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 #include <asm/agp.h>
  37
  38 #if __OS_HAS_AGP
  39
  40 /**
  41  * Get AGP information.
  42  *
  43  * \param inode device inode.
  44  * \param file_priv DRM file private.
  45  * \param cmd command.
  46  * \param arg pointer to a (output) drm_agp_info structure.
  47  * \return zero on success or a negative number on failure.
  48  *
  49  * Verifies the AGP device has been initialized and acquired and fills in the
  50  * drm_agp_info structure with the information in drm_agp_head::agp_info.
  51  */
  52 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
  53 {
  54         DRM_AGP_KERN *kern;
  55
  56         if (!dev->agp || !dev->agp->acquired)
  57                 return -EINVAL;
  58
  59         kern = &dev->agp->agp_info;
  60         info->agp_version_major = kern->version.major;
  61         info->agp_version_minor = kern->version.minor;
  62         info->mode = kern->mode;
  63         info->aperture_base = kern->aper_base;
  64         info->aperture_size = kern->aper_size * 1024 * 1024;
  65         info->memory_allowed = kern->max_memory << PAGE_SHIFT;
  66         info->memory_used = kern->current_memory << PAGE_SHIFT;
  67         info->id_vendor = kern->device->vendor;
  68         info->id_device = kern->device->device;
  69
  70         return 0;
  71 }
  72
  73 EXPORT_SYMBOL(drm_agp_info);
  74
  75 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
  76                        struct drm_file *file_priv)
  77 {
  78         struct drm_agp_info *info = data;
  79         int err;
  80
  81         err = drm_agp_info(dev, info);
  82         if (err)
  83                 return err;
  84
  85         return 0;
  86 }
  87
  88 /**
  89  * Acquire the AGP device.
  90  *
  91  * \param dev DRM device that is to acquire AGP.
  92  * \return zero on success or a negative number on failure.
  93  *
  94  * Verifies the AGP device hasn't been acquired before and calls
  95  * \c agp_backend_acquire.
  96  */
  97 int drm_agp_acquire(struct drm_device * dev)
  98 {
  99         if (!dev->agp)
 100                 return -ENODEV;
 101         if (dev->agp->acquired)
 102                 return -EBUSY;
 103         if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
 104                 return -ENODEV;
 105         dev->agp->acquired = 1;
 106         return 0;
 107 }
 108
 109 EXPORT_SYMBOL(drm_agp_acquire);
 110
 111 /**
 112  * Acquire the AGP device (ioctl).
 113  *
 114  * \param inode device inode.
 115  * \param file_priv DRM file private.
 116  * \param cmd command.
 117  * \param arg user argument.
 118  * \return zero on success or a negative number on failure.
 119  *
 120  * Verifies the AGP device hasn't been acquired before and calls
 121  * \c agp_backend_acquire.
 122  */
 123 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
 124                           struct drm_file *file_priv)
 125 {
 126         return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
 127 }
 128
 129 /**
 130  * Release the AGP device.
 131  *
 132  * \param dev DRM device that is to release AGP.
 133  * \return zero on success or a negative number on failure.
 134  *
 135  * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 136  */
 137 int drm_agp_release(struct drm_device * dev)
 138 {
 139         if (!dev->agp || !dev->agp->acquired)
 140                 return -EINVAL;
 141         agp_backend_release(dev->agp->bridge);
 142         dev->agp->acquired = 0;
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(drm_agp_release);
 146
 147 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
 148                           struct drm_file *file_priv)
 149 {
 150         return drm_agp_release(dev);
 151 }
 152
 153 /**
 154  * Enable the AGP bus.
 155  *
 156  * \param dev DRM device that has previously acquired AGP.
 157  * \param mode Requested AGP mode.
 158  * \return zero on success or a negative number on failure.
 159  *
 160  * Verifies the AGP device has been acquired but not enabled, and calls
 161  * \c agp_enable.
 162  */
 163 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
 164 {
 165         if (!dev->agp || !dev->agp->acquired)
 166                 return -EINVAL;
 167
 168         dev->agp->mode = mode.mode;
 169         agp_enable(dev->agp->bridge, mode.mode);
 170         dev->agp->enabled = 1;
 171         return 0;
 172 }
 173
 174 EXPORT_SYMBOL(drm_agp_enable);
 175
 176 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
 177                          struct drm_file *file_priv)
 178 {
 179         struct drm_agp_mode *mode = data;
 180
 181         return drm_agp_enable(dev, *mode);
 182 }
 183
 184 /**
 185  * Allocate AGP memory.
 186  *
 187  * \param inode device inode.
 188  * \param file_priv file private pointer.
 189  * \param cmd command.
 190  * \param arg pointer to a drm_agp_buffer structure.
 191  * \return zero on success or a negative number on failure.
 192  *
 193  * Verifies the AGP device is present and has been acquired, allocates the
 194  * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 195  */
 196 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
 197 {
 198         struct drm_agp_mem *entry;
 199         DRM_AGP_MEM *memory;
 200         unsigned long pages;
 201         u32 type;
 202
 203         if (!dev->agp || !dev->agp->acquired)
 204                 return -EINVAL;
 205         if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
 206                 return -ENOMEM;
 207
 208         memset(entry, 0, sizeof(*entry));
 209
 210         pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
 211         type = (u32) request->type;
 212         if (!(memory = drm_alloc_agp(dev, pages, type))) {
 213                 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 214                 return -ENOMEM;
 215         }
 216
 217         entry->handle = (unsigned long)memory->key + 1;
 218         entry->memory = memory;
 219         entry->bound = 0;
 220         entry->pages = pages;
 221         list_add(&entry->head, &dev->agp->memory);
 222
 223         request->handle = entry->handle;
 224         request->physical = memory->physical;
 225
 226         return 0;
 227 }
 228 EXPORT_SYMBOL(drm_agp_alloc);
 229
 230
 231 int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
 232                         struct drm_file *file_priv)
 233 {
 234         struct drm_agp_buffer *request = data;
 235
 236         return drm_agp_alloc(dev, request);
 237 }
 238
 239 /**
 240  * Search for the AGP memory entry associated with a handle.
 241  *
 242  * \param dev DRM device structure.
 243  * \param handle AGP memory handle.
 244  * \return pointer to the drm_agp_mem structure associated with \p handle.
 245  *
 246  * Walks through drm_agp_head::memory until finding a matching handle.
 247  */
 248 static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
 249                                            unsigned long handle)
 250 {
 251         struct drm_agp_mem *entry;
 252
 253         list_for_each_entry(entry, &dev->agp->memory, head) {
 254                 if (entry->handle == handle)
 255                         return entry;
 256         }
 257         return NULL;
 258 }
 259
 260 /**
 261  * Unbind AGP memory from the GATT (ioctl).
 262  *
 263  * \param inode device inode.
 264  * \param file_priv DRM file private.
 265  * \param cmd command.
 266  * \param arg pointer to a drm_agp_binding structure.
 267  * \return zero on success or a negative number on failure.
 268  *
 269  * Verifies the AGP device is present and acquired, looks-up the AGP memory
 270  * entry and passes it to the unbind_agp() function.
 271  */
 272 int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
 273 {
 274         struct drm_agp_mem *entry;
 275         int ret;
 276
 277         if (!dev->agp || !dev->agp->acquired)
 278                 return -EINVAL;
 279         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 280                 return -EINVAL;
 281         if (!entry->bound)
 282                 return -EINVAL;
 283         ret = drm_unbind_agp(entry->memory);
 284         if (ret == 0)
 285                 entry->bound = 0;
 286         return ret;
 287 }
 288 EXPORT_SYMBOL(drm_agp_unbind);
 289
 290
 291 int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
 292                          struct drm_file *file_priv)
 293 {
 294         struct drm_agp_binding *request = data;
 295
 296         return drm_agp_unbind(dev, request);
 297 }
 298
 299 /**
 300  * Bind AGP memory into the GATT (ioctl)
 301  *
 302  * \param inode device inode.
 303  * \param file_priv DRM file private.
 304  * \param cmd command.
 305  * \param arg pointer to a drm_agp_binding structure.
 306  * \return zero on success or a negative number on failure.
 307  *
 308  * Verifies the AGP device is present and has been acquired and that no memory
 309  * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 310  * it to bind_agp() function.
 311  */
 312 int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
 313 {
 314         struct drm_agp_mem *entry;
 315         int retcode;
 316         int page;
 317
 318         if (!dev->agp || !dev->agp->acquired)
 319                 return -EINVAL;
 320         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 321                 return -EINVAL;
 322         if (entry->bound)
 323                 return -EINVAL;
 324         page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
 325         if ((retcode = drm_bind_agp(entry->memory, page)))
 326                 return retcode;
 327         entry->bound = dev->agp->base + (page << PAGE_SHIFT);
 328         DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
 329                   dev->agp->base, entry->bound);
 330         return 0;
 331 }
 332 EXPORT_SYMBOL(drm_agp_bind);
 333
 334
 335 int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
 336                        struct drm_file *file_priv)
 337 {
 338         struct drm_agp_binding *request = data;
 339
 340         return drm_agp_bind(dev, request);
 341 }
 342
 343 /**
 344  * Free AGP memory (ioctl).
 345  *
 346  * \param inode device inode.
 347  * \param file_priv DRM file private.
 348  * \param cmd command.
 349  * \param arg pointer to a drm_agp_buffer structure.
 350  * \return zero on success or a negative number on failure.
 351  *
 352  * Verifies the AGP device is present and has been acquired and looks up the
 353  * AGP memory entry. If the memory it's currently bound, unbind it via
 354  * unbind_agp(). Frees it via free_agp() as well as the entry itself
 355  * and unlinks from the doubly linked list it's inserted in.
 356  */
 357 int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
 358 {
 359         struct drm_agp_mem *entry;
 360
 361         if (!dev->agp || !dev->agp->acquired)
 362                 return -EINVAL;
 363         if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
 364                 return -EINVAL;
 365         if (entry->bound)
 366                 drm_unbind_agp(entry->memory);
 367
 368         list_del(&entry->head);
 369
 370         drm_free_agp(entry->memory, entry->pages);
 371         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 372         return 0;
 373 }
 374 EXPORT_SYMBOL(drm_agp_free);
 375
 376
 377
 378 int drm_agp_free_ioctl(struct drm_device *dev, void *data,
 379                        struct drm_file *file_priv)
 380 {
 381         struct drm_agp_buffer *request = data;
 382
 383         return drm_agp_free(dev, request);
 384 }
 385
 386 /**
 387  * Initialize the AGP resources.
 388  *
 389  * \return pointer to a drm_agp_head structure.
 390  *
 391  * Gets the drm_agp_t structure which is made available by the agpgart module
 392  * via the inter_module_* functions. Creates and initializes a drm_agp_head
 393  * structure.
 394  */
 395 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 396 {
 397         struct drm_agp_head *head = NULL;
 398
 399         if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
 400                 return NULL;
 401         memset((void *)head, 0, sizeof(*head));
 402         head->bridge = agp_find_bridge(dev->pdev);
 403         if (!head->bridge) {
 404                 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
 405                         drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 406                         return NULL;
 407                 }
 408                 agp_copy_info(head->bridge, &head->agp_info);
 409                 agp_backend_release(head->bridge);
 410         } else {
 411                 agp_copy_info(head->bridge, &head->agp_info);
 412         }
 413         if (head->agp_info.chipset == NOT_SUPPORTED) {
 414                 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
 415                 return NULL;
 416         }
 417         INIT_LIST_HEAD(&head->memory);
 418         head->cant_use_aperture = head->agp_info.cant_use_aperture;
 419         head->page_mask = head->agp_info.page_mask;
 420         head->base = head->agp_info.aper_base;
 421         return head;
 422 }
 423
 424 /** Calls agp_allocate_memory() */
 425 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data * bridge,
 426                                      size_t pages, u32 type)
 427 {
 428         return agp_allocate_memory(bridge, pages, type);
 429 }
 430
 431 /** Calls agp_free_memory() */
 432 int drm_agp_free_memory(DRM_AGP_MEM * handle)
 433 {
 434         if (!handle)
 435                 return 0;
 436         agp_free_memory(handle);
 437         return 1;
 438 }
 439
 440 /** Calls agp_bind_memory() */
 441 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
 442 {
 443         if (!handle)
 444                 return -EINVAL;
 445         return agp_bind_memory(handle, start);
 446 }
 447
 448 /** Calls agp_unbind_memory() */
 449 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
 450 {
 451         if (!handle)
 452                 return -EINVAL;
 453         return agp_unbind_memory(handle);
 454 }
 455
 456 /**
 457  * Binds a collection of pages into AGP memory at the given offset, returning
 458  * the AGP memory structure containing them.
 459  *
 460  * No reference is held on the pages during this time -- it is up to the
 461  * caller to handle that.
 462  */
 463 DRM_AGP_MEM *
 464 drm_agp_bind_pages(struct drm_device *dev,
 465                    struct page **pages,
 466                    unsigned long num_pages,
 467                    uint32_t gtt_offset)
 468 {
 469         DRM_AGP_MEM *mem;
 470         int ret, i;
 471
 472         DRM_DEBUG("\n");
 473
 474         mem = drm_agp_allocate_memory(dev->agp->bridge, num_pages,
 475                                       AGP_USER_MEMORY);
 476         if (mem == NULL) {
 477                 DRM_ERROR("Failed to allocate memory for %ld pages\n",
 478                           num_pages);
 479                 return NULL;
 480         }
 481
 482         for (i = 0; i < num_pages; i++)
 483                 mem->memory[i] = phys_to_gart(page_to_phys(pages[i]));
 484         mem->page_count = num_pages;
 485
 486         mem->is_flushed = true;
 487         ret = drm_agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
 488         if (ret != 0) {
 489                 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
 490                 agp_free_memory(mem);
 491                 return NULL;
 492         }
 493
 494         return mem;
 495 }
 496 EXPORT_SYMBOL(drm_agp_bind_pages);
 497
 498 void drm_agp_chipset_flush(struct drm_device *dev)
 499 {
 500         agp_flush_chipset(dev->agp->bridge);
 501 }
 502 EXPORT_SYMBOL(drm_agp_chipset_flush);
 503
 504 #endif /* __OS_HAS_AGP */