/** * \file drm_agpsupport.c * DRM support for AGP/GART backend * * \author Rickard E. (Rik) Faith * \author Gareth Hughes */ /* * 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 #include #include "drm_legacy.h" #include #include /** * 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_info *kern; if (!dev->agp || !dev->agp->acquired) return -EINVAL; kern = &dev->agp->agp_info; agp_get_info(dev->agp->agpdev, kern); info->agp_version_major = 1; info->agp_version_minor = 0; info->mode = kern->ai_mode; info->aperture_base = kern->ai_aperture_base; info->aperture_size = kern->ai_aperture_size; info->memory_allowed = kern->ai_memory_allowed; info->memory_used = kern->ai_memory_used; info->id_vendor = kern->ai_devid & 0xffff; info->id_device = kern->ai_devid >> 16; 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; int err; err = drm_agp_info(dev, &info); if (err) return err; *(struct drm_agp_info *) data = info; 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) { int retcode; if (!dev->agp || dev->agp->acquired) return -EINVAL; retcode = -agp_acquire(dev->agp->agpdev); if (retcode) return retcode; 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(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_release(dev->agp->agpdev); 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->agpdev, 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; mode = *(struct drm_agp_mode *) data; return drm_agp_enable(dev, mode); } static void *drm_agp_allocate_memory(size_t pages, u32 type) { device_t agpdev; agpdev = agp_find_device(); if (!agpdev) return NULL; return agp_alloc_memory(agpdev, type, pages << AGP_PAGE_SHIFT); } /** * 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; void *handle; unsigned long pages; u_int32_t type; struct agp_memory_info info; if (!dev->agp || !dev->agp->acquired) return -EINVAL; entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_NULLOK | M_ZERO); if (entry == NULL) return -ENOMEM; pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; type = (u_int32_t) request->type; handle = drm_agp_allocate_memory(pages, type); if (handle == NULL) { kfree(entry); return -ENOMEM; } entry->handle = handle; entry->bound = 0; entry->pages = pages; entry->prev = NULL; entry->next = dev->agp->memory; if (dev->agp->memory) dev->agp->memory->prev = entry; dev->agp->memory = entry; agp_memory_info(dev->agp->agpdev, entry->handle, &info); request->handle = (unsigned long) entry->handle; request->physical = info.ami_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; int retcode; request = *(struct drm_agp_buffer *) data; retcode = drm_agp_alloc(dev, &request); *(struct drm_agp_buffer *) data = request; return retcode; } /** * 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, void *handle) { struct drm_agp_mem *entry; for (entry = dev->agp->memory; entry; entry = entry->next) { if (entry->handle == handle) return entry; } return NULL; } static int drm_agp_unbind_memory(void *handle) { device_t agpdev; agpdev = agp_find_device(); if (!agpdev || !handle) return -EINVAL; return -agp_unbind_memory(agpdev, handle); } /** * 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; entry = drm_agp_lookup_entry(dev, (void *)request->handle); if (entry == NULL || !entry->bound) return -EINVAL; ret = drm_agp_unbind_memory(entry->handle); 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; request = *(struct drm_agp_binding *) data; return drm_agp_unbind(dev, &request); } static int drm_agp_bind_memory(void *handle, off_t start) { device_t agpdev; agpdev = agp_find_device(); if (!agpdev || !handle) return -EINVAL; return -agp_bind_memory(agpdev, handle, start * PAGE_SIZE); } /** * 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; DRM_DEBUG("agp_bind, page_size=%x\n", (int)PAGE_SIZE); entry = drm_agp_lookup_entry(dev, (void *)request->handle); if (entry == NULL || entry->bound) return -EINVAL; page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE; retcode = drm_agp_bind_memory(entry->handle, page); if (retcode == 0) entry->bound = dev->agp->base + (page << PAGE_SHIFT); return retcode; } 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; request = *(struct drm_agp_binding *) data; return drm_agp_bind(dev, &request); } static int drm_agp_free_memory(void *handle) { device_t agpdev; agpdev = agp_find_device(); if (!agpdev || !handle) return 0; agp_free_memory(agpdev, handle); return 1; } /** * 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; entry = drm_agp_lookup_entry(dev, (void*)request->handle); if (entry == NULL) return -EINVAL; if (entry->prev) entry->prev->next = entry->next; else dev->agp->memory = entry->next; if (entry->next) entry->next->prev = entry->prev; if (entry->bound) drm_agp_unbind_memory(entry->handle); drm_agp_free_memory(entry->handle); 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; request = *(struct drm_agp_buffer *) 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) { device_t agpdev; struct drm_agp_head *head = NULL; int agp_available = 1; agpdev = agp_find_device(); if (!agpdev) agp_available = 0; DRM_DEBUG("agp_available = %d\n", agp_available); if (agp_available) { head = kmalloc(sizeof(*head), M_DRM, M_WAITOK | M_NULLOK | M_ZERO); if (head == NULL) return NULL; head->agpdev = agpdev; agp_get_info(agpdev, &head->agp_info); head->base = head->agp_info.ai_aperture_base; head->memory = NULL; DRM_INFO("AGP at 0x%08lx %dMB\n", (long)head->agp_info.ai_aperture_base, (int)(head->agp_info.ai_aperture_size >> 20)); } return head; } /** * drm_legacy_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_legacy_agp_clear(struct drm_device *dev) { struct drm_agp_mem *entry, *nexte; if (!dev->agp) return; if (drm_core_check_feature(dev, DRIVER_MODESET)) return; /* Remove AGP resources, but leave dev->agp intact until * drm_unload is called. */ for (entry = dev->agp->memory; entry; entry = nexte) { nexte = entry->next; if (entry->bound) drm_agp_unbind_memory(entry->handle); drm_agp_free_memory(entry->handle); kfree(entry); } dev->agp->memory = NULL; if (dev->agp->acquired) drm_agp_release(dev); dev->agp->acquired = 0; dev->agp->enabled = 0; }