linux-kernel - Re: [PATCH V3 2/2] acpi: apei: call into AER handling regardless of severity

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Date:   Thu, 9 Nov 2017 10:46:54 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Tyler Baicar <tbaicar@...eaurora.org>
Cc:     rjw@...ysocki.net, tony.luck@...el.com, will.deacon@....com,
        james.morse@....com, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 2/2] acpi: apei: call into AER handling regardless of
 severity

On Wed, Nov 08, 2017 at 12:13:12PM -0700, 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@...eaurora.org>
> ---
>  drivers/acpi/apei/ghes.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 839c3d5..bb65fa6 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -458,14 +458,12 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>  #endif
>  }

Where did the explanatory comment go?

+/*
+ * PCIe AER errors need to be sent to the AER driver for reporting and
+ * recovery. The GHES severities map to the following AER severities and
+ * require the following handling:
+ *
+ * GHES_SEV_CORRECTABLE -> AER_CORRECTABLE
+ *     These need to be reported by the AER driver but no recovery is
+ *     necessary.
+ * GHES_SEV_RECOVERABLE -> AER_NONFATAL
+ * GHES_SEV_RECOVERABLE && CPER_SEC_RESET -> AER_FATAL
+ *     These both need to be reported and recovered from by the AER driver.
+ * GHES_SEV_PANIC does not make it to this handling since the kernel must
+ *     panic.
+ */

<--- ???

> -static void ghes_handle_aer(struct acpi_hest_generic_data *gdata, int sev, int sec_sev)
> +static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
>  {
>  #ifdef CONFIG_ACPI_APEI_PCIEAER
>  	struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
>  
> -	if (sev == GHES_SEV_RECOVERABLE &&
> -	    sec_sev == GHES_SEV_RECOVERABLE &&
> -	    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
> +	if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
>  	    pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
>  		unsigned int devfn;
>  		int aer_severity;
> @@ -519,7 +517,7 @@ static void ghes_do_proc(struct ghes *ghes,
>  			ghes_handle_memory_failure(gdata, sev);
>  		}
>  		else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
> -			ghes_handle_aer(gdata, sev, sec_sev);
> +			ghes_handle_aer(gdata);
>  		}
>  		else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
>  			struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
> -- 

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--