linux-kernel - [PATCH v3 2/3] arm64: mm: add mmio_flush

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Date:	Fri, 15 Jul 2016 11:46:21 +0900
From:	Kwangwoo Lee <kwangwoo.lee@...com>
To:	linux-arm-kernel@...ts.infradead.org, linux-nvdimm@...ts.01.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>
Cc:	Kwangwoo Lee <kwangwoo.lee@...com>,
	Woosuk Chung <woosuk.chung@...com>,
	Hyunchul Kim <hyunchul3.kim@...com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/3] arm64: mm: add mmio_flush_range() to support pmem

To enable pmem in arm64, mmio_flush_range() is required to build
successfully. If NVDIMM is used as blk mode, not pmem , it is called in
acpi_nfit_blk_single_io() via nd_blk_make_request() on read with
NFIT_BLK_READ_FLUSH flag.

The function cleans and invalidates the cache lines using the argument -
addr and size. Thus, it can be mapped with __flush_dcache_area().

Signed-off-by: Kwangwoo Lee <kwangwoo.lee@...com>
---
 arch/arm64/Kconfig                  | 1 +
 arch/arm64/include/asm/cacheflush.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4f43622..12546ce 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -15,6 +15,7 @@ config ARM64
 	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
 	select ARCH_WANT_FRAME_POINTERS
 	select ARCH_HAS_UBSAN_SANITIZE_ALL
+	select ARCH_HAS_MMIO_FLUSH
 	select ARM_AMBA
 	select ARM_ARCH_TIMER
 	select ARM_GIC
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 903a94f..fba18e4 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -134,6 +134,8 @@ static inline void __flush_icache_all(void)
  */
 #define flush_icache_page(vma,page)	do { } while (0)
 
+#define mmio_flush_range(addr, size)	__flush_dcache_area(addr, size)
+
 /*
  * Not required on AArch64 (PIPT or VIPT non-aliasing D-cache).
  */
-- 
2.5.0