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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2014-02-26 20:06:51 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-02-27 17:26:20 +0100 |
| commit | 2a0c772f1967565d5b71a98012e74d5a7bddc1c4 (patch) | |
| tree | 0a6bc099e63beb9ba42bccd8e0e63dbbde8af073 /drivers/gpu/drm/drm_cache.c | |
| parent | x86: Use clflushopt in clflush_cache_range (diff) | |
| download | linux-2a0c772f1967565d5b71a98012e74d5a7bddc1c4.tar.xz linux-2a0c772f1967565d5b71a98012e74d5a7bddc1c4.zip | |
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.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index bb8f58012189..c518fb6cfb63 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); } |