of/irq: Add msi-parent check to of_msi_xlate()

[ Upstream commit 119aaeed0b6729293f41ea33be05ecd27a947d48 ]

In some legacy platforms the MSI controller for a PCI host bridge is
identified by an msi-parent property whose phandle points at an MSI
controller node with no #msi-cells property, that implicitly
means #msi-cells == 0.

For such platforms, mapping a device ID and retrieving the MSI controller
node becomes simply a matter of checking whether in the device hierarchy
there is an msi-parent property pointing at an MSI controller node with
such characteristics.

Add a helper function to of_msi_xlate() to check the msi-parent property in
addition to msi-map and retrieve the MSI controller node (with a 1:1 ID
deviceID-IN<->deviceID-OUT  mapping) to provide support for deviceID
mapping and MSI controller node retrieval for such platforms.

Fixes: 57d72196dfc8 ("irqchip/gic-v5: Add GICv5 ITS support")
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Cc: Sascha Bischoff <sascha.bischoff@arm.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20251021124103.198419-2-lpieralisi@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index e7c12abd10ab7c7cbbf8c79d95964eea42f090e2..3d4afeeb30ed7166789b784202719234a1fa01d0 100644 (file)
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -670,6 +670,36 @@ err:
        }
 }
 
+static int of_check_msi_parent(struct device_node *dev_node, struct device_node **msi_node)
+{
+       struct of_phandle_args msi_spec;
+       int ret;
+
+       /*
+        * An msi-parent phandle with a missing or == 0 #msi-cells
+        * property identifies a 1:1 ID translation mapping.
+        *
+        * Set the msi controller node if the firmware matches this
+        * condition.
+        */
+       ret = of_parse_phandle_with_optional_args(dev_node, "msi-parent", "#msi-cells",
+                                                 0, &msi_spec);
+       if (ret)
+               return ret;
+
+       if ((*msi_node && *msi_node != msi_spec.np) || msi_spec.args_count != 0)
+               ret = -EINVAL;
+
+       if (!ret) {
+               /* Return with a node reference held */
+               *msi_node = msi_spec.np;
+               return 0;
+       }
+       of_node_put(msi_spec.np);
+
+       return ret;
+}
+
 /**
  * of_msi_xlate - map a MSI ID and find relevant MSI controller node
  * @dev: device for which the mapping is to be done.
@@ -677,7 +707,7 @@ err:
  * @id_in: Device ID.
  *
  * Walk up the device hierarchy looking for devices with a "msi-map"
- * property. If found, apply the mapping to @id_in.
+ * or "msi-parent" property. If found, apply the mapping to @id_in.
  * If @msi_np points to a non-NULL device node pointer, only entries targeting
  * that node will be matched; if it points to a NULL value, it will receive the
  * device node of the first matching target phandle, with a reference held.
@@ -691,12 +721,15 @@ u32 of_msi_xlate(struct device *dev, struct device_node **msi_np, u32 id_in)
 
        /*
         * Walk up the device parent links looking for one with a
-        * "msi-map" property.
+        * "msi-map" or an "msi-parent" property.
         */
-       for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent)
+       for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) {
                if (!of_map_id(parent_dev->of_node, id_in, "msi-map",
                                "msi-map-mask", msi_np, &id_out))
                        break;
+               if (!of_check_msi_parent(parent_dev->of_node, msi_np))
+                       break;
+       }
        return id_out;
 }