[Query]: PCIe Root Port Error Recovery

[Query]: PCIe Root Port Error Recovery

[Yicong Yang]

hello,

I found that the root port itself is not handled in pcie_do_recovery() function
and I noticed the commit(bfcb79f) in reset_link(), err.c writes:
"If a Downstream Port (including a Root Port) reports an error, we assume the Port itself is reliable and we need to
reset its downstream link"

Is it real that the root port is always reliable and
How to recover the root ports if it do meet some errors?

Many thanks,
Yang

Re: [Query]: PCIe Root Port Error Recovery

[Keith Busch]

On Mon, Nov 11, 2019 at 11:31:59AM +0800, Yicong Yang wrote:
> hello,
> 
> I found that the root port itself is not handled in pcie_do_recovery() function
> and I noticed the commit(bfcb79f) in reset_link(), err.c writes:
> "If a Downstream Port (including a Root Port) reports an error, we assume the Port itself is reliable and we need to
> reset its downstream link"
> 
> Is it real that the root port is always reliable and
> How to recover the root ports if it do meet some errors?

It's only that the path to the port is considered accessible, nothing
more. The port managed to send a notification that the CPU received,
so we assume communication goes both ways.