1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 3dbc7f17eb1..4a4274b348b 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -101,6 +101,31 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
 EXPORT_SYMBOL(drm_clflush_pages);
 
 void
+drm_clflush_sg(struct sg_table *st)
+{
+#if defined(CONFIG_X86)
+        if (cpu_has_clflush) {
+                struct scatterlist *sg;
+                int i;
+
+                mb();
+                for_each_sg(st->sgl, sg, st->nents, i)
+                        drm_clflush_page(sg_page(sg));
+                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(char *addr, unsigned long length)
 {
 #if defined(CONFIG_X86)