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