2 * ACPI 3.0 based NUMA setup
3 * Copyright 2004 Andi Kleen, SuSE Labs.
5 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
7 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
8 * Assumes all memory regions belonging to a single proximity domain
9 * are in one chunk. Holes between them will be included in the node.
12 #include <linux/kernel.h>
13 #include <linux/acpi.h>
14 #include <linux/mmzone.h>
15 #include <linux/bitmap.h>
16 #include <linux/module.h>
17 #include <linux/topology.h>
18 #include <linux/bootmem.h>
19 #include <linux/memblock.h>
21 #include <asm/proto.h>
25 #include <asm/uv/uv.h>
27 int acpi_numa __initdata;
29 static struct acpi_table_slit *acpi_slit;
31 static nodemask_t nodes_parsed __initdata;
32 static nodemask_t cpu_nodes_parsed __initdata;
33 static struct bootnode nodes[MAX_NUMNODES] __initdata;
34 static struct bootnode nodes_add[MAX_NUMNODES];
36 static int num_node_memblks __initdata;
37 static struct bootnode node_memblk_range[NR_NODE_MEMBLKS] __initdata;
38 static int memblk_nodeid[NR_NODE_MEMBLKS] __initdata;
40 static __init int setup_node(int pxm)
42 return acpi_map_pxm_to_node(pxm);
45 static __init int conflicting_memblks(unsigned long start, unsigned long end)
48 for (i = 0; i < num_node_memblks; i++) {
49 struct bootnode *nd = &node_memblk_range[i];
50 if (nd->start == nd->end)
52 if (nd->end > start && nd->start < end)
53 return memblk_nodeid[i];
54 if (nd->end == end && nd->start == start)
55 return memblk_nodeid[i];
60 static __init void cutoff_node(int i, unsigned long start, unsigned long end)
62 struct bootnode *nd = &nodes[i];
64 if (nd->start < start) {
66 if (nd->end < nd->start)
71 if (nd->start > nd->end)
76 static __init void bad_srat(void)
79 printk(KERN_ERR "SRAT: SRAT not used.\n");
81 for (i = 0; i < MAX_LOCAL_APIC; i++)
82 apicid_to_node[i] = NUMA_NO_NODE;
83 for (i = 0; i < MAX_NUMNODES; i++) {
84 nodes[i].start = nodes[i].end = 0;
85 nodes_add[i].start = nodes_add[i].end = 0;
87 remove_all_active_ranges();
90 static __init inline int srat_disabled(void)
92 return numa_off || acpi_numa < 0;
95 /* Callback for SLIT parsing */
96 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
101 length = slit->header.length;
102 phys = memblock_find_in_range(0, max_pfn_mapped<<PAGE_SHIFT, length,
105 if (phys == MEMBLOCK_ERROR)
106 panic(" Can not save slit!\n");
108 acpi_slit = __va(phys);
109 memcpy(acpi_slit, slit, length);
110 memblock_x86_reserve_range(phys, phys + length, "ACPI SLIT");
113 /* Callback for Proximity Domain -> x2APIC mapping */
115 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
122 if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
126 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
128 pxm = pa->proximity_domain;
129 node = setup_node(pxm);
131 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
136 apic_id = pa->apic_id;
137 if (apic_id >= MAX_LOCAL_APIC) {
138 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
141 apicid_to_node[apic_id] = node;
142 node_set(node, cpu_nodes_parsed);
144 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
148 /* Callback for Proximity Domain -> LAPIC mapping */
150 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
157 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
161 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
163 pxm = pa->proximity_domain_lo;
164 node = setup_node(pxm);
166 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
171 if (get_uv_system_type() >= UV_X2APIC)
172 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
174 apic_id = pa->apic_id;
176 if (apic_id >= MAX_LOCAL_APIC) {
177 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
181 apicid_to_node[apic_id] = node;
182 node_set(node, cpu_nodes_parsed);
184 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
188 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
189 static inline int save_add_info(void) {return 1;}
191 static inline int save_add_info(void) {return 0;}
195 * This code supports one contiguous hot add area per node
198 update_nodes_add(int node, unsigned long start, unsigned long end)
200 unsigned long s_pfn = start >> PAGE_SHIFT;
201 unsigned long e_pfn = end >> PAGE_SHIFT;
203 struct bootnode *nd = &nodes_add[node];
205 /* I had some trouble with strange memory hotadd regions breaking
206 the boot. Be very strict here and reject anything unexpected.
207 If you want working memory hotadd write correct SRATs.
209 The node size check is a basic sanity check to guard against
211 if ((signed long)(end - start) < NODE_MIN_SIZE) {
212 printk(KERN_ERR "SRAT: Hotplug area too small\n");
216 /* This check might be a bit too strict, but I'm keeping it for now. */
217 if (absent_pages_in_range(s_pfn, e_pfn) != e_pfn - s_pfn) {
219 "SRAT: Hotplug area %lu -> %lu has existing memory\n",
226 if (nd->start == nd->end) {
231 if (nd->start == end) {
235 if (nd->end == start) {
240 printk(KERN_ERR "SRAT: Hotplug zone not continuous. Partly ignored\n");
244 node_set(node, cpu_nodes_parsed);
245 printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n",
250 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
252 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
254 struct bootnode *nd, oldnode;
255 unsigned long start, end;
261 if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
265 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
268 if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
270 start = ma->base_address;
271 end = start + ma->length;
272 pxm = ma->proximity_domain;
273 node = setup_node(pxm);
275 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
279 i = conflicting_memblks(start, end);
282 "SRAT: Warning: PXM %d (%lx-%lx) overlaps with itself (%Lx-%Lx)\n",
283 pxm, start, end, nodes[i].start, nodes[i].end);
286 "SRAT: PXM %d (%lx-%lx) overlaps with PXM %d (%Lx-%Lx)\n",
287 pxm, start, end, node_to_pxm(i),
288 nodes[i].start, nodes[i].end);
294 if (!node_test_and_set(node, nodes_parsed)) {
298 if (start < nd->start)
304 printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
307 if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
308 update_nodes_add(node, start, end);
309 /* restore nodes[node] */
311 if ((nd->start | nd->end) == 0)
312 node_clear(node, nodes_parsed);
315 node_memblk_range[num_node_memblks].start = start;
316 node_memblk_range[num_node_memblks].end = end;
317 memblk_nodeid[num_node_memblks] = node;
321 /* Sanity check to catch more bad SRATs (they are amazingly common).
322 Make sure the PXMs cover all memory. */
323 static int __init nodes_cover_memory(const struct bootnode *nodes)
326 unsigned long pxmram, e820ram;
329 for_each_node_mask(i, nodes_parsed) {
330 unsigned long s = nodes[i].start >> PAGE_SHIFT;
331 unsigned long e = nodes[i].end >> PAGE_SHIFT;
333 pxmram -= __absent_pages_in_range(i, s, e);
334 if ((long)pxmram < 0)
338 e820ram = max_pfn - (memblock_x86_hole_size(0, max_pfn<<PAGE_SHIFT)>>PAGE_SHIFT);
339 /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
340 if ((long)(e820ram - pxmram) >= (1<<(20 - PAGE_SHIFT))) {
342 "SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n",
343 (pxmram << PAGE_SHIFT) >> 20,
344 (e820ram << PAGE_SHIFT) >> 20);
350 void __init acpi_numa_arch_fixup(void) {}
352 int __init acpi_get_nodes(struct bootnode *physnodes)
357 for_each_node_mask(i, nodes_parsed) {
358 physnodes[ret].start = nodes[i].start;
359 physnodes[ret].end = nodes[i].end;
365 /* Use the information discovered above to actually set up the nodes. */
366 int __init acpi_scan_nodes(unsigned long start, unsigned long end)
373 /* First clean up the node list */
374 for (i = 0; i < MAX_NUMNODES; i++)
375 cutoff_node(i, start, end);
378 * Join together blocks on the same node, holes between
379 * which don't overlap with memory on other nodes.
381 for (i = 0; i < num_node_memblks; ++i) {
384 for (j = i + 1; j < num_node_memblks; ++j) {
385 unsigned long start, end;
387 if (memblk_nodeid[i] != memblk_nodeid[j])
389 start = min(node_memblk_range[i].end,
390 node_memblk_range[j].end);
391 end = max(node_memblk_range[i].start,
392 node_memblk_range[j].start);
393 for (k = 0; k < num_node_memblks; ++k) {
394 if (memblk_nodeid[i] == memblk_nodeid[k])
396 if (start < node_memblk_range[k].end &&
397 end > node_memblk_range[k].start)
400 if (k < num_node_memblks)
402 start = min(node_memblk_range[i].start,
403 node_memblk_range[j].start);
404 end = max(node_memblk_range[i].end,
405 node_memblk_range[j].end);
406 printk(KERN_INFO "SRAT: Node %d "
407 "[%Lx,%Lx) + [%Lx,%Lx) -> [%lx,%lx)\n",
409 node_memblk_range[i].start,
410 node_memblk_range[i].end,
411 node_memblk_range[j].start,
412 node_memblk_range[j].end,
414 node_memblk_range[i].start = start;
415 node_memblk_range[i].end = end;
416 k = --num_node_memblks - j;
417 memmove(memblk_nodeid + j, memblk_nodeid + j+1,
418 k * sizeof(*memblk_nodeid));
419 memmove(node_memblk_range + j, node_memblk_range + j+1,
420 k * sizeof(*node_memblk_range));
425 memnode_shift = compute_hash_shift(node_memblk_range, num_node_memblks,
427 if (memnode_shift < 0) {
429 "SRAT: No NUMA node hash function found. Contact maintainer\n");
434 for (i = 0; i < num_node_memblks; i++)
435 memblock_x86_register_active_regions(memblk_nodeid[i],
436 node_memblk_range[i].start >> PAGE_SHIFT,
437 node_memblk_range[i].end >> PAGE_SHIFT);
439 /* for out of order entries in SRAT */
441 if (!nodes_cover_memory(nodes)) {
446 /* Account for nodes with cpus and no memory */
447 nodes_or(node_possible_map, nodes_parsed, cpu_nodes_parsed);
449 /* Finally register nodes */
450 for_each_node_mask(i, node_possible_map)
451 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
452 /* Try again in case setup_node_bootmem missed one due
453 to missing bootmem */
454 for_each_node_mask(i, node_possible_map)
456 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
458 for (i = 0; i < nr_cpu_ids; i++) {
459 int node = early_cpu_to_node(i);
461 if (node == NUMA_NO_NODE)
463 if (!node_online(node))
470 #ifdef CONFIG_NUMA_EMU
471 static int fake_node_to_pxm_map[MAX_NUMNODES] __initdata = {
472 [0 ... MAX_NUMNODES-1] = PXM_INVAL
474 static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
475 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
477 static int __init find_node_by_addr(unsigned long addr)
479 int ret = NUMA_NO_NODE;
482 for_each_node_mask(i, nodes_parsed) {
484 * Find the real node that this emulated node appears on. For
485 * the sake of simplicity, we only use a real node's starting
486 * address to determine which emulated node it appears on.
488 if (addr >= nodes[i].start && addr < nodes[i].end) {
497 * In NUMA emulation, we need to setup proximity domain (_PXM) to node ID
498 * mappings that respect the real ACPI topology but reflect our emulated
499 * environment. For each emulated node, we find which real node it appears on
500 * and create PXM to NID mappings for those fake nodes which mirror that
501 * locality. SLIT will now represent the correct distances between emulated
502 * nodes as a result of the real topology.
504 void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
508 printk(KERN_INFO "Faking PXM affinity for fake nodes on real "
510 for (i = 0; i < num_nodes; i++) {
513 nid = find_node_by_addr(fake_nodes[i].start);
514 if (nid == NUMA_NO_NODE)
516 pxm = node_to_pxm(nid);
517 if (pxm == PXM_INVAL)
519 fake_node_to_pxm_map[i] = pxm;
521 * For each apicid_to_node mapping that exists for this real
522 * node, it must now point to the fake node ID.
524 for (j = 0; j < MAX_LOCAL_APIC; j++)
525 if (apicid_to_node[j] == nid &&
526 fake_apicid_to_node[j] == NUMA_NO_NODE)
527 fake_apicid_to_node[j] = i;
529 for (i = 0; i < num_nodes; i++)
530 __acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
531 memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
533 nodes_clear(nodes_parsed);
534 for (i = 0; i < num_nodes; i++)
535 if (fake_nodes[i].start != fake_nodes[i].end)
536 node_set(i, nodes_parsed);
539 static int null_slit_node_compare(int a, int b)
541 return node_to_pxm(a) == node_to_pxm(b);
544 static int null_slit_node_compare(int a, int b)
548 #endif /* CONFIG_NUMA_EMU */
550 int __node_distance(int a, int b)
555 return null_slit_node_compare(a, b) ? LOCAL_DISTANCE :
557 index = acpi_slit->locality_count * node_to_pxm(a);
558 return acpi_slit->entry[index + node_to_pxm(b)];
561 EXPORT_SYMBOL(__node_distance);
563 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || defined(CONFIG_ACPI_HOTPLUG_MEMORY)
564 int memory_add_physaddr_to_nid(u64 start)
569 if (nodes_add[i].start <= start && nodes_add[i].end > start)
574 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);