arch/x86/kernel/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 void 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
  79 void 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  */
 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         local_irq_save(flags);
 110         WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
 111         __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 112         local_irq_restore(flags);
 113 }
 114
 115 void default_send_IPI_allbutself(int vector)
 116 {
 117         /*
 118          * if there are no other CPUs in the system then we get an APIC send
 119          * error if we try to broadcast, thus avoid sending IPIs in this case.
 120          */
 121         if (!(num_online_cpus() > 1))
 122                 return;
 123
 124         __default_local_send_IPI_allbutself(vector);
 125 }
 126
 127 void default_send_IPI_all(int vector)
 128 {
 129         __default_local_send_IPI_all(vector);
 130 }
 131
 132 void default_send_IPI_self(int vector)
 133 {
 134         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
 135 }
 136
 137 /* must come after the send_IPI functions above for inlining */
 138 static int convert_apicid_to_cpu(int apic_id)
 139 {
 140         int i;
 141
 142         for_each_possible_cpu(i) {
 143                 if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
 144                         return i;
 145         }
 146         return -1;
 147 }
 148
 149 int safe_smp_processor_id(void)
 150 {
 151         int apicid, cpuid;
 152
 153         if (!boot_cpu_has(X86_FEATURE_APIC))
 154                 return 0;
 155
 156         apicid = hard_smp_processor_id();
 157         if (apicid == BAD_APICID)
 158                 return 0;
 159
 160         cpuid = convert_apicid_to_cpu(apicid);
 161
 162         return cpuid >= 0 ? cpuid : 0;
 163 }
 164 #endif