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arm64: Run enable method for errata work arounds on late CPUs

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Commit 55b35d070c upstream.

When a CPU is brought up after we have finalised the system
wide capabilities (i.e, features and errata), we make sure the
new CPU doesn't need a new errata work around which has not been
detected already. However we don't run enable() method on the new
CPU for the errata work arounds already detected. This could
cause the new CPU running without potential work arounds.
It is upto the "enable()" method to decide if this CPU should
do something about the errata.

Fixes: commit 6a6efbb45b ("arm64: Verify CPU errata work arounds on hotplugged CPU")
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Dave Martin <dave.martin@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose
2018-01-17 17:42:20 +00:00
committed by Greg Kroah-Hartman
parent da1f67921d
commit 9da836a476
1 changed files with 6 additions and 3 deletions
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9
arch/arm64/kernel/cpu_errata.c
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@@ -221,15 +221,18 @@ void verify_local_cpu_errata_workarounds(void)
{
const struct arm64_cpu_capabilities *caps = arm64_errata;
for (; caps->matches; caps++)
if (!cpus_have_cap(caps->capability) &&
caps->matches(caps, SCOPE_LOCAL_CPU)) {
for (; caps->matches; caps++) {
if (cpus_have_cap(caps->capability)) {
if (caps->enable)
caps->enable((void *)caps);
} else if (caps->matches(caps, SCOPE_LOCAL_CPU)) {
pr_crit("CPU%d: Requires work around for %s, not detected"
" at boot time\n",
smp_processor_id(),
caps->desc ? : "an erratum");
cpu_die_early();
}
}
}
void update_cpu_errata_workarounds(void)