Add arm64 support for drm_clflush_virt_range. dcache_clean_inval_poc
performs a flush by first performing a clean, follow by an invalidation
operation.
v2 (Michael Cheng): Use correct macro for cleaning and invalidation the
dcache.
v3 (Michael Cheng): Remove ifdef for asm/cacheflush.h
v4 (Michael Cheng): Rebase
Signed-off-by: Michael Cheng <michael.cheng@xxxxxxxxx>
---
drivers/gpu/drm/drm_cache.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 66597e411764..ec8d91b088ff 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -28,6 +28,7 @@
* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
+#include <asm/cacheflush.h>
#include <linux/cc_platform.h>
#include <linux/export.h>
#include <linux/highmem.h>
@@ -174,6 +175,10 @@ drm_clflush_virt_range(void *addr, unsigned long length)
if (wbinvd_on_all_cpus())
pr_err("Timed out waiting for cache flush\n");
+
+#elif defined(CONFIG_ARM64)
+ void *end = addr + length;
+ dcache_clean_inval_poc((unsigned long)addr, (unsigned long)end);
#else
WARN_ONCE(1, "Architecture has no drm_cache.c support\n");
#endif
--
2.25.1
