linux-kernel - Re: [PATCH 1/7] genirq/msi: Add a new field in msi

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Message-ID: <alpine.DEB.2.21.1904182126540.3174@nanos.tec.linutronix.de>
Date:   Thu, 18 Apr 2019 21:28:12 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Julien Grall <julien.grall@....com>
cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        logang@...tatee.com, douliyangs@...il.com,
        miquel.raynal@...tlin.com, marc.zyngier@....com,
        jason@...edaemon.net, joro@...tes.org, robin.murphy@....com,
        bigeasy@...utronix.de, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH 1/7] genirq/msi: Add a new field in msi_desc to store an
 IOMMU cookie

On Thu, 18 Apr 2019, Julien Grall wrote:

> When an MSI doorbell is located downstream of an IOMMU, it is required
> to swizzle the physical address with an appropriately-mapped IOVA for any
> device attached to one of our DMA ops domain.
> 
> At the moment, the allocation of the mapping may be done when composing
> the message. However, the composing may be done in non-preemtible
> context while the allocation requires to be called from preemptible
> context.
> 
> A follow-up patch will split the current logic in two functions
> requiring to keep an IOMMU cookie per MSI.
> 
> This patch introduces a new field in msi_desc to store an IOMMU cookie
> when CONFIG_IOMMU_DMA is selected.

# git grep 'This patch' Documentation/process/

Applied to the whole series.

Thanks

	tglx