From: Yasunori Goto <y-goto@jp.fujitsu.com>

In current code, i386, x86-64, and ia64 have separate code.  But PXM is
defined by ACPI and node id is used generically.  So, I think there is no
reason to define it on each arch's code.  This mapping should be written at
drivers/acpi/numa.c as a common code.

This is new generic code for pxm_to_node_map.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/acpi/numa.c      |   50 +++++++++++++++++++++++++++++++++++++
 include/acpi/acpi_numa.h |   18 +++++++++++++
 include/linux/acpi.h     |    1 
 3 files changed, 69 insertions(+)

diff -puN drivers/acpi/numa.c~unify-pxm_to_node-id-ver2-generic-code drivers/acpi/numa.c
--- 25/drivers/acpi/numa.c~unify-pxm_to_node-id-ver2-generic-code	Thu Feb  2 15:27:50 2006
+++ 25-akpm/drivers/acpi/numa.c	Thu Feb  2 15:27:50 2006
@@ -36,12 +36,62 @@
 #define _COMPONENT	ACPI_NUMA
 ACPI_MODULE_NAME("numa")
 
+static nodemask_t nodes_found_map = NODE_MASK_NONE;
+#define PXM_INVAL	0xff
+#define NID_INVAL	0xff
+
+/* maps to convert between proximity domain and logical node ID */
+u8 __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
+				= { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
+u8 __cpuinitdata node_to_pxm_map[MAX_NUMNODES]
+				= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
+
 extern int __init acpi_table_parse_madt_family(enum acpi_table_id id,
 					       unsigned long madt_size,
 					       int entry_id,
 					       acpi_madt_entry_handler handler,
 					       unsigned int max_entries);
 
+int __cpuinit pxm_to_node(int pxm)
+{
+	if ((unsigned)pxm >= 256)
+		return -1;
+	/* Extent 0xff to (int)-1 */
+	return (signed char)pxm_to_node_map[pxm];
+}
+
+int __cpuinit node_to_pxm(int node)
+{
+	if ((unsigned)node >= 256)
+		return -1;
+	/* Extent 0xff to (int)-1 */
+	return (signed char)node_to_pxm_map[node];
+}
+
+int __cpuinit acpi_map_pxm_to_node(u8 pxm)
+{
+	u8 node = pxm_to_node_map[pxm];
+
+	if (node == NID_INVAL){
+		if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
+			return -1;
+		node = first_unset_node(nodes_found_map);
+		pxm_to_node_map[pxm] = node;
+		node_to_pxm_map[node] = pxm;
+		node_set(node, nodes_found_map);
+	}
+
+	return (int)node;
+}
+
+void __cpuinit acpi_unmap_pxm_to_node(int node)
+{
+	u8 pxm = node_to_pxm_map[node];
+	pxm_to_node_map[pxm] = NID_INVAL;
+	node_to_pxm_map[node] = PXM_INVAL;
+	node_clear(node, nodes_found_map);
+}
+
 void __init acpi_table_print_srat_entry(acpi_table_entry_header * header)
 {
 
diff -puN /dev/null include/acpi/acpi_numa.h
--- /dev/null	Thu Apr 11 07:25:15 2002
+++ 25-akpm/include/acpi/acpi_numa.h	Thu Feb  2 15:27:50 2006
@@ -0,0 +1,18 @@
+#ifndef __ACPI_NUMA_H
+#define __ACPI_NUMA_H
+
+#ifdef CONFIG_ACPI_NUMA
+#include <linux/kernel.h>
+
+/* Proximity bitmap length; _PXM is at most 255 (8 bit)*/
+#define MAX_PXM_DOMAINS (256)
+extern u8 __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS];
+extern u8 __cpuinitdata node_to_pxm_map[MAX_NUMNODES];
+
+extern int __cpuinit pxm_to_node(int);
+extern int __cpuinit node_to_pxm(int);
+extern int __cpuinit acpi_map_pxm_to_node(u8);
+extern void __cpuinit acpi_unmap_pxm_to_node(int);
+
+#endif				/* CONFIG_ACPI_NUMA */
+#endif				/* __ACP_NUMA_H */
diff -puN include/linux/acpi.h~unify-pxm_to_node-id-ver2-generic-code include/linux/acpi.h
--- 25/include/linux/acpi.h~unify-pxm_to_node-id-ver2-generic-code	Thu Feb  2 15:27:50 2006
+++ 25-akpm/include/linux/acpi.h	Thu Feb  2 15:27:50 2006
@@ -38,6 +38,7 @@
 #include <acpi/acpi.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
+#include <acpi/acpi_numa.h>
 #include <asm/acpi.h>
 
 
_