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authorRoss Zwisler <ross.zwisler@linux.intel.com>2014-02-26 12:06:51 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2014-02-27 08:26:20 -0800
commit2a0c772f1967565d5b71a98012e74d5a7bddc1c4 (patch)
tree0a6bc099e63beb9ba42bccd8e0e63dbbde8af073 /drivers/gpu/drm/drm_cache.c
parent8b80fd8b45458a7d0b726d454c51c5219e0fb2ee (diff)
x86: Use clflushopt in drm_clflush_page
If clflushopt is available on the system, use it instead of clflush in drm_clflush_page. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Link: http://lkml.kernel.org/r/1393441612-19729-4-git-send-email-ross.zwisler@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/drm_cache.c')
-rw-r--r--drivers/gpu/drm/drm_cache.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index bb8f5801218..c518fb6cfb6 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -32,6 +32,12 @@
#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)
{
@@ -44,7 +50,7 @@ drm_clflush_page(struct page *page)
page_virtual = kmap_atomic(page);
for (i = 0; i < PAGE_SIZE; i += size)
- clflush(page_virtual + i);
+ clflushopt(page_virtual + i);
kunmap_atomic(page_virtual);
}