7927096868
With this commit:
2a0788dc9b x86: Use clflushopt in drm_clflush_virt_range
If clflushopt is available on the system, we use it instead of clflush
in drm_clflush_virt_range. There were two calls to clflush in this
function, but only one was changed to clflushopt. This patch changes
the other clflush call to clflushopt.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reported-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Cc: H Peter Anvin <h.peter.anvin@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
154 lines
4 KiB
C
154 lines
4 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 <drm/drmP.h>
|
|
|
|
#if defined(CONFIG_X86)
|
|
|
|
/*
|
|
* clflushopt is an unordered instruction which needs fencing with mfence or
|
|
* sfence to avoid ordering issues. For drm_clflush_page this fencing happens
|
|
* in the caller.
|
|
*/
|
|
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)
|
|
clflushopt(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)
|
|
{
|
|
|
|
#if defined(CONFIG_X86)
|
|
if (cpu_has_clflush) {
|
|
drm_cache_flush_clflush(pages, num_pages);
|
|
return;
|
|
}
|
|
|
|
if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
|
|
printk(KERN_ERR "Timed out waiting for cache flush.\n");
|
|
|
|
#elif defined(__powerpc__)
|
|
unsigned long i;
|
|
for (i = 0; i < num_pages; i++) {
|
|
struct page *page = pages[i];
|
|
void *page_virtual;
|
|
|
|
if (unlikely(page == NULL))
|
|
continue;
|
|
|
|
page_virtual = kmap_atomic(page);
|
|
flush_dcache_range((unsigned long)page_virtual,
|
|
(unsigned long)page_virtual + PAGE_SIZE);
|
|
kunmap_atomic(page_virtual);
|
|
}
|
|
#else
|
|
printk(KERN_ERR "Architecture has no drm_cache.c support\n");
|
|
WARN_ON_ONCE(1);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(drm_clflush_pages);
|
|
|
|
void
|
|
drm_clflush_sg(struct sg_table *st)
|
|
{
|
|
#if defined(CONFIG_X86)
|
|
if (cpu_has_clflush) {
|
|
struct sg_page_iter sg_iter;
|
|
|
|
mb();
|
|
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
|
|
drm_clflush_page(sg_page_iter_page(&sg_iter));
|
|
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_sg);
|
|
|
|
void
|
|
drm_clflush_virt_range(void *addr, unsigned long length)
|
|
{
|
|
#if defined(CONFIG_X86)
|
|
if (cpu_has_clflush) {
|
|
void *end = addr + length;
|
|
mb();
|
|
for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
|
|
clflushopt(addr);
|
|
clflushopt(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);
|