From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: devicetree@vger.kernel.org, kevin.tian@intel.com, jgg@ziepe.ca,
linux-pci@vger.kernel.org, joro@8bytes.org,
Jonathan.Cameron@huawei.com, robin.murphy@arm.com,
fenghua.yu@intel.com, hch@infradead.org, linux-mm@kvack.org,
iommu@lists.linux-foundation.org, zhangfei.gao@linaro.org,
catalin.marinas@arm.com, felix.kuehling@amd.com,
xuzaibo@huawei.com, will@kernel.org, christian.koenig@amd.com,
linux-arm-kernel@lists.infradead.org, baolu.lu@linux.intel.com
Subject: Re: [PATCH v6 17/25] iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind()
Date: Tue, 5 May 2020 11:15:31 +0200 [thread overview]
Message-ID: <20200505091531.GA203922@myrica> (raw)
In-Reply-To: <20200504134723.54e2ebcd@jacob-builder>
On Mon, May 04, 2020 at 01:47:23PM -0700, Jacob Pan wrote:
> > > > + arm_smmu_write_ctx_desc(smmu_domain, mm->pasid,
> > > > &invalid_cd); +
> > > > + arm_smmu_tlb_inv_asid(smmu_domain->smmu,
> > > > smmu_mn->cd->asid);
> > > > + /* TODO: invalidate ATS */
> > > > +
> > > If mm release is called after tlb invalidate range, is it still
> > > necessary to invalidate again?
> >
> > No, provided all mappings from the address space are unmapped and
> > invalidated. I'll double check, but in my tests invalidate range
> > didn't seem to be called for all mappings on mm exit, so I believe we
> > do need this.
> >
> I think it is safe to invalidate again. There was a concern that mm
> release may delete IOMMU driver from the notification list and miss tlb
> invalidate range. I had a hard time to confirm that with ftrace while
> killing a process, many lost events.
>
If it helps, I have a test that generates small DMA transactions on a SMMU
model. This is the trace for a job on a 8kB mmap'd buffer:
smmu_bind_alloc: dev=0000:00:03.0 pasid=1
dev_fault: IOMMU:0000:00:03.0 type=2 reason=0 addr=0x0000ffff860e6000 pasid=1 group=74 flags=3 prot=2
dev_page_response: IOMMU:0000:00:03.0 code=0 pasid=1 group=74
dev_fault: IOMMU:0000:00:03.0 type=2 reason=0 addr=0x0000ffff860e7000 pasid=1 group=143 flags=3 prot=2
dev_page_response: IOMMU:0000:00:03.0 code=0 pasid=1 group=143
smmu_mm_invalidate: pasid=1 start=0xffff860e6000 end=0xffff860e8000
smmu_mm_invalidate: pasid=1 start=0xffff860e6000 end=0xffff860e8000
smmu_mm_invalidate: pasid=1 start=0xffff860e8000 end=0xffff860ea000
smmu_mm_invalidate: pasid=1 start=0xffff860e8000 end=0xffff860ea000
smmu_unbind_free: dev=0000:00:03.0 pasid=1
And this is the same job, but the process immediately kills itself after
launching it.
smmu_bind_alloc: dev=0000:00:03.0 pasid=1
dev_fault: IOMMU:0000:00:03.0 type=2 reason=0 addr=0x0000ffffb9d15000 pasid=1 group=259 flags=3 prot=2
smmu_mm_release: pasid=1
dev_page_response: IOMMU:0000:00:03.0 code=0 pasid=1 group=259
dev_fault: IOMMU:0000:00:03.0 type=2 reason=0 addr=0x0000ffffb9d15000 pasid=1 group=383 flags=3 prot=2
dev_page_response: IOMMU:0000:00:03.0 code=1 pasid=1 group=383
smmu_unbind_free: dev=0000:00:03.0 pasid=1
We don't get any invalidate_range notification in this case.
Thanks,
Jean
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next prev parent reply other threads:[~2020-05-05 9:15 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 14:33 [PATCH v6 00/25] iommu: Shared Virtual Addressing for SMMUv3 Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 01/25] mm: Add a PASID field to mm_struct Jean-Philippe Brucker
2020-05-04 1:52 ` Xu Zaibo
2020-05-04 16:29 ` Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 02/25] iommu/ioasid: Add ioasid references Jean-Philippe Brucker
2020-04-30 18:39 ` Jacob Pan
2020-04-30 20:48 ` Jacob Pan
2020-05-04 14:39 ` Jean-Philippe Brucker
2020-05-04 15:22 ` Jacob Pan
2020-05-04 14:25 ` Jean-Philippe Brucker
2020-05-04 15:27 ` Jacob Pan
2020-04-30 14:34 ` [PATCH v6 03/25] iommu/sva: Add PASID helpers Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 04/25] iommu: Add a page fault handler Jean-Philippe Brucker
2020-05-03 5:49 ` Lu Baolu
2020-05-04 16:22 ` Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 05/25] iommu/iopf: Handle mm faults Jean-Philippe Brucker
2020-05-03 5:54 ` Lu Baolu
2020-05-04 16:25 ` Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 06/25] arm64: mm: Add asid_gen_match() helper Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 07/25] arm64: mm: Pin down ASIDs for sharing mm with devices Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 08/25] iommu/io-pgtable-arm: Move some definitions to a header Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 09/25] iommu/arm-smmu-v3: Manage ASIDs with xarray Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 10/25] arm64: cpufeature: Export symbol read_sanitised_ftr_reg() Jean-Philippe Brucker
2020-04-30 15:18 ` Suzuki K Poulose
2020-04-30 14:34 ` [PATCH v6 11/25] iommu/arm-smmu-v3: Share process page tables Jean-Philippe Brucker
2020-04-30 15:39 ` Suzuki K Poulose
2020-05-04 14:11 ` Jean-Philippe Brucker
2020-05-04 14:42 ` Suzuki K Poulose
2020-04-30 14:34 ` [PATCH v6 12/25] iommu/arm-smmu-v3: Seize private ASID Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 13/25] iommu/arm-smmu-v3: Add support for VHE Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 14/25] iommu/arm-smmu-v3: Enable broadcast TLB maintenance Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 15/25] iommu/arm-smmu-v3: Add SVA feature checking Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 16/25] iommu/arm-smmu-v3: Add SVA device feature Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 17/25] iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind() Jean-Philippe Brucker
2020-04-30 21:16 ` Jacob Pan
2020-05-04 16:43 ` Jean-Philippe Brucker
2020-05-04 20:47 ` Jacob Pan
2020-05-05 9:15 ` Jean-Philippe Brucker [this message]
2020-05-07 16:31 ` Jacob Pan
2020-05-01 12:15 ` Christoph Hellwig
2020-05-01 12:55 ` Jason Gunthorpe
2020-05-04 16:07 ` Jean-Philippe Brucker
2020-05-04 16:06 ` Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 18/25] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 19/25] iommu/arm-smmu-v3: Add support for Hardware Translation Table Update Jean-Philippe Brucker
2020-05-04 14:24 ` Prabhakar Kushwaha
2020-05-04 16:35 ` Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 20/25] iommu/arm-smmu-v3: Maintain a SID->device structure Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 21/25] dt-bindings: document stall property for IOMMU masters Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 22/25] iommu/arm-smmu-v3: Add stall support for platform devices Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 23/25] PCI/ATS: Add PRI stubs Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 24/25] PCI/ATS: Export PRI functions Jean-Philippe Brucker
2020-04-30 14:34 ` [PATCH v6 25/25] iommu/arm-smmu-v3: Add support for PRI Jean-Philippe Brucker
2020-04-30 21:18 ` [PATCH v6 00/25] iommu: Shared Virtual Addressing for SMMUv3 Jacob Pan
2020-05-04 15:09 ` Jean-Philippe Brucker
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