From: "Pali Rohár" <pali@kernel.org>
To: "Maciej W. Rozycki" <macro@orcam.me.uk>
Cc: David Laight <David.Laight@ACULAB.COM>,
'Amey Narkhede' <ameynarkhede03@gmail.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"helgaas@kernel.org" <helgaas@kernel.org>,
"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
"kabel@kernel.org" <kabel@kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"raphael.norwitz@nutanix.com" <raphael.norwitz@nutanix.com>
Subject: Re: How long should be PCIe card in Warm Reset state?
Date: Tue, 30 Mar 2021 17:04:58 +0200 [thread overview]
Message-ID: <20210330150458.gzz44gczhraxc6bc@pali> (raw)
In-Reply-To: <alpine.DEB.2.21.2103301628180.18977@angie.orcam.me.uk>
On Tuesday 30 March 2021 16:34:47 Maciej W. Rozycki wrote:
> On Tue, 30 Mar 2021, Pali Rohár wrote:
>
> > > If I were to implement this stuff, for good measure I'd give it a safety
> > > margin beyond what the spec requires and use a timeout of say 2-4s while
> > > actively querying the status of the device. The values given in the spec
> > > are only the minimum requirements.
> >
> > Are you able to also figure out what is the minimal timeout value for
> > PCIe Warm Reset?
> >
> > Because we are having troubles to "decode" correct minimal timeout value
> > for this PCIe Warm Reset (not Function-level reset).
>
> The spec does not give any exceptions AFAICT as to the timeouts required
> between the three kinds of a Conventional Reset (Hot, Warm, or Cold) and
> refers to them collectively as a Conventional Reset across the relevant
> parts of the document, so clearly the same rules apply.
>
> Maciej
There are specified more timeouts related to Warm reset and PERST#
signal. Just they are not in Base spec, but in CEM spec. See previous
Amey's email where are described some timeouts and also links in my
first email where I put other timeouts defined in specs relevant for
PERST# signal and therefore also for Warm Reset.
next prev parent reply other threads:[~2021-03-30 15:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 11:05 How long should be PCIe card in Warm Reset state? Pali Rohár
2021-03-23 16:19 ` Amey Narkhede
2021-03-23 16:27 ` Pali Rohár
2021-03-23 16:57 ` Amey Narkhede
2021-03-25 9:18 ` David Laight
2021-03-30 13:04 ` Maciej W. Rozycki
2021-03-30 13:10 ` Pali Rohár
2021-03-30 14:34 ` Maciej W. Rozycki
2021-03-30 15:04 ` Pali Rohár [this message]
2021-03-30 15:22 ` Maciej W. Rozycki
2021-04-25 15:39 ` Pali Rohár
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210330150458.gzz44gczhraxc6bc@pali \
--to=pali@kernel.org \
--cc=David.Laight@ACULAB.COM \
--cc=alex.williamson@redhat.com \
--cc=ameynarkhede03@gmail.com \
--cc=helgaas@kernel.org \
--cc=kabel@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=macro@orcam.me.uk \
--cc=raphael.norwitz@nutanix.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.