183 lines
4.1 KiB
C
183 lines
4.1 KiB
C
/*
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* AMD K8 NUMA support.
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* Discover the memory map and associated nodes.
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*
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* This version reads it directly from the K8 northbridge.
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*
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* Copyright 2002,2003 Andi Kleen, SuSE Labs.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/nodemask.h>
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#include <asm/io.h>
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#include <linux/pci_ids.h>
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#include <asm/types.h>
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#include <asm/mmzone.h>
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#include <asm/proto.h>
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#include <asm/e820.h>
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#include <asm/pci-direct.h>
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#include <asm/numa.h>
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static __init int find_northbridge(void)
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{
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int num;
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for (num = 0; num < 32; num++) {
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u32 header;
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header = read_pci_config(0, num, 0, 0x00);
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if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)))
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continue;
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header = read_pci_config(0, num, 1, 0x00);
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if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)))
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continue;
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return num;
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}
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return -1;
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}
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int __init k8_scan_nodes(unsigned long start, unsigned long end)
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{
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unsigned long prevbase;
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struct bootnode nodes[8];
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int nodeid, i, nb;
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unsigned char nodeids[8];
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int found = 0;
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u32 reg;
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unsigned numnodes;
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nodemask_t nodes_parsed;
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unsigned dualcore = 0;
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nodes_clear(nodes_parsed);
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if (!early_pci_allowed())
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return -1;
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nb = find_northbridge();
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if (nb < 0)
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return nb;
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printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
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reg = read_pci_config(0, nb, 0, 0x60);
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numnodes = ((reg >> 4) & 0xF) + 1;
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printk(KERN_INFO "Number of nodes %d\n", numnodes);
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memset(&nodes,0,sizeof(nodes));
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prevbase = 0;
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for (i = 0; i < 8; i++) {
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unsigned long base,limit;
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u32 nodeid;
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/* Undefined before E stepping, but hopefully 0 */
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dualcore |= ((read_pci_config(0, nb, 3, 0xe8) >> 12) & 3) == 1;
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base = read_pci_config(0, nb, 1, 0x40 + i*8);
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limit = read_pci_config(0, nb, 1, 0x44 + i*8);
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nodeid = limit & 7;
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nodeids[i] = nodeid;
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if ((base & 3) == 0) {
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if (i < numnodes)
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printk("Skipping disabled node %d\n", i);
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continue;
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}
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if (nodeid >= numnodes) {
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printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
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base, limit);
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continue;
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}
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if (!limit) {
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printk(KERN_INFO "Skipping node entry %d (base %lx)\n", i,
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base);
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continue;
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}
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if ((base >> 8) & 3 || (limit >> 8) & 3) {
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printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
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nodeid, (base>>8)&3, (limit>>8) & 3);
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return -1;
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}
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if (node_isset(nodeid, nodes_parsed)) {
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printk(KERN_INFO "Node %d already present. Skipping\n",
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nodeid);
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continue;
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}
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limit >>= 16;
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limit <<= 24;
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limit |= (1<<24)-1;
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limit++;
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if (limit > end_pfn << PAGE_SHIFT)
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limit = end_pfn << PAGE_SHIFT;
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if (limit <= base)
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continue;
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base >>= 16;
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base <<= 24;
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if (base < start)
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base = start;
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if (limit > end)
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limit = end;
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if (limit == base) {
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printk(KERN_ERR "Empty node %d\n", nodeid);
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continue;
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}
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if (limit < base) {
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printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
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nodeid, base, limit);
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continue;
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}
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/* Could sort here, but pun for now. Should not happen anyroads. */
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if (prevbase > base) {
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printk(KERN_ERR "Node map not sorted %lx,%lx\n",
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prevbase,base);
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return -1;
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}
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printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
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nodeid, base, limit);
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found++;
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nodes[nodeid].start = base;
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nodes[nodeid].end = limit;
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e820_register_active_regions(nodeid,
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nodes[nodeid].start >> PAGE_SHIFT,
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nodes[nodeid].end >> PAGE_SHIFT);
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prevbase = base;
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node_set(nodeid, nodes_parsed);
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}
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if (!found)
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return -1;
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memnode_shift = compute_hash_shift(nodes, 8);
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if (memnode_shift < 0) {
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printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
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return -1;
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}
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printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
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for (i = 0; i < 8; i++) {
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if (nodes[i].start != nodes[i].end) {
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nodeid = nodeids[i];
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apicid_to_node[nodeid << dualcore] = i;
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apicid_to_node[(nodeid << dualcore) + dualcore] = i;
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setup_node_bootmem(i, nodes[i].start, nodes[i].end);
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}
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}
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numa_init_array();
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return 0;
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}
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