linux/drivers/gpu/drm/drm_agpsupport.c
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   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 <linux/module.h>
  35#include <linux/pci.h>
  36#include <linux/slab.h>
  37
  38#include <asm/agp.h>
  39
  40#include <drm/drm_agpsupport.h>
  41#include <drm/drm_device.h>
  42#include <drm/drm_drv.h>
  43#include <drm/drm_file.h>
  44#include <drm/drm_print.h>
  45
  46#include "drm_legacy.h"
  47
  48/**
  49 * Get AGP information.
  50 *
  51 * \param inode device inode.
  52 * \param file_priv DRM file private.
  53 * \param cmd command.
  54 * \param arg pointer to a (output) drm_agp_info structure.
  55 * \return zero on success or a negative number on failure.
  56 *
  57 * Verifies the AGP device has been initialized and acquired and fills in the
  58 * drm_agp_info structure with the information in drm_agp_head::agp_info.
  59 */
  60int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
  61{
  62        struct agp_kern_info *kern;
  63
  64        if (!dev->agp || !dev->agp->acquired)
  65                return -EINVAL;
  66
  67        kern = &dev->agp->agp_info;
  68        info->agp_version_major = kern->version.major;
  69        info->agp_version_minor = kern->version.minor;
  70        info->mode = kern->mode;
  71        info->aperture_base = kern->aper_base;
  72        info->aperture_size = kern->aper_size * 1024 * 1024;
  73        info->memory_allowed = kern->max_memory << PAGE_SHIFT;
  74        info->memory_used = kern->current_memory << PAGE_SHIFT;
  75        info->id_vendor = kern->device->vendor;
  76        info->id_device = kern->device->device;
  77
  78        return 0;
  79}
  80EXPORT_SYMBOL(drm_agp_info);
  81
  82int drm_agp_info_ioctl(struct drm_device *dev, void *data,
  83                       struct drm_file *file_priv)
  84{
  85        struct drm_agp_info *info = data;
  86        int err;
  87
  88        err = drm_agp_info(dev, info);
  89        if (err)
  90                return err;
  91
  92        return 0;
  93}
  94
  95/**
  96 * Acquire the AGP device.
  97 *
  98 * \param dev DRM device that is to acquire AGP.
  99 * \return zero on success or a negative number on failure.
 100 *
 101 * Verifies the AGP device hasn't been acquired before and calls
 102 * \c agp_backend_acquire.
 103 */
 104int drm_agp_acquire(struct drm_device *dev)
 105{
 106        if (!dev->agp)
 107                return -ENODEV;
 108        if (dev->agp->acquired)
 109                return -EBUSY;
 110        dev->agp->bridge = agp_backend_acquire(dev->pdev);
 111        if (!dev->agp->bridge)
 112                return -ENODEV;
 113        dev->agp->acquired = 1;
 114        return 0;
 115}
 116EXPORT_SYMBOL(drm_agp_acquire);
 117
 118/**
 119 * Acquire the AGP device (ioctl).
 120 *
 121 * \param inode device inode.
 122 * \param file_priv DRM file private.
 123 * \param cmd command.
 124 * \param arg user argument.
 125 * \return zero on success or a negative number on failure.
 126 *
 127 * Verifies the AGP device hasn't been acquired before and calls
 128 * \c agp_backend_acquire.
 129 */
 130int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
 131                          struct drm_file *file_priv)
 132{
 133        return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
 134}
 135
 136/**
 137 * Release the AGP device.
 138 *
 139 * \param dev DRM device that is to release AGP.
 140 * \return zero on success or a negative number on failure.
 141 *
 142 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
 143 */
 144int drm_agp_release(struct drm_device *dev)
 145{
 146        if (!dev->agp || !dev->agp->acquired)
 147                return -EINVAL;
 148        agp_backend_release(dev->agp->bridge);
 149        dev->agp->acquired = 0;
 150        return 0;
 151}
 152EXPORT_SYMBOL(drm_agp_release);
 153
 154int drm_agp_release_ioctl(struct drm_device *dev, void *data,
 155                          struct drm_file *file_priv)
 156{
 157        return drm_agp_release(dev);
 158}
 159
 160/**
 161 * Enable the AGP bus.
 162 *
 163 * \param dev DRM device that has previously acquired AGP.
 164 * \param mode Requested AGP mode.
 165 * \return zero on success or a negative number on failure.
 166 *
 167 * Verifies the AGP device has been acquired but not enabled, and calls
 168 * \c agp_enable.
 169 */
 170int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode)
 171{
 172        if (!dev->agp || !dev->agp->acquired)
 173                return -EINVAL;
 174
 175        dev->agp->mode = mode.mode;
 176        agp_enable(dev->agp->bridge, mode.mode);
 177        dev->agp->enabled = 1;
 178        return 0;
 179}
 180EXPORT_SYMBOL(drm_agp_enable);
 181
 182int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
 183                         struct drm_file *file_priv)
 184{
 185        struct drm_agp_mode *mode = data;
 186
 187        return drm_agp_enable(dev, *mode);
 188}
 189
 190/**
 191 * Allocate AGP memory.
 192 *
 193 * \param inode device inode.
 194 * \param file_priv file private pointer.
 195 * \param cmd command.
 196 * \param arg pointer to a drm_agp_buffer structure.
 197 * \return zero on success or a negative number on failure.
 198 *
 199 * Verifies the AGP device is present and has been acquired, allocates the
 200 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
 201 */
 202int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
 203{
 204        struct drm_agp_mem *entry;
 205        struct agp_memory *memory;
 206        unsigned long pages;
 207        u32 type;
 208
 209        if (!dev->agp || !dev->agp->acquired)
 210                return -EINVAL;
 211        entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 212        if (!entry)
 213                return -ENOMEM;
 214
 215        pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
 216        type = (u32) request->type;
 217        memory = agp_allocate_memory(dev->agp->bridge, pages, type);
 218        if (!memory) {
 219                kfree(entry);
 220                return -ENOMEM;
 221        }
 222
 223        entry->handle = (unsigned long)memory->key + 1;
 224        entry->memory = memory;
 225        entry->bound = 0;
 226        entry->pages = pages;
 227        list_add(&entry->head, &dev->agp->memory);
 228
 229        request->handle = entry->handle;
 230        request->physical = memory->physical;
 231
 232        return 0;
 233}
 234EXPORT_SYMBOL(drm_agp_alloc);
 235
 236
 237int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
 238                        struct drm_file *file_priv)
 239{
 240        struct drm_agp_buffer *request = data;
 241
 242        return drm_agp_alloc(dev, request);
 243}
 244
 245/**
 246 * Search for the AGP memory entry associated with a handle.
 247 *
 248 * \param dev DRM device structure.
 249 * \param handle AGP memory handle.
 250 * \return pointer to the drm_agp_mem structure associated with \p handle.
 251 *
 252 * Walks through drm_agp_head::memory until finding a matching handle.
 253 */
 254static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device *dev,
 255                                                unsigned long handle)
 256{
 257        struct drm_agp_mem *entry;
 258
 259        list_for_each_entry(entry, &dev->agp->memory, head) {
 260                if (entry->handle == handle)
 261                        return entry;
 262        }
 263        return NULL;
 264}
 265
 266/**
 267 * Unbind AGP memory from the GATT (ioctl).
 268 *
 269 * \param inode device inode.
 270 * \param file_priv DRM file private.
 271 * \param cmd command.
 272 * \param arg pointer to a drm_agp_binding structure.
 273 * \return zero on success or a negative number on failure.
 274 *
 275 * Verifies the AGP device is present and acquired, looks-up the AGP memory
 276 * entry and passes it to the unbind_agp() function.
 277 */
 278int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
 279{
 280        struct drm_agp_mem *entry;
 281        int ret;
 282
 283        if (!dev->agp || !dev->agp->acquired)
 284                return -EINVAL;
 285        entry = drm_agp_lookup_entry(dev, request->handle);
 286        if (!entry || !entry->bound)
 287                return -EINVAL;
 288        ret = drm_unbind_agp(entry->memory);
 289        if (ret == 0)
 290                entry->bound = 0;
 291        return ret;
 292}
 293EXPORT_SYMBOL(drm_agp_unbind);
 294
 295
 296int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
 297                         struct drm_file *file_priv)
 298{
 299        struct drm_agp_binding *request = data;
 300
 301        return drm_agp_unbind(dev, request);
 302}
 303
 304/**
 305 * Bind AGP memory into the GATT (ioctl)
 306 *
 307 * \param inode device inode.
 308 * \param file_priv DRM file private.
 309 * \param cmd command.
 310 * \param arg pointer to a drm_agp_binding structure.
 311 * \return zero on success or a negative number on failure.
 312 *
 313 * Verifies the AGP device is present and has been acquired and that no memory
 314 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 315 * it to bind_agp() function.
 316 */
 317int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
 318{
 319        struct drm_agp_mem *entry;
 320        int retcode;
 321        int page;
 322
 323        if (!dev->agp || !dev->agp->acquired)
 324                return -EINVAL;
 325        entry = drm_agp_lookup_entry(dev, request->handle);
 326        if (!entry || entry->bound)
 327                return -EINVAL;
 328        page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
 329        retcode = drm_bind_agp(entry->memory, page);
 330        if (retcode)
 331                return retcode;
 332        entry->bound = dev->agp->base + (page << PAGE_SHIFT);
 333        DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
 334                  dev->agp->base, entry->bound);
 335        return 0;
 336}
 337EXPORT_SYMBOL(drm_agp_bind);
 338
 339
 340int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
 341                       struct drm_file *file_priv)
 342{
 343        struct drm_agp_binding *request = data;
 344
 345        return drm_agp_bind(dev, request);
 346}
 347
 348/**
 349 * Free AGP memory (ioctl).
 350 *
 351 * \param inode device inode.
 352 * \param file_priv DRM file private.
 353 * \param cmd command.
 354 * \param arg pointer to a drm_agp_buffer structure.
 355 * \return zero on success or a negative number on failure.
 356 *
 357 * Verifies the AGP device is present and has been acquired and looks up the
 358 * AGP memory entry. If the memory is currently bound, unbind it via
 359 * unbind_agp(). Frees it via free_agp() as well as the entry itself
 360 * and unlinks from the doubly linked list it's inserted in.
 361 */
 362int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
 363{
 364        struct drm_agp_mem *entry;
 365
 366        if (!dev->agp || !dev->agp->acquired)
 367                return -EINVAL;
 368        entry = drm_agp_lookup_entry(dev, request->handle);
 369        if (!entry)
 370                return -EINVAL;
 371        if (entry->bound)
 372                drm_unbind_agp(entry->memory);
 373
 374        list_del(&entry->head);
 375
 376        drm_free_agp(entry->memory, entry->pages);
 377        kfree(entry);
 378        return 0;
 379}
 380EXPORT_SYMBOL(drm_agp_free);
 381
 382
 383int drm_agp_free_ioctl(struct drm_device *dev, void *data,
 384                       struct drm_file *file_priv)
 385{
 386        struct drm_agp_buffer *request = data;
 387
 388        return drm_agp_free(dev, request);
 389}
 390
 391/**
 392 * Initialize the AGP resources.
 393 *
 394 * \return pointer to a drm_agp_head structure.
 395 *
 396 * Gets the drm_agp_t structure which is made available by the agpgart module
 397 * via the inter_module_* functions. Creates and initializes a drm_agp_head
 398 * structure.
 399 *
 400 * Note that final cleanup of the kmalloced structure is directly done in
 401 * drm_pci_agp_destroy.
 402 */
 403struct drm_agp_head *drm_agp_init(struct drm_device *dev)
 404{
 405        struct drm_agp_head *head = NULL;
 406
 407        head = kzalloc(sizeof(*head), GFP_KERNEL);
 408        if (!head)
 409                return NULL;
 410        head->bridge = agp_find_bridge(dev->pdev);
 411        if (!head->bridge) {
 412                head->bridge = agp_backend_acquire(dev->pdev);
 413                if (!head->bridge) {
 414                        kfree(head);
 415                        return NULL;
 416                }
 417                agp_copy_info(head->bridge, &head->agp_info);
 418                agp_backend_release(head->bridge);
 419        } else {
 420                agp_copy_info(head->bridge, &head->agp_info);
 421        }
 422        if (head->agp_info.chipset == NOT_SUPPORTED) {
 423                kfree(head);
 424                return NULL;
 425        }
 426        INIT_LIST_HEAD(&head->memory);
 427        head->cant_use_aperture = head->agp_info.cant_use_aperture;
 428        head->page_mask = head->agp_info.page_mask;
 429        head->base = head->agp_info.aper_base;
 430        return head;
 431}
 432/* Only exported for i810.ko */
 433EXPORT_SYMBOL(drm_agp_init);
 434
 435/**
 436 * drm_legacy_agp_clear - Clear AGP resource list
 437 * @dev: DRM device
 438 *
 439 * Iterate over all AGP resources and remove them. But keep the AGP head
 440 * intact so it can still be used. It is safe to call this if AGP is disabled or
 441 * was already removed.
 442 *
 443 * Cleanup is only done for drivers who have DRIVER_LEGACY set.
 444 */
 445void drm_legacy_agp_clear(struct drm_device *dev)
 446{
 447        struct drm_agp_mem *entry, *tempe;
 448
 449        if (!dev->agp)
 450                return;
 451        if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 452                return;
 453
 454        list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 455                if (entry->bound)
 456                        drm_unbind_agp(entry->memory);
 457                drm_free_agp(entry->memory, entry->pages);
 458                kfree(entry);
 459        }
 460        INIT_LIST_HEAD(&dev->agp->memory);
 461
 462        if (dev->agp->acquired)
 463                drm_agp_release(dev);
 464
 465        dev->agp->acquired = 0;
 466        dev->agp->enabled = 0;
 467}
 468