[PATCH for-stable-4.14 18/48] arm64: capabilities: Split the processing of errata work arounds

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

From: Suzuki K Poulose <suzuki.poulose@arm.com>

[ Upstream commit d69fe9a7e7214d49fe157ec20889892388d0fe23 ]

Right now we run through the errata workarounds check on all boot
active CPUs, with SCOPE_ALL. This wouldn't help for detecting erratum
workarounds with a SYSTEM_SCOPE. There are none yet, but we plan to
introduce some: let us clean this up so that such workarounds can be
detected and enabled correctly.

So, we run the checks with SCOPE_LOCAL_CPU on all CPUs and SCOPE_SYSTEM
checks are run only once after all the boot time CPUs are active.

Reviewed-by: Dave Martin <dave.martin@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 arch/arm64/kernel/cpufeature.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index bc76597abe7b..291f8899b37f 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -529,7 +529,7 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
 	 * Run the errata work around checks on the boot CPU, once we have
 	 * initialised the cpu feature infrastructure.
 	 */
-	update_cpu_capabilities(arm64_errata, SCOPE_ALL,
+	update_cpu_capabilities(arm64_errata, SCOPE_LOCAL_CPU,
 				"enabling workaround for");
 }
 
@@ -1354,7 +1354,7 @@ void check_local_cpu_capabilities(void)
 	 * advertised capabilities.
 	 */
 	if (!sys_caps_initialised)
-		update_cpu_capabilities(arm64_errata, SCOPE_ALL,
+		update_cpu_capabilities(arm64_errata, SCOPE_LOCAL_CPU,
 					"enabling workaround for");
 	else
 		verify_local_cpu_capabilities();
@@ -1383,6 +1383,8 @@ void __init setup_cpu_features(void)
 
 	/* Set the CPU feature capabilies */
 	update_cpu_capabilities(arm64_features, SCOPE_ALL, "detected:");
+	update_cpu_capabilities(arm64_errata, SCOPE_SYSTEM,
+				"enabling workaround for");
 	enable_cpu_capabilities(arm64_features, SCOPE_ALL);
 	enable_cpu_capabilities(arm64_errata, SCOPE_ALL);
 	mark_const_caps_ready();
-- 
2.20.1