LXR linux/arch/x86/kernel/apic/ipi.c

   1#include <linux/cpumask.h>
   2#include <linux/interrupt.h>
   3
   4#include <linux/mm.h>
   5#include <linux/delay.h>
   6#include <linux/spinlock.h>
   7#include <linux/kernel_stat.h>
   8#include <linux/mc146818rtc.h>
   9#include <linux/cache.h>
  10#include <linux/cpu.h>
  11#include <linux/module.h>
  12
  13#include <asm/smp.h>
  14#include <asm/mtrr.h>
  15#include <asm/tlbflush.h>
  16#include <asm/mmu_context.h>
  17#include <asm/apic.h>
  18#include <asm/proto.h>
  19#include <asm/ipi.h>
  20
  21void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
  22{
  23        unsigned long query_cpu;
  24        unsigned long flags;
  25
  26        /*
  27         * Hack. The clustered APIC addressing mode doesn't allow us to send
  28         * to an arbitrary mask, so I do a unicast to each CPU instead.
  29         * - mbligh
  30         */
  31        local_irq_save(flags);
  32        for_each_cpu(query_cpu, mask) {
  33                __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
  34                                query_cpu), vector, APIC_DEST_PHYSICAL);
  35        }
  36        local_irq_restore(flags);
  37}
  38
  39void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
  40                                                 int vector)
  41{
  42        unsigned int this_cpu = smp_processor_id();
  43        unsigned int query_cpu;
  44        unsigned long flags;
  45
  46        /* See Hack comment above */
  47
  48        local_irq_save(flags);
  49        for_each_cpu(query_cpu, mask) {
  50                if (query_cpu == this_cpu)
  51                        continue;
  52                __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
  53                                 query_cpu), vector, APIC_DEST_PHYSICAL);
  54        }
  55        local_irq_restore(flags);
  56}
  57
  58#ifdef CONFIG_X86_32
  59
  60void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
  61                                                 int vector)
  62{
  63        unsigned long flags;
  64        unsigned int query_cpu;
  65
  66        /*
  67         * Hack. The clustered APIC addressing mode doesn't allow us to send
  68         * to an arbitrary mask, so I do a unicasts to each CPU instead. This
  69         * should be modified to do 1 message per cluster ID - mbligh
  70         */
  71
  72        local_irq_save(flags);
  73        for_each_cpu(query_cpu, mask)
  74                __default_send_IPI_dest_field(
  75                        early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  76                        vector, apic->dest_logical);
  77        local_irq_restore(flags);
  78}
  79
  80void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
  81                                                 int vector)
  82{
  83        unsigned long flags;
  84        unsigned int query_cpu;
  85        unsigned int this_cpu = smp_processor_id();
  86
  87        /* See Hack comment above */
  88
  89        local_irq_save(flags);
  90        for_each_cpu(query_cpu, mask) {
  91                if (query_cpu == this_cpu)
  92                        continue;
  93                __default_send_IPI_dest_field(
  94                        early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  95                        vector, apic->dest_logical);
  96                }
  97        local_irq_restore(flags);
  98}
  99
 100/*
 101 * This is only used on smaller machines.
 102 */
 103void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
 104{
 105        unsigned long mask = cpumask_bits(cpumask)[0];
 106        unsigned long flags;
 107
 108        if (!mask)
 109                return;
 110
 111        local_irq_save(flags);
 112        WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
 113        __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 114        local_irq_restore(flags);
 115}
 116
 117void default_send_IPI_allbutself(int vector)
 118{
 119        /*
 120         * if there are no other CPUs in the system then we get an APIC send
 121         * error if we try to broadcast, thus avoid sending IPIs in this case.
 122         */
 123        if (!(num_online_cpus() > 1))
 124                return;
 125
 126        __default_local_send_IPI_allbutself(vector);
 127}
 128
 129void default_send_IPI_all(int vector)
 130{
 131        __default_local_send_IPI_all(vector);
 132}
 133
 134void default_send_IPI_self(int vector)
 135{
 136        __default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
 137}
 138
 139/* must come after the send_IPI functions above for inlining */
 140static int convert_apicid_to_cpu(int apic_id)
 141{
 142        int i;
 143
 144        for_each_possible_cpu(i) {
 145                if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
 146                        return i;
 147        }
 148        return -1;
 149}
 150
 151int safe_smp_processor_id(void)
 152{
 153        int apicid, cpuid;
 154
 155        if (!cpu_has_apic)
 156                return 0;
 157
 158        apicid = hard_smp_processor_id();
 159        if (apicid == BAD_APICID)
 160                return 0;
 161
 162        cpuid = convert_apicid_to_cpu(apicid);
 163
 164        return cpuid >= 0 ? cpuid : 0;
 165}
 166#endif
 167