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Commit | Line | Data |
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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> |
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> |
1a51e3a0 | 16 | #include <asm/proto.h> |
06879033 | 17 | #include <asm/cpumask.h> |
34019be1 | 18 | #include <asm/cpu.h> |
60a5317f | 19 | #include <asm/stackprotector.h> |
76eb4131 | 20 | |
c90aa894 MT |
21 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
22 | # define DBG(x...) printk(KERN_DEBUG x) | |
23 | #else | |
24 | # define DBG(x...) | |
25 | #endif | |
26 | ||
ea927906 BG |
27 | DEFINE_PER_CPU(int, cpu_number); |
28 | EXPORT_PER_CPU_SYMBOL(cpu_number); | |
ea927906 | 29 | |
1688401a BG |
30 | #ifdef CONFIG_X86_64 |
31 | #define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load) | |
32 | #else | |
33 | #define BOOT_PERCPU_OFFSET 0 | |
34 | #endif | |
35 | ||
36 | DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET; | |
37 | EXPORT_PER_CPU_SYMBOL(this_cpu_off); | |
38 | ||
9939ddaf | 39 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = { |
34019be1 | 40 | [0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET, |
9939ddaf | 41 | }; |
9939ddaf | 42 | EXPORT_SYMBOL(__per_cpu_offset); |
4fe29a85 | 43 | |
8d408b4b TH |
44 | static struct page **pcpu4k_pages __initdata; |
45 | static int pcpu4k_nr_static_pages __initdata; | |
46 | ||
47 | static struct page * __init pcpu4k_get_page(unsigned int cpu, int pageno) | |
48 | { | |
49 | if (pageno < pcpu4k_nr_static_pages) | |
50 | return pcpu4k_pages[cpu * pcpu4k_nr_static_pages + pageno]; | |
51 | return NULL; | |
52 | } | |
53 | ||
458a3e64 TH |
54 | static void __init pcpu4k_populate_pte(unsigned long addr) |
55 | { | |
56 | populate_extra_pte(addr); | |
57 | } | |
58 | ||
b2d2f431 BG |
59 | static inline void setup_percpu_segment(int cpu) |
60 | { | |
61 | #ifdef CONFIG_X86_32 | |
62 | struct desc_struct gdt; | |
63 | ||
64 | pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF, | |
65 | 0x2 | DESCTYPE_S, 0x8); | |
66 | gdt.s = 1; | |
67 | write_gdt_entry(get_cpu_gdt_table(cpu), | |
68 | GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S); | |
69 | #endif | |
70 | } | |
71 | ||
4fe29a85 GOC |
72 | /* |
73 | * Great future plan: | |
74 | * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. | |
75 | * Always point %gs to its beginning | |
76 | */ | |
77 | void __init setup_per_cpu_areas(void) | |
78 | { | |
11124411 TH |
79 | ssize_t size = __per_cpu_end - __per_cpu_start; |
80 | unsigned int nr_cpu_pages = DIV_ROUND_UP(size, PAGE_SIZE); | |
81 | static struct page **pages; | |
82 | size_t pages_size; | |
83 | unsigned int cpu, i, j; | |
84 | unsigned long delta; | |
85 | size_t pcpu_unit_size; | |
a1681965 | 86 | |
ab14398a | 87 | pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n", |
a1681965 | 88 | NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids); |
11124411 | 89 | pr_info("PERCPU: Allocating %zd bytes for static per cpu data\n", size); |
a1681965 | 90 | |
11124411 TH |
91 | pages_size = nr_cpu_pages * num_possible_cpus() * sizeof(pages[0]); |
92 | pages = alloc_bootmem(pages_size); | |
b447a468 | 93 | |
11124411 | 94 | j = 0; |
3461b0af | 95 | for_each_possible_cpu(cpu) { |
11124411 TH |
96 | void *ptr; |
97 | ||
98 | for (i = 0; i < nr_cpu_pages; i++) { | |
4fe29a85 | 99 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
11124411 | 100 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
4fe29a85 | 101 | #else |
11124411 TH |
102 | int node = early_cpu_to_node(cpu); |
103 | ||
104 | if (!node_online(node) || !NODE_DATA(node)) { | |
105 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
106 | pr_info("cpu %d has no node %d or node-local " | |
107 | "memory\n", cpu, node); | |
108 | pr_debug("per cpu data for cpu%d at %016lx\n", | |
109 | cpu, __pa(ptr)); | |
110 | } else { | |
111 | ptr = alloc_bootmem_pages_node(NODE_DATA(node), | |
112 | PAGE_SIZE); | |
113 | pr_debug("per cpu data for cpu%d on node%d " | |
114 | "at %016lx\n", cpu, node, __pa(ptr)); | |
115 | } | |
4fe29a85 | 116 | #endif |
11124411 TH |
117 | memcpy(ptr, __per_cpu_load + i * PAGE_SIZE, PAGE_SIZE); |
118 | pages[j++] = virt_to_page(ptr); | |
119 | } | |
120 | } | |
121 | ||
8d408b4b TH |
122 | pcpu4k_pages = pages; |
123 | pcpu4k_nr_static_pages = nr_cpu_pages; | |
124 | pcpu_unit_size = pcpu_setup_first_chunk(pcpu4k_get_page, size, 0, 0, | |
125 | NULL, pcpu4k_populate_pte); | |
1a51e3a0 | 126 | |
11124411 TH |
127 | free_bootmem(__pa(pages), pages_size); |
128 | ||
129 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; | |
130 | for_each_possible_cpu(cpu) { | |
131 | per_cpu_offset(cpu) = delta + cpu * pcpu_unit_size; | |
26f80bd6 | 132 | per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu); |
ea927906 | 133 | per_cpu(cpu_number, cpu) = cpu; |
b2d2f431 | 134 | setup_percpu_segment(cpu); |
60a5317f | 135 | setup_stack_canary_segment(cpu); |
0d77e7f0 | 136 | /* |
cf3997f5 TH |
137 | * Copy data used in early init routines from the |
138 | * initial arrays to the per cpu data areas. These | |
139 | * arrays then become expendable and the *_early_ptr's | |
140 | * are zeroed indicating that the static arrays are | |
141 | * gone. | |
0d77e7f0 | 142 | */ |
ec70de8b | 143 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 | 144 | per_cpu(x86_cpu_to_apicid, cpu) = |
cf3997f5 | 145 | early_per_cpu_map(x86_cpu_to_apicid, cpu); |
0d77e7f0 | 146 | per_cpu(x86_bios_cpu_apicid, cpu) = |
cf3997f5 | 147 | early_per_cpu_map(x86_bios_cpu_apicid, cpu); |
ec70de8b | 148 | #endif |
1a51e3a0 | 149 | #ifdef CONFIG_X86_64 |
26f80bd6 | 150 | per_cpu(irq_stack_ptr, cpu) = |
cf3997f5 TH |
151 | per_cpu(irq_stack_union.irq_stack, cpu) + |
152 | IRQ_STACK_SIZE - 64; | |
6470aff6 BG |
153 | #ifdef CONFIG_NUMA |
154 | per_cpu(x86_cpu_to_node_map, cpu) = | |
cf3997f5 | 155 | early_per_cpu_map(x86_cpu_to_node_map, cpu); |
2697fbd5 | 156 | #endif |
6470aff6 | 157 | #endif |
1a51e3a0 | 158 | /* |
34019be1 | 159 | * Up to this point, the boot CPU has been using .data.init |
2697fbd5 | 160 | * area. Reload any changed state for the boot CPU. |
1a51e3a0 | 161 | */ |
34019be1 | 162 | if (cpu == boot_cpu_id) |
552be871 | 163 | switch_to_new_gdt(cpu); |
c90aa894 MT |
164 | |
165 | DBG("PERCPU: cpu %4d %p\n", cpu, ptr); | |
4fe29a85 GOC |
166 | } |
167 | ||
0d77e7f0 | 168 | /* indicate the early static arrays will soon be gone */ |
22f25138 | 169 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 BG |
170 | early_per_cpu_ptr(x86_cpu_to_apicid) = NULL; |
171 | early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL; | |
22f25138 | 172 | #endif |
6470aff6 | 173 | #if defined(CONFIG_X86_64) && defined(CONFIG_NUMA) |
0d77e7f0 BG |
174 | early_per_cpu_ptr(x86_cpu_to_node_map) = NULL; |
175 | #endif | |
9f0e8d04 | 176 | |
9f248bde MT |
177 | /* Setup node to cpumask map */ |
178 | setup_node_to_cpumask_map(); | |
c2d1cec1 MT |
179 | |
180 | /* Setup cpu initialized, callin, callout masks */ | |
181 | setup_cpu_local_masks(); | |
4fe29a85 | 182 | } |