On Wed, Jun 29, 2016 at 10:04 PM, Luck, Tony <tony.luck@xxxxxxxxx> 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: Fu Wei <fu.wei@xxxxxxxxxx> > Tested-by: Tyler Baicar <tbaicar@xxxxxxxxxxxxxx> > Reviewed-by: Borislav Petkov <bp@xxxxxxx> > Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> > --- > > This seems to be the patch that is doomed to be forgotten. The > original by Huang Ying was written so long ago that I don't want > to search that deep into the archives in case I disturb a balrog. > Fu Wei posted it back in January this year and got the Tested-by > and Reviewed-by sign-offs: > > https://lkml.kernel.org/r/1453196042-12273-1-git-send-email-fu.wei@xxxxxxxxxx > > but then it looks like it was forgotten again :-( Do you want me to take it? Thanks, Rafael -- 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
