From: "Baicar, Tyler" <tbaicar@codeaurora.org>
To: Borislav Petkov <bp@suse.de>
Cc: rjw@rjwysocki.net, lenb@kernel.org, will.deacon@arm.com,
james.morse@arm.com, prarit@redhat.com, punit.agrawal@arm.com,
shiju.jose@huawei.com, andriy.shevchenko@linux.intel.com,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] acpi: apei: call into AER handling regardless of severity
Date: Tue, 29 Aug 2017 15:27:42 -0600 [thread overview]
Message-ID: <9abb2e99-44be-3315-47d9-2689b6c76d79@codeaurora.org> (raw)
In-Reply-To: <20170829082055.u3qpwtgyzxjxfvup@pd.tnic>
On 8/29/2017 2:20 AM, Borislav Petkov wrote:
> On Mon, Aug 28, 2017 at 11:11:54AM -0600, Tyler Baicar wrote:
>> Currently the GHES code only calls into the AER driver for
>> recoverable type errors. This is incorrect because errors of
>> other severities do not get logged by the AER driver and do not
>> get exposed to user space via the AER trace event. So, call
>> into the AER driver for PCIe errors regardless of the severity.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> ---
>> drivers/acpi/apei/ghes.c | 4 +---
>> 1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index d661d45..5cab238 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -489,9 +489,7 @@ static void ghes_do_proc(struct ghes *ghes,
>> else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
>> struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
>>
>> - if (sev == GHES_SEV_RECOVERABLE &&
>> - sec_sev == GHES_SEV_RECOVERABLE &&
> Did you make the effort to see which commit added those lines and read
> its commit message?
>
> Doesn't look like it...
Hello Boris,
Here is that commit text:
"ACPI, APEI, GHES: Add PCIe AER recovery support
aer_recover_queue() is called when recoverable PCIe AER errors are
notified by firmware to do the recovery work."
The function with the real bulk of the code we need here is
aer_recover_work_func() which calls into cper_print_aer() and
do_recovery(). The do_recovery() function is the only function that
should be specific to recoverable errors. We need cper_print_aer() to
handle printing of AER specific information and to trigger the aer_event
to notify user space. Otherwise tools such as RAS Daemon will not be
notified of correctable type PCIe errors. You can clearly see by looking
at cper_print_aer() that it expects to be called with correctable errors
as well. To avoid calling the do_recovery() function for correctable
errors I created https://patchwork.kernel.org/patch/9925877/
The AER core framework for non-FF systems prints all the AER error
information for all errors and then only calls do_recovery() for
non-correctable errors. See aer_process_err_devices() and
handle_error_source().
Thanks,
Tyler
--
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.
next prev parent reply other threads:[~2017-08-29 21:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-28 17:11 [PATCH] acpi: apei: call into AER handling regardless of severity Tyler Baicar
2017-08-28 20:52 ` Rafael J. Wysocki
2017-08-29 8:20 ` Borislav Petkov
2017-08-29 21:27 ` Baicar, Tyler [this message]
2017-08-29 22:19 ` Borislav Petkov
2017-08-29 22:34 ` Sinan Kaya
2017-08-30 10:16 ` Borislav Petkov
2017-08-30 14:05 ` Sinan Kaya
2017-08-30 15:16 ` Borislav Petkov
2017-08-30 15:31 ` Sinan Kaya
2017-08-30 15:42 ` Baicar, Tyler
2017-08-30 17:14 ` Borislav Petkov
2017-08-30 18:09 ` Baicar, Tyler
2017-08-30 17:02 ` Borislav Petkov
2017-08-29 23:06 ` Luck, Tony
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