arm64: capabilities: Speed up capability lookup
We maintain two separate tables of capabilities, errata and features, which decide the system capabilities. We iterate over each of these tables for various operations (e.g, detection, verification etc.). We do not have a way to map a system "capability" to its entry, (i.e, cap -> struct arm64_cpu_capabilities) which is needed for this_cpu_has_cap(). So we iterate over the table one by one to find the entry and then do the operation. Also, this prevents us from optimizing the way we "enable" the capabilities on the CPUs, where we now issue a stop_machine() for each available capability. One solution is to merge the two tables into a single table, sorted by the capability. But this is has the following disadvantages: - We loose the "classification" of an errata vs. feature - It is quite easy to make a mistake when adding an entry, unless we sort the table at runtime. So we maintain a list of pointers to the capability entry, sorted by the "cap number" in a separate array, initialized at boot time. The only restriction is that we can have one "entry" per capability. While at it, remove the duplicate declaration of arm64_errata table. Reviewed-by:Vladimir Murzin <vladimir.murzin@arm.com> Tested-by:
Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by:
Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com>
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