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

   1#include <linux/cpumask.h>
   2#include <linux/interrupt.h>
   3#include <linux/init.h>
   4
   5#include <linux/mm.h>
   6#include <linux/delay.h>
   7#include <linux/spinlock.h>
   8#include <linux/kernel_stat.h>
   9#include <linux/mc146818rtc.h>
  10#include <linux/cache.h>
  11#include <linux/cpu.h>
  12#include <linux/module.h>
  13
  14#include <asm/smp.h>
  15#include <asm/mtrr.h>
  16#include <asm/tlbflush.h>
  17#include <asm/mmu_context.h>
  18#include <asm/apic.h>
  19#include <asm/proto.h>
  20#include <asm/ipi.h>
  21
  22void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
  23{
  24        unsigned long query_cpu;
  25        unsigned long flags;
  26
  27        /*
  28         * Hack. The clustered APIC addressing mode doesn't allow us to send
  29         * to an arbitrary mask, so I do a unicast to each CPU instead.
  30         * - mbligh
  31         */
  32        local_irq_save(flags);
  33        for_each_cpu(query_cpu, mask) {
  34                __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
  35                                query_cpu), vector, APIC_DEST_PHYSICAL);
  36        }
  37        local_irq_restore(flags);
  38}
  39
  40void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
  41                                                 int vector)
  42{
  43        unsigned int this_cpu = smp_processor_id();
  44        unsigned int query_cpu;
  45        unsigned long flags;
  46
  47        /* See Hack comment above */
  48
  49        local_irq_save(flags);
  50        for_each_cpu(query_cpu, mask) {
  51                if (query_cpu == this_cpu)
  52                        continue;
  53                __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
  54                                 query_cpu), vector, APIC_DEST_PHYSICAL);
  55        }
  56        local_irq_restore(flags);
  57}
  58
  59void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
  60                                                 int vector)
  61{
  62        unsigned long flags;
  63        unsigned int query_cpu;
  64
  65        /*
  66         * Hack. The clustered APIC addressing mode doesn't allow us to send
  67         * to an arbitrary mask, so I do a unicasts to each CPU instead. This
  68         * should be modified to do 1 message per cluster ID - mbligh
  69         */
  70
  71        local_irq_save(flags);
  72        for_each_cpu(query_cpu, mask)
  73                __default_send_IPI_dest_field(
  74                        apic->cpu_to_logical_apicid(query_cpu), vector,
  75                        apic->dest_logical);
  76        local_irq_restore(flags);
  77}
  78
  79void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
  80                                                 int vector)
  81{
  82        unsigned long flags;
  83        unsigned int query_cpu;
  84        unsigned int this_cpu = smp_processor_id();
  85
  86        /* See Hack comment above */
  87
  88        local_irq_save(flags);
  89        for_each_cpu(query_cpu, mask) {
  90                if (query_cpu == this_cpu)
  91                        continue;
  92                __default_send_IPI_dest_field(
  93                        apic->cpu_to_logical_apicid(query_cpu), vector,
  94                        apic->dest_logical);
  95                }
  96        local_irq_restore(flags);
  97}
  98
  99#ifdef CONFIG_X86_32
 100
 101/*
 102 * This is only used on smaller machines.
 103 */
 104void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
 105{
 106        unsigned long mask = cpumask_bits(cpumask)[0];
 107        unsigned long flags;
 108
 109        if (WARN_ONCE(!mask, "empty IPI mask"))
 110                return;
 111
 112        local_irq_save(flags);
 113        WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
 114        __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 115        local_irq_restore(flags);
 116}
 117
 118void default_send_IPI_allbutself(int vector)
 119{
 120        /*
 121         * if there are no other CPUs in the system then we get an APIC send
 122         * error if we try to broadcast, thus avoid sending IPIs in this case.
 123         */
 124        if (!(num_online_cpus() > 1))
 125                return;
 126
 127        __default_local_send_IPI_allbutself(vector);
 128}
 129
 130void default_send_IPI_all(int vector)
 131{
 132        __default_local_send_IPI_all(vector);
 133}
 134
 135void default_send_IPI_self(int vector)
 136{
 137        __default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
 138}
 139
 140/* must come after the send_IPI functions above for inlining */
 141static int convert_apicid_to_cpu(int apic_id)
 142{
 143        int i;
 144
 145        for_each_possible_cpu(i) {
 146                if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
 147                        return i;
 148        }
 149        return -1;
 150}
 151
 152int safe_smp_processor_id(void)
 153{
 154        int apicid, cpuid;
 155
 156        if (!cpu_has_apic)
 157                return 0;
 158
 159        apicid = hard_smp_processor_id();
 160        if (apicid == BAD_APICID)
 161                return 0;
 162
 163        cpuid = convert_apicid_to_cpu(apicid);
 164
 165        return cpuid >= 0 ? cpuid : 0;
 166}
 167#endif
 168