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 static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
  83                            const struct pci_device_id *ent,
  84                            struct drm_driver *driver)
  85 {
  86         int retcode;
  87
  88         INIT_LIST_HEAD(&dev->filelist);
  89         INIT_LIST_HEAD(&dev->ctxlist);
  90         INIT_LIST_HEAD(&dev->vmalist);
  91         INIT_LIST_HEAD(&dev->maplist);
  92
  93         spin_lock_init(&dev->count_lock);
  94         spin_lock_init(&dev->drw_lock);
  95         spin_lock_init(&dev->lock.spinlock);
  96         init_timer(&dev->timer);
  97         mutex_init(&dev->struct_mutex);
  98         mutex_init(&dev->ctxlist_mutex);
  99
 100         idr_init(&dev->drw_idr);
 101
 102         dev->pdev = pdev;
 103         dev->pci_device = pdev->device;
 104         dev->pci_vendor = pdev->vendor;
 105
 106 #ifdef __alpha__
 107         dev->hose = pdev->sysdata;
 108 #endif
 109
 110         if (drm_ht_create(&dev->map_hash, 12)) {
 111                 return -ENOMEM;
 112         }
 113
 114         /* the DRM has 6 basic counters */
 115         dev->counters = 6;
 116         dev->types[0] = _DRM_STAT_LOCK;
 117         dev->types[1] = _DRM_STAT_OPENS;
 118         dev->types[2] = _DRM_STAT_CLOSES;
 119         dev->types[3] = _DRM_STAT_IOCTLS;
 120         dev->types[4] = _DRM_STAT_LOCKS;
 121         dev->types[5] = _DRM_STAT_UNLOCKS;
 122
 123         dev->driver = driver;
 124
 125         if (drm_core_has_AGP(dev)) {
 126                 if (drm_device_is_agp(dev))
 127                         dev->agp = drm_agp_init(dev);
 128                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 129                     && (dev->agp == NULL)) {
 130                         DRM_ERROR("Cannot initialize the agpgart module.\n");
 131                         retcode = -EINVAL;
 132                         goto error_out_unreg;
 133                 }
 134                 if (drm_core_has_MTRR(dev)) {
 135                         if (dev->agp)
 136                                 dev->agp->agp_mtrr =
 137                                     mtrr_add(dev->agp->agp_info.aper_base,
 138                                              dev->agp->agp_info.aper_size *
 139                                              1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 140                 }
 141         }
 142
 143         if (dev->driver->load)
 144                 if ((retcode = dev->driver->load(dev, ent->driver_data)))
 145                         goto error_out_unreg;
 146
 147         retcode = drm_ctxbitmap_init(dev);
 148         if (retcode) {
 149                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 150                 goto error_out_unreg;
 151         }
 152
 153         if (driver->driver_features & DRIVER_GEM) {
 154                 retcode = drm_gem_init(dev);
 155                 if (retcode) {
 156                         DRM_ERROR("Cannot initialize graphics execution "
 157                                   "manager (GEM)\n");
 158                         goto error_out_unreg;
 159                 }
 160         }
 161
 162         return 0;
 163
 164       error_out_unreg:
 165         drm_lastclose(dev);
 166         return retcode;
 167 }
 168
 169
 170 /**
 171  * Get a secondary minor number.
 172  *
 173  * \param dev device data structure
 174  * \param sec-minor structure to hold the assigned minor
 175  * \return negative number on failure.
 176  *
 177  * Search an empty entry and initialize it to the given parameters, and
 178  * create the proc init entry via proc_init(). This routines assigns
 179  * minor numbers to secondary heads of multi-headed cards
 180  */
 181 static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 182 {
 183         struct drm_minor *new_minor;
 184         int ret;
 185         int minor_id;
 186
 187         DRM_DEBUG("\n");
 188
 189         minor_id = drm_minor_get_id(dev, type);
 190         if (minor_id < 0)
 191                 return minor_id;
 192
 193         new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
 194         if (!new_minor) {
 195                 ret = -ENOMEM;
 196                 goto err_idr;
 197         }
 198
 199         new_minor->type = type;
 200         new_minor->device = MKDEV(DRM_MAJOR, minor_id);
 201         new_minor->dev = dev;
 202         new_minor->index = minor_id;
 203
 204         idr_replace(&drm_minors_idr, new_minor, minor_id);
 205
 206         if (type == DRM_MINOR_LEGACY) {
 207                 ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
 208                 if (ret) {
 209                         DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
 210                         goto err_mem;
 211                 }
 212         } else
 213                 new_minor->dev_root = NULL;
 214
 215         ret = drm_sysfs_device_add(new_minor);
 216         if (ret) {
 217                 printk(KERN_ERR
 218                        "DRM: Error sysfs_device_add.\n");
 219                 goto err_g2;
 220         }
 221         *minor = new_minor;
 222
 223         DRM_DEBUG("new minor assigned %d\n", minor_id);
 224         return 0;
 225
 226
 227 err_g2:
 228         if (new_minor->type == DRM_MINOR_LEGACY)
 229                 drm_proc_cleanup(new_minor, drm_proc_root);
 230 err_mem:
 231         kfree(new_minor);
 232 err_idr:
 233         idr_remove(&drm_minors_idr, minor_id);
 234         *minor = NULL;
 235         return ret;
 236 }
 237
 238 /**
 239  * Register.
 240  *
 241  * \param pdev - PCI device structure
 242  * \param ent entry from the PCI ID table with device type flags
 243  * \return zero on success or a negative number on failure.
 244  *
 245  * Attempt to gets inter module "drm" information. If we are first
 246  * then register the character device and inter module information.
 247  * Try and register, if we fail to register, backout previous work.
 248  */
 249 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 250                 struct drm_driver *driver)
 251 {
 252         struct drm_device *dev;
 253         int ret;
 254
 255         DRM_DEBUG("\n");
 256
 257         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 258         if (!dev)
 259                 return -ENOMEM;
 260
 261         ret = pci_enable_device(pdev);
 262         if (ret)
 263                 goto err_g1;
 264
 265         pci_set_master(pdev);
 266         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 267                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 268                 goto err_g2;
 269         }
 270         if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 271                 goto err_g2;
 272
 273         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 274                  driver->name, driver->major, driver->minor, driver->patchlevel,
 275                  driver->date, dev->primary->index);
 276
 277         return 0;
 278
 279 err_g2:
 280         pci_disable_device(pdev);
 281 err_g1:
 282         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 283         return ret;
 284 }
 285
 286 /**
 287  * Put a device minor number.
 288  *
 289  * \param dev device data structure
 290  * \return always zero
 291  *
 292  * Cleans up the proc resources. If it is the last minor then release the foreign
 293  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 294  * unregisters the character device.
 295  */
 296 int drm_put_dev(struct drm_device * dev)
 297 {
 298         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 299
 300         if (dev->unique) {
 301                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 302                 dev->unique = NULL;
 303                 dev->unique_len = 0;
 304         }
 305         if (dev->devname) {
 306                 drm_free(dev->devname, strlen(dev->devname) + 1,
 307                          DRM_MEM_DRIVER);
 308                 dev->devname = NULL;
 309         }
 310         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 311         return 0;
 312 }
 313
 314 /**
 315  * Put a secondary minor number.
 316  *
 317  * \param sec_minor - structure to be released
 318  * \return always zero
 319  *
 320  * Cleans up the proc resources. Not legal for this to be the
 321  * last minor released.
 322  *
 323  */
 324 int drm_put_minor(struct drm_minor **minor_p)
 325 {
 326         struct drm_minor *minor = *minor_p;
 327
 328         DRM_DEBUG("release secondary minor %d\n", minor->index);
 329
 330         if (minor->type == DRM_MINOR_LEGACY)
 331                 drm_proc_cleanup(minor, drm_proc_root);
 332         drm_sysfs_device_remove(minor);
 333
 334         idr_remove(&drm_minors_idr, minor->index);
 335
 336         kfree(minor);
 337         *minor_p = NULL;
 338         return 0;
 339 }