linux-kernel - Re: [PATCH v6 01/18] iommu/dma: Allow MSI-only cookies

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Message-ID: <20170106105945.GK17255@8bytes.org>
Date:   Fri, 6 Jan 2017 11:59:45 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, christoffer.dall@...aro.org,
        marc.zyngier@....com, robin.murphy@....com,
        alex.williamson@...hat.com, will.deacon@....com,
        tglx@...utronix.de, jason@...edaemon.net,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        drjones@...hat.com, linux-kernel@...r.kernel.org,
        pranav.sawargaonkar@...il.com, iommu@...ts.linux-foundation.org,
        punit.agrawal@....com, diana.craciun@....com, gpkulkarni@...il.com,
        shankerd@...eaurora.org, bharat.bhushan@....com,
        geethasowjanya.akula@...il.com
Subject: Re: [PATCH v6 01/18] iommu/dma: Allow MSI-only cookies

On Thu, Jan 05, 2017 at 07:04:29PM +0000, Eric Auger wrote:
>  struct iommu_dma_cookie {
> -	struct iova_domain	iovad;
> -	struct list_head	msi_page_list;
> -	spinlock_t		msi_lock;
> +	union {
> +		struct iova_domain	iovad;
> +		dma_addr_t		msi_iova;
> +	};
> +	struct list_head		msi_page_list;
> +	spinlock_t			msi_lock;
> +	enum iommu_dma_cookie_type	type;

Please move the type to the beginning of the struct and add a comment
how the type relates to the union.



	Joerg