Re: [PATCH v4 00/17] clocksource/arm_arch_timer: Add basic ARMv8.6 support

Will Deacon
2021-10-19T12:21:06Z

On Sun, 17 Oct 2021 13:42:08 +0100, Marc Zyngier wrote:
> This is v4 (final?) of the series enabling ARMv8.6 support for timer
> subsystem, and was prompted by a discussion with Oliver around the
> fact that an ARMv8.6 implementation must have a 1GHz counter, which
> leads to a number of things to break in the timer code:
>
> - the counter rollover can come pretty quickly as we only advertise a
> 56bit counter,
> - the maximum timer delta can be remarkably small, as we use the
> countdown interface which is limited to 32bit...
>
> [...]

Applied 14-17 to arm64 (for-next/8.6-timers), thanks!

[14/17] arm64: Add a capability for FEAT_ECV
https://git.kernel.org/arm64/c/fdf865988b5a
[15/17] arm64: Add CNT{P,V}CTSS_EL0 alternatives to cnt{p,v}ct_el0
https://git.kernel.org/arm64/c/9ee840a96042
[16/17] arm64: Add handling of CNTVCTSS traps
https://git.kernel.org/arm64/c/ae976f063b60
[17/17] arm64: Add HWCAP for self-synchronising virtual counter
https://git.kernel.org/arm64/c/fee29f008aa3

Cheers,
--
Will