[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 <linux/smp.h>
#include <linux/topology.h>
#include <linux/pfn.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/proto.h>
#include <asm/cpumask.h>
#include <asm/cpu.h>
#include <asm/stackprotector.h>

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

DEFINE_PER_CPU(int, cpu_number);
EXPORT_PER_CPU_SYMBOL(cpu_number);

#ifdef CONFIG_X86_64
#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
#else
#define BOOT_PERCPU_OFFSET 0
#endif

DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
EXPORT_PER_CPU_SYMBOL(this_cpu_off);

unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
	[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
};
EXPORT_SYMBOL(__per_cpu_offset);

/*
 * On x86_64 symbols referenced from code should be reachable using
 * 32bit relocations.  Reserve space for static percpu variables in
 * modules so that they are always served from the first chunk which
 * is located at the percpu segment base.  On x86_32, anything can
 * address anywhere.  No need to reserve space in the first chunk.
 */
#ifdef CONFIG_X86_64
#define PERCPU_FIRST_CHUNK_RESERVE	PERCPU_MODULE_RESERVE
#else
#define PERCPU_FIRST_CHUNK_RESERVE	0
#endif

/**
 * pcpu_need_numa - determine percpu allocation needs to consider NUMA
 *
 * If NUMA is not configured or there is only one NUMA node available,
 * there is no reason to consider NUMA.  This function determines
 * whether percpu allocation should consider NUMA or not.
 *
 * RETURNS:
 * true if NUMA should be considered; otherwise, false.
 */
static bool __init pcpu_need_numa(void)
{
#ifdef CONFIG_NEED_MULTIPLE_NODES
	pg_data_t *last = NULL;
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		int node = early_cpu_to_node(cpu);

		if (node_online(node) && NODE_DATA(node) &&
		    last && last != NODE_DATA(node))
			return true;

		last = NODE_DATA(node);
	}
#endif
	return false;
}

/**
 * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
 * @cpu: cpu to allocate for
 * @size: size allocation in bytes
 * @align: alignment
 *
 * Allocate @size bytes aligned at @align for cpu @cpu.  This wrapper
 * does the right thing for NUMA regardless of the current
 * configuration.
 *
 * RETURNS:
 * Pointer to the allocated area on success, NULL on failure.
 */
static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
					unsigned long align)
{
	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
#ifdef CONFIG_NEED_MULTIPLE_NODES
	int node = early_cpu_to_node(cpu);
	void *ptr;

	if (!node_online(node) || !NODE_DATA(node)) {
		ptr = __alloc_bootmem_nopanic(size, align, goal);
		pr_info("cpu %d has no node %d or node-local memory\n",
			cpu, node);
		pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
			 cpu, size, __pa(ptr));
	} else {
		ptr = __alloc_bootmem_node_nopanic(NODE_DATA(node),
						   size, align, goal);
		pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
			 "%016lx\n", cpu, size, node, __pa(ptr));
	}
	return ptr;
#else
	return __alloc_bootmem_nopanic(size, align, goal);
#endif
}

/*
 * Helpers for first chunk memory allocation
 */
static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
{
	return pcpu_alloc_bootmem(cpu, size, align);
}

static void __init pcpu_fc_free(void *ptr, size_t size)
{
	free_bootmem(__pa(ptr), size);
}

/*
 * Large page remapping allocator
 */
#ifdef CONFIG_NEED_MULTIPLE_NODES
static void __init pcpul_map(void *ptr, size_t size, void *addr)
{
	pmd_t *pmd, pmd_v;

	pmd = populate_extra_pmd((unsigned long)addr);
	pmd_v = pfn_pmd(page_to_pfn(virt_to_page(ptr)), PAGE_KERNEL_LARGE);
	set_pmd(pmd, pmd_v);
}

static int pcpu_lpage_cpu_distance(unsigned int from, unsigned int to)
{
	if (early_cpu_to_node(from) == early_cpu_to_node(to))
		return LOCAL_DISTANCE;
	else
		return REMOTE_DISTANCE;
}

static ssize_t __init setup_pcpu_lpage(bool chosen)
{
	size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
	size_t dyn_size = reserve - PERCPU_FIRST_CHUNK_RESERVE;
	struct pcpu_alloc_info *ai;
	ssize_t ret;

	/* on non-NUMA, embedding is better */
	if (!chosen && !pcpu_need_numa())
		return -EINVAL;

	/* need PSE */
	if (!cpu_has_pse) {
		pr_warning("PERCPU: lpage allocator requires PSE\n");
		return -EINVAL;
	}

	/* allocate and build unit_map */
	ai = pcpu_build_alloc_info(PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
				   PMD_SIZE, pcpu_lpage_cpu_distance);
	if (IS_ERR(ai)) {
		pr_warning("PERCPU: failed to build unit_map (%ld)\n",
			   PTR_ERR(ai));
		return PTR_ERR(ai);
	}

	/* do the parameters look okay? */
	if (!chosen) {
		size_t vm_size = VMALLOC_END - VMALLOC_START;
		size_t tot_size = 0;
		int group;

		for (group = 0; group < ai->nr_groups; group++)
			tot_size += ai->unit_size * ai->groups[group].nr_units;

		/* don't consume more than 20% of vmalloc area */
		if (tot_size > vm_size / 5) {
			pr_info("PERCPU: too large chunk size %zuMB for "
				"large page remap\n", tot_size >> 20);
			ret = -EINVAL;
			goto out_free;
		}
	}

	ret = pcpu_lpage_first_chunk(ai, pcpu_fc_alloc, pcpu_fc_free,
				     pcpul_map);
out_free:
	pcpu_free_alloc_info(ai);
	return ret;
}
#else
static ssize_t __init setup_pcpu_lpage(bool chosen)
{
	return -EINVAL;
}
#endif

/*
 * Embedding allocator
 *
 * The first chunk is sized to just contain the static area plus
 * module and dynamic reserves and embedded into linear physical
 * mapping so that it can use PMD mapping without additional TLB
 * pressure.
 */
static ssize_t __init setup_pcpu_embed(bool chosen)
{
	size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;

	/*
	 * If large page isn't supported, there's no benefit in doing
	 * this.  Also, embedding allocation doesn't play well with
	 * NUMA.
	 */
	if (!chosen && (!cpu_has_pse || pcpu_need_numa()))
		return -EINVAL;

	return pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
				      reserve - PERCPU_FIRST_CHUNK_RESERVE);
}

/*
 * Page allocator
 *
 * Boring fallback 4k page allocator.  This allocator puts more
 * pressure on PTE TLBs but other than that behaves nicely on both UMA
 * and NUMA.
 */
static void __init pcpup_populate_pte(unsigned long addr)
{
	populate_extra_pte(addr);
}

static ssize_t __init setup_pcpu_page(void)
{
	return pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
				     pcpu_fc_alloc, pcpu_fc_free,
				     pcpup_populate_pte);
}

static inline void setup_percpu_segment(int cpu)
{
#ifdef CONFIG_X86_32
	struct desc_struct gdt;

	pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
			0x2 | DESCTYPE_S, 0x8);
	gdt.s = 1;
	write_gdt_entry(get_cpu_gdt_table(cpu),
			GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
#endif
}

void __init setup_per_cpu_areas(void)
{
	unsigned int cpu;
	unsigned long delta;
	size_t pcpu_unit_size;
	ssize_t ret;

	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);

	/*
	 * Allocate percpu area.  If PSE is supported, try to make use
	 * of large page mappings.  Please read comments on top of
	 * each allocator for details.
	 */
	ret = -EINVAL;
	if (pcpu_chosen_fc != PCPU_FC_AUTO) {
		if (pcpu_chosen_fc != PCPU_FC_PAGE) {
			if (pcpu_chosen_fc == PCPU_FC_LPAGE)
				ret = setup_pcpu_lpage(true);
			else
				ret = setup_pcpu_embed(true);

			if (ret < 0)
				pr_warning("PERCPU: %s allocator failed (%zd), "
					   "falling back to page size\n",
					   pcpu_fc_names[pcpu_chosen_fc], ret);
		}
	} else {
		ret = setup_pcpu_lpage(false);
		if (ret < 0)
			ret = setup_pcpu_embed(false);
	}
	if (ret < 0)
		ret = setup_pcpu_page();
	if (ret < 0)
		panic("cannot initialize percpu area (err=%zd)", ret);

	pcpu_unit_size = ret;

	/* alrighty, percpu areas up and running */
	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
	for_each_possible_cpu(cpu) {
		per_cpu_offset(cpu) =
			delta + pcpu_unit_map[cpu] * pcpu_unit_size;
		per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
		per_cpu(cpu_number, cpu) = cpu;
		setup_percpu_segment(cpu);
		setup_stack_canary_segment(cpu);
		/*
		 * 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.
		 */
#ifdef CONFIG_X86_LOCAL_APIC
		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);
#endif
#ifdef CONFIG_X86_64
		per_cpu(irq_stack_ptr, cpu) =
			per_cpu(irq_stack_union.irq_stack, cpu) +
			IRQ_STACK_SIZE - 64;
#ifdef CONFIG_NUMA
		per_cpu(x86_cpu_to_node_map, cpu) =
			early_per_cpu_map(x86_cpu_to_node_map, cpu);
#endif
#endif
		/*
		 * Up to this point, the boot CPU has been using .data.init
		 * area.  Reload any changed state for the boot CPU.
		 */
		if (cpu == boot_cpu_id)
			switch_to_new_gdt(cpu);
	}

	/* indicate the early static arrays will soon be gone */
#ifdef CONFIG_X86_LOCAL_APIC
	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
#endif
#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
#endif

#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
	/*
	 * make sure boot cpu node_number is right, when boot cpu is on the
	 * node that doesn't have mem installed
	 */
	per_cpu(node_number, boot_cpu_id) = cpu_to_node(boot_cpu_id);
#endif

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

	/* Setup cpu initialized, callin, callout masks */
	setup_cpu_local_masks();
}
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>
5f5d8405	10	#include <linux/pfn.h>
4fe29a85 GOC	11	#include <asm/sections.h>
	12	#include <asm/processor.h>
	13	#include <asm/setup.h>
0fc0906e	14	#include <asm/mpspec.h>
76eb4131	15	#include <asm/apicdef.h>
1ecd2765	16	#include <asm/highmem.h>
1a51e3a0	17	#include <asm/proto.h>
06879033	18	#include <asm/cpumask.h>
34019be1	19	#include <asm/cpu.h>
60a5317f	20	#include <asm/stackprotector.h>
76eb4131	21
c90aa894 MT	22	#ifdef CONFIG_DEBUG_PER_CPU_MAPS
	23	# define DBG(x...) printk(KERN_DEBUG x)
	24	#else
	25	# define DBG(x...)
	26	#endif
	27
ea927906 BG	28	DEFINE_PER_CPU(int, cpu_number);
ea927906 BG	29	EXPORT_PER_CPU_SYMBOL(cpu_number);
ea927906	30
1688401a BG	31	#ifdef CONFIG_X86_64
	32	#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
	33	#else
	34	#define BOOT_PERCPU_OFFSET 0
	35	#endif
	36
	37	DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
	38	EXPORT_PER_CPU_SYMBOL(this_cpu_off);
	39
9939ddaf	40	unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
34019be1	41	[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
9939ddaf	42	};
9939ddaf	43	EXPORT_SYMBOL(__per_cpu_offset);
4fe29a85	44
6b19b0c2 TH	45	/*
	46	* On x86_64 symbols referenced from code should be reachable using
	47	* 32bit relocations. Reserve space for static percpu variables in
	48	* modules so that they are always served from the first chunk which
	49	* is located at the percpu segment base. On x86_32, anything can
	50	* address anywhere. No need to reserve space in the first chunk.
	51	*/
	52	#ifdef CONFIG_X86_64
	53	#define PERCPU_FIRST_CHUNK_RESERVE PERCPU_MODULE_RESERVE
	54	#else
	55	#define PERCPU_FIRST_CHUNK_RESERVE 0
	56	#endif
	57
89c92151 TH	58	/**
	59	* pcpu_need_numa - determine percpu allocation needs to consider NUMA
	60	*
	61	* If NUMA is not configured or there is only one NUMA node available,
	62	* there is no reason to consider NUMA. This function determines
	63	* whether percpu allocation should consider NUMA or not.
	64	*
	65	* RETURNS:
	66	* true if NUMA should be considered; otherwise, false.
	67	*/
	68	static bool __init pcpu_need_numa(void)
	69	{
	70	#ifdef CONFIG_NEED_MULTIPLE_NODES
	71	pg_data_t *last = NULL;
	72	unsigned int cpu;
	73
	74	for_each_possible_cpu(cpu) {
	75	int node = early_cpu_to_node(cpu);
	76
	77	if (node_online(node) && NODE_DATA(node) &&
	78	last && last != NODE_DATA(node))
	79	return true;
	80
	81	last = NODE_DATA(node);
	82	}
	83	#endif
	84	return false;
	85	}
	86
5f5d8405 TH	87	/**
	88	* pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
	89	* @cpu: cpu to allocate for
	90	* @size: size allocation in bytes
	91	* @align: alignment
	92	*
	93	* Allocate @size bytes aligned at @align for cpu @cpu. This wrapper
	94	* does the right thing for NUMA regardless of the current
	95	* configuration.
	96	*
	97	* RETURNS:
	98	* Pointer to the allocated area on success, NULL on failure.
	99	*/
	100	static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
	101	unsigned long align)
	102	{
	103	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
	104	#ifdef CONFIG_NEED_MULTIPLE_NODES
	105	int node = early_cpu_to_node(cpu);
	106	void *ptr;
	107
	108	if (!node_online(node) \|\| !NODE_DATA(node)) {
	109	ptr = __alloc_bootmem_nopanic(size, align, goal);
	110	pr_info("cpu %d has no node %d or node-local memory\n",
	111	cpu, node);
	112	pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
	113	cpu, size, __pa(ptr));
	114	} else {
	115	ptr = __alloc_bootmem_node_nopanic(NODE_DATA(node),
	116	size, align, goal);
	117	pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
	118	"%016lx\n", cpu, size, node, __pa(ptr));
	119	}
	120	return ptr;
	121	#else
	122	return __alloc_bootmem_nopanic(size, align, goal);
	123	#endif
	124	}
	125
d4b95f80 TH	126	/*
	127	* Helpers for first chunk memory allocation
	128	*/
3cbc8565	129	static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
d4b95f80	130	{
3cbc8565	131	return pcpu_alloc_bootmem(cpu, size, align);
d4b95f80 TH	132	}
	133
	134	static void __init pcpu_fc_free(void *ptr, size_t size)
	135	{
	136	free_bootmem(__pa(ptr), size);
	137	}
	138
8ac83757	139	/*
8c4bfc6e	140	* Large page remapping allocator
8ac83757 TH	141	*/
8ac83757 TH	142	#ifdef CONFIG_NEED_MULTIPLE_NODES
8c4bfc6e	143	static void __init pcpul_map(void ptr, size_t size, void addr)
8ac83757	144	{
8c4bfc6e	145	pmd_t *pmd, pmd_v;
8ac83757	146
8c4bfc6e TH	147	pmd = populate_extra_pmd((unsigned long)addr);
	148	pmd_v = pfn_pmd(page_to_pfn(virt_to_page(ptr)), PAGE_KERNEL_LARGE);
	149	set_pmd(pmd, pmd_v);
8ac83757 TH	150	}
8ac83757 TH	151
a530b795 TH	152	static int pcpu_lpage_cpu_distance(unsigned int from, unsigned int to)
	153	{
	154	if (early_cpu_to_node(from) == early_cpu_to_node(to))
	155	return LOCAL_DISTANCE;
	156	else
	157	return REMOTE_DISTANCE;
	158	}
	159
9a773769	160	static ssize_t __init setup_pcpu_lpage(bool chosen)
8ac83757	161	{
8c4bfc6e	162	size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
a530b795	163	size_t dyn_size = reserve - PERCPU_FIRST_CHUNK_RESERVE;
fd1e8a1f	164	struct pcpu_alloc_info *ai;
a530b795 TH	165	ssize_t ret;
	166
	167	/* on non-NUMA, embedding is better */
	168	if (!chosen && !pcpu_need_numa())
	169	return -EINVAL;
	170
	171	/* need PSE */
	172	if (!cpu_has_pse) {
	173	pr_warning("PERCPU: lpage allocator requires PSE\n");
	174	return -EINVAL;
	175	}
8ac83757	176
a530b795	177	/* allocate and build unit_map */
fd1e8a1f TH	178	ai = pcpu_build_alloc_info(PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
	179	PMD_SIZE, pcpu_lpage_cpu_distance);
	180	if (IS_ERR(ai)) {
	181	pr_warning("PERCPU: failed to build unit_map (%ld)\n",
	182	PTR_ERR(ai));
	183	return PTR_ERR(ai);
a530b795 TH	184	}
a530b795 TH	185
a530b795	186	/* do the parameters look okay? */
0017c869 TH	187	if (!chosen) {
0017c869 TH	188	size_t vm_size = VMALLOC_END - VMALLOC_START;
fd1e8a1f TH	189	size_t tot_size = 0;
	190	int group;
	191
	192	for (group = 0; group < ai->nr_groups; group++)
	193	tot_size += ai->unit_size * ai->groups[group].nr_units;
0017c869 TH	194
	195	/* don't consume more than 20% of vmalloc area */
	196	if (tot_size > vm_size / 5) {
	197	pr_info("PERCPU: too large chunk size %zuMB for "
	198	"large page remap\n", tot_size >> 20);
a530b795 TH	199	ret = -EINVAL;
a530b795 TH	200	goto out_free;
0017c869 TH	201	}
0017c869 TH	202	}
8ac83757	203
fd1e8a1f TH	204	ret = pcpu_lpage_first_chunk(ai, pcpu_fc_alloc, pcpu_fc_free,
fd1e8a1f TH	205	pcpul_map);
a530b795	206	out_free:
fd1e8a1f	207	pcpu_free_alloc_info(ai);
a530b795	208	return ret;
8ac83757 TH	209	}
8ac83757 TH	210	#else
9a773769	211	static ssize_t __init setup_pcpu_lpage(bool chosen)
8ac83757 TH	212	{
	213	return -EINVAL;
	214	}
	215	#endif
	216
89c92151 TH	217	/*
	218	* Embedding allocator
	219	*
	220	* The first chunk is sized to just contain the static area plus
66c3a757 TH	221	* module and dynamic reserves and embedded into linear physical
	222	* mapping so that it can use PMD mapping without additional TLB
	223	* pressure.
89c92151	224	*/
9a773769	225	static ssize_t __init setup_pcpu_embed(bool chosen)
89c92151	226	{
66c3a757	227	size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
89c92151 TH	228
	229	/*
	230	* If large page isn't supported, there's no benefit in doing
	231	* this. Also, embedding allocation doesn't play well with
	232	* NUMA.
	233	*/
fa8a7094	234	if (!chosen && (!cpu_has_pse \|\| pcpu_need_numa()))
89c92151 TH	235	return -EINVAL;
89c92151 TH	236
9a773769	237	return pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
788e5abc	238	reserve - PERCPU_FIRST_CHUNK_RESERVE);
89c92151 TH	239	}
89c92151 TH	240
5f5d8405	241	/*
00ae4064	242	* Page allocator
5f5d8405	243	*
00ae4064 TH	244	* Boring fallback 4k page allocator. This allocator puts more
	245	* pressure on PTE TLBs but other than that behaves nicely on both UMA
	246	* and NUMA.
5f5d8405	247	*/
00ae4064	248	static void __init pcpup_populate_pte(unsigned long addr)
458a3e64 TH	249	{
	250	populate_extra_pte(addr);
	251	}
	252
9a773769	253	static ssize_t __init setup_pcpu_page(void)
5f5d8405	254	{
9a773769	255	return pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
00ae4064 TH	256	pcpu_fc_alloc, pcpu_fc_free,
00ae4064 TH	257	pcpup_populate_pte);
5f5d8405 TH	258	}
5f5d8405 TH	259
b2d2f431 BG	260	static inline void setup_percpu_segment(int cpu)
	261	{
	262	#ifdef CONFIG_X86_32
	263	struct desc_struct gdt;
	264
	265	pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF,
	266	0x2 \| DESCTYPE_S, 0x8);
	267	gdt.s = 1;
	268	write_gdt_entry(get_cpu_gdt_table(cpu),
	269	GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
	270	#endif
	271	}
	272
4fe29a85 GOC	273	void __init setup_per_cpu_areas(void)
4fe29a85 GOC	274	{
5f5d8405	275	unsigned int cpu;
11124411 TH	276	unsigned long delta;
11124411 TH	277	size_t pcpu_unit_size;
5f5d8405	278	ssize_t ret;
a1681965	279
ab14398a	280	pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
a1681965	281	NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
11124411	282
8ac83757 TH	283	/*
	284	* Allocate percpu area. If PSE is supported, try to make use
	285	* of large page mappings. Please read comments on top of
	286	* each allocator for details.
	287	*/
fa8a7094	288	ret = -EINVAL;
f58dc01b TH	289	if (pcpu_chosen_fc != PCPU_FC_AUTO) {
	290	if (pcpu_chosen_fc != PCPU_FC_PAGE) {
	291	if (pcpu_chosen_fc == PCPU_FC_LPAGE)
9a773769	292	ret = setup_pcpu_lpage(true);
fa8a7094	293	else
9a773769	294	ret = setup_pcpu_embed(true);
f58dc01b	295
fa8a7094 TH	296	if (ret < 0)
fa8a7094 TH	297	pr_warning("PERCPU: %s allocator failed (%zd), "
00ae4064	298	"falling back to page size\n",
f58dc01b	299	pcpu_fc_names[pcpu_chosen_fc], ret);
fa8a7094 TH	300	}
fa8a7094 TH	301	} else {
9a773769	302	ret = setup_pcpu_lpage(false);
fa8a7094	303	if (ret < 0)
9a773769	304	ret = setup_pcpu_embed(false);
fa8a7094	305	}
89c92151	306	if (ret < 0)
9a773769	307	ret = setup_pcpu_page();
5f5d8405	308	if (ret < 0)
9a773769	309	panic("cannot initialize percpu area (err=%zd)", ret);
1a51e3a0	310
5f5d8405	311	pcpu_unit_size = ret;
11124411	312
5f5d8405	313	/* alrighty, percpu areas up and running */
11124411 TH	314	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
11124411 TH	315	for_each_possible_cpu(cpu) {
a530b795 TH	316	per_cpu_offset(cpu) =
a530b795 TH	317	delta + pcpu_unit_map[cpu] * pcpu_unit_size;
26f80bd6	318	per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
ea927906	319	per_cpu(cpu_number, cpu) = cpu;
b2d2f431	320	setup_percpu_segment(cpu);
60a5317f	321	setup_stack_canary_segment(cpu);
0d77e7f0	322	/*
cf3997f5 TH	323	* Copy data used in early init routines from the
	324	* initial arrays to the per cpu data areas. These
	325	* arrays then become expendable and the *_early_ptr's
	326	* are zeroed indicating that the static arrays are
	327	* gone.
0d77e7f0	328	*/
ec70de8b	329	#ifdef CONFIG_X86_LOCAL_APIC
0d77e7f0	330	per_cpu(x86_cpu_to_apicid, cpu) =
cf3997f5	331	early_per_cpu_map(x86_cpu_to_apicid, cpu);
0d77e7f0	332	per_cpu(x86_bios_cpu_apicid, cpu) =
cf3997f5	333	early_per_cpu_map(x86_bios_cpu_apicid, cpu);
ec70de8b	334	#endif
1a51e3a0	335	#ifdef CONFIG_X86_64
26f80bd6	336	per_cpu(irq_stack_ptr, cpu) =
cf3997f5 TH	337	per_cpu(irq_stack_union.irq_stack, cpu) +
cf3997f5 TH	338	IRQ_STACK_SIZE - 64;
6470aff6 BG	339	#ifdef CONFIG_NUMA
6470aff6 BG	340	per_cpu(x86_cpu_to_node_map, cpu) =
cf3997f5	341	early_per_cpu_map(x86_cpu_to_node_map, cpu);
2697fbd5	342	#endif
6470aff6	343	#endif
1a51e3a0	344	/*
34019be1	345	* Up to this point, the boot CPU has been using .data.init
2697fbd5	346	* area. Reload any changed state for the boot CPU.
1a51e3a0	347	*/
34019be1	348	if (cpu == boot_cpu_id)
552be871	349	switch_to_new_gdt(cpu);
4fe29a85 GOC	350	}
4fe29a85 GOC	351
0d77e7f0	352	/* indicate the early static arrays will soon be gone */
22f25138	353	#ifdef CONFIG_X86_LOCAL_APIC
0d77e7f0 BG	354	early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
0d77e7f0 BG	355	early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
22f25138	356	#endif
6470aff6	357	#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
0d77e7f0 BG	358	early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
0d77e7f0 BG	359	#endif
9f0e8d04	360
35d5a9a6 YL	361	#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
	362	/*
	363	* make sure boot cpu node_number is right, when boot cpu is on the
	364	* node that doesn't have mem installed
	365	*/
	366	per_cpu(node_number, boot_cpu_id) = cpu_to_node(boot_cpu_id);
	367	#endif
	368
9f248bde MT	369	/* Setup node to cpumask map */
9f248bde MT	370	setup_node_to_cpumask_map();
c2d1cec1 MT	371
	372	/* Setup cpu initialized, callin, callout masks */
	373	setup_cpu_local_masks();
4fe29a85	374	}