release/src-rt-6.x/linux/linux-2.6/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 drm_head_t **drm_heads;
  53 struct class *drm_class;
  54 struct proc_dir_entry *drm_proc_root;
  55
  56 static int drm_fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
  57                            const struct pci_device_id *ent,
  58                            struct drm_driver *driver)
  59 {
  60         int retcode;
  61
  62         spin_lock_init(&dev->count_lock);
  63         spin_lock_init(&dev->drw_lock);
  64         spin_lock_init(&dev->tasklet_lock);
  65         spin_lock_init(&dev->lock.spinlock);
  66         init_timer(&dev->timer);
  67         mutex_init(&dev->struct_mutex);
  68         mutex_init(&dev->ctxlist_mutex);
  69
  70         dev->pdev = pdev;
  71         dev->pci_device = pdev->device;
  72         dev->pci_vendor = pdev->vendor;
  73
  74 #ifdef __alpha__
  75         dev->hose = pdev->sysdata;
  76 #endif
  77         dev->irq = pdev->irq;
  78
  79         dev->maplist = drm_calloc(1, sizeof(*dev->maplist), DRM_MEM_MAPS);
  80         if (dev->maplist == NULL)
  81                 return -ENOMEM;
  82         INIT_LIST_HEAD(&dev->maplist->head);
  83         if (drm_ht_create(&dev->map_hash, 12)) {
  84                 drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
  85                 return -ENOMEM;
  86         }
  87
  88         /* the DRM has 6 basic counters */
  89         dev->counters = 6;
  90         dev->types[0] = _DRM_STAT_LOCK;
  91         dev->types[1] = _DRM_STAT_OPENS;
  92         dev->types[2] = _DRM_STAT_CLOSES;
  93         dev->types[3] = _DRM_STAT_IOCTLS;
  94         dev->types[4] = _DRM_STAT_LOCKS;
  95         dev->types[5] = _DRM_STAT_UNLOCKS;
  96
  97         dev->driver = driver;
  98
  99         if (dev->driver->load)
 100                 if ((retcode = dev->driver->load(dev, ent->driver_data)))
 101                         goto error_out_unreg;
 102
 103         if (drm_core_has_AGP(dev)) {
 104                 if (drm_device_is_agp(dev))
 105                         dev->agp = drm_agp_init(dev);
 106                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 107                     && (dev->agp == NULL)) {
 108                         DRM_ERROR("Cannot initialize the agpgart module.\n");
 109                         retcode = -EINVAL;
 110                         goto error_out_unreg;
 111                 }
 112                 if (drm_core_has_MTRR(dev)) {
 113                         if (dev->agp)
 114                                 dev->agp->agp_mtrr =
 115                                     mtrr_add(dev->agp->agp_info.aper_base,
 116                                              dev->agp->agp_info.aper_size *
 117                                              1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 118                 }
 119         }
 120
 121         retcode = drm_ctxbitmap_init(dev);
 122         if (retcode) {
 123                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 124                 goto error_out_unreg;
 125         }
 126
 127         return 0;
 128
 129       error_out_unreg:
 130         drm_lastclose(dev);
 131         return retcode;
 132 }
 133
 134
 135 /**
 136  * Get a secondary minor number.
 137  *
 138  * \param dev device data structure
 139  * \param sec-minor structure to hold the assigned minor
 140  * \return negative number on failure.
 141  *
 142  * Search an empty entry and initialize it to the given parameters, and
 143  * create the proc init entry via proc_init(). This routines assigns
 144  * minor numbers to secondary heads of multi-headed cards
 145  */
 146 static int drm_get_head(drm_device_t * dev, drm_head_t * head)
 147 {
 148         drm_head_t **heads = drm_heads;
 149         int ret;
 150         int minor;
 151
 152         DRM_DEBUG("\n");
 153
 154         for (minor = 0; minor < drm_cards_limit; minor++, heads++) {
 155                 if (!*heads) {
 156
 157                         *head = (drm_head_t) {
 158                         .dev = dev,.device =
 159                                     MKDEV(DRM_MAJOR, minor),.minor = minor,};
 160
 161                         if ((ret =
 162                              drm_proc_init(dev, minor, drm_proc_root,
 163                                            &head->dev_root))) {
 164                                 printk(KERN_ERR
 165                                        "DRM: Failed to initialize /proc/dri.\n");
 166                                 goto err_g1;
 167                         }
 168
 169                         head->dev_class = drm_sysfs_device_add(drm_class, head);
 170                         if (IS_ERR(head->dev_class)) {
 171                                 printk(KERN_ERR
 172                                        "DRM: Error sysfs_device_add.\n");
 173                                 ret = PTR_ERR(head->dev_class);
 174                                 goto err_g2;
 175                         }
 176                         *heads = head;
 177
 178                         DRM_DEBUG("new minor assigned %d\n", minor);
 179                         return 0;
 180                 }
 181         }
 182         DRM_ERROR("out of minors\n");
 183         return -ENOMEM;
 184       err_g2:
 185         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 186       err_g1:
 187         *head = (drm_head_t) {
 188         .dev = NULL};
 189         return ret;
 190 }
 191
 192 /**
 193  * Register.
 194  *
 195  * \param pdev - PCI device structure
 196  * \param ent entry from the PCI ID table with device type flags
 197  * \return zero on success or a negative number on failure.
 198  *
 199  * Attempt to gets inter module "drm" information. If we are first
 200  * then register the character device and inter module information.
 201  * Try and register, if we fail to register, backout previous work.
 202  */
 203 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 204                 struct drm_driver *driver)
 205 {
 206         drm_device_t *dev;
 207         int ret;
 208
 209         DRM_DEBUG("\n");
 210
 211         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 212         if (!dev)
 213                 return -ENOMEM;
 214
 215         ret = pci_enable_device(pdev);
 216         if (ret)
 217                 goto err_g1;
 218
 219         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 220                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 221                 goto err_g2;
 222         }
 223         if ((ret = drm_get_head(dev, &dev->primary)))
 224                 goto err_g2;
 225
 226         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 227                  driver->name, driver->major, driver->minor, driver->patchlevel,
 228                  driver->date, dev->primary.minor);
 229
 230         return 0;
 231
 232 err_g2:
 233         pci_disable_device(pdev);
 234 err_g1:
 235         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 236         return ret;
 237 }
 238
 239 /**
 240  * Put a device minor number.
 241  *
 242  * \param dev device data structure
 243  * \return always zero
 244  *
 245  * Cleans up the proc resources. If it is the last minor then release the foreign
 246  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 247  * unregisters the character device.
 248  */
 249 int drm_put_dev(drm_device_t * dev)
 250 {
 251         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 252
 253         if (dev->unique) {
 254                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 255                 dev->unique = NULL;
 256                 dev->unique_len = 0;
 257         }
 258         if (dev->devname) {
 259                 drm_free(dev->devname, strlen(dev->devname) + 1,
 260                          DRM_MEM_DRIVER);
 261                 dev->devname = NULL;
 262         }
 263         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 264         return 0;
 265 }
 266
 267 /**
 268  * Put a secondary minor number.
 269  *
 270  * \param sec_minor - structure to be released
 271  * \return always zero
 272  *
 273  * Cleans up the proc resources. Not legal for this to be the
 274  * last minor released.
 275  *
 276  */
 277 int drm_put_head(drm_head_t * head)
 278 {
 279         int minor = head->minor;
 280
 281         DRM_DEBUG("release secondary minor %d\n", minor);
 282
 283         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 284         drm_sysfs_device_remove(head->dev_class);
 285
 286         *head = (drm_head_t) {.dev = NULL};
 287
 288         drm_heads[minor] = NULL;
 289
 290         return 0;
 291 }