RE: [PATCH v1 0/2] fpga: dfl: Log and clear errors on driver init

[Wu, Hao]

> On 10/19/21 9:44 PM, Wu, Hao wrote:
> >> Subject: [PATCH v1 0/2] fpga: dfl: Log and clear errors on driver init
> >>
> >> These patches address a request to log and clear any prexisting errors on
> >> FPGA cards when the drivers load. Any existing errors will result in print
> >> statements to the kernel error log before the errors are cleared. These
> >> changes specifically affect the fme and port error registers.
> > Could you please explain more about why we need this change?
> > As we have user interface to log and clear errors already, is it a better choice
> > to let userspace log and clear them during AFU initialization?
> In the new architecture we are offering more flexibility to customers
> for adding functions. With these designs it becomes nearly impossible
> to design the AFU interface handler to recover from errors and resume
> operation afterwards. The proposed solution is to flag the source of
> the error and then capture it in sticky registers so that they can be
> read out from SW in the event of a crash/warm boot. To ensure that we
> capture these errors, the proposal is to log them in the kernel log and
> clear them at driver initialization.

The error can be logged and cleared at user space driver initialization,
as current usage model is let userspace handle everything including error.

Hao

> 
> - Russ
> 
> > Hao
> >
> >> Russ Weight (2):
> >>   fpga: dfl: afu: Clear port errors in afu init
> >>   fpga: dfl: fme: Clear fme global errors at driver init
> >>
> >>  drivers/fpga/dfl-afu-error.c |  26 ++++---
> >>  drivers/fpga/dfl-fme-error.c | 128 +++++++++++++++++++++++------------
> >>  2 files changed, 100 insertions(+), 54 deletions(-)
> >>
> >> --
> >> 2.25.1