linux-kernel - Re: mce_64.c: mce_cpu

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Message-ID: <20080625001256.GA31734@linux-os.sc.intel.com>
Date:	Tue, 24 Jun 2008 17:12:56 -0700
From:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Max Asbock <masbock@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: mce_64.c: mce_cpu_quirks being ignored

On Thu, Jun 19, 2008 at 02:16:17PM -0700, Andi Kleen wrote:
> Max Asbock wrote:
> 
> 
> 
> > static void __cpuinit mce_cpu_quirks(struct cpuinfo_x86 *c)
> > {
> >         /* This should be disabled by the BIOS, but isn't always */
> >         if (c->x86_vendor == X86_VENDOR_AMD) {
> >                 if(c->x86 == 15)
> >                         /* disable GART TBL walk error reporting, which trips off
> >                            incorrectly with the IOMMU & 3ware & Cerberus. */
> >                         clear_bit(10, &bank[4]);
> > ....
> >
> > Is turning off that bit still needed?
> 
> Yes it is. Also referencing the bank is needed for other reasons anyways,
> otherwise it would ignore the user sysfs choice on reconfiguration.
> 
> Venki, I did a patch for dynamic banks anyways, but haven't submitted it yet.
> 

Yes. That particular quirk getting ignored was a bug. Below patch fixes
the bug, until we have the dynamic banks support.

sysfs choice configuration should not have any issues with the earlier patch
as we look for NR_SYSFS_BANKS in do_machine_check().

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>

---
 arch/x86/kernel/cpu/mcheck/mce_64.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/mcheck/mce_64.c	2008-06-24 16:01:23.000000000 -0700
+++ linux-2.6/arch/x86/kernel/cpu/mcheck/mce_64.c	2008-06-24 16:48:01.000000000 -0700
@@ -463,7 +463,11 @@ static void mce_init(void *dummy)
 		wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
 
 	for (i = 0; i < banks; i++) {
-		wrmsrl(MSR_IA32_MC0_CTL+4*i, ~0UL);
+		if (i < NR_SYSFS_BANKS)
+			wrmsrl(MSR_IA32_MC0_CTL+4*i, bank[i]);
+		else
+			wrmsrl(MSR_IA32_MC0_CTL+4*i, ~0UL);
+
 		wrmsrl(MSR_IA32_MC0_STATUS+4*i, 0);
 	}
 }
--
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