ACPI: HMAT / cxl: Add retrieval of generic port coordinates for both access classes

Update acpi_get_genport_coordinates() to allow retrieval of both access
classes of the 'struct access_coordinate' for a generic target. The update
will allow CXL code to compute access coordinates for both access class.

Cc: Rafael J. Wysocki <rafael@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20240308220055.2172956-5-dave.jiang@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Author: davejiang

drivers/acpi/numa/hmat.c

@@ -126,7 +126,8 @@ static struct memory_target *acpi_find_genport_target(u32 uid)
 /**
  * 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
+ * @coord: The access coordinates written back out for the generic port.
+ *	   Expect 2 levels array.
  *
  * Return: 0 on success. Errno on failure.
  *
@@ -142,7 +143,10 @@ int acpi_get_genport_coordinates(u32 uid,
 	if (!target)
 		return -ENOENT;
 
-	*coord = target->coord[NODE_ACCESS_CLASS_GENPORT_SINK_LOCAL];
+	coord[ACCESS_COORDINATE_LOCAL] =
+		target->coord[NODE_ACCESS_CLASS_GENPORT_SINK_LOCAL];
+	coord[ACCESS_COORDINATE_CPU] =
+		target->coord[NODE_ACCESS_CLASS_GENPORT_SINK_CPU];
 
 	return 0;
 }

drivers/cxl/acpi.c

@@ -530,13 +530,15 @@ static int get_genport_coordinates(struct device *dev, struct cxl_dport *dport)
 	if (kstrtou32(acpi_device_uid(hb), 0, &uid))
 		return -EINVAL;
 
-	rc = acpi_get_genport_coordinates(uid, &dport->hb_coord);
+	rc = acpi_get_genport_coordinates(uid, dport->hb_coord);
 	if (rc < 0)
 		return rc;
 
 	/* Adjust back to picoseconds from nanoseconds */
-	dport->hb_coord.read_latency *= 1000;
-	dport->hb_coord.write_latency *= 1000;
+	for (int i = 0; i < ACCESS_COORDINATE_MAX; i++) {
+		dport->hb_coord[i].read_latency *= 1000;
+		dport->hb_coord[i].write_latency *= 1000;
+	}
 
 	return 0;
 }

drivers/cxl/core/port.c

@@ -2152,7 +2152,7 @@ int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
 	}
 
 	/* Augment with the generic port (host bridge) perf data */
-	combine_coordinates(&c, &dport->hb_coord);
+	combine_coordinates(&c, &dport->hb_coord[ACCESS_COORDINATE_LOCAL]);
 
 	/* Get the calculated PCI paths bandwidth */
 	pdev = to_pci_dev(port->uport_dev->parent);

drivers/cxl/cxl.h

@@ -671,7 +671,7 @@ struct cxl_dport {
 	struct cxl_port *port;
 	struct cxl_regs regs;
 	struct access_coordinate sw_coord;
-	struct access_coordinate hb_coord;
+	struct access_coordinate hb_coord[ACCESS_COORDINATE_MAX];
 	long link_latency;
 };