/** * \file drm_agpsupport.c * DRM support for AGP/GART backend * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ /* * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include <drm/drmP.h> #include <linux/module.h> #include <linux/slab.h> #include "drm_legacy.h" #if __OS_HAS_AGP #include <asm/agp.h> /** * Get AGP information. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a (output) drm_agp_info structure. * \return zero on success or a negative number on failure. * * Verifies the AGP device has been initialized and acquired and fills in the * drm_agp_info structure with the information in drm_agp_head::agp_info. */ int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info) { struct agp_kern_info *kern; if (!dev->agp || !dev->agp->acquired) return -EINVAL; kern = &dev->agp->agp_info; info->agp_version_major = kern->version.major; info->agp_version_minor = kern->version.minor; info->mode = kern->mode; info->aperture_base = kern->aper_base; info->aperture_size = kern->aper_size * 1024 * 1024; info->memory_allowed = kern->max_memory << PAGE_SHIFT; info->memory_used = kern->current_memory << PAGE_SHIFT; info->id_vendor = kern->device->vendor; info->id_device = kern->device->device; return 0; } EXPORT_SYMBOL(drm_agp_info); int drm_agp_info_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_agp_info *info = data; int err; err = drm_agp_info(dev, info); if (err) return err; return 0; } /** * Acquire the AGP device. * * \param dev DRM device that is to acquire AGP. * \return zero on success or a negative number on failure. * * Verifies the AGP device hasn't been acquired before and calls * \c agp_backend_acquire. */ int drm_agp_acquire(struct drm_device * dev) { if (!dev->agp) return -ENODEV; if (dev->agp->acquired) return -EBUSY; if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev))) return -ENODEV; dev->agp->acquired = 1; return 0; } EXPORT_SYMBOL(drm_agp_acquire); /** * Acquire the AGP device (ioctl). * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg user argument. * \return zero on success or a negative number on failure. * * Verifies the AGP device hasn't been acquired before and calls * \c agp_backend_acquire. */ int drm_agp_acquire_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { return drm_agp_acquire((struct drm_device *) file_priv->minor->dev); } /** * Release the AGP device. * * \param dev DRM device that is to release AGP. * \return zero on success or a negative number on failure. * * Verifies the AGP device has been acquired and calls \c agp_backend_release. */ int drm_agp_release(struct drm_device * dev) { if (!dev->agp || !dev->agp->acquired) return -EINVAL; agp_backend_release(dev->agp->bridge); dev->agp->acquired = 0; return 0; } EXPORT_SYMBOL(drm_agp_release); int drm_agp_release_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { return drm_agp_release(dev); } /** * Enable the AGP bus. * * \param dev DRM device that has previously acquired AGP. * \param mode Requested AGP mode. * \return zero on success or a negative number on failure. * * Verifies the AGP device has been acquired but not enabled, and calls * \c agp_enable. */ int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode) { if (!dev->agp || !dev->agp->acquired) return -EINVAL; dev->agp->mode = mode.mode; agp_enable(dev->agp->bridge, mode.mode); dev->agp->enabled = 1; return 0; } EXPORT_SYMBOL(drm_agp_enable); int drm_agp_enable_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_agp_mode *mode = data; return drm_agp_enable(dev, *mode); } /** * Allocate AGP memory. * * \param inode device inode. * \param file_priv file private pointer. * \param cmd command. * \param arg pointer to a drm_agp_buffer structure. * \return zero on success or a negative number on failure. * * Verifies the AGP device is present and has been acquired, allocates the * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it. */ int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request) { struct drm_agp_mem *entry; struct agp_memory *memory; unsigned long pages; u32 type; if (!dev->agp || !dev->agp->acquired) return -EINVAL; if (!(entry = kzalloc(sizeof(*entry), GFP_KERNEL))) return -ENOMEM; pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; type = (u32) request->type; if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) { kfree(entry); return -ENOMEM; } entry->handle = (unsigned long)memory->key + 1; entry->memory = memory; entry->bound = 0; entry->pages = pages; list_add(&entry->head, &dev->agp->memory); request->handle = entry->handle; request->physical = memory->physical; return 0; } EXPORT_SYMBOL(drm_agp_alloc); int drm_agp_alloc_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_agp_buffer *request = data; return drm_agp_alloc(dev, request); } /** * Search for the AGP memory entry associated with a handle. * * \param dev DRM device structure. * \param handle AGP memory handle. * \return pointer to the drm_agp_mem structure associated with \p handle. * * Walks through drm_agp_head::memory until finding a matching handle. */ static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev, unsigned long handle) { struct drm_agp_mem *entry; list_for_each_entry(entry, &dev->agp->memory, head) { if (entry->handle == handle) return entry; } return NULL; } /** * Unbind AGP memory from the GATT (ioctl). * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_agp_binding structure. * \return zero on success or a negative number on failure. * * Verifies the AGP device is present and acquired, looks-up the AGP memory * entry and passes it to the unbind_agp() function. */ int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request) { struct drm_agp_mem *entry; int ret; if (!dev->agp || !dev->agp->acquired) return -EINVAL; if (!(entry = drm_agp_lookup_entry(dev, request->handle))) return -EINVAL; if (!entry->bound) return -EINVAL; ret = drm_unbind_agp(entry->memory); if (ret == 0) entry->bound = 0; return ret; } EXPORT_SYMBOL(drm_agp_unbind); int drm_agp_unbind_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_agp_binding *request = data; return drm_agp_unbind(dev, request); } /** * Bind AGP memory into the GATT (ioctl) * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_agp_binding structure. * \return zero on success or a negative number on failure. * * Verifies the AGP device is present and has been acquired and that no memory * is currently bound into the GATT. Looks-up the AGP memory entry and passes * it to bind_agp() function. */ int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request) { struct drm_agp_mem *entry; int retcode; int page; if (!dev->agp || !dev->agp->acquired) return -EINVAL; if (!(entry = drm_agp_lookup_entry(dev, request->handle))) return -EINVAL; if (entry->bound) return -EINVAL; page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE; if ((retcode = drm_bind_agp(entry->memory, page))) return retcode; entry->bound = dev->agp->base + (page << PAGE_SHIFT); DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n", dev->agp->base, entry->bound); return 0; } EXPORT_SYMBOL(drm_agp_bind); int drm_agp_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_agp_binding *request = data; return drm_agp_bind(dev, request); } /** * Free AGP memory (ioctl). * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_agp_buffer structure. * \return zero on success or a negative number on failure. * * Verifies the AGP device is present and has been acquired and looks up the * AGP memory entry. If the memory it's currently bound, unbind it via * unbind_agp(). Frees it via free_agp() as well as the entry itself * and unlinks from the doubly linked list it's inserted in. */ int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request) { struct drm_agp_mem *entry; if (!dev->agp || !dev->agp->acquired) return -EINVAL; if (!(entry = drm_agp_lookup_entry(dev, request->handle))) return -EINVAL; if (entry->bound) drm_unbind_agp(entry->memory); list_del(&entry->head); drm_free_agp(entry->memory, entry->pages); kfree(entry); return 0; } EXPORT_SYMBOL(drm_agp_free); int drm_agp_free_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_agp_buffer *request = data; return drm_agp_free(dev, request); } /** * Initialize the AGP resources. * * \return pointer to a drm_agp_head structure. * * Gets the drm_agp_t structure which is made available by the agpgart module * via the inter_module_* functions. Creates and initializes a drm_agp_head * structure. * * Note that final cleanup of the kmalloced structure is directly done in * drm_pci_agp_destroy. */ struct drm_agp_head *drm_agp_init(struct drm_device *dev) { struct drm_agp_head *head = NULL; if (!(head = kzalloc(sizeof(*head), GFP_KERNEL))) return NULL; head->bridge = agp_find_bridge(dev->pdev); if (!head->bridge) { if (!(head->bridge = agp_backend_acquire(dev->pdev))) { kfree(head); return NULL; } agp_copy_info(head->bridge, &head->agp_info); agp_backend_release(head->bridge); } else { agp_copy_info(head->bridge, &head->agp_info); } if (head->agp_info.chipset == NOT_SUPPORTED) { kfree(head); return NULL; } INIT_LIST_HEAD(&head->memory); head->cant_use_aperture = head->agp_info.cant_use_aperture; head->page_mask = head->agp_info.page_mask; head->base = head->agp_info.aper_base; return head; } /** * drm_agp_clear - Clear AGP resource list * @dev: DRM device * * Iterate over all AGP resources and remove them. But keep the AGP head * intact so it can still be used. It is safe to call this if AGP is disabled or * was already removed. * * If DRIVER_MODESET is active, nothing is done to protect the modesetting * resources from getting destroyed. Drivers are responsible of cleaning them up * during device shutdown. */ void drm_agp_clear(struct drm_device *dev) { struct drm_agp_mem *entry, *tempe; if (!dev->agp) return; if (drm_core_check_feature(dev, DRIVER_MODESET)) return; list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { if (entry->bound) drm_unbind_agp(entry->memory); drm_free_agp(entry->memory, entry->pages); kfree(entry); } INIT_LIST_HEAD(&dev->agp->memory); if (dev->agp->acquired) drm_agp_release(dev); dev->agp->acquired = 0; dev->agp->enabled = 0; } /** * Binds a collection of pages into AGP memory at the given offset, returning * the AGP memory structure containing them. * * No reference is held on the pages during this time -- it is up to the * caller to handle that. */ struct agp_memory * drm_agp_bind_pages(struct drm_device *dev, struct page **pages, unsigned long num_pages, uint32_t gtt_offset, u32 type) { struct agp_memory *mem; int ret, i; DRM_DEBUG("\n"); mem = agp_allocate_memory(dev->agp->bridge, num_pages, type); if (mem == NULL) { DRM_ERROR("Failed to allocate memory for %ld pages\n", num_pages); return NULL; } for (i = 0; i < num_pages; i++) mem->pages[i] = pages[i]; mem->page_count = num_pages; mem->is_flushed = true; ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE); if (ret != 0) { DRM_ERROR("Failed to bind AGP memory: %d\n", ret); agp_free_memory(mem); return NULL; } return mem; } EXPORT_SYMBOL(drm_agp_bind_pages); #endif /* __OS_HAS_AGP */