arm64 may need to guarantee the caches are synced. Implement versions of the kernel_force_cache API based on the DMA APIs.
Signed-off-by: Laura Abbott labbott@redhat.com --- arch/arm64/include/asm/cacheflush.h | 5 +++++ arch/arm64/mm/flush.c | 11 +++++++++++ 2 files changed, 16 insertions(+)
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index c64268d..9980dd8 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -149,4 +149,9 @@ int set_memory_rw(unsigned long addr, int numpages); int set_memory_x(unsigned long addr, int numpages); int set_memory_nx(unsigned long addr, int numpages);
+#define ARCH_HAS_FORCE_CACHE 1 + +void kernel_force_cache_clean(struct page *page, size_t size); +void kernel_force_cache_invalidate(struct page *page, size_t size); + #endif diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index 43a76b0..0af78ab 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -20,6 +20,7 @@ #include <linux/export.h> #include <linux/mm.h> #include <linux/pagemap.h> +#include <linux/dma-mapping.h>
#include <asm/cacheflush.h> #include <asm/cachetype.h> @@ -94,3 +95,13 @@ EXPORT_SYMBOL(flush_dcache_page); * Additional functions defined in assembly. */ EXPORT_SYMBOL(flush_icache_range); + +void kernel_force_cache_clean(struct page *page, size_t size) +{ + __dma_map_area(page_address(page), size, DMA_BIDIRECTIONAL); +} + +void kernel_force_cache_invalidate(struct page *page, size_t size) +{ + __dma_unmap_area(page_address(page), size, DMA_BIDIRECTIONAL); +}