err.no Git - linux-2.6/blob - 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 /* map cpu index to node index */
  36 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
  37 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
  38 #endif
  39
  40 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
  41 /*
  42  * Copy data used in early init routines from the initial arrays to the
  43  * per cpu data areas.  These arrays then become expendable and the
  44  * *_early_ptr's are zeroed indicating that the static arrays are gone.
  45  */
  46 static void __init setup_per_cpu_maps(void)
  47 {
  48         int cpu;
  49
  50         for_each_possible_cpu(cpu) {
  51                 per_cpu(x86_cpu_to_apicid, cpu) =
  52                                 early_per_cpu_map(x86_cpu_to_apicid, cpu);
  53                 per_cpu(x86_bios_cpu_apicid, cpu) =
  54                                 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
  55 #ifdef X86_64_NUMA
  56                 per_cpu(x86_cpu_to_node_map, cpu) =
  57                                 early_per_cpu_map(x86_cpu_to_node_map, cpu);
  58 #endif
  59         }
  60
  61         /* indicate the early static arrays will soon be gone */
  62         early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
  63         early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
  64 #ifdef X86_64_NUMA
  65         early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
  66 #endif
  67 }
  68
  69 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
  70 cpumask_t *cpumask_of_cpu_map __read_mostly;
  71 EXPORT_SYMBOL(cpumask_of_cpu_map);
  72
  73 /* requires nr_cpu_ids to be initialized */
  74 static void __init setup_cpumask_of_cpu(void)
  75 {
  76         int i;
  77
  78         /* alloc_bootmem zeroes memory */
  79         cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
  80         for (i = 0; i < nr_cpu_ids; i++)
  81                 cpu_set(i, cpumask_of_cpu_map[i]);
  82 }
  83 #else
  84 static inline void setup_cpumask_of_cpu(void) { }
  85 #endif
  86
  87 #ifdef CONFIG_X86_32
  88 /*
  89  * Great future not-so-futuristic plan: make i386 and x86_64 do it
  90  * the same way
  91  */
  92 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
  93 EXPORT_SYMBOL(__per_cpu_offset);
  94 #endif
  95
  96 /*
  97  * Great future plan:
  98  * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
  99  * Always point %gs to its beginning
 100  */
 101 void __init setup_per_cpu_areas(void)
 102 {
 103         int i, highest_cpu = 0;
 104         unsigned long size;
 105
 106 #ifdef CONFIG_HOTPLUG_CPU
 107         prefill_possible_map();
 108 #endif
 109
 110         /* Copy section for each CPU (we discard the original) */
 111         size = PERCPU_ENOUGH_ROOM;
 112         printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
 113                           size);
 114
 115         for_each_possible_cpu(i) {
 116                 char *ptr;
 117 #ifndef CONFIG_NEED_MULTIPLE_NODES
 118                 ptr = alloc_bootmem_pages(size);
 119 #else
 120                 int node = early_cpu_to_node(i);
 121                 if (!node_online(node) || !NODE_DATA(node)) {
 122                         ptr = alloc_bootmem_pages(size);
 123                         printk(KERN_INFO
 124                                "cpu %d has no node %d or node-local memory\n",
 125                                 i, node);
 126                 }
 127                 else
 128                         ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
 129 #endif
 130                 if (!ptr)
 131                         panic("Cannot allocate cpu data for CPU %d\n", i);
 132 #ifdef CONFIG_X86_64
 133                 cpu_pda(i)->data_offset = ptr - __per_cpu_start;
 134 #else
 135                 __per_cpu_offset[i] = ptr - __per_cpu_start;
 136 #endif
 137                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 138
 139                 highest_cpu = i;
 140         }
 141
 142         nr_cpu_ids = highest_cpu + 1;
 143         printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
 144
 145         /* Setup percpu data maps */
 146         setup_per_cpu_maps();
 147
 148         /* Setup cpumask_of_cpu map */
 149         setup_cpumask_of_cpu();
 150 }
 151
 152 #endif
 153
 154 #ifdef X86_64_NUMA
 155 void __cpuinit numa_set_node(int cpu, int node)
 156 {
 157         int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
 158
 159         if (node != NUMA_NO_NODE)
 160                 cpu_pda(cpu)->nodenumber = node;
 161
 162         if (cpu_to_node_map)
 163                 cpu_to_node_map[cpu] = node;
 164
 165         else if (per_cpu_offset(cpu))
 166                 per_cpu(x86_cpu_to_node_map, cpu) = node;
 167
 168         else
 169                 Dprintk(KERN_INFO "Setting node for non-present cpu %d\n", cpu);
 170 }
 171
 172 void __cpuinit numa_clear_node(int cpu)
 173 {
 174         numa_set_node(cpu, NUMA_NO_NODE);
 175 }
 176
 177 void __cpuinit numa_add_cpu(int cpu)
 178 {
 179         cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 180 }
 181
 182 void __cpuinit numa_remove_cpu(int cpu)
 183 {
 184         cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
 185 }
 186 #endif /* CONFIG_NUMA */
 187
 188 #if defined(CONFIG_DEBUG_PER_CPU_MAPS) && defined(CONFIG_X86_64)
 189
 190 int cpu_to_node(int cpu)
 191 {
 192         if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
 193                 printk(KERN_WARNING
 194                         "cpu_to_node(%d): usage too early!\n", cpu);
 195                 dump_stack();
 196                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 197         }
 198         return per_cpu(x86_cpu_to_node_map, cpu);
 199 }
 200 EXPORT_SYMBOL(cpu_to_node);
 201
 202 int early_cpu_to_node(int cpu)
 203 {
 204         if (early_per_cpu_ptr(x86_cpu_to_node_map))
 205                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 206
 207         if (!per_cpu_offset(cpu)) {
 208                 printk(KERN_WARNING
 209                         "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
 210                         dump_stack();
 211                 return NUMA_NO_NODE;
 212         }
 213         return per_cpu(x86_cpu_to_node_map, cpu);
 214 }
 215 #endif