From: Rob Clark <robdclark@gmail.com>
To: Will Deacon <will@kernel.org>
Cc: freedreno <freedreno@lists.freedesktop.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
"list@263.net:IOMMU DRIVERS <iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>,
" <iommu@lists.linux-foundation.org>,
Robin Murphy <robin.murphy@arm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [Freedreno] [PATCH v12 04/13] iommu: Add a domain attribute to get/set a pagetable configuration
Date: Thu, 13 Aug 2020 09:28:02 -0700 [thread overview]
Message-ID: <CAF6AEGsfP14bJzdJP70YonM6J00+PAZVk2neURT3rb2+PcRNDg@mail.gmail.com> (raw)
In-Reply-To: <20200813151934.GA10534@willie-the-truck>
On Thu, Aug 13, 2020 at 8:19 AM Will Deacon <will@kernel.org> wrote:
>
> On Thu, Aug 13, 2020 at 08:11:02AM -0700, Rob Clark wrote:
> > On Thu, Aug 13, 2020 at 6:14 AM Will Deacon <will@kernel.org> wrote:
> > >
> > > On Mon, Aug 10, 2020 at 04:26:48PM -0600, Jordan Crouse wrote:
> > > > Add domain attribute DOMAIN_ATTR_PGTABLE_CFG. This will be used by
> > > > arm-smmu to share the current pagetable configuration with the
> > > > leaf driver and to allow the leaf driver to set up a new pagetable
> > > > configuration under certain circumstances.
> > > >
> > > > Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
> > > > ---
> > > >
> > > > include/linux/iommu.h | 1 +
> > > > 1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> > > > index fee209efb756..995ab8c47ef2 100644
> > > > --- a/include/linux/iommu.h
> > > > +++ b/include/linux/iommu.h
> > > > @@ -118,6 +118,7 @@ enum iommu_attr {
> > > > DOMAIN_ATTR_FSL_PAMUV1,
> > > > DOMAIN_ATTR_NESTING, /* two stages of translation */
> > > > DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
> > > > + DOMAIN_ATTR_PGTABLE_CFG,
> > > > DOMAIN_ATTR_MAX,
> > > > };
> > >
> > > Nobody other than the adreno gpu uses this, so can we avoid exposing it
> > > in the IOMMU API, please? Given that you have a reference to the adreno
> > > GPU device in the SMMU implementation code thanks to .alloc_context_bank(),
> > > can you squirrel some function pointers away in the driver data (i.e. with
> > > dev_set_drvdata()) instead?
> > >
> >
> > Hmm, we are already using drvdata on the gpu side, and it looks like
> > arm-smmu is also using it. Could we get away with stashing an extra
> > 'void *' in iommu_domain itself?
>
> What I meant was, expose the type of whatever you put in there on the GPU
> side so that the SMMU impl can install its function pointers into a field of
> that structure. As far as I'm concerned, the SMMU impl code and the GPU
> driver are the same entity and we should keep their communication private,
> rather than expose it up the stack. After all, the GPU writes to the SMMU
> registers!
>
> If you really don't want to expose all of your gubbins, I suppose you
> could have a structure just for the SMMU view and container_of() out of
> that on the GPU side.
yeah, msm_gpu has a lot of internal state.. but I suppose we could
define a 'struct adreno_smmu_priv' and embed that in msm_gpu, and
throw in a get_gpu_drvdata() type wrapper for get_drvdata() to make
this not totally horrible in the various cases places that use
get_drvdata() currently.
BR,
-R
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next prev parent reply other threads:[~2020-08-13 16:27 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 22:26 [PATCH v12 00/13] iommu/arm-smmu: Add Adreno SMMU specific implementation Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 01/13] iommu/arm-smmu: Pass io-pgtable config to implementation specific function Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 02/13] iommu/arm-smmu: Add support for split pagetables Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 03/13] iommu/arm-smmu: Prepare for the adreno-smmu implementation Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 04/13] iommu: Add a domain attribute to get/set a pagetable configuration Jordan Crouse
2020-08-13 13:14 ` Will Deacon
2020-08-13 15:11 ` [Freedreno] " Rob Clark
2020-08-13 15:19 ` Will Deacon
2020-08-13 16:28 ` Rob Clark [this message]
2020-08-10 22:26 ` [PATCH v12 05/13] iommu/arm-smmu-qcom: Add implementation for the adreno GPU SMMU Jordan Crouse
2020-08-13 13:23 ` Will Deacon
2020-08-10 22:26 ` [PATCH v12 06/13] dt-bindings: arm-smmu: Add compatible string for Adreno " Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 07/13] drm/msm: Add a context pointer to the submitqueue Jordan Crouse
2020-08-13 16:17 ` [Freedreno] " Rob Clark
2020-08-13 17:04 ` Rob Clark
2020-08-10 22:26 ` [PATCH v12 08/13] drm/msm: Set the global virtual address range from the IOMMU domain Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 09/13] drm/msm: Add support to create a local pagetable Jordan Crouse
2020-08-23 23:05 ` Guenter Roeck
2020-08-10 22:26 ` [PATCH v12 10/13] drm/msm: Add support for private address space instances Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 11/13] drm/msm/a6xx: Add support for per-instance pagetables Jordan Crouse
2020-08-10 22:26 ` [PATCH v12 12/13] arm: dts: qcom: sm845: Set the compatible string for the GPU SMMU Jordan Crouse
2020-08-10 22:26 ` [RFC v12 13/13] iommu/arm-smmu: Add a init_context_bank implementation hook Jordan Crouse
2020-08-13 13:03 ` Will Deacon
2020-08-13 13:19 ` [PATCH v12 00/13] iommu/arm-smmu: Add Adreno SMMU specific implementation Will Deacon
2020-08-14 2:40 ` [PATCH 00/19] iommu/arm-smmu + drm/msm: per-process GPU pgtables Rob Clark
2020-08-17 16:51 ` Jordan Crouse
2020-08-14 2:40 ` [PATCH 01/19] drm/msm: remove dangling submitqueue references Rob Clark
2020-08-17 16:51 ` Jordan Crouse
2020-09-01 2:35 ` Bjorn Andersson
2020-09-01 3:42 ` Rob Clark
2020-09-01 5:42 ` Bjorn Andersson
2020-09-01 5:42 ` Bjorn Andersson
2020-08-14 2:40 ` [PATCH 02/19] iommu/arm-smmu: Pass io-pgtable config to implementation specific function Rob Clark
2020-09-01 3:36 ` Bjorn Andersson
2020-08-14 2:40 ` [PATCH 03/19] iommu/arm-smmu: Add support for split pagetables Rob Clark
2020-09-01 3:41 ` Bjorn Andersson
2020-08-14 2:40 ` [PATCH 04/19] iommu/arm-smmu: Prepare for the adreno-smmu implementation Rob Clark
2020-08-14 2:41 ` [PATCH 05/19] iommu: add private interface for adreno-smmu Rob Clark
2020-08-17 16:52 ` [Freedreno] " Jordan Crouse
2020-09-01 3:52 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 06/19] drm/msm/gpu: add dev_to_gpu() helper Rob Clark
2020-08-17 16:53 ` [Freedreno] " Jordan Crouse
2020-09-01 4:32 ` Bjorn Andersson
2020-09-01 15:53 ` Rob Clark
2020-08-14 2:41 ` [PATCH 07/19] drm/msm: set adreno_smmu as gpu's drvdata Rob Clark
2020-08-17 16:55 ` Jordan Crouse
2020-09-01 4:58 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 08/19] iommu/arm-smmu: constify some helpers Rob Clark
2020-09-01 4:56 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 09/19] iommu/arm-smmu-qcom: Add implementation for the adreno GPU SMMU Rob Clark
2020-09-01 5:00 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 10/19] dt-bindings: arm-smmu: Add compatible string for Adreno " Rob Clark
2020-09-01 5:00 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 11/19] drm/msm: Add a context pointer to the submitqueue Rob Clark
2020-09-01 5:05 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 12/19] drm/msm: Drop context arg to gpu->submit() Rob Clark
2020-09-01 5:06 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 13/19] drm/msm: Set the global virtual address range from the IOMMU domain Rob Clark
2020-09-01 5:23 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 14/19] drm/msm: Add support to create a local pagetable Rob Clark
2020-09-01 5:28 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 15/19] drm/msm: Add support for private address space instances Rob Clark
2020-09-01 5:30 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 16/19] drm/msm/a6xx: Add support for per-instance pagetables Rob Clark
2020-08-17 15:40 ` Akhil P Oommen
2020-08-17 15:51 ` Rob Clark
2020-08-17 16:47 ` Jordan Crouse
2020-08-14 2:41 ` [PATCH 17/19] arm: dts: qcom: sm845: Set the compatible string for the GPU SMMU Rob Clark
2020-08-14 2:41 ` [PATCH 18/19] iommu/arm-smmu: add a way for implementations to influence SCTLR Rob Clark
2020-09-01 5:31 ` Bjorn Andersson
2020-08-14 2:41 ` [PATCH 19/19] drm/msm: show process names in gem_describe Rob Clark
2020-08-17 17:14 ` [Freedreno] " Jordan Crouse
2020-09-01 5:35 ` Bjorn Andersson
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