From eaca8889a1ef50783bcaad143668b735d136fe46 Mon Sep 17 00:00:00 2001 From: Lu Baolu Date: Mon, 31 Oct 2022 08:59:11 +0800 Subject: iommu/vt-d: Add SVA domain support Add support for SVA domain allocation and provide an SVA-specific iommu_domain_ops. This implementation is based on the existing SVA code. Possible cleanup and refactoring are left for incremental changes later. The VT-d driver will also need to support setting a DMA domain to a PASID of device. Current SVA implementation uses different data structures to track the domain and device PASID relationship. That's the reason why we need to check the domain type in remove_dev_pasid callback. Eventually we'll consolidate the data structures and remove the need of domain type check. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Reviewed-by: Yi Liu Tested-by: Tony Zhu Link: https://lore.kernel.org/r/20221031005917.45690-8-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel --- drivers/iommu/intel/svm.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'drivers/iommu/intel/svm.c') diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index 94bc47b68c93..86c8ea0d9635 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -882,3 +882,50 @@ int intel_svm_page_response(struct device *dev, out: return ret; } + +void intel_svm_remove_dev_pasid(struct device *dev, ioasid_t pasid) +{ + mutex_lock(&pasid_mutex); + intel_svm_unbind_mm(dev, pasid); + mutex_unlock(&pasid_mutex); +} + +static int intel_svm_set_dev_pasid(struct iommu_domain *domain, + struct device *dev, ioasid_t pasid) +{ + struct device_domain_info *info = dev_iommu_priv_get(dev); + struct intel_iommu *iommu = info->iommu; + struct mm_struct *mm = domain->mm; + struct iommu_sva *sva; + int ret = 0; + + mutex_lock(&pasid_mutex); + sva = intel_svm_bind_mm(iommu, dev, mm); + if (IS_ERR(sva)) + ret = PTR_ERR(sva); + mutex_unlock(&pasid_mutex); + + return ret; +} + +static void intel_svm_domain_free(struct iommu_domain *domain) +{ + kfree(to_dmar_domain(domain)); +} + +static const struct iommu_domain_ops intel_svm_domain_ops = { + .set_dev_pasid = intel_svm_set_dev_pasid, + .free = intel_svm_domain_free +}; + +struct iommu_domain *intel_svm_domain_alloc(void) +{ + struct dmar_domain *domain; + + domain = kzalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) + return NULL; + domain->domain.ops = &intel_svm_domain_ops; + + return &domain->domain; +} -- cgit v1.2.3