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author[email protected] <[email protected]>2017-10-12 11:32:06 -0500
committerThomas Gleixner <[email protected]>2017-10-16 22:50:37 +0200
commit97d21003df3e7504c899b1701546f18ff475966f (patch)
tree1bd10a532ea407916df6a73033a686451c6e2b81 /tools/perf/scripts/python
parent6c66350d0a482892793b888b07c1177fc6d4b344 (diff)
x86/platform/UV: Add check of TSC state set by UV BIOS
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 <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Dimitri Sivanich <[email protected]> Reviewed-by: Russ Anderson <[email protected]> Reviewed-by: Andrew Banman <[email protected]> Cc: Prarit Bhargava <[email protected]> Cc: Andrew Banman <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Bin Gao <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
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