[net-next-2.6.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 <linux/smp.h>
#include <linux/topology.h>
#include <asm/sections.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/highmem.h>
#include <asm/cpumask.h>

#ifdef CONFIG_DEBUG_PER_CPU_MAPS
# define DBG(x...) printk(KERN_DEBUG x)
#else
# define DBG(x...)
#endif

#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;
EXPORT_SYMBOL(boot_cpu_physical_apicid);
unsigned int max_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	/* (used later) */

/*
 * 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

#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
/*
 * 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;
	unsigned long size;
	int cpu;

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

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

		pda = alloc_bootmem(asize);
	}

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

#endif /* CONFIG_SMP && CONFIG_X86_64 */

#ifdef CONFIG_X86_64

/* correctly size the local cpu masks */
static void setup_cpu_local_masks(void)
{
	alloc_bootmem_cpumask_var(&cpu_initialized_mask);
	alloc_bootmem_cpumask_var(&cpu_callin_mask);
	alloc_bootmem_cpumask_var(&cpu_callout_mask);
	alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
}

#else /* CONFIG_X86_32 */

static inline void setup_cpu_local_masks(void)
{
}

#endif /* CONFIG_X86_32 */

/*
 * 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, old_size;
	char *ptr;
	int cpu;
	unsigned long align = 1;

	/* Setup cpu_pda map */
	setup_cpu_pda_map();

	/* Copy section for each CPU (we discard the original) */
	old_size = PERCPU_ENOUGH_ROOM;
	align = max_t(unsigned long, PAGE_SIZE, align);
	size = roundup(old_size, align);

	pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
		NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);

	pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);

	for_each_possible_cpu(cpu) {
#ifndef CONFIG_NEED_MULTIPLE_NODES
		ptr = __alloc_bootmem(size, align,
				 __pa(MAX_DMA_ADDRESS));
#else
		int node = early_cpu_to_node(cpu);
		if (!node_online(node) || !NODE_DATA(node)) {
			ptr = __alloc_bootmem(size, align,
					 __pa(MAX_DMA_ADDRESS));
			pr_info("cpu %d has no node %d or node-local memory\n",
				cpu, node);
			pr_debug("per cpu data for cpu%d at %016lx\n",
				 cpu, __pa(ptr));
		} else {
			ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
							__pa(MAX_DMA_ADDRESS));
			pr_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_load, __per_cpu_end - __per_cpu_start);

		DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
	}

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

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

	/* Setup cpu initialized, callin, callout masks */
	setup_cpu_local_masks();
}

#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.
 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
 */
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));
	DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);

	pr_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);

	/* early setting, no percpu area yet */
	if (cpu_to_node_map) {
		cpu_to_node_map[cpu] = node;
		return;
	}

#ifdef CONFIG_DEBUG_PER_CPU_MAPS
	if (cpu >= nr_cpu_ids || !per_cpu_offset(cpu)) {
		printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
		dump_stack();
		return;
	}
#endif
	per_cpu(x86_cpu_to_node_map, cpu) = node;

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

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[early_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 = early_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 *cpumask_of_node(int node)
{
	if (node_to_cpumask_map == NULL) {
		printk(KERN_WARNING
			"cpumask_of_node(%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
			"cpumask_of_node(%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(cpumask_of_node);

/*
 * 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>
8a87dd9a JSR	8	#include <linux/smp.h>
8a87dd9a JSR	9	#include <linux/topology.h>
4fe29a85 GOC	10	#include <asm/sections.h>
	11	#include <asm/processor.h>
	12	#include <asm/setup.h>
0fc0906e	13	#include <asm/mpspec.h>
76eb4131	14	#include <asm/apicdef.h>
1ecd2765	15	#include <asm/highmem.h>
06879033	16	#include <asm/cpumask.h>
76eb4131	17
c90aa894 MT	18	#ifdef CONFIG_DEBUG_PER_CPU_MAPS
	19	# define DBG(x...) printk(KERN_DEBUG x)
	20	#else
	21	# define DBG(x...)
	22	#endif
	23
f8955ebe	24	#ifdef CONFIG_X86_LOCAL_APIC
2fe60147 AS	25	unsigned int num_processors;
	26	unsigned disabled_cpus __cpuinitdata;
	27	/* Processor that is doing the boot up */
	28	unsigned int boot_cpu_physical_apicid = -1U;
	29	EXPORT_SYMBOL(boot_cpu_physical_apicid);
8a87dd9a	30	unsigned int max_physical_apicid;
2fe60147	31
0fc0906e AS	32	/* Bitmask of physically existing CPUs */
0fc0906e AS	33	physid_mask_t phys_cpu_present_map;
f8955ebe	34	#endif
0fc0906e	35
c90aa894 MT	36	/*
	37	* Map cpu index to physical APIC ID
	38	*/
23ca4bba MT	39	DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
	40	DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
	41	EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
	42	EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
	43
	44	#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
c90aa894	45	#define X86_64_NUMA 1 /* (used later) */
23ca4bba	46
c90aa894 MT	47	/*
	48	* Map cpu index to node index
	49	*/
23ca4bba MT	50	DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
23ca4bba MT	51	EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
9f248bde	52
c90aa894 MT	53	/*
	54	* Which logical CPUs are on which nodes
	55	*/
9f248bde MT	56	cpumask_t *node_to_cpumask_map;
	57	EXPORT_SYMBOL(node_to_cpumask_map);
	58
c90aa894 MT	59	/*
	60	* Setup node_to_cpumask_map
	61	*/
9f248bde MT	62	static void __init setup_node_to_cpumask_map(void);
	63
	64	#else
	65	static inline void setup_node_to_cpumask_map(void) { }
23ca4bba MT	66	#endif
23ca4bba MT	67
c90aa894	68	#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
4fe29a85 GOC	69	/*
	70	* Copy data used in early init routines from the initial arrays to the
	71	* per cpu data areas. These arrays then become expendable and the
	72	* *_early_ptr's are zeroed indicating that the static arrays are gone.
	73	*/
	74	static void __init setup_per_cpu_maps(void)
	75	{
	76	int cpu;
	77
	78	for_each_possible_cpu(cpu) {
23ca4bba MT	79	per_cpu(x86_cpu_to_apicid, cpu) =
23ca4bba MT	80	early_per_cpu_map(x86_cpu_to_apicid, cpu);
b447a468	81	per_cpu(x86_bios_cpu_apicid, cpu) =
23ca4bba MT	82	early_per_cpu_map(x86_bios_cpu_apicid, cpu);
23ca4bba MT	83	#ifdef X86_64_NUMA
b447a468	84	per_cpu(x86_cpu_to_node_map, cpu) =
23ca4bba	85	early_per_cpu_map(x86_cpu_to_node_map, cpu);
4fe29a85 GOC	86	#endif
	87	}
	88
	89	/* indicate the early static arrays will soon be gone */
23ca4bba MT	90	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
	91	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
	92	#ifdef X86_64_NUMA
	93	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
4fe29a85 GOC	94	#endif
	95	}
	96
	97	#ifdef CONFIG_X86_32
	98	/*
	99	* Great future not-so-futuristic plan: make i386 and x86_64 do it
	100	* the same way
	101	*/
	102	unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
	103	EXPORT_SYMBOL(__per_cpu_offset);
3461b0af MT	104	static inline void setup_cpu_pda_map(void) { }
	105
	106	#elif !defined(CONFIG_SMP)
	107	static inline void setup_cpu_pda_map(void) { }
	108
	109	#else /* CONFIG_SMP && CONFIG_X86_64 */
	110
	111	/*
	112	* Allocate cpu_pda pointer table and array via alloc_bootmem.
	113	*/
	114	static void __init setup_cpu_pda_map(void)
	115	{
	116	char *pda;
3461b0af MT	117	unsigned long size;
	118	int cpu;
	119
	120	size = roundup(sizeof(struct x8664_pda), cache_line_size());
	121
	122	/* allocate cpu_pda array and pointer table */
	123	{
3461b0af MT	124	unsigned long asize = size * (nr_cpu_ids - 1);
3461b0af MT	125
c8f3329a	126	pda = alloc_bootmem(asize);
3461b0af MT	127	}
	128
	129	/* initialize pointer table to static pda's */
	130	for_each_possible_cpu(cpu) {
	131	if (cpu == 0) {
	132	/* leave boot cpu pda in place */
3461b0af MT	133	continue;
3461b0af MT	134	}
c8f3329a TH	135	cpu_pda(cpu) = (struct x8664_pda *)pda;
c8f3329a TH	136	cpu_pda(cpu)->in_bootmem = 1;
3461b0af MT	137	pda += size;
3461b0af MT	138	}
3461b0af	139	}
c2d1cec1 MT	140
	141	#endif /* CONFIG_SMP && CONFIG_X86_64 */
	142
	143	#ifdef CONFIG_X86_64
	144
	145	/* correctly size the local cpu masks */
	146	static void setup_cpu_local_masks(void)
	147	{
	148	alloc_bootmem_cpumask_var(&cpu_initialized_mask);
	149	alloc_bootmem_cpumask_var(&cpu_callin_mask);
	150	alloc_bootmem_cpumask_var(&cpu_callout_mask);
	151	alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
	152	}
	153
	154	#else /* CONFIG_X86_32 */
	155
	156	static inline void setup_cpu_local_masks(void)
	157	{
	158	}
	159
	160	#endif /* CONFIG_X86_32 */
4fe29a85 GOC	161
	162	/*
	163	* Great future plan:
	164	* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
	165	* Always point %gs to its beginning
	166	*/
	167	void __init setup_per_cpu_areas(void)
	168	{
d6c88a50	169	ssize_t size, old_size;
3461b0af MT	170	char *ptr;
3461b0af MT	171	int cpu;
1f8ff037	172	unsigned long align = 1;
4fe29a85	173
3461b0af MT	174	/* Setup cpu_pda map */
	175	setup_cpu_pda_map();
	176
4fe29a85	177	/* Copy section for each CPU (we discard the original) */
1f3fcd4b	178	old_size = PERCPU_ENOUGH_ROOM;
1f8ff037	179	align = max_t(unsigned long, PAGE_SIZE, align);
d6c88a50	180	size = roundup(old_size, align);
a1681965	181
ab14398a	182	pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
a1681965 MT	183	NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
a1681965 MT	184
ab14398a	185	pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
b447a468	186
3461b0af	187	for_each_possible_cpu(cpu) {
4fe29a85	188	#ifndef CONFIG_NEED_MULTIPLE_NODES
1f8ff037 YL	189	ptr = __alloc_bootmem(size, align,
1f8ff037 YL	190	__pa(MAX_DMA_ADDRESS));
4fe29a85	191	#else
3461b0af	192	int node = early_cpu_to_node(cpu);
b447a468	193	if (!node_online(node) \|\| !NODE_DATA(node)) {
1f8ff037 YL	194	ptr = __alloc_bootmem(size, align,
1f8ff037 YL	195	__pa(MAX_DMA_ADDRESS));
ab14398a	196	pr_info("cpu %d has no node %d or node-local memory\n",
3461b0af	197	cpu, node);
ab14398a CG	198	pr_debug("per cpu data for cpu%d at %016lx\n",
	199	cpu, __pa(ptr));
	200	} else {
1f8ff037 YL	201	ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
1f8ff037 YL	202	__pa(MAX_DMA_ADDRESS));
ab14398a CG	203	pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
ab14398a CG	204	cpu, node, __pa(ptr));
a677f58a	205	}
4fe29a85	206	#endif
3461b0af	207	per_cpu_offset(cpu) = ptr - __per_cpu_start;
3e5d8f97	208	memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
c90aa894 MT	209
c90aa894 MT	210	DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
4fe29a85 GOC	211	}
4fe29a85 GOC	212
b447a468	213	/* Setup percpu data maps */
4fe29a85	214	setup_per_cpu_maps();
9f0e8d04	215
9f248bde MT	216	/* Setup node to cpumask map */
9f248bde MT	217	setup_node_to_cpumask_map();
c2d1cec1 MT	218
	219	/* Setup cpu initialized, callin, callout masks */
	220	setup_cpu_local_masks();
4fe29a85 GOC	221	}
	222
	223	#endif
c45a707d	224
23ca4bba	225	#ifdef X86_64_NUMA
9f248bde MT	226
	227	/*
	228	* Allocate node_to_cpumask_map based on number of available nodes
	229	* Requires node_possible_map to be valid.
	230	*
	231	* Note: node_to_cpumask() is not valid until after this is done.
c90aa894	232	* (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
9f248bde MT	233	*/
	234	static void __init setup_node_to_cpumask_map(void)
	235	{
	236	unsigned int node, num = 0;
	237	cpumask_t *map;
	238
	239	/* setup nr_node_ids if not done yet */
	240	if (nr_node_ids == MAX_NUMNODES) {
	241	for_each_node_mask(node, node_possible_map)
	242	num = node;
	243	nr_node_ids = num + 1;
	244	}
	245
	246	/* allocate the map */
	247	map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
c90aa894	248	DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
9f248bde	249
55410791	250	pr_debug("Node to cpumask map at %p for %d nodes\n",
cfc1b9a6	251	map, nr_node_ids);
9f248bde MT	252
	253	/* node_to_cpumask() will now work */
	254	node_to_cpumask_map = map;
	255	}
	256
23ca4bba MT	257	void __cpuinit numa_set_node(int cpu, int node)
	258	{
	259	int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
	260
c90aa894 MT	261	/* early setting, no percpu area yet */
c90aa894 MT	262	if (cpu_to_node_map) {
23ca4bba	263	cpu_to_node_map[cpu] = node;
c90aa894 MT	264	return;
c90aa894 MT	265	}
23ca4bba	266
c90aa894 MT	267	#ifdef CONFIG_DEBUG_PER_CPU_MAPS
	268	if (cpu >= nr_cpu_ids \|\| !per_cpu_offset(cpu)) {
	269	printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
	270	dump_stack();
	271	return;
	272	}
	273	#endif
	274	per_cpu(x86_cpu_to_node_map, cpu) = node;
23ca4bba	275
c90aa894 MT	276	if (node != NUMA_NO_NODE)
c90aa894 MT	277	cpu_pda(cpu)->nodenumber = node;
23ca4bba MT	278	}
	279
	280	void __cpuinit numa_clear_node(int cpu)
	281	{
	282	numa_set_node(cpu, NUMA_NO_NODE);
	283	}
	284
9f248bde MT	285	#ifndef CONFIG_DEBUG_PER_CPU_MAPS
9f248bde MT	286
23ca4bba MT	287	void __cpuinit numa_add_cpu(int cpu)
	288	{
	289	cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
	290	}
	291
	292	void __cpuinit numa_remove_cpu(int cpu)
	293	{
c90aa894	294	cpu_clear(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
23ca4bba	295	}
23ca4bba	296
9f248bde MT	297	#else /* CONFIG_DEBUG_PER_CPU_MAPS */
	298
	299	/*
	300	* --------- debug versions of the numa functions ---------
	301	*/
	302	static void __cpuinit numa_set_cpumask(int cpu, int enable)
	303	{
c90aa894	304	int node = early_cpu_to_node(cpu);
9f248bde MT	305	cpumask_t *mask;
	306	char buf[64];
	307
	308	if (node_to_cpumask_map == NULL) {
	309	printk(KERN_ERR "node_to_cpumask_map NULL\n");
	310	dump_stack();
	311	return;
	312	}
	313
	314	mask = &node_to_cpumask_map[node];
	315	if (enable)
	316	cpu_set(cpu, *mask);
	317	else
	318	cpu_clear(cpu, *mask);
	319
29c0177e	320	cpulist_scnprintf(buf, sizeof(buf), mask);
9f248bde	321	printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
8a87dd9a JSR	322	enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
8a87dd9a JSR	323	}
9f248bde MT	324
	325	void __cpuinit numa_add_cpu(int cpu)
	326	{
	327	numa_set_cpumask(cpu, 1);
	328	}
	329
	330	void __cpuinit numa_remove_cpu(int cpu)
	331	{
	332	numa_set_cpumask(cpu, 0);
	333	}
23ca4bba MT	334
	335	int cpu_to_node(int cpu)
	336	{
	337	if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
	338	printk(KERN_WARNING
	339	"cpu_to_node(%d): usage too early!\n", cpu);
	340	dump_stack();
	341	return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
	342	}
	343	return per_cpu(x86_cpu_to_node_map, cpu);
	344	}
	345	EXPORT_SYMBOL(cpu_to_node);
	346
9f248bde MT	347	/*
	348	* Same function as cpu_to_node() but used if called before the
	349	* per_cpu areas are setup.
	350	*/
23ca4bba MT	351	int early_cpu_to_node(int cpu)
	352	{
	353	if (early_per_cpu_ptr(x86_cpu_to_node_map))
	354	return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
	355
	356	if (!per_cpu_offset(cpu)) {
	357	printk(KERN_WARNING
	358	"early_cpu_to_node(%d): no per_cpu area!\n", cpu);
9f248bde	359	dump_stack();
23ca4bba MT	360	return NUMA_NO_NODE;
	361	}
	362	return per_cpu(x86_cpu_to_node_map, cpu);
	363	}
9f248bde	364
6a2f47ca MT	365
	366	/* empty cpumask */
	367	static const cpumask_t cpu_mask_none;
	368
9f248bde MT	369	/*
	370	* Returns a pointer to the bitmask of CPUs on Node 'node'.
	371	*/
393d68fb	372	const cpumask_t *cpumask_of_node(int node)
9f248bde MT	373	{
	374	if (node_to_cpumask_map == NULL) {
	375	printk(KERN_WARNING
393d68fb	376	"cpumask_of_node(%d): no node_to_cpumask_map!\n",
9f248bde MT	377	node);
9f248bde MT	378	dump_stack();
11369f35	379	return (const cpumask_t *)&cpu_online_map;
9f248bde	380	}
6a2f47ca MT	381	if (node >= nr_node_ids) {
6a2f47ca MT	382	printk(KERN_WARNING
393d68fb	383	"cpumask_of_node(%d): node > nr_node_ids(%d)\n",
6a2f47ca MT	384	node, nr_node_ids);
6a2f47ca MT	385	dump_stack();
11369f35	386	return &cpu_mask_none;
6a2f47ca	387	}
11369f35	388	return &node_to_cpumask_map[node];
9f248bde	389	}
393d68fb	390	EXPORT_SYMBOL(cpumask_of_node);
9f248bde MT	391
	392	/*
	393	* Returns a bitmask of CPUs on Node 'node'.
6a2f47ca MT	394	*
	395	* Side note: this function creates the returned cpumask on the stack
	396	* so with a high NR_CPUS count, excessive stack space is used. The
	397	* node_to_cpumask_ptr function should be used whenever possible.
9f248bde MT	398	*/
	399	cpumask_t node_to_cpumask(int node)
	400	{
	401	if (node_to_cpumask_map == NULL) {
	402	printk(KERN_WARNING
	403	"node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
	404	dump_stack();
	405	return cpu_online_map;
	406	}
6a2f47ca MT	407	if (node >= nr_node_ids) {
	408	printk(KERN_WARNING
	409	"node_to_cpumask(%d): node > nr_node_ids(%d)\n",
	410	node, nr_node_ids);
	411	dump_stack();
	412	return cpu_mask_none;
	413	}
9f248bde MT	414	return node_to_cpumask_map[node];
	415	}
	416	EXPORT_SYMBOL(node_to_cpumask);
	417
	418	/*
	419	* --------- end of debug versions of the numa functions ---------
	420	*/
	421
	422	#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
	423
	424	#endif /* X86_64_NUMA */
1ecd2765	425