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