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From: Nicolin Chen <nicolinc@nvidia.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: <robin.murphy@arm.com>, <will@kernel.org>,
	<lpieralisi@kernel.org>, <linux-arm-kernel@lists.infradead.org>
Subject: Re: IOMMU_FWSPEC_PCI_RC_ATS for SMMUv3 with DT configuration?
Date: Wed, 6 Mar 2024 19:53:18 -0800	[thread overview]
Message-ID: <Zek6Lu7oAsVKsywE@Asurada-Nvidia> (raw)
In-Reply-To: <20240304092536.GA1730174@myrica>

Hi Jean,

On Mon, Mar 04, 2024 at 09:25:36AM +0000, Jean-Philippe Brucker wrote:
> Hi,
> 
> On Fri, Mar 01, 2024 at 02:00:08PM -0800, Nicolin Chen wrote:
> > Hi all.
> >
> > Currently, the SMMUv3 driver relies on IOMMU_FWSPEC_PCI_RC_ATS
> > in arm_smmu_ats_supported(). This flag seems to be only set in
> > the drivers/acpi/arm64/iort.c file, which does not work for DT
> > configuration.
> >
> > We have a need to enable ATS on a system using Device Tree. Is
> > there a suggested way or name of DT binding to add?
> 
> "ats-supported" was acked by Rob:
> 
> https://lore.kernel.org/linux-iommu/20200311124506.208376-2-jean-philippe@linaro.org/
> 
> I don't remember why I didn't follow up with that series, probably just
> the lack of users at the time (Arm SW model was the only ATS
> implementation). A simpler implementation would be setting the existing
> fwspec flag:
> https://jpbrucker.net/git/linux/commit/?h=sva/current&id=4b6d187154557a7c46c9a67c13453d40a03cc078
 
Thanks for the reply and links!

I am out of office this week. So I've asked my team mate to
get that a try.

Thank you
Nicolin

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  reply	other threads:[~2024-03-07  3:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-01 22:00 IOMMU_FWSPEC_PCI_RC_ATS for SMMUv3 with DT configuration? Nicolin Chen
2024-03-04  9:25 ` Jean-Philippe Brucker
2024-03-07  3:53   ` Nicolin Chen [this message]
2024-04-25  5:11     ` Nicolin Chen

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