Commit 46710cf1 authored May 24, 2021 by Fuad Tabba Committed by Will Deacon May 25, 2021

arm64: Apply errata to swsusp_arch_suspend_exit



The Arm errata covered by ARM64_WORKAROUND_CLEAN_CACHE require
that "dc cvau" instructions get promoted to "dc civac".

Reported-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20210524083001.2586635-4-tabba@google.com


Signed-off-by: Will Deacon <will@kernel.org>

parent d11b1877

arch/arm64/kernel/hibernate-asm.S

+2 −1

Original line number	Diff line number	Diff line
		@@ -91,7 +91,8 @@ SYM_CODE_START(swsusp_arch_suspend_exit)
		raw_dcache_line_size x2, x3
		sub x3, x2, #1
		bic x4, x10, x3
		2: dc cvau, x4 /* clean D line / unified line */
		2: /* clean D line / unified line */
		alternative_insn "dc cvau, x4", "dc civac, x4", ARM64_WORKAROUND_CLEAN_CACHE
		add x4, x4, x2
		cmp x4, x1
		b.lo 2b