| 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 | * apicid, cpu, node mappings |
| 30 | */ |
| 31 | s16 __apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = { |
| 32 | [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE |
| 33 | }; |
| 34 | |
| 35 | cpumask_var_t node_to_cpumask_map[MAX_NUMNODES]; |
| 36 | EXPORT_SYMBOL(node_to_cpumask_map); |
| 37 | |
| 38 | /* |
| 39 | * Map cpu index to node index |
| 40 | */ |
| 41 | #ifdef CONFIG_X86_32 |
| 42 | DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, 0); |
| 43 | #else |
| 44 | DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE); |
| 45 | #endif |
| 46 | EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map); |
| 47 | |
| 48 | void __cpuinit numa_set_node(int cpu, int node) |
| 49 | { |
| 50 | int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map); |
| 51 | |
| 52 | /* early setting, no percpu area yet */ |
| 53 | if (cpu_to_node_map) { |
| 54 | cpu_to_node_map[cpu] = node; |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| 59 | if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) { |
| 60 | printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu); |
| 61 | dump_stack(); |
| 62 | return; |
| 63 | } |
| 64 | #endif |
| 65 | per_cpu(x86_cpu_to_node_map, cpu) = node; |
| 66 | |
| 67 | if (node != NUMA_NO_NODE) |
| 68 | set_cpu_numa_node(cpu, node); |
| 69 | } |
| 70 | |
| 71 | void __cpuinit numa_clear_node(int cpu) |
| 72 | { |
| 73 | numa_set_node(cpu, NUMA_NO_NODE); |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Allocate node_to_cpumask_map based on number of available nodes |
| 78 | * Requires node_possible_map to be valid. |
| 79 | * |
| 80 | * Note: node_to_cpumask() is not valid until after this is done. |
| 81 | * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.) |
| 82 | */ |
| 83 | void __init setup_node_to_cpumask_map(void) |
| 84 | { |
| 85 | unsigned int node, num = 0; |
| 86 | |
| 87 | /* setup nr_node_ids if not done yet */ |
| 88 | if (nr_node_ids == MAX_NUMNODES) { |
| 89 | for_each_node_mask(node, node_possible_map) |
| 90 | num = node; |
| 91 | nr_node_ids = num + 1; |
| 92 | } |
| 93 | |
| 94 | /* allocate the map */ |
| 95 | for (node = 0; node < nr_node_ids; node++) |
| 96 | alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); |
| 97 | |
| 98 | /* cpumask_of_node() will now work */ |
| 99 | pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids); |
| 100 | } |
| 101 | |
| 102 | #ifndef CONFIG_DEBUG_PER_CPU_MAPS |
| 103 | |
| 104 | # ifndef CONFIG_NUMA_EMU |
| 105 | void __cpuinit numa_add_cpu(int cpu) |
| 106 | { |
| 107 | cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]); |
| 108 | } |
| 109 | |
| 110 | void __cpuinit numa_remove_cpu(int cpu) |
| 111 | { |
| 112 | cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]); |
| 113 | } |
| 114 | # endif /* !CONFIG_NUMA_EMU */ |
| 115 | |
| 116 | #else /* !CONFIG_DEBUG_PER_CPU_MAPS */ |
| 117 | |
| 118 | int __cpu_to_node(int cpu) |
| 119 | { |
| 120 | if (early_per_cpu_ptr(x86_cpu_to_node_map)) { |
| 121 | printk(KERN_WARNING |
| 122 | "cpu_to_node(%d): usage too early!\n", cpu); |
| 123 | dump_stack(); |
| 124 | return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu]; |
| 125 | } |
| 126 | return per_cpu(x86_cpu_to_node_map, cpu); |
| 127 | } |
| 128 | EXPORT_SYMBOL(__cpu_to_node); |
| 129 | |
| 130 | /* |
| 131 | * Same function as cpu_to_node() but used if called before the |
| 132 | * per_cpu areas are setup. |
| 133 | */ |
| 134 | int early_cpu_to_node(int cpu) |
| 135 | { |
| 136 | if (early_per_cpu_ptr(x86_cpu_to_node_map)) |
| 137 | return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu]; |
| 138 | |
| 139 | if (!cpu_possible(cpu)) { |
| 140 | printk(KERN_WARNING |
| 141 | "early_cpu_to_node(%d): no per_cpu area!\n", cpu); |
| 142 | dump_stack(); |
| 143 | return NUMA_NO_NODE; |
| 144 | } |
| 145 | return per_cpu(x86_cpu_to_node_map, cpu); |
| 146 | } |
| 147 | |
| 148 | struct cpumask __cpuinit *debug_cpumask_set_cpu(int cpu, int enable) |
| 149 | { |
| 150 | int node = early_cpu_to_node(cpu); |
| 151 | struct cpumask *mask; |
| 152 | char buf[64]; |
| 153 | |
| 154 | mask = node_to_cpumask_map[node]; |
| 155 | if (!mask) { |
| 156 | pr_err("node_to_cpumask_map[%i] NULL\n", node); |
| 157 | dump_stack(); |
| 158 | return NULL; |
| 159 | } |
| 160 | |
| 161 | cpulist_scnprintf(buf, sizeof(buf), mask); |
| 162 | printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n", |
| 163 | enable ? "numa_add_cpu" : "numa_remove_cpu", |
| 164 | cpu, node, buf); |
| 165 | return mask; |
| 166 | } |
| 167 | |
| 168 | # ifndef CONFIG_NUMA_EMU |
| 169 | static void __cpuinit numa_set_cpumask(int cpu, int enable) |
| 170 | { |
| 171 | struct cpumask *mask; |
| 172 | |
| 173 | mask = debug_cpumask_set_cpu(cpu, enable); |
| 174 | if (!mask) |
| 175 | return; |
| 176 | |
| 177 | if (enable) |
| 178 | cpumask_set_cpu(cpu, mask); |
| 179 | else |
| 180 | cpumask_clear_cpu(cpu, mask); |
| 181 | } |
| 182 | |
| 183 | void __cpuinit numa_add_cpu(int cpu) |
| 184 | { |
| 185 | numa_set_cpumask(cpu, 1); |
| 186 | } |
| 187 | |
| 188 | void __cpuinit numa_remove_cpu(int cpu) |
| 189 | { |
| 190 | numa_set_cpumask(cpu, 0); |
| 191 | } |
| 192 | # endif /* !CONFIG_NUMA_EMU */ |
| 193 | |
| 194 | /* |
| 195 | * Returns a pointer to the bitmask of CPUs on Node 'node'. |
| 196 | */ |
| 197 | const struct cpumask *cpumask_of_node(int node) |
| 198 | { |
| 199 | if (node >= nr_node_ids) { |
| 200 | printk(KERN_WARNING |
| 201 | "cpumask_of_node(%d): node > nr_node_ids(%d)\n", |
| 202 | node, nr_node_ids); |
| 203 | dump_stack(); |
| 204 | return cpu_none_mask; |
| 205 | } |
| 206 | if (node_to_cpumask_map[node] == NULL) { |
| 207 | printk(KERN_WARNING |
| 208 | "cpumask_of_node(%d): no node_to_cpumask_map!\n", |
| 209 | node); |
| 210 | dump_stack(); |
| 211 | return cpu_online_mask; |
| 212 | } |
| 213 | return node_to_cpumask_map[node]; |
| 214 | } |
| 215 | EXPORT_SYMBOL(cpumask_of_node); |
| 216 | |
| 217 | #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */ |