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 #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         struct agp_kern_info *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 agp_allocate_memory() 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         struct agp_memory *memory;
 201         unsigned long pages;
 202         u32 type;
 203
 204         if (!dev->agp || !dev->agp->acquired)
 205                 return -EINVAL;
 206         if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL)))
 207                 return -ENOMEM;
 208
 209         pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
 210         type = (u32) request->type;
 211         if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
 212                 kfree(entry);
 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         kfree(entry);
 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  * Note that final cleanup of the kmalloced structure is directly done in
 395  * drm_pci_agp_destroy.
 396  */
 397 struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 398 {
 399         struct drm_agp_head *head = NULL;
 400
 401         if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
 402                 return NULL;
 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 /**
 426  * drm_legacy_agp_clear - Clear AGP resource list
 427  * @dev: DRM device
 428  *
 429  * Iterate over all AGP resources and remove them. But keep the AGP head
 430  * intact so it can still be used. It is safe to call this if AGP is disabled or
 431  * was already removed.
 432  *
 433  * If DRIVER_MODESET is active, nothing is done to protect the modesetting
 434  * resources from getting destroyed. Drivers are responsible of cleaning them up
 435  * during device shutdown.
 436  */
 437 void drm_legacy_agp_clear(struct drm_device *dev)
 438 {
 439         struct drm_agp_mem *entry, *tempe;
 440
 441         if (!dev->agp)
 442                 return;
 443         if (drm_core_check_feature(dev, DRIVER_MODESET))
 444                 return;
 445
 446         list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 447                 if (entry->bound)
 448                         drm_unbind_agp(entry->memory);
 449                 drm_free_agp(entry->memory, entry->pages);
 450                 kfree(entry);
 451         }
 452         INIT_LIST_HEAD(&dev->agp->memory);
 453
 454         if (dev->agp->acquired)
 455                 drm_agp_release(dev);
 456
 457         dev->agp->acquired = 0;
 458         dev->agp->enabled = 0;
 459 }
 460
 461 /**
 462  * Binds a collection of pages into AGP memory at the given offset, returning
 463  * the AGP memory structure containing them.
 464  *
 465  * No reference is held on the pages during this time -- it is up to the
 466  * caller to handle that.
 467  */
 468 struct agp_memory *
 469 drm_agp_bind_pages(struct drm_device *dev,
 470                    struct page **pages,
 471                    unsigned long num_pages,
 472                    uint32_t gtt_offset,
 473                    u32 type)
 474 {
 475         struct agp_memory *mem;
 476         int ret, i;
 477
 478         DRM_DEBUG("\n");
 479
 480         mem = agp_allocate_memory(dev->agp->bridge, num_pages,
 481                                       type);
 482         if (mem == NULL) {
 483                 DRM_ERROR("Failed to allocate memory for %ld pages\n",
 484                           num_pages);
 485                 return NULL;
 486         }
 487
 488         for (i = 0; i < num_pages; i++)
 489                 mem->pages[i] = pages[i];
 490         mem->page_count = num_pages;
 491
 492         mem->is_flushed = true;
 493         ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
 494         if (ret != 0) {
 495                 DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
 496                 agp_free_memory(mem);
 497                 return NULL;
 498         }
 499
 500         return mem;
 501 }
 502 EXPORT_SYMBOL(drm_agp_bind_pages);