linux-kernel - Re: [PATCH 16/23] iommu/arm-smmu: Prepare for multiple DMA domain types

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Date:   Mon, 26 Jul 2021 14:09:00 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     will@...nel.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        suravee.suthikulpanit@....com, baolu.lu@...ux.intel.com,
        john.garry@...wei.com, dianders@...omium.org
Subject: Re: [PATCH 16/23] iommu/arm-smmu: Prepare for multiple DMA domain
 types

On 2021-07-26 13:46, Joerg Roedel wrote:
> On Wed, Jul 21, 2021 at 07:20:27PM +0100, Robin Murphy wrote:
>> -	if (type == IOMMU_DOMAIN_DMA && using_legacy_binding)
>> +	if ((type & __IOMMU_DOMAIN_DMA_API) && using_legacy_binding)
> 
> Hmm, I wonder whether it is time to introduce helpers for these checks?
> 
> Something like iommu_domain_is_dma() is more readable.

Ha, I had exactly that at one point, except I think in the order of 
iommu_is_dma_domain() :)

The end result didn't seem to give enough extra clarity to justify the 
header churn for me, but I'm happy to be wrong about that if you prefer.

Cheers,
Robin.