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arm64: capabilities: Split the processing of errata work arounds

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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>
This commit is contained in:
Suzuki K Poulose 2018-03-26 15:12:36 +01:00 committed by Will Deacon
parent 600b9c919c
commit d69fe9a7e7
1 changed files with 4 additions and 2 deletions
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6
arch/arm64/kernel/cpufeature.c
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@ -560,7 +560,7 @@ 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");
}
@ -1452,7 +1452,7 @@ 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();
@ -1480,6 +1480,8 @@ 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();