linux-kernel - RE: [PATCH 4/6 v3] PCI: support SR-IOV capability

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Date:	Wed, 8 Oct 2008 10:49:27 +0800
From:	"Zhao, Yu" <yu.zhao@...el.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Grant Grundler <grundler@...isc-linux.org>,
	Alex Chiang <achiang@...com>, Matthew Wilcox <matthew@....cx>,
	Greg KH <greg@...ah.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: RE: [PATCH 4/6 v3] PCI: support SR-IOV capability

On Wednesday, October 01, 2008 6:40 AM, Roland Dreier wrote:
> > +       ctrl = pci_ari_enabled(dev) ? PCI_IOV_CTRL_ARI : 0;
> > +       pci_write_config_word(dev, pos + PCI_IOV_CTRL, ctrl);
> > +       ssleep(1);
>
>You seem to sleep for 1 second wherever you write the IOV_CTRL
>register.  Why is this?  Is this specified by PCI, or is it coming from
>somewhere else?

This is specified by on pp. 39 PCI SR-IOV specification 1.0. You can find it at: http://www.pcisig.com/members/downloads/specifications/iov/sr-iov1.0_11Sep07.pdf

Thanks.

>
> - R.
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