4 * Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 #include <linux/threads.h>
12 #include <linux/bootmem.h>
13 #include <linux/init.h>
15 #include <linux/mmzone.h>
16 #include <linux/module.h>
17 #include <linux/nodemask.h>
18 #include <linux/cpu.h>
19 #include <linux/notifier.h>
21 #include <asm/machdep.h>
22 #include <asm/abs_addr.h>
24 static int numa_enabled = 1;
26 static int numa_debug;
27 #define dbg(args...) if (numa_debug) { printk(KERN_INFO args); }
30 #define ARRAY_INITIALISER -1
32 #define ARRAY_INITIALISER 0
35 int numa_cpu_lookup_table[NR_CPUS] = { [ 0 ... (NR_CPUS - 1)] =
37 char *numa_memory_lookup_table;
38 cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES];
39 int nr_cpus_in_node[MAX_NUMNODES] = { [0 ... (MAX_NUMNODES -1)] = 0};
41 struct pglist_data *node_data[MAX_NUMNODES];
42 bootmem_data_t __initdata plat_node_bdata[MAX_NUMNODES];
43 static unsigned long node0_io_hole_size;
44 static int min_common_depth;
47 * We need somewhere to store start/span for each node until we have
48 * allocated the real node_data structures.
51 unsigned long node_start_pfn;
52 unsigned long node_spanned_pages;
53 } init_node_data[MAX_NUMNODES] __initdata;
55 EXPORT_SYMBOL(node_data);
56 EXPORT_SYMBOL(numa_cpu_lookup_table);
57 EXPORT_SYMBOL(numa_memory_lookup_table);
58 EXPORT_SYMBOL(numa_cpumask_lookup_table);
59 EXPORT_SYMBOL(nr_cpus_in_node);
61 static inline void map_cpu_to_node(int cpu, int node)
63 numa_cpu_lookup_table[cpu] = node;
64 if (!(cpu_isset(cpu, numa_cpumask_lookup_table[node]))) {
65 cpu_set(cpu, numa_cpumask_lookup_table[node]);
66 nr_cpus_in_node[node]++;
70 #ifdef CONFIG_HOTPLUG_CPU
71 static void unmap_cpu_from_node(unsigned long cpu)
73 int node = numa_cpu_lookup_table[cpu];
75 dbg("removing cpu %lu from node %d\n", cpu, node);
77 if (cpu_isset(cpu, numa_cpumask_lookup_table[node])) {
78 cpu_clear(cpu, numa_cpumask_lookup_table[node]);
79 nr_cpus_in_node[node]--;
81 printk(KERN_ERR "WARNING: cpu %lu not found in node %d\n",
85 #endif /* CONFIG_HOTPLUG_CPU */
87 static struct device_node * __devinit find_cpu_node(unsigned int cpu)
89 unsigned int hw_cpuid = get_hard_smp_processor_id(cpu);
90 struct device_node *cpu_node = NULL;
91 unsigned int *interrupt_server, *reg;
94 while ((cpu_node = of_find_node_by_type(cpu_node, "cpu")) != NULL) {
95 /* Try interrupt server first */
96 interrupt_server = (unsigned int *)get_property(cpu_node,
97 "ibm,ppc-interrupt-server#s", &len);
99 len = len / sizeof(u32);
101 if (interrupt_server && (len > 0)) {
103 if (interrupt_server[len] == hw_cpuid)
107 reg = (unsigned int *)get_property(cpu_node,
109 if (reg && (len > 0) && (reg[0] == hw_cpuid))
117 /* must hold reference to node during call */
118 static int *of_get_associativity(struct device_node *dev)
120 return (unsigned int *)get_property(dev, "ibm,associativity", NULL);
123 static int of_node_numa_domain(struct device_node *device)
128 if (min_common_depth == -1)
131 tmp = of_get_associativity(device);
132 if (tmp && (tmp[0] >= min_common_depth)) {
133 numa_domain = tmp[min_common_depth];
135 dbg("WARNING: no NUMA information for %s\n",
143 * In theory, the "ibm,associativity" property may contain multiple
144 * associativity lists because a resource may be multiply connected
145 * into the machine. This resource then has different associativity
146 * characteristics relative to its multiple connections. We ignore
147 * this for now. We also assume that all cpu and memory sets have
148 * their distances represented at a common level. This won't be
149 * true for heirarchical NUMA.
151 * In any case the ibm,associativity-reference-points should give
152 * the correct depth for a normal NUMA system.
154 * - Dave Hansen <haveblue@us.ibm.com>
156 static int __init find_min_common_depth(void)
159 unsigned int *ref_points;
160 struct device_node *rtas_root;
163 rtas_root = of_find_node_by_path("/rtas");
169 * this property is 2 32-bit integers, each representing a level of
170 * depth in the associativity nodes. The first is for an SMP
171 * configuration (should be all 0's) and the second is for a normal
172 * NUMA configuration.
174 ref_points = (unsigned int *)get_property(rtas_root,
175 "ibm,associativity-reference-points", &len);
177 if ((len >= 1) && ref_points) {
178 depth = ref_points[1];
180 dbg("WARNING: could not find NUMA "
181 "associativity reference point\n");
184 of_node_put(rtas_root);
189 static unsigned long read_cell_ul(struct device_node *device, unsigned int **buf)
192 unsigned long result = 0;
194 i = prom_n_size_cells(device);
197 result = (result << 32) | **buf;
204 * Figure out to which domain a cpu belongs and stick it there.
205 * Return the id of the domain used.
207 static int numa_setup_cpu(unsigned long lcpu)
210 struct device_node *cpu = find_cpu_node(lcpu);
217 numa_domain = of_node_numa_domain(cpu);
219 if (numa_domain >= num_online_nodes()) {
221 * POWER4 LPAR uses 0xffff as invalid node,
222 * dont warn in this case.
224 if (numa_domain != 0xffff)
225 printk(KERN_ERR "WARNING: cpu %ld "
226 "maps to invalid NUMA node %d\n",
231 node_set_online(numa_domain);
233 map_cpu_to_node(lcpu, numa_domain);
240 static int cpu_numa_callback(struct notifier_block *nfb,
241 unsigned long action,
244 unsigned long lcpu = (unsigned long)hcpu;
245 int ret = NOTIFY_DONE;
249 if (min_common_depth == -1 || !numa_enabled)
250 map_cpu_to_node(lcpu, 0);
252 numa_setup_cpu(lcpu);
255 #ifdef CONFIG_HOTPLUG_CPU
257 case CPU_UP_CANCELED:
258 unmap_cpu_from_node(lcpu);
266 static int __init parse_numa_properties(void)
268 struct device_node *cpu = NULL;
269 struct device_node *memory = NULL;
271 long entries = lmb_end_of_DRAM() >> MEMORY_INCREMENT_SHIFT;
274 if (numa_enabled == 0) {
275 printk(KERN_WARNING "NUMA disabled by user\n");
279 numa_memory_lookup_table =
280 (char *)abs_to_virt(lmb_alloc(entries * sizeof(char), 1));
281 memset(numa_memory_lookup_table, 0, entries * sizeof(char));
283 for (i = 0; i < entries ; i++)
284 numa_memory_lookup_table[i] = ARRAY_INITIALISER;
286 min_common_depth = find_min_common_depth();
288 dbg("NUMA associativity depth for CPU/Memory: %d\n", min_common_depth);
289 if (min_common_depth < 0)
290 return min_common_depth;
292 max_domain = numa_setup_cpu(boot_cpuid);
295 * Even though we connect cpus to numa domains later in SMP init,
296 * we need to know the maximum node id now. This is because each
297 * node id must have NODE_DATA etc backing it.
298 * As a result of hotplug we could still have cpus appear later on
299 * with larger node ids. In that case we force the cpu into node 0.
304 cpu = find_cpu_node(i);
307 numa_domain = of_node_numa_domain(cpu);
310 if (numa_domain < MAX_NUMNODES &&
311 max_domain < numa_domain)
312 max_domain = numa_domain;
317 while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
322 unsigned int *memcell_buf;
325 memcell_buf = (unsigned int *)get_property(memory, "reg", &len);
326 if (!memcell_buf || len <= 0)
329 ranges = memory->n_addrs;
331 /* these are order-sensitive, and modify the buffer pointer */
332 start = read_cell_ul(memory, &memcell_buf);
333 size = read_cell_ul(memory, &memcell_buf);
335 start = _ALIGN_DOWN(start, MEMORY_INCREMENT);
336 size = _ALIGN_UP(size, MEMORY_INCREMENT);
338 numa_domain = of_node_numa_domain(memory);
340 if (numa_domain >= MAX_NUMNODES) {
341 if (numa_domain != 0xffff)
342 printk(KERN_ERR "WARNING: memory at %lx maps "
343 "to invalid NUMA node %d\n", start,
348 if (max_domain < numa_domain)
349 max_domain = numa_domain;
352 * For backwards compatibility, OF splits the first node
353 * into two regions (the first being 0-4GB). Check for
354 * this simple case and complain if there is a gap in
357 if (init_node_data[numa_domain].node_spanned_pages) {
358 unsigned long shouldstart =
359 init_node_data[numa_domain].node_start_pfn +
360 init_node_data[numa_domain].node_spanned_pages;
361 if (shouldstart != (start / PAGE_SIZE)) {
362 /* Revert to non-numa for now */
364 "WARNING: Unexpected node layout: "
365 "region start %lx length %lx\n",
367 printk(KERN_ERR "NUMA is disabled\n");
370 init_node_data[numa_domain].node_spanned_pages +=
373 node_set_online(numa_domain);
375 init_node_data[numa_domain].node_start_pfn =
377 init_node_data[numa_domain].node_spanned_pages =
381 for (i = start ; i < (start+size); i += MEMORY_INCREMENT)
382 numa_memory_lookup_table[i >> MEMORY_INCREMENT_SHIFT] =
390 for (i = 0; i <= max_domain; i++)
395 /* Something has gone wrong; revert any setup we've done */
398 init_node_data[i].node_start_pfn = 0;
399 init_node_data[i].node_spanned_pages = 0;
404 static void __init setup_nonnuma(void)
406 unsigned long top_of_ram = lmb_end_of_DRAM();
407 unsigned long total_ram = lmb_phys_mem_size();
410 printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
411 top_of_ram, total_ram);
412 printk(KERN_INFO "Memory hole size: %ldMB\n",
413 (top_of_ram - total_ram) >> 20);
415 if (!numa_memory_lookup_table) {
416 long entries = top_of_ram >> MEMORY_INCREMENT_SHIFT;
417 numa_memory_lookup_table =
418 (char *)abs_to_virt(lmb_alloc(entries * sizeof(char), 1));
419 memset(numa_memory_lookup_table, 0, entries * sizeof(char));
420 for (i = 0; i < entries ; i++)
421 numa_memory_lookup_table[i] = ARRAY_INITIALISER;
424 map_cpu_to_node(boot_cpuid, 0);
428 init_node_data[0].node_start_pfn = 0;
429 init_node_data[0].node_spanned_pages = lmb_end_of_DRAM() / PAGE_SIZE;
431 for (i = 0 ; i < top_of_ram; i += MEMORY_INCREMENT)
432 numa_memory_lookup_table[i >> MEMORY_INCREMENT_SHIFT] = 0;
434 node0_io_hole_size = top_of_ram - total_ram;
437 static void __init dump_numa_topology(void)
442 if (min_common_depth == -1 || !numa_enabled)
445 for_each_online_node(node) {
448 printk(KERN_INFO "Node %d Memory:", node);
452 for (i = 0; i < lmb_end_of_DRAM(); i += MEMORY_INCREMENT) {
453 if (numa_memory_lookup_table[i >> MEMORY_INCREMENT_SHIFT] == node) {
472 * Allocate some memory, satisfying the lmb or bootmem allocator where
473 * required. nid is the preferred node and end is the physical address of
474 * the highest address in the node.
476 * Returns the physical address of the memory.
478 static unsigned long careful_allocation(int nid, unsigned long size,
479 unsigned long align, unsigned long end)
481 unsigned long ret = lmb_alloc_base(size, align, end);
483 /* retry over all memory */
485 ret = lmb_alloc_base(size, align, lmb_end_of_DRAM());
488 panic("numa.c: cannot allocate %lu bytes on node %d",
492 * If the memory came from a previously allocated node, we must
493 * retry with the bootmem allocator.
495 if (pa_to_nid(ret) < nid) {
496 nid = pa_to_nid(ret);
497 ret = (unsigned long)__alloc_bootmem_node(NODE_DATA(nid),
501 panic("numa.c: cannot allocate %lu bytes on node %d",
504 ret = virt_to_abs(ret);
506 dbg("alloc_bootmem %lx %lx\n", ret, size);
512 void __init do_init_bootmem(void)
515 static struct notifier_block ppc64_numa_nb = {
516 .notifier_call = cpu_numa_callback,
517 .priority = 1 /* Must run before sched domains notifier. */
521 max_low_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
522 max_pfn = max_low_pfn;
524 if (parse_numa_properties())
527 dump_numa_topology();
529 register_cpu_notifier(&ppc64_numa_nb);
531 for_each_online_node(nid) {
532 unsigned long start_paddr, end_paddr;
534 unsigned long bootmem_paddr;
535 unsigned long bootmap_pages;
537 start_paddr = init_node_data[nid].node_start_pfn * PAGE_SIZE;
538 end_paddr = start_paddr + (init_node_data[nid].node_spanned_pages * PAGE_SIZE);
540 /* Allocate the node structure node local if possible */
541 NODE_DATA(nid) = (struct pglist_data *)careful_allocation(nid,
542 sizeof(struct pglist_data),
543 SMP_CACHE_BYTES, end_paddr);
544 NODE_DATA(nid) = abs_to_virt(NODE_DATA(nid));
545 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
547 dbg("node %d\n", nid);
548 dbg("NODE_DATA() = %p\n", NODE_DATA(nid));
550 NODE_DATA(nid)->bdata = &plat_node_bdata[nid];
551 NODE_DATA(nid)->node_start_pfn =
552 init_node_data[nid].node_start_pfn;
553 NODE_DATA(nid)->node_spanned_pages =
554 init_node_data[nid].node_spanned_pages;
556 if (init_node_data[nid].node_spanned_pages == 0)
559 dbg("start_paddr = %lx\n", start_paddr);
560 dbg("end_paddr = %lx\n", end_paddr);
562 bootmap_pages = bootmem_bootmap_pages((end_paddr - start_paddr) >> PAGE_SHIFT);
564 bootmem_paddr = careful_allocation(nid,
565 bootmap_pages << PAGE_SHIFT,
566 PAGE_SIZE, end_paddr);
567 memset(abs_to_virt(bootmem_paddr), 0,
568 bootmap_pages << PAGE_SHIFT);
569 dbg("bootmap_paddr = %lx\n", bootmem_paddr);
571 init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
572 start_paddr >> PAGE_SHIFT,
573 end_paddr >> PAGE_SHIFT);
575 for (i = 0; i < lmb.memory.cnt; i++) {
576 unsigned long physbase, size;
578 physbase = lmb.memory.region[i].physbase;
579 size = lmb.memory.region[i].size;
581 if (physbase < end_paddr &&
582 (physbase+size) > start_paddr) {
584 if (physbase < start_paddr) {
585 size -= start_paddr - physbase;
586 physbase = start_paddr;
589 if (size > end_paddr - physbase)
590 size = end_paddr - physbase;
592 dbg("free_bootmem %lx %lx\n", physbase, size);
593 free_bootmem_node(NODE_DATA(nid), physbase,
598 for (i = 0; i < lmb.reserved.cnt; i++) {
599 unsigned long physbase = lmb.reserved.region[i].physbase;
600 unsigned long size = lmb.reserved.region[i].size;
602 if (physbase < end_paddr &&
603 (physbase+size) > start_paddr) {
605 if (physbase < start_paddr) {
606 size -= start_paddr - physbase;
607 physbase = start_paddr;
610 if (size > end_paddr - physbase)
611 size = end_paddr - physbase;
613 dbg("reserve_bootmem %lx %lx\n", physbase,
615 reserve_bootmem_node(NODE_DATA(nid), physbase,
622 void __init paging_init(void)
624 unsigned long zones_size[MAX_NR_ZONES];
625 unsigned long zholes_size[MAX_NR_ZONES];
628 memset(zones_size, 0, sizeof(zones_size));
629 memset(zholes_size, 0, sizeof(zholes_size));
631 for_each_online_node(nid) {
632 unsigned long start_pfn;
633 unsigned long end_pfn;
635 start_pfn = plat_node_bdata[nid].node_boot_start >> PAGE_SHIFT;
636 end_pfn = plat_node_bdata[nid].node_low_pfn;
638 zones_size[ZONE_DMA] = end_pfn - start_pfn;
639 zholes_size[ZONE_DMA] = 0;
641 zholes_size[ZONE_DMA] = node0_io_hole_size >> PAGE_SHIFT;
643 dbg("free_area_init node %d %lx %lx (hole: %lx)\n", nid,
644 zones_size[ZONE_DMA], start_pfn, zholes_size[ZONE_DMA]);
646 free_area_init_node(nid, NODE_DATA(nid), zones_size,
647 start_pfn, zholes_size);
651 static int __init early_numa(char *p)
656 if (strstr(p, "off"))
659 if (strstr(p, "debug"))
664 early_param("numa", early_numa);