> From: Lu Baolu <baolu...@linux.intel.com>
> Sent: Tuesday, June 21, 2022 10:44 PM
> +struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct
> mm_struct *mm)
> +{
> + struct iommu_domain *domain;
> + ioasid_t max_pasids;
> + int ret = -EINVAL;
> +
> + /* Allocate mm->pasid if necessary. */
this comment is for iommu_sva_alloc_pasid()
> + max_pasids = dev->iommu->max_pasids;
> + if (!max_pasids)
> + return ERR_PTR(-EOPNOTSUPP);
> +
> + ret = iommu_sva_alloc_pasid(mm, 1, max_pasids - 1);
> + if (ret)
> + return ERR_PTR(ret);
> +
...
> +void iommu_sva_unbind_device(struct iommu_sva *handle)
> +{
> + struct device *dev = handle->dev;
> + struct iommu_domain *domain =
> + container_of(handle, struct iommu_domain, bond);
> + ioasid_t pasid = iommu_sva_get_pasid(handle);
> +
> + mutex_lock(&iommu_sva_lock);
> + if (refcount_dec_and_test(&domain->bond.users)) {
> + iommu_detach_device_pasid(domain, dev, pasid);
> + iommu_domain_free(domain);
> + }
> + mutex_unlock(&iommu_sva_lock);
> +}
> +EXPORT_SYMBOL_GPL(iommu_sva_unbind_device);
> +
> +u32 iommu_sva_get_pasid(struct iommu_sva *handle)
> +{
> + struct iommu_domain *domain =
> + container_of(handle, struct iommu_domain, bond);
> +
> + return domain->mm->pasid;
> +}
> +EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
Looks this is only used by unbind_device. Just open code it.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
