drivers/char/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_cards_limit = 16;      /* Enough for one machine */
  40 unsigned int drm_debug = 0;     /* 1 to enable debug output */
  41 EXPORT_SYMBOL(drm_debug);
  42
  43 MODULE_AUTHOR(CORE_AUTHOR);
  44 MODULE_DESCRIPTION(CORE_DESC);
  45 MODULE_LICENSE("GPL and additional rights");
  46 MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
  47 MODULE_PARM_DESC(debug, "Enable debug output");
  48
  49 module_param_named(cards_limit, drm_cards_limit, int, 0444);
  50 module_param_named(debug, drm_debug, int, 0600);
  51
  52 struct drm_head **drm_heads;
  53 struct class *drm_class;
  54 struct proc_dir_entry *drm_proc_root;
  55
  56 static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
  57                            const struct pci_device_id *ent,
  58                            struct drm_driver *driver)
  59 {
  60         int retcode;
  61
  62         INIT_LIST_HEAD(&dev->filelist);
  63         INIT_LIST_HEAD(&dev->ctxlist);
  64         INIT_LIST_HEAD(&dev->vmalist);
  65         INIT_LIST_HEAD(&dev->maplist);
  66
  67         spin_lock_init(&dev->count_lock);
  68         spin_lock_init(&dev->drw_lock);
  69         spin_lock_init(&dev->tasklet_lock);
  70         spin_lock_init(&dev->lock.spinlock);
  71         init_timer(&dev->timer);
  72         mutex_init(&dev->struct_mutex);
  73         mutex_init(&dev->ctxlist_mutex);
  74
  75         idr_init(&dev->drw_idr);
  76
  77         dev->pdev = pdev;
  78         dev->pci_device = pdev->device;
  79         dev->pci_vendor = pdev->vendor;
  80
  81 #ifdef __alpha__
  82         dev->hose = pdev->sysdata;
  83 #endif
  84         dev->irq = pdev->irq;
  85
  86         if (drm_ht_create(&dev->map_hash, 12)) {
  87                 return -ENOMEM;
  88         }
  89
  90         /* the DRM has 6 basic counters */
  91         dev->counters = 6;
  92         dev->types[0] = _DRM_STAT_LOCK;
  93         dev->types[1] = _DRM_STAT_OPENS;
  94         dev->types[2] = _DRM_STAT_CLOSES;
  95         dev->types[3] = _DRM_STAT_IOCTLS;
  96         dev->types[4] = _DRM_STAT_LOCKS;
  97         dev->types[5] = _DRM_STAT_UNLOCKS;
  98
  99         dev->driver = driver;
 100
 101         if (dev->driver->load)
 102                 if ((retcode = dev->driver->load(dev, ent->driver_data)))
 103                         goto error_out_unreg;
 104
 105         if (drm_core_has_AGP(dev)) {
 106                 if (drm_device_is_agp(dev))
 107                         dev->agp = drm_agp_init(dev);
 108                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 109                     && (dev->agp == NULL)) {
 110                         DRM_ERROR("Cannot initialize the agpgart module.\n");
 111                         retcode = -EINVAL;
 112                         goto error_out_unreg;
 113                 }
 114                 if (drm_core_has_MTRR(dev)) {
 115                         if (dev->agp)
 116                                 dev->agp->agp_mtrr =
 117                                     mtrr_add(dev->agp->agp_info.aper_base,
 118                                              dev->agp->agp_info.aper_size *
 119                                              1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 120                 }
 121         }
 122
 123         retcode = drm_ctxbitmap_init(dev);
 124         if (retcode) {
 125                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 126                 goto error_out_unreg;
 127         }
 128
 129         return 0;
 130
 131       error_out_unreg:
 132         drm_lastclose(dev);
 133         return retcode;
 134 }
 135
 136
 137 /**
 138  * Get a secondary minor number.
 139  *
 140  * \param dev device data structure
 141  * \param sec-minor structure to hold the assigned minor
 142  * \return negative number on failure.
 143  *
 144  * Search an empty entry and initialize it to the given parameters, and
 145  * create the proc init entry via proc_init(). This routines assigns
 146  * minor numbers to secondary heads of multi-headed cards
 147  */
 148 static int drm_get_head(struct drm_device * dev, struct drm_head * head)
 149 {
 150         struct drm_head **heads = drm_heads;
 151         int ret;
 152         int minor;
 153
 154         DRM_DEBUG("\n");
 155
 156         for (minor = 0; minor < drm_cards_limit; minor++, heads++) {
 157                 if (!*heads) {
 158
 159                         *head = (struct drm_head) {
 160                         .dev = dev,.device =
 161                                     MKDEV(DRM_MAJOR, minor),.minor = minor,};
 162
 163                         if ((ret =
 164                              drm_proc_init(dev, minor, drm_proc_root,
 165                                            &head->dev_root))) {
 166                                 printk(KERN_ERR
 167                                        "DRM: Failed to initialize /proc/dri.\n");
 168                                 goto err_g1;
 169                         }
 170
 171                         head->dev_class = drm_sysfs_device_add(drm_class, head);
 172                         if (IS_ERR(head->dev_class)) {
 173                                 printk(KERN_ERR
 174                                        "DRM: Error sysfs_device_add.\n");
 175                                 ret = PTR_ERR(head->dev_class);
 176                                 goto err_g2;
 177                         }
 178                         *heads = head;
 179
 180                         DRM_DEBUG("new minor assigned %d\n", minor);
 181                         return 0;
 182                 }
 183         }
 184         DRM_ERROR("out of minors\n");
 185         return -ENOMEM;
 186       err_g2:
 187         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 188       err_g1:
 189         *head = (struct drm_head) {
 190         .dev = NULL};
 191         return ret;
 192 }
 193
 194 /**
 195  * Register.
 196  *
 197  * \param pdev - PCI device structure
 198  * \param ent entry from the PCI ID table with device type flags
 199  * \return zero on success or a negative number on failure.
 200  *
 201  * Attempt to gets inter module "drm" information. If we are first
 202  * then register the character device and inter module information.
 203  * Try and register, if we fail to register, backout previous work.
 204  */
 205 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 206                 struct drm_driver *driver)
 207 {
 208         struct drm_device *dev;
 209         int ret;
 210
 211         DRM_DEBUG("\n");
 212
 213         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 214         if (!dev)
 215                 return -ENOMEM;
 216
 217         ret = pci_enable_device(pdev);
 218         if (ret)
 219                 goto err_g1;
 220
 221         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 222                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 223                 goto err_g2;
 224         }
 225         if ((ret = drm_get_head(dev, &dev->primary)))
 226                 goto err_g2;
 227
 228         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 229                  driver->name, driver->major, driver->minor, driver->patchlevel,
 230                  driver->date, dev->primary.minor);
 231
 232         return 0;
 233
 234 err_g2:
 235         pci_disable_device(pdev);
 236 err_g1:
 237         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 238         return ret;
 239 }
 240
 241 /**
 242  * Put a device minor number.
 243  *
 244  * \param dev device data structure
 245  * \return always zero
 246  *
 247  * Cleans up the proc resources. If it is the last minor then release the foreign
 248  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 249  * unregisters the character device.
 250  */
 251 int drm_put_dev(struct drm_device * dev)
 252 {
 253         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 254
 255         if (dev->unique) {
 256                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 257                 dev->unique = NULL;
 258                 dev->unique_len = 0;
 259         }
 260         if (dev->devname) {
 261                 drm_free(dev->devname, strlen(dev->devname) + 1,
 262                          DRM_MEM_DRIVER);
 263                 dev->devname = NULL;
 264         }
 265         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 266         return 0;
 267 }
 268
 269 /**
 270  * Put a secondary minor number.
 271  *
 272  * \param sec_minor - structure to be released
 273  * \return always zero
 274  *
 275  * Cleans up the proc resources. Not legal for this to be the
 276  * last minor released.
 277  *
 278  */
 279 int drm_put_head(struct drm_head * head)
 280 {
 281         int minor = head->minor;
 282
 283         DRM_DEBUG("release secondary minor %d\n", minor);
 284
 285         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 286         drm_sysfs_device_remove(head->dev_class);
 287
 288         *head = (struct drm_head) {.dev = NULL};
 289
 290         drm_heads[minor] = NULL;
 291
 292         return 0;
 293 }