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 again:
  61         if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
  62                 DRM_ERROR("Out of memory expanding drawable idr\n");
  63                 return -ENOMEM;
  64         }
  65         mutex_lock(&dev->struct_mutex);
  66         ret = idr_get_new_above(&drm_minors_idr, NULL,
  67                                 base, &new_id);
  68         mutex_unlock(&dev->struct_mutex);
  69         if (ret == -EAGAIN) {
  70                 goto again;
  71         } else if (ret) {
  72                 return ret;
  73         }
  74
  75         if (new_id >= limit) {
  76                 idr_remove(&drm_minors_idr, new_id);
  77                 return -EINVAL;
  78         }
  79         return new_id;
  80 }
  81
  82 struct drm_master *drm_master_create(struct drm_minor *minor)
  83 {
  84         struct drm_master *master;
  85
  86         master = drm_calloc(1, sizeof(*master), DRM_MEM_DRIVER);
  87         if (!master)
  88                 return NULL;
  89
  90         kref_init(&master->refcount);
  91         spin_lock_init(&master->lock.spinlock);
  92         init_waitqueue_head(&master->lock.lock_queue);
  93         drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
  94         INIT_LIST_HEAD(&master->magicfree);
  95         master->minor = minor;
  96
  97         list_add_tail(&master->head, &minor->master_list);
  98
  99         return master;
 100 }
 101
 102 struct drm_master *drm_master_get(struct drm_master *master)
 103 {
 104         kref_get(&master->refcount);
 105         return master;
 106 }
 107
 108 static void drm_master_destroy(struct kref *kref)
 109 {
 110         struct drm_master *master = container_of(kref, struct drm_master, refcount);
 111         struct drm_magic_entry *pt, *next;
 112         struct drm_device *dev = master->minor->dev;
 113
 114         list_del(&master->head);
 115
 116         if (dev->driver->master_destroy)
 117                 dev->driver->master_destroy(dev, master);
 118
 119         if (master->unique) {
 120                 drm_free(master->unique, master->unique_size, DRM_MEM_DRIVER);
 121                 master->unique = NULL;
 122                 master->unique_len = 0;
 123         }
 124
 125         list_for_each_entry_safe(pt, next, &master->magicfree, head) {
 126                 list_del(&pt->head);
 127                 drm_ht_remove_item(&master->magiclist, &pt->hash_item);
 128                 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 129         }
 130
 131         drm_ht_remove(&master->magiclist);
 132
 133         if (master->lock.hw_lock) {
 134                 if (dev->sigdata.lock == master->lock.hw_lock)
 135                         dev->sigdata.lock = NULL;
 136                 master->lock.hw_lock = NULL;
 137                 master->lock.file_priv = NULL;
 138                 wake_up_interruptible(&master->lock.lock_queue);
 139         }
 140
 141         drm_free(master, sizeof(*master), DRM_MEM_DRIVER);
 142 }
 143
 144 void drm_master_put(struct drm_master **master)
 145 {
 146         kref_put(&(*master)->refcount, drm_master_destroy);
 147         *master = NULL;
 148 }
 149
 150 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 151                         struct drm_file *file_priv)
 152 {
 153         if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
 154                 return -EINVAL;
 155
 156         if (!file_priv->master)
 157                 return -EINVAL;
 158
 159         if (!file_priv->minor->master &&
 160             file_priv->minor->master != file_priv->master) {
 161                 mutex_lock(&dev->struct_mutex);
 162                 file_priv->minor->master = drm_master_get(file_priv->master);
 163                 mutex_lock(&dev->struct_mutex);
 164         }
 165
 166         return 0;
 167 }
 168
 169 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 170                          struct drm_file *file_priv)
 171 {
 172         if (!file_priv->master)
 173                 return -EINVAL;
 174         mutex_lock(&dev->struct_mutex);
 175         drm_master_put(&file_priv->minor->master);
 176         mutex_unlock(&dev->struct_mutex);
 177         return 0;
 178 }
 179
 180 static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
 181                            const struct pci_device_id *ent,
 182                            struct drm_driver *driver)
 183 {
 184         int retcode;
 185
 186         INIT_LIST_HEAD(&dev->filelist);
 187         INIT_LIST_HEAD(&dev->ctxlist);
 188         INIT_LIST_HEAD(&dev->vmalist);
 189         INIT_LIST_HEAD(&dev->maplist);
 190
 191         spin_lock_init(&dev->count_lock);
 192         spin_lock_init(&dev->drw_lock);
 193         init_timer(&dev->timer);
 194         mutex_init(&dev->struct_mutex);
 195         mutex_init(&dev->ctxlist_mutex);
 196
 197         idr_init(&dev->drw_idr);
 198
 199         dev->pdev = pdev;
 200         dev->pci_device = pdev->device;
 201         dev->pci_vendor = pdev->vendor;
 202
 203 #ifdef __alpha__
 204         dev->hose = pdev->sysdata;
 205 #endif
 206
 207         if (drm_ht_create(&dev->map_hash, 12)) {
 208                 return -ENOMEM;
 209         }
 210
 211         /* the DRM has 6 basic counters */
 212         dev->counters = 6;
 213         dev->types[0] = _DRM_STAT_LOCK;
 214         dev->types[1] = _DRM_STAT_OPENS;
 215         dev->types[2] = _DRM_STAT_CLOSES;
 216         dev->types[3] = _DRM_STAT_IOCTLS;
 217         dev->types[4] = _DRM_STAT_LOCKS;
 218         dev->types[5] = _DRM_STAT_UNLOCKS;
 219
 220         dev->driver = driver;
 221
 222         if (drm_core_has_AGP(dev)) {
 223                 if (drm_device_is_agp(dev))
 224                         dev->agp = drm_agp_init(dev);
 225                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 226                     && (dev->agp == NULL)) {
 227                         DRM_ERROR("Cannot initialize the agpgart module.\n");
 228                         retcode = -EINVAL;
 229                         goto error_out_unreg;
 230                 }
 231                 if (drm_core_has_MTRR(dev)) {
 232                         if (dev->agp)
 233                                 dev->agp->agp_mtrr =
 234                                     mtrr_add(dev->agp->agp_info.aper_base,
 235                                              dev->agp->agp_info.aper_size *
 236                                              1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 237                 }
 238         }
 239
 240
 241         retcode = drm_ctxbitmap_init(dev);
 242         if (retcode) {
 243                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 244                 goto error_out_unreg;
 245         }
 246
 247         if (driver->driver_features & DRIVER_GEM) {
 248                 retcode = drm_gem_init(dev);
 249                 if (retcode) {
 250                         DRM_ERROR("Cannot initialize graphics execution "
 251                                   "manager (GEM)\n");
 252                         goto error_out_unreg;
 253                 }
 254         }
 255
 256         return 0;
 257
 258       error_out_unreg:
 259         drm_lastclose(dev);
 260         return retcode;
 261 }
 262
 263
 264 /**
 265  * Get a secondary minor number.
 266  *
 267  * \param dev device data structure
 268  * \param sec-minor structure to hold the assigned minor
 269  * \return negative number on failure.
 270  *
 271  * Search an empty entry and initialize it to the given parameters, and
 272  * create the proc init entry via proc_init(). This routines assigns
 273  * minor numbers to secondary heads of multi-headed cards
 274  */
 275 static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 276 {
 277         struct drm_minor *new_minor;
 278         int ret;
 279         int minor_id;
 280
 281         DRM_DEBUG("\n");
 282
 283         minor_id = drm_minor_get_id(dev, type);
 284         if (minor_id < 0)
 285                 return minor_id;
 286
 287         new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
 288         if (!new_minor) {
 289                 ret = -ENOMEM;
 290                 goto err_idr;
 291         }
 292
 293         new_minor->type = type;
 294         new_minor->device = MKDEV(DRM_MAJOR, minor_id);
 295         new_minor->dev = dev;
 296         new_minor->index = minor_id;
 297         INIT_LIST_HEAD(&new_minor->master_list);
 298
 299         idr_replace(&drm_minors_idr, new_minor, minor_id);
 300
 301         if (type == DRM_MINOR_LEGACY) {
 302                 ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
 303                 if (ret) {
 304                         DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
 305                         goto err_mem;
 306                 }
 307         } else
 308                 new_minor->dev_root = NULL;
 309
 310         ret = drm_sysfs_device_add(new_minor);
 311         if (ret) {
 312                 printk(KERN_ERR
 313                        "DRM: Error sysfs_device_add.\n");
 314                 goto err_g2;
 315         }
 316         *minor = new_minor;
 317
 318         DRM_DEBUG("new minor assigned %d\n", minor_id);
 319         return 0;
 320
 321
 322 err_g2:
 323         if (new_minor->type == DRM_MINOR_LEGACY)
 324                 drm_proc_cleanup(new_minor, drm_proc_root);
 325 err_mem:
 326         kfree(new_minor);
 327 err_idr:
 328         idr_remove(&drm_minors_idr, minor_id);
 329         *minor = NULL;
 330         return ret;
 331 }
 332
 333 /**
 334  * Register.
 335  *
 336  * \param pdev - PCI device structure
 337  * \param ent entry from the PCI ID table with device type flags
 338  * \return zero on success or a negative number on failure.
 339  *
 340  * Attempt to gets inter module "drm" information. If we are first
 341  * then register the character device and inter module information.
 342  * Try and register, if we fail to register, backout previous work.
 343  */
 344 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 345                 struct drm_driver *driver)
 346 {
 347         struct drm_device *dev;
 348         int ret;
 349
 350         DRM_DEBUG("\n");
 351
 352         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 353         if (!dev)
 354                 return -ENOMEM;
 355
 356         ret = pci_enable_device(pdev);
 357         if (ret)
 358                 goto err_g1;
 359
 360         pci_set_master(pdev);
 361         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 362                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 363                 goto err_g2;
 364         }
 365         if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 366                 goto err_g2;
 367
 368         if (dev->driver->load)
 369                 if ((ret = dev->driver->load(dev, ent->driver_data)))
 370                         goto err_g3;
 371
 372         list_add_tail(&dev->driver_item, &driver->device_list);
 373
 374         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 375                  driver->name, driver->major, driver->minor, driver->patchlevel,
 376                  driver->date, dev->primary->index);
 377
 378         return 0;
 379
 380 err_g3:
 381         drm_put_minor(&dev->primary);
 382 err_g2:
 383         pci_disable_device(pdev);
 384 err_g1:
 385         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 386         return ret;
 387 }
 388
 389 /**
 390  * Put a device minor number.
 391  *
 392  * \param dev device data structure
 393  * \return always zero
 394  *
 395  * Cleans up the proc resources. If it is the last minor then release the foreign
 396  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 397  * unregisters the character device.
 398  */
 399 int drm_put_dev(struct drm_device * dev)
 400 {
 401         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 402
 403         if (dev->devname) {
 404                 drm_free(dev->devname, strlen(dev->devname) + 1,
 405                          DRM_MEM_DRIVER);
 406                 dev->devname = NULL;
 407         }
 408         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 409         return 0;
 410 }
 411
 412 /**
 413  * Put a secondary minor number.
 414  *
 415  * \param sec_minor - structure to be released
 416  * \return always zero
 417  *
 418  * Cleans up the proc resources. Not legal for this to be the
 419  * last minor released.
 420  *
 421  */
 422 int drm_put_minor(struct drm_minor **minor_p)
 423 {
 424         struct drm_minor *minor = *minor_p;
 425
 426         DRM_DEBUG("release secondary minor %d\n", minor->index);
 427
 428         if (minor->type == DRM_MINOR_LEGACY)
 429                 drm_proc_cleanup(minor, drm_proc_root);
 430         drm_sysfs_device_remove(minor);
 431
 432         idr_remove(&drm_minors_idr, minor->index);
 433
 434         kfree(minor);
 435         *minor_p = NULL;
 436         return 0;
 437 }