linux-kernel - Re: [RFC v4 07/14] msi: Add a new MSI_FLAG_IRQ

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Message-ID: <alpine.DEB.2.11.1602261904500.3638@nanos>
Date:	Fri, 26 Feb 2016 19:06:08 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Eric Auger <eric.auger@...aro.org>
cc:	eric.auger@...com, robin.murphy@....com,
	alex.williamson@...hat.com, will.deacon@....com, joro@...tes.org,
	jason@...edaemon.net, marc.zyngier@....com,
	christoffer.dall@...aro.org, linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
	suravee.suthikulpanit@....com, patches@...aro.org,
	linux-kernel@...r.kernel.org, Manish.Jaggi@...iumnetworks.com,
	Bharat.Bhushan@...escale.com, pranav.sawargaonkar@...il.com,
	p.fedin@...sung.com, iommu@...ts.linux-foundation.org
Subject: Re: [RFC v4 07/14] msi: Add a new MSI_FLAG_IRQ_REMAPPING flag

On Fri, 26 Feb 2016, Eric Auger wrote:

> Let's introduce a new msi_domain_info flag value, MSI_FLAG_IRQ_REMAPPING
> meant to tell the domain supports IRQ REMAPPING, also known as Interrupt
> Translation Service. On Intel HW this capability is abstracted on IOMMU
> side while on ARM it is abstracted on MSI controller side.
> 
> GICv3 ITS HW is the first HW advertising that feature.

No. We add the flag, epxlain what it does and then in a second step add the
user _after_ all other preliminaries are implemented.
 
Thanks,

	tglx