[PATCH 0/1] nvme: Export CSTS register via sysfs

[Alan Adamson]

> On May 5, 2021, at 1:11 PM, Keith Busch <kbusch at kernel.org> wrote:
> 
> On Wed, May 05, 2021 at 06:40:54PM +0000, Alan Adamson wrote:
>> Need to revisit this issue again.  In the original case we needed to
>> get access to the csts register. We were able to move to using the
>> ’state’ sysfs attribute.
>> 
>> We are now getting a similar request from our manufacturing team. They
>> are using nvme-cli show-regs to assist debug. The ’state’ attribute is
>> not sufficient and they want to use the production version of the
>> kernel (which enables CONFIG_IO_STRICT_DEVMEM) rather than a special
>> kernel. Ideally, we would want nvme-cli show-regs to work whether or
>> not CONFIG_IO_STRICT_DEVMEM is configured. Other than exporting the
>> registers thru sysfs attributes, is there any other mechanism to get
>> show-regs the data it needs?
> 
> Append kernel parameter "iomem=relaxed”.

That requires the OS disk to be modified.  We would rather not do that.

Alan