On Thu, 2018-03-29 at 15:37 -0700, Dave Jiang wrote:
The following series implements support for parsing of the BERT
and adding the error memory ranges to nvdimm badblocks in order for the
kernel to avoid prevent the kernel from accessing those areas. And with
the addition of this support, we can surface the nd regions instead of waiting
for ARS to complete. So the ARS handling is reworked to run in the
background and not block nd region registration.
I agree on the problem, and adding an ability to obtain pmem badblocks
records at boot-time without waiting for a new ARS scan to complete is a
good option for users.
However, I do not think using the BERT table is a good approach. This
requires FW to report pmem badblocks records with a new interface in
addition to ARS records, which FW already implements for pmem. ACPI 6.2
defines Start ARS with Flags Bit set to report badblocks record
without starting a new ARS scan. We set this bit after receiving a 0x81
notification at this point.
Can we use ARS with Flags bit set at boot-time so that both OS and FW
can use the same ARS implementation?