linux-kernel - Re: [PATCH 1/2] ACPI: extlog: Trace CPER Non-standard Section Body

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Message-ID: <20240806210733.GA78095@bhelgaas>
Date: Tue, 6 Aug 2024 16:07:33 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
	Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
	Oliver O'Halloran <oohall@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-pci@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 1/2] ACPI: extlog: Trace CPER Non-standard Section Body

On Mon, May 27, 2024 at 04:43:40PM +0200, Fabio M. De Francesco wrote:
> In extlog_print(), trace "Non-standard Section Body" reported by firmware
> to the OS via Common Platform Error Record (CPER) (UEFI v2.10 Appendix N
> 2.3) to add further debug information and so to make ELOG log
> consistently with ghes_do_proc() (GHES).
> 
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@...ux.intel.com>
> ---
>  drivers/acpi/acpi_extlog.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
> index f055609d4b64..e025ae390737 100644
> --- a/drivers/acpi/acpi_extlog.c
> +++ b/drivers/acpi/acpi_extlog.c
> @@ -179,6 +179,12 @@ static int extlog_print(struct notifier_block *nb, unsigned long val,
>  			if (gdata->error_data_length >= sizeof(*mem))
>  				trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
>  						       (u8)gdata->error_severity);
> +		} else {
> +			void *err = acpi_hest_get_payload(gdata);
> +
> +			trace_non_standard_event(sec_type, fru_id, fru_text,
> +						 gdata->error_severity, err,
> +						 gdata->error_data_length);

Kudos for making these two paths more similar.

Not specific to *this* patch, but it's annoying to try to find
tracepoint implementations.  I guess it's
TRACE_EVENT(non_standard_event, ...) in include/ras/ras_event.h.

This has the same prototype as log_non_standard_event(), so
could extlog_print() be made a little bit more like ghes_do_proc() by
using log_non_standard_event() instead of trace_non_standard_event()
directly?

Bjorn