &pciidlist[i];
 338
 339                         pdev = NULL;
 340                         /* pass back in pdev to account for multiple identical cards */
 341                         while ((pdev =
 342                                 pci_get_subsys(pid->vendor, pid->device,
 343                                                pid->subvendor, pid->subdevice,
 344                                                pdev))) {
 345                                 /* stealth mode requires a manual probe */
 346                                 pci_dev_get(pdev);
 347                                 if ((rc = drm_get_dev(pdev, &pciidlist[i], driver))) {
 348                                         pci_dev_put(pdev);
 349                                         return rc;
 350                                 }
 351                         }
 352                 }
 353                 DRM_INFO("Used old pci detect: framebuffer loaded\n");
 354         }
 355         return 0;
 356 }
 357 EXPORT_SYMBOL(drm_init);
 358
 359 /**
 360  * Called via cleanup_module() at module unload time.
 361  *
 362  * Cleans up all DRM device, calling drm_lastclose().
 363  *
 364  * \sa drm_init
 365  */
 366 static void drm_cleanup(drm_device_t * dev)
 367 {
 368
 369         DRM_DEBUG("\n");
 370         if (!dev) {
 371                 DRM_ERROR("cleanup called no dev\n");
 372                 return;
 373         }
 374
 375         drm_lastclose(dev);
 376         drm_fence_manager_takedown(dev);
 377
 378         drm_ctxbitmap_cleanup(dev);
 379
 380         if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && dev->agp
 381             && dev->agp->agp_mtrr >= 0) {
 382                 int retval;
 383                 retval = mtrr_del(dev->agp->agp_mtrr,
 384                                   dev->agp->agp_info.aper_base,
 385                                   dev->agp->agp_info.aper_size * 1024 * 1024);
 386                 DRM_DEBUG("mtrr_del=%d\n", retval);
 387         }
 388
 389         if (dev->driver->unload)
 390                 dev->driver->unload(dev);
 391
 392         if (drm_core_has_AGP(dev) && dev->agp) {
 393                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 394                 dev->agp = NULL;
 395         }
 396
 397
 398         //      drm_bo_driver_finish(dev);
 399         if (dev->maplist) {
 400                 drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
 401                 dev->maplist = NULL;
 402                 drm_ht_remove(&dev->map_hash);
 403                 drm_mm_takedown(&dev->offset_manager);
 404                 drm_ht_remove(&dev->object_hash);
 405         }
 406
 407         if (!drm_fb_loaded)
 408                 pci_disable_device(dev->pdev);
 409
 410         drm_put_head(&dev->primary);
 411         if (drm_put_dev(dev))
 412                 DRM_ERROR("Cannot unload module\n");
 413 }
 414
 415 void drm_exit(struct drm_driver *driver)
 416 {
 417         int i;
 418         drm_device_t *dev = NULL;
 419         drm_head_t *head;
 420
 421         DRM_DEBUG("\n");
 422         if (drm_fb_loaded) {
 423                 for (i = 0; i < drm_cards_limit; i++) {
 424                         head = drm_heads[i];
 425                         if (!head)
 426                                 continue;
 427                         if (!head->dev)
 428                                 continue;
 429                         if (head->dev->driver != driver)
 430                                 continue;
 431                         dev = head->dev;
 432                         if (dev) {
 433                                 /* release the pci driver */
 434                                 if (dev->pdev)
 435                                         pci_dev_put(dev->pdev);
 436                                 drm_cleanup(dev);
 437                         }
 438                 }
 439         } else
 440                 pci_unregister_driver(&driver->pci_driver);
 441 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
 442         free_nopage_retry();
 443 #endif
 444         DRM_INFO("Module unloaded\n");
 445 }
 446 EXPORT_SYMBOL(drm_exit);
 447
 448 /** File operations structure */
 449 static const struct file_operations drm_stub_fops = {
 450         .owner = THIS_MODULE,
 451         .open = drm_stub_open
 452 };
 453
 454 static int __init drm_core_init(void)
 455 {
 456         int ret;
 457         struct sysinfo si;
 458         unsigned long avail_memctl_mem;
 459         unsigned long max_memctl_mem;
 460
 461         si_meminfo(&si);
 462
 463         /*
 464          * AGP only allows low / DMA32 memory ATM.
 465          */
 466
 467         avail_memctl_mem = si.totalram - si.totalhigh;
 468
 469         /*
 470          * Avoid overflows
 471          */
 472
 473         max_memctl_mem = 1UL << (32 - PAGE_SHIFT);
 474         max_memctl_mem = (max_memctl_mem / si.mem_unit) * PAGE_SIZE;
 475
 476         if (avail_memctl_mem >= max_memctl_mem)
 477                 avail_memctl_mem = max_memctl_mem;
 478
 479         drm_init_memctl(avail_memctl_mem/2, avail_memctl_mem*3/4, si.mem_unit);
 480
 481         ret = -ENOMEM;
 482         drm_cards_limit =
 483             (drm_cards_limit < DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
 484         drm_heads = drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
 485         if (!drm_heads)
 486                 goto err_p1;
 487
 488         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 489                 goto err_p1;
 490
 491         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 492         if (IS_ERR(drm_class)) {
 493                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 494                 ret = PTR_ERR(drm_class);
 495                 goto err_p2;
 496         }
 497
 498         drm_proc_root = proc_mkdir("dri", NULL);
 499         if (!drm_proc_root) {
 500                 DRM_ERROR("Cannot create /proc/dri\n");
 501                 ret = -1;
 502                 goto err_p3;
 503         }
 504
 505         drm_mem_init();
 506
 507         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 508                  CORE_NAME,
 509                  CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 510         return 0;
 511 err_p3:
 512         drm_sysfs_destroy(drm_class);
 513 err_p2:
 514         unregister_chrdev(DRM_MAJOR, "drm");
 515         drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
 516 err_p1:
 517         return ret;
 518 }
 519
 520 static void __exit drm_core_exit(void)
 521 {
 522         remove_proc_entry("dri", NULL);
 523         drm_sysfs_destroy(drm_class);
 524
 525         unregister_chrdev(DRM_MAJOR, "drm");
 526
 527         drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
 528 }
 529
 530 module_init(drm_core_init);
 531 module_exit(drm_core_exit);
 532
 533 /**
 534  * Get version information
 535  *
 536  * \param inode device inode.
 537  * \param filp file pointer.
 538  * \param cmd command.
 539  * \param arg user argument, pointing to a drm_version structure.
 540  * \return zero on success or negative number on failure.
 541  *
 542  * Fills in the version information in \p arg.
 543  */
 544 static int drm_version(struct inode *inode, struct file *filp,
 545                 unsigned int cmd, unsigned long arg)
 546 {
 547         drm_file_t *priv = filp->private_data;
 548         drm_device_t *dev = priv->head->dev;
 549         drm_version_t __user *argp = (void __user *)arg;
 550         drm_version_t version;
 551         int len;
 552
 553         if (copy_from_user(&version, argp, sizeof(version)))
 554                 return -EFAULT;
 555
 556         version.version_major = dev->driver->major;
 557         version.version_minor = dev->driver->minor;
 558         version.version_patchlevel = dev->driver->patchlevel;
 559         DRM_COPY(version.name, dev->driver->name);
 560         DRM_COPY(version.date, dev->driver->date);
 561         DRM_COPY(version.desc, dev->driver->desc);
 562
 563         if (copy_to_user(argp, &version, sizeof(version)))
 564                 return -EFAULT;
 565         return 0;
 566 }
 567
 568 /**
 569  * Called whenever a process performs an ioctl on /dev/drm.
 570  *
 571  * \param inode device inode.
 572  * \param filp file pointer.
 573  * \param cmd command.
 574  * \param arg user argument.
 575  * \return zero on success or negative number on failure.
 576  *
 577  * Looks up the ioctl function in the ::ioctls table, checking for root
 578  * previleges if so required, and dispatches to the respective function.
 579  */
 580 int drm_ioctl(struct inode *inode, struct file *filp,
 581               unsigned int cmd, unsigned long arg)
 582 {
 583         drm_file_t *priv = filp->private_data;
 584         drm_device_t *dev = priv->head->dev;
 585         drm_ioctl_desc_t *ioctl;
 586         drm_ioctl_t *func;
 587         unsigned int nr = DRM_IOCTL_NR(cmd);
 588         int retcode = -EINVAL;
 589
 590         atomic_inc(&dev->ioctl_count);
 591         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 592         ++priv->ioctl_count;
 593
 594         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 595                   current->pid, cmd, nr, (long)old_encode_dev(priv->head->device),
 596                   priv->authenticated);
 597
 598         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 599             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 600                 goto err_i1;
 601         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END)
 602                 && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 603                         ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 604         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE))
 605                 ioctl = &drm_ioctls[nr];
 606         else
 607                 goto err_i1;
 608
 609         func = ioctl->func;
 610         /* is there a local override? */
 611         if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
 612                 func = dev->driver->dma_ioctl;
 613
 614         if (!func) {
 615                 DRM_DEBUG("no function\n");
 616                 retcode = -EINVAL;
 617         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 618                    ((ioctl->flags & DRM_AUTH) && !priv->authenticated) ||
 619                    ((ioctl->flags & DRM_MASTER) && !priv->master)) {
 620                 retcode = -EACCES;
 621         } else {
 622                 retcode = func(inode, filp, cmd, arg);
 623         }
 624 err_i1:
 625         atomic_dec(&dev->ioctl_count);
 626         if (retcode)
 627                 DRM_DEBUG("ret = %x\n", retcode);
 628         return retcode;
 629 }
 630 EXPORT_SYMBOL(drm_ioctl);