acpi: numa: Add setting of generic port system locality attributes

Add generic port support for the parsing of HMAT system locality sub-table.
The attributes will be added to the third array member of the access
coordinates in order to not mix with the existing memory attributes. It
only provides the system locality attributes from initiator to the
generic port targets and is missing the rest of the data to the actual
memory device.

The complete attributes will be updated when a memory device is
attached and the system locality information is calculated end to end.

Through hmat_update_target_attrs(), the best performance attributes will
be setup in target->coord.

Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Dave Jiang <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Link: https://lore.kernel.org/r/170319618135.2212653.13778540010384821833.stgit@djiang5-mobl3
Signed-off-by: Dan Williams <[email protected]>

drivers/acpi/numa/hmat.c

@@ -61,6 +61,7 @@ struct target_cache {
 enum {
 	NODE_ACCESS_CLASS_0 = 0,
 	NODE_ACCESS_CLASS_1,
+	NODE_ACCESS_CLASS_GENPORT_SINK,
 	NODE_ACCESS_CLASS_MAX,
 };
 
@@ -654,6 +655,11 @@ static void hmat_update_target_attrs(struct memory_target *target,
 	u32 best = 0;
 	int i;
 
+	/* Don't update for generic port if there's no device handle */
+	if (access == NODE_ACCESS_CLASS_GENPORT_SINK &&
+	    !(*(u16 *)target->gen_port_device_handle))
+		return;
+
 	bitmap_zero(p_nodes, MAX_NUMNODES);
 	/*
 	 * If the Address Range Structure provides a local processor pxm, set
@@ -723,6 +729,14 @@ static void __hmat_register_target_initiators(struct memory_target *target,
 	}
 }
 
+static void hmat_register_generic_target_initiators(struct memory_target *target)
+{
+	static DECLARE_BITMAP(p_nodes, MAX_NUMNODES);
+
+	__hmat_register_target_initiators(target, p_nodes,
+					  NODE_ACCESS_CLASS_GENPORT_SINK);
+}
+
 static void hmat_register_target_initiators(struct memory_target *target)
 {
 	static DECLARE_BITMAP(p_nodes, MAX_NUMNODES);
@@ -774,6 +788,17 @@ static void hmat_register_target(struct memory_target *target)
 	 */
 	hmat_register_target_devices(target);
 
+	/*
+	 * Register generic port perf numbers. The nid may not be
+	 * initialized and is still NUMA_NO_NODE.
+	 */
+	mutex_lock(&target_lock);
+	if (*(u16 *)target->gen_port_device_handle) {
+		hmat_register_generic_target_initiators(target);
+		target->registered = true;
+	}
+	mutex_unlock(&target_lock);
+
 	/*
 	 * Skip offline nodes. This can happen when memory
 	 * marked EFI_MEMORY_SP, "specific purpose", is applied