Messages in this thread Patch in this message |  | | Subject | Regression: unable to boot after commit bd9240a18edf ("x86/apic: Add TSC_DEADLINE quirk due to errata") - Surface Pro 4 SKL | From | Zhang Rui <> | Date | Tue, 28 Nov 2017 10:08:53 +0800 |
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Hi, All,
My Surface Pro 4 is unable to boot after 4.12. The symptom is that kernel freezes during boot, and the last message in the screen is loading the initrd image. And I have bisected it to this commit
commit bd9240a18edfbfa72e957fc2ba831cf1f13ea073 (refs/bisect/bad) Author: Peter Zijlstra <peterz@infradead.org> AuthorDate: Wed May 31 17:52:03 2017 +0200 Commit: Thomas Gleixner <tglx@linutronix.de> CommitDate: Sun Jun 4 21:55:53 2017 +0200
x86/apic: Add TSC_DEADLINE quirk due to errata Due to errata it is possible for the TSC_DEADLINE timer to misbehave after using TSC_ADJUST. A microcode update is available to fix this situation. Avoid using the TSC_DEADLINE timer if it is affected by this issue and report the required microcode version. [ tglx: Renamed function to apic_check_deadline_errata() ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: kevin.b.stanton@intel.com Link: http://lkml.kernel.org/r/20170531155306.050849877@infradead.o rg Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Currently, I'm using v4.14 kernel with the following workaround on top.
--- arch/x86/kernel/apic/apic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index ff89177..cd419d4 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -596,7 +596,7 @@ static const struct x86_cpu_id deadline_match[] = { DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_BROADWELL_CORE, 0x25), DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_BROADWELL_GT3E, 0x17), - DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_MOBILE, 0xb2), +// DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_MOBILE, 0xb2), DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_DESKTOP, 0xb2), DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_KABYLAKE_MOBILE, 0x52), -- 2.7.4
I'm reading the related code but have not figured out the root cause yet. Anyone suggestions?
thanks, rui
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