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| author | Jason Gunthorpe <jgg@nvidia.com> | 2023-09-13 15:43:49 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-09-25 11:41:01 +0200 |
| commit | 786478a90294ea5b149ed1156a43e82d63ea61ff (patch) | |
| tree | 9b630b15f3c10d45900578b81a731fee30be4e85 /drivers/iommu/arm/arm-smmu/qcom_iommu.c | |
| parent | iommu: Remove ops->set_platform_dma_ops() (diff) | |
| download | linux-786478a90294ea5b149ed1156a43e82d63ea61ff.tar.xz linux-786478a90294ea5b149ed1156a43e82d63ea61ff.zip | |
iommu/qcom_iommu: Add an IOMMU_IDENTITIY_DOMAIN
This brings back the ops->detach_dev() code that commit
1b932ceddd19 ("iommu: Remove detach_dev callbacks") deleted and turns it
into an IDENTITY domain.
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/16-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu/qcom_iommu.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c index 775a3cbaff4e..bc45d18f350c 100644 --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c @@ -400,6 +400,44 @@ static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev return 0; } +static int qcom_iommu_identity_attach(struct iommu_domain *identity_domain, + struct device *dev) +{ + struct iommu_domain *domain = iommu_get_domain_for_dev(dev); + struct qcom_iommu_domain *qcom_domain; + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + struct qcom_iommu_dev *qcom_iommu = to_iommu(dev); + unsigned int i; + + if (domain == identity_domain || !domain) + return 0; + + qcom_domain = to_qcom_iommu_domain(domain); + if (WARN_ON(!qcom_domain->iommu)) + return -EINVAL; + + pm_runtime_get_sync(qcom_iommu->dev); + for (i = 0; i < fwspec->num_ids; i++) { + struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]); + + /* Disable the context bank: */ + iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); + + ctx->domain = NULL; + } + pm_runtime_put_sync(qcom_iommu->dev); + return 0; +} + +static struct iommu_domain_ops qcom_iommu_identity_ops = { + .attach_dev = qcom_iommu_identity_attach, +}; + +static struct iommu_domain qcom_iommu_identity_domain = { + .type = IOMMU_DOMAIN_IDENTITY, + .ops = &qcom_iommu_identity_ops, +}; + static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t pgsize, size_t pgcount, int prot, gfp_t gfp, size_t *mapped) @@ -565,6 +603,7 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) } static const struct iommu_ops qcom_iommu_ops = { + .identity_domain = &qcom_iommu_identity_domain, .capable = qcom_iommu_capable, .domain_alloc = qcom_iommu_domain_alloc, .probe_device = qcom_iommu_probe_device, |