diff options
Diffstat (limited to 'drivers/char/drm/drm_agpsupport.c')
| -rw-r--r-- | drivers/char/drm/drm_agpsupport.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_agpsupport.c b/drivers/char/drm/drm_agpsupport.c new file mode 100644 index 00000000000..8d94c0b5fa4 --- /dev/null +++ b/drivers/char/drm/drm_agpsupport.c @@ -0,0 +1,448 @@ +/** + * \file drm_agpsupport.h + * 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 "drmP.h" +#include <linux/module.h> + +#if __OS_HAS_AGP + +/** + * AGP information ioctl. + * + * \param inode device inode. + * \param filp file pointer. + * \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 inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + DRM_AGP_KERN *kern; + drm_agp_info_t info; + + 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; + + if (copy_to_user((drm_agp_info_t __user *)arg, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +/** + * Acquire the AGP device (ioctl). + * + * \param inode device inode. + * \param filp file pointer. + * \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 + * agp_acquire(). + */ +int drm_agp_acquire(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->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; +} + +/** + * Release the AGP device (ioctl). + * + * \param inode device inode. + * \param filp file pointer. + * \param cmd command. + * \param arg user argument. + * \return zero on success or a negative number on failure. + * + * Verifies the AGP device has been acquired and calls agp_backend_release(). + */ +int drm_agp_release(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + + if (!dev->agp || !dev->agp->acquired) + return -EINVAL; + agp_backend_release(dev->agp->bridge); + dev->agp->acquired = 0; + return 0; + +} + +/** + * Release the AGP device. + * + * Calls agp_backend_release(). + */ +void drm_agp_do_release(drm_device_t *dev) +{ + agp_backend_release(dev->agp->bridge); +} + +/** + * Enable the AGP bus. + * + * \param inode device inode. + * \param filp file pointer. + * \param cmd command. + * \param arg pointer to a drm_agp_mode structure. + * \return zero on success or a negative number on failure. + * + * Verifies the AGP device has been acquired but not enabled, and calls + * agp_enable(). + */ +int drm_agp_enable(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_agp_mode_t mode; + + if (!dev->agp || !dev->agp->acquired) + return -EINVAL; + + if (copy_from_user(&mode, (drm_agp_mode_t __user *)arg, sizeof(mode))) + return -EFAULT; + + dev->agp->mode = mode.mode; + agp_enable(dev->agp->bridge, mode.mode); + dev->agp->base = dev->agp->agp_info.aper_base; + dev->agp->enabled = 1; + return 0; +} + +/** + * Allocate AGP memory. + * + * \param inode device inode. + * \param filp file 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 alloc_agp() and creates a drm_agp_mem entry for it. + */ +int drm_agp_alloc(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_agp_buffer_t request; + drm_agp_mem_t *entry; + DRM_AGP_MEM *memory; + unsigned long pages; + u32 type; + drm_agp_buffer_t __user *argp = (void __user *)arg; + + if (!dev->agp || !dev->agp->acquired) + return -EINVAL; + if (copy_from_user(&request, argp, sizeof(request))) + return -EFAULT; + if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS))) + return -ENOMEM; + + memset(entry, 0, sizeof(*entry)); + + pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE; + type = (u32) request.type; + + if (!(memory = drm_alloc_agp(dev->agp->bridge, pages, type))) { + drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS); + return -ENOMEM; + } + + entry->handle = (unsigned long)memory->key + 1; + entry->memory = memory; + 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; + + request.handle = entry->handle; + request.physical = memory->physical; + + if (copy_to_user(argp, &request, sizeof(request))) { + dev->agp->memory = entry->next; + dev->agp->memory->prev = NULL; + drm_free_agp(memory, pages); + drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS); + return -EFAULT; + } + return 0; +} + +/** + * 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 drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t *dev, + unsigned long handle) +{ + drm_agp_mem_t *entry; + + for (entry = dev->agp->memory; entry; entry = entry->next) { + if (entry->handle == handle) + return entry; + } + return NULL; +} + +/** + * Unbind AGP memory from the GATT (ioctl). + * + * \param inode device inode. + * \param filp file pointer. + * \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 inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_agp_binding_t request; + drm_agp_mem_t *entry; + int ret; + + if (!dev->agp || !dev->agp->acquired) + return -EINVAL; + if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request))) + return -EFAULT; + 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; +} + +/** + * Bind AGP memory into the GATT (ioctl) + * + * \param inode device inode. + * \param filp file pointer. + * \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 inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_agp_binding_t request; + drm_agp_mem_t *entry; + int retcode; + int page; + + if (!dev->agp || !dev->agp->acquired) + return -EINVAL; + if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request))) + return -EFAULT; + 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; +} + +/** + * Free AGP memory (ioctl). + * + * \param inode device inode. + * \param filp file 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 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 inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_agp_buffer_t request; + drm_agp_mem_t *entry; + + if (!dev->agp || !dev->agp->acquired) + return -EINVAL; + if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request))) + return -EFAULT; + if (!(entry = drm_agp_lookup_entry(dev, request.handle))) + return -EINVAL; + if (entry->bound) + drm_unbind_agp(entry->memory); + + if (entry->prev) + entry->prev->next = entry->next; + else + dev->agp->memory = entry->next; + + if (entry->next) + entry->next->prev = entry->prev; + + drm_free_agp(entry->memory, entry->pages); + drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS); + return 0; +} + +/** + * Initialize the AGP resources. + * + * \return pointer to a drm_agp_head structure. + * + */ +drm_agp_head_t *drm_agp_init(drm_device_t *dev) +{ + drm_agp_head_t *head = NULL; + + if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS))) + return NULL; + memset((void *)head, 0, sizeof(*head)); + head->bridge = agp_find_bridge(dev->pdev); + if (!head->bridge) { + if (!(head->bridge = agp_backend_acquire(dev->pdev))) { + drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS); + 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) { + drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS); + return NULL; + } + head->memory = NULL; +#if LINUX_VERSION_CODE <= 0x020408 + head->cant_use_aperture = 0; + head->page_mask = ~(0xfff); +#else + head->cant_use_aperture = head->agp_info.cant_use_aperture; + head->page_mask = head->agp_info.page_mask; +#endif + + return head; +} + +/** Calls agp_allocate_memory() */ +DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge, size_t pages, u32 type) +{ + return agp_allocate_memory(bridge, pages, type); +} + +/** Calls agp_free_memory() */ +int drm_agp_free_memory(DRM_AGP_MEM *handle) +{ + if (!handle) + return 0; + agp_free_memory(handle); + return 1; +} + +/** Calls agp_bind_memory() */ +int drm_agp_bind_memory(DRM_AGP_MEM *handle, off_t start) +{ + if (!handle) + return -EINVAL; + return agp_bind_memory(handle, start); +} + +/** Calls agp_unbind_memory() */ +int drm_agp_unbind_memory(DRM_AGP_MEM *handle) +{ + if (!handle) + return -EINVAL; + return agp_unbind_memory(handle); +} + +#endif /* __OS_HAS_AGP */ |