[RFC 04/13] ACPI/IORT: Add node categories

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

The current node filtering won't work when introducing node types
greater than 63 (such as the virtio-iommu nodes). Add
node_type_matches() to filter nodes by category.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 drivers/acpi/iort.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/iort.c b/drivers/acpi/iort.c
index 9c6c91e06f8f..1d43fbc0001f 100644
--- a/drivers/acpi/iort.c
+++ b/drivers/acpi/iort.c
@@ -18,10 +18,10 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
-#define IORT_TYPE_MASK(type)	(1 << (type))
-#define IORT_MSI_TYPE		(1 << ACPI_IORT_NODE_ITS_GROUP)
-#define IORT_IOMMU_TYPE		((1 << ACPI_IORT_NODE_SMMU) |	\
-				(1 << ACPI_IORT_NODE_SMMU_V3))
+enum iort_node_category {
+	IORT_MSI_TYPE,
+	IORT_IOMMU_TYPE,
+};
 
 struct iort_its_msi_chip {
 	struct list_head	list;
@@ -38,6 +38,20 @@ struct iort_fwnode {
 static LIST_HEAD(iort_fwnode_list);
 static DEFINE_SPINLOCK(iort_fwnode_lock);
 
+static bool iort_type_matches(u8 type, enum iort_node_category category)
+{
+	switch (category) {
+	case IORT_IOMMU_TYPE:
+		return type == ACPI_IORT_NODE_SMMU ||
+		       type == ACPI_IORT_NODE_SMMU_V3;
+	case IORT_MSI_TYPE:
+		return type == ACPI_IORT_NODE_ITS_GROUP;
+	default:
+		WARN_ON(1);
+		return false;
+	}
+}
+
 /**
  * iort_set_fwnode() - Create iort_fwnode and use it to register
  *		       iommu data in the iort_fwnode_list
@@ -397,7 +411,7 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
 
 static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
 					       u32 id_in, u32 *id_out,
-					       u8 type_mask)
+					       enum iort_node_category category)
 {
 	u32 id = id_in;
 
@@ -406,7 +420,7 @@ static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
 		struct acpi_iort_id_mapping *map;
 		int i, index;
 
-		if (IORT_TYPE_MASK(node->type) & type_mask) {
+		if (iort_type_matches(node->type, category)) {
 			if (id_out)
 				*id_out = id;
 			return node;
@@ -458,8 +472,8 @@ static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
 }
 
 static struct acpi_iort_node *iort_node_map_platform_id(
-		struct acpi_iort_node *node, u32 *id_out, u8 type_mask,
-		int index)
+		struct acpi_iort_node *node, u32 *id_out,
+		enum iort_node_category category, int index)
 {
 	struct acpi_iort_node *parent;
 	u32 id;
@@ -475,8 +489,8 @@ static struct acpi_iort_node *iort_node_map_platform_id(
 	 * as NC (named component) -> SMMU -> ITS. If the type is matched,
 	 * return the initial dev id and its parent pointer directly.
 	 */
-	if (!(IORT_TYPE_MASK(parent->type) & type_mask))
-		parent = iort_node_map_id(parent, id, id_out, type_mask);
+	if (!iort_type_matches(parent->type, category))
+		parent = iort_node_map_id(parent, id, id_out, category);
 	else
 		if (id_out)
 			*id_out = id;
-- 
2.24.0

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