netdev - Re: [PATCH net-next] sfc: Stop using iommu

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Message-ID: <296fa369-723f-f9b7-773f-7695b12c9971@gmail.com>
Date:   Thu, 7 Apr 2022 17:05:18 +0100
From:   Edward Cree <ecree.xilinx@...il.com>
To:     Robin Murphy <robin.murphy@....com>, habetsm.xilinx@...il.com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] sfc: Stop using iommu_present()

On 05/04/2022 14:40, Robin Murphy wrote:
> Even if an IOMMU might be present for some PCI segment in the system,
> that doesn't necessarily mean it provides translation for the device
> we care about. It appears that what we care about here is specifically
> whether DMA mapping ops involve any IOMMU overhead or not, so check for
> translation actually being active for our device.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
Acked-by: Edward Cree <ecree.xilinx@...il.com>