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
  21 void 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
  39 void 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
  60 void 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
  80 void 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  */
 103 void 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
 117 void 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
 129 void default_send_IPI_all(int vector)
 130 {
 131         __default_local_send_IPI_all(vector);
 132 }
 133
 134 void 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 */
 140 static 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
 151 int 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