x86/platform/UV: Add check of TSC state set by UV BIOS

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Insert a check early in UV system startup that checks whether BIOS was
able to obtain satisfactory TSC Sync stability.  If not, it usually
is caused by an error in the external TSC clock generation source.
In this case the best fallback is to use the builtin hardware RTC
as the kernel will not be able to set an accurate TSC sync either.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Reviewed-by: Russ Anderson <russ.anderson@hpe.com>
Reviewed-by: Andrew Banman <andrew.abanman@hpe.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Andrew Banman <andrew.banman@hpe.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Bin Gao <bin.gao@linux.intel.com>
Link: https://lkml.kernel.org/r/20171012163202.406294490@stormcage.americas.sgi.com

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mike.travis@hpe.com 2017-10-12 11:32:06 -05:00 • committed by Thomas Gleixner

parent 6c66350d0a

commit 97d21003df

2 changed files with 61 additions and 5 deletions

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23

arch/x86/include/asm/uv/uv_hub.h

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43

arch/x86/kernel/apic/x2apic_uv_x.c

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