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 drm_sysfs_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         init_timer(&dev->timer);
  64         sema_init(&dev->struct_sem, 1);
  65         sema_init(&dev->ctxlist_sem, 1);
  66
  67         dev->pdev = pdev;
  68
  69 #ifdef __alpha__
  70         dev->hose = pdev->sysdata;
  71         dev->pci_domain = dev->hose->bus->number;
  72 #else
  73         dev->pci_domain = 0;
  74 #endif
  75         dev->pci_bus = pdev->bus->number;
  76         dev->pci_slot = PCI_SLOT(pdev->devfn);
  77         dev->pci_func = PCI_FUNC(pdev->devfn);
  78         dev->irq = pdev->irq;
  79
  80         dev->maplist = drm_calloc(1, sizeof(*dev->maplist), DRM_MEM_MAPS);
  81         if (dev->maplist == NULL)
  82                 return -ENOMEM;
  83         INIT_LIST_HEAD(&dev->maplist->head);
  84
  85         /* the DRM has 6 basic counters */
  86         dev->counters = 6;
  87         dev->types[0] = _DRM_STAT_LOCK;
  88         dev->types[1] = _DRM_STAT_OPENS;
  89         dev->types[2] = _DRM_STAT_CLOSES;
  90         dev->types[3] = _DRM_STAT_IOCTLS;
  91         dev->types[4] = _DRM_STAT_LOCKS;
  92         dev->types[5] = _DRM_STAT_UNLOCKS;
  93
  94         dev->driver = driver;
  95
  96         if (dev->driver->preinit)
  97                 if ((retcode = dev->driver->preinit(dev, ent->driver_data)))
  98                         goto error_out_unreg;
  99
 100         if (drm_core_has_AGP(dev)) {
 101                 if (drm_device_is_agp(dev))
 102                         dev->agp = drm_agp_init(dev);
 103                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 104                     && (dev->agp == NULL)) {
 105                         DRM_ERROR("Cannot initialize the agpgart module.\n");
 106                         retcode = -EINVAL;
 107                         goto error_out_unreg;
 108                 }
 109                 if (drm_core_has_MTRR(dev)) {
 110                         if (dev->agp)
 111                                 dev->agp->agp_mtrr =
 112                                     mtrr_add(dev->agp->agp_info.aper_base,
 113                                              dev->agp->agp_info.aper_size *
 114                                              1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 115                 }
 116         }
 117
 118         retcode = drm_ctxbitmap_init(dev);
 119         if (retcode) {
 120                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 121                 goto error_out_unreg;
 122         }
 123
 124         return 0;
 125
 126       error_out_unreg:
 127         drm_takedown(dev);
 128         return retcode;
 129 }
 130
 131 /**
 132  * File \c open operation.
 133  *
 134  * \param inode device inode.
 135  * \param filp file pointer.
 136  *
 137  * Puts the dev->fops corresponding to the device minor number into
 138  * \p filp, call the \c open method, and restore the file operations.
 139  */
 140 int drm_stub_open(struct inode *inode, struct file *filp)
 141 {
 142         drm_device_t *dev = NULL;
 143         int minor = iminor(inode);
 144         int err = -ENODEV;
 145         struct file_operations *old_fops;
 146
 147         DRM_DEBUG("\n");
 148
 149         if (!((minor >= 0) && (minor < drm_cards_limit)))
 150                 return -ENODEV;
 151
 152         if (!drm_heads[minor])
 153                 return -ENODEV;
 154
 155         if (!(dev = drm_heads[minor]->dev))
 156                 return -ENODEV;
 157
 158         old_fops = filp->f_op;
 159         filp->f_op = fops_get(&dev->driver->fops);
 160         if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
 161                 fops_put(filp->f_op);
 162                 filp->f_op = fops_get(old_fops);
 163         }
 164         fops_put(old_fops);
 165
 166         return err;
 167 }
 168
 169 /**
 170  * Get a secondary minor number.
 171  *
 172  * \param dev device data structure
 173  * \param sec-minor structure to hold the assigned minor
 174  * \return negative number on failure.
 175  *
 176  * Search an empty entry and initialize it to the given parameters, and
 177  * create the proc init entry via proc_init(). This routines assigns
 178  * minor numbers to secondary heads of multi-headed cards
 179  */
 180 static int drm_get_head(drm_device_t * dev, drm_head_t * head)
 181 {
 182         drm_head_t **heads = drm_heads;
 183         int ret;
 184         int minor;
 185
 186         DRM_DEBUG("\n");
 187
 188         for (minor = 0; minor < drm_cards_limit; minor++, heads++) {
 189                 if (!*heads) {
 190
 191                         *head = (drm_head_t) {
 192                         .dev = dev,.device =
 193                                     MKDEV(DRM_MAJOR, minor),.minor = minor,};
 194
 195                         if ((ret =
 196                              drm_proc_init(dev, minor, drm_proc_root,
 197                                            &head->dev_root))) {
 198                                 printk(KERN_ERR
 199                                        "DRM: Failed to initialize /proc/dri.\n");
 200                                 goto err_g1;
 201                         }
 202
 203                         head->dev_class = drm_sysfs_device_add(drm_class,
 204                                                                MKDEV(DRM_MAJOR,
 205                                                                      minor),
 206                                                                &dev->pdev->dev,
 207                                                                "card%d", minor);
 208                         if (IS_ERR(head->dev_class)) {
 209                                 printk(KERN_ERR
 210                                        "DRM: Error sysfs_device_add.\n");
 211                                 ret = PTR_ERR(head->dev_class);
 212                                 goto err_g2;
 213                         }
 214                         *heads = head;
 215
 216                         DRM_DEBUG("new minor assigned %d\n", minor);
 217                         return 0;
 218                 }
 219         }
 220         DRM_ERROR("out of minors\n");
 221         return -ENOMEM;
 222       err_g2:
 223         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 224       err_g1:
 225         *head = (drm_head_t) {
 226         .dev = NULL};
 227         return ret;
 228 }
 229
 230 /**
 231  * Register.
 232  *
 233  * \param pdev - PCI device structure
 234  * \param ent entry from the PCI ID table with device type flags
 235  * \return zero on success or a negative number on failure.
 236  *
 237  * Attempt to gets inter module "drm" information. If we are first
 238  * then register the character device and inter module information.
 239  * Try and register, if we fail to register, backout previous work.
 240  */
 241 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 242                 struct drm_driver *driver)
 243 {
 244         drm_device_t *dev;
 245         int ret;
 246
 247         DRM_DEBUG("\n");
 248
 249         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 250         if (!dev)
 251                 return -ENOMEM;
 252
 253         pci_enable_device(pdev);
 254
 255         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 256                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 257                 goto err_g1;
 258         }
 259         if ((ret = drm_get_head(dev, &dev->primary)))
 260                 goto err_g1;
 261
 262         /* postinit is a required function to display the signon banner */
 263         /* drivers add secondary heads here if needed */
 264         if ((ret = dev->driver->postinit(dev, ent->driver_data)))
 265                 goto err_g1;
 266
 267         return 0;
 268
 269       err_g1:
 270         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 271         return ret;
 272 }
 273
 274 EXPORT_SYMBOL(drm_get_dev);
 275
 276 /**
 277  * Put a device minor number.
 278  *
 279  * \param dev device data structure
 280  * \return always zero
 281  *
 282  * Cleans up the proc resources. If it is the last minor then release the foreign
 283  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 284  * unregisters the character device.
 285  */
 286 int drm_put_dev(drm_device_t * dev)
 287 {
 288         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 289
 290         if (dev->unique) {
 291                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 292                 dev->unique = NULL;
 293                 dev->unique_len = 0;
 294         }
 295         if (dev->devname) {
 296                 drm_free(dev->devname, strlen(dev->devname) + 1,
 297                          DRM_MEM_DRIVER);
 298                 dev->devname = NULL;
 299         }
 300         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 301         return 0;
 302 }
 303
 304 /**
 305  * Put a secondary minor number.
 306  *
 307  * \param sec_minor - structure to be released
 308  * \return always zero
 309  *
 310  * Cleans up the proc resources. Not legal for this to be the
 311  * last minor released.
 312  *
 313  */
 314 int drm_put_head(drm_head_t * head)
 315 {
 316         int minor = head->minor;
 317
 318         DRM_DEBUG("release secondary minor %d\n", minor);
 319
 320         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 321         drm_sysfs_device_remove(MKDEV(DRM_MAJOR, head->minor));
 322
 323         *head = (drm_head_t) {
 324         .dev = NULL};
 325
 326         drm_heads[minor] = NULL;
 327
 328         return 0;
 329 }