Re: [PATCH v2 01/10] iommu/arm-smmu-v3: Store IOTLB cache tags in struct arm_smmu_attach_state
From: Nicolin Chen <hidden>
Date: 2026-01-27 03:24:16
Also in:
linux-iommu, linux-patches, lkml
On Mon, Jan 26, 2026 at 04:44:43PM -0400, Jason Gunthorpe wrote:
On Wed, Jan 21, 2026 at 05:24:19PM -0800, Nicolin Chen wrote:quoted
+int arm_smmu_domain_get_iotlb_tag(struct arm_smmu_domain *smmu_domain, + struct arm_smmu_device *smmu, + struct arm_smmu_inv *tag) +{ + /* Decide the type of the iotlb cache tag */ + switch (smmu_domain->stage) { + case ARM_SMMU_DOMAIN_SVA: + case ARM_SMMU_DOMAIN_S1: + tag->type = INV_TYPE_S1_ASID; + break; + case ARM_SMMU_DOMAIN_S2: + tag->type = INV_TYPE_S2_VMID; + break; + default: + return -EINVAL; + } + + tag->smmu = smmu; + + if (tag->type == INV_TYPE_S1_ASID) + tag->id = smmu_domain->cd.asid; + else + tag->id = smmu_domain->s2_cfg.vmid;Would be tidier to move these up into the case
This will act as a fake allocation path in PATCh-3 and eventually get replaced with a real allocation piece in PATCH-4. So, I wrote like this in a transitory manner. I can add a line of comments to clarify it. Thanks Nicolin