On Tue, Jan 19, 2016 at 05:34:02PM +0800, fu.wei@xxxxxxxxxx wrote: > From: Huang Ying <ying.huang@xxxxxxxxx> > > ACPI/APEI is designed to verifiy/report H/W errors, like Corrected > Error(CE) and Uncorrected Error(UC). It contains four tables: HEST, > ERST, EINJ and BERT. The first three tables have been merged for > a long time, but because of lacking BIOS support for BERT, the > support for BERT is pending until now. Recently on ARM 64 platform > it is has been supported. So here we come. > > Under normal circumstances, when a hardware error occurs, kernel will > be notified via NMI, MCE or some other method, then kernel will > process the error condition, report it, and recover it if possible. > But sometime, the situation is so bad, so that firmware may choose to > reset directly without notifying Linux kernel. > > Linux kernel can use the Boot Error Record Table (BERT) to get the > un-notified hardware errors that occurred in a previous boot. In this > patch, the error information is reported via printk. > > For more information about BERT, please refer to ACPI Specification > version 6.0, section 18.3.1: > http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf > > The following log is a BERT record after system reboot because of hitting > a fatal memory error: > BERT: Error records from previous boot: > [Hardware Error]: It has been corrected by h/w and requires no further action > [Hardware Error]: event severity: corrected > [Hardware Error]: Error 0, type: recoverable > [Hardware Error]: section_type: memory error > [Hardware Error]: error_status: 0x0000000000000400 > [Hardware Error]: physical_address: 0xffffffffffffffff > [Hardware Error]: card: 1 module: 2 bank: 3 row: 1 column: 2 bit_position: 5 > [Hardware Error]: error_type: 2, single-bit ECC > > [Tomasz Nowicki: Clear error status at the end of error handling] > [Tony: Applied some cleanups suggested by Fu Wei] > [Fu Wei: delete EXPORT_SYMBOL_GPL(bert_disable), improve the code] > > Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx> > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx> > Signed-off-by: Chen, Gong <gong.chen@xxxxxxxxxxxxxxx> > Tested-by: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx> > Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> > Signed-off-by: Fu Wei <fu.wei@xxxxxxxxxx> > Tested-by: Tyler Baicar <tbaicar@xxxxxxxxxxxxxx> > --- > Changelog: > v5: Drop some superfluous comments. > Use the introduce of BERT in ACPI Specification instead of original one > at the head of bert.c. > Fix typo in apei-internal.h > Simplify the introduce of bert_disable. > > v4: https://lkml.org/lkml/2016/1/8/382 > Fix the "#undef" bug > Improve the instruction of "bert_disable", > Delete the useless declaration in include/acpi/apei.h. > > v3: https://lkml.org/lkml/2016/1/7/214 > Merge the two patches > Do some improvements according to Borislav's suggestion. > > v2: https://lkml.org/lkml/2015/8/18/336 > Delete EXPORT_SYMBOL_GPL(bert_disable), because "bert_disable" is only > used in bert.c for now. > Do some code-style cleanups. > > v1: The first upstream version submitted in linux-acpi mailing list: > http://www.spinics.net/lists/linux-acpi/msg57384.html > > Documentation/kernel-parameters.txt | 3 + > drivers/acpi/apei/Makefile | 2 +- > drivers/acpi/apei/apei-internal.h | 2 +- > drivers/acpi/apei/bert.c | 150 ++++++++++++++++++++++++++++++++++++ > 4 files changed, 155 insertions(+), 2 deletions(-) Reviewed-by: Borislav Petkov <bp@xxxxxxx> -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
