arch/x86/kernel/setup.c

   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>
   6 #include <asm/smp.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>
  14
  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);
  21
  22 /* Bitmask of physically existing CPUs */
  23 physid_mask_t phys_cpu_present_map;
  24 #endif
  25
  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);
  31
  32 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
  33 #define X86_64_NUMA     1
  34
  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);
  37 #endif
  38
  39 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
  40 /*
  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.
  44  */
  45 static void __init setup_per_cpu_maps(void)
  46 {
  47         int cpu;
  48
  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);
  54 #ifdef X86_64_NUMA
  55                 per_cpu(x86_cpu_to_node_map, cpu) =
  56                                 early_per_cpu_map(x86_cpu_to_node_map, cpu);
  57 #endif
  58         }
  59
  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;
  63 #ifdef X86_64_NUMA
  64         early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
  65 #endif
  66 }
  67
  68 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
  69 cpumask_t *cpumask_of_cpu_map __read_mostly;
  70 EXPORT_SYMBOL(cpumask_of_cpu_map);
  71
  72 /* requires nr_cpu_ids to be initialized */
  73 static void __init setup_cpumask_of_cpu(void)
  74 {
  75         int i;
  76
  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]);
  81 }
  82 #else
  83 static inline void setup_cpumask_of_cpu(void) { }
  84 #endif
  85
  86 #ifdef CONFIG_X86_32
  87 /*
  88  * Great future not-so-futuristic plan: make i386 and x86_64 do it
  89  * the same way
  90  */
  91 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
  92 EXPORT_SYMBOL(__per_cpu_offset);
  93 #endif
  94
  95 /*
  96  * Great future plan:
  97  * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
  98  * Always point %gs to its beginning
  99  */
 100 void __init setup_per_cpu_areas(void)
 101 {
 102         int i, highest_cpu = 0;
 103         unsigned long size;
 104
 105 #ifdef CONFIG_HOTPLUG_CPU
 106         prefill_possible_map();
 107 #endif
 108
 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",
 112                           size);
 113
 114         for_each_possible_cpu(i) {
 115                 char *ptr;
 116 #ifndef CONFIG_NEED_MULTIPLE_NODES
 117                 ptr = alloc_bootmem_pages(size);
 118 #else
 119                 int node = early_cpu_to_node(i);
 120                 if (!node_online(node) || !NODE_DATA(node)) {
 121                         ptr = alloc_bootmem_pages(size);
 122                         printk(KERN_INFO
 123                                "cpu %d has no node %d or node-local memory\n",
 124                                 i, node);
 125                 }
 126                 else
 127                         ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
 128 #endif
 129                 if (!ptr)
 130                         panic("Cannot allocate cpu data for CPU %d\n", i);
 131 #ifdef CONFIG_X86_64
 132                 cpu_pda(i)->data_offset = ptr - __per_cpu_start;
 133 #else
 134                 __per_cpu_offset[i] = ptr - __per_cpu_start;
 135 #endif
 136                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 137
 138                 highest_cpu = i;
 139         }
 140
 141         nr_cpu_ids = highest_cpu + 1;
 142         printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
 143
 144         /* Setup percpu data maps */
 145         setup_per_cpu_maps();
 146
 147         /* Setup cpumask_of_cpu map */
 148         setup_cpumask_of_cpu();
 149 }
 150
 151 #endif
 152
 153 #ifdef X86_64_NUMA
 154 void __cpuinit numa_set_node(int cpu, int node)
 155 {
 156         int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
 157
 158         if (cpu_to_node_map)
 159                 cpu_to_node_map[cpu] = node;
 160
 161         else if (per_cpu_offset(cpu))
 162                 per_cpu(x86_cpu_to_node_map, cpu) = node;
 163
 164         else
 165                 Dprintk(KERN_INFO "Setting node for non-present cpu %d\n", cpu);
 166 }
 167
 168 void __cpuinit numa_clear_node(int cpu)
 169 {
 170         numa_set_node(cpu, NUMA_NO_NODE);
 171 }
 172
 173 void __cpuinit numa_add_cpu(int cpu)
 174 {
 175         cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 176 }
 177
 178 void __cpuinit numa_remove_cpu(int cpu)
 179 {
 180         cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
 181 }
 182 #endif /* CONFIG_NUMA */
 183
 184 #if defined(CONFIG_DEBUG_PER_CPU_MAPS) && defined(CONFIG_X86_64)
 185
 186 int cpu_to_node(int cpu)
 187 {
 188         if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
 189                 printk(KERN_WARNING
 190                         "cpu_to_node(%d): usage too early!\n", cpu);
 191                 dump_stack();
 192                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 193         }
 194         return per_cpu(x86_cpu_to_node_map, cpu);
 195 }
 196 EXPORT_SYMBOL(cpu_to_node);
 197
 198 int early_cpu_to_node(int cpu)
 199 {
 200         if (early_per_cpu_ptr(x86_cpu_to_node_map))
 201                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 202
 203         if (!per_cpu_offset(cpu)) {
 204                 printk(KERN_WARNING
 205                         "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
 206                         dump_stack();
 207                 return NUMA_NO_NODE;
 208         }
 209         return per_cpu(x86_cpu_to_node_map, cpu);
 210 }
 211 #endif