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iommu/qcom_iommu: Add an IOMMU_IDENTITIY_DOMAIN

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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>
This commit is contained in:
Jason Gunthorpe 2023-09-13 10:43:49 -03:00 committed by Joerg Roedel
parent 24b1d47616
commit 786478a902
1 changed files with 39 additions and 0 deletions
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39
drivers/iommu/arm/arm-smmu/qcom_iommu.c
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@ -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,