From mboxrd@z Thu Jan 1 00:00:00 1970 From: labbott@redhat.com (Laura Abbott) Date: Mon, 8 Aug 2016 10:49:35 -0700 Subject: [RFCv2][PATCH 3/5] arm64: Implement ARCH_HAS_FORCE_CACHE In-Reply-To: <1470678577-14010-1-git-send-email-labbott@redhat.com> References: <1470678577-14010-1-git-send-email-labbott@redhat.com> Message-ID: <1470678577-14010-4-git-send-email-labbott@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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 #include #include +#include #include #include @@ -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); +} -- 2.7.4