If clwb is available on the system, use it in drm_clflush_page. If clwb is not available, fall back to clflushopt if you can. If clflushopt is not supported, fall all the way back to clflush. Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Cc: H Peter Anvin <h.peter.anvin@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: David Airlie <airlied@xxxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx Cc: x86@xxxxxxxxxx --- drivers/gpu/drm/drm_cache.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index a6b6906..aad9d82 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -34,9 +34,9 @@ #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. + * clwb and clflushopt are unordered instructions which need 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) @@ -50,7 +50,7 @@ drm_clflush_page(struct page *page) page_virtual = kmap_atomic(page); for (i = 0; i < PAGE_SIZE; i += size) - clflushopt(page_virtual + i); + clwb(page_virtual + i); kunmap_atomic(page_virtual); } -- 1.9.3 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
