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Subject[PATCH v3 1/3] arm64: mm: add __clean_dcache_area()
Date
Ensure D-cache lines are cleaned to the PoC(Point of Coherency).

This function is called by arch_wb_cache_pmem() to clean the cache lines
and remain the data in cache for the next access.

Signed-off-by: Kwangwoo Lee <kwangwoo.lee@sk.com>
---
arch/arm64/include/asm/cacheflush.h | 1 +
arch/arm64/mm/cache.S | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index c64268d..903a94f 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -68,6 +68,7 @@
extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void flush_icache_range(unsigned long start, unsigned long end);
extern void __flush_dcache_area(void *addr, size_t len);
+extern void __clean_dcache_area(void *addr, size_t len);
extern void __clean_dcache_area_pou(void *addr, size_t len);
extern long __flush_cache_user_range(unsigned long start, unsigned long end);

diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
index 6df0706..5a350e4 100644
--- a/arch/arm64/mm/cache.S
+++ b/arch/arm64/mm/cache.S
@@ -93,6 +93,24 @@ ENTRY(__flush_dcache_area)
ENDPIPROC(__flush_dcache_area)

/*
+ * __clean_dcache_area(kaddr, size)
+ *
+ * Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
+ * are cleaned to the PoC.
+ *
+ * - kaddr - kernel address
+ * - size - size in question
+ */
+ENTRY(__clean_dcache_area)
+alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
+ dcache_by_line_op cvac, sy, x0, x1, x2, x3
+alternative_else
+ dcache_by_line_op civac, sy, x0, x1, x2, x3
+alternative_endif
+ ret
+ENDPROC(__clean_dcache_area)
+
+/*
* __clean_dcache_area_pou(kaddr, size)
*
* Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
--
2.5.0
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