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

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Message-ID: <943b0907-f2ee-63c1-7134-997ffaf6f348@arm.com>
Date:   Tue, 23 Apr 2019 10:26:11 +0100
From:   Julien Grall <julien.grall@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
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

Hi Thomas,

On 4/18/19 8:28 PM, Thomas Gleixner wrote:
> 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.

Sorry for that. I will rework all the commit messages and resend the series.

Cheers,

-- 
Julien Grall