2 * \file drm_agpsupport.c
3 * DRM support for AGP/GART backend
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
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:
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
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.
35 #include <linux/module.h>
40 * Get AGP information.
42 * \param inode device inode.
43 * \param filp file pointer.
45 * \param arg pointer to a (output) drm_agp_info structure.
46 * \return zero on success or a negative number on failure.
48 * Verifies the AGP device has been initialized and acquired and fills in the
49 * drm_agp_info structure with the information in drm_agp_head::agp_info.
51 int drm_agp_info(drm_device_t * dev, drm_agp_info_t *info)
55 if (!dev->agp || !dev->agp->acquired)
58 kern = &dev->agp->agp_info;
59 info->agp_version_major = kern->version.major;
60 info->agp_version_minor = kern->version.minor;
61 info->mode = kern->mode;
62 info->aperture_base = kern->aper_base;
63 info->aperture_size = kern->aper_size * 1024 * 1024;
64 info->memory_allowed = kern->max_memory << PAGE_SHIFT;
65 info->memory_used = kern->current_memory << PAGE_SHIFT;
66 info->id_vendor = kern->device->vendor;
67 info->id_device = kern->device->device;
71 EXPORT_SYMBOL(drm_agp_info);
73 int drm_agp_info_ioctl(struct inode *inode, struct file *filp,
74 unsigned int cmd, unsigned long arg)
76 drm_file_t *priv = filp->private_data;
77 drm_device_t *dev = priv->head->dev;
81 err = drm_agp_info(dev, &info);
85 if (copy_to_user((drm_agp_info_t __user *) arg, &info, sizeof(info)))
91 * Acquire the AGP device.
93 * \param dev DRM device that is to acquire AGP.
94 * \return zero on success or a negative number on failure.
96 * Verifies the AGP device hasn't been acquired before and calls
97 * \c agp_backend_acquire.
99 int drm_agp_acquire(drm_device_t * dev)
101 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
107 if (dev->agp->acquired)
109 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
110 if ((retcode = agp_backend_acquire()))
113 if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
117 dev->agp->acquired = 1;
120 EXPORT_SYMBOL(drm_agp_acquire);
123 * Acquire the AGP device (ioctl).
125 * \param inode device inode.
126 * \param filp file pointer.
127 * \param cmd command.
128 * \param arg user argument.
129 * \return zero on success or a negative number on failure.
131 * Verifies the AGP device hasn't been acquired before and calls
132 * \c agp_backend_acquire.
134 int drm_agp_acquire_ioctl(struct inode *inode, struct file *filp,
135 unsigned int cmd, unsigned long arg)
137 drm_file_t *priv = filp->private_data;
139 return drm_agp_acquire( (drm_device_t *) priv->head->dev );
143 * Release the AGP device.
145 * \param dev DRM device that is to release AGP.
146 * \return zero on success or a negative number on failure.
148 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
150 int drm_agp_release(drm_device_t *dev)
152 if (!dev->agp || !dev->agp->acquired)
154 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
155 agp_backend_release();
157 agp_backend_release(dev->agp->bridge);
159 dev->agp->acquired = 0;
163 EXPORT_SYMBOL(drm_agp_release);
165 int drm_agp_release_ioctl(struct inode *inode, struct file *filp,
166 unsigned int cmd, unsigned long arg)
168 drm_file_t *priv = filp->private_data;
169 drm_device_t *dev = priv->head->dev;
171 return drm_agp_release(dev);
175 * Enable the AGP bus.
177 * \param dev DRM device that has previously acquired AGP.
178 * \param mode Requested AGP mode.
179 * \return zero on success or a negative number on failure.
181 * Verifies the AGP device has been acquired but not enabled, and calls
184 int drm_agp_enable(drm_device_t *dev, drm_agp_mode_t mode)
186 if (!dev->agp || !dev->agp->acquired)
189 dev->agp->mode = mode.mode;
190 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
191 agp_enable(mode.mode);
193 agp_enable(dev->agp->bridge, mode.mode);
195 dev->agp->base = dev->agp->agp_info.aper_base;
196 dev->agp->enabled = 1;
199 EXPORT_SYMBOL(drm_agp_enable);
201 int drm_agp_enable_ioctl(struct inode *inode, struct file *filp,
202 unsigned int cmd, unsigned long arg)
204 drm_file_t *priv = filp->private_data;
205 drm_device_t *dev = priv->head->dev;
209 if (copy_from_user(&mode, (drm_agp_mode_t __user *) arg, sizeof(mode)))
212 return drm_agp_enable(dev, mode);
216 * Allocate AGP memory.
218 * \param inode device inode.
219 * \param filp file pointer.
220 * \param cmd command.
221 * \param arg pointer to a drm_agp_buffer structure.
222 * \return zero on success or a negative number on failure.
224 * Verifies the AGP device is present and has been acquired, allocates the
225 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
227 int drm_agp_alloc(drm_device_t *dev, drm_agp_buffer_t *request)
229 drm_agp_mem_t *entry;
234 if (!dev->agp || !dev->agp->acquired)
236 if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
239 memset(entry, 0, sizeof(*entry));
241 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
242 type = (u32) request->type;
243 if (!(memory = drm_alloc_agp(dev, pages, type))) {
244 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
248 entry->handle = (unsigned long)memory->key + 1;
249 entry->memory = memory;
251 entry->pages = pages;
253 entry->next = dev->agp->memory;
254 if (dev->agp->memory)
255 dev->agp->memory->prev = entry;
256 dev->agp->memory = entry;
258 request->handle = entry->handle;
259 request->physical = memory->physical;
263 EXPORT_SYMBOL(drm_agp_alloc);
266 int drm_agp_alloc_ioctl(struct inode *inode, struct file *filp,
267 unsigned int cmd, unsigned long arg)
269 drm_file_t *priv = filp->private_data;
270 drm_device_t *dev = priv->head->dev;
271 drm_agp_buffer_t request;
272 drm_agp_buffer_t __user *argp = (void __user *)arg;
275 if (copy_from_user(&request, argp, sizeof(request)))
278 err = drm_agp_alloc(dev, &request);
282 if (copy_to_user(argp, &request, sizeof(request))) {
283 drm_agp_mem_t *entry = dev->agp->memory;
285 dev->agp->memory = entry->next;
286 dev->agp->memory->prev = NULL;
287 drm_free_agp(entry->memory, entry->pages);
288 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
296 * Search for the AGP memory entry associated with a handle.
298 * \param dev DRM device structure.
299 * \param handle AGP memory handle.
300 * \return pointer to the drm_agp_mem structure associated with \p handle.
302 * Walks through drm_agp_head::memory until finding a matching handle.
304 static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t * dev,
305 unsigned long handle)
307 drm_agp_mem_t *entry;
309 for (entry = dev->agp->memory; entry; entry = entry->next) {
310 if (entry->handle == handle)
317 * Unbind AGP memory from the GATT (ioctl).
319 * \param inode device inode.
320 * \param filp file pointer.
321 * \param cmd command.
322 * \param arg pointer to a drm_agp_binding structure.
323 * \return zero on success or a negative number on failure.
325 * Verifies the AGP device is present and acquired, looks-up the AGP memory
326 * entry and passes it to the unbind_agp() function.
328 int drm_agp_unbind(drm_device_t *dev, drm_agp_binding_t *request)
330 drm_agp_mem_t *entry;
333 if (!dev->agp || !dev->agp->acquired)
335 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
339 ret = drm_unbind_agp(entry->memory);
344 EXPORT_SYMBOL(drm_agp_unbind);
347 int drm_agp_unbind_ioctl(struct inode *inode, struct file *filp,
348 unsigned int cmd, unsigned long arg)
350 drm_file_t *priv = filp->private_data;
351 drm_device_t *dev = priv->head->dev;
352 drm_agp_binding_t request;
355 (&request, (drm_agp_binding_t __user *) arg, sizeof(request)))
358 return drm_agp_unbind(dev, &request);
363 * Bind AGP memory into the GATT (ioctl)
365 * \param inode device inode.
366 * \param filp file pointer.
367 * \param cmd command.
368 * \param arg pointer to a drm_agp_binding structure.
369 * \return zero on success or a negative number on failure.
371 * Verifies the AGP device is present and has been acquired and that no memory
372 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
373 * it to bind_agp() function.
375 int drm_agp_bind(drm_device_t *dev, drm_agp_binding_t *request)
377 drm_agp_mem_t *entry;
381 if (!dev->agp || !dev->agp->acquired)
383 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
387 page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
388 if ((retcode = drm_bind_agp(entry->memory, page)))
390 entry->bound = dev->agp->base + (page << PAGE_SHIFT);
391 DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
392 dev->agp->base, entry->bound);
395 EXPORT_SYMBOL(drm_agp_bind);
398 int drm_agp_bind_ioctl(struct inode *inode, struct file *filp,
399 unsigned int cmd, unsigned long arg)
401 drm_file_t *priv = filp->private_data;
402 drm_device_t *dev = priv->head->dev;
403 drm_agp_binding_t request;
406 (&request, (drm_agp_binding_t __user *) arg, sizeof(request)))
409 return drm_agp_bind(dev, &request);
414 * Free AGP memory (ioctl).
416 * \param inode device inode.
417 * \param filp file pointer.
418 * \param cmd command.
419 * \param arg pointer to a drm_agp_buffer structure.
420 * \return zero on success or a negative number on failure.
422 * Verifies the AGP device is present and has been acquired and looks up the
423 * AGP memory entry. If the memory it's currently bound, unbind it via
424 * unbind_agp(). Frees it via free_agp() as well as the entry itself
425 * and unlinks from the doubly linked list it's inserted in.
427 int drm_agp_free(drm_device_t *dev, drm_agp_buffer_t *request)
429 drm_agp_mem_t *entry;
431 if (!dev->agp || !dev->agp->acquired)
433 if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
436 drm_unbind_agp(entry->memory);
439 entry->prev->next = entry->next;
441 dev->agp->memory = entry->next;
444 entry->next->prev = entry->prev;
446 drm_free_agp(entry->memory, entry->pages);
447 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
450 EXPORT_SYMBOL(drm_agp_free);
454 int drm_agp_free_ioctl(struct inode *inode, struct file *filp,
455 unsigned int cmd, unsigned long arg)
457 drm_file_t *priv = filp->private_data;
458 drm_device_t *dev = priv->head->dev;
459 drm_agp_buffer_t request;
462 (&request, (drm_agp_buffer_t __user *) arg, sizeof(request)))
465 return drm_agp_free(dev, &request);
470 * Initialize the AGP resources.
472 * \return pointer to a drm_agp_head structure.
474 * Gets the drm_agp_t structure which is made available by the agpgart module
475 * via the inter_module_* functions. Creates and initializes a drm_agp_head
478 drm_agp_head_t *drm_agp_init(drm_device_t *dev)
480 drm_agp_head_t *head = NULL;
482 if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
484 memset((void *)head, 0, sizeof(*head));
486 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
487 agp_copy_info(&head->agp_info);
489 head->bridge = agp_find_bridge(dev->pdev);
491 if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
492 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
495 agp_copy_info(head->bridge, &head->agp_info);
496 agp_backend_release(head->bridge);
498 agp_copy_info(head->bridge, &head->agp_info);
501 if (head->agp_info.chipset == NOT_SUPPORTED) {
502 drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
506 head->cant_use_aperture = head->agp_info.cant_use_aperture;
507 head->page_mask = head->agp_info.page_mask;
511 /** Calls agp_allocate_memory() */
512 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
513 DRM_AGP_MEM *drm_agp_allocate_memory(size_t pages, u32 type)
515 return agp_allocate_memory(pages, type);
518 DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge,
519 size_t pages, u32 type)
521 return agp_allocate_memory(bridge, pages, type);
525 /** Calls agp_free_memory() */
526 int drm_agp_free_memory(DRM_AGP_MEM * handle)
530 agp_free_memory(handle);
534 /** Calls agp_bind_memory() */
535 int drm_agp_bind_memory(DRM_AGP_MEM * handle, off_t start)
539 return agp_bind_memory(handle, start);
541 EXPORT_SYMBOL(drm_agp_bind_memory);
543 /** Calls agp_unbind_memory() */
544 int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
548 return agp_unbind_memory(handle);
554 * AGP ttm backend interface.
557 #ifndef AGP_USER_TYPES
558 #define AGP_USER_TYPES (1 << 16)
559 #define AGP_USER_MEMORY (AGP_USER_TYPES)
560 #define AGP_USER_CACHED_MEMORY (AGP_USER_TYPES + 1)
562 #define AGP_REQUIRED_MAJOR 0
563 #define AGP_REQUIRED_MINOR 102
565 static int drm_agp_needs_unbind_cache_adjust(drm_ttm_backend_t *backend) {
566 return ((backend->flags & DRM_BE_FLAG_BOUND_CACHED) ? 0 : 1);
570 static int drm_agp_populate(drm_ttm_backend_t *backend, unsigned long num_pages,
571 struct page **pages) {
573 drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
574 struct page **cur_page, **last_page = pages + num_pages;
577 if (drm_alloc_memctl(num_pages * sizeof(void *)))
580 DRM_DEBUG("drm_agp_populate_ttm\n");
581 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
582 mem = drm_agp_allocate_memory(num_pages, agp_priv->alloc_type);
584 mem = drm_agp_allocate_memory(agp_priv->bridge, num_pages, agp_priv->alloc_type);
587 drm_free_memctl(num_pages *sizeof(void *));
591 DRM_DEBUG("Current page count is %ld\n", (long) mem->page_count);
593 for (cur_page = pages; cur_page < last_page; ++cur_page) {
594 mem->memory[mem->page_count++] = phys_to_gart(page_to_phys(*cur_page));
600 static int drm_agp_bind_ttm(drm_ttm_backend_t *backend,
601 unsigned long offset,
604 drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
605 DRM_AGP_MEM *mem = agp_priv->mem;
608 DRM_DEBUG("drm_agp_bind_ttm\n");
609 DRM_MASK_VAL(backend->flags, DRM_BE_FLAG_BOUND_CACHED,
610 (cached) ? DRM_BE_FLAG_BOUND_CACHED : 0);
611 mem->is_flushed = TRUE;
612 mem->type = (cached) ? agp_priv->cached_type : agp_priv->uncached_type;
613 ret = drm_agp_bind_memory(mem, offset);
615 DRM_ERROR("AGP Bind memory failed\n");
620 static int drm_agp_unbind_ttm(drm_ttm_backend_t *backend) {
622 drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
624 DRM_DEBUG("drm_agp_unbind_ttm\n");
625 if (agp_priv->mem->is_bound)
626 return drm_agp_unbind_memory(agp_priv->mem);
631 static void drm_agp_clear_ttm(drm_ttm_backend_t *backend) {
633 drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
634 DRM_AGP_MEM *mem = agp_priv->mem;
636 DRM_DEBUG("drm_agp_clear_ttm\n");
638 unsigned long num_pages = mem->page_count;
639 backend->unbind(backend);
640 agp_free_memory(mem);
641 drm_free_memctl(num_pages *sizeof(void *));
644 agp_priv->mem = NULL;
647 static void drm_agp_destroy_ttm(drm_ttm_backend_t *backend) {
649 drm_agp_ttm_priv *agp_priv;
652 DRM_DEBUG("drm_agp_destroy_ttm\n");
653 agp_priv = (drm_agp_ttm_priv *) backend->private;
656 backend->clear(backend);
658 drm_ctl_free(agp_priv, sizeof(*agp_priv), DRM_MEM_MAPPINGS);
659 backend->private = NULL;
661 if (backend->flags & DRM_BE_FLAG_NEEDS_FREE) {
662 drm_ctl_free(backend, sizeof(*backend), DRM_MEM_MAPPINGS);
668 drm_ttm_backend_t *drm_agp_init_ttm(struct drm_device *dev,
669 drm_ttm_backend_t *backend)
672 drm_ttm_backend_t *agp_be;
673 drm_agp_ttm_priv *agp_priv;
674 struct agp_kern_info *info;
677 DRM_ERROR("AGP is not initialized.\n");
680 info = &dev->agp->agp_info;
682 if (info->version.major != AGP_REQUIRED_MAJOR ||
683 info->version.minor < AGP_REQUIRED_MINOR) {
684 DRM_ERROR("Wrong agpgart version %d.%d\n"
685 "\tYou need at least version %d.%d.\n",
693 agp_be = (backend != NULL) ? backend:
694 drm_ctl_calloc(1, sizeof(*agp_be), DRM_MEM_MAPPINGS);
699 agp_priv = drm_ctl_calloc(1, sizeof(*agp_priv), DRM_MEM_MAPPINGS);
702 drm_ctl_free(agp_be, sizeof(*agp_be), DRM_MEM_MAPPINGS);
707 agp_priv->mem = NULL;
708 agp_priv->alloc_type = AGP_USER_MEMORY;
709 agp_priv->cached_type = AGP_USER_CACHED_MEMORY;
710 agp_priv->uncached_type = AGP_USER_MEMORY;
711 agp_priv->bridge = dev->agp->bridge;
712 agp_priv->populated = FALSE;
713 agp_be->private = (void *) agp_priv;
714 agp_be->needs_ub_cache_adjust = drm_agp_needs_unbind_cache_adjust;
715 agp_be->populate = drm_agp_populate;
716 agp_be->clear = drm_agp_clear_ttm;
717 agp_be->bind = drm_agp_bind_ttm;
718 agp_be->unbind = drm_agp_unbind_ttm;
719 agp_be->destroy = drm_agp_destroy_ttm;
720 DRM_MASK_VAL(agp_be->flags, DRM_BE_FLAG_NEEDS_FREE,
721 (backend == NULL) ? DRM_BE_FLAG_NEEDS_FREE : 0);
722 agp_be->drm_map_type = _DRM_AGP;
725 EXPORT_SYMBOL(drm_agp_init_ttm);
727 #endif /* __OS_HAS_AGP */