From: "Ghannam, Yazen" <Yazen.Ghannam@amd.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"tony.luck@intel.com" <tony.luck@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"rafal@milecki.pl" <rafal@milecki.pl>,
"clemej@gmail.com" <clemej@gmail.com>
Subject: Re: [PATCH v2 1/2] x86/MCE: Add function to allow filtering of MCA errors
Date: Fri, 22 Mar 2019 19:05:27 +0000 [thread overview]
Message-ID: <0a3f1341-35ec-a462-1f3f-a1c5cfe6decd@amd.com> (raw)
In-Reply-To: <20190322172405.GJ12472@zn.tnic>
On 3/22/2019 12:24 PM, Borislav Petkov wrote:
> On Thu, Mar 21, 2019 at 08:25:17PM +0000, Ghannam, Yazen wrote:
>> From: Yazen Ghannam <yazen.ghannam@amd.com>
>>
>> Some systems may report spurious MCA errors. In general, spurious MCA
>> errors may be disabled by clearing a particular bit in MCA_CTL. However,
>> clearing a bit in MCA_CTL may not be recommended for some errors, so the
>> only option is to ignore them.
>>
>> An MCA error is printed and handled after it has been added to the MCE
>> event pool. So an MCA error can be ignored by not adding it to the pool.
>>
>> Create a function pointer to filter MCA errors and use this when adding
>> an error to the MCE event pool.
>>
>> Install a default function that does not filter any errors.
>>
>> Cc: <stable@vger.kernel.org> # 4.14.x
>> Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
>> ---
>> Link:
>> https://lkml.kernel.org/r/20190307212552.8865-1-Yazen.Ghannam@amd.com
>>
>> v1->v2:
>> * This is a new patch replacing V1 Patch 1 which is no longer needed.
>>
>> arch/x86/include/asm/mce.h | 3 +++
>> arch/x86/kernel/cpu/mce/core.c | 6 ++++++
>> arch/x86/kernel/cpu/mce/genpool.c | 3 +++
>> 3 files changed, 12 insertions(+)
>>
>> diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
>> index 22d05e3835f0..0b0b797a959c 100644
>> --- a/arch/x86/include/asm/mce.h
>> +++ b/arch/x86/include/asm/mce.h
>> @@ -253,6 +253,9 @@ extern void mce_disable_bank(int bank);
>> extern void (*machine_check_vector)(struct pt_regs *, long error_code);
>> void do_machine_check(struct pt_regs *, long);
>>
>> +/* Filter MCEs from the decoder chain. */
>
> That should be something like:
>
> /* Decides whether to add MCE records to the decoder chain or filter them out. */
>
Okay. I'll make a change.
>> +extern bool (*filter_mce)(struct mce *m);
>> +
>> /*
>> * Threshold handler
>> */
>> diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
>> index b7fb541a4873..effb40581f08 100644
>> --- a/arch/x86/kernel/cpu/mce/core.c
>> +++ b/arch/x86/kernel/cpu/mce/core.c
>> @@ -1771,6 +1771,12 @@ static void __mcheck_cpu_init_timer(void)
>> mce_start_timer(t);
>> }
>>
>> +/*
>> + * Don't filter MCEs by default. Install a system-specific function, if needed.
>> + */
>
> That comment is kinda obvious.
>
Okay. I'll drop it.
Thanks,
Yazen
prev parent reply other threads:[~2019-03-22 19:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 20:25 [PATCH v2 1/2] x86/MCE: Add function to allow filtering of MCA errors Ghannam, Yazen
2019-03-21 20:25 ` [PATCH v2 2/2] x86/MCE/AMD: Don't report L1 BTB MCA errors on some Family 17h models Ghannam, Yazen
2019-03-22 17:34 ` Borislav Petkov
2019-03-22 19:24 ` Ghannam, Yazen
2019-03-22 19:32 ` Borislav Petkov
2019-03-22 19:33 ` Ghannam, Yazen
2019-03-22 17:24 ` [PATCH v2 1/2] x86/MCE: Add function to allow filtering of MCA errors Borislav Petkov
2019-03-22 19:05 ` Ghannam, Yazen [this message]
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