[PATCH V2 1/5] iommu: Add dev_def_domain_type() call back function to iommu_ops

[Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>]

When user requests kernel to change the default domain type of a group
through sysfs, kernel has to make sure that it's ok to change the domain
type of every device in the group to the requested domain (every device may
not support both the domain types i.e. DMA and identity). Hence, add a call
back function that could be implemented per architecture that performs the
above check.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Sohil Mehta <sohil.mehta@intel.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
---
 include/linux/iommu.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d1b5f4d98569..3f4aaad0aeb7 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -248,6 +248,7 @@ struct iommu_iotlb_gather {
  * @cache_invalidate: invalidate translation caches
  * @sva_bind_gpasid: bind guest pasid and mm
  * @sva_unbind_gpasid: unbind guest pasid and mm
+ * @dev_def_domain_type: Return the required default domain type for a device
  * @pgsize_bitmap: bitmap of all possible supported page sizes
  * @owner: Driver module providing these ops
  */
@@ -318,6 +319,8 @@ struct iommu_ops {
 
 	int (*sva_unbind_gpasid)(struct device *dev, int pasid);
 
+	int (*dev_def_domain_type)(struct device *dev);
+
 	unsigned long pgsize_bitmap;
 	struct module *owner;
 };
-- 
2.7.4

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