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467 lines
13 KiB
467 lines
13 KiB
/**
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* \file drm_agpsupport.h
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* DRM support for AGP/GART backend
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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#include <linux/module.h>
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#if __OS_HAS_AGP
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/**
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* Get AGP information.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg pointer to a (output) drm_agp_info structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device has been initialized and acquired and fills in the
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* drm_agp_info structure with the information in drm_agp_head::agp_info.
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*/
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int drm_agp_info(drm_device_t *dev, drm_agp_info_t *info)
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{
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DRM_AGP_KERN *kern;
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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kern = &dev->agp->agp_info;
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info->agp_version_major = kern->version.major;
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info->agp_version_minor = kern->version.minor;
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info->mode = kern->mode;
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info->aperture_base = kern->aper_base;
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info->aperture_size = kern->aper_size * 1024 * 1024;
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info->memory_allowed = kern->max_memory << PAGE_SHIFT;
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info->memory_used = kern->current_memory << PAGE_SHIFT;
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info->id_vendor = kern->device->vendor;
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info->id_device = kern->device->device;
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return 0;
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}
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EXPORT_SYMBOL(drm_agp_info);
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int drm_agp_info_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_agp_info_t info;
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int err;
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err = drm_agp_info(dev, &info);
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if (err)
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return err;
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if (copy_to_user((drm_agp_info_t __user *) arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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/**
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* Acquire the AGP device.
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*
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* \param dev DRM device that is to acquire AGP
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device hasn't been acquired before and calls
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* \c agp_backend_acquire.
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*/
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int drm_agp_acquire(drm_device_t *dev)
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{
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if (!dev->agp)
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return -ENODEV;
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if (dev->agp->acquired)
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return -EBUSY;
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if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
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return -ENODEV;
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dev->agp->acquired = 1;
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return 0;
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}
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EXPORT_SYMBOL(drm_agp_acquire);
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/**
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* Acquire the AGP device (ioctl).
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device hasn't been acquired before and calls
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* \c agp_backend_acquire.
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*/
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int drm_agp_acquire_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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return drm_agp_acquire( (drm_device_t *) priv->head->dev );
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}
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/**
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* Release the AGP device.
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*
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* \param dev DRM device that is to release AGP
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device has been acquired and calls \c agp_backend_release.
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*/
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int drm_agp_release(drm_device_t *dev)
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{
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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agp_backend_release(dev->agp->bridge);
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dev->agp->acquired = 0;
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return 0;
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}
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EXPORT_SYMBOL(drm_agp_release);
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int drm_agp_release_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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return drm_agp_release(dev);
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}
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/**
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* Enable the AGP bus.
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*
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* \param dev DRM device that has previously acquired AGP.
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* \param mode Requested AGP mode.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device has been acquired but not enabled, and calls
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* \c agp_enable.
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*/
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int drm_agp_enable(drm_device_t *dev, drm_agp_mode_t mode)
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{
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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dev->agp->mode = mode.mode;
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agp_enable(dev->agp->bridge, mode.mode);
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dev->agp->base = dev->agp->agp_info.aper_base;
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dev->agp->enabled = 1;
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return 0;
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}
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EXPORT_SYMBOL(drm_agp_enable);
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int drm_agp_enable_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_agp_mode_t mode;
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if (copy_from_user(&mode, (drm_agp_mode_t __user *) arg, sizeof(mode)))
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return -EFAULT;
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return drm_agp_enable(dev, mode);
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}
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/**
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* Allocate AGP memory.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg pointer to a drm_agp_buffer structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device is present and has been acquired, allocates the
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* memory via alloc_agp() and creates a drm_agp_mem entry for it.
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*/
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int drm_agp_alloc(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_agp_buffer_t request;
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drm_agp_mem_t *entry;
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DRM_AGP_MEM *memory;
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unsigned long pages;
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u32 type;
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drm_agp_buffer_t __user *argp = (void __user *)arg;
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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if (copy_from_user(&request, argp, sizeof(request)))
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return -EFAULT;
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if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
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return -ENOMEM;
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memset(entry, 0, sizeof(*entry));
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pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
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type = (u32) request.type;
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if (!(memory = drm_alloc_agp(dev, pages, type))) {
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drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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return -ENOMEM;
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}
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entry->handle = (unsigned long)memory->key + 1;
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entry->memory = memory;
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entry->bound = 0;
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entry->pages = pages;
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entry->prev = NULL;
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entry->next = dev->agp->memory;
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if (dev->agp->memory)
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dev->agp->memory->prev = entry;
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dev->agp->memory = entry;
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request.handle = entry->handle;
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request.physical = memory->physical;
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if (copy_to_user(argp, &request, sizeof(request))) {
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dev->agp->memory = entry->next;
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dev->agp->memory->prev = NULL;
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drm_free_agp(memory, pages);
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drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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return -EFAULT;
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}
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return 0;
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}
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/**
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* Search for the AGP memory entry associated with a handle.
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*
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* \param dev DRM device structure.
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* \param handle AGP memory handle.
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* \return pointer to the drm_agp_mem structure associated with \p handle.
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*
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* Walks through drm_agp_head::memory until finding a matching handle.
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*/
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static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t *dev,
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unsigned long handle)
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{
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drm_agp_mem_t *entry;
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for (entry = dev->agp->memory; entry; entry = entry->next) {
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if (entry->handle == handle)
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return entry;
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}
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return NULL;
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}
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/**
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* Unbind AGP memory from the GATT (ioctl).
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg pointer to a drm_agp_binding structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device is present and acquired, looks-up the AGP memory
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* entry and passes it to the unbind_agp() function.
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*/
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int drm_agp_unbind(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_agp_binding_t request;
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drm_agp_mem_t *entry;
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int ret;
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
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return -EFAULT;
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if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
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return -EINVAL;
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if (!entry->bound)
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return -EINVAL;
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ret = drm_unbind_agp(entry->memory);
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if (ret == 0)
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entry->bound = 0;
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return ret;
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}
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/**
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* Bind AGP memory into the GATT (ioctl)
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg pointer to a drm_agp_binding structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device is present and has been acquired and that no memory
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* is currently bound into the GATT. Looks-up the AGP memory entry and passes
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* it to bind_agp() function.
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*/
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int drm_agp_bind(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_agp_binding_t request;
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drm_agp_mem_t *entry;
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int retcode;
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int page;
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
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return -EFAULT;
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if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
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return -EINVAL;
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if (entry->bound)
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return -EINVAL;
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page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
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if ((retcode = drm_bind_agp(entry->memory, page)))
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return retcode;
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entry->bound = dev->agp->base + (page << PAGE_SHIFT);
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DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
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dev->agp->base, entry->bound);
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return 0;
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}
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/**
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* Free AGP memory (ioctl).
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg pointer to a drm_agp_buffer structure.
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* \return zero on success or a negative number on failure.
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*
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* Verifies the AGP device is present and has been acquired and looks up the
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* AGP memory entry. If the memory it's currently bound, unbind it via
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* unbind_agp(). Frees it via free_agp() as well as the entry itself
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* and unlinks from the doubly linked list it's inserted in.
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*/
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int drm_agp_free(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_agp_buffer_t request;
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drm_agp_mem_t *entry;
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
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return -EFAULT;
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if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
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return -EINVAL;
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if (entry->bound)
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drm_unbind_agp(entry->memory);
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if (entry->prev)
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entry->prev->next = entry->next;
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else
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dev->agp->memory = entry->next;
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if (entry->next)
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entry->next->prev = entry->prev;
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drm_free_agp(entry->memory, entry->pages);
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drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
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return 0;
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}
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/**
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* Initialize the AGP resources.
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*
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* \return pointer to a drm_agp_head structure.
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*
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*/
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drm_agp_head_t *drm_agp_init(drm_device_t *dev)
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{
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drm_agp_head_t *head = NULL;
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if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
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return NULL;
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memset((void *)head, 0, sizeof(*head));
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head->bridge = agp_find_bridge(dev->pdev);
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if (!head->bridge) {
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if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
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drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
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return NULL;
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}
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agp_copy_info(head->bridge, &head->agp_info);
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agp_backend_release(head->bridge);
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} else {
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agp_copy_info(head->bridge, &head->agp_info);
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}
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if (head->agp_info.chipset == NOT_SUPPORTED) {
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drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
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return NULL;
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}
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head->memory = NULL;
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head->cant_use_aperture = head->agp_info.cant_use_aperture;
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head->page_mask = head->agp_info.page_mask;
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return head;
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}
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/** Calls agp_allocate_memory() */
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DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge, size_t pages, u32 type)
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{
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return agp_allocate_memory(bridge, pages, type);
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}
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/** Calls agp_free_memory() */
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int drm_agp_free_memory(DRM_AGP_MEM *handle)
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{
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if (!handle)
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return 0;
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agp_free_memory(handle);
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return 1;
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}
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/** Calls agp_bind_memory() */
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int drm_agp_bind_memory(DRM_AGP_MEM *handle, off_t start)
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{
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if (!handle)
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return -EINVAL;
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return agp_bind_memory(handle, start);
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}
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EXPORT_SYMBOL(drm_agp_bind_memory);
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/** Calls agp_unbind_memory() */
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int drm_agp_unbind_memory(DRM_AGP_MEM *handle)
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{
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if (!handle)
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return -EINVAL;
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return agp_unbind_memory(handle);
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}
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#endif /* __OS_HAS_AGP */
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