1 files changed, 72 insertions, 14 deletions

diff --git a/arch/x86/mm/amdtopology_64.c b/arch/x86/mm/amdtopology_64.c
index 08a0069b87a5..f21962c435ed 100644
--- a/arch/x86/mm/amdtopology_64.c
+++ b/arch/x86/mm/amdtopology_64.c
@@ -27,6 +27,7 @@
 #include <asm/amd_nb.h>
 
 static struct bootnode __initdata nodes[8];
+static unsigned char __initdata nodeids[8];
 static nodemask_t __initdata nodes_parsed = NODE_MASK_NONE;
 
 static __init int find_northbridge(void)
@@ -68,19 +69,6 @@ static __init void early_get_boot_cpu_id(void)
 #endif
 }
 
-int __init amd_get_nodes(struct bootnode *physnodes)
-{
-        int i;
-        int ret = 0;
-
-        for_each_node_mask(i, nodes_parsed) {
-                physnodes[ret].start = nodes[i].start;
-                physnodes[ret].end = nodes[i].end;
-                ret++;
-        }
-        return ret;
-}
-
 int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
 {
         unsigned long start = PFN_PHYS(start_pfn);
@@ -113,7 +101,7 @@ int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
                 base = read_pci_config(0, nb, 1, 0x40 + i*8);
                 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 
-                nodeid = limit & 7;
+                nodeids[i] = nodeid = limit & 7;
                 if ((base & 3) == 0) {
                         if (i < numnodes)
                                 pr_info("Skipping disabled node %d\n", i);
@@ -193,6 +181,76 @@ int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
         return 0;
 }
 
+#ifdef CONFIG_NUMA_EMU
+static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
+        [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
+};
+
+void __init amd_get_nodes(struct bootnode *physnodes)
+{
+        int i;
+
+        for_each_node_mask(i, nodes_parsed) {
+                physnodes[i].start = nodes[i].start;
+                physnodes[i].end = nodes[i].end;
+        }
+}
+
+static int __init find_node_by_addr(unsigned long addr)
+{
+        int ret = NUMA_NO_NODE;
+        int i;
+
+        for (i = 0; i < 8; i++)
+                if (addr >= nodes[i].start && addr < nodes[i].end) {
+                        ret = i;
+                        break;
+                }
+        return ret;
+}
+
+/*
+ * For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
+ * setup to represent the physical topology but reflect the emulated
+ * environment.  For each emulated node, the real node which it appears on is
+ * found and a fake pxm to nid mapping is created which mirrors the actual
+ * locality.  node_distance() then represents the correct distances between
+ * emulated nodes by using the fake acpi mappings to pxms.
+ */
+void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
+{
+        unsigned int bits;
+        unsigned int cores;
+        unsigned int apicid_base = 0;
+        int i;
+
+        bits = boot_cpu_data.x86_coreid_bits;
+        cores = 1 << bits;
+        early_get_boot_cpu_id();
+        if (boot_cpu_physical_apicid > 0)
+                apicid_base = boot_cpu_physical_apicid;
+
+        for (i = 0; i < nr_nodes; i++) {
+                int index;
+                int nid;
+                int j;
+
+                nid = find_node_by_addr(nodes[i].start);
+                if (nid == NUMA_NO_NODE)
+                        continue;
+
+                index = nodeids[nid] << bits;
+                if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)
+                        for (j = apicid_base; j < cores + apicid_base; j++)
+                                fake_apicid_to_node[index + j] = i;
+#ifdef CONFIG_ACPI_NUMA
+                __acpi_map_pxm_to_node(nid, i);
+#endif
+        }
+        memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
+}
+#endif /* CONFIG_NUMA_EMU */
+
 int __init amd_scan_nodes(void)
 {
         unsigned int bits;