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Wed, 24 Jan 2024 21:09:24 -0800 Date: Wed, 24 Jan 2024 21:09:22 -0800 From: Nicolin Chen To: "zhangzekun (A)" CC: Jason Gunthorpe , "will@kernel.org" , Robin Murphy , "joro@8bytes.org" , "jean-philippe@linaro.org" , Alistair Popple , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux.dev" Subject: Re: [PATCH 1/3] iommu/io-pgtable-arm: Add nents_per_pgtable in struct io_pgtable_cfg Message-ID: References: <0fe68babdb3a07adf024ed471fead4e3eb7e703f.1692693557.git.nicolinc@nvidia.com> <61f9b371-7c45-26b1-ec0f-600765280c89@arm.com> <20240122130152.GP734935@nvidia.com> <098d64da-ecf5-4a23-bff9-a04840726ef0@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <098d64da-ecf5-4a23-bff9-a04840726ef0@huawei.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E3:EE_|DM6PR12MB4878:EE_ X-MS-Office365-Filtering-Correlation-Id: 52060eb3-4988-4682-0508-08dc1d63d154 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jan 24, 2024 at 02:20:14PM +0800, zhangzekun (A) wrote: > Also, it seems to me that SVA use cases and, say, DMA API cases are > somewhat different where we may be willing to wait longer for DMA API. > Hmm, the lockup that my patch fixed was for an SVA case that > doesn't seem to involve DMA API: > https://lore.kernel.org/linux-iommu/20230901203904.4073-1-nicolinc@nvidia.com/ > > And the other lockup fix for a non-SVA case from Zhang doesn't > seem to involve DMA API either: > https://lore.kernel.org/linux-iommu/e74ea905-d107-4202-97ca-c2c509e7aa1e@huawei.com/ > > > Hi, Nicolin > > These patches do involve DMA APIs, because it modifies arm_smmu_tlb_inv_walk() which will be called when unmapping dma address space. > > iommu_dma_unmap_page > __iommu_dma_unmap > __iommu_unmap > arm_smmu_unmap_pages > arm_lpae_unmap_pages > io_pgtable_tlb_flush_walk > arm_smmu_tlb_inv_walk > Oh, thanks for clarifying. I was just looking at your trace log there, but overlooked other places. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel