drivers/char/drm/drm_agpsupport.c

   1 /**
   2  * \file drm_agpsupport.c
   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 file_priv DRM file private.
  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(struct drm_device *dev, struct drm_agp_info *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 drm_device *dev, void *data,
  75                        struct drm_file *file_priv)
  76 {
  77         struct drm_agp_info *info = data;
  78         int err;
  79
  80         err = drm_agp_info(dev, info);
  81         if (err)
  82                 return err;
  83
  84         return 0;
  85 }
  86
  87 /**
  88  * Acquire the AGP device.
  89  *
  90  * \param dev DRM device that is to acquire AGP.
  91  * \return zero on success or a negative number on failure.
  92  *
  93  * Verifies the AGP device hasn't been acquired before and calls
  94  * \c agp_backend_acquire.
  95  */
  96 int drm_agp_acquire(struct drm_device * dev)
  97 {
  98         if (!dev->agp)
  99                 return -ENODEV;
 100         if (dev->agp->acquired)
 101                 return -EBUSY;
 102         if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
 103                 return -ENODEV;
 104         dev->agp->acquired = 1;
 105         return 0;
 106 }
 107
 108 EXPORT_SYMBOL(drm_agp_acquire);
 109
 110 /**
 111  * Acquire the AGP device (ioctl).
 112  *
 113  * \param inode device inode.
 114  * \param file_priv DRM file private.
 115  * \param cmd command.
 116  * \param arg user argument.
 117  * \return zero on success or a negative number on failure.
 118  *
 119  * Verifies the AGP device hasn't been acquired before and calls
 120  * \c agp_backend_acquire.
 121  */
 122 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
 123                           struct drm_file *file_priv)
 124 {
 125         return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
 126 }
 127
 128 /**
 129  * Release the AGP device.
 130  *
 131  * \param dev DRM device that is to release AGP.
 132  * \return zero on success or a negative number on failure.
 133  *
 134  * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 135  */
 136 int drm_agp_release(struct drm_device * dev)
 137 {
 138         if (!dev->agp || !dev->agp->acquired)
 139                 return -EINVAL;
 140         agp_backend_release(dev->agp->bridge);
 141         dev->agp->acquired = 0;
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(drm_agp_release);
 145
 146 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
 147                           struct drm_file *file_priv)
 148 {
 149         return drm_agp_release(dev);
 150 }
 151
 152 /**
 153  * Enable the AGP bus.
 154  *
 155  * \param dev DRM device that has previously acquired AGP.
 156  * \param mode Requested AGP mode.
 157  * \return zero on success or a negative number on failure.
 158  *
 159  * Verifies the AGP device has been acquired but not enabled, and calls
 160  * \c agp_enable.
 161  */
 162 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
 163 {
 164         if (!dev->agp || !dev->agp->acquired)
 165                 return -EINVAL;
 166
 167         dev->agp->mode = mode.mode;
 168         agp_enable(dev->agp->bridge, mode.mode);
 169         dev->agp->enabled = 1;
 170         return 0;
 171 }
 172
 173 EXPORT_SYMBOL(drm_agp_enable);
 174
 175 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
 176                          struct drm_file *file_priv)
 177 {
 178         struct drm_agp_mode *mode = data;
 179
 180         return drm_agp_enable(dev, *mode);
 181 }
 182
 183 /**
 184  * Allocate AGP memory.
 185  *
 186  * \param inode device inode.
 187  * \param file_priv file private pointer.
 188  * \param cmd command.
 189  * \param arg pointer to a drm_agp_buffer structure.
 190  * \return zero on success or a negative number on failure.
 191  *
 192  * Verifies the AGP device is present and has been acquired, allocates the
 193  * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 194  */
 195 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
 196 {
 197         struct drm_agp_mem *entry;
 198         DRM_AGP_MEM *memory;
 199         unsigned long pages;
 200         u32 type;
 201
 202         if (!dev->agp || !dev->agp->acquired)
 203                 return -EINVAL;
 204         if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
 205                 return -ENOMEM;
 206
 207         memset(entry, 0, sizeof(*entry));
 208
 209         pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
 210         type = (u32) request->type;
 211         if (!(memory = drm_alloc_agp(dev, pages, type))) {
 212                 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 213                 return -ENOMEM;
 214         }
 215
 216         entry->handle = (unsigned long)memory->key + 1;
 217         entry->memory = memory;
 218         entry->bound = 0;
 219         entry->pages = pages;
 220         list_add(&entry->head, &dev->agp->memory);
 221
 222         request->handle = entry->handle;
 223         request->physical = memory->physical;
 224
 225         return 0;
 226 }
 227 EXPORT_SYMBOL(drm_agp_alloc);
 228
 229
 230 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
 231                         struct drm_file *file_priv)
 232 {
 233         struct drm_agp_buffer *request = data;
 234
 235         return drm_agp_alloc(dev, request);
 236 }
 237
 238 /**
 239  * Search for the AGP memory entry associated with a handle.
 240  *
 241  * \param dev DRM device structure.
 242  * \param handle AGP memory handle.
 243  * \return pointer to the drm_agp_mem structure associated with \p handle.
 244  *
 245  * Walks through drm_agp_head::memory until finding a matching handle.
 246  */
 247 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
 248                                            unsigned long handle)
 249 {
 250         struct drm_agp_mem *entry;
 251
 252         list_for_each_entry(entry, &dev->agp->memory, head) {
 253                 if (entry->handle == handle)
 254                         return entry;
 255         }
 256         return NULL;
 257 }
 258
 259 /**
 260  * Unbind AGP memory from the GATT (ioctl).
 261  *
 262  * \param inode device inode.
 263  * \param file_priv DRM file private.
 264  * \param cmd command.
 265  * \param arg pointer to a drm_agp_binding structure.
 266  * \return zero on success or a negative number on failure.
 267  *
 268  * Verifies the AGP device is present and acquired, looks-up the AGP memory
 269  * entry and passes it to the unbind_agp() function.
 270  */
 271 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
 272 {
 273         struct drm_agp_mem *entry;
 274         int ret;
 275
 276         if (!dev->agp || !dev->agp->acquired)
 277                 return -EINVAL;
 278         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 279                 return -EINVAL;
 280         if (!entry->bound)
 281                 return -EINVAL;
 282         ret = drm_unbind_agp(entry->memory);
 283         if (ret == 0)
 284                 entry->bound = 0;
 285         return ret;
 286 }
 287 EXPORT_SYMBOL(drm_agp_unbind);
 288
 289
 290 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
 291                          struct drm_file *file_priv)
 292 {
 293         struct drm_agp_binding *request = data;
 294
 295         return drm_agp_unbind(dev, request);
 296 }
 297
 298 /**
 299  * Bind AGP memory into the GATT (ioctl)
 300  *
 301  * \param inode device inode.
 302  * \param file_priv DRM file private.
 303  * \param cmd command.
 304  * \param arg pointer to a drm_agp_binding structure.
 305  * \return zero on success or a negative number on failure.
 306  *
 307  * Verifies the AGP device is present and has been acquired and that no memory
 308  * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 309  * it to bind_agp() function.
 310  */
 311 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
 312 {
 313         struct drm_agp_mem *entry;
 314         int retcode;
 315         int page;
 316
 317         if (!dev->agp || !dev->agp->acquired)
 318                 return -EINVAL;
 319         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 320                 return -EINVAL;
 321         if (entry->bound)
 322                 return -EINVAL;
 323         page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
 324         if ((retcode = drm_bind_agp(entry->memory, page)))
 325                 return retcode;
 326         entry->bound = dev->agp->base + (page << PAGE_SHIFT);
 327         DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
 328                   dev->agp->base, entry->bound);
 329         return 0;
 330 }
 331 EXPORT_SYMBOL(drm_agp_bind);
 332
 333
 334 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
 335                        struct drm_file *file_priv)
 336 {
 337         struct drm_agp_binding *request = data;
 338
 339         return drm_agp_bind(dev, request);
 340 }
 341
 342 /**
 343  * Free AGP memory (ioctl).
 344  *
 345  * \param inode device inode.
 346  * \param file_priv DRM file private.
 347  * \param cmd command.
 348  * \param arg pointer to a drm_agp_buffer structure.
 349  * \return zero on success or a negative number on failure.
 350  *
 351  * Verifies the AGP device is present and has been acquired and looks up the
 352  * AGP memory entry. If the memory it's currently bound, unbind it via
 353  * unbind_agp(). Frees it via free_agp() as well as the entry itself
 354  * and unlinks from the doubly linked list it's inserted in.
 355  */
 356 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
 357 {
 358         struct drm_agp_mem *entry;
 359
 360         if (!dev->agp || !dev->agp->acquired)
 361                 return -EINVAL;
 362         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 363                 return -EINVAL;
 364         if (entry->bound)
 365                 drm_unbind_agp(entry->memory);
 366
 367         list_del(&entry->head);
 368
 369         drm_free_agp(entry->memory, entry->pages);
 370         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 371         return 0;
 372 }
 373 EXPORT_SYMBOL(drm_agp_free);
 374
 375
 376
 377 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
 378                        struct drm_file *file_priv)
 379 {
 380         struct drm_agp_buffer *request = data;
 381
 382         return drm_agp_free(dev, request);
 383 }
 384
 385 /**
 386  * Initialize the AGP resources.
 387  *
 388  * \return pointer to a drm_agp_head structure.
 389  *
 390  * Gets the drm_agp_t structure which is made available by the agpgart module
 391  * via the inter_module_* functions. Creates and initializes a drm_agp_head
 392  * structure.
 393  */
 394 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 395 {
 396         struct drm_agp_head *head = NULL;
 397
 398         if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
 399                 return NULL;
 400         memset((void *)head, 0, sizeof(*head));
 401         head->bridge = agp_find_bridge(dev->pdev);
 402         if (!head->bridge) {
 403                 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
 404                         drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 405                         return NULL;
 406                 }
 407                 agp_copy_info(head->bridge, &head->agp_info);
 408                 agp_backend_release(head->bridge);
 409         } else {
 410                 agp_copy_info(head->bridge, &head->agp_info);
 411         }
 412         if (head->agp_info.chipset == NOT_SUPPORTED) {
 413                 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 414                 return NULL;
 415         }
 416         INIT_LIST_HEAD(&head->memory);
 417         head->cant_use_aperture = head->agp_info.cant_use_aperture;
 418         head->page_mask = head->agp_info.page_mask;
 419         head->base = head->agp_info.aper_base;
 420         return head;
 421 }
 422
 423 /** Calls agp_allocate_memory() */
 424 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
 425                                      size_t pages, u32 type)
 426 {
 427         return agp_allocate_memory(bridge, pages, type);
 428 }
 429
 430 /** Calls agp_free_memory() */
 431 int drm_agp_free_memory(DRM_AGP_MEM * handle)
 432 {
 433         if (!handle)
 434                 return 0;
 435         agp_free_memory(handle);
 436         return 1;
 437 }
 438
 439 /** Calls agp_bind_memory() */
 440 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
 441 {
 442         if (!handle)
 443                 return -EINVAL;
 444         return agp_bind_memory(handle, start);
 445 }
 446
 447 /** Calls agp_unbind_memory() */
 448 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
 449 {
 450         if (!handle)
 451                 return -EINVAL;
 452         return agp_unbind_memory(handle);
 453 }
 454
 455 #endif                          /* __OS_HAS_AGP */