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>
7 #include <asm/percpu.h>
8 #include <asm/sections.h>
9 #include <asm/processor.h>
10 #include <asm/setup.h>
11 #include <asm/topology.h>
12 #include <asm/mpspec.h>
13 #include <asm/apicdef.h>
15 #ifdef CONFIG_X86_LOCAL_APIC
16 unsigned int num_processors
;
17 unsigned disabled_cpus __cpuinitdata
;
18 /* Processor that is doing the boot up */
19 unsigned int boot_cpu_physical_apicid
= -1U;
20 EXPORT_SYMBOL(boot_cpu_physical_apicid
);
22 /* Bitmask of physically existing CPUs */
23 physid_mask_t phys_cpu_present_map
;
26 /* map cpu index to physical APIC ID */
27 DEFINE_EARLY_PER_CPU(u16
, x86_cpu_to_apicid
, BAD_APICID
);
28 DEFINE_EARLY_PER_CPU(u16
, x86_bios_cpu_apicid
, BAD_APICID
);
29 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid
);
30 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid
);
32 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
35 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map
, NUMA_NO_NODE
);
36 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map
);
39 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
41 * Copy data used in early init routines from the initial arrays to the
42 * per cpu data areas. These arrays then become expendable and the
43 * *_early_ptr's are zeroed indicating that the static arrays are gone.
45 static void __init
setup_per_cpu_maps(void)
49 for_each_possible_cpu(cpu
) {
50 per_cpu(x86_cpu_to_apicid
, cpu
) =
51 early_per_cpu_map(x86_cpu_to_apicid
, cpu
);
52 per_cpu(x86_bios_cpu_apicid
, cpu
) =
53 early_per_cpu_map(x86_bios_cpu_apicid
, cpu
);
55 per_cpu(x86_cpu_to_node_map
, cpu
) =
56 early_per_cpu_map(x86_cpu_to_node_map
, cpu
);
60 /* indicate the early static arrays will soon be gone */
61 early_per_cpu_ptr(x86_cpu_to_apicid
) = NULL
;
62 early_per_cpu_ptr(x86_bios_cpu_apicid
) = NULL
;
64 early_per_cpu_ptr(x86_cpu_to_node_map
) = NULL
;
68 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
69 cpumask_t
*cpumask_of_cpu_map __read_mostly
;
70 EXPORT_SYMBOL(cpumask_of_cpu_map
);
72 /* requires nr_cpu_ids to be initialized */
73 static void __init
setup_cpumask_of_cpu(void)
77 /* alloc_bootmem zeroes memory */
78 cpumask_of_cpu_map
= alloc_bootmem_low(sizeof(cpumask_t
) * nr_cpu_ids
);
79 for (i
= 0; i
< nr_cpu_ids
; i
++)
80 cpu_set(i
, cpumask_of_cpu_map
[i
]);
83 static inline void setup_cpumask_of_cpu(void) { }
88 * Great future not-so-futuristic plan: make i386 and x86_64 do it
91 unsigned long __per_cpu_offset
[NR_CPUS
] __read_mostly
;
92 EXPORT_SYMBOL(__per_cpu_offset
);
97 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
98 * Always point %gs to its beginning
100 void __init
setup_per_cpu_areas(void)
102 int i
, highest_cpu
= 0;
105 #ifdef CONFIG_HOTPLUG_CPU
106 prefill_possible_map();
109 /* Copy section for each CPU (we discard the original) */
110 size
= PERCPU_ENOUGH_ROOM
;
111 printk(KERN_INFO
"PERCPU: Allocating %lu bytes of per cpu data\n",
114 for_each_possible_cpu(i
) {
116 #ifndef CONFIG_NEED_MULTIPLE_NODES
117 ptr
= alloc_bootmem_pages(size
);
119 int node
= early_cpu_to_node(i
);
120 if (!node_online(node
) || !NODE_DATA(node
)) {
121 ptr
= alloc_bootmem_pages(size
);
123 "cpu %d has no node %d or node-local memory\n",
127 ptr
= alloc_bootmem_pages_node(NODE_DATA(node
), size
);
130 panic("Cannot allocate cpu data for CPU %d\n", i
);
132 cpu_pda(i
)->data_offset
= ptr
- __per_cpu_start
;
134 __per_cpu_offset
[i
] = ptr
- __per_cpu_start
;
136 memcpy(ptr
, __per_cpu_start
, __per_cpu_end
- __per_cpu_start
);
141 nr_cpu_ids
= highest_cpu
+ 1;
142 printk(KERN_DEBUG
"NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS
, nr_cpu_ids
);
144 /* Setup percpu data maps */
145 setup_per_cpu_maps();
147 /* Setup cpumask_of_cpu map */
148 setup_cpumask_of_cpu();
154 void __cpuinit
numa_set_node(int cpu
, int node
)
156 int *cpu_to_node_map
= early_per_cpu_ptr(x86_cpu_to_node_map
);
159 cpu_to_node_map
[cpu
] = node
;
161 else if (per_cpu_offset(cpu
))
162 per_cpu(x86_cpu_to_node_map
, cpu
) = node
;
165 Dprintk(KERN_INFO
"Setting node for non-present cpu %d\n", cpu
);
168 void __cpuinit
numa_clear_node(int cpu
)
170 numa_set_node(cpu
, NUMA_NO_NODE
);
173 void __cpuinit
numa_add_cpu(int cpu
)
175 cpu_set(cpu
, node_to_cpumask_map
[early_cpu_to_node(cpu
)]);
178 void __cpuinit
numa_remove_cpu(int cpu
)
180 cpu_clear(cpu
, node_to_cpumask_map
[cpu_to_node(cpu
)]);
182 #endif /* CONFIG_NUMA */
184 #if defined(CONFIG_DEBUG_PER_CPU_MAPS) && defined(CONFIG_X86_64)
186 int cpu_to_node(int cpu
)
188 if (early_per_cpu_ptr(x86_cpu_to_node_map
)) {
190 "cpu_to_node(%d): usage too early!\n", cpu
);
192 return early_per_cpu_ptr(x86_cpu_to_node_map
)[cpu
];
194 return per_cpu(x86_cpu_to_node_map
, cpu
);
196 EXPORT_SYMBOL(cpu_to_node
);
198 int early_cpu_to_node(int cpu
)
200 if (early_per_cpu_ptr(x86_cpu_to_node_map
))
201 return early_per_cpu_ptr(x86_cpu_to_node_map
)[cpu
];
203 if (!per_cpu_offset(cpu
)) {
205 "early_cpu_to_node(%d): no per_cpu area!\n", cpu
);
209 return per_cpu(x86_cpu_to_node_map
, cpu
);