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

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Date:	Tue, 30 Sep 2008 15:40:15 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"Zhao\, Yu" <yu.zhao@...el.com>
Cc:	"linux-pci\@vger.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\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm\@vger.kernel.org" <kvm@...r.kernel.org>,
	"virtualization\@lists.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 4/6 v3] PCI: support SR-IOV capability

 > +       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?

 - R.
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