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| author | Peter Zijlstra <peterz@infradead.org> | 2017-12-22 12:20:11 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-01-14 22:18:23 +0300 |
| commit | 30c7e5b123673d5e570e238dbada2fb68a87212c (patch) | |
| tree | 2b1ccd53e66e21b0f5f8a6f0afc3a3bf19975513 /arch/x86/include/asm/i8259.h | |
| parent | 4b5b2127238e689ee18aa6752959751dd61c4c73 (diff) | |
| download | linux-30c7e5b123673d5e570e238dbada2fb68a87212c.tar.xz | |
x86/tsc: Allow TSC calibration without PIT
Zhang Rui reported that a Surface Pro 4 will fail to boot with
lapic=notscdeadline. Part of the problem is that that machine doesn't have
a PIT.
If, for some reason, the TSC init has to fall back to TSC calibration, it
relies on the PIT to be present.
Allow TSC calibration to reliably fall back to HPET.
The below results in an accurate TSC measurement when forced on a IVB:
tsc: Unable to calibrate against PIT
tsc: No reference (HPET/PMTIMER) available
tsc: Unable to calibrate against PIT
tsc: using HPET reference calibration
tsc: Detected 2792.451 MHz processor
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: len.brown@intel.com
Cc: rui.zhang@intel.com
Link: https://lkml.kernel.org/r/20171222092243.333145937@infradead.org
Diffstat (limited to 'arch/x86/include/asm/i8259.h')
| -rw-r--r-- | arch/x86/include/asm/i8259.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h index c8376b40e882..5cdcdbd4d892 100644 --- a/arch/x86/include/asm/i8259.h +++ b/arch/x86/include/asm/i8259.h @@ -69,6 +69,11 @@ struct legacy_pic { extern struct legacy_pic *legacy_pic; extern struct legacy_pic null_legacy_pic; +static inline bool has_legacy_pic(void) +{ + return legacy_pic != &null_legacy_pic; +} + static inline int nr_legacy_irqs(void) { return legacy_pic->nr_legacy_irqs; |