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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2016-09-09 14:07:10 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-09-09 15:03:28 +0100 |
| commit | c47a1900ad710fd2c97127e2ba19da1df79cf733 (patch) | |
| tree | 280ee1f75639c56aca3f82abd3065f94b740c68f /arch/arm64/kernel/smp.c | |
| parent | 89ba26458b72422e0a1d85eb729a15220b204458 (diff) | |
| download | linux-c47a1900ad710fd2c97127e2ba19da1df79cf733.tar.bz2 | |
arm64: Rearrange CPU errata workaround checks
Right now we run through the work around checks on a CPU
from __cpuinfo_store_cpu. There are some problems with that:
1) We initialise the system wide CPU feature registers only after the
Boot CPU updates its cpuinfo. Now, if a work around depends on the
variance of a CPU ID feature (e.g, check for Cache Line size mismatch),
we have no way of performing it cleanly for the boot CPU.
2) It is out of place, invoked from __cpuinfo_store_cpu() in cpuinfo.c. It
is not an obvious place for that.
This patch rearranges the CPU specific capability(aka work around) checks.
1) At the moment we use verify_local_cpu_capabilities() to check if a new
CPU has all the system advertised features. Use this for the secondary CPUs
to perform the work around check. For that we rename
verify_local_cpu_capabilities() => check_local_cpu_capabilities()
which:
If the system wide capabilities haven't been initialised (i.e, the CPU
is activated at the boot), update the system wide detected work arounds.
Otherwise (i.e a CPU hotplugged in later) verify that this CPU conforms to the
system wide capabilities.
2) Boot CPU updates the work arounds from smp_prepare_boot_cpu() after we have
initialised the system wide CPU feature values.
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/smp.c')
| -rw-r--r-- | arch/arm64/kernel/smp.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 8b048e6ec34a..a8e64095cd69 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -239,7 +239,7 @@ asmlinkage void secondary_start_kernel(void) * this CPU ticks all of those. If it doesn't, the CPU will * fail to come online. */ - verify_local_cpu_capabilities(); + check_local_cpu_capabilities(); if (cpu_ops[cpu]->cpu_postboot) cpu_ops[cpu]->cpu_postboot(); @@ -444,6 +444,12 @@ void __init smp_prepare_boot_cpu(void) jump_label_init(); cpuinfo_store_boot_cpu(); save_boot_cpu_run_el(); + /* + * Run the errata work around checks on the boot CPU, once we have + * initialised the cpu feature infrastructure from + * cpuinfo_store_boot_cpu() above. + */ + update_cpu_errata_workarounds(); } static u64 __init of_get_cpu_mpidr(struct device_node *dn) |