/* * 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 <linux/acpi.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> #include <asm/mpspec.h> #include <asm/apic.h> #include <asm/k8.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)) && header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) && header != (PCI_VENDOR_ID_AMD | (0x1300<<16))) continue; header = read_pci_config(0, num, 1, 0x00); if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) && header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) && header != (PCI_VENDOR_ID_AMD | (0x1301<<16))) continue; return num; } return -1; } static __init void early_get_boot_cpu_id(void) { /* * need to get boot_cpu_id so can use that to create apicid_to_node * in k8_scan_nodes() */ /* * Find possible boot-time SMP configuration: */ #ifdef CONFIG_X86_MPPARSE early_find_smp_config(); #endif #ifdef CONFIG_ACPI /* * Read APIC information from ACPI tables. */ early_acpi_boot_init(); #endif #ifdef CONFIG_X86_MPPARSE /* * get boot-time SMP configuration: */ if (smp_found_config) early_get_smp_config(); #endif early_init_lapic_mapping(); } int __init k8_scan_nodes(unsigned long start, unsigned long end) { unsigned numnodes, cores, bits, apicid_base; unsigned long prevbase; struct bootnode nodes[8]; int i, j, nb, found = 0; u32 nodeid, reg; if (!early_pci_allowed()) return -1; 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; if (numnodes <= 1) return -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, node_possible_map)) { printk(KERN_INFO "Node %d already present. Skipping\n", nodeid); continue; } limit >>= 16; limit <<= 24; limit |= (1<<24)-1; limit++; if (limit > max_pfn << PAGE_SHIFT) limit = max_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, node_possible_map); } if (!found) return -1; memnode_shift = compute_hash_shift(nodes, 8, NULL); 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); /* use the coreid bits from early_identify_cpu */ bits = boot_cpu_data.x86_coreid_bits; cores = (1<<bits); apicid_base = 0; /* need to get boot_cpu_id early for system with apicid lifting */ early_get_boot_cpu_id(); if (boot_cpu_physical_apicid > 0) { printk(KERN_INFO "BSP APIC ID: %02x\n", boot_cpu_physical_apicid); apicid_base = boot_cpu_physical_apicid; } for (i = 0; i < 8; i++) { if (nodes[i].start == nodes[i].end) continue; e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT, nodes[i].end >> PAGE_SHIFT); for (j = apicid_base; j < cores + apicid_base; j++) apicid_to_node[(i << bits) + j] = i; setup_node_bootmem(i, nodes[i].start, nodes[i].end); } numa_init_array(); return 0; }