Commit 4ca4df0b authored Nov 15, 2016 by Bin Gao Committed by Thomas Gleixner Nov 18, 2016

x86/tsc: Mark TSC frequency determined by CPUID as known



CPUs/SoCs with CPUID leaf 0x15 come with a known frequency and will report
the frequency to software via CPUID instruction. This hardware provided
frequency is the "real" frequency of TSC.

Set the X86_FEATURE_TSC_KNOWN_FREQ flag for such systems to skip the
software calibration process.

A 24 hours test on one of the CPUID 0x15 capable platforms was
conducted. PIT calibrated frequency resulted in more than 3 seconds drift
whereas the CPUID determined frequency showed less than 0.5 second
drift.

Signed-off-by: Bin Gao <bin.gao@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1479241644-234277-3-git-send-email-bin.gao@linux.intel.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 47c95a46

arch/x86/kernel/tsc.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -702,6 +702,13 @@ unsigned long native_calibrate_tsc(void)
		}
		}

		/*
		* TSC frequency determined by CPUID is a "hardware reported"
		* frequency and is the most accurate one so far we have. This
		* is considered a known frequency.
		*/
		setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);

		return crystal_khz * ebx_numerator / eax_denominator;
		}