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clocksource/drivers/arm_arch_timer: Control the evtstrm via the cmdline

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Disabling the eventstream can be useful for both remotely debugging a
deployed production system and development of code using WFE-based
polling loops. Whilst this can currently be controlled via a Kconfig
option (CONFIG_ARM_ARCH_TIMER_EVTSTREAM), it's often desirable to toggle
the feature on the command line, so this patch adds a new command-line
option ("clocksource.arm_arch_timer.evtstrm") to do just that. The
default behaviour is determined based on CONFIG_ARM_ARCH_TIMER_EVTSTREAM.

Cc: Marc Zyngier <[email protected]>
Cc: Mark Rutland <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
This commit is contained in:
Will Deacon 2016-06-27 17:30:13 +01:00 • committed by Daniel Lezcano
commit 46fd5c6b30
3 changed files with 24 additions and 6 deletions
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8
Documentation/kernel-parameters.txt
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@ -687,6 +687,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
[SPARC64] tick
[X86-64] hpet,tsc
clocksource.arm_arch_timer.evtstrm=
[ARM,ARM64]
Format: <bool>
Enable/disable the eventstream feature of the ARM
architected timer so that code using WFE-based polling
loops can be debugged more effectively on production
systems.
clearcpuid=BITNUM [X86]
Disable CPUID feature X for the kernel. See
arch/x86/include/asm/cpufeatures.h for the valid bit