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/* scatter.c -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
* Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
*
* 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
* PRECISION INSIGHT 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.
*
* Authors:
* Gareth Hughes <gareth@valinux.com>
*
*/
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/vmalloc.h>
#include "drmP.h"
#include <linux/wrapper.h>
#define DEBUG_SCATTER 0
void drm_sg_cleanup( drm_sg_mem_t *entry )
{
int i;
for ( i = 0 ; i < entry->pages ; i++ ) {
ClearPageReserved( entry->pagelist[i] );
}
vfree( entry->virtual );
drm_free( entry->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
drm_free( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
}
static inline long usec( void )
{
struct timeval tv;
do_gettimeofday( &tv );
return (tv.tv_sec & 0x7ff) * 1000000 + tv.tv_usec;
}
int drm_sg_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->dev;
drm_scatter_gather_t request;
drm_sg_mem_t *entry;
unsigned long pages, i, j;
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
DRM_DEBUG( "%s\n", __FUNCTION__ );
if ( dev->sg ) return -EINVAL;
if ( copy_from_user( &request,
(drm_scatter_gather_t *)arg,
sizeof(request) ) )
return -EFAULT;
entry = drm_alloc( sizeof(*entry), DRM_MEM_SGLISTS );
if ( !entry ) return -ENOMEM;
memset( entry, 0, sizeof(*entry) );
pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
entry->pages = pages;
entry->pagelist = drm_alloc( pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
if ( !entry->pagelist ) {
drm_free( entry, sizeof(*entry), DRM_MEM_SGLISTS );
return -ENOMEM;
}
/* FIXME: We should really have a kernel call for this...
*/
entry->virtual = __vmalloc( (pages << PAGE_SHIFT),
GFP_KERNEL,
PAGE_KERNEL);
if ( !entry->virtual ) {
drm_free( entry->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
drm_free( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
return -ENOMEM;
}
/* This also forces the mapping of COW pages, so our page list
* will be valid. Please don't remove it...
*/
memset( entry->virtual, 0, pages << PAGE_SHIFT );
entry->handle = (unsigned long)entry->virtual;
DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
for ( i = entry->handle, j = 0 ; j < pages ; i += PAGE_SIZE, j++ ) {
pgd = pgd_offset_k( i );
if ( pgd_present( *pgd ) && ( pmd = pmd_offset( pgd, i ) )
&& pmd_present( *pmd ) && ( pte = pte_offset( pmd, i ) )
&& pte_present( *pte ) )
entry->pagelist[j] = pte_page( *pte );
else
{
vfree( entry->virtual );
drm_free( entry->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
drm_free( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
return -ENOMEM;
}
SetPageReserved( entry->pagelist[j] );
if ( j < 16 ) {
DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n",
i, j,
(unsigned long)entry->pagelist[j]->virtual);
}
}
request.handle = entry->handle;
if ( copy_to_user( (drm_scatter_gather_t *)arg,
&request,
sizeof(request) ) ) {
drm_sg_cleanup( entry );
return -EFAULT;
}
dev->sg = entry;
#if DEBUG_SCATTER
/* Verify that each page points to its virtual address, and vice
* versa.
*/
{
int error = 0;
for(i = 0; i < pages; i++) {
unsigned long *tmp;
tmp = (unsigned long *)entry->pagelist[i]->virtual;
for(j = 0; j < PAGE_SIZE / sizeof(unsigned long); j++, tmp++) {
*tmp = 0xcafebabe;
}
tmp = (unsigned long *)((u8 *)entry->virtual +
(PAGE_SIZE * i));
for(j = 0; j < PAGE_SIZE / sizeof(unsigned long); j++, tmp++) {
if(*tmp != 0xcafebabe && error == 0) {
error = 1;
printk("Scatter allocation error, pagelist"
" does not match virtual mapping\n");
}
}
tmp = (unsigned long *)entry->pagelist[i]->virtual;
for(j = 0; j < PAGE_SIZE / sizeof(unsigned long); j++, tmp++) {
*tmp = 0;
}
}
if(error == 0) printk("Scatter allocation matches pagelist\n");
}
#endif
return 0;
}
int drm_sg_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->dev;
drm_scatter_gather_t request;
drm_sg_mem_t *entry;
if ( copy_from_user( &request,
(drm_scatter_gather_t *)arg,
sizeof(request) ) )
return -EFAULT;
entry = dev->sg;
dev->sg = NULL;
if ( !entry || entry->handle != request.handle ) return -EINVAL;
DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
drm_sg_cleanup( entry );
return 0;
}
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