@@ -108,6 +108,47 @@ static struct memory_target *find_mem_target(unsigned int mem_pxm)
return NULL;
}
+static struct memory_target *acpi_find_genport_target(u32 uid)
+{
+ struct memory_target *target;
+ u32 target_uid;
+ u8 *uid_ptr;
+
+ list_for_each_entry(target, &targets, node) {
+ uid_ptr = target->gen_port_device_handle + 8;
+ target_uid = *(u32 *)uid_ptr;
+ if (uid == target_uid)
+ return target;
+ }
+
+ return NULL;
+}
+
+/**
+ * acpi_get_genport_coordinates - Retrieve the access coordinates for a generic port
+ * @uid: ACPI unique id
+ * @coord: The access coordinates written back out for the generic port
+ *
+ * Return: 0 on success. Errno on failure.
+ *
+ * Only supports device handles that are ACPI. Assume ACPI0016 HID for CXL.
+ */
+int acpi_get_genport_coordinates(u32 uid,
+ struct access_coordinate *coord)
+{
+ struct memory_target *target;
+
+ guard(mutex)(&target_lock);
+ target = acpi_find_genport_target(uid);
+ if (!target)
+ return -ENOENT;
+
+ *coord = target->coord[NODE_ACCESS_CLASS_GENPORT_SINK];
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(acpi_get_genport_coordinates, CXL);
+
static __init void alloc_memory_initiator(unsigned int cpu_pxm)
{
struct memory_initiator *initiator;
@@ -15,6 +15,7 @@
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/uuid.h>
+#include <linux/node.h>
struct irq_domain;
struct irq_domain_ops;
@@ -424,6 +425,16 @@ extern int acpi_blacklisted(void);
extern void acpi_osi_setup(char *str);
extern bool acpi_osi_is_win8(void);
+#ifdef CONFIG_ACPI_HMAT
+int acpi_get_genport_coordinates(u32 uid, struct access_coordinate *coord);
+#else
+static inline int acpi_get_genport_coordinates(u32 uid,
+ struct access_coordinate *coord)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
#ifdef CONFIG_ACPI_NUMA
int acpi_map_pxm_to_node(int pxm);
int acpi_get_node(acpi_handle handle);