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authorYong Wang <yong.y.wang@linux.intel.com>2009-11-10 09:38:24 +0800
committerIngo Molnar <mingo@elte.hu>2009-11-10 05:57:55 +0100
commita2202aa29289db64ca7988b12343158b67b27f10 (patch)
treee84a34b587b07243b3d3557795f8e3fa03302fee /arch/x86/kernel/setup.c
parentb33a6363649f0ff83ec81597ea7fe7e688f973cb (diff)
downloadop-kernel-dev-a2202aa29289db64ca7988b12343158b67b27f10.zip
op-kernel-dev-a2202aa29289db64ca7988b12343158b67b27f10.tar.gz
x86: Under BIOS control, restore AP's APIC_LVTTHMR to the BSP value
On platforms where the BIOS handles the thermal monitor interrupt, APIC_LVTTHMR on each logical CPU is programmed to generate a SMI and OS must not touch it. Unfortunately AP bringup sequence using INIT-SIPI-SIPI clears 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> Cc: stable@kernel.org
Diffstat (limited to 'arch/x86/kernel/setup.c')
-rw-r--r--arch/x86/kernel/setup.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index e09f0e2..179c1f2 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -109,6 +109,7 @@
#ifdef CONFIG_X86_64
#include <asm/numa_64.h>
#endif
+#include <asm/mce.h>
/*
* end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
@@ -1024,6 +1025,8 @@ void __init setup_arch(char **cmdline_p)
#endif
#endif
x86_init.oem.banner();
+
+ mcheck_init();
}
#ifdef CONFIG_X86_32
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