diff options
| author | Yong Wang <yong.y.wang@linux.intel.com> | 2009-12-16 12:58:46 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-18 14:05:43 -0800 |
| commit | 21fc7b8d8c49b0f6ce7a45ae44361d31e93e629a (patch) | |
| tree | fa2bb71faf5928a92fcedc357e4b4a8bf3b8e82b /arch/x86/include/asm | |
| parent | 2e20f8fadd921fa3d664bb120f99b380a1b05cbd (diff) | |
x86: Under BIOS control, restore AP's APIC_LVTTHMR to the BSP value
Upstream commit a2202aa29289db64ca7988b12343158b67b27f10.
On platforms where bios handles the thermal monitor interrupt,
APIC_LVTTHMR on each logical CPU is programmed to generate a SMI and OS
can't touch it.
Unfortunately AP bringup sequence using INIT-SIPI-SIPI clear all
the LVT entries except the mask bit. Essentially this results in
all LVT entries including the thermal monitoring interrupt set to masked
(clearing the bios programmed value for APIC_LVTTHMR).
And this leads to kernel take over the thermal monitoring interrupt
on AP's but not on BSP (leaving the bios programmed value only on BSP).
As a result of this, we have seen system hangs when the thermal
monitoring interrupt is generated.
Fix this by reading the initial value of thermal LVT entry on BSP
and if bios has taken over the control, then program the same value
on all AP's and leave the thermal monitoring interrupt control
on all the logical cpu's to the bios.
Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Reviewed-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Cc: Arjan van de Ven <arjan@infradead.org>
LKML-Reference: <20091110013824.GA24940@ywang-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/mce.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index f1363b72364f..a47902354261 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -214,5 +214,11 @@ void intel_init_thermal(struct cpuinfo_x86 *c); void mce_log_therm_throt_event(__u64 status); +#ifdef CONFIG_X86_THERMAL_VECTOR +extern void mcheck_intel_therm_init(void); +#else +static inline void mcheck_intel_therm_init(void) { } +#endif + #endif /* __KERNEL__ */ #endif /* _ASM_X86_MCE_H */ |