drivers/gpu/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 #include <asm/agp.h>
  40
  41 /**
  42  * Get AGP information.
  43  *
  44  * \param inode device inode.
  45  * \param file_priv DRM file private.
  46  * \param cmd command.
  47  * \param arg pointer to a (output) drm_agp_info structure.
  48  * \return zero on success or a negative number on failure.
  49  *
  50  * Verifies the AGP device has been initialized and acquired and fills in the
  51  * drm_agp_info structure with the information in drm_agp_head::agp_info.
  52  */
  53 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
  54 {
  55         DRM_AGP_KERN *kern;
  56
  57         if (!dev->agp || !dev->agp->acquired)
  58                 return -EINVAL;
  59
  60         kern = &dev->agp->agp_info;
  61         info->agp_version_major = kern->version.major;
  62         info->agp_version_minor = kern->version.minor;
  63         info->mode = kern->mode;
  64         info->aperture_base = kern->aper_base;
  65         info->aperture_size = kern->aper_size * 1024 * 1024;
  66         info->memory_allowed = kern->max_memory << PAGE_SHIFT;
  67         info->memory_used = kern->current_memory << PAGE_SHIFT;
  68         info->id_vendor = kern->device->vendor;
  69         info->id_device = kern->device->device;
  70
  71         return 0;
  72 }
  73
  74 EXPORT_SYMBOL(drm_agp_info);
  75
  76 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
  77                        struct drm_file *file_priv)
  78 {
  79         struct drm_agp_info *info = data;
  80         int err;
  81
  82         err = drm_agp_info(dev, info);
  83         if (err)
  84                 return err;
  85
  86         return 0;
  87 }
  88
  89 /**
  90  * Acquire the AGP device.
  91  *
  92  * \param dev DRM device that is to acquire AGP.
  93  * \return zero on success or a negative number on failure.
  94  *
  95  * Verifies the AGP device hasn't been acquired before and calls
  96  * \c agp_backend_acquire.
  97  */
  98 int drm_agp_acquire(struct drm_device * dev)
  99 {
 100         if (!dev->agp)
 101                 return -ENODEV;
 102         if (dev->agp->acquired)
 103                 return -EBUSY;
 104         if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
 105                 return -ENODEV;
 106         dev->agp->acquired = 1;
 107         return 0;
 108 }
 109
 110 EXPORT_SYMBOL(drm_agp_acquire);
 111
 112 /**
 113  * Acquire the AGP device (ioctl).
 114  *
 115  * \param inode device inode.
 116  * \param file_priv DRM file private.
 117  * \param cmd command.
 118  * \param arg user argument.
 119  * \return zero on success or a negative number on failure.
 120  *
 121  * Verifies the AGP device hasn't been acquired before and calls
 122  * \c agp_backend_acquire.
 123  */
 124 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
 125                           struct drm_file *file_priv)
 126 {
 127         return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
 128 }
 129
 130 /**
 131  * Release the AGP device.
 132  *
 133  * \param dev DRM device that is to release AGP.
 134  * \return zero on success or a negative number on failure.
 135  *
 136  * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 137  */
 138 int drm_agp_release(struct drm_device * dev)
 139 {
 140         if (!dev->agp || !dev->agp->acquired)
 141                 return -EINVAL;
 142         agp_backend_release(dev->agp->bridge);
 143         dev->agp->acquired = 0;
 144         return 0;
 145 }
 146 EXPORT_SYMBOL(drm_agp_release);
 147
 148 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
 149                           struct drm_file *file_priv)
 150 {
 151         return drm_agp_release(dev);
 152 }
 153
 154 /**
 155  * Enable the AGP bus.
 156  *
 157  * \param dev DRM device that has previously acquired AGP.
 158  * \param mode Requested AGP mode.
 159  * \return zero on success or a negative number on failure.
 160  *
 161  * Verifies the AGP device has been acquired but not enabled, and calls
 162  * \c agp_enable.
 163  */
 164 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
 165 {
 166         if (!dev->agp || !dev->agp->acquired)
 167                 return -EINVAL;
 168
 169         dev->agp->mode = mode.mode;
 170         agp_enable(dev->agp->bridge, mode.mode);
 171         dev->agp->enabled = 1;
 172         return 0;
 173 }
 174
 175 EXPORT_SYMBOL(drm_agp_enable);
 176
 177 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
 178                          struct drm_file *file_priv)
 179 {
 180         struct drm_agp_mode *mode = data;
 181
 182         return drm_agp_enable(dev, *mode);
 183 }
 184
 185 /**
 186  * Allocate AGP memory.
 187  *
 188  * \param inode device inode.
 189  * \param file_priv file private pointer.
 190  * \param cmd command.
 191  * \param arg pointer to a drm_agp_buffer structure.
 192  * \return zero on success or a negative number on failure.
 193  *
 194  * Verifies the AGP device is present and has been acquired, allocates the
 195  * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 196  */
 197 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
 198 {
 199         struct drm_agp_mem *entry;
 200         DRM_AGP_MEM *memory;
 201         unsigned long pages;
 202         u32 type;
 203
 204         if (!dev->agp || !dev->agp->acquired)
 205                 return -EINVAL;
 206         if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
 207                 return -ENOMEM;
 208
 209         memset(entry, 0, sizeof(*entry));
 210
 211         pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
 212         type = (u32) request->type;
 213         if (!(memory = drm_alloc_agp(dev, pages, type))) {
 214                 kfree(entry);
 215                 return -ENOMEM;
 216         }
 217
 218         entry->handle = (unsigned long)memory->key + 1;
 219         entry->memory = memory;
 220         entry->bound = 0;
 221         entry->pages = pages;
 222         list_add(&entry->head, &dev->agp->memory);
 223
 224         request->handle = entry->handle;
 225         request->physical = memory->physical;
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL(drm_agp_alloc);
 230
 231
 232 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
 233                         struct drm_file *file_priv)
 234 {
 235         struct drm_agp_buffer *request = data;
 236
 237         return drm_agp_alloc(dev, request);
 238 }
 239
 240 /**
 241  * Search for the AGP memory entry associated with a handle.
 242  *
 243  * \param dev DRM device structure.
 244  * \param handle AGP memory handle.
 245  * \return pointer to the drm_agp_mem structure associated with \p handle.
 246  *
 247  * Walks through drm_agp_head::memory until finding a matching handle.
 248  */
 249 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
 250                                            unsigned long handle)
 251 {
 252         struct drm_agp_mem *entry;
 253
 254         list_for_each_entry(entry, &dev->agp->memory, head) {
 255                 if (entry->handle == handle)
 256                         return entry;
 257         }
 258         return NULL;
 259 }
 260
 261 /**
 262  * Unbind AGP memory from the GATT (ioctl).
 263  *
 264  * \param inode device inode.
 265  * \param file_priv DRM file private.
 266  * \param cmd command.
 267  * \param arg pointer to a drm_agp_binding structure.
 268  * \return zero on success or a negative number on failure.
 269  *
 270  * Verifies the AGP device is present and acquired, looks-up the AGP memory
 271  * entry and passes it to the unbind_agp() function.
 272  */
 273 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
 274 {
 275         struct drm_agp_mem *entry;
 276         int ret;
 277
 278         if (!dev->agp || !dev->agp->acquired)
 279                 return -EINVAL;
 280         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 281                 return -EINVAL;
 282         if (!entry->bound)
 283                 return -EINVAL;
 284         ret = drm_unbind_agp(entry->memory);
 285         if (ret == 0)
 286                 entry->bound = 0;
 287         return ret;
 288 }
 289 EXPORT_SYMBOL(drm_agp_unbind);
 290
 291
 292 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
 293                          struct drm_file *file_priv)
 294 {
 295         struct drm_agp_binding *request = data;
 296
 297         return drm_agp_unbind(dev, request);
 298 }
 299
 300 /**
 301  * Bind AGP memory into the GATT (ioctl)
 302  *
 303  * \param inode device inode.
 304  * \param file_priv DRM file private.
 305  * \param cmd command.
 306  * \param arg pointer to a drm_agp_binding structure.
 307  * \return zero on success or a negative number on failure.
 308  *
 309  * Verifies the AGP device is present and has been acquired and that no memory
 310  * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 311  * it to bind_agp() function.
 312  */
 313 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
 314 {
 315         struct drm_agp_mem *entry;
 316         int retcode;
 317         int page;
 318
 319         if (!dev->agp || !dev->agp->acquired)
 320                 return -EINVAL;
 321         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 322                 return -EINVAL;
 323         if (entry->bound)
 324                 return -EINVAL;
 325         page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
 326         if ((retcode = drm_bind_agp(entry->memory, page)))
 327                 return retcode;
 328         entry->bound = dev->agp->base + (page << PAGE_SHIFT);
 329         DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
 330                   dev->agp->base, entry->bound);
 331         return 0;
 332 }
 333 EXPORT_SYMBOL(drm_agp_bind);
 334
 335
 336 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
 337                        struct drm_file *file_priv)
 338 {
 339         struct drm_agp_binding *request = data;
 340
 341         return drm_agp_bind(dev, request);
 342 }
 343
 344 /**
 345  * Free AGP memory (ioctl).
 346  *
 347  * \param inode device inode.
 348  * \param file_priv DRM file private.
 349  * \param cmd command.
 350  * \param arg pointer to a drm_agp_buffer structure.
 351  * \return zero on success or a negative number on failure.
 352  *
 353  * Verifies the AGP device is present and has been acquired and looks up the
 354  * AGP memory entry. If the memory it's currently bound, unbind it via
 355  * unbind_agp(). Frees it via free_agp() as well as the entry itself
 356  * and unlinks from the doubly linked list it's inserted in.
 357  */
 358 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
 359 {
 360         struct drm_agp_mem *entry;
 361
 362         if (!dev->agp || !dev->agp->acquired)
 363                 return -EINVAL;
 364         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 365                 return -EINVAL;
 366         if (entry->bound)
 367                 drm_unbind_agp(entry->memory);
 368
 369         list_del(&entry->head);
 370
 371         drm_free_agp(entry->memory, entry->pages);
 372         kfree(entry);
 373         return 0;
 374 }
 375 EXPORT_SYMBOL(drm_agp_free);
 376
 377
 378
 379 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
 380                        struct drm_file *file_priv)
 381 {
 382         struct drm_agp_buffer *request = data;
 383
 384         return drm_agp_free(dev, request);
 385 }
 386
 387 /**
 388  * Initialize the AGP resources.
 389  *
 390  * \return pointer to a drm_agp_head structure.
 391  *
 392  * Gets the drm_agp_t structure which is made available by the agpgart module
 393  * via the inter_module_* functions. Creates and initializes a drm_agp_head
 394  * structure.
 395  */
 396 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 397 {
 398         struct drm_agp_head *head = NULL;
 399
 400         if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
 401                 return NULL;
 402         memset((void *)head, 0, sizeof(*head));
 403         head->bridge = agp_find_bridge(dev->pdev);
 404         if (!head->bridge) {
 405                 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
 406                         kfree(head);
 407                         return NULL;
 408                 }
 409                 agp_copy_info(head->bridge, &head->agp_info);
 410                 agp_backend_release(head->bridge);
 411         } else {
 412                 agp_copy_info(head->bridge, &head->agp_info);
 413         }
 414         if (head->agp_info.chipset == NOT_SUPPORTED) {
 415                 kfree(head);
 416                 return NULL;
 417         }
 418         INIT_LIST_HEAD(&head->memory);
 419         head->cant_use_aperture = head->agp_info.cant_use_aperture;
 420         head->page_mask = head->agp_info.page_mask;
 421         head->base = head->agp_info.aper_base;
 422         return head;
 423 }
 424
 425 /** Calls agp_allocate_memory() */
 426 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
 427                                      size_t pages, u32 type)
 428 {
 429         return agp_allocate_memory(bridge, pages, type);
 430 }
 431
 432 /** Calls agp_free_memory() */
 433 int drm_agp_free_memory(DRM_AGP_MEM * handle)
 434 {
 435         if (!handle)
 436                 return 0;
 437         agp_free_memory(handle);
 438         return 1;
 439 }
 440
 441 /** Calls agp_bind_memory() */
 442 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
 443 {
 444         if (!handle)
 445                 return -EINVAL;
 446         return agp_bind_memory(handle, start);
 447 }
 448
 449 /** Calls agp_unbind_memory() */
 450 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
 451 {
 452         if (!handle)
 453                 return -EINVAL;
 454         return agp_unbind_memory(handle);
 455 }
 456
 457 /**
 458  * Binds a collection of pages into AGP memory at the given offset, returning
 459  * the AGP memory structure containing them.
 460  *
 461  * No reference is held on the pages during this time -- it is up to the
 462  * caller to handle that.
 463  */
 464 DRM_AGP_MEM *
 465 drm_agp_bind_pages(struct drm_device *dev,
 466                    struct page **pages,
 467                    unsigned long num_pages,
 468                    uint32_t gtt_offset,
 469                    u32 type)
 470 {
 471         DRM_AGP_MEM *mem;
 472         int ret, i;
 473
 474         DRM_DEBUG("\n");
 475
 476         mem = drm_agp_allocate_memory(dev->agp->bridge, num_pages,
 477                                       type);
 478         if (mem == NULL) {
 479                 DRM_ERROR("Failed to allocate memory for %ld pages\n",
 480                           num_pages);
 481                 return NULL;
 482         }
 483
 484         for (i = 0; i < num_pages; i++)
 485                 mem->memory[i] = phys_to_gart(page_to_phys(pages[i]));
 486         mem->page_count = num_pages;
 487
 488         mem->is_flushed = true;
 489         ret = drm_agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
 490         if (ret != 0) {
 491                 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
 492                 agp_free_memory(mem);
 493                 return NULL;
 494         }
 495
 496         return mem;
 497 }
 498 EXPORT_SYMBOL(drm_agp_bind_pages);
 499
 500 void drm_agp_chipset_flush(struct drm_device *dev)
 501 {
 502         agp_flush_chipset(dev->agp->bridge);
 503 }
 504 EXPORT_SYMBOL(drm_agp_chipset_flush);
 505
 506 #endif /* __OS_HAS_AGP */