On Mon, Nov 6, 2023 at 3:26 PM Jason Wang [off-list ref] wrote:

On Sat, Nov 4, 2023 at 1:18 AM Cindy Lu [off-list ref] wrote:

quoted

Expose the function iommu_device_use_default_domain() and
iommu_device_unuse_default_domain()，
While vdpa bind the iommufd device and detach the iommu device,
vdpa need to call the function
iommu_device_unuse_default_domain() to release the owner

Signed-off-by: Cindy Lu <redacted>

This is the end of the series, who is the user then?

Thanks

hi Jason
These 2 functions was called in vhost_vdpa_iommufd_set_device(), Vdpa need to
release the dma owner, otherwise, the function will fail when
iommufd called iommu_device_claim_dma_owner() in iommufd_device_bind()
I will change this sequence, Or maybe will find some other way to fix
this problem
thanks
cindy

quoted

---
 drivers/iommu/iommu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3bfc56df4f78..987cbf8c9a87 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c

@@ -3164,6 +3164,7 @@ int iommu_device_use_default_domain(struct device *dev)

        return ret;
 }
+EXPORT_SYMBOL_GPL(iommu_device_use_default_domain);

 /**
  * iommu_device_unuse_default_domain() - Device driver stops handling device

@@ -3187,6 +3188,7 @@ void iommu_device_unuse_default_domain(struct device *dev)
        mutex_unlock(&group->mutex);
        iommu_group_put(group);
 }
+EXPORT_SYMBOL_GPL(iommu_device_unuse_default_domain);

 static int __iommu_group_alloc_blocking_domain(struct iommu_group *group)
 {
--

2.34.3