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 <drm/drmP.h>
  35 #include <linux/module.h>
  36 #include <linux/slab.h>
  37 #include "drm_legacy.h"
  38
  39 #if __OS_HAS_AGP
  40
  41 #include <asm/agp.h>
  42
  43 /**
  44  * Get AGP information.
  45  *
  46  * \param inode device inode.
  47  * \param file_priv DRM file private.
  48  * \param cmd command.
  49  * \param arg pointer to a (output) drm_agp_info structure.
  50  * \return zero on success or a negative number on failure.
  51  *
  52  * Verifies the AGP device has been initialized and acquired and fills in the
  53  * drm_agp_info structure with the information in drm_agp_head::agp_info.
  54  */
  55 int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
  56 {
  57         struct agp_kern_info *kern;
  58
  59         if (!dev->agp || !dev->agp->acquired)
  60                 return -EINVAL;
  61
  62         kern = &dev->agp->agp_info;
  63         info->agp_version_major = kern->version.major;
  64         info->agp_version_minor = kern->version.minor;
  65         info->mode = kern->mode;
  66         info->aperture_base = kern->aper_base;
  67         info->aperture_size = kern->aper_size * 1024 * 1024;
  68         info->memory_allowed = kern->max_memory << PAGE_SHIFT;
  69         info->memory_used = kern->current_memory << PAGE_SHIFT;
  70         info->id_vendor = kern->device->vendor;
  71         info->id_device = kern->device->device;
  72
  73         return 0;
  74 }
  75
  76 EXPORT_SYMBOL(drm_agp_info);
  77
  78 int drm_agp_info_ioctl(struct drm_device *dev, void *data,
  79                        struct drm_file *file_priv)
  80 {
  81         struct drm_agp_info *info = data;
  82         int err;
  83
  84         err = drm_agp_info(dev, info);
  85         if (err)
  86                 return err;
  87
  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(struct drm_device * 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 file_priv DRM file private.
 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 drm_device *dev, void *data,
 127                           struct drm_file *file_priv)
 128 {
 129         return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
 130 }
 131
 132 /**
 133  * Release the AGP device.
 134  *
 135  * \param dev DRM device that is to release AGP.
 136  * \return zero on success or a negative number on failure.
 137  *
 138  * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 139  */
 140 int drm_agp_release(struct drm_device * dev)
 141 {
 142         if (!dev->agp || !dev->agp->acquired)
 143                 return -EINVAL;
 144         agp_backend_release(dev->agp->bridge);
 145         dev->agp->acquired = 0;
 146         return 0;
 147 }
 148 EXPORT_SYMBOL(drm_agp_release);
 149
 150 int drm_agp_release_ioctl(struct drm_device *dev, void *data,
 151                           struct drm_file *file_priv)
 152 {
 153         return drm_agp_release(dev);
 154 }
 155
 156 /**
 157  * Enable the AGP bus.
 158  *
 159  * \param dev DRM device that has previously acquired AGP.
 160  * \param mode Requested AGP mode.
 161  * \return zero on success or a negative number on failure.
 162  *
 163  * Verifies the AGP device has been acquired but not enabled, and calls
 164  * \c agp_enable.
 165  */
 166 int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
 167 {
 168         if (!dev->agp || !dev->agp->acquired)
 169                 return -EINVAL;
 170
 171         dev->agp->mode = mode.mode;
 172         agp_enable(dev->agp->bridge, mode.mode);
 173         dev->agp->enabled = 1;
 174         return 0;
 175 }
 176
 177 EXPORT_SYMBOL(drm_agp_enable);
 178
 179 int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
 180                          struct drm_file *file_priv)
 181 {
 182         struct drm_agp_mode *mode = data;
 183
 184         return drm_agp_enable(dev, *mode);
 185 }
 186
 187 /**
 188  * Allocate AGP memory.
 189  *
 190  * \param inode device inode.
 191  * \param file_priv file private pointer.
 192  * \param cmd command.
 193  * \param arg pointer to a drm_agp_buffer structure.
 194  * \return zero on success or a negative number on failure.
 195  *
 196  * Verifies the AGP device is present and has been acquired, allocates the
 197  * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
 198  */
 199 int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
 200 {
 201         struct drm_agp_mem *entry;
 202         struct agp_memory *memory;
 203         unsigned long pages;
 204         u32 type;
 205
 206         if (!dev->agp || !dev->agp->acquired)
 207                 return -EINVAL;
 208         if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL)))
 209                 return -ENOMEM;
 210
 211         pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
 212         type = (u32) request->type;
 213         if (!(memory = agp_allocate_memory(dev->agp->bridge, 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  * Note that final cleanup of the kmalloced structure is directly done in
 397  * drm_pci_agp_destroy.
 398  */
 399 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 400 {
 401         struct drm_agp_head *head = NULL;
 402
 403         if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
 404                 return NULL;
 405         head->bridge = agp_find_bridge(dev->pdev);
 406         if (!head->bridge) {
 407                 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
 408                         kfree(head);
 409                         return NULL;
 410                 }
 411                 agp_copy_info(head->bridge, &head->agp_info);
 412                 agp_backend_release(head->bridge);
 413         } else {
 414                 agp_copy_info(head->bridge, &head->agp_info);
 415         }
 416         if (head->agp_info.chipset == NOT_SUPPORTED) {
 417                 kfree(head);
 418                 return NULL;
 419         }
 420         INIT_LIST_HEAD(&head->memory);
 421         head->cant_use_aperture = head->agp_info.cant_use_aperture;
 422         head->page_mask = head->agp_info.page_mask;
 423         head->base = head->agp_info.aper_base;
 424         return head;
 425 }
 426
 427 /**
 428  * drm_agp_clear - Clear AGP resource list
 429  * @dev: DRM device
 430  *
 431  * Iterate over all AGP resources and remove them. But keep the AGP head
 432  * intact so it can still be used. It is safe to call this if AGP is disabled or
 433  * was already removed.
 434  *
 435  * If DRIVER_MODESET is active, nothing is done to protect the modesetting
 436  * resources from getting destroyed. Drivers are responsible of cleaning them up
 437  * during device shutdown.
 438  */
 439 void drm_agp_clear(struct drm_device *dev)
 440 {
 441         struct drm_agp_mem *entry, *tempe;
 442
 443         if (!dev->agp)
 444                 return;
 445         if (drm_core_check_feature(dev, DRIVER_MODESET))
 446                 return;
 447
 448         list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 449                 if (entry->bound)
 450                         drm_unbind_agp(entry->memory);
 451                 drm_free_agp(entry->memory, entry->pages);
 452                 kfree(entry);
 453         }
 454         INIT_LIST_HEAD(&dev->agp->memory);
 455
 456         if (dev->agp->acquired)
 457                 drm_agp_release(dev);
 458
 459         dev->agp->acquired = 0;
 460         dev->agp->enabled = 0;
 461 }
 462
 463 /**
 464  * Binds a collection of pages into AGP memory at the given offset, returning
 465  * the AGP memory structure containing them.
 466  *
 467  * No reference is held on the pages during this time -- it is up to the
 468  * caller to handle that.
 469  */
 470 struct agp_memory *
 471 drm_agp_bind_pages(struct drm_device *dev,
 472                    struct page **pages,
 473                    unsigned long num_pages,
 474                    uint32_t gtt_offset,
 475                    u32 type)
 476 {
 477         struct agp_memory *mem;
 478         int ret, i;
 479
 480         DRM_DEBUG("\n");
 481
 482         mem = agp_allocate_memory(dev->agp->bridge, num_pages,
 483                                       type);
 484         if (mem == NULL) {
 485                 DRM_ERROR("Failed to allocate memory for %ld pages\n",
 486                           num_pages);
 487                 return NULL;
 488         }
 489
 490         for (i = 0; i < num_pages; i++)
 491                 mem->pages[i] = pages[i];
 492         mem->page_count = num_pages;
 493
 494         mem->is_flushed = true;
 495         ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
 496         if (ret != 0) {
 497                 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
 498                 agp_free_memory(mem);
 499                 return NULL;
 500         }
 501
 502         return mem;
 503 }
 504 EXPORT_SYMBOL(drm_agp_bind_pages);
 505
 506 #endif /* __OS_HAS_AGP */