Merge branch 'drm-intel-next' of git://people.freedesktop.org/~danvet/drm-intel into...

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / drm_cache.c

diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 4b8653b932f9a3216a3b43038b22ed96bb8709c9..08758e061478eb77e2db77794d1d5e54c8625474 100644 (file)
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -98,3 +98,26 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
 #endif
 }
 EXPORT_SYMBOL(drm_clflush_pages);
+
+void
+drm_clflush_virt_range(char *addr, unsigned long length)
+{
+#if defined(CONFIG_X86)
+       if (cpu_has_clflush) {
+               char *end = addr + length;
+               mb();
+               for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
+                       clflush(addr);
+               clflush(end - 1);
+               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_virt_range);