drivers/gpu/drm/drm_stub.c

   1 /**
   2  * \file drm_stub.h
   3  * Stub support
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  */
   7
   8 /*
   9  * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
  10  *
  11  * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice (including the next
  22  * paragraph) shall be included in all copies or substantial portions of the
  23  * Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  31  * DEALINGS IN THE SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include "drmP.h"
  37 #include "drm_core.h"
  38
  39 unsigned int drm_debug = 0;     /* 1 to enable debug output */
  40 EXPORT_SYMBOL(drm_debug);
  41
  42 MODULE_AUTHOR(CORE_AUTHOR);
  43 MODULE_DESCRIPTION(CORE_DESC);
  44 MODULE_LICENSE("GPL and additional rights");
  45 MODULE_PARM_DESC(debug, "Enable debug output");
  46
  47 module_param_named(debug, drm_debug, int, 0600);
  48
  49 struct idr drm_minors_idr;
  50
  51 struct class *drm_class;
  52 struct proc_dir_entry *drm_proc_root;
  53
  54 static int drm_minor_get_id(struct drm_device *dev, int type)
  55 {
  56         int new_id;
  57         int ret;
  58         int base = 0, limit = 63;
  59
  60         if (type == DRM_MINOR_CONTROL) {
  61                 base += 64;
  62                 limit = base + 127;
  63         } else if (type == DRM_MINOR_RENDER) {
  64                 base += 128;
  65                 limit = base + 255;
  66         }
  67
  68 again:
  69         if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
  70                 DRM_ERROR("Out of memory expanding drawable idr\n");
  71                 return -ENOMEM;
  72         }
  73         mutex_lock(&dev->struct_mutex);
  74         ret = idr_get_new_above(&drm_minors_idr, NULL,
  75                                 base, &new_id);
  76         mutex_unlock(&dev->struct_mutex);
  77         if (ret == -EAGAIN) {
  78                 goto again;
  79         } else if (ret) {
  80                 return ret;
  81         }
  82
  83         if (new_id >= limit) {
  84                 idr_remove(&drm_minors_idr, new_id);
  85                 return -EINVAL;
  86         }
  87         return new_id;
  88 }
  89
  90 struct drm_master *drm_master_create(struct drm_minor *minor)
  91 {
  92         struct drm_master *master;
  93
  94         master = drm_calloc(1, sizeof(*master), DRM_MEM_DRIVER);
  95         if (!master)
  96                 return NULL;
  97
  98         kref_init(&master->refcount);
  99         spin_lock_init(&master->lock.spinlock);
 100         init_waitqueue_head(&master->lock.lock_queue);
 101         drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
 102         INIT_LIST_HEAD(&master->magicfree);
 103         master->minor = minor;
 104
 105         list_add_tail(&master->head, &minor->master_list);
 106
 107         return master;
 108 }
 109
 110 struct drm_master *drm_master_get(struct drm_master *master)
 111 {
 112         kref_get(&master->refcount);
 113         return master;
 114 }
 115
 116 static void drm_master_destroy(struct kref *kref)
 117 {
 118         struct drm_master *master = container_of(kref, struct drm_master, refcount);
 119         struct drm_magic_entry *pt, *next;
 120         struct drm_device *dev = master->minor->dev;
 121         struct drm_map_list *r_list, *list_temp;
 122
 123         list_del(&master->head);
 124
 125         if (dev->driver->master_destroy)
 126                 dev->driver->master_destroy(dev, master);
 127
 128         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 129                 if (r_list->master == master) {
 130                         drm_rmmap_locked(dev, r_list->map);
 131                         r_list = NULL;
 132                 }
 133         }
 134
 135         if (master->unique) {
 136                 drm_free(master->unique, master->unique_size, DRM_MEM_DRIVER);
 137                 master->unique = NULL;
 138                 master->unique_len = 0;
 139         }
 140
 141         list_for_each_entry_safe(pt, next, &master->magicfree, head) {
 142                 list_del(&pt->head);
 143                 drm_ht_remove_item(&master->magiclist, &pt->hash_item);
 144                 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 145         }
 146
 147         drm_ht_remove(&master->magiclist);
 148
 149         drm_free(master, sizeof(*master), DRM_MEM_DRIVER);
 150 }
 151
 152 void drm_master_put(struct drm_master **master)
 153 {
 154         kref_put(&(*master)->refcount, drm_master_destroy);
 155         *master = NULL;
 156 }
 157
 158 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 159                         struct drm_file *file_priv)
 160 {
 161         if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
 162                 return -EINVAL;
 163
 164         if (!file_priv->master)
 165                 return -EINVAL;
 166
 167         if (!file_priv->minor->master &&
 168             file_priv->minor->master != file_priv->master) {
 169                 mutex_lock(&dev->struct_mutex);
 170                 file_priv->minor->master = drm_master_get(file_priv->master);
 171                 mutex_unlock(&dev->struct_mutex);
 172         }
 173
 174         return 0;
 175 }
 176
 177 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 178                          struct drm_file *file_priv)
 179 {
 180         if (!file_priv->master)
 181                 return -EINVAL;
 182         mutex_lock(&dev->struct_mutex);
 183         drm_master_put(&file_priv->minor->master);
 184         mutex_unlock(&dev->struct_mutex);
 185         return 0;
 186 }
 187
 188 static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
 189                            const struct pci_device_id *ent,
 190                            struct drm_driver *driver)
 191 {
 192         int retcode;
 193
 194         INIT_LIST_HEAD(&dev->filelist);
 195         INIT_LIST_HEAD(&dev->ctxlist);
 196         INIT_LIST_HEAD(&dev->vmalist);
 197         INIT_LIST_HEAD(&dev->maplist);
 198
 199         spin_lock_init(&dev->count_lock);
 200         spin_lock_init(&dev->drw_lock);
 201         init_timer(&dev->timer);
 202         mutex_init(&dev->struct_mutex);
 203         mutex_init(&dev->ctxlist_mutex);
 204
 205         idr_init(&dev->drw_idr);
 206
 207         dev->pdev = pdev;
 208         dev->pci_device = pdev->device;
 209         dev->pci_vendor = pdev->vendor;
 210
 211 #ifdef __alpha__
 212         dev->hose = pdev->sysdata;
 213 #endif
 214
 215         if (drm_ht_create(&dev->map_hash, 12)) {
 216                 return -ENOMEM;
 217         }
 218
 219         /* the DRM has 6 basic counters */
 220         dev->counters = 6;
 221         dev->types[0] = _DRM_STAT_LOCK;
 222         dev->types[1] = _DRM_STAT_OPENS;
 223         dev->types[2] = _DRM_STAT_CLOSES;
 224         dev->types[3] = _DRM_STAT_IOCTLS;
 225         dev->types[4] = _DRM_STAT_LOCKS;
 226         dev->types[5] = _DRM_STAT_UNLOCKS;
 227
 228         dev->driver = driver;
 229
 230         if (drm_core_has_AGP(dev)) {
 231                 if (drm_device_is_agp(dev))
 232                         dev->agp = drm_agp_init(dev);
 233                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 234                     && (dev->agp == NULL)) {
 235                         DRM_ERROR("Cannot initialize the agpgart module.\n");
 236                         retcode = -EINVAL;
 237                         goto error_out_unreg;
 238                 }
 239                 if (drm_core_has_MTRR(dev)) {
 240                         if (dev->agp)
 241                                 dev->agp->agp_mtrr =
 242                                     mtrr_add(dev->agp->agp_info.aper_base,
 243                                              dev->agp->agp_info.aper_size *
 244                                              1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 245                 }
 246         }
 247
 248
 249         retcode = drm_ctxbitmap_init(dev);
 250         if (retcode) {
 251                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 252                 goto error_out_unreg;
 253         }
 254
 255         if (driver->driver_features & DRIVER_GEM) {
 256                 retcode = drm_gem_init(dev);
 257                 if (retcode) {
 258                         DRM_ERROR("Cannot initialize graphics execution "
 259                                   "manager (GEM)\n");
 260                         goto error_out_unreg;
 261                 }
 262         }
 263
 264         return 0;
 265
 266       error_out_unreg:
 267         drm_lastclose(dev);
 268         return retcode;
 269 }
 270
 271
 272 /**
 273  * Get a secondary minor number.
 274  *
 275  * \param dev device data structure
 276  * \param sec-minor structure to hold the assigned minor
 277  * \return negative number on failure.
 278  *
 279  * Search an empty entry and initialize it to the given parameters, and
 280  * create the proc init entry via proc_init(). This routines assigns
 281  * minor numbers to secondary heads of multi-headed cards
 282  */
 283 static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 284 {
 285         struct drm_minor *new_minor;
 286         int ret;
 287         int minor_id;
 288
 289         DRM_DEBUG("\n");
 290
 291         minor_id = drm_minor_get_id(dev, type);
 292         if (minor_id < 0)
 293                 return minor_id;
 294
 295         new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
 296         if (!new_minor) {
 297                 ret = -ENOMEM;
 298                 goto err_idr;
 299         }
 300
 301         new_minor->type = type;
 302         new_minor->device = MKDEV(DRM_MAJOR, minor_id);
 303         new_minor->dev = dev;
 304         new_minor->index = minor_id;
 305         INIT_LIST_HEAD(&new_minor->master_list);
 306
 307         idr_replace(&drm_minors_idr, new_minor, minor_id);
 308
 309         if (type == DRM_MINOR_LEGACY) {
 310                 ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
 311                 if (ret) {
 312                         DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
 313                         goto err_mem;
 314                 }
 315         } else
 316                 new_minor->dev_root = NULL;
 317
 318         ret = drm_sysfs_device_add(new_minor);
 319         if (ret) {
 320                 printk(KERN_ERR
 321                        "DRM: Error sysfs_device_add.\n");
 322                 goto err_g2;
 323         }
 324         *minor = new_minor;
 325
 326         DRM_DEBUG("new minor assigned %d\n", minor_id);
 327         return 0;
 328
 329
 330 err_g2:
 331         if (new_minor->type == DRM_MINOR_LEGACY)
 332                 drm_proc_cleanup(new_minor, drm_proc_root);
 333 err_mem:
 334         kfree(new_minor);
 335 err_idr:
 336         idr_remove(&drm_minors_idr, minor_id);
 337         *minor = NULL;
 338         return ret;
 339 }
 340
 341 /**
 342  * Register.
 343  *
 344  * \param pdev - PCI device structure
 345  * \param ent entry from the PCI ID table with device type flags
 346  * \return zero on success or a negative number on failure.
 347  *
 348  * Attempt to gets inter module "drm" information. If we are first
 349  * then register the character device and inter module information.
 350  * Try and register, if we fail to register, backout previous work.
 351  */
 352 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 353                 struct drm_driver *driver)
 354 {
 355         struct drm_device *dev;
 356         int ret;
 357
 358         DRM_DEBUG("\n");
 359
 360         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 361         if (!dev)
 362                 return -ENOMEM;
 363
 364         ret = pci_enable_device(pdev);
 365         if (ret)
 366                 goto err_g1;
 367
 368         pci_set_master(pdev);
 369         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 370                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 371                 goto err_g2;
 372         }
 373
 374         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 375                 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 376                 if (ret)
 377                         goto err_g2;
 378         }
 379
 380         if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 381                 goto err_g3;
 382
 383         if (dev->driver->load) {
 384                 ret = dev->driver->load(dev, ent->driver_data);
 385                 if (ret)
 386                         goto err_g3;
 387         }
 388
 389         /* setup the grouping for the legacy output */
 390         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 391                 ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
 392                 if (ret)
 393                         goto err_g3;
 394         }
 395
 396         list_add_tail(&dev->driver_item, &driver->device_list);
 397
 398         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 399                  driver->name, driver->major, driver->minor, driver->patchlevel,
 400                  driver->date, dev->primary->index);
 401
 402         return 0;
 403
 404 err_g3:
 405         drm_put_minor(&dev->primary);
 406 err_g2:
 407         pci_disable_device(pdev);
 408 err_g1:
 409         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 410         return ret;
 411 }
 412
 413 /**
 414  * Put a device minor number.
 415  *
 416  * \param dev device data structure
 417  * \return always zero
 418  *
 419  * Cleans up the proc resources. If it is the last minor then release the foreign
 420  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 421  * unregisters the character device.
 422  */
 423 int drm_put_dev(struct drm_device * dev)
 424 {
 425         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 426
 427         if (dev->devname) {
 428                 drm_free(dev->devname, strlen(dev->devname) + 1,
 429                          DRM_MEM_DRIVER);
 430                 dev->devname = NULL;
 431         }
 432         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 433         return 0;
 434 }
 435
 436 /**
 437  * Put a secondary minor number.
 438  *
 439  * \param sec_minor - structure to be released
 440  * \return always zero
 441  *
 442  * Cleans up the proc resources. Not legal for this to be the
 443  * last minor released.
 444  *
 445  */
 446 int drm_put_minor(struct drm_minor **minor_p)
 447 {
 448         struct drm_minor *minor = *minor_p;
 449
 450         DRM_DEBUG("release secondary minor %d\n", minor->index);
 451
 452         if (minor->type == DRM_MINOR_LEGACY)
 453                 drm_proc_cleanup(minor, drm_proc_root);
 454         drm_sysfs_device_remove(minor);
 455
 456         idr_remove(&drm_minors_idr, minor->index);
 457
 458         kfree(minor);
 459         *minor_p = NULL;
 460         return 0;
 461 }