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arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs

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It can be useful for JIT software to be aware of MIDR_EL1 and
REVIDR_EL1 to ascertain the presence of any core errata that could
affect code generation.

This patch exposes these registers through sysfs:

/sys/devices/system/cpu/cpu$ID/regs/identification/midr_el1
/sys/devices/system/cpu/cpu$ID/regs/identification/revidr_el1

where $ID is the cpu number. For big.LITTLE systems, one can have a
mixture of cores (e.g. Cortex A53 and Cortex A57), thus all CPUs need
to be enumerated.

If the kernel does not have valid information to populate these entries
with, an empty string is returned to userspace.

Cc: Mark Rutland <[email protected]>
Reviewed-by: Will Deacon <[email protected]>
Signed-off-by: Steve Capper <[email protected]>
[[email protected]: ABI documentation updates, hotplug notifiers, kobject changes]
Signed-off-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Steve Capper 2016-07-08 16:01:13 +01:00 • committed by Catalin Marinas
commit f8d9f92452
3 changed files with 132 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-devices-system-cpu
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@ -340,3 +340,13 @@ Description: POWERNV CPUFreq driver's frequency throttle stats directory and
'policyX/throttle_stats' directory and all the attributes are same as
the /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats directory and
attributes which give the frequency throttle information of the chip.
What: /sys/devices/system/cpu/cpuX/regs/
/sys/devices/system/cpu/cpuX/regs/identification/
/sys/devices/system/cpu/cpuX/regs/identification/midr_el1
/sys/devices/system/cpu/cpuX/regs/identification/revidr_el1
Date: June 2016
Contact: Linux ARM Kernel Mailing list <[email protected]>
Description: AArch64 CPU registers
'identification' directory exposes the CPU ID registers for
identifying model and revision of the CPU.