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 set_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 set_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 set_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)
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);
293 printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
296 if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)) {
298 if (!node_test_and_set(node, nodes_parsed)) {
302 if (start < nd->start)
308 update_nodes_add(node, start, end);
310 node_memblk_range[num_node_memblks].start = start;
311 node_memblk_range[num_node_memblks].end = end;
312 memblk_nodeid[num_node_memblks] = node;
316 /* Sanity check to catch more bad SRATs (they are amazingly common).
317 Make sure the PXMs cover all memory. */
318 static int __init nodes_cover_memory(const struct bootnode *nodes)
321 unsigned long pxmram, e820ram;
324 for_each_node_mask(i, nodes_parsed) {
325 unsigned long s = nodes[i].start >> PAGE_SHIFT;
326 unsigned long e = nodes[i].end >> PAGE_SHIFT;
328 pxmram -= __absent_pages_in_range(i, s, e);
329 if ((long)pxmram < 0)
333 e820ram = max_pfn - (memblock_x86_hole_size(0, max_pfn<<PAGE_SHIFT)>>PAGE_SHIFT);
334 /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
335 if ((long)(e820ram - pxmram) >= (1<<(20 - PAGE_SHIFT))) {
337 "SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n",
338 (pxmram << PAGE_SHIFT) >> 20,
339 (e820ram << PAGE_SHIFT) >> 20);
345 void __init acpi_numa_arch_fixup(void) {}
347 #ifdef CONFIG_NUMA_EMU
348 void __init acpi_get_nodes(struct bootnode *physnodes, unsigned long start,
353 for_each_node_mask(i, nodes_parsed) {
354 cutoff_node(i, start, end);
355 physnodes[i].start = nodes[i].start;
356 physnodes[i].end = nodes[i].end;
359 #endif /* CONFIG_NUMA_EMU */
361 /* Use the information discovered above to actually set up the nodes. */
362 int __init acpi_scan_nodes(void)
369 /* First clean up the node list */
370 for (i = 0; i < MAX_NUMNODES; i++)
371 cutoff_node(i, 0, max_pfn << PAGE_SHIFT);
374 * Join together blocks on the same node, holes between
375 * which don't overlap with memory on other nodes.
377 for (i = 0; i < num_node_memblks; ++i) {
380 for (j = i + 1; j < num_node_memblks; ++j) {
381 unsigned long start, end;
383 if (memblk_nodeid[i] != memblk_nodeid[j])
385 start = min(node_memblk_range[i].end,
386 node_memblk_range[j].end);
387 end = max(node_memblk_range[i].start,
388 node_memblk_range[j].start);
389 for (k = 0; k < num_node_memblks; ++k) {
390 if (memblk_nodeid[i] == memblk_nodeid[k])
392 if (start < node_memblk_range[k].end &&
393 end > node_memblk_range[k].start)
396 if (k < num_node_memblks)
398 start = min(node_memblk_range[i].start,
399 node_memblk_range[j].start);
400 end = max(node_memblk_range[i].end,
401 node_memblk_range[j].end);
402 printk(KERN_INFO "SRAT: Node %d "
403 "[%Lx,%Lx) + [%Lx,%Lx) -> [%lx,%lx)\n",
405 node_memblk_range[i].start,
406 node_memblk_range[i].end,
407 node_memblk_range[j].start,
408 node_memblk_range[j].end,
410 node_memblk_range[i].start = start;
411 node_memblk_range[i].end = end;
412 k = --num_node_memblks - j;
413 memmove(memblk_nodeid + j, memblk_nodeid + j+1,
414 k * sizeof(*memblk_nodeid));
415 memmove(node_memblk_range + j, node_memblk_range + j+1,
416 k * sizeof(*node_memblk_range));
421 memnode_shift = compute_hash_shift(node_memblk_range, num_node_memblks,
423 if (memnode_shift < 0) {
425 "SRAT: No NUMA node hash function found. Contact maintainer\n");
430 for (i = 0; i < num_node_memblks; i++)
431 memblock_x86_register_active_regions(memblk_nodeid[i],
432 node_memblk_range[i].start >> PAGE_SHIFT,
433 node_memblk_range[i].end >> PAGE_SHIFT);
435 /* for out of order entries in SRAT */
437 if (!nodes_cover_memory(nodes)) {
442 init_memory_mapping_high();
444 /* Account for nodes with cpus and no memory */
445 nodes_or(node_possible_map, nodes_parsed, cpu_nodes_parsed);
447 /* Finally register nodes */
448 for_each_node_mask(i, node_possible_map)
449 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
450 /* Try again in case setup_node_bootmem missed one due
451 to missing bootmem */
452 for_each_node_mask(i, node_possible_map)
454 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
456 for (i = 0; i < nr_cpu_ids; i++) {
457 int node = early_cpu_to_node(i);
459 if (node == NUMA_NO_NODE)
461 if (!node_online(node))
468 #ifdef CONFIG_NUMA_EMU
469 static int fake_node_to_pxm_map[MAX_NUMNODES] __initdata = {
470 [0 ... MAX_NUMNODES-1] = PXM_INVAL
472 static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
473 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
475 static int __init find_node_by_addr(unsigned long addr)
477 int ret = NUMA_NO_NODE;
480 for_each_node_mask(i, nodes_parsed) {
482 * Find the real node that this emulated node appears on. For
483 * the sake of simplicity, we only use a real node's starting
484 * address to determine which emulated node it appears on.
486 if (addr >= nodes[i].start && addr < nodes[i].end) {
495 * In NUMA emulation, we need to setup proximity domain (_PXM) to node ID
496 * mappings that respect the real ACPI topology but reflect our emulated
497 * environment. For each emulated node, we find which real node it appears on
498 * and create PXM to NID mappings for those fake nodes which mirror that
499 * locality. SLIT will now represent the correct distances between emulated
500 * nodes as a result of the real topology.
502 void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
506 for (i = 0; i < num_nodes; i++) {
509 nid = find_node_by_addr(fake_nodes[i].start);
510 if (nid == NUMA_NO_NODE)
512 pxm = node_to_pxm(nid);
513 if (pxm == PXM_INVAL)
515 fake_node_to_pxm_map[i] = pxm;
517 * For each apicid_to_node mapping that exists for this real
518 * node, it must now point to the fake node ID.
520 for (j = 0; j < MAX_LOCAL_APIC; j++)
521 if (__apicid_to_node[j] == nid &&
522 fake_apicid_to_node[j] == NUMA_NO_NODE)
523 fake_apicid_to_node[j] = i;
527 * If there are apicid-to-node mappings for physical nodes that do not
528 * have a corresponding emulated node, it should default to a guaranteed
531 for (i = 0; i < MAX_LOCAL_APIC; i++)
532 if (__apicid_to_node[i] != NUMA_NO_NODE &&
533 fake_apicid_to_node[i] == NUMA_NO_NODE)
534 fake_apicid_to_node[i] = 0;
536 for (i = 0; i < num_nodes; i++)
537 __acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
538 memcpy(__apicid_to_node, fake_apicid_to_node, sizeof(__apicid_to_node));
540 nodes_clear(nodes_parsed);
541 for (i = 0; i < num_nodes; i++)
542 if (fake_nodes[i].start != fake_nodes[i].end)
543 node_set(i, nodes_parsed);
546 static int null_slit_node_compare(int a, int b)
548 return node_to_pxm(a) == node_to_pxm(b);
551 static int null_slit_node_compare(int a, int b)
555 #endif /* CONFIG_NUMA_EMU */
557 int __node_distance(int a, int b)
562 return null_slit_node_compare(a, b) ? LOCAL_DISTANCE :
564 index = acpi_slit->locality_count * node_to_pxm(a);
565 return acpi_slit->entry[index + node_to_pxm(b)];
568 EXPORT_SYMBOL(__node_distance);
570 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || defined(CONFIG_ACPI_HOTPLUG_MEMORY)
571 int memory_add_physaddr_to_nid(u64 start)
576 if (nodes_add[i].start <= start && nodes_add[i].end > start)
581 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);