The PASID-granular 2nd level address translation makes it possible to isolate and protect a mediated device exposed by a real device which support PCI PASID features. This patch adds support to allocate a domain for a mediated device. A default pasid value will be allocated as well for the mediated device. This will be used by the mediated device attached to this domain for non-SVM DMA transactions.
Cc: Ashok Raj <[email protected]> Cc: Jacob Pan <[email protected]> Cc: Kevin Tian <[email protected]> Cc: Liu Yi L <[email protected]> Signed-off-by: Sanjay Kumar <[email protected]> Signed-off-by: Lu Baolu <[email protected]> --- drivers/iommu/intel-iommu.c | 17 ++++++++++++++++- include/linux/intel-iommu.h | 5 +++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index fc3ac1c..3ede34a 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1926,6 +1926,9 @@ static void domain_exit(struct dmar_domain *domain) domain_remove_dev_info(domain); rcu_read_unlock(); + if (domain->default_pasid > 0) + intel_pasid_free_id(domain->default_pasid); + /* destroy iovas */ put_iova_domain(&domain->iovad); @@ -2519,11 +2522,23 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu, } } + if (dev && dev_is_mdev(dev) && domain->default_pasid <= 0) { + int max = intel_pasid_get_dev_max_id(dev_mdev_parent(dev)); + + domain->default_pasid = intel_pasid_alloc_id(domain, PASID_MIN, + max, GFP_KERNEL); + if (domain->default_pasid < 0) { + free_devinfo_mem(info); + return NULL; + } + } + spin_lock_irqsave(&device_domain_lock, flags); if (dev) found = find_domain(dev); - if (!found) { + /* A mediated device never has an DMA alias. Ignore searching. */ + if (!found && !dev_is_mdev(dev)) { struct device_domain_info *info2; info2 = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn); if (info2) { diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 7efc632..9f5dcf6 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -423,6 +423,11 @@ struct dmar_domain { 2 == 1GiB, 3 == 512GiB, 4 == 1TiB */ u64 max_addr; /* maximum mapped address */ + int default_pasid; /* + * The default pasid used for non-SVM + * traffic on mediated devices. + */ + struct iommu_domain domain; /* generic domain data structure for iommu core */ }; -- 2.7.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
