Merge branch 'tracing/urgent' into tracing/core

Merge reason: Pick up latest fixes and update to latest upstream.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 38 insertions, 8 deletions

diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 0e994a0e46d4..0e3bd5b54b78 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -45,6 +45,23 @@ drm_clflush_page(struct page *page)
 		clflush(page_virtual + i);
 	kunmap_atomic(page_virtual, KM_USER0);
 }
+
+static void drm_cache_flush_clflush(struct page *pages[],
+				    unsigned long num_pages)
+{
+	unsigned long i;
+
+	mb();
+	for (i = 0; i < num_pages; i++)
+		drm_clflush_page(*pages++);
+	mb();
+}
+
+static void
+drm_clflush_ipi_handler(void *null)
+{
+	wbinvd();
+}
 #endif
 
 void
@@ -53,17 +70,30 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
 
 #if defined(CONFIG_X86)
 	if (cpu_has_clflush) {
-		unsigned long i;
-
-		mb();
-		for (i = 0; i < num_pages; ++i)
-			drm_clflush_page(*pages++);
-		mb();
-
+		drm_cache_flush_clflush(pages, num_pages);
 		return;
 	}
 
-	wbinvd();
+	if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
+		printk(KERN_ERR "Timed out waiting for cache flush.\n");
+
+#elif defined(__powerpc__)
+	unsigned long i;
+	for (i = 0; i < num_pages; i++) {
+		struct page *page = pages[i];
+		void *page_virtual;
+
+		if (unlikely(page == NULL))
+			continue;
+
+		page_virtual = kmap_atomic(page, KM_USER0);
+		flush_dcache_range((unsigned long)page_virtual,
+				   (unsigned long)page_virtual + PAGE_SIZE);
+		kunmap_atomic(page_virtual, KM_USER0);
+	}
+#else
+	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
+	WARN_ON_ONCE(1);
 #endif
 }
 EXPORT_SYMBOL(drm_clflush_pages);