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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Mar 2025 18:46:01.8794 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f67b37af-4e34-4a09-526f-08dd5c15fa43 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023D8.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6728 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250305_184608_853716_49B73304 X-CRM114-Status: GOOD ( 15.73 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Mar 05, 2025 at 01:01:57PM -0400, Jason Gunthorpe wrote: > On Tue, Mar 04, 2025 at 09:04:02PM -0800, Nicolin Chen wrote: > > @@ -2249,10 +2249,22 @@ static void arm_smmu_tlb_inv_context(void *cookie) > > */ > > if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) { > > arm_smmu_tlb_inv_asid(smmu, smmu_domain->cd.asid); > > - } else { > > + } else if (!smmu_domain->nest_parent) { > > cmd.opcode = CMDQ_OP_TLBI_S12_VMALL; > > cmd.tlbi.vmid = smmu_domain->s2_cfg.vmid; > > arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd); > > + } else { > > + struct arm_vsmmu *vsmmu, *next; > > + unsigned long flags; > > + > > + cmd.opcode = CMDQ_OP_TLBI_S12_VMALL; > > + spin_lock_irqsave(&smmu_domain->vsmmus.lock, flags); > > + list_for_each_entry_safe(vsmmu, next, &smmu_domain->vsmmus.list, > > + vsmmus_elm) { > > + cmd.tlbi.vmid = vsmmu->vmid; > > + arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd); Just noticed that here should be vsmmu->smmu. > > + } > > + spin_unlock_irqrestore(&smmu_domain->vsmmus.lock, flags); > > } > > I see.. So this just makes a 3rd classification of invalidation > protocol that uses a spinlock and linked list > > > arm_smmu_atc_inv_domain(smmu_domain, 0, 0); > > This is no good, arm_smmu_atc_inv_domain() is invalidating against the > instance that created the domain. Oh right... we might need an arm_smmu_atc_inv_all() that takes an smmu pointer. This might have some performance downgrade as you worried about though. > IMHO if you do this you should set domain->iommu = NULL to indicate > that the iommu is non-valid in this mode to catch issues. You mean smmu_domain->smmu pointer right? Thanks Nicolin