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>
20 #include <linux/lmb.h>
22 #include <asm/sparsemem.h>
24 #include <asm/system.h>
27 static int numa_enabled = 1;
29 static char *cmdline __initdata;
31 static int numa_debug;
32 #define dbg(args...) if (numa_debug) { printk(KERN_INFO args); }
34 int numa_cpu_lookup_table[NR_CPUS];
35 cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES];
36 struct pglist_data *node_data[MAX_NUMNODES];
38 EXPORT_SYMBOL(numa_cpu_lookup_table);
39 EXPORT_SYMBOL(numa_cpumask_lookup_table);
40 EXPORT_SYMBOL(node_data);
42 static int min_common_depth;
43 static int n_mem_addr_cells, n_mem_size_cells;
45 static int __cpuinit fake_numa_create_new_node(unsigned long end_pfn,
48 unsigned long long mem;
50 static unsigned int fake_nid;
51 static unsigned long long curr_boundary;
54 * Modify node id, iff we started creating NUMA nodes
55 * We want to continue from where we left of the last time
60 * In case there are no more arguments to parse, the
61 * node_id should be the same as the last fake node id
62 * (we've handled this above).
67 mem = memparse(p, &p);
71 if (mem < curr_boundary)
76 if ((end_pfn << PAGE_SHIFT) > mem) {
78 * Skip commas and spaces
80 while (*p == ',' || *p == ' ' || *p == '\t')
86 dbg("created new fake_node with id %d\n", fake_nid);
92 static void __cpuinit map_cpu_to_node(int cpu, int node)
94 numa_cpu_lookup_table[cpu] = node;
96 dbg("adding cpu %d to node %d\n", cpu, node);
98 if (!(cpu_isset(cpu, numa_cpumask_lookup_table[node])))
99 cpu_set(cpu, numa_cpumask_lookup_table[node]);
102 #ifdef CONFIG_HOTPLUG_CPU
103 static void unmap_cpu_from_node(unsigned long cpu)
105 int node = numa_cpu_lookup_table[cpu];
107 dbg("removing cpu %lu from node %d\n", cpu, node);
109 if (cpu_isset(cpu, numa_cpumask_lookup_table[node])) {
110 cpu_clear(cpu, numa_cpumask_lookup_table[node]);
112 printk(KERN_ERR "WARNING: cpu %lu not found in node %d\n",
116 #endif /* CONFIG_HOTPLUG_CPU */
118 static struct device_node * __cpuinit find_cpu_node(unsigned int cpu)
120 unsigned int hw_cpuid = get_hard_smp_processor_id(cpu);
121 struct device_node *cpu_node = NULL;
122 const unsigned int *interrupt_server, *reg;
125 while ((cpu_node = of_find_node_by_type(cpu_node, "cpu")) != NULL) {
126 /* Try interrupt server first */
127 interrupt_server = of_get_property(cpu_node,
128 "ibm,ppc-interrupt-server#s", &len);
130 len = len / sizeof(u32);
132 if (interrupt_server && (len > 0)) {
134 if (interrupt_server[len] == hw_cpuid)
138 reg = of_get_property(cpu_node, "reg", &len);
139 if (reg && (len > 0) && (reg[0] == hw_cpuid))
147 /* must hold reference to node during call */
148 static const int *of_get_associativity(struct device_node *dev)
150 return of_get_property(dev, "ibm,associativity", NULL);
154 * Returns the property linux,drconf-usable-memory if
155 * it exists (the property exists only in kexec/kdump kernels,
156 * added by kexec-tools)
158 static const u32 *of_get_usable_memory(struct device_node *memory)
162 prop = of_get_property(memory, "linux,drconf-usable-memory", &len);
163 if (!prop || len < sizeof(unsigned int))
168 /* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
171 static int of_node_to_nid_single(struct device_node *device)
174 const unsigned int *tmp;
176 if (min_common_depth == -1)
179 tmp = of_get_associativity(device);
183 if (tmp[0] >= min_common_depth)
184 nid = tmp[min_common_depth];
186 /* POWER4 LPAR uses 0xffff as invalid node */
187 if (nid == 0xffff || nid >= MAX_NUMNODES)
193 /* Walk the device tree upwards, looking for an associativity id */
194 int of_node_to_nid(struct device_node *device)
196 struct device_node *tmp;
201 nid = of_node_to_nid_single(device);
206 device = of_get_parent(tmp);
213 EXPORT_SYMBOL_GPL(of_node_to_nid);
216 * In theory, the "ibm,associativity" property may contain multiple
217 * associativity lists because a resource may be multiply connected
218 * into the machine. This resource then has different associativity
219 * characteristics relative to its multiple connections. We ignore
220 * this for now. We also assume that all cpu and memory sets have
221 * their distances represented at a common level. This won't be
222 * true for hierarchical NUMA.
224 * In any case the ibm,associativity-reference-points should give
225 * the correct depth for a normal NUMA system.
227 * - Dave Hansen <haveblue@us.ibm.com>
229 static int __init find_min_common_depth(void)
232 const unsigned int *ref_points;
233 struct device_node *rtas_root;
236 rtas_root = of_find_node_by_path("/rtas");
242 * this property is 2 32-bit integers, each representing a level of
243 * depth in the associativity nodes. The first is for an SMP
244 * configuration (should be all 0's) and the second is for a normal
245 * NUMA configuration.
247 ref_points = of_get_property(rtas_root,
248 "ibm,associativity-reference-points", &len);
250 if ((len >= 1) && ref_points) {
251 depth = ref_points[1];
253 dbg("NUMA: ibm,associativity-reference-points not found.\n");
256 of_node_put(rtas_root);
261 static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
263 struct device_node *memory = NULL;
265 memory = of_find_node_by_type(memory, "memory");
267 panic("numa.c: No memory nodes found!");
269 *n_addr_cells = of_n_addr_cells(memory);
270 *n_size_cells = of_n_size_cells(memory);
274 static unsigned long __devinit read_n_cells(int n, const unsigned int **buf)
276 unsigned long result = 0;
279 result = (result << 32) | **buf;
285 struct of_drconf_cell {
293 #define DRCONF_MEM_ASSIGNED 0x00000008
294 #define DRCONF_MEM_AI_INVALID 0x00000040
295 #define DRCONF_MEM_RESERVED 0x00000080
298 * Read the next lmb list entry from the ibm,dynamic-memory property
299 * and return the information in the provided of_drconf_cell structure.
301 static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
305 drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp);
308 drmem->drc_index = cp[0];
309 drmem->reserved = cp[1];
310 drmem->aa_index = cp[2];
311 drmem->flags = cp[3];
317 * Retreive and validate the ibm,dynamic-memory property of the device tree.
319 * The layout of the ibm,dynamic-memory property is a number N of lmb
320 * list entries followed by N lmb list entries. Each lmb list entry
321 * contains information as layed out in the of_drconf_cell struct above.
323 static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
328 prop = of_get_property(memory, "ibm,dynamic-memory", &len);
329 if (!prop || len < sizeof(unsigned int))
334 /* Now that we know the number of entries, revalidate the size
335 * of the property read in to ensure we have everything
337 if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int))
345 * Retreive and validate the ibm,lmb-size property for drconf memory
346 * from the device tree.
348 static u64 of_get_lmb_size(struct device_node *memory)
353 prop = of_get_property(memory, "ibm,lmb-size", &len);
354 if (!prop || len < sizeof(unsigned int))
357 return read_n_cells(n_mem_size_cells, &prop);
360 struct assoc_arrays {
367 * Retreive and validate the list of associativity arrays for drconf
368 * memory from the ibm,associativity-lookup-arrays property of the
371 * The layout of the ibm,associativity-lookup-arrays property is a number N
372 * indicating the number of associativity arrays, followed by a number M
373 * indicating the size of each associativity array, followed by a list
374 * of N associativity arrays.
376 static int of_get_assoc_arrays(struct device_node *memory,
377 struct assoc_arrays *aa)
382 prop = of_get_property(memory, "ibm,associativity-lookup-arrays", &len);
383 if (!prop || len < 2 * sizeof(unsigned int))
386 aa->n_arrays = *prop++;
387 aa->array_sz = *prop++;
389 /* Now that we know the number of arrrays and size of each array,
390 * revalidate the size of the property read in.
392 if (len < (aa->n_arrays * aa->array_sz + 2) * sizeof(unsigned int))
400 * This is like of_node_to_nid_single() for memory represented in the
401 * ibm,dynamic-reconfiguration-memory node.
403 static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
404 struct assoc_arrays *aa)
407 int nid = default_nid;
410 if (min_common_depth > 0 && min_common_depth <= aa->array_sz &&
411 !(drmem->flags & DRCONF_MEM_AI_INVALID) &&
412 drmem->aa_index < aa->n_arrays) {
413 index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
414 nid = aa->arrays[index];
416 if (nid == 0xffff || nid >= MAX_NUMNODES)
424 * Figure out to which domain a cpu belongs and stick it there.
425 * Return the id of the domain used.
427 static int __cpuinit numa_setup_cpu(unsigned long lcpu)
430 struct device_node *cpu = find_cpu_node(lcpu);
437 nid = of_node_to_nid_single(cpu);
439 if (nid < 0 || !node_online(nid))
440 nid = any_online_node(NODE_MASK_ALL);
442 map_cpu_to_node(lcpu, nid);
449 static int __cpuinit cpu_numa_callback(struct notifier_block *nfb,
450 unsigned long action,
453 unsigned long lcpu = (unsigned long)hcpu;
454 int ret = NOTIFY_DONE;
458 case CPU_UP_PREPARE_FROZEN:
459 numa_setup_cpu(lcpu);
462 #ifdef CONFIG_HOTPLUG_CPU
464 case CPU_DEAD_FROZEN:
465 case CPU_UP_CANCELED:
466 case CPU_UP_CANCELED_FROZEN:
467 unmap_cpu_from_node(lcpu);
476 * Check and possibly modify a memory region to enforce the memory limit.
478 * Returns the size the region should have to enforce the memory limit.
479 * This will either be the original value of size, a truncated value,
480 * or zero. If the returned value of size is 0 the region should be
481 * discarded as it lies wholy above the memory limit.
483 static unsigned long __init numa_enforce_memory_limit(unsigned long start,
487 * We use lmb_end_of_DRAM() in here instead of memory_limit because
488 * we've already adjusted it for the limit and it takes care of
489 * having memory holes below the limit.
495 if (start + size <= lmb_end_of_DRAM())
498 if (start >= lmb_end_of_DRAM())
501 return lmb_end_of_DRAM() - start;
505 * Reads the counter for a given entry in
506 * linux,drconf-usable-memory property
508 static inline int __init read_usm_ranges(const u32 **usm)
511 * For each lmb in ibm,dynamic-memory a corresponding
512 * entry in linux,drconf-usable-memory property contains
513 * a counter followed by that many (base, size) duple.
514 * read the counter from linux,drconf-usable-memory
516 return read_n_cells(n_mem_size_cells, usm);
520 * Extract NUMA information from the ibm,dynamic-reconfiguration-memory
521 * node. This assumes n_mem_{addr,size}_cells have been set.
523 static void __init parse_drconf_memory(struct device_node *memory)
526 unsigned int n, rc, ranges, is_kexec_kdump = 0;
527 unsigned long lmb_size, base, size, sz;
529 struct assoc_arrays aa;
531 n = of_get_drconf_memory(memory, &dm);
535 lmb_size = of_get_lmb_size(memory);
539 rc = of_get_assoc_arrays(memory, &aa);
543 /* check if this is a kexec/kdump kernel */
544 usm = of_get_usable_memory(memory);
548 for (; n != 0; --n) {
549 struct of_drconf_cell drmem;
551 read_drconf_cell(&drmem, &dm);
553 /* skip this block if the reserved bit is set in flags (0x80)
554 or if the block is not assigned to this partition (0x8) */
555 if ((drmem.flags & DRCONF_MEM_RESERVED)
556 || !(drmem.flags & DRCONF_MEM_ASSIGNED))
559 base = drmem.base_addr;
563 if (is_kexec_kdump) {
564 ranges = read_usm_ranges(&usm);
565 if (!ranges) /* there are no (base, size) duple */
569 if (is_kexec_kdump) {
570 base = read_n_cells(n_mem_addr_cells, &usm);
571 size = read_n_cells(n_mem_size_cells, &usm);
573 nid = of_drconf_to_nid_single(&drmem, &aa);
574 fake_numa_create_new_node(
575 ((base + size) >> PAGE_SHIFT),
577 node_set_online(nid);
578 sz = numa_enforce_memory_limit(base, size);
580 add_active_range(nid, base >> PAGE_SHIFT,
582 + (sz >> PAGE_SHIFT));
587 static int __init parse_numa_properties(void)
589 struct device_node *cpu = NULL;
590 struct device_node *memory = NULL;
594 if (numa_enabled == 0) {
595 printk(KERN_WARNING "NUMA disabled by user\n");
599 min_common_depth = find_min_common_depth();
601 if (min_common_depth < 0)
602 return min_common_depth;
604 dbg("NUMA associativity depth for CPU/Memory: %d\n", min_common_depth);
607 * Even though we connect cpus to numa domains later in SMP
608 * init, we need to know the node ids now. This is because
609 * each node to be onlined must have NODE_DATA etc backing it.
611 for_each_present_cpu(i) {
614 cpu = find_cpu_node(i);
616 nid = of_node_to_nid_single(cpu);
620 * Don't fall back to default_nid yet -- we will plug
621 * cpus into nodes once the memory scan has discovered
626 node_set_online(nid);
629 get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
631 while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
636 const unsigned int *memcell_buf;
639 memcell_buf = of_get_property(memory,
640 "linux,usable-memory", &len);
641 if (!memcell_buf || len <= 0)
642 memcell_buf = of_get_property(memory, "reg", &len);
643 if (!memcell_buf || len <= 0)
647 ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
649 /* these are order-sensitive, and modify the buffer pointer */
650 start = read_n_cells(n_mem_addr_cells, &memcell_buf);
651 size = read_n_cells(n_mem_size_cells, &memcell_buf);
654 * Assumption: either all memory nodes or none will
655 * have associativity properties. If none, then
656 * everything goes to default_nid.
658 nid = of_node_to_nid_single(memory);
662 fake_numa_create_new_node(((start + size) >> PAGE_SHIFT), &nid);
663 node_set_online(nid);
665 if (!(size = numa_enforce_memory_limit(start, size))) {
672 add_active_range(nid, start >> PAGE_SHIFT,
673 (start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
680 * Now do the same thing for each LMB listed in the ibm,dynamic-memory
681 * property in the ibm,dynamic-reconfiguration-memory node.
683 memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
685 parse_drconf_memory(memory);
690 static void __init setup_nonnuma(void)
692 unsigned long top_of_ram = lmb_end_of_DRAM();
693 unsigned long total_ram = lmb_phys_mem_size();
694 unsigned long start_pfn, end_pfn;
695 unsigned int i, nid = 0;
697 printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
698 top_of_ram, total_ram);
699 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
700 (top_of_ram - total_ram) >> 20);
702 for (i = 0; i < lmb.memory.cnt; ++i) {
703 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
704 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
706 fake_numa_create_new_node(end_pfn, &nid);
707 add_active_range(nid, start_pfn, end_pfn);
708 node_set_online(nid);
712 void __init dump_numa_cpu_topology(void)
715 unsigned int cpu, count;
717 if (min_common_depth == -1 || !numa_enabled)
720 for_each_online_node(node) {
721 printk(KERN_DEBUG "Node %d CPUs:", node);
725 * If we used a CPU iterator here we would miss printing
726 * the holes in the cpumap.
728 for (cpu = 0; cpu < NR_CPUS; cpu++) {
729 if (cpu_isset(cpu, numa_cpumask_lookup_table[node])) {
735 printk("-%u", cpu - 1);
741 printk("-%u", NR_CPUS - 1);
746 static void __init dump_numa_memory_topology(void)
751 if (min_common_depth == -1 || !numa_enabled)
754 for_each_online_node(node) {
757 printk(KERN_DEBUG "Node %d Memory:", node);
761 for (i = 0; i < lmb_end_of_DRAM();
762 i += (1 << SECTION_SIZE_BITS)) {
763 if (early_pfn_to_nid(i >> PAGE_SHIFT) == node) {
781 * Allocate some memory, satisfying the lmb or bootmem allocator where
782 * required. nid is the preferred node and end is the physical address of
783 * the highest address in the node.
785 * Returns the physical address of the memory.
787 static void __init *careful_allocation(int nid, unsigned long size,
789 unsigned long end_pfn)
792 unsigned long ret = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
794 /* retry over all memory */
796 ret = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
799 panic("numa.c: cannot allocate %lu bytes on node %d",
803 * If the memory came from a previously allocated node, we must
804 * retry with the bootmem allocator.
806 new_nid = early_pfn_to_nid(ret >> PAGE_SHIFT);
808 ret = (unsigned long)__alloc_bootmem_node(NODE_DATA(new_nid),
812 panic("numa.c: cannot allocate %lu bytes on node %d",
817 dbg("alloc_bootmem %lx %lx\n", ret, size);
823 static struct notifier_block __cpuinitdata ppc64_numa_nb = {
824 .notifier_call = cpu_numa_callback,
825 .priority = 1 /* Must run before sched domains notifier. */
828 void __init do_init_bootmem(void)
834 max_low_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
835 max_pfn = max_low_pfn;
837 if (parse_numa_properties())
840 dump_numa_memory_topology();
842 register_cpu_notifier(&ppc64_numa_nb);
843 cpu_numa_callback(&ppc64_numa_nb, CPU_UP_PREPARE,
844 (void *)(unsigned long)boot_cpuid);
846 for_each_online_node(nid) {
847 unsigned long start_pfn, end_pfn;
848 unsigned long bootmem_paddr;
849 unsigned long bootmap_pages;
851 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
853 /* Allocate the node structure node local if possible */
854 NODE_DATA(nid) = careful_allocation(nid,
855 sizeof(struct pglist_data),
856 SMP_CACHE_BYTES, end_pfn);
857 NODE_DATA(nid) = __va(NODE_DATA(nid));
858 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
860 dbg("node %d\n", nid);
861 dbg("NODE_DATA() = %p\n", NODE_DATA(nid));
863 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
864 NODE_DATA(nid)->node_start_pfn = start_pfn;
865 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
867 if (NODE_DATA(nid)->node_spanned_pages == 0)
870 dbg("start_paddr = %lx\n", start_pfn << PAGE_SHIFT);
871 dbg("end_paddr = %lx\n", end_pfn << PAGE_SHIFT);
873 bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
874 bootmem_paddr = (unsigned long)careful_allocation(nid,
875 bootmap_pages << PAGE_SHIFT,
877 memset(__va(bootmem_paddr), 0, bootmap_pages << PAGE_SHIFT);
879 dbg("bootmap_paddr = %lx\n", bootmem_paddr);
881 init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
884 free_bootmem_with_active_regions(nid, end_pfn);
886 /* Mark reserved regions on this node */
887 for (i = 0; i < lmb.reserved.cnt; i++) {
888 unsigned long physbase = lmb.reserved.region[i].base;
889 unsigned long size = lmb.reserved.region[i].size;
890 unsigned long start_paddr = start_pfn << PAGE_SHIFT;
891 unsigned long end_paddr = end_pfn << PAGE_SHIFT;
893 if (early_pfn_to_nid(physbase >> PAGE_SHIFT) != nid &&
894 early_pfn_to_nid((physbase+size-1) >> PAGE_SHIFT) != nid)
897 if (physbase < end_paddr &&
898 (physbase+size) > start_paddr) {
900 if (physbase < start_paddr) {
901 size -= start_paddr - physbase;
902 physbase = start_paddr;
905 if (size > end_paddr - physbase)
906 size = end_paddr - physbase;
908 dbg("reserve_bootmem %lx %lx\n", physbase,
910 reserve_bootmem_node(NODE_DATA(nid), physbase,
911 size, BOOTMEM_DEFAULT);
915 sparse_memory_present_with_active_regions(nid);
919 void __init paging_init(void)
921 unsigned long max_zone_pfns[MAX_NR_ZONES];
922 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
923 max_zone_pfns[ZONE_DMA] = lmb_end_of_DRAM() >> PAGE_SHIFT;
924 free_area_init_nodes(max_zone_pfns);
927 static int __init early_numa(char *p)
932 if (strstr(p, "off"))
935 if (strstr(p, "debug"))
938 p = strstr(p, "fake=");
940 cmdline = p + strlen("fake=");
944 early_param("numa", early_numa);
946 #ifdef CONFIG_MEMORY_HOTPLUG
948 * Validate the node associated with the memory section we are
951 int valid_hot_add_scn(int *nid, unsigned long start, u32 lmb_size,
952 unsigned long scn_addr)
956 if (*nid < 0 || !node_online(*nid))
957 *nid = any_online_node(NODE_MASK_ALL);
959 if ((scn_addr >= start) && (scn_addr < (start + lmb_size))) {
961 while (NODE_DATA(*nid)->node_spanned_pages == 0) {
962 node_clear(*nid, nodes);
963 *nid = any_online_node(nodes);
973 * Find the node associated with a hot added memory section represented
974 * by the ibm,dynamic-reconfiguration-memory node.
976 static int hot_add_drconf_scn_to_nid(struct device_node *memory,
977 unsigned long scn_addr)
981 unsigned long lmb_size;
982 int default_nid = any_online_node(NODE_MASK_ALL);
984 struct assoc_arrays aa;
986 n = of_get_drconf_memory(memory, &dm);
990 lmb_size = of_get_lmb_size(memory);
994 rc = of_get_assoc_arrays(memory, &aa);
998 for (; n != 0; --n) {
999 struct of_drconf_cell drmem;
1001 read_drconf_cell(&drmem, &dm);
1003 /* skip this block if it is reserved or not assigned to
1005 if ((drmem.flags & DRCONF_MEM_RESERVED)
1006 || !(drmem.flags & DRCONF_MEM_ASSIGNED))
1009 nid = of_drconf_to_nid_single(&drmem, &aa);
1011 if (valid_hot_add_scn(&nid, drmem.base_addr, lmb_size,
1016 BUG(); /* section address should be found above */
1021 * Find the node associated with a hot added memory section. Section
1022 * corresponds to a SPARSEMEM section, not an LMB. It is assumed that
1023 * sections are fully contained within a single LMB.
1025 int hot_add_scn_to_nid(unsigned long scn_addr)
1027 struct device_node *memory = NULL;
1030 if (!numa_enabled || (min_common_depth < 0))
1031 return any_online_node(NODE_MASK_ALL);
1033 memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
1035 nid = hot_add_drconf_scn_to_nid(memory, scn_addr);
1036 of_node_put(memory);
1040 while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
1041 unsigned long start, size;
1043 const unsigned int *memcell_buf;
1046 memcell_buf = of_get_property(memory, "reg", &len);
1047 if (!memcell_buf || len <= 0)
1050 /* ranges in cell */
1051 ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
1053 start = read_n_cells(n_mem_addr_cells, &memcell_buf);
1054 size = read_n_cells(n_mem_size_cells, &memcell_buf);
1055 nid = of_node_to_nid_single(memory);
1057 if (valid_hot_add_scn(&nid, start, size, scn_addr)) {
1058 of_node_put(memory);
1062 if (--ranges) /* process all ranges in cell */
1065 BUG(); /* section address should be found above */
1068 #endif /* CONFIG_MEMORY_HOTPLUG */