1 files changed, 168 insertions, 0 deletions

diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c
new file mode 100644
index 000000000000..ec35747aacd7
--- /dev/null
+++ b/arch/x86_64/mm/k8topology.c
@@ -0,0 +1,168 @@
+/* 
+ * AMD K8 NUMA support.
+ * Discover the memory map and associated nodes.
+ * 
+ * This version reads it directly from the K8 northbridge.
+ * 
+ * Copyright 2002,2003 Andi Kleen, SuSE Labs.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/nodemask.h>
+#include <asm/io.h>
+#include <linux/pci_ids.h>
+#include <asm/types.h>
+#include <asm/mmzone.h>
+#include <asm/proto.h>
+#include <asm/e820.h>
+#include <asm/pci-direct.h>
+#include <asm/numa.h>
+
+static __init int find_northbridge(void)
+{
+        int num; 
+
+        for (num = 0; num < 32; num++) { 
+                u32 header;
+                
+                header = read_pci_config(0, num, 0, 0x00);  
+                if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)))
+                        continue;       
+
+                header = read_pci_config(0, num, 1, 0x00); 
+                if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)))
+                        continue;       
+                return num; 
+        } 
+
+        return -1;      
+}
+
+int __init k8_scan_nodes(unsigned long start, unsigned long end)
+{ 
+        unsigned long prevbase;
+        struct node nodes[8];
+        int nodeid, i, nb; 
+        int found = 0;
+        u32 reg;
+        unsigned numnodes;
+        nodemask_t nodes_parsed;
+
+        nodes_clear(nodes_parsed);
+
+        nb = find_northbridge(); 
+        if (nb < 0) 
+                return nb;
+
+        printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb); 
+
+        reg = read_pci_config(0, nb, 0, 0x60); 
+        numnodes = ((reg >> 4) & 0xF) + 1;
+
+        printk(KERN_INFO "Number of nodes %d\n", numnodes);
+
+        memset(&nodes,0,sizeof(nodes)); 
+        prevbase = 0;
+        for (i = 0; i < 8; i++) { 
+                unsigned long base,limit; 
+
+                base = read_pci_config(0, nb, 1, 0x40 + i*8);
+                limit = read_pci_config(0, nb, 1, 0x44 + i*8);
+
+                nodeid = limit & 7; 
+                if ((base & 3) == 0) { 
+                        if (i < numnodes)
+                                printk("Skipping disabled node %d\n", i); 
+                        continue;
+                } 
+                if (nodeid >= numnodes) {
+                        printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
+                               base, limit); 
+                        continue;
+                } 
+
+                if (!limit) { 
+                        printk(KERN_INFO "Skipping node entry %d (base %lx)\n", i,
+                               base);
+                        continue;
+                }
+                if ((base >> 8) & 3 || (limit >> 8) & 3) {
+                        printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n", 
+                               nodeid, (base>>8)&3, (limit>>8) & 3); 
+                        return -1; 
+                }       
+                if (node_isset(nodeid, nodes_parsed)) { 
+                        printk(KERN_INFO "Node %d already present. Skipping\n", 
+                               nodeid);
+                        continue;
+                }
+
+                limit >>= 16; 
+                limit <<= 24; 
+                limit |= (1<<24)-1;
+
+                if (limit > end_pfn << PAGE_SHIFT)
+                        limit = end_pfn << PAGE_SHIFT;
+                if (limit <= base)
+                        continue; 
+                        
+                base >>= 16;
+                base <<= 24; 
+
+                if (base < start) 
+                        base = start; 
+                if (limit > end) 
+                        limit = end; 
+                if (limit == base) { 
+                        printk(KERN_ERR "Empty node %d\n", nodeid); 
+                        continue; 
+                }
+                if (limit < base) { 
+                        printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
+                               nodeid, base, limit);                           
+                        continue;
+                } 
+                
+                /* Could sort here, but pun for now. Should not happen anyroads. */
+                if (prevbase > base) { 
+                        printk(KERN_ERR "Node map not sorted %lx,%lx\n",
+                               prevbase,base);
+                        return -1;
+                }
+                        
+                printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n", 
+                       nodeid, base, limit); 
+                
+                found++;
+                
+                nodes[nodeid].start = base; 
+                nodes[nodeid].end = limit;
+
+                prevbase = base;
+
+                node_set(nodeid, nodes_parsed);
+        } 
+
+        if (!found)
+                return -1; 
+
+        memnode_shift = compute_hash_shift(nodes, numnodes);
+        if (memnode_shift < 0) { 
+                printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n"); 
+                return -1; 
+        } 
+        printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift); 
+
+        for (i = 0; i < 8; i++) {
+                if (nodes[i].start != nodes[i].end) { 
+                        /* assume 1:1 NODE:CPU */
+                        cpu_to_node[i] = i; 
+                        setup_node_bootmem(i, nodes[i].start, nodes[i].end); 
+                } 
+        }
+
+        numa_init_array();
+        return 0;
+}