[deliverable/linux.git] / arch / x86 / kernel / setup_percpu.c

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/percpu.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <asm/smp.h>
#include <asm/percpu.h>
#include <asm/sections.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/topology.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/highmem.h>

#ifdef CONFIG_X86_LOCAL_APIC
unsigned int num_processors;
unsigned disabled_cpus __cpuinitdata;
/* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U;
unsigned int max_physical_apicid;
EXPORT_SYMBOL(boot_cpu_physical_apicid);

/* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map;
#endif

/* map cpu index to physical APIC ID */
DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);

#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
#define	X86_64_NUMA	1

/* map cpu index to node index */
DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);

/* which logical CPUs are on which nodes */
cpumask_t *node_to_cpumask_map;
EXPORT_SYMBOL(node_to_cpumask_map);

/* setup node_to_cpumask_map */
static void __init setup_node_to_cpumask_map(void);

#else
static inline void setup_node_to_cpumask_map(void) { }
#endif

#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
/*
 * Copy data used in early init routines from the initial arrays to the
 * per cpu data areas.  These arrays then become expendable and the
 * *_early_ptr's are zeroed indicating that the static arrays are gone.
 */
static void __init setup_per_cpu_maps(void)
{
	int cpu;

	for_each_possible_cpu(cpu) {
		per_cpu(x86_cpu_to_apicid, cpu) =
				early_per_cpu_map(x86_cpu_to_apicid, cpu);
		per_cpu(x86_bios_cpu_apicid, cpu) =
				early_per_cpu_map(x86_bios_cpu_apicid, cpu);
#ifdef X86_64_NUMA
		per_cpu(x86_cpu_to_node_map, cpu) =
				early_per_cpu_map(x86_cpu_to_node_map, cpu);
#endif
	}

	/* indicate the early static arrays will soon be gone */
	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
#ifdef X86_64_NUMA
	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
#endif
}

#ifdef CONFIG_X86_32
/*
 * Great future not-so-futuristic plan: make i386 and x86_64 do it
 * the same way
 */
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
static inline void setup_cpu_pda_map(void) { }

#elif !defined(CONFIG_SMP)
static inline void setup_cpu_pda_map(void) { }

#else /* CONFIG_SMP && CONFIG_X86_64 */

/*
 * Allocate cpu_pda pointer table and array via alloc_bootmem.
 */
static void __init setup_cpu_pda_map(void)
{
	char *pda;
	struct x8664_pda **new_cpu_pda;
	unsigned long size;
	int cpu;

	size = roundup(sizeof(struct x8664_pda), cache_line_size());

	/* allocate cpu_pda array and pointer table */
	{
		unsigned long tsize = nr_cpu_ids * sizeof(void *);
		unsigned long asize = size * (nr_cpu_ids - 1);

		tsize = roundup(tsize, cache_line_size());
		new_cpu_pda = alloc_bootmem(tsize + asize);
		pda = (char *)new_cpu_pda + tsize;
	}

	/* initialize pointer table to static pda's */
	for_each_possible_cpu(cpu) {
		if (cpu == 0) {
			/* leave boot cpu pda in place */
			new_cpu_pda[0] = cpu_pda(0);
			continue;
		}
		new_cpu_pda[cpu] = (struct x8664_pda *)pda;
		new_cpu_pda[cpu]->in_bootmem = 1;
		pda += size;
	}

	/* point to new pointer table */
	_cpu_pda = new_cpu_pda;
}
#endif

/*
 * Great future plan:
 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
 * Always point %gs to its beginning
 */
void __init setup_per_cpu_areas(void)
{
	ssize_t size = PERCPU_ENOUGH_ROOM;
	char *ptr;
	int cpu;

	/* Setup cpu_pda map */
	setup_cpu_pda_map();

	/* Copy section for each CPU (we discard the original) */
	size = PERCPU_ENOUGH_ROOM;
	printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
			  size);

	for_each_possible_cpu(cpu) {
#ifndef CONFIG_NEED_MULTIPLE_NODES
		ptr = alloc_bootmem_pages(size);
#else
		int node = early_cpu_to_node(cpu);
		if (!node_online(node) || !NODE_DATA(node)) {
			ptr = alloc_bootmem_pages(size);
			printk(KERN_INFO
			       "cpu %d has no node %d or node-local memory\n",
				cpu, node);
			if (ptr)
				printk(KERN_DEBUG "per cpu data for cpu%d at %016lx\n",
					 cpu, __pa(ptr));
		}
		else {
			ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
			if (ptr)
				printk(KERN_DEBUG "per cpu data for cpu%d on node%d at %016lx\n",
					 cpu, node, __pa(ptr));
		}
#endif
		per_cpu_offset(cpu) = ptr - __per_cpu_start;
		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);

	}

	printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
		NR_CPUS, nr_cpu_ids, nr_node_ids);

	/* Setup percpu data maps */
	setup_per_cpu_maps();

	/* Setup node to cpumask map */
	setup_node_to_cpumask_map();
}

#endif

#ifdef X86_64_NUMA

/*
 * Allocate node_to_cpumask_map based on number of available nodes
 * Requires node_possible_map to be valid.
 *
 * Note: node_to_cpumask() is not valid until after this is done.
 */
static void __init setup_node_to_cpumask_map(void)
{
	unsigned int node, num = 0;
	cpumask_t *map;

	/* setup nr_node_ids if not done yet */
	if (nr_node_ids == MAX_NUMNODES) {
		for_each_node_mask(node, node_possible_map)
			num = node;
		nr_node_ids = num + 1;
	}

	/* allocate the map */
	map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));

	pr_debug(KERN_DEBUG "Node to cpumask map at %p for %d nodes\n",
		 map, nr_node_ids);

	/* node_to_cpumask() will now work */
	node_to_cpumask_map = map;
}

void __cpuinit numa_set_node(int cpu, int node)
{
	int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);

	if (cpu_pda(cpu) && node != NUMA_NO_NODE)
		cpu_pda(cpu)->nodenumber = node;

	if (cpu_to_node_map)
		cpu_to_node_map[cpu] = node;

	else if (per_cpu_offset(cpu))
		per_cpu(x86_cpu_to_node_map, cpu) = node;

	else
		pr_debug("Setting node for non-present cpu %d\n", cpu);
}

void __cpuinit numa_clear_node(int cpu)
{
	numa_set_node(cpu, NUMA_NO_NODE);
}

#ifndef CONFIG_DEBUG_PER_CPU_MAPS

void __cpuinit numa_add_cpu(int cpu)
{
	cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
}

void __cpuinit numa_remove_cpu(int cpu)
{
	cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
}

#else /* CONFIG_DEBUG_PER_CPU_MAPS */

/*
 * --------- debug versions of the numa functions ---------
 */
static void __cpuinit numa_set_cpumask(int cpu, int enable)
{
	int node = cpu_to_node(cpu);
	cpumask_t *mask;
	char buf[64];

	if (node_to_cpumask_map == NULL) {
		printk(KERN_ERR "node_to_cpumask_map NULL\n");
		dump_stack();
		return;
	}

	mask = &node_to_cpumask_map[node];
	if (enable)
		cpu_set(cpu, *mask);
	else
		cpu_clear(cpu, *mask);

	cpulist_scnprintf(buf, sizeof(buf), *mask);
	printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
		enable? "numa_add_cpu":"numa_remove_cpu", cpu, node, buf);
 }

void __cpuinit numa_add_cpu(int cpu)
{
	numa_set_cpumask(cpu, 1);
}

void __cpuinit numa_remove_cpu(int cpu)
{
	numa_set_cpumask(cpu, 0);
}

int cpu_to_node(int cpu)
{
	if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
		printk(KERN_WARNING
			"cpu_to_node(%d): usage too early!\n", cpu);
		dump_stack();
		return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
	}
	return per_cpu(x86_cpu_to_node_map, cpu);
}
EXPORT_SYMBOL(cpu_to_node);

/*
 * Same function as cpu_to_node() but used if called before the
 * per_cpu areas are setup.
 */
int early_cpu_to_node(int cpu)
{
	if (early_per_cpu_ptr(x86_cpu_to_node_map))
		return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];

	if (!per_cpu_offset(cpu)) {
		printk(KERN_WARNING
			"early_cpu_to_node(%d): no per_cpu area!\n", cpu);
		dump_stack();
		return NUMA_NO_NODE;
	}
	return per_cpu(x86_cpu_to_node_map, cpu);
}


/* empty cpumask */
static const cpumask_t cpu_mask_none;

/*
 * Returns a pointer to the bitmask of CPUs on Node 'node'.
 */
const cpumask_t *_node_to_cpumask_ptr(int node)
{
	if (node_to_cpumask_map == NULL) {
		printk(KERN_WARNING
			"_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n",
			node);
		dump_stack();
		return (const cpumask_t *)&cpu_online_map;
	}
	if (node >= nr_node_ids) {
		printk(KERN_WARNING
			"_node_to_cpumask_ptr(%d): node > nr_node_ids(%d)\n",
			node, nr_node_ids);
		dump_stack();
		return &cpu_mask_none;
	}
	return &node_to_cpumask_map[node];
}
EXPORT_SYMBOL(_node_to_cpumask_ptr);

/*
 * Returns a bitmask of CPUs on Node 'node'.
 *
 * Side note: this function creates the returned cpumask on the stack
 * so with a high NR_CPUS count, excessive stack space is used.  The
 * node_to_cpumask_ptr function should be used whenever possible.
 */
cpumask_t node_to_cpumask(int node)
{
	if (node_to_cpumask_map == NULL) {
		printk(KERN_WARNING
			"node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
		dump_stack();
		return cpu_online_map;
	}
	if (node >= nr_node_ids) {
		printk(KERN_WARNING
			"node_to_cpumask(%d): node > nr_node_ids(%d)\n",
			node, nr_node_ids);
		dump_stack();
		return cpu_mask_none;
	}
	return node_to_cpumask_map[node];
}
EXPORT_SYMBOL(node_to_cpumask);

/*
 * --------- end of debug versions of the numa functions ---------
 */

#endif /* CONFIG_DEBUG_PER_CPU_MAPS */

#endif /* X86_64_NUMA */
Commit	Line	Data
4fe29a85 GOC	1	#include <linux/kernel.h>
	2	#include <linux/module.h>
	3	#include <linux/init.h>
	4	#include <linux/bootmem.h>
	5	#include <linux/percpu.h>
1ecd2765	6	#include <linux/kexec.h>
17b4cceb	7	#include <linux/crash_dump.h>
4fe29a85 GOC	8	#include <asm/smp.h>
	9	#include <asm/percpu.h>
	10	#include <asm/sections.h>
	11	#include <asm/processor.h>
	12	#include <asm/setup.h>
	13	#include <asm/topology.h>
0fc0906e	14	#include <asm/mpspec.h>
76eb4131	15	#include <asm/apicdef.h>
1ecd2765	16	#include <asm/highmem.h>
76eb4131	17
f8955ebe	18	#ifdef CONFIG_X86_LOCAL_APIC
2fe60147 AS	19	unsigned int num_processors;
	20	unsigned disabled_cpus __cpuinitdata;
	21	/* Processor that is doing the boot up */
	22	unsigned int boot_cpu_physical_apicid = -1U;
e0da3364	23	unsigned int max_physical_apicid;
2fe60147 AS	24	EXPORT_SYMBOL(boot_cpu_physical_apicid);
2fe60147 AS	25
0fc0906e AS	26	/* Bitmask of physically existing CPUs */
0fc0906e AS	27	physid_mask_t phys_cpu_present_map;
f8955ebe	28	#endif
0fc0906e	29
23ca4bba MT	30	/* map cpu index to physical APIC ID */
	31	DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
	32	DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
	33	EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
	34	EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
	35
	36	#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
	37	#define X86_64_NUMA 1
	38
7891a24e	39	/* map cpu index to node index */
23ca4bba MT	40	DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
23ca4bba MT	41	EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
9f248bde MT	42
	43	/* which logical CPUs are on which nodes */
	44	cpumask_t *node_to_cpumask_map;
	45	EXPORT_SYMBOL(node_to_cpumask_map);
	46
	47	/* setup node_to_cpumask_map */
	48	static void __init setup_node_to_cpumask_map(void);
	49
	50	#else
	51	static inline void setup_node_to_cpumask_map(void) { }
23ca4bba MT	52	#endif
23ca4bba MT	53
f8955ebe	54	#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
4fe29a85 GOC	55	/*
	56	* Copy data used in early init routines from the initial arrays to the
	57	* per cpu data areas. These arrays then become expendable and the
	58	* *_early_ptr's are zeroed indicating that the static arrays are gone.
	59	*/
	60	static void __init setup_per_cpu_maps(void)
	61	{
	62	int cpu;
	63
	64	for_each_possible_cpu(cpu) {
23ca4bba MT	65	per_cpu(x86_cpu_to_apicid, cpu) =
23ca4bba MT	66	early_per_cpu_map(x86_cpu_to_apicid, cpu);
b447a468	67	per_cpu(x86_bios_cpu_apicid, cpu) =
23ca4bba MT	68	early_per_cpu_map(x86_bios_cpu_apicid, cpu);
23ca4bba MT	69	#ifdef X86_64_NUMA
b447a468	70	per_cpu(x86_cpu_to_node_map, cpu) =
23ca4bba	71	early_per_cpu_map(x86_cpu_to_node_map, cpu);
4fe29a85 GOC	72	#endif
	73	}
	74
	75	/* indicate the early static arrays will soon be gone */
23ca4bba MT	76	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
	77	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
	78	#ifdef X86_64_NUMA
	79	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
4fe29a85 GOC	80	#endif
	81	}
	82
	83	#ifdef CONFIG_X86_32
	84	/*
	85	* Great future not-so-futuristic plan: make i386 and x86_64 do it
	86	* the same way
	87	*/
	88	unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
	89	EXPORT_SYMBOL(__per_cpu_offset);
3461b0af MT	90	static inline void setup_cpu_pda_map(void) { }
	91
	92	#elif !defined(CONFIG_SMP)
	93	static inline void setup_cpu_pda_map(void) { }
	94
	95	#else /* CONFIG_SMP && CONFIG_X86_64 */
	96
	97	/*
	98	* Allocate cpu_pda pointer table and array via alloc_bootmem.
	99	*/
	100	static void __init setup_cpu_pda_map(void)
	101	{
	102	char *pda;
	103	struct x8664_pda **new_cpu_pda;
	104	unsigned long size;
	105	int cpu;
	106
	107	size = roundup(sizeof(struct x8664_pda), cache_line_size());
	108
	109	/* allocate cpu_pda array and pointer table */
	110	{
	111	unsigned long tsize = nr_cpu_ids * sizeof(void *);
	112	unsigned long asize = size * (nr_cpu_ids - 1);
	113
	114	tsize = roundup(tsize, cache_line_size());
	115	new_cpu_pda = alloc_bootmem(tsize + asize);
	116	pda = (char *)new_cpu_pda + tsize;
	117	}
	118
	119	/* initialize pointer table to static pda's */
	120	for_each_possible_cpu(cpu) {
	121	if (cpu == 0) {
	122	/* leave boot cpu pda in place */
	123	new_cpu_pda[0] = cpu_pda(0);
	124	continue;
	125	}
	126	new_cpu_pda[cpu] = (struct x8664_pda *)pda;
	127	new_cpu_pda[cpu]->in_bootmem = 1;
	128	pda += size;
	129	}
	130
	131	/* point to new pointer table */
	132	_cpu_pda = new_cpu_pda;
	133	}
4fe29a85 GOC	134	#endif
	135
	136	/*
	137	* Great future plan:
	138	* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
	139	* Always point %gs to its beginning
	140	*/
	141	void __init setup_per_cpu_areas(void)
	142	{
3461b0af MT	143	ssize_t size = PERCPU_ENOUGH_ROOM;
	144	char *ptr;
	145	int cpu;
4fe29a85	146
3461b0af MT	147	/* Setup cpu_pda map */
	148	setup_cpu_pda_map();
	149
4fe29a85 GOC	150	/* Copy section for each CPU (we discard the original) */
4fe29a85 GOC	151	size = PERCPU_ENOUGH_ROOM;
053713f5	152	printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
4fe29a85	153	size);
b447a468	154
3461b0af	155	for_each_possible_cpu(cpu) {
4fe29a85 GOC	156	#ifndef CONFIG_NEED_MULTIPLE_NODES
	157	ptr = alloc_bootmem_pages(size);
	158	#else
3461b0af	159	int node = early_cpu_to_node(cpu);
b447a468	160	if (!node_online(node) \|\| !NODE_DATA(node)) {
4fe29a85	161	ptr = alloc_bootmem_pages(size);
b447a468	162	printk(KERN_INFO
23ca4bba	163	"cpu %d has no node %d or node-local memory\n",
3461b0af	164	cpu, node);
a677f58a YL	165	if (ptr)
	166	printk(KERN_DEBUG "per cpu data for cpu%d at %016lx\n",
	167	cpu, __pa(ptr));
b447a468	168	}
a677f58a	169	else {
4fe29a85	170	ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
a677f58a YL	171	if (ptr)
	172	printk(KERN_DEBUG "per cpu data for cpu%d on node%d at %016lx\n",
	173	cpu, node, __pa(ptr));
	174	}
4fe29a85	175	#endif
3461b0af	176	per_cpu_offset(cpu) = ptr - __per_cpu_start;
4fe29a85	177	memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
9f0e8d04	178
4fe29a85 GOC	179	}
4fe29a85 GOC	180
9f248bde MT	181	printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
9f248bde MT	182	NR_CPUS, nr_cpu_ids, nr_node_ids);
9f0e8d04	183
b447a468	184	/* Setup percpu data maps */
4fe29a85	185	setup_per_cpu_maps();
9f0e8d04	186
9f248bde MT	187	/* Setup node to cpumask map */
9f248bde MT	188	setup_node_to_cpumask_map();
4fe29a85 GOC	189	}
	190
	191	#endif
c45a707d	192
23ca4bba	193	#ifdef X86_64_NUMA
9f248bde MT	194
	195	/*
	196	* Allocate node_to_cpumask_map based on number of available nodes
	197	* Requires node_possible_map to be valid.
	198	*
	199	* Note: node_to_cpumask() is not valid until after this is done.
	200	*/
	201	static void __init setup_node_to_cpumask_map(void)
	202	{
	203	unsigned int node, num = 0;
	204	cpumask_t *map;
	205
	206	/* setup nr_node_ids if not done yet */
	207	if (nr_node_ids == MAX_NUMNODES) {
	208	for_each_node_mask(node, node_possible_map)
	209	num = node;
	210	nr_node_ids = num + 1;
	211	}
	212
	213	/* allocate the map */
	214	map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
	215
cfc1b9a6 TG	216	pr_debug(KERN_DEBUG "Node to cpumask map at %p for %d nodes\n",
cfc1b9a6 TG	217	map, nr_node_ids);
9f248bde MT	218
	219	/* node_to_cpumask() will now work */
	220	node_to_cpumask_map = map;
	221	}
	222
23ca4bba MT	223	void __cpuinit numa_set_node(int cpu, int node)
	224	{
	225	int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
	226
3461b0af	227	if (cpu_pda(cpu) && node != NUMA_NO_NODE)
7891a24e MT	228	cpu_pda(cpu)->nodenumber = node;
7891a24e MT	229
23ca4bba MT	230	if (cpu_to_node_map)
	231	cpu_to_node_map[cpu] = node;
	232
	233	else if (per_cpu_offset(cpu))
	234	per_cpu(x86_cpu_to_node_map, cpu) = node;
	235
	236	else
cfc1b9a6	237	pr_debug("Setting node for non-present cpu %d\n", cpu);
23ca4bba MT	238	}
	239
	240	void __cpuinit numa_clear_node(int cpu)
	241	{
	242	numa_set_node(cpu, NUMA_NO_NODE);
	243	}
	244
9f248bde MT	245	#ifndef CONFIG_DEBUG_PER_CPU_MAPS
9f248bde MT	246
23ca4bba MT	247	void __cpuinit numa_add_cpu(int cpu)
	248	{
	249	cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
	250	}
	251
	252	void __cpuinit numa_remove_cpu(int cpu)
	253	{
	254	cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
	255	}
23ca4bba	256
9f248bde MT	257	#else /* CONFIG_DEBUG_PER_CPU_MAPS */
	258
	259	/*
	260	* --------- debug versions of the numa functions ---------
	261	*/
	262	static void __cpuinit numa_set_cpumask(int cpu, int enable)
	263	{
	264	int node = cpu_to_node(cpu);
	265	cpumask_t *mask;
	266	char buf[64];
	267
	268	if (node_to_cpumask_map == NULL) {
	269	printk(KERN_ERR "node_to_cpumask_map NULL\n");
	270	dump_stack();
	271	return;
	272	}
	273
	274	mask = &node_to_cpumask_map[node];
	275	if (enable)
	276	cpu_set(cpu, *mask);
	277	else
	278	cpu_clear(cpu, *mask);
	279
	280	cpulist_scnprintf(buf, sizeof(buf), *mask);
	281	printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
	282	enable? "numa_add_cpu":"numa_remove_cpu", cpu, node, buf);
	283	}
	284
	285	void __cpuinit numa_add_cpu(int cpu)
	286	{
	287	numa_set_cpumask(cpu, 1);
	288	}
	289
	290	void __cpuinit numa_remove_cpu(int cpu)
	291	{
	292	numa_set_cpumask(cpu, 0);
	293	}
23ca4bba MT	294
	295	int cpu_to_node(int cpu)
	296	{
	297	if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
	298	printk(KERN_WARNING
	299	"cpu_to_node(%d): usage too early!\n", cpu);
	300	dump_stack();
	301	return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
	302	}
	303	return per_cpu(x86_cpu_to_node_map, cpu);
	304	}
	305	EXPORT_SYMBOL(cpu_to_node);
	306
9f248bde MT	307	/*
	308	* Same function as cpu_to_node() but used if called before the
	309	* per_cpu areas are setup.
	310	*/
23ca4bba MT	311	int early_cpu_to_node(int cpu)
	312	{
	313	if (early_per_cpu_ptr(x86_cpu_to_node_map))
	314	return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
	315
	316	if (!per_cpu_offset(cpu)) {
	317	printk(KERN_WARNING
	318	"early_cpu_to_node(%d): no per_cpu area!\n", cpu);
9f248bde	319	dump_stack();
23ca4bba MT	320	return NUMA_NO_NODE;
	321	}
	322	return per_cpu(x86_cpu_to_node_map, cpu);
	323	}
9f248bde	324
6a2f47ca MT	325
	326	/* empty cpumask */
	327	static const cpumask_t cpu_mask_none;
	328
9f248bde MT	329	/*
	330	* Returns a pointer to the bitmask of CPUs on Node 'node'.
	331	*/
11369f35	332	const cpumask_t *_node_to_cpumask_ptr(int node)
9f248bde MT	333	{
	334	if (node_to_cpumask_map == NULL) {
	335	printk(KERN_WARNING
	336	"_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n",
	337	node);
	338	dump_stack();
11369f35	339	return (const cpumask_t *)&cpu_online_map;
9f248bde	340	}
6a2f47ca MT	341	if (node >= nr_node_ids) {
	342	printk(KERN_WARNING
	343	"_node_to_cpumask_ptr(%d): node > nr_node_ids(%d)\n",
	344	node, nr_node_ids);
	345	dump_stack();
11369f35	346	return &cpu_mask_none;
6a2f47ca	347	}
11369f35	348	return &node_to_cpumask_map[node];
9f248bde MT	349	}
	350	EXPORT_SYMBOL(_node_to_cpumask_ptr);
	351
	352	/*
	353	* Returns a bitmask of CPUs on Node 'node'.
6a2f47ca MT	354	*
	355	* Side note: this function creates the returned cpumask on the stack
	356	* so with a high NR_CPUS count, excessive stack space is used. The
	357	* node_to_cpumask_ptr function should be used whenever possible.
9f248bde MT	358	*/
	359	cpumask_t node_to_cpumask(int node)
	360	{
	361	if (node_to_cpumask_map == NULL) {
	362	printk(KERN_WARNING
	363	"node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
	364	dump_stack();
	365	return cpu_online_map;
	366	}
6a2f47ca MT	367	if (node >= nr_node_ids) {
	368	printk(KERN_WARNING
	369	"node_to_cpumask(%d): node > nr_node_ids(%d)\n",
	370	node, nr_node_ids);
	371	dump_stack();
	372	return cpu_mask_none;
	373	}
9f248bde MT	374	return node_to_cpumask_map[node];
	375	}
	376	EXPORT_SYMBOL(node_to_cpumask);
	377
	378	/*
	379	* --------- end of debug versions of the numa functions ---------
	380	*/
	381
	382	#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
	383
	384	#endif /* X86_64_NUMA */
1ecd2765	385