[PATCH v4 1/6] iommu/ipmmu-vmsa: Link IOMMUs and devices in sysfs

[Geert Uytterhoeven]

As of commit 7af9a5fdb9e0ca33 ("iommu/ipmmu-vmsa: Use
iommu_device_sysfs_add()/remove()"), IOMMU devices show up under
/sys/class/iommu/, but their "devices" subdirectories are empty.
Likewise, devices tied to an IOMMU do not have an "iommu" backlink.

Make sure all links are created, on both arm32 and arm64.

Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
v4:
  - Add Reviewed-by, Tested-by,

v3:
  - Fix sysfs path typo in patch description,

v2:
  - Add Reviewed-by.
---
 drivers/iommu/ipmmu-vmsa.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 9a380c10655e182d..9f2b781e20a0eba6 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -885,27 +885,37 @@ static int ipmmu_init_arm_mapping(struct device *dev)
 
 static int ipmmu_add_device(struct device *dev)
 {
+       struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
        struct iommu_group *group;
+       int ret;
 
        /*
         * Only let through devices that have been verified in xlate()
         */
-       if (!to_ipmmu(dev))
+       if (!mmu)
                return -ENODEV;
 
-       if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA))
-               return ipmmu_init_arm_mapping(dev);
+       if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA)) {
+               ret = ipmmu_init_arm_mapping(dev);
+               if (ret)
+                       return ret;
+       } else {
+               group = iommu_group_get_for_dev(dev);
+               if (IS_ERR(group))
+                       return PTR_ERR(group);
 
-       group = iommu_group_get_for_dev(dev);
-       if (IS_ERR(group))
-               return PTR_ERR(group);
+               iommu_group_put(group);
+       }
 
-       iommu_group_put(group);
+       iommu_device_link(&mmu->iommu, dev);
        return 0;
 }
 
 static void ipmmu_remove_device(struct device *dev)
 {
+       struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
+
+       iommu_device_unlink(&mmu->iommu, dev);
        arm_iommu_detach_device(dev);
        iommu_group_remove_device(dev);
 }
-- 
2.17.1