1 /* Common code for 32 and 64-bit NUMA */ 2 #include <linux/topology.h> 3 #include <linux/module.h> 4 #include <linux/bootmem.h> 5 #include <asm/numa.h> 6 #include <asm/acpi.h> 7 8 int __initdata numa_off; 9 10 static __init int numa_setup(char *opt) 11 { 12 if (!opt) 13 return -EINVAL; 14 if (!strncmp(opt, "off", 3)) 15 numa_off = 1; 16 #ifdef CONFIG_NUMA_EMU 17 if (!strncmp(opt, "fake=", 5)) 18 numa_emu_cmdline(opt + 5); 19 #endif 20 #ifdef CONFIG_ACPI_NUMA 21 if (!strncmp(opt, "noacpi", 6)) 22 acpi_numa = -1; 23 #endif 24 return 0; 25 } 26 early_param("numa", numa_setup); 27 28 /* 29 * Which logical CPUs are on which nodes 30 */ 31 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES]; 32 EXPORT_SYMBOL(node_to_cpumask_map); 33 34 /* 35 * Allocate node_to_cpumask_map based on number of available nodes 36 * Requires node_possible_map to be valid. 37 * 38 * Note: node_to_cpumask() is not valid until after this is done. 39 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.) 40 */ 41 void __init setup_node_to_cpumask_map(void) 42 { 43 unsigned int node, num = 0; 44 45 /* setup nr_node_ids if not done yet */ 46 if (nr_node_ids == MAX_NUMNODES) { 47 for_each_node_mask(node, node_possible_map) 48 num = node; 49 nr_node_ids = num + 1; 50 } 51 52 /* allocate the map */ 53 for (node = 0; node < nr_node_ids; node++) 54 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); 55 56 /* cpumask_of_node() will now work */ 57 pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids); 58 } 59 60 #ifdef CONFIG_DEBUG_PER_CPU_MAPS 61 /* 62 * Returns a pointer to the bitmask of CPUs on Node 'node'. 63 */ 64 const struct cpumask *cpumask_of_node(int node) 65 { 66 if (node >= nr_node_ids) { 67 printk(KERN_WARNING 68 "cpumask_of_node(%d): node > nr_node_ids(%d)\n", 69 node, nr_node_ids); 70 dump_stack(); 71 return cpu_none_mask; 72 } 73 if (node_to_cpumask_map[node] == NULL) { 74 printk(KERN_WARNING 75 "cpumask_of_node(%d): no node_to_cpumask_map!\n", 76 node); 77 dump_stack(); 78 return cpu_online_mask; 79 } 80 return node_to_cpumask_map[node]; 81 } 82 EXPORT_SYMBOL(cpumask_of_node); 83 #endif 84