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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2022 05:41:19.3015 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 38d323e9-57b5-4f33-3f02-08da55a42a04 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.236];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT003.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4396 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220623_224125_913188_5E7885F0 X-CRM114-Status: GOOD ( 26.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, cohuck@redhat.com, mjrosato@linux.ibm.com, jordan@cosmicpenguin.net, linux-tegra@vger.kernel.org, thierry.reding@gmail.com, will@kernel.org, alyssa@rosenzweig.io, jean-philippe@linaro.org, kvm@vger.kernel.org, zhang.lyra@gmail.com, joro@8bytes.org, iommu@lists.linux-foundation.org, jonathanh@nvidia.com, jgg@nvidia.com, yangyingliang@huawei.com, orsonzhai@gmail.com, gerald.schaefer@linux.ibm.com, kevin.tian@intel.com, sven@svenpeter.dev, linux-arm-msm@vger.kernel.org, john.garry@huawei.com, alex.williamson@redhat.com, christophe.jaillet@wanadoo.fr, thunder.leizhen@huawei.com, matthias.bgg@gmail.com, tglx@linutronix.de, virtualization@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, chenxiang66@hisilicon.com, dwmw2@infradead.org, marcan@marcan.st, linux-kernel@vger.kernel.org, robdclark@gmail.com, suravee.suthikulpanit@amd.com, baolin.wang7@gmail.com, linux-mediatek@lists.infradead.org, robin.murphy@arm.com, Baolu Lu Content-Type: text/plain; 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 Fri, Jun 24, 2022 at 01:38:58PM +0800, Yong Wu wrote: > > > > diff --git a/drivers/iommu/mtk_iommu_v1.c > > > > b/drivers/iommu/mtk_iommu_v1.c > > > > index e1cb51b9866c..5386d889429d 100644 > > > > --- a/drivers/iommu/mtk_iommu_v1.c > > > > +++ b/drivers/iommu/mtk_iommu_v1.c > > > > @@ -304,7 +304,7 @@ static int mtk_iommu_v1_attach_device(struct > > > > iommu_domain *domain, struct device > > > > /* Only allow the domain created internally. */ > > > > mtk_mapping = data->mapping; > > > > if (mtk_mapping->domain != domain) > > > > - return 0; > > > > + return -EMEDIUMTYPE; > > > > > > > > if (!data->m4u_dom) { > > > > data->m4u_dom = dom; > > > > > > This change looks odd. It turns the return value from success to > > > failure. Is it a bug? If so, it should go through a separated fix > > > patch. > > Thanks for the review:) > > > > > Makes sense. > > > > I read the commit log of the original change: > > > https://lore.kernel.org/r/1589530123-30240-1-git-send-email-yong.wu@mediatek.com > > > > It doesn't seem to allow devices to get attached to different > > domains other than the shared mapping->domain, created in the > > in the mtk_iommu_probe_device(). So it looks like returning 0 > > is intentional. Though I am still very confused by this return > > value here, I doubt it has ever been used in a VFIO context. > > It's not used in VFIO context. "return 0" just satisfy the iommu > framework to go ahead. and yes, here we only allow the shared "mapping- > >domain" (All the devices share a domain created internally). > > thus I think we should still keep "return 0" here. Thanks for the reply. I will just drop the change of this file. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel