470 lines
12 KiB
C
470 lines
12 KiB
C
/**
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* \file drm_agpsupport.c
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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 <drm/drmP.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#if __OS_HAS_AGP
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#include <asm/agp.h>
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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 file_priv DRM file private.
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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(struct drm_device *dev, struct drm_agp_info *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 drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_agp_info *info = data;
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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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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(struct drm_device * 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 file_priv DRM file private.
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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 drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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return drm_agp_acquire((struct drm_device *) file_priv->minor->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(struct drm_device * 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 drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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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(struct drm_device * dev, struct drm_agp_mode 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->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 drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_agp_mode *mode = data;
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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 file_priv file private 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 agp_allocate_memory() and creates a drm_agp_mem entry for it.
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*/
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int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
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{
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struct drm_agp_mem *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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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
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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 = agp_allocate_memory(dev->agp->bridge, pages, type))) {
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kfree(entry);
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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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list_add(&entry->head, &dev->agp->memory);
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request->handle = entry->handle;
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request->physical = memory->physical;
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return 0;
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}
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EXPORT_SYMBOL(drm_agp_alloc);
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int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_agp_buffer *request = data;
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return drm_agp_alloc(dev, request);
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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 struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
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unsigned long handle)
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{
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struct drm_agp_mem *entry;
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list_for_each_entry(entry, &dev->agp->memory, head) {
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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 file_priv DRM file private.
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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 drm_device *dev, struct drm_agp_binding *request)
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{
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struct drm_agp_mem *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 (!(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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EXPORT_SYMBOL(drm_agp_unbind);
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int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_agp_binding *request = data;
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return drm_agp_unbind(dev, request);
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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 file_priv DRM file private.
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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 drm_device *dev, struct drm_agp_binding *request)
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{
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struct drm_agp_mem *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 (!(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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EXPORT_SYMBOL(drm_agp_bind);
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int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_agp_binding *request = data;
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return drm_agp_bind(dev, request);
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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 file_priv DRM file private.
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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 drm_device *dev, struct drm_agp_buffer *request)
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{
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struct drm_agp_mem *entry;
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if (!dev->agp || !dev->agp->acquired)
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return -EINVAL;
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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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list_del(&entry->head);
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drm_free_agp(entry->memory, entry->pages);
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kfree(entry);
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return 0;
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}
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EXPORT_SYMBOL(drm_agp_free);
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int drm_agp_free_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_agp_buffer *request = data;
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return drm_agp_free(dev, request);
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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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* Gets the drm_agp_t structure which is made available by the agpgart module
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* via the inter_module_* functions. Creates and initializes a drm_agp_head
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* structure.
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*/
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struct drm_agp_head *drm_agp_init(struct drm_device *dev)
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{
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struct drm_agp_head *head = NULL;
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if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
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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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kfree(head);
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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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kfree(head);
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return NULL;
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}
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INIT_LIST_HEAD(&head->memory);
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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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head->base = head->agp_info.aper_base;
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return head;
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}
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/**
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* Binds a collection of pages into AGP memory at the given offset, returning
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* the AGP memory structure containing them.
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*
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* No reference is held on the pages during this time -- it is up to the
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* caller to handle that.
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*/
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DRM_AGP_MEM *
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drm_agp_bind_pages(struct drm_device *dev,
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struct page **pages,
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unsigned long num_pages,
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uint32_t gtt_offset,
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u32 type)
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{
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DRM_AGP_MEM *mem;
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int ret, i;
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DRM_DEBUG("\n");
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mem = agp_allocate_memory(dev->agp->bridge, num_pages,
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type);
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if (mem == NULL) {
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DRM_ERROR("Failed to allocate memory for %ld pages\n",
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num_pages);
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return NULL;
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}
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for (i = 0; i < num_pages; i++)
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mem->pages[i] = pages[i];
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mem->page_count = num_pages;
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mem->is_flushed = true;
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ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
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if (ret != 0) {
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DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
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agp_free_memory(mem);
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return NULL;
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}
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return mem;
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}
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EXPORT_SYMBOL(drm_agp_bind_pages);
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#endif /* __OS_HAS_AGP */
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