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
  22 void 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
  40 void 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
  59 #ifdef CONFIG_X86_32
  60
  61 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
  62                                                  int vector)
  63 {
  64         unsigned long flags;
  65         unsigned int query_cpu;
  66
  67         /*
  68          * Hack. The clustered APIC addressing mode doesn't allow us to send
  69          * to an arbitrary mask, so I do a unicasts to each CPU instead. This
  70          * should be modified to do 1 message per cluster ID - mbligh
  71          */
  72
  73         local_irq_save(flags);
  74         for_each_cpu(query_cpu, mask)
  75                 __default_send_IPI_dest_field(
  76                         early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  77                         vector, apic->dest_logical);
  78         local_irq_restore(flags);
  79 }
  80
  81 void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
  82                                                  int vector)
  83 {
  84         unsigned long flags;
  85         unsigned int query_cpu;
  86         unsigned int this_cpu = smp_processor_id();
  87
  88         /* See Hack comment above */
  89
  90         local_irq_save(flags);
  91         for_each_cpu(query_cpu, mask) {
  92                 if (query_cpu == this_cpu)
  93                         continue;
  94                 __default_send_IPI_dest_field(
  95                         early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  96                         vector, apic->dest_logical);
  97                 }
  98         local_irq_restore(flags);
  99 }
 100
 101 /*
 102  * This is only used on smaller machines.
 103  */
 104 void 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
 118 void 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
 130 void default_send_IPI_all(int vector)
 131 {
 132         __default_local_send_IPI_all(vector);
 133 }
 134
 135 void 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 */
 141 static 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
 152 int 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