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>
16 #include <asm/proto.h>
26 struct pglist_data
*node_data
[MAX_NUMNODES
] __read_mostly
;
27 EXPORT_SYMBOL(node_data
);
29 bootmem_data_t plat_node_bdata
[MAX_NUMNODES
];
31 struct memnode memnode
;
33 int cpu_to_node_map
[NR_CPUS
] __read_mostly
= {
34 [0 ... NR_CPUS
-1] = NUMA_NO_NODE
36 EXPORT_SYMBOL(cpu_to_node_map
);
38 unsigned char apicid_to_node
[MAX_LOCAL_APIC
] __cpuinitdata
= {
39 [0 ... MAX_LOCAL_APIC
-1] = NUMA_NO_NODE
42 cpumask_t node_to_cpumask_map
[MAX_NUMNODES
] __read_mostly
;
43 EXPORT_SYMBOL(node_to_cpumask_map
);
45 int numa_off __initdata
;
46 unsigned long __initdata nodemap_addr
;
47 unsigned long __initdata nodemap_size
;
50 * Given a shift value, try to populate memnodemap[]
53 * 0 if memnodmap[] too small (of shift too small)
54 * -1 if node overlap or lost ram (shift too big)
56 static int __init
populate_memnodemap(const struct bootnode
*nodes
,
57 int numnodes
, int shift
)
59 unsigned long addr
, end
;
62 memset(memnodemap
, 0xff, memnodemapsize
);
63 for (i
= 0; i
< numnodes
; i
++) {
64 addr
= nodes
[i
].start
;
68 if ((end
>> shift
) >= memnodemapsize
)
71 if (memnodemap
[addr
>> shift
] != 0xff)
73 memnodemap
[addr
>> shift
] = i
;
74 addr
+= (1UL << shift
);
81 static int __init
allocate_cachealigned_memnodemap(void)
83 unsigned long pad
, pad_addr
;
85 memnodemap
= memnode
.embedded_map
;
86 if (memnodemapsize
<= 48)
89 pad
= L1_CACHE_BYTES
- 1;
91 nodemap_size
= pad
+ memnodemapsize
;
92 nodemap_addr
= find_e820_area(pad_addr
, end_pfn
<<PAGE_SHIFT
,
94 if (nodemap_addr
== -1UL) {
96 "NUMA: Unable to allocate Memory to Node hash map\n");
97 nodemap_addr
= nodemap_size
= 0;
100 pad_addr
= (nodemap_addr
+ pad
) & ~pad
;
101 memnodemap
= phys_to_virt(pad_addr
);
103 printk(KERN_DEBUG
"NUMA: Allocated memnodemap from %lx - %lx\n",
104 nodemap_addr
, nodemap_addr
+ nodemap_size
);
109 * The LSB of all start and end addresses in the node map is the value of the
110 * maximum possible shift.
112 static int __init
extract_lsb_from_nodes(const struct bootnode
*nodes
,
115 int i
, nodes_used
= 0;
116 unsigned long start
, end
;
117 unsigned long bitfield
= 0, memtop
= 0;
119 for (i
= 0; i
< numnodes
; i
++) {
120 start
= nodes
[i
].start
;
132 i
= find_first_bit(&bitfield
, sizeof(unsigned long)*8);
133 memnodemapsize
= (memtop
>> i
)+1;
137 int __init
compute_hash_shift(struct bootnode
*nodes
, int numnodes
)
141 shift
= extract_lsb_from_nodes(nodes
, numnodes
);
142 if (allocate_cachealigned_memnodemap())
144 printk(KERN_DEBUG
"NUMA: Using %d for the hash shift.\n",
147 if (populate_memnodemap(nodes
, numnodes
, shift
) != 1) {
148 printk(KERN_INFO
"Your memory is not aligned you need to "
149 "rebuild your kernel with a bigger NODEMAPSIZE "
150 "shift=%d\n", shift
);
156 int early_pfn_to_nid(unsigned long pfn
)
158 return phys_to_nid(pfn
<< PAGE_SHIFT
);
161 static void * __init
early_node_mem(int nodeid
, unsigned long start
,
162 unsigned long end
, unsigned long size
)
164 unsigned long mem
= find_e820_area(start
, end
, size
);
169 ptr
= __alloc_bootmem_nopanic(size
,
170 SMP_CACHE_BYTES
, __pa(MAX_DMA_ADDRESS
));
172 printk(KERN_ERR
"Cannot find %lu bytes in node %d\n",
179 /* Initialize bootmem allocator for a node */
180 void __init
setup_node_bootmem(int nodeid
, unsigned long start
,
183 unsigned long start_pfn
, end_pfn
, bootmap_pages
, bootmap_size
;
184 unsigned long bootmap_start
, nodedata_phys
;
186 const int pgdat_size
= round_up(sizeof(pg_data_t
), PAGE_SIZE
);
188 start
= round_up(start
, ZONE_ALIGN
);
190 printk(KERN_INFO
"Bootmem setup node %d %016lx-%016lx\n", nodeid
,
193 start_pfn
= start
>> PAGE_SHIFT
;
194 end_pfn
= end
>> PAGE_SHIFT
;
196 node_data
[nodeid
] = early_node_mem(nodeid
, start
, end
, pgdat_size
);
197 if (node_data
[nodeid
] == NULL
)
199 nodedata_phys
= __pa(node_data
[nodeid
]);
201 memset(NODE_DATA(nodeid
), 0, sizeof(pg_data_t
));
202 NODE_DATA(nodeid
)->bdata
= &plat_node_bdata
[nodeid
];
203 NODE_DATA(nodeid
)->node_start_pfn
= start_pfn
;
204 NODE_DATA(nodeid
)->node_spanned_pages
= end_pfn
- start_pfn
;
206 /* Find a place for the bootmem map */
207 bootmap_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
208 bootmap_start
= round_up(nodedata_phys
+ pgdat_size
, PAGE_SIZE
);
209 bootmap
= early_node_mem(nodeid
, bootmap_start
, end
,
210 bootmap_pages
<<PAGE_SHIFT
);
211 if (bootmap
== NULL
) {
212 if (nodedata_phys
< start
|| nodedata_phys
>= end
)
213 free_bootmem((unsigned long)node_data
[nodeid
],
215 node_data
[nodeid
] = NULL
;
218 bootmap_start
= __pa(bootmap
);
219 Dprintk("bootmap start %lu pages %lu\n", bootmap_start
, bootmap_pages
);
221 bootmap_size
= init_bootmem_node(NODE_DATA(nodeid
),
222 bootmap_start
>> PAGE_SHIFT
,
225 free_bootmem_with_active_regions(nodeid
, end
);
227 reserve_bootmem_node(NODE_DATA(nodeid
), nodedata_phys
, pgdat_size
);
228 reserve_bootmem_node(NODE_DATA(nodeid
), bootmap_start
,
229 bootmap_pages
<<PAGE_SHIFT
);
230 #ifdef CONFIG_ACPI_NUMA
231 srat_reserve_add_area(nodeid
);
233 node_set_online(nodeid
);
236 /* Initialize final allocator for a zone */
237 void __init
setup_node_zones(int nodeid
)
239 unsigned long start_pfn
, end_pfn
, memmapsize
, limit
;
241 start_pfn
= node_start_pfn(nodeid
);
242 end_pfn
= node_end_pfn(nodeid
);
244 Dprintk(KERN_INFO
"Setting up memmap for node %d %lx-%lx\n",
245 nodeid
, start_pfn
, end_pfn
);
248 * Try to allocate mem_map at end to not fill up precious <4GB
251 memmapsize
= sizeof(struct page
) * (end_pfn
-start_pfn
);
252 limit
= end_pfn
<< PAGE_SHIFT
;
253 #ifdef CONFIG_FLAT_NODE_MEM_MAP
254 NODE_DATA(nodeid
)->node_mem_map
=
255 __alloc_bootmem_core(NODE_DATA(nodeid
)->bdata
,
256 memmapsize
, SMP_CACHE_BYTES
,
257 round_down(limit
- memmapsize
, PAGE_SIZE
),
263 * There are unfortunately some poorly designed mainboards around that
264 * only connect memory to a single CPU. This breaks the 1:1 cpu->node
265 * mapping. To avoid this fill in the mapping for all possible CPUs,
266 * as the number of CPUs is not known yet. We round robin the existing
269 void __init
numa_init_array(void)
273 rr
= first_node(node_online_map
);
274 for (i
= 0; i
< NR_CPUS
; i
++) {
275 if (cpu_to_node(i
) != NUMA_NO_NODE
)
277 numa_set_node(i
, rr
);
278 rr
= next_node(rr
, node_online_map
);
279 if (rr
== MAX_NUMNODES
)
280 rr
= first_node(node_online_map
);
284 #ifdef CONFIG_NUMA_EMU
286 char *cmdline __initdata
;
289 * Setups up nid to range from addr to addr + size. If the end
290 * boundary is greater than max_addr, then max_addr is used instead.
291 * The return value is 0 if there is additional memory left for
292 * allocation past addr and -1 otherwise. addr is adjusted to be at
293 * the end of the node.
295 static int __init
setup_node_range(int nid
, struct bootnode
*nodes
, u64
*addr
,
296 u64 size
, u64 max_addr
)
300 nodes
[nid
].start
= *addr
;
302 if (*addr
>= max_addr
) {
306 nodes
[nid
].end
= *addr
;
307 node_set(nid
, node_possible_map
);
308 printk(KERN_INFO
"Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid
,
309 nodes
[nid
].start
, nodes
[nid
].end
,
310 (nodes
[nid
].end
- nodes
[nid
].start
) >> 20);
315 * Splits num_nodes nodes up equally starting at node_start. The return value
316 * is the number of nodes split up and addr is adjusted to be at the end of the
317 * last node allocated.
319 static int __init
split_nodes_equally(struct bootnode
*nodes
, u64
*addr
,
320 u64 max_addr
, int node_start
,
329 if (num_nodes
> MAX_NUMNODES
)
330 num_nodes
= MAX_NUMNODES
;
331 size
= (max_addr
- *addr
- e820_hole_size(*addr
, max_addr
)) /
334 * Calculate the number of big nodes that can be allocated as a result
335 * of consolidating the leftovers.
337 big
= ((size
& ~FAKE_NODE_MIN_HASH_MASK
) * num_nodes
) /
340 /* Round down to nearest FAKE_NODE_MIN_SIZE. */
341 size
&= FAKE_NODE_MIN_HASH_MASK
;
343 printk(KERN_ERR
"Not enough memory for each node. "
344 "NUMA emulation disabled.\n");
348 for (i
= node_start
; i
< num_nodes
+ node_start
; i
++) {
349 u64 end
= *addr
+ size
;
352 end
+= FAKE_NODE_MIN_SIZE
;
354 * The final node can have the remaining system RAM. Other
355 * nodes receive roughly the same amount of available pages.
357 if (i
== num_nodes
+ node_start
- 1)
360 while (end
- *addr
- e820_hole_size(*addr
, end
) <
362 end
+= FAKE_NODE_MIN_SIZE
;
363 if (end
> max_addr
) {
368 if (setup_node_range(i
, nodes
, addr
, end
- *addr
, max_addr
) < 0)
371 return i
- node_start
+ 1;
375 * Splits the remaining system RAM into chunks of size. The remaining memory is
376 * always assigned to a final node and can be asymmetric. Returns the number of
379 static int __init
split_nodes_by_size(struct bootnode
*nodes
, u64
*addr
,
380 u64 max_addr
, int node_start
, u64 size
)
383 size
= (size
<< 20) & FAKE_NODE_MIN_HASH_MASK
;
384 while (!setup_node_range(i
++, nodes
, addr
, size
, max_addr
))
386 return i
- node_start
;
390 * Sets up the system RAM area from start_pfn to end_pfn according to the
391 * numa=fake command-line option.
393 static int __init
numa_emulation(unsigned long start_pfn
, unsigned long end_pfn
)
395 struct bootnode nodes
[MAX_NUMNODES
];
396 u64 size
, addr
= start_pfn
<< PAGE_SHIFT
;
397 u64 max_addr
= end_pfn
<< PAGE_SHIFT
;
398 int num_nodes
= 0, num
= 0, coeff_flag
, coeff
= -1, i
;
400 memset(&nodes
, 0, sizeof(nodes
));
402 * If the numa=fake command-line is just a single number N, split the
403 * system RAM into N fake nodes.
405 if (!strchr(cmdline
, '*') && !strchr(cmdline
, ',')) {
406 long n
= simple_strtol(cmdline
, NULL
, 0);
408 num_nodes
= split_nodes_equally(nodes
, &addr
, max_addr
, 0, n
);
414 /* Parse the command line. */
415 for (coeff_flag
= 0; ; cmdline
++) {
416 if (*cmdline
&& isdigit(*cmdline
)) {
417 num
= num
* 10 + *cmdline
- '0';
420 if (*cmdline
== '*') {
425 if (!*cmdline
|| *cmdline
== ',') {
429 * Round down to the nearest FAKE_NODE_MIN_SIZE.
430 * Command-line coefficients are in megabytes.
432 size
= ((u64
)num
<< 20) & FAKE_NODE_MIN_HASH_MASK
;
434 for (i
= 0; i
< coeff
; i
++, num_nodes
++)
435 if (setup_node_range(num_nodes
, nodes
,
436 &addr
, size
, max_addr
) < 0)
448 /* Fill remainder of system RAM, if appropriate. */
449 if (addr
< max_addr
) {
450 if (coeff_flag
&& coeff
< 0) {
451 /* Split remaining nodes into num-sized chunks */
452 num_nodes
+= split_nodes_by_size(nodes
, &addr
, max_addr
,
456 switch (*(cmdline
- 1)) {
458 /* Split remaining nodes into coeff chunks */
461 num_nodes
+= split_nodes_equally(nodes
, &addr
, max_addr
,
465 /* Do not allocate remaining system RAM */
468 /* Give one final node */
469 setup_node_range(num_nodes
, nodes
, &addr
,
470 max_addr
- addr
, max_addr
);
475 memnode_shift
= compute_hash_shift(nodes
, num_nodes
);
476 if (memnode_shift
< 0) {
478 printk(KERN_ERR
"No NUMA hash function found. NUMA emulation "
484 * We need to vacate all active ranges that may have been registered by
485 * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
486 * true. NUMA emulation has succeeded so we will not scan ACPI nodes.
488 remove_all_active_ranges();
489 #ifdef CONFIG_ACPI_NUMA
492 for_each_node_mask(i
, node_possible_map
) {
493 e820_register_active_regions(i
, nodes
[i
].start
>> PAGE_SHIFT
,
494 nodes
[i
].end
>> PAGE_SHIFT
);
495 setup_node_bootmem(i
, nodes
[i
].start
, nodes
[i
].end
);
497 acpi_fake_nodes(nodes
, num_nodes
);
501 #endif /* CONFIG_NUMA_EMU */
503 void __init
numa_initmem_init(unsigned long start_pfn
, unsigned long end_pfn
)
507 nodes_clear(node_possible_map
);
509 #ifdef CONFIG_NUMA_EMU
510 if (cmdline
&& !numa_emulation(start_pfn
, end_pfn
))
512 nodes_clear(node_possible_map
);
515 #ifdef CONFIG_ACPI_NUMA
516 if (!numa_off
&& !acpi_scan_nodes(start_pfn
<< PAGE_SHIFT
,
517 end_pfn
<< PAGE_SHIFT
))
519 nodes_clear(node_possible_map
);
522 #ifdef CONFIG_K8_NUMA
523 if (!numa_off
&& !k8_scan_nodes(start_pfn
<<PAGE_SHIFT
,
524 end_pfn
<<PAGE_SHIFT
))
526 nodes_clear(node_possible_map
);
528 printk(KERN_INFO
"%s\n",
529 numa_off
? "NUMA turned off" : "No NUMA configuration found");
531 printk(KERN_INFO
"Faking a node at %016lx-%016lx\n",
532 start_pfn
<< PAGE_SHIFT
,
533 end_pfn
<< PAGE_SHIFT
);
534 /* setup dummy node covering all memory */
536 memnodemap
= memnode
.embedded_map
;
538 nodes_clear(node_online_map
);
540 node_set(0, node_possible_map
);
541 for (i
= 0; i
< NR_CPUS
; i
++)
543 node_to_cpumask_map
[0] = cpumask_of_cpu(0);
544 e820_register_active_regions(0, start_pfn
, end_pfn
);
545 setup_node_bootmem(0, start_pfn
<< PAGE_SHIFT
, end_pfn
<< PAGE_SHIFT
);
548 __cpuinit
void numa_add_cpu(int cpu
)
550 set_bit(cpu
, &node_to_cpumask_map
[cpu_to_node(cpu
)]);
553 void __cpuinit
numa_set_node(int cpu
, int node
)
555 cpu_pda(cpu
)->nodenumber
= node
;
556 cpu_to_node_map
[cpu
] = node
;
559 unsigned long __init
numa_free_all_bootmem(void)
561 unsigned long pages
= 0;
564 for_each_online_node(i
)
565 pages
+= free_all_bootmem_node(NODE_DATA(i
));
570 void __init
paging_init(void)
572 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
575 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
576 max_zone_pfns
[ZONE_DMA
] = MAX_DMA_PFN
;
577 max_zone_pfns
[ZONE_DMA32
] = MAX_DMA32_PFN
;
578 max_zone_pfns
[ZONE_NORMAL
] = end_pfn
;
580 sparse_memory_present_with_active_regions(MAX_NUMNODES
);
583 for_each_online_node(i
)
586 free_area_init_nodes(max_zone_pfns
);
589 static __init
int numa_setup(char *opt
)
593 if (!strncmp(opt
, "off", 3))
595 #ifdef CONFIG_NUMA_EMU
596 if (!strncmp(opt
, "fake=", 5))
599 #ifdef CONFIG_ACPI_NUMA
600 if (!strncmp(opt
, "noacpi", 6))
602 if (!strncmp(opt
, "hotadd=", 7))
603 hotadd_percent
= simple_strtoul(opt
+7, NULL
, 10);
607 early_param("numa", numa_setup
);
610 * Setup early cpu_to_node.
612 * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
613 * and apicid_to_node[] tables have valid entries for a CPU.
614 * This means we skip cpu_to_node[] initialisation for NUMA
615 * emulation and faking node case (when running a kernel compiled
616 * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
617 * is already initialized in a round robin manner at numa_init_array,
618 * prior to this call, and this initialization is good enough
619 * for the fake NUMA cases.
621 void __init
init_cpu_to_node(void)
625 for (i
= 0; i
< NR_CPUS
; i
++) {
626 u8 apicid
= x86_cpu_to_apicid_init
[i
];
628 if (apicid
== BAD_APICID
)
630 if (apicid_to_node
[apicid
] == NUMA_NO_NODE
)
632 numa_set_node(i
, apicid_to_node
[apicid
]);