RE: [PATCH v2 1/4] iommu/arm-smmu-v3: Add feature detection for HTTU

From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
To: Jason Gunthorpe <jgg@nvidia.com>, Ryan Roberts <ryan.roberts@arm.com>
Cc: "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"joro@8bytes.org" <joro@8bytes.org>,
	"kevin.tian@intel.com" <kevin.tian@intel.com>,
	"nicolinc@nvidia.com" <nicolinc@nvidia.com>,
	"mshavit@google.com" <mshavit@google.com>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"will@kernel.org" <will@kernel.org>,
	"joao.m.martins@oracle.com" <joao.m.martins@oracle.com>,
	jiangkunkun <jiangkunkun@huawei.com>,
	zhukeqian <zhukeqian1@huawei.com>, Linuxarm <linuxarm@huawei.com>
Subject: RE: [PATCH v2 1/4] iommu/arm-smmu-v3: Add feature detection for HTTU
Date: Wed, 24 Apr 2024 13:20:53 +0000	[thread overview]
Message-ID: <6e434a9e97be4abfad8c19dafe88456d@huawei.com> (raw)
In-Reply-To: <20240424122349.GH941030@nvidia.com>

> -----Original Message-----
> From: Jason Gunthorpe <jgg@nvidia.com>
> Sent: Wednesday, April 24, 2024 1:24 PM
> To: Ryan Roberts <ryan.roberts@arm.com>
> Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>;
> iommu@lists.linux.dev; linux-arm-kernel@lists.infradead.org; joro@8bytes.org;
> kevin.tian@intel.com; nicolinc@nvidia.com; mshavit@google.com;
> robin.murphy@arm.com; will@kernel.org; joao.m.martins@oracle.com;
> jiangkunkun <jiangkunkun@huawei.com>; zhukeqian
> <zhukeqian1@huawei.com>; Linuxarm <linuxarm@huawei.com>
> Subject: Re: [PATCH v2 1/4] iommu/arm-smmu-v3: Add feature detection for
> HTTU
> 
> On Wed, Apr 24, 2024 at 11:04:43AM +0100, Ryan Roberts wrote:
> > On 23/04/2024 15:52, Jason Gunthorpe wrote:
> > > On Tue, Apr 23, 2024 at 03:41:30PM +0100, Ryan Roberts wrote:
> > >> Hi,
> > >>
> > >> I'm aiming to (slowly) get more involved with SMMU activities, although I'm
> sure
> > >> it will take a while to get up to speed and provide useful input. It was
> > >> suggested that this series would be a useful starting point to dip my toe in.
> > >> Please bear with me while I ask stupid questions...
> > >
> > > Nice!
> > >
> > > I would like to see this merged as it was part of the original three
> > > implementations for iommufd dirty tracking. The other two have been
> > > merged for a long time now..
> >
> > My understanding is that this series should pretty much apply on top of
> > mainline, is that correct? (in practice there are some conflicts, but I think
> > they are trivial).
> 
> It was originally based on my part 2, but I suspect it could apply
> easially on top of part 2a. I don't think it is worth rebasing to
> v6.9-rc since I expect Will to take 2a.

But isn't arm_smmu_domain_alloc_user() gets introduced only in part 3
of the series? Do we plan to support DIRTY_TRACKING with domain_alloc( )
itself by default? 

Thanks,
Shameer

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