2 * Generic VM initialization for x86-64 NUMA setups.
3 * Copyright 2002,2003 Andi Kleen, SuSE Labs.
5 #include <linux/kernel.h>
7 #include <linux/string.h>
8 #include <linux/init.h>
9 #include <linux/bootmem.h>
10 #include <linux/mmzone.h>
11 #include <linux/ctype.h>
12 #include <linux/module.h>
13 #include <linux/nodemask.h>
14 #include <linux/sched.h>
17 #include <asm/proto.h>
27 struct pglist_data
*node_data
[MAX_NUMNODES
] __read_mostly
;
28 EXPORT_SYMBOL(node_data
);
30 bootmem_data_t plat_node_bdata
[MAX_NUMNODES
];
32 struct memnode memnode
;
34 u16 x86_cpu_to_node_map_init
[NR_CPUS
] = {
35 [0 ... NR_CPUS
-1] = NUMA_NO_NODE
37 void *x86_cpu_to_node_map_early_ptr
;
38 EXPORT_SYMBOL(x86_cpu_to_node_map_init
);
39 EXPORT_SYMBOL(x86_cpu_to_node_map_early_ptr
);
40 DEFINE_PER_CPU(u16
, x86_cpu_to_node_map
) = NUMA_NO_NODE
;
41 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_node_map
);
43 u16 apicid_to_node
[MAX_LOCAL_APIC
] __cpuinitdata
= {
44 [0 ... MAX_LOCAL_APIC
-1] = NUMA_NO_NODE
47 cpumask_t node_to_cpumask_map
[MAX_NUMNODES
] __read_mostly
;
48 EXPORT_SYMBOL(node_to_cpumask_map
);
50 int numa_off __initdata
;
51 unsigned long __initdata nodemap_addr
;
52 unsigned long __initdata nodemap_size
;
55 * Given a shift value, try to populate memnodemap[]
58 * 0 if memnodmap[] too small (of shift too small)
59 * -1 if node overlap or lost ram (shift too big)
61 static int __init
populate_memnodemap(const struct bootnode
*nodes
,
62 int numnodes
, int shift
)
64 unsigned long addr
, end
;
67 memset(memnodemap
, 0xff, memnodemapsize
);
68 for (i
= 0; i
< numnodes
; i
++) {
69 addr
= nodes
[i
].start
;
73 if ((end
>> shift
) >= memnodemapsize
)
76 if (memnodemap
[addr
>> shift
] != 0xff)
78 memnodemap
[addr
>> shift
] = i
;
79 addr
+= (1UL << shift
);
86 static int __init
allocate_cachealigned_memnodemap(void)
88 unsigned long pad
, pad_addr
;
90 memnodemap
= memnode
.embedded_map
;
91 if (memnodemapsize
<= 48)
94 pad
= L1_CACHE_BYTES
- 1;
96 nodemap_size
= pad
+ memnodemapsize
;
97 nodemap_addr
= find_e820_area(pad_addr
, end_pfn
<<PAGE_SHIFT
,
99 if (nodemap_addr
== -1UL) {
101 "NUMA: Unable to allocate Memory to Node hash map\n");
102 nodemap_addr
= nodemap_size
= 0;
105 pad_addr
= (nodemap_addr
+ pad
) & ~pad
;
106 memnodemap
= phys_to_virt(pad_addr
);
108 printk(KERN_DEBUG
"NUMA: Allocated memnodemap from %lx - %lx\n",
109 nodemap_addr
, nodemap_addr
+ nodemap_size
);
114 * The LSB of all start and end addresses in the node map is the value of the
115 * maximum possible shift.
117 static int __init
extract_lsb_from_nodes(const struct bootnode
*nodes
,
120 int i
, nodes_used
= 0;
121 unsigned long start
, end
;
122 unsigned long bitfield
= 0, memtop
= 0;
124 for (i
= 0; i
< numnodes
; i
++) {
125 start
= nodes
[i
].start
;
137 i
= find_first_bit(&bitfield
, sizeof(unsigned long)*8);
138 memnodemapsize
= (memtop
>> i
)+1;
142 int __init
compute_hash_shift(struct bootnode
*nodes
, int numnodes
)
146 shift
= extract_lsb_from_nodes(nodes
, numnodes
);
147 if (allocate_cachealigned_memnodemap())
149 printk(KERN_DEBUG
"NUMA: Using %d for the hash shift.\n",
152 if (populate_memnodemap(nodes
, numnodes
, shift
) != 1) {
153 printk(KERN_INFO
"Your memory is not aligned you need to "
154 "rebuild your kernel with a bigger NODEMAPSIZE "
155 "shift=%d\n", shift
);
161 int early_pfn_to_nid(unsigned long pfn
)
163 return phys_to_nid(pfn
<< PAGE_SHIFT
);
166 static void * __init
early_node_mem(int nodeid
, unsigned long start
,
167 unsigned long end
, unsigned long size
)
169 unsigned long mem
= find_e820_area(start
, end
, size
);
174 ptr
= __alloc_bootmem_nopanic(size
,
175 SMP_CACHE_BYTES
, __pa(MAX_DMA_ADDRESS
));
177 printk(KERN_ERR
"Cannot find %lu bytes in node %d\n",
184 /* Initialize bootmem allocator for a node */
185 void __init
setup_node_bootmem(int nodeid
, unsigned long start
,
188 unsigned long start_pfn
, end_pfn
, bootmap_pages
, bootmap_size
;
189 unsigned long bootmap_start
, nodedata_phys
;
191 const int pgdat_size
= round_up(sizeof(pg_data_t
), PAGE_SIZE
);
193 start
= round_up(start
, ZONE_ALIGN
);
195 printk(KERN_INFO
"Bootmem setup node %d %016lx-%016lx\n", nodeid
,
198 start_pfn
= start
>> PAGE_SHIFT
;
199 end_pfn
= end
>> PAGE_SHIFT
;
201 node_data
[nodeid
] = early_node_mem(nodeid
, start
, end
, pgdat_size
);
202 if (node_data
[nodeid
] == NULL
)
204 nodedata_phys
= __pa(node_data
[nodeid
]);
206 memset(NODE_DATA(nodeid
), 0, sizeof(pg_data_t
));
207 NODE_DATA(nodeid
)->bdata
= &plat_node_bdata
[nodeid
];
208 NODE_DATA(nodeid
)->node_start_pfn
= start_pfn
;
209 NODE_DATA(nodeid
)->node_spanned_pages
= end_pfn
- start_pfn
;
211 /* Find a place for the bootmem map */
212 bootmap_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
213 bootmap_start
= round_up(nodedata_phys
+ pgdat_size
, PAGE_SIZE
);
214 bootmap
= early_node_mem(nodeid
, bootmap_start
, end
,
215 bootmap_pages
<<PAGE_SHIFT
);
216 if (bootmap
== NULL
) {
217 if (nodedata_phys
< start
|| nodedata_phys
>= end
)
218 free_bootmem((unsigned long)node_data
[nodeid
],
220 node_data
[nodeid
] = NULL
;
223 bootmap_start
= __pa(bootmap
);
224 Dprintk("bootmap start %lu pages %lu\n", bootmap_start
, bootmap_pages
);
226 bootmap_size
= init_bootmem_node(NODE_DATA(nodeid
),
227 bootmap_start
>> PAGE_SHIFT
,
230 free_bootmem_with_active_regions(nodeid
, end
);
232 reserve_bootmem_node(NODE_DATA(nodeid
), nodedata_phys
, pgdat_size
);
233 reserve_bootmem_node(NODE_DATA(nodeid
), bootmap_start
,
234 bootmap_pages
<<PAGE_SHIFT
);
235 #ifdef CONFIG_ACPI_NUMA
236 srat_reserve_add_area(nodeid
);
238 node_set_online(nodeid
);
241 #ifdef CONFIG_FLAT_NODE_MEM_MAP
242 /* Initialize final allocator for a zone */
243 static void __init
flat_setup_node_zones(int nodeid
)
245 unsigned long start_pfn
, end_pfn
, memmapsize
, limit
;
247 start_pfn
= node_start_pfn(nodeid
);
248 end_pfn
= node_end_pfn(nodeid
);
250 Dprintk(KERN_INFO
"Setting up memmap for node %d %lx-%lx\n",
251 nodeid
, start_pfn
, end_pfn
);
254 * Try to allocate mem_map at end to not fill up precious <4GB
257 memmapsize
= sizeof(struct page
) * (end_pfn
-start_pfn
);
258 limit
= end_pfn
<< PAGE_SHIFT
;
260 NODE_DATA(nodeid
)->node_mem_map
=
261 __alloc_bootmem_core(NODE_DATA(nodeid
)->bdata
,
262 memmapsize
, SMP_CACHE_BYTES
,
263 round_down(limit
- memmapsize
, PAGE_SIZE
),
267 #define flat_setup_node_zones(i) do {} while (0)
271 * There are unfortunately some poorly designed mainboards around that
272 * only connect memory to a single CPU. This breaks the 1:1 cpu->node
273 * mapping. To avoid this fill in the mapping for all possible CPUs,
274 * as the number of CPUs is not known yet. We round robin the existing
277 void __init
numa_init_array(void)
281 rr
= first_node(node_online_map
);
282 for (i
= 0; i
< NR_CPUS
; i
++) {
283 if (cpu_to_node(i
) != NUMA_NO_NODE
)
285 numa_set_node(i
, rr
);
286 rr
= next_node(rr
, node_online_map
);
287 if (rr
== MAX_NUMNODES
)
288 rr
= first_node(node_online_map
);
292 #ifdef CONFIG_NUMA_EMU
294 char *cmdline __initdata
;
297 * Setups up nid to range from addr to addr + size. If the end
298 * boundary is greater than max_addr, then max_addr is used instead.
299 * The return value is 0 if there is additional memory left for
300 * allocation past addr and -1 otherwise. addr is adjusted to be at
301 * the end of the node.
303 static int __init
setup_node_range(int nid
, struct bootnode
*nodes
, u64
*addr
,
304 u64 size
, u64 max_addr
)
308 nodes
[nid
].start
= *addr
;
310 if (*addr
>= max_addr
) {
314 nodes
[nid
].end
= *addr
;
315 node_set(nid
, node_possible_map
);
316 printk(KERN_INFO
"Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid
,
317 nodes
[nid
].start
, nodes
[nid
].end
,
318 (nodes
[nid
].end
- nodes
[nid
].start
) >> 20);
323 * Splits num_nodes nodes up equally starting at node_start. The return value
324 * is the number of nodes split up and addr is adjusted to be at the end of the
325 * last node allocated.
327 static int __init
split_nodes_equally(struct bootnode
*nodes
, u64
*addr
,
328 u64 max_addr
, int node_start
,
337 if (num_nodes
> MAX_NUMNODES
)
338 num_nodes
= MAX_NUMNODES
;
339 size
= (max_addr
- *addr
- e820_hole_size(*addr
, max_addr
)) /
342 * Calculate the number of big nodes that can be allocated as a result
343 * of consolidating the leftovers.
345 big
= ((size
& ~FAKE_NODE_MIN_HASH_MASK
) * num_nodes
) /
348 /* Round down to nearest FAKE_NODE_MIN_SIZE. */
349 size
&= FAKE_NODE_MIN_HASH_MASK
;
351 printk(KERN_ERR
"Not enough memory for each node. "
352 "NUMA emulation disabled.\n");
356 for (i
= node_start
; i
< num_nodes
+ node_start
; i
++) {
357 u64 end
= *addr
+ size
;
360 end
+= FAKE_NODE_MIN_SIZE
;
362 * The final node can have the remaining system RAM. Other
363 * nodes receive roughly the same amount of available pages.
365 if (i
== num_nodes
+ node_start
- 1)
368 while (end
- *addr
- e820_hole_size(*addr
, end
) <
370 end
+= FAKE_NODE_MIN_SIZE
;
371 if (end
> max_addr
) {
376 if (setup_node_range(i
, nodes
, addr
, end
- *addr
, max_addr
) < 0)
379 return i
- node_start
+ 1;
383 * Splits the remaining system RAM into chunks of size. The remaining memory is
384 * always assigned to a final node and can be asymmetric. Returns the number of
387 static int __init
split_nodes_by_size(struct bootnode
*nodes
, u64
*addr
,
388 u64 max_addr
, int node_start
, u64 size
)
391 size
= (size
<< 20) & FAKE_NODE_MIN_HASH_MASK
;
392 while (!setup_node_range(i
++, nodes
, addr
, size
, max_addr
))
394 return i
- node_start
;
398 * Sets up the system RAM area from start_pfn to end_pfn according to the
399 * numa=fake command-line option.
401 static int __init
numa_emulation(unsigned long start_pfn
, unsigned long end_pfn
)
403 struct bootnode nodes
[MAX_NUMNODES
];
404 u64 size
, addr
= start_pfn
<< PAGE_SHIFT
;
405 u64 max_addr
= end_pfn
<< PAGE_SHIFT
;
406 int num_nodes
= 0, num
= 0, coeff_flag
, coeff
= -1, i
;
408 memset(&nodes
, 0, sizeof(nodes
));
410 * If the numa=fake command-line is just a single number N, split the
411 * system RAM into N fake nodes.
413 if (!strchr(cmdline
, '*') && !strchr(cmdline
, ',')) {
414 long n
= simple_strtol(cmdline
, NULL
, 0);
416 num_nodes
= split_nodes_equally(nodes
, &addr
, max_addr
, 0, n
);
422 /* Parse the command line. */
423 for (coeff_flag
= 0; ; cmdline
++) {
424 if (*cmdline
&& isdigit(*cmdline
)) {
425 num
= num
* 10 + *cmdline
- '0';
428 if (*cmdline
== '*') {
433 if (!*cmdline
|| *cmdline
== ',') {
437 * Round down to the nearest FAKE_NODE_MIN_SIZE.
438 * Command-line coefficients are in megabytes.
440 size
= ((u64
)num
<< 20) & FAKE_NODE_MIN_HASH_MASK
;
442 for (i
= 0; i
< coeff
; i
++, num_nodes
++)
443 if (setup_node_range(num_nodes
, nodes
,
444 &addr
, size
, max_addr
) < 0)
456 /* Fill remainder of system RAM, if appropriate. */
457 if (addr
< max_addr
) {
458 if (coeff_flag
&& coeff
< 0) {
459 /* Split remaining nodes into num-sized chunks */
460 num_nodes
+= split_nodes_by_size(nodes
, &addr
, max_addr
,
464 switch (*(cmdline
- 1)) {
466 /* Split remaining nodes into coeff chunks */
469 num_nodes
+= split_nodes_equally(nodes
, &addr
, max_addr
,
473 /* Do not allocate remaining system RAM */
476 /* Give one final node */
477 setup_node_range(num_nodes
, nodes
, &addr
,
478 max_addr
- addr
, max_addr
);
483 memnode_shift
= compute_hash_shift(nodes
, num_nodes
);
484 if (memnode_shift
< 0) {
486 printk(KERN_ERR
"No NUMA hash function found. NUMA emulation "
492 * We need to vacate all active ranges that may have been registered by
493 * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
494 * true. NUMA emulation has succeeded so we will not scan ACPI nodes.
496 remove_all_active_ranges();
497 #ifdef CONFIG_ACPI_NUMA
500 for_each_node_mask(i
, node_possible_map
) {
501 e820_register_active_regions(i
, nodes
[i
].start
>> PAGE_SHIFT
,
502 nodes
[i
].end
>> PAGE_SHIFT
);
503 setup_node_bootmem(i
, nodes
[i
].start
, nodes
[i
].end
);
505 acpi_fake_nodes(nodes
, num_nodes
);
509 #endif /* CONFIG_NUMA_EMU */
511 void __init
numa_initmem_init(unsigned long start_pfn
, unsigned long end_pfn
)
515 nodes_clear(node_possible_map
);
517 #ifdef CONFIG_NUMA_EMU
518 if (cmdline
&& !numa_emulation(start_pfn
, end_pfn
))
520 nodes_clear(node_possible_map
);
523 #ifdef CONFIG_ACPI_NUMA
524 if (!numa_off
&& !acpi_scan_nodes(start_pfn
<< PAGE_SHIFT
,
525 end_pfn
<< PAGE_SHIFT
))
527 nodes_clear(node_possible_map
);
530 #ifdef CONFIG_K8_NUMA
531 if (!numa_off
&& !k8_scan_nodes(start_pfn
<<PAGE_SHIFT
,
532 end_pfn
<<PAGE_SHIFT
))
534 nodes_clear(node_possible_map
);
536 printk(KERN_INFO
"%s\n",
537 numa_off
? "NUMA turned off" : "No NUMA configuration found");
539 printk(KERN_INFO
"Faking a node at %016lx-%016lx\n",
540 start_pfn
<< PAGE_SHIFT
,
541 end_pfn
<< PAGE_SHIFT
);
542 /* setup dummy node covering all memory */
544 memnodemap
= memnode
.embedded_map
;
546 nodes_clear(node_online_map
);
548 node_set(0, node_possible_map
);
549 for (i
= 0; i
< NR_CPUS
; i
++)
551 /* cpumask_of_cpu() may not be available during early startup */
552 memset(&node_to_cpumask_map
[0], 0, sizeof(node_to_cpumask_map
[0]));
553 cpu_set(0, node_to_cpumask_map
[0]);
554 e820_register_active_regions(0, start_pfn
, end_pfn
);
555 setup_node_bootmem(0, start_pfn
<< PAGE_SHIFT
, end_pfn
<< PAGE_SHIFT
);
558 __cpuinit
void numa_add_cpu(int cpu
)
560 set_bit(cpu
, (unsigned long *)&node_to_cpumask_map
[cpu_to_node(cpu
)]);
563 void __cpuinit
numa_set_node(int cpu
, int node
)
565 u16
*cpu_to_node_map
= x86_cpu_to_node_map_early_ptr
;
567 cpu_pda(cpu
)->nodenumber
= node
;
570 cpu_to_node_map
[cpu
] = node
;
571 else if(per_cpu_offset(cpu
))
572 per_cpu(x86_cpu_to_node_map
, cpu
) = node
;
574 Dprintk(KERN_INFO
"Setting node for non-present cpu %d\n", cpu
);
577 unsigned long __init
numa_free_all_bootmem(void)
579 unsigned long pages
= 0;
582 for_each_online_node(i
)
583 pages
+= free_all_bootmem_node(NODE_DATA(i
));
588 void __init
paging_init(void)
590 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
593 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
594 max_zone_pfns
[ZONE_DMA
] = MAX_DMA_PFN
;
595 max_zone_pfns
[ZONE_DMA32
] = MAX_DMA32_PFN
;
596 max_zone_pfns
[ZONE_NORMAL
] = end_pfn
;
598 sparse_memory_present_with_active_regions(MAX_NUMNODES
);
601 for_each_online_node(i
)
602 flat_setup_node_zones(i
);
604 free_area_init_nodes(max_zone_pfns
);
607 static __init
int numa_setup(char *opt
)
611 if (!strncmp(opt
, "off", 3))
613 #ifdef CONFIG_NUMA_EMU
614 if (!strncmp(opt
, "fake=", 5))
617 #ifdef CONFIG_ACPI_NUMA
618 if (!strncmp(opt
, "noacpi", 6))
620 if (!strncmp(opt
, "hotadd=", 7))
621 hotadd_percent
= simple_strtoul(opt
+7, NULL
, 10);
625 early_param("numa", numa_setup
);
628 * Setup early cpu_to_node.
630 * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
631 * and apicid_to_node[] tables have valid entries for a CPU.
632 * This means we skip cpu_to_node[] initialisation for NUMA
633 * emulation and faking node case (when running a kernel compiled
634 * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
635 * is already initialized in a round robin manner at numa_init_array,
636 * prior to this call, and this initialization is good enough
637 * for the fake NUMA cases.
639 void __init
init_cpu_to_node(void)
643 for (i
= 0; i
< NR_CPUS
; i
++) {
644 u16 apicid
= x86_cpu_to_apicid_init
[i
];
646 if (apicid
== BAD_APICID
)
648 if (apicid_to_node
[apicid
] == NUMA_NO_NODE
)
650 numa_set_node(i
, apicid_to_node
[apicid
]);