/* * ACPI 3.0 based NUMA setup * Copyright 2004 Andi Kleen, SuSE Labs. * * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs. * * Called from acpi_numa_init while reading the SRAT and SLIT tables. * Assumes all memory regions belonging to a single proximity domain * are in one chunk. Holes between them will be included in the node. */ #include #include #include #include #include #include #include #include #include static struct acpi_table_slit *acpi_slit; static nodemask_t nodes_parsed __initdata; static nodemask_t nodes_found __initdata; static struct bootnode nodes[MAX_NUMNODES] __initdata; static u8 pxm2node[256] = { [0 ... 255] = 0xff }; /* Too small nodes confuse the VM badly. Usually they result from BIOS bugs. */ #define NODE_MIN_SIZE (4*1024*1024) static int node_to_pxm(int n); int pxm_to_node(int pxm) { if ((unsigned)pxm >= 256) return -1; /* Extend 0xff to (int)-1 */ return (signed char)pxm2node[pxm]; } static __init int setup_node(int pxm) { unsigned node = pxm2node[pxm]; if (node == 0xff) { if (nodes_weight(nodes_found) >= MAX_NUMNODES) return -1; node = first_unset_node(nodes_found); node_set(node, nodes_found); pxm2node[pxm] = node; } return pxm2node[pxm]; } static __init int conflicting_nodes(unsigned long start, unsigned long end) { int i; for_each_node_mask(i, nodes_parsed) { struct bootnode *nd = &nodes[i]; if (nd->start == nd->end) continue; if (nd->end > start && nd->start < end) return i; if (nd->end == end && nd->start == start) return i; } return -1; } static __init void cutoff_node(int i, unsigned long start, unsigned long end) { struct bootnode *nd = &nodes[i]; if (nd->start < start) { nd->start = start; if (nd->end < nd->start) nd->start = nd->end; } if (nd->end > end) { nd->end = end; if (nd->start > nd->end) nd->start = nd->end; } } static __init void bad_srat(void) { int i; printk(KERN_ERR "SRAT: SRAT not used.\n"); acpi_numa = -1; for (i = 0; i < MAX_LOCAL_APIC; i++) apicid_to_node[i] = NUMA_NO_NODE; } static __init inline int srat_disabled(void) { return numa_off || acpi_numa < 0; } /* * A lot of BIOS fill in 10 (= no distance) everywhere. This messes * up the NUMA heuristics which wants the local node to have a smaller * distance than the others. * Do some quick checks here and only use the SLIT if it passes. */ static __init int slit_valid(struct acpi_table_slit *slit) { int i, j; int d = slit->localities; for (i = 0; i < d; i++) { for (j = 0; j < d; j++) { u8 val = slit->entry[d*i + j]; if (i == j) { if (val != 10) return 0; } else if (val <= 10) return 0; } } return 1; } /* Callback for SLIT parsing */ void __init acpi_numa_slit_init(struct acpi_table_slit *slit) { if (!slit_valid(slit)) { printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n"); return; } acpi_slit = slit; } /* Callback for Proximity Domain -> LAPIC mapping */ void __init acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa) { int pxm, node; if (srat_disabled()) return; if (pa->header.length != sizeof(struct acpi_table_processor_affinity)) { bad_srat(); return; } if (pa->flags.enabled == 0) return; pxm = pa->proximity_domain; node = setup_node(pxm); if (node < 0) { printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); bad_srat(); return; } apicid_to_node[pa->apic_id] = node; acpi_numa = 1; printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n", pxm, pa->apic_id, node); } /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */ void __init acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma) { struct bootnode *nd; unsigned long start, end; int node, pxm; int i; if (srat_disabled()) return; if (ma->header.length != sizeof(struct acpi_table_memory_affinity)) { bad_srat(); return; } if (ma->flags.enabled == 0) return; start = ma->base_addr_lo | ((u64)ma->base_addr_hi << 32); end = start + (ma->length_lo | ((u64)ma->length_hi << 32)); pxm = ma->proximity_domain; node = setup_node(pxm); if (node < 0) { printk(KERN_ERR "SRAT: Too many proximity domains.\n"); bad_srat(); return; } /* It is fine to add this area to the nodes data it will be used later*/ if (ma->flags.hot_pluggable == 1) printk(KERN_INFO "SRAT: hot plug zone found %lx - %lx \n", start, end); i = conflicting_nodes(start, end); if (i == node) { printk(KERN_WARNING "SRAT: Warning: PXM %d (%lx-%lx) overlaps with itself (%Lx-%Lx)\n", pxm, start, end, nodes[i].start, nodes[i].end); } else if (i >= 0) { printk(KERN_ERR "SRAT: PXM %d (%lx-%lx) overlaps with PXM %d (%Lx-%Lx)\n", pxm, start, end, node_to_pxm(i), nodes[i].start, nodes[i].end); bad_srat(); return; } nd = &nodes[node]; if (!node_test_and_set(node, nodes_parsed)) { nd->start = start; nd->end = end; } else { if (start < nd->start) nd->start = start; if (nd->end < end) nd->end = end; } printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm, nd->start, nd->end); } /* Sanity check to catch more bad SRATs (they are amazingly common). Make sure the PXMs cover all memory. */ static int nodes_cover_memory(void) { int i; unsigned long pxmram, e820ram; pxmram = 0; for_each_node_mask(i, nodes_parsed) { unsigned long s = nodes[i].start >> PAGE_SHIFT; unsigned long e = nodes[i].end >> PAGE_SHIFT; pxmram += e - s; pxmram -= e820_hole_size(s, e); } e820ram = end_pfn - e820_hole_size(0, end_pfn); /* We seem to lose 3 pages somewhere. Allow a bit of slack. */ if ((long)(e820ram - pxmram) >= 1*1024*1024) { printk(KERN_ERR "SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n", (pxmram << PAGE_SHIFT) >> 20, (e820ram << PAGE_SHIFT) >> 20); return 0; } return 1; } static void unparse_node(int node) { int i; node_clear(node, nodes_parsed); for (i = 0; i < MAX_LOCAL_APIC; i++) { if (apicid_to_node[i] == node) apicid_to_node[i] = NUMA_NO_NODE; } } void __init acpi_numa_arch_fixup(void) {} /* Use the information discovered above to actually set up the nodes. */ int __init acpi_scan_nodes(unsigned long start, unsigned long end) { int i; /* First clean up the node list */ for (i = 0; i < MAX_NUMNODES; i++) { cutoff_node(i, start, end); if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE) unparse_node(i); } if (acpi_numa <= 0) return -1; if (!nodes_cover_memory()) { bad_srat(); return -1; } memnode_shift = compute_hash_shift(nodes, MAX_NUMNODES); if (memnode_shift < 0) { printk(KERN_ERR "SRAT: No NUMA node hash function found. Contact maintainer\n"); bad_srat(); return -1; } /* Finally register nodes */ for_each_node_mask(i, nodes_parsed) setup_node_bootmem(i, nodes[i].start, nodes[i].end); for (i = 0; i < NR_CPUS; i++) { if (cpu_to_node[i] == NUMA_NO_NODE) continue; if (!node_isset(cpu_to_node[i], nodes_parsed)) numa_set_node(i, NUMA_NO_NODE); } numa_init_array(); return 0; } static int node_to_pxm(int n) { int i; if (pxm2node[n] == n) return n; for (i = 0; i < 256; i++) if (pxm2node[i] == n) return i; return 0; } int __node_distance(int a, int b) { int index; if (!acpi_slit) return a == b ? 10 : 20; index = acpi_slit->localities * node_to_pxm(a); return acpi_slit->entry[index + node_to_pxm(b)]; } EXPORT_SYMBOL(__node_distance);