linux-kernel - Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi

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Message-ID: <20120821084007.GL2582@amd.com>
Date:	Tue, 21 Aug 2012 10:40:07 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
CC:	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<joro@...tes.org>, Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg
 call-back

On Mon, Aug 20, 2012 at 10:08:44AM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > This call-back points to the right function for initializing
> > the msi_msg structure.
> 
> What is the 'hpet_id' purpose in this?

The VT-d implementation uses it. This function is used to create the MSI
message for PCI devices and the HPET. When it is called for the HPET the
pdev parameter is NULL and hpet_id is valid.


	Joerg

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