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Diffstat (limited to 'linux-core/drm_ttm.c')
-rw-r--r--linux-core/drm_ttm.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/linux-core/drm_ttm.c b/linux-core/drm_ttm.c
index 599589fc..7344acce 100644
--- a/linux-core/drm_ttm.c
+++ b/linux-core/drm_ttm.c
@@ -28,6 +28,18 @@
#include "drmP.h"
+static void drm_ttm_ipi_handler(void *null)
+{
+ wbinvd();
+}
+
+static void drm_ttm_cache_flush(void)
+{
+ if (on_each_cpu(drm_ttm_ipi_handler, NULL, 1, 1) != 0)
+ DRM_ERROR("Timed out waiting for drm cache flush.\n");
+}
+
+
/*
* Use kmalloc if possible. Otherwise fall back to vmalloc.
*/
@@ -99,6 +111,9 @@ static int drm_set_caching(drm_ttm_t * ttm, int noncached)
if ((ttm->page_flags & DRM_TTM_PAGE_UNCACHED) == noncached)
return 0;
+ if (noncached)
+ drm_ttm_cache_flush();
+
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages + i;
if (*cur_page) {