From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
Alex Williamson <alex.williamson@redhat.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
David Airlie <airlied@linux.ie>,
Robin Murphy <robin.murphy@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Christoph Hellwig <hch@infradead.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
Thierry Reding <thierry.reding@gmail.com>,
Ben Skeggs <bskeggs@redhat.com>, Daniel Vetter <daniel@ffwll.ch>,
Will Deacon <will@kernel.org>
Subject: Re: [PATCH 7/7] iommu: Add iommu_domain::domain_ops
Date: Wed, 26 Jan 2022 09:41:13 +0000 [thread overview]
Message-ID: <YfEXOegPuG846NEb@myrica> (raw)
In-Reply-To: <20220124163302.GC966497@nvidia.com>
On Mon, Jan 24, 2022 at 12:33:02PM -0400, Jason Gunthorpe wrote:
> On Mon, Jan 24, 2022 at 10:16:07AM +0000, Jean-Philippe Brucker wrote:
> > On Mon, Jan 24, 2022 at 09:58:18AM +0000, Tian, Kevin wrote:
> > > > From: Lu Baolu <baolu.lu@linux.intel.com>
> > > > Sent: Monday, January 24, 2022 3:11 PM
> > > > +/**
> > > > + * struct domain_ops - per-domain ops
> > > > + * @attach_dev: attach an iommu domain to a device
> > > > + * @detach_dev: detach an iommu domain from a device
> > >
> > > What is the criteria about whether an op should be iommu_ops or domain_ops
> > > when it requires both domain and device pointers like above two (and future
> > > PASID-based attach)?
> > >
> > > Other examples include:
> > > @apply_resv_region
> > > @is_attach_deferred
> >
> > Could attach_dev() be an IOMMU op? So a driver could set the domain ops
> > in attach_dev() rather than domain_alloc(). That would allow to install
> > map()/unmap() ops that are tailored for the device's IOMMU, which we don't
> > know at domain_alloc() time.
>
> I think we should be moving toward 'domain_alloc' returning the
> correct domain and the way the driver implements the domain shouldn't
> change after that.
>
> > I'm thinking about a guest that has both physical and virtual
> > endpoints, which would ideally use different kinds of domain ops to
> > support both efficiently (caching mode vs page tables)
>
> In this case shouldn't domain_alloc() reached from the struct device
> already do the correct thing?
Sure, if we can finalise the domains before attach that could also clean
up the drivers a bit.
Thanks,
Jean
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next prev parent reply other threads:[~2022-01-26 9:41 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 7:10 [PATCH 0/7] iommu cleanup and refactoring Lu Baolu
2022-01-24 7:10 ` [PATCH 1/7] iommu/vt-d: Remove guest pasid related callbacks Lu Baolu
2022-01-24 9:25 ` Christoph Hellwig
2022-01-24 7:10 ` [PATCH 2/7] iommu: Remove guest pasid related interfaces and definitions Lu Baolu
2022-01-24 9:26 ` Christoph Hellwig
2022-01-24 7:10 ` [PATCH 3/7] iommu/vt-d: Remove aux-domain related callbacks Lu Baolu
2022-01-24 9:26 ` Christoph Hellwig
2022-01-24 7:10 ` [PATCH 4/7] iommu: Remove aux-domain related interfaces and iommu_ops Lu Baolu
2022-01-24 9:27 ` Christoph Hellwig
2022-01-24 7:11 ` [PATCH 5/7] drm/nouveau/device: Get right pgsize_bitmap of iommu_domain Lu Baolu
2022-01-24 9:29 ` Christoph Hellwig
2022-01-25 2:59 ` Lu Baolu
2022-01-24 7:11 ` [PATCH 6/7] iommu: Use right way to retrieve iommu_ops Lu Baolu
2022-01-24 9:32 ` Christoph Hellwig
2022-01-25 3:01 ` Lu Baolu
2022-01-24 9:48 ` Tian, Kevin
2022-01-25 3:04 ` Lu Baolu
2022-01-24 17:36 ` Jason Gunthorpe via iommu
2022-01-25 3:18 ` Lu Baolu
2022-01-25 0:20 ` Robin Murphy
2022-01-25 3:54 ` Lu Baolu
2022-01-24 7:11 ` [PATCH 7/7] iommu: Add iommu_domain::domain_ops Lu Baolu
2022-01-24 9:37 ` Christoph Hellwig
2022-01-24 17:24 ` Jason Gunthorpe via iommu
2022-01-25 4:43 ` Lu Baolu
2022-01-25 4:42 ` Lu Baolu
2022-01-24 9:58 ` Tian, Kevin
2022-01-24 10:16 ` Jean-Philippe Brucker
2022-01-24 16:33 ` Jason Gunthorpe via iommu
2022-01-26 9:41 ` Jean-Philippe Brucker [this message]
2022-01-24 17:17 ` Jason Gunthorpe via iommu
2022-01-25 4:59 ` Lu Baolu
2022-01-25 12:37 ` Jason Gunthorpe via iommu
2022-01-24 17:55 ` Jason Gunthorpe via iommu
2022-01-25 5:04 ` Lu Baolu
2022-01-25 0:57 ` Robin Murphy
2022-01-25 6:27 ` Lu Baolu
2022-01-25 14:23 ` Robin Murphy
2022-01-25 15:00 ` Jason Gunthorpe via iommu
2022-01-24 9:46 ` [PATCH 0/7] iommu cleanup and refactoring Tian, Kevin
2022-01-24 17:44 ` Jason Gunthorpe via iommu
2022-01-25 1:11 ` Tian, Kevin
2022-01-25 14:48 ` Robin Murphy
2022-01-25 15:16 ` Jason Gunthorpe via iommu
2022-01-26 1:51 ` Lu Baolu
2022-01-26 13:27 ` Jason Gunthorpe via iommu
2022-01-26 14:00 ` Robin Murphy
2022-02-08 1:32 ` Lu Baolu
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