drm/ttm: Add some powerpc cache flush code.

Optimise the powerpc flushing path for TTM.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index c27ab3a877ad..0331fa74cd3f 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -68,7 +68,7 @@ static void ttm_tt_cache_flush_clflush(struct page *pages[],
                 ttm_tt_clflush_page(*pages++);
         mb();
 }
-#else
+#elif !defined(__powerpc__)
 static void ttm_tt_ipi_handler(void *null)
 {
         ;
@@ -83,6 +83,15 @@ void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages)
                 ttm_tt_cache_flush_clflush(pages, num_pages);
                 return;
         }
+#elif defined(__powerpc__)
+        unsigned long i;
+
+        for (i = 0; i < num_pages; ++i) {
+                if (pages[i]) {
+                        unsigned long start = (unsigned long)page_address(pages[i]);
+                        flush_dcache_range(start, start + PAGE_SIZE);
+                }
+        }
 #else
         if (on_each_cpu(ttm_tt_ipi_handler, NULL, 1) != 0)
                 printk(KERN_ERR TTM_PFX