[PATCH V15 08/11] efi: print unrecognized CPER section

Borislav Petkov
2017-05-05T13:27:17Z

On Tue, Apr 18, 2017 at 05:05:20PM -0600, Tyler Baicar wrote:
> UEFI spec allows for non-standard section in Common Platform Error
> Record. This is defined in section N.2.3 of UEFI version 2.5.
>
> Currently if the CPER section's type (UUID) does not match with
> one of the section types that the kernel knows how to parse, the
> section is skipped. Therefore, user is not able to see
> such CPER data, for instance, error record of non-standard section.
>
> For above mentioned case, this change prints out the raw data in
> hex in dmesg buffer.

... because? We'd need the reason why we're not ignoring those errors
anymore.

> Data length is taken from Error Data length
> field of Generic Error Data Entry.
>
> The following is a sample output from dmesg:
> [ 140.739180] {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 2
> [ 140.739182] {1}[Hardware Error]: It has been corrected by h/w and requires no further action
> [ 140.739191] {1}[Hardware Error]: event severity: corrected
> [ 140.739196] {1}[Hardware Error]: time: precise 2017-03-15 20:37:35
> [ 140.739197] {1}[Hardware Error]: Error 0, type: corrected
> [ 140.739203] {1}[Hardware Error]: section type: unknown, d2e2621c-f936-468d-0d84-15a4ed015c8b
> [ 140.739205] {1}[Hardware Error]: section length: 568 (0x238)
> [ 140.739210] {1}[Hardware Error]: 00000000: 4d415201 4d492031 453a4d45 435f4343 .RAM1 IMEM:ECC_C
> [ 140.739214] {1}[Hardware Error]: 00000010: 53515f45 44525f42 00000000 00000000 E_QSB_RD........
> [ 140.739217] {1}[Hardware Error]: 00000020: 00000000 00000000 00000000 00000000 ................
> [ 140.739220] {1}[Hardware Error]: 00000030: 00000000 00000000 01010000 01010000 ................
> [ 140.739223] {1}[Hardware Error]: 00000040: 00000000 00000000 00000005 00000000 ................
> [ 140.739226] {1}[Hardware Error]: 00000050: 01010000 00000000 00000001 00dddd00 ................

Kill all those prefixes:

" Hardware error from APEI Generic Hardware Error Source: 2
It has been corrected by h/w and requires no further action
event severity: corrected
time: precise 2017-03-15 20:37:35
Error 0, type: corrected
section type: unknown, d2e2621c-f936-468d-0d84-15a4ed015c8b
section length: 568 (0x238)
00000000: 4d415201 4d492031 453a4d45 435f4343 .RAM1 IMEM:ECC_C
00000010: 53515f45 44525f42 00000000 00000000 E_QSB_RD........
00000020: 00000000 00000000 00000000 00000000 ................
00000030: 00000000 00000000 01010000 01010000 ................
00000040: 00000000 00000000 00000005 00000000 ................
00000050: 01010000 00000000 00000001 00dddd00 ................
"

to the important info only.

> ...
>
> The raw data from the error can then be decoded using vendor
> specific tools.
>
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> ---
> drivers/firmware/efi/cper.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index f959185..610d31a 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -596,8 +596,16 @@ static void cper_estatus_timestamp(const char *pfx,
> cper_print_proc_arm(newpfx, arm_err);
> else
> goto err_section_too_small;
> - } else
> - printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
> + } else {
> + const void *unknown_err;
> +
> + unknown_err = acpi_hest_get_payload(gdata);

Simply:

const void *err = acpi_hest_get_payload(gdata);

Short and sweet.

> + printk("%ssection type: unknown, %pUl\n", newpfx, sec_type);
> + printk("%ssection length: %d (%#x)\n", newpfx,

One number format is fine.

--
Regards/Gruss,
Boris.

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