linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: limit use of 2-level stream tables

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Message-ID: <20170112172019.GI13843@arm.com>
Date:   Thu, 12 Jan 2017 17:20:19 +0000
From:   Will Deacon <will.deacon@....com>
To:     Nate Watterson <nwatters@...eaurora.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-v3: limit use of 2-level stream tables

On Tue, Jan 10, 2017 at 02:47:13PM -0500, Nate Watterson wrote:
> In the current arm-smmu-v3 driver, all smmus that support 2-level
> stream tables are being forced to use them. This is suboptimal for
> smmus that support fewer stream id bits than would fill in a single
> second level table. This patch limits the use of 2-level tables to
> smmus that both support the feature and whose first level table can
> possibly contain more than a single entry.
> 
> Signed-off-by: Nate Watterson <nwatters@...eaurora.org>
> ---
>  drivers/iommu/arm-smmu-v3.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)

Thanks Nate, I'll queue this for 4.11. Sorry for messing you about before.

Will