From: Bjorn Helgaas <helgaas@kernel.org>
To: Manish Raturi <raturi.manish@gmail.com>
Cc: linux-pci@vger.kernel.org
Subject: Re: Dump of registers during endpoint link down
Date: Thu, 9 Jul 2020 14:24:55 -0500 [thread overview]
Message-ID: <20200709192455.GA12154@bjorn-Precision-5520> (raw)
In-Reply-To: <CAHn-FMy0i=c6jj_yvtQXrKMU5T8F+2AUd79qUw7U98vs9U35hA@mail.gmail.com>
On Thu, Jul 09, 2020 at 12:44:24PM +0530, Manish Raturi wrote:
> Hi Team,
>
> I have a generic query , if an hotplug pcie endpoint connected to the
> CPU root port shows link down, then from the debugging perspective
> w.r.t PCIE what all register can be dump during the failure condition,
> what I can think of is these registers from the root port side
>
> 1) Link status /control/capability
> 2) Slot status /control/capability
> 3) Lane error status registers.
>
> Anything else we can dump which gives us more insight into the issue.
> Also is there anything by which we can check from PCIE clock
> perspective.
If you have this:
Root Port ----- Endpoint
and the Link is down, you won't be able to read any registers from the
Endpoint. You can dump all the Root Port registers, of course, e.g.,
with "lspci -vvvxxxx".
next prev parent reply other threads:[~2020-07-09 19:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-09 7:14 Dump of registers during endpoint link down Manish Raturi
2020-07-09 19:24 ` Bjorn Helgaas [this message]
[not found] <CAHn-FMxBZdHPYQkorePnyK+aY_3S29xVnkjj2u3pWDHjTyyGmA@mail.gmail.com>
2020-07-13 23:44 ` Bjorn Helgaas
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