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[1/4] arm64: barrier: Restore spec_bar() macro

Message ID 20240508081400.235362-2-mark.rutland@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: errata: Add workaround for Arm errata 3194386 and 3312417 | expand

Commit Message

Mark Rutland May 8, 2024, 8:13 a.m. UTC 
Upcoming errata workarounds will need to use SB from C code. Restore the
spec_bar() macro so that we can use SB.

This is effectively a revert of commit:

  4f30ba1cce36d413 ("arm64: barrier: Remove spec_bar() macro")

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
---
 arch/arm64/include/asm/barrier.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index cf2987464c186..1ca947d5c9396 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -40,6 +40,10 @@ 
  */
 #define dgh()		asm volatile("hint #6" : : : "memory")
 
+#define spec_bar()	asm volatile(ALTERNATIVE("dsb nsh\nisb\n",		\
+						 SB_BARRIER_INSN"nop\n",	\
+						 ARM64_HAS_SB))
+
 #ifdef CONFIG_ARM64_PSEUDO_NMI
 #define pmr_sync()						\
 	do {							\