294 lines
6.7 KiB
C
294 lines
6.7 KiB
C
/*
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* AMD 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 AMD 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 <linux/memblock.h>
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#include <asm/io.h>
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#include <linux/pci_ids.h>
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#include <linux/acpi.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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#include <asm/mpspec.h>
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#include <asm/apic.h>
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#include <asm/amd_nb.h>
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static struct bootnode __initdata nodes[8];
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static unsigned char __initdata nodeids[8];
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static nodemask_t __initdata nodes_parsed = NODE_MASK_NONE;
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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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header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
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header != (PCI_VENDOR_ID_AMD | (0x1300<<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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header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
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header != (PCI_VENDOR_ID_AMD | (0x1301<<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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static __init void early_get_boot_cpu_id(void)
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{
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/*
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* need to get the APIC ID of the BSP so can use that to
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* create apicid_to_node in amd_scan_nodes()
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*/
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#ifdef CONFIG_X86_MPPARSE
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/*
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* get boot-time SMP configuration:
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*/
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if (smp_found_config)
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early_get_smp_config();
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#endif
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}
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int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
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{
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unsigned long start = PFN_PHYS(start_pfn);
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unsigned long end = PFN_PHYS(end_pfn);
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unsigned numnodes;
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unsigned long prevbase;
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int i, nb, found = 0;
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u32 nodeid, reg;
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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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pr_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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if (numnodes <= 1)
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return -1;
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pr_info("Number of physical nodes %d\n", numnodes);
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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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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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nodeids[i] = nodeid = limit & 7;
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if ((base & 3) == 0) {
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if (i < numnodes)
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pr_info("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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pr_info("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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pr_info("Skipping node entry %d (base %lx)\n",
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i, 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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pr_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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pr_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)
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limit = end;
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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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pr_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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pr_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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pr_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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pr_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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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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return 0;
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}
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#ifdef CONFIG_NUMA_EMU
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static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
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[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
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};
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void __init amd_get_nodes(struct bootnode *physnodes)
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{
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int i;
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for_each_node_mask(i, nodes_parsed) {
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physnodes[i].start = nodes[i].start;
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physnodes[i].end = nodes[i].end;
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}
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}
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static int __init find_node_by_addr(unsigned long addr)
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{
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int ret = NUMA_NO_NODE;
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int i;
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for (i = 0; i < 8; i++)
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if (addr >= nodes[i].start && addr < nodes[i].end) {
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ret = i;
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break;
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}
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return ret;
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}
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/*
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* For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
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* setup to represent the physical topology but reflect the emulated
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* environment. For each emulated node, the real node which it appears on is
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* found and a fake pxm to nid mapping is created which mirrors the actual
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* locality. node_distance() then represents the correct distances between
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* emulated nodes by using the fake acpi mappings to pxms.
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*/
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void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
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{
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unsigned int bits;
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unsigned int cores;
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unsigned int apicid_base = 0;
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int i;
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bits = boot_cpu_data.x86_coreid_bits;
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cores = 1 << bits;
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early_get_boot_cpu_id();
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if (boot_cpu_physical_apicid > 0)
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apicid_base = boot_cpu_physical_apicid;
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for (i = 0; i < nr_nodes; i++) {
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int index;
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int nid;
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int j;
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nid = find_node_by_addr(nodes[i].start);
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if (nid == NUMA_NO_NODE)
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continue;
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index = nodeids[nid] << bits;
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if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)
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for (j = apicid_base; j < cores + apicid_base; j++)
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fake_apicid_to_node[index + j] = i;
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#ifdef CONFIG_ACPI_NUMA
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__acpi_map_pxm_to_node(nid, i);
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#endif
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}
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memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
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}
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#endif /* CONFIG_NUMA_EMU */
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int __init amd_scan_nodes(void)
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{
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unsigned int bits;
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unsigned int cores;
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unsigned int apicid_base;
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int i;
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BUG_ON(nodes_empty(nodes_parsed));
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node_possible_map = nodes_parsed;
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memnode_shift = compute_hash_shift(nodes, 8, NULL);
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if (memnode_shift < 0) {
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pr_err("No NUMA node hash function found. Contact maintainer\n");
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return -1;
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}
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pr_info("Using node hash shift of %d\n", memnode_shift);
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/* use the coreid bits from early_identify_cpu */
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bits = boot_cpu_data.x86_coreid_bits;
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cores = (1<<bits);
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apicid_base = 0;
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/* get the APIC ID of the BSP early for systems with apicid lifting */
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early_get_boot_cpu_id();
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if (boot_cpu_physical_apicid > 0) {
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pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
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apicid_base = boot_cpu_physical_apicid;
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}
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for_each_node_mask(i, node_possible_map) {
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int j;
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memblock_x86_register_active_regions(i,
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nodes[i].start >> PAGE_SHIFT,
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nodes[i].end >> PAGE_SHIFT);
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for (j = apicid_base; j < cores + apicid_base; j++)
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apicid_to_node[(i << bits) + j] = i;
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setup_node_bootmem(i, nodes[i].start, nodes[i].end);
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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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