arm64: Implement pmem API support
Add a clean-to-point-of-persistence cache maintenance helper, and wire
up the basic architectural support for the pmem driver based on it.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[catalin.marinas@arm.com: move arch_*_pmem() functions to arch/arm64/mm/flush.c]
[catalin.marinas@arm.com: change dmb(sy) to dmb(osh)]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 1b67c37..5d8903c 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -353,6 +353,12 @@ alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
alternative_else
dc civac, \kaddr
alternative_endif
+ .elseif (\op == cvap)
+alternative_if ARM64_HAS_DCPOP
+ sys 3, c7, c12, 1, \kaddr // dc cvap
+alternative_else
+ dc cvac, \kaddr
+alternative_endif
.else
dc \op, \kaddr
.endif