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Date:   Sat,  7 Mar 2020 14:20:09 +0800
From:   Lu Baolu <>
To:     Joerg Roedel <>
Cc:,,,,, Daniel Drake <>,
        Derrick Jonathan <>,
        Jerry Snitselaar <>,
        Robin Murphy <>,
        Christoph Hellwig <>,
        Sai Praneeth Prakhya <>,
        Lu Baolu <>
Subject: [PATCH 1/6] iommu: Add dev_def_domain_type() callback in iommu_ops

From: Sai Praneeth Prakhya <>

Some devices are reqired to use a specific type (identity or dma)
of default domain when they are used with a vendor iommu. When the
system level default domain type is different from it, the vendor
iommu driver has to request a new default domain with
iommu_request_dma_domain_for_dev() and iommu_request_dm_for_dev()
in the add_dev() callback. Unfortunately, these two helpers only
work when the group hasn't been assigned to any other devices,
hence, some vendor iommu driver has to use a private domain if
it fails to request a new default one.

This adds dev_def_domain_type() callback in the iommu_ops, so that
the special requirement of default domain for a device could be
aware by the iommu generic layer.

Signed-off-by: Sai Praneeth Prakhya <>
Signed-off-by: Lu Baolu <>
 include/linux/iommu.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d1b5f4d98569..0c1e95e6b263 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -248,6 +248,10 @@ 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: device default domain type, return value:
+ *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
+ *		- IOMMU_DOMAIN_DMA: must use a dma domain
+ *		- 0: use the default setting
  * @pgsize_bitmap: bitmap of all possible supported page sizes
  * @owner: Driver module providing these ops
@@ -318,6 +322,8 @@ 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;

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