Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c
new file mode 100644
index 0000000..ec35747
--- /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;
+}