Messages in this thread Patch in this message | | | From | Prarit Bhargava <> | Subject | [PATCH] Add additional Intel CPU models to crystal_khz whitelist | Date | Fri, 9 Sep 2016 11:18:03 -0400 |
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In commit aa297292d708 ("x86/tsc: Enumerate SKL cpu_khz and tsc_khz via CPUID"), the kernel added support for Intel processors which had a different CPU base-frequency and TSC frequency.
The turbostat utility has been updated with KBL and SKX processors, and they should also be added to the crystal_khz white list.
For example, on KBL (0x8E) native_calibrate_tsc() returns 0 MHz for tsc_khz and after this patch native_calibrate_tsc() returns 1608 MHz.
Signed-off-by: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org Cc: Rafael Aquini <aquini@redhat.com> Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Len Brown <len.brown@intel.com> Cc: lenb@kernel.org --- arch/x86/kernel/tsc.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 78b9cb5a26af..421ddbbf3fc8 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -688,11 +688,19 @@ unsigned long native_calibrate_tsc(void) switch (boot_cpu_data.x86_model) { case 0x4E: /* SKL */ case 0x5E: /* SKL */ + case 0x8E: /* KBL */ + case 0x9E: /* KBL */ crystal_khz = 24000; /* 24.0 MHz */ break; + case 0x55: /* SKX */ + crystal_khz = 25000; /* 25.0 MHz */ + break; case 0x5C: /* BXT */ crystal_khz = 19200; /* 19.2 MHz */ break; + default: + crystal_khz = 0; + } } -- 1.7.9.3
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