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