kolibrios/drivers/video/drm/drm_cache.c
Sergey Semyonov (Serge) da432de99f i915: 3.12.9
git-svn-id: svn://kolibrios.org@4539 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-01-27 20:10:22 +00:00

156 lines
3.8 KiB
C

/**************************************************************************
*
* Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
* 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS 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: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include <linux/export.h>
#include <linux/scatterlist.h>
#include <drm/drmP.h>
extern int x86_clflush_size;
static inline void clflush(volatile void *__p)
{
asm volatile("clflush %0" : "+m" (*(volatile char*)__p));
}
#if 0
static void
drm_clflush_page(struct page *page)
{
uint8_t *page_virtual;
unsigned int i;
const int size = boot_cpu_data.x86_clflush_size;
if (unlikely(page == NULL))
return;
page_virtual = kmap_atomic(page);
for (i = 0; i < PAGE_SIZE; i += size)
clflush(page_virtual + i);
kunmap_atomic(page_virtual);
}
static void drm_cache_flush_clflush(struct page *pages[],
unsigned long num_pages)
{
unsigned long i;
mb();
for (i = 0; i < num_pages; i++)
drm_clflush_page(*pages++);
mb();
}
static void
drm_clflush_ipi_handler(void *null)
{
wbinvd();
}
#endif
void
drm_clflush_pages(struct page *pages[], unsigned long num_pages)
{
uint8_t *pva;
unsigned int i, j;
pva = AllocKernelSpace(4096);
if(pva != NULL)
{
dma_addr_t *src, *dst;
u32 count;
for (i = 0; i < num_pages; i++)
{
mb();
MapPage(pva, page_to_phys(pages[i]), 0x001);
for (j = 0; j < PAGE_SIZE; j += x86_clflush_size)
clflush(pva + j);
}
FreeKernelSpace(pva);
}
mb();
}
EXPORT_SYMBOL(drm_clflush_pages);
void
drm_clflush_sg(struct sg_table *st)
{
struct sg_page_iter sg_iter;
struct page *page;
uint8_t *pva;
unsigned int i;
pva = AllocKernelSpace(4096);
if( pva != NULL)
{
mb();
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
{
page = sg_page_iter_page(&sg_iter);
MapPage(pva,page_to_phys(page), 0x001);
for (i = 0; i < PAGE_SIZE; i += x86_clflush_size)
clflush(pva + i);
};
FreeKernelSpace(pva);
};
mb();
}
EXPORT_SYMBOL(drm_clflush_sg);
#if 0
void
drm_clflush_virt_range(char *addr, unsigned long length)
{
#if defined(CONFIG_X86)
if (cpu_has_clflush) {
char *end = addr + length;
mb();
for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
clflush(addr);
clflush(end - 1);
mb();
return;
}
if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#else
printk(KERN_ERR "Architecture has no drm_cache.c support\n");
WARN_ON_ONCE(1);
#endif
}
EXPORT_SYMBOL(drm_clflush_virt_range);
#endif