linux-kernel - Re: [PATCH AUTOSEL 5.15 10/47] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity

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Message-ID: <Y0wHZxMV2pRVjvyN@sashalap>
Date:   Sun, 16 Oct 2022 09:30:15 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Yicong Yang <yangyicong@...ilicon.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>, joro@...tes.org,
        robin.murphy@....com, baolu.lu@...ux.intel.com, jgg@...pe.ca,
        tglx@...utronix.de, shameerali.kolothum.thodi@...wei.com,
        christophe.jaillet@...adoo.fr,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev
Subject: Re: [PATCH AUTOSEL 5.15 10/47] iommu/arm-smmu-v3: Make default
 domain type of HiSilicon PTT device to identity

On Thu, Oct 13, 2022 at 08:07:46AM +0100, John Garry wrote:
>On 13/10/2022 01:20, Sasha Levin wrote:
>>From: Yicong Yang<yangyicong@...ilicon.com>
>>
>>[ Upstream commit 24b6c7798a0122012ca848ea0d25e973334266b0 ]
>>
>>The DMA operations of HiSilicon PTT device can only work properly with
>>identical mappings. So add a quirk for the device to force the domain
>>as passthrough.
>>
>>Acked-by: Will Deacon<will@...nel.org>
>>Signed-off-by: Yicong Yang<yangyicong@...ilicon.com>
>>Reviewed-by: John Garry<john.garry@...wei.com>
>>Link:https://lore.kernel.org/r/20220816114414.4092-2-yangyicong@huawei.com
>>Signed-off-by: Mathieu Poirier<mathieu.poirier@...aro.org>
>>Signed-off-by: Sasha Levin<sashal@...nel.org>
>>---
>>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>
>I don't think that this commit should be backported to any stable 
>tree. It's only required for a new driver.

I'll drop it, thanks!
-- 
Thanks,
Sasha