[PATCH RFC v2 1/3] iommu: Add set/unset_dev_data_user ops

[Nicolin Chen]

The device behind an IOMMU might be used in the user space by a VM. So, it
might have some user space data. For example, a device behind an SMMU has
a static stream ID. In a virtualization use case, both a host environment
and a guest environment have their own Stream IDs. A link (a lookup table)
between the physical Stream ID and the virtual (user) Stream ID is needed
when the host handles the user cache invalidation commands.

Add a pair of new ops to allow user space to forward user_data of a device
via iommufd.

Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
 include/linux/iommu.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5c99aeaccd1d..c87f0f1527dd 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -257,6 +257,9 @@ struct iommu_iotlb_gather {
  * @remove_dev_pasid: Remove any translation configurations of a specific
  *                    pasid, so that any DMA transactions with this pasid
  *                    will be blocked by the hardware.
+ * @set/unset_dev_data_user: set/unset an iommu specific device data from user
+ *                           space. The user device data info will be used by
+ *                           the driver to take care of user space requests.
  * @hw_info_type: One of enum iommu_hw_info_type defined in
  *                include/uapi/linux/iommufd.h. It is used to tag the type
  *                of data returned by .hw_info callback. The drivers that
@@ -303,6 +306,9 @@ struct iommu_ops {
 	int (*def_domain_type)(struct device *dev);
 	void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
 
+	int (*set_dev_data_user)(struct device *dev, const void *user_data);
+	void (*unset_dev_data_user)(struct device *dev);
+
 	const struct iommu_domain_ops *default_domain_ops;
 	enum iommu_hw_info_type hw_info_type;
 	unsigned long long hwpt_type_bitmap;
-- 
2.40.0