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From: Thierry Reding <thierry.reding@gmail.com>
To: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	jonathanh@nvidia.com, linux-tegra@vger.kernel.org
Subject: Re: [PATCH 3/3] iommu/tegra-smmu: Allow to group clients in same swgroup
Date: Thu, 24 Sep 2020 12:25:34 +0200	[thread overview]
Message-ID: <20200924102534.GI2483160@ulmo> (raw)
In-Reply-To: <20200911071643.17212-4-nicoleotsuka@gmail.com>


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On Fri, Sep 11, 2020 at 12:16:43AM -0700, Nicolin Chen wrote:
> There can be clients using the same swgroup in DT, for example i2c0
> and i2c1. The current driver will add them to separate IOMMU groups,
> though it has implemented device_group() callback which is to group
> devices using different swgroups like DC and DCB.
> 
> All clients having the same swgroup should be also added to the same
> IOMMU group so as to share an asid. Otherwise, the asid register may
> get overwritten every time a new device is attached.
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
> ---
>  drivers/iommu/tegra-smmu.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)

Makes sense:

Acked-by: Thierry Reding <treding@nvidia.com>

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_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: Thierry Reding <thierry.reding@gmail.com>
To: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: joro@8bytes.org, linux-kernel@vger.kernel.org,
	iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org,
	jonathanh@nvidia.com, vdumpa@nvidia.com
Subject: Re: [PATCH 3/3] iommu/tegra-smmu: Allow to group clients in same swgroup
Date: Thu, 24 Sep 2020 12:25:34 +0200	[thread overview]
Message-ID: <20200924102534.GI2483160@ulmo> (raw)
In-Reply-To: <20200911071643.17212-4-nicoleotsuka@gmail.com>

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On Fri, Sep 11, 2020 at 12:16:43AM -0700, Nicolin Chen wrote:
> There can be clients using the same swgroup in DT, for example i2c0
> and i2c1. The current driver will add them to separate IOMMU groups,
> though it has implemented device_group() callback which is to group
> devices using different swgroups like DC and DCB.
> 
> All clients having the same swgroup should be also added to the same
> IOMMU group so as to share an asid. Otherwise, the asid register may
> get overwritten every time a new device is attached.
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
> ---
>  drivers/iommu/tegra-smmu.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)

Makes sense:

Acked-by: Thierry Reding <treding@nvidia.com>

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  reply	other threads:[~2020-09-24 10:26 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-11  7:16 [PATCH 0/3] iommu/tegra-smmu: Some small fixes Nicolin Chen
2020-09-11  7:16 ` Nicolin Chen
2020-09-11  7:16 ` [PATCH 1/3] iommu/tegra-smmu: Do not use PAGE_SHIFT and PAGE_MASK Nicolin Chen
2020-09-11  7:16   ` Nicolin Chen
2020-09-24 10:23   ` Thierry Reding
2020-09-24 10:23     ` Thierry Reding
2020-09-11  7:16 ` [PATCH 2/3] iommu/tegra-smmu: Fix iova->phys translation Nicolin Chen
2020-09-11  7:16   ` Nicolin Chen
2020-09-24 10:23   ` Thierry Reding
2020-09-24 10:23     ` Thierry Reding
2020-09-11  7:16 ` [PATCH 3/3] iommu/tegra-smmu: Allow to group clients in same swgroup Nicolin Chen
2020-09-11  7:16   ` Nicolin Chen
2020-09-24 10:25   ` Thierry Reding [this message]
2020-09-24 10:25     ` Thierry Reding
2020-09-24 10:33 ` [PATCH 0/3] iommu/tegra-smmu: Some small fixes Joerg Roedel
2020-09-24 10:33   ` Joerg Roedel

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