[xen staging] iommu/arm: Add iommu_dt_xlate()

[patchbot@xxxxxxx]

commit b8f43b71dad07a4878d0ee3061fd963429a04727
Author:     Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
AuthorDate: Fri Mar 14 13:34:50 2025 +0000
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Apr 21 17:37:41 2025 -0700

    iommu/arm: Add iommu_dt_xlate()
    
    Move code for processing DT IOMMU specifier to a separate helper.
    This helper will be re-used for adding PCI devices by the subsequent
    patches as we will need exact the same actions for processing
    DT PCI-IOMMU specifier.
    
    Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
    Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
    Signed-off-by: Mykyta Poturai <mykyta_poturai@xxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/drivers/passthrough/device_tree.c | 42 ++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/xen/drivers/passthrough/device_tree.c 
b/xen/drivers/passthrough/device_tree.c
index 075fb25a37..4a1971c3fc 100644
--- a/xen/drivers/passthrough/device_tree.c
+++ b/xen/drivers/passthrough/device_tree.c
@@ -137,6 +137,30 @@ int iommu_release_dt_devices(struct domain *d)
     return 0;
 }
 
+static int iommu_dt_xlate(struct device *dev,
+                          const struct dt_phandle_args *iommu_spec,
+                          const struct iommu_ops *ops)
+{
+    int rc;
+
+    if ( !ops->dt_xlate )
+        return -EINVAL;
+
+    if ( !dt_device_is_available(iommu_spec->np) )
+        return 1;
+
+    rc = iommu_fwspec_init(dev, &iommu_spec->np->dev);
+    if ( rc )
+        return rc;
+
+    /*
+     * Provide DT IOMMU specifier which describes the IOMMU master
+     * interfaces of that device (device IDs, etc) to the driver.
+     * The driver is responsible to decide how to interpret them.
+     */
+    return ops->dt_xlate(dev, iommu_spec);
+}
+
 int iommu_remove_dt_device(struct dt_device_node *np)
 {
     const struct iommu_ops *ops = iommu_get_ops();
@@ -215,27 +239,15 @@ int iommu_add_dt_device(struct dt_device_node *np)
     {
         /*
          * The driver which supports generic IOMMU DT bindings must have
-         * these callback implemented.
+         * this callback implemented.
          */
-        if ( !ops->add_device || !ops->dt_xlate )
+        if ( !ops->add_device )
         {
             rc = -EINVAL;
             goto fail;
         }
 
-        if ( !dt_device_is_available(iommu_spec.np) )
-            break;
-
-        rc = iommu_fwspec_init(dev, &iommu_spec.np->dev);
-        if ( rc )
-            break;
-
-        /*
-         * Provide DT IOMMU specifier which describes the IOMMU master
-         * interfaces of that device (device IDs, etc) to the driver.
-         * The driver is responsible to decide how to interpret them.
-         */
-        rc = ops->dt_xlate(dev, &iommu_spec);
+        rc = iommu_dt_xlate(dev, &iommu_spec, ops);
         if ( rc )
             break;
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging