From: Robin Murphy <robin.murphy@arm.com>
To: Jason Gunthorpe <jgg@nvidia.com>, Vincent Chen <vincent.chen@sifive.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>,
Albert Ou <aou@eecs.berkeley.edu>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
linux-riscv@lists.infradead.org,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <pjw@kernel.org>,
Tomasz Jeznach <tjeznach@rivosinc.com>,
Will Deacon <will@kernel.org>,
lihangjing@bytedance.com, Xu Lu <luxu.kernel@bytedance.com>,
patches@lists.linux.dev, xieyongji@bytedance.com
Subject: Re: [PATCH v2 0/5] Convert riscv to use the generic iommu page table
Date: Thu, 29 Jan 2026 11:21:53 +0000 [thread overview]
Message-ID: <b1b220be-fd5e-4f83-8f5e-7d5282be39f9@arm.com> (raw)
In-Reply-To: <20260123135234.GW1134360@nvidia.com>
On 2026-01-23 1:52 pm, Jason Gunthorpe wrote:
> On Fri, Jan 23, 2026 at 08:29:01PM +0800, Vincent Chen wrote:
>
>> With this codebase, the IOMMU group type is now correctly configured as
>> DMA:
>>
>> # cat /sys/kernel/iommu_groups/0/type
>> DMA
>> # cat /sys/kernel/iommu_groups/1/type
>> DMA
>>
>> I re-ran the iperf3 test in this environment, and the test passed
>> successfully.
>
> OK great thanks alot!
>
> I'm surprised it doesn't say DMA-FQ, someone from RISCV may want to
> investigate that, it is probably reducing performance..
The driver does not advertise IOMMU_CAP_DEFERRED_FLUSH, as the existing
pagetable code has never implemented the conditional TLB maintenance
optimisation that makes it meaningful. Mind you, I don't see any
reference to iommu_iotlb_gather_queued() in generic_pt either, so I have
no idea how that's trying to do it :/
Thanks,
Robin.
next prev parent reply other threads:[~2026-01-29 11:21 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-06 15:06 [PATCH v2 0/5] Convert riscv to use the generic iommu page table Jason Gunthorpe
2026-01-06 15:06 ` [PATCH v2 1/5] iommupt: Add the RISC-V page table format Jason Gunthorpe
2026-01-30 19:21 ` Andrew Jones
2026-01-30 23:47 ` Jason Gunthorpe
2026-01-06 15:06 ` [PATCH v2 2/5] iommu/riscv: Disable SADE Jason Gunthorpe
2026-01-06 15:06 ` [PATCH v2 3/5] iommu/riscv: Use the generic iommu page table Jason Gunthorpe
2026-01-06 15:06 ` [PATCH v2 4/5] iommu/riscv: Enable SVNAPOT support for contiguous ptes Jason Gunthorpe
2026-01-06 15:06 ` [PATCH v2 5/5] iommu/riscv: Allow RISC_VIOMMU to COMPILE_TEST Jason Gunthorpe
2026-01-30 19:58 ` Andrew Jones
2026-01-30 23:44 ` Jason Gunthorpe
2026-02-04 16:09 ` Andrew Jones
2026-01-22 1:46 ` [PATCH v2 0/5] Convert riscv to use the generic iommu page table Vincent Chen
2026-01-22 15:31 ` Jason Gunthorpe
2026-01-23 3:05 ` Vincent Chen
2026-01-23 12:29 ` Vincent Chen
2026-01-23 13:52 ` Jason Gunthorpe
2026-01-29 11:21 ` Robin Murphy [this message]
2026-01-31 0:27 ` Jason Gunthorpe
2026-02-02 14:00 ` Robin Murphy
2026-02-02 14:37 ` Jason Gunthorpe
2026-02-02 16:43 ` Robin Murphy
2026-01-22 7:56 ` Joerg Roedel
2026-01-29 0:46 ` Jason Gunthorpe
2026-01-30 23:14 ` Paul Walmsley
2026-01-31 1:28 ` Tomasz Jeznach
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