drm/linux-core/drm_scatter.c

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/**
* \file drm_scatter.c
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* IOCTLs to manage scatter/gather memory
*
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
*
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* 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.
*/
#include <linux/vmalloc.h>
#include "drmP.h"
#define DEBUG_SCATTER 0
void drm_sg_cleanup(drm_sg_mem_t * entry)
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{
struct page *page;
int i;
for (i = 0; i < entry->pages; i++) {
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page = entry->pagelist[i];
if (page)
ClearPageReserved(page);
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}
vfree(entry->virtual);
drm_free(entry->busaddr,
entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
drm_free(entry->pagelist,
entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES);
drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
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}
EXPORT_SYMBOL(drm_sg_cleanup);
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#ifdef _LP64
# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
#else
# define ScatterHandle(x) (unsigned int)(x)
#endif
int drm_sg_alloc(drm_device_t * dev, drm_scatter_gather_t * request)
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{
drm_sg_mem_t *entry;
unsigned long pages, i, j;
DRM_DEBUG("%s\n", __FUNCTION__);
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EINVAL;
if (dev->sg)
return -EINVAL;
entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS);
if (!entry)
return -ENOMEM;
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memset(entry, 0, sizeof(*entry));
pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
DRM_DEBUG("sg size=%ld pages=%ld\n", request->size, pages);
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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;
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}
memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));
entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr),
DRM_MEM_PAGES);
if (!entry->busaddr) {
drm_free(entry->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES);
drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
return -ENOMEM;
}
memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr));
entry->virtual = vmalloc_32(pages << PAGE_SHIFT);
if (!entry->virtual) {
drm_free(entry->busaddr,
entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
drm_free(entry->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES);
drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
return -ENOMEM;
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}
/* 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);
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entry->handle = ScatterHandle((unsigned long)entry->virtual);
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DRM_DEBUG("sg alloc handle = %08lx\n", entry->handle);
DRM_DEBUG("sg alloc virtual = %p\n", entry->virtual);
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for (i = (unsigned long)entry->virtual, j = 0; j < pages;
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i += PAGE_SIZE, j++) {
entry->pagelist[j] = vmalloc_to_page((void *)i);
if (!entry->pagelist[j])
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goto failed;
SetPageReserved(entry->pagelist[j]);
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}
request->handle = entry->handle;
dev->sg = entry;
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#if DEBUG_SCATTER
/* Verify that each page points to its virtual address, and vice
* versa.
*/
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{
int error = 0;
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for (i = 0; i < pages; i++) {
unsigned long *tmp;
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tmp = page_address(entry->pagelist[i]);
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;
DRM_ERROR("Scatter allocation error, "
"pagelist does not match "
"virtual mapping\n");
}
}
tmp = page_address(entry->pagelist[i]);
for (j = 0;
j < PAGE_SIZE / sizeof(unsigned long);
j++, tmp++) {
*tmp = 0;
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}
}
if (error == 0)
DRM_ERROR("Scatter allocation matches pagelist\n");
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}
#endif
return 0;
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failed:
drm_sg_cleanup(entry);
return -ENOMEM;
}
EXPORT_SYMBOL(drm_sg_alloc);
int drm_sg_alloc_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_scatter_gather_t __user *argp = (void __user *)arg;
drm_scatter_gather_t request;
int ret;
if (copy_from_user(&request, argp, sizeof(request)))
return -EFAULT;
ret = drm_sg_alloc(priv->head->dev, &request);
if ( ret ) return ret;
if (copy_to_user(argp, &request, sizeof(request))) {
drm_sg_cleanup(priv->head->dev->sg);
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priv->head->dev->sg = NULL;
return -EFAULT;
}
return 0;
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}
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int drm_sg_free(struct drm_device *dev, unsigned long handle)
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{
drm_sg_mem_t *entry;
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EINVAL;
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entry = dev->sg;
dev->sg = NULL;
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if (!entry || entry->handle != handle)
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return -EINVAL;
DRM_DEBUG("sg free virtual = %p\n", entry->virtual);
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drm_sg_cleanup(entry);
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return 0;
}
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EXPORT_SYMBOL(drm_sg_free);
int drm_sg_free_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->head->dev;
struct drm_scatter_gather __user *argp = (void __user *)arg;
struct drm_scatter_gather request;
if (copy_from_user(&request, argp, sizeof(request)))
return -EFAULT;
return drm_sg_free(dev, request.handle);
}