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/**
* \file drm_pci.h
* \brief ioctl's to manage PCI memory
*
* \warning These interfaces aren't stable yet.
*
* \todo Implement the remaining ioctl's for the PCI pools.
* \todo Add support to map these buffers.
* \todo The wrappers here are so thin that they would be better off inlined..
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
*/
/*
* Copyright 2003 José Fonseca.
* 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 THE
* AUTHOR 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.
*/
#define __NO_VERSION__
#include <linux/pci.h>
#include "drmP.h"
/**********************************************************************/
/** \name PCI memory */
/*@{*/
/**
* \brief Allocate a PCI consistent memory block, for DMA.
*/
void * DRM(pci_alloc)( drm_device_t *dev, size_t size,
dma_addr_t *busaddr )
{
return pci_alloc_consistent( dev->pdev, size, busaddr );
}
/**
* \brief Free a PCI consistent memory block.
*/
void DRM(pci_free)( drm_device_t *dev, size_t size, void *cpuaddr,
dma_addr_t busaddr )
{
DRM_DEBUG( "%s\n", __FUNCTION__ );
pci_free_consistent( dev->pdev, size, cpuaddr, busaddr );
}
/*@}*/
/**********************************************************************/
/** \name PCI memory pool */
/*@{*/
/**
* \brief Create a pool of PCI consistent memory blocks, for DMA.
*
* \return a handle on success, or NULL on failure.
*
* \note This is a minimalistic wrapper around Linux's pci_pool_create()
* function to ease porting to other OS's. More functionality can be exposed
* later if actually required by the drivers.
*/
void *DRM(pci_pool_create)( drm_device_t *dev, size_t size, size_t align )
{
DRM_DEBUG( "%s\n", __FUNCTION__ );
return pci_pool_create( "DRM", dev->pdev, size, align, 0, 0);
}
/**
* \brief Destroy a pool of PCI consistent memory blocks.
*/
void DRM(pci_pool_destroy)( drm_device_t *dev, void *entry )
{
DRM_DEBUG( "%s\n", __FUNCTION__ );
pci_pool_destroy( (struct pci_pool *)entry );
}
/**
* \brief Allocate a block from a PCI consistent memory block pool.
*
* \return the virtual address of a block on success, or NULL on failure.
*/
void *DRM(pci_pool_alloc)( void *entry, dma_addr_t *busaddr )
{
DRM_DEBUG( "%s\n", __FUNCTION__ );
return pci_pool_alloc( (struct pci_pool *)entry, 0, busaddr );
}
/**
* \brief Free a block back into a PCI consistent memory block pool.
*/
void DRM(pci_pool_free)( void *entry, void *cpuaddr, dma_addr_t busaddr )
{
DRM_DEBUG( "%s\n", __FUNCTION__ );
pci_pool_free( (struct pci_pool *)entry, cpuaddr, busaddr );
}
/*@}*/
/**********************************************************************/
/** \name Ioctl's */
/*@{*/
int DRM(pci_alloc_ioctl)( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_pci_mem_ioctl_t request;
drm_pci_mem_t *entry;
DRM_DEBUG( "%s\n", __FUNCTION__ );
if ( copy_from_user( &request,
(drm_pci_mem_ioctl_t *)arg,
sizeof(request) ) )
return -EFAULT;
entry = DRM(alloc)( sizeof(*entry), DRM_MEM_DRIVER );
if ( !entry )
return -ENOMEM;
memset( entry, 0, sizeof(*entry) );
entry->cpuaddr = DRM(pci_alloc)( dev, request.size,
&entry->busaddr );
if ( !entry->cpuaddr ) {
DRM(free)( entry, sizeof(*entry), DRM_MEM_DRIVER );
return -ENOMEM;
}
entry->size = request.size;
request.busaddr = entry->busaddr;
if ( copy_to_user( (drm_pci_mem_ioctl_t *)arg,
&request,
sizeof(request) ) ) {
DRM(pci_free)( dev, entry->size, entry->cpuaddr,
entry->busaddr );
DRM(free)( entry, sizeof(*entry), DRM_MEM_DRIVER );
return -EFAULT;
}
list_add( (struct list_head *)entry, &dev->pci_mem );
return 0;
}
int DRM(pci_free_ioctl)( struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg )
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_pci_mem_ioctl_t request;
struct list_head *ptr;
drm_pci_mem_t *entry;
DRM_DEBUG( "%s\n", __FUNCTION__ );
if ( copy_from_user( &request,
(drm_pci_mem_ioctl_t *)arg,
sizeof(request) ) )
return -EFAULT;
list_for_each(ptr, &dev->pci_mem)
{
entry = list_entry(ptr, drm_pci_mem_t, list);
if( entry->busaddr == request.busaddr ) {
list_del(ptr);
DRM(pci_free)( dev, entry->size, entry->cpuaddr,
entry->busaddr );
DRM(free)( entry, sizeof(*entry), DRM_MEM_DRIVER );
return 0;
}
}
return -EFAULT;
}
/*@}*/
/**********************************************************************/
/** \name Cleanup */
/*@{*/
/**
* \brief Called on driver exit to free the PCI memory allocated by userspace.
*/
void DRM(pci_cleanup)( drm_device_t *dev )
{
struct list_head *ptr, *tmp;
drm_pci_mem_t *entry;
DRM_DEBUG( "%s\n", __FUNCTION__ );
list_for_each_safe(ptr, tmp, &dev->pci_mem)
{
entry = list_entry(ptr, drm_pci_mem_t, list);
list_del(ptr);
DRM(pci_free)( dev, entry->size, entry->cpuaddr,
entry->busaddr );
DRM(free)( entry, sizeof(*entry), DRM_MEM_DRIVER );
}
}
/*@}*/
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