drivers/char/drm/drm_agpsupport.c

   1 /**
   2  * \file drm_agpsupport.h
   3  * DRM support for AGP/GART backend
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  11  * Copyright 2000 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  * VA LINUX SYSTEMS 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
  31  * OTHER DEALINGS IN THE SOFTWARE.
  32  */
  33
  34 #include "drmP.h"
  35 #include <linux/module.h>
  36
  37 #if __OS_HAS_AGP
  38
  39 /**
  40  * Get AGP information.
  41  *
  42  * \param inode device inode.
  43  * \param filp file pointer.
  44  * \param cmd command.
  45  * \param arg pointer to a (output) drm_agp_info structure.
  46  * \return zero on success or a negative number on failure.
  47  *
  48  * Verifies the AGP device has been initialized and acquired and fills in the
  49  * drm_agp_info structure with the information in drm_agp_head::agp_info.
  50  */
  51 int drm_agp_info(drm_device_t * dev, drm_agp_info_t * info)
  52 {
  53         DRM_AGP_KERN *kern;
  54
  55         if (!dev->agp || !dev->agp->acquired)
  56                 return -EINVAL;
  57
  58         kern = &dev->agp->agp_info;
  59         info->agp_version_major = kern->version.major;
  60         info->agp_version_minor = kern->version.minor;
  61         info->mode = kern->mode;
  62         info->aperture_base = kern->aper_base;
  63         info->aperture_size = kern->aper_size * 1024 * 1024;
  64         info->memory_allowed = kern->max_memory << PAGE_SHIFT;
  65         info->memory_used = kern->current_memory << PAGE_SHIFT;
  66         info->id_vendor = kern->device->vendor;
  67         info->id_device = kern->device->device;
  68
  69         return 0;
  70 }
  71
  72 EXPORT_SYMBOL(drm_agp_info);
  73
  74 int drm_agp_info_ioctl(struct inode *inode, struct file *filp,
  75                        unsigned int cmd, unsigned long arg)
  76 {
  77         drm_file_t *priv = filp->private_data;
  78         drm_device_t *dev = priv->head->dev;
  79         drm_agp_info_t info;
  80         int err;
  81
  82         err = drm_agp_info(dev, &info);
  83         if (err)
  84                 return err;
  85
  86         if (copy_to_user((drm_agp_info_t __user *) arg, &info, sizeof(info)))
  87                 return -EFAULT;
  88         return 0;
  89 }
  90
  91 /**
  92  * Acquire the AGP device.
  93  *
  94  * \param dev DRM device that is to acquire AGP
  95  * \return zero on success or a negative number on failure.
  96  *
  97  * Verifies the AGP device hasn't been acquired before and calls
  98  * \c agp_backend_acquire.
  99  */
 100 int drm_agp_acquire(drm_device_t * dev)
 101 {
 102         if (!dev->agp)
 103                 return -ENODEV;
 104         if (dev->agp->acquired)
 105                 return -EBUSY;
 106         if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
 107                 return -ENODEV;
 108         dev->agp->acquired = 1;
 109         return 0;
 110 }
 111
 112 EXPORT_SYMBOL(drm_agp_acquire);
 113
 114 /**
 115  * Acquire the AGP device (ioctl).
 116  *
 117  * \param inode device inode.
 118  * \param filp file pointer.
 119  * \param cmd command.
 120  * \param arg user argument.
 121  * \return zero on success or a negative number on failure.
 122  *
 123  * Verifies the AGP device hasn't been acquired before and calls
 124  * \c agp_backend_acquire.
 125  */
 126 int drm_agp_acquire_ioctl(struct inode *inode, struct file *filp,
 127                           unsigned int cmd, unsigned long arg)
 128 {
 129         drm_file_t *priv = filp->private_data;
 130
 131         return drm_agp_acquire((drm_device_t *) priv->head->dev);
 132 }
 133
 134 /**
 135  * Release the AGP device.
 136  *
 137  * \param dev DRM device that is to release AGP
 138  * \return zero on success or a negative number on failure.
 139  *
 140  * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 141  */
 142 int drm_agp_release(drm_device_t * dev)
 143 {
 144         if (!dev->agp || !dev->agp->acquired)
 145                 return -EINVAL;
 146         agp_backend_release(dev->agp->bridge);
 147         dev->agp->acquired = 0;
 148         return 0;
 149 }
 150
 151 EXPORT_SYMBOL(drm_agp_release);
 152
 153 int drm_agp_release_ioctl(struct inode *inode, struct file *filp,
 154                           unsigned int cmd, unsigned long arg)
 155 {
 156         drm_file_t *priv = filp->private_data;
 157         drm_device_t *dev = priv->head->dev;
 158
 159         return drm_agp_release(dev);
 160 }
 161
 162 /**
 163  * Enable the AGP bus.
 164  *
 165  * \param dev DRM device that has previously acquired AGP.
 166  * \param mode Requested AGP mode.
 167  * \return zero on success or a negative number on failure.
 168  *
 169  * Verifies the AGP device has been acquired but not enabled, and calls
 170  * \c agp_enable.
 171  */
 172 int drm_agp_enable(drm_device_t * dev, drm_agp_mode_t mode)
 173 {
 174         if (!dev->agp || !dev->agp->acquired)
 175                 return -EINVAL;
 176
 177         dev->agp->mode = mode.mode;
 178         agp_enable(dev->agp->bridge, mode.mode);
 179         dev->agp->base = dev->agp->agp_info.aper_base;
 180         dev->agp->enabled = 1;
 181         return 0;
 182 }
 183
 184 EXPORT_SYMBOL(drm_agp_enable);
 185
 186 int drm_agp_enable_ioctl(struct inode *inode, struct file *filp,
 187                          unsigned int cmd, unsigned long arg)
 188 {
 189         drm_file_t *priv = filp->private_data;
 190         drm_device_t *dev = priv->head->dev;
 191         drm_agp_mode_t mode;
 192
 193         if (copy_from_user(&mode, (drm_agp_mode_t __user *) arg, sizeof(mode)))
 194                 return -EFAULT;
 195
 196         return drm_agp_enable(dev, mode);
 197 }
 198
 199 /**
 200  * Allocate AGP memory.
 201  *
 202  * \param inode device inode.
 203  * \param filp file pointer.
 204  * \param cmd command.
 205  * \param arg pointer to a drm_agp_buffer structure.
 206  * \return zero on success or a negative number on failure.
 207  *
 208  * Verifies the AGP device is present and has been acquired, allocates the
 209  * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 210  */
 211 int drm_agp_alloc(struct inode *inode, struct file *filp,
 212                   unsigned int cmd, unsigned long arg)
 213 {
 214         drm_file_t *priv = filp->private_data;
 215         drm_device_t *dev = priv->head->dev;
 216         drm_agp_buffer_t request;
 217         drm_agp_mem_t *entry;
 218         DRM_AGP_MEM *memory;
 219         unsigned long pages;
 220         u32 type;
 221         drm_agp_buffer_t __user *argp = (void __user *)arg;
 222
 223         if (!dev->agp || !dev->agp->acquired)
 224                 return -EINVAL;
 225         if (copy_from_user(&request, argp, sizeof(request)))
 226                 return -EFAULT;
 227         if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
 228                 return -ENOMEM;
 229
 230         memset(entry, 0, sizeof(*entry));
 231
 232         pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
 233         type = (u32) request.type;
 234
 235         if (!(memory = drm_alloc_agp(dev, pages, type))) {
 236                 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 237                 return -ENOMEM;
 238         }
 239
 240         entry->handle = (unsigned long)memory->key + 1;
 241         entry->memory = memory;
 242         entry->bound = 0;
 243         entry->pages = pages;
 244         entry->prev = NULL;
 245         entry->next = dev->agp->memory;
 246         if (dev->agp->memory)
 247                 dev->agp->memory->prev = entry;
 248         dev->agp->memory = entry;
 249
 250         request.handle = entry->handle;
 251         request.physical = memory->physical;
 252
 253         if (copy_to_user(argp, &request, sizeof(request))) {
 254                 dev->agp->memory = entry->next;
 255                 dev->agp->memory->prev = NULL;
 256                 drm_free_agp(memory, pages);
 257                 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 258                 return -EFAULT;
 259         }
 260         return 0;
 261 }
 262
 263 /**
 264  * Search for the AGP memory entry associated with a handle.
 265  *
 266  * \param dev DRM device structure.
 267  * \param handle AGP memory handle.
 268  * \return pointer to the drm_agp_mem structure associated with \p handle.
 269  *
 270  * Walks through drm_agp_head::memory until finding a matching handle.
 271  */
 272 static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t * dev,
 273                                            unsigned long handle)
 274 {
 275         drm_agp_mem_t *entry;
 276
 277         for (entry = dev->agp->memory; entry; entry = entry->next) {
 278                 if (entry->handle == handle)
 279                         return entry;
 280         }
 281         return NULL;
 282 }
 283
 284 /**
 285  * Unbind AGP memory from the GATT (ioctl).
 286  *
 287  * \param inode device inode.
 288  * \param filp file pointer.
 289  * \param cmd command.
 290  * \param arg pointer to a drm_agp_binding structure.
 291  * \return zero on success or a negative number on failure.
 292  *
 293  * Verifies the AGP device is present and acquired, looks-up the AGP memory
 294  * entry and passes it to the unbind_agp() function.
 295  */
 296 int drm_agp_unbind(struct inode *inode, struct file *filp,
 297                    unsigned int cmd, unsigned long arg)
 298 {
 299         drm_file_t *priv = filp->private_data;
 300         drm_device_t *dev = priv->head->dev;
 301         drm_agp_binding_t request;
 302         drm_agp_mem_t *entry;
 303         int ret;
 304
 305         if (!dev->agp || !dev->agp->acquired)
 306                 return -EINVAL;
 307         if (copy_from_user
 308             (&request, (drm_agp_binding_t __user *) arg, sizeof(request)))
 309                 return -EFAULT;
 310         if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
 311                 return -EINVAL;
 312         if (!entry->bound)
 313                 return -EINVAL;
 314         ret = drm_unbind_agp(entry->memory);
 315         if (ret == 0)
 316                 entry->bound = 0;
 317         return ret;
 318 }
 319
 320 /**
 321  * Bind AGP memory into the GATT (ioctl)
 322  *
 323  * \param inode device inode.
 324  * \param filp file pointer.
 325  * \param cmd command.
 326  * \param arg pointer to a drm_agp_binding structure.
 327  * \return zero on success or a negative number on failure.
 328  *
 329  * Verifies the AGP device is present and has been acquired and that no memory
 330  * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 331  * it to bind_agp() function.
 332  */
 333 int drm_agp_bind(struct inode *inode, struct file *filp,
 334                  unsigned int cmd, unsigned long arg)
 335 {
 336         drm_file_t *priv = filp->private_data;
 337         drm_device_t *dev = priv->head->dev;
 338         drm_agp_binding_t request;
 339         drm_agp_mem_t *entry;
 340         int retcode;
 341         int page;
 342
 343         if (!dev->agp || !dev->agp->acquired)
 344                 return -EINVAL;
 345         if (copy_from_user
 346             (&request, (drm_agp_binding_t __user *) arg, sizeof(request)))
 347                 return -EFAULT;
 348         if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
 349                 return -EINVAL;
 350         if (entry->bound)
 351                 return -EINVAL;
 352         page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
 353         if ((retcode = drm_bind_agp(entry->memory, page)))
 354                 return retcode;
 355         entry->bound = dev->agp->base + (page << PAGE_SHIFT);
 356         DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
 357                   dev->agp->base, entry->bound);
 358         return 0;
 359 }
 360
 361 /**
 362  * Free AGP memory (ioctl).
 363  *
 364  * \param inode device inode.
 365  * \param filp file pointer.
 366  * \param cmd command.
 367  * \param arg pointer to a drm_agp_buffer structure.
 368  * \return zero on success or a negative number on failure.
 369  *
 370  * Verifies the AGP device is present and has been acquired and looks up the
 371  * AGP memory entry. If the memory it's currently bound, unbind it via
 372  * unbind_agp(). Frees it via free_agp() as well as the entry itself
 373  * and unlinks from the doubly linked list it's inserted in.
 374  */
 375 int drm_agp_free(struct inode *inode, struct file *filp,
 376                  unsigned int cmd, unsigned long arg)
 377 {
 378         drm_file_t *priv = filp->private_data;
 379         drm_device_t *dev = priv->head->dev;
 380         drm_agp_buffer_t request;
 381         drm_agp_mem_t *entry;
 382
 383         if (!dev->agp || !dev->agp->acquired)
 384                 return -EINVAL;
 385         if (copy_from_user
 386             (&request, (drm_agp_buffer_t __user *) arg, sizeof(request)))
 387                 return -EFAULT;
 388         if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
 389                 return -EINVAL;
 390         if (entry->bound)
 391                 drm_unbind_agp(entry->memory);
 392
 393         if (entry->prev)
 394                 entry->prev->next = entry->next;
 395         else
 396                 dev->agp->memory = entry->next;
 397
 398         if (entry->next)
 399                 entry->next->prev = entry->prev;
 400
 401         drm_free_agp(entry->memory, entry->pages);
 402         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 403         return 0;
 404 }
 405
 406 /**
 407  * Initialize the AGP resources.
 408  *
 409  * \return pointer to a drm_agp_head structure.
 410  *
 411  */
 412 drm_agp_head_t *drm_agp_init(drm_device_t * dev)
 413 {
 414         drm_agp_head_t *head = NULL;
 415
 416         if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
 417                 return NULL;
 418         memset((void *)head, 0, sizeof(*head));
 419         head->bridge = agp_find_bridge(dev->pdev);
 420         if (!head->bridge) {
 421                 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
 422                         drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 423                         return NULL;
 424                 }
 425                 agp_copy_info(head->bridge, &head->agp_info);
 426                 agp_backend_release(head->bridge);
 427         } else {
 428                 agp_copy_info(head->bridge, &head->agp_info);
 429         }
 430         if (head->agp_info.chipset == NOT_SUPPORTED) {
 431                 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 432                 return NULL;
 433         }
 434         head->memory = NULL;
 435         head->cant_use_aperture = head->agp_info.cant_use_aperture;
 436         head->page_mask = head->agp_info.page_mask;
 437
 438         return head;
 439 }
 440
 441 /** Calls agp_allocate_memory() */
 442 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
 443                                      size_t pages, u32 type)
 444 {
 445         return agp_allocate_memory(bridge, pages, type);
 446 }
 447
 448 /** Calls agp_free_memory() */
 449 int drm_agp_free_memory(DRM_AGP_MEM * handle)
 450 {
 451         if (!handle)
 452                 return 0;
 453         agp_free_memory(handle);
 454         return 1;
 455 }
 456
 457 /** Calls agp_bind_memory() */
 458 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
 459 {
 460         if (!handle)
 461                 return -EINVAL;
 462         return agp_bind_memory(handle, start);
 463 }
 464
 465 EXPORT_SYMBOL(drm_agp_bind_memory);
 466
 467 /** Calls agp_unbind_memory() */
 468 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
 469 {
 470         if (!handle)
 471                 return -EINVAL;
 472         return agp_unbind_memory(handle);
 473 }
 474
 475 #endif                          /* __OS_HAS_AGP */