arch/x86/kernel/irq.c

   1 /*
   2  * Common interrupt code for 32 and 64 bit
   3  */
   4 #include <linux/cpu.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/kernel_stat.h>
   7 #include <linux/seq_file.h>
   8 #include <linux/smp.h>
   9
  10 #include <asm/apic.h>
  11 #include <asm/io_apic.h>
  12 #include <asm/irq.h>
  13
  14 atomic_t irq_err_count;
  15
  16 /*
  17  * 'what should we do if we get a hw irq event on an illegal vector'.
  18  * each architecture has to answer this themselves.
  19  */
  20 void ack_bad_irq(unsigned int irq)
  21 {
  22         printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
  23
  24 #ifdef CONFIG_X86_LOCAL_APIC
  25         /*
  26          * Currently unexpected vectors happen only on SMP and APIC.
  27          * We _must_ ack these because every local APIC has only N
  28          * irq slots per priority level, and a 'hanging, unacked' IRQ
  29          * holds up an irq slot - in excessive cases (when multiple
  30          * unexpected vectors occur) that might lock up the APIC
  31          * completely.
  32          * But only ack when the APIC is enabled -AK
  33          */
  34         if (cpu_has_apic)
  35                 ack_APIC_irq();
  36 #endif
  37 }
  38
  39 #define irq_stats(x)            (&per_cpu(irq_stat, x))
  40 /*
  41  * /proc/interrupts printing:
  42  */
  43 static int show_other_interrupts(struct seq_file *p)
  44 {
  45         int j;
  46
  47         seq_printf(p, "NMI: ");
  48         for_each_online_cpu(j)
  49                 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
  50         seq_printf(p, "  Non-maskable interrupts\n");
  51 #ifdef CONFIG_X86_LOCAL_APIC
  52         seq_printf(p, "LOC: ");
  53         for_each_online_cpu(j)
  54                 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
  55         seq_printf(p, "  Local timer interrupts\n");
  56 #endif
  57 #ifdef CONFIG_SMP
  58         seq_printf(p, "RES: ");
  59         for_each_online_cpu(j)
  60                 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
  61         seq_printf(p, "  Rescheduling interrupts\n");
  62         seq_printf(p, "CAL: ");
  63         for_each_online_cpu(j)
  64                 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
  65         seq_printf(p, "  Function call interrupts\n");
  66         seq_printf(p, "TLB: ");
  67         for_each_online_cpu(j)
  68                 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
  69         seq_printf(p, "  TLB shootdowns\n");
  70 #endif
  71 #ifdef CONFIG_X86_MCE
  72         seq_printf(p, "TRM: ");
  73         for_each_online_cpu(j)
  74                 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
  75         seq_printf(p, "  Thermal event interrupts\n");
  76 # ifdef CONFIG_X86_64
  77         seq_printf(p, "THR: ");
  78         for_each_online_cpu(j)
  79                 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
  80         seq_printf(p, "  Threshold APIC interrupts\n");
  81 # endif
  82 #endif
  83 #ifdef CONFIG_X86_LOCAL_APIC
  84         seq_printf(p, "SPU: ");
  85         for_each_online_cpu(j)
  86                 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
  87         seq_printf(p, "  Spurious interrupts\n");
  88 #endif
  89         seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
  90 #if defined(CONFIG_X86_IO_APIC)
  91         seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
  92 #endif
  93         return 0;
  94 }
  95
  96 int show_interrupts(struct seq_file *p, void *v)
  97 {
  98         unsigned long flags, any_count = 0;
  99         int i = *(loff_t *) v, j;
 100         struct irqaction *action;
 101         struct irq_desc *desc;
 102
 103         if (i > nr_irqs)
 104                 return 0;
 105
 106         if (i == nr_irqs)
 107                 return show_other_interrupts(p);
 108
 109         /* print header */
 110         if (i == 0) {
 111                 seq_printf(p, "           ");
 112                 for_each_online_cpu(j)
 113                         seq_printf(p, "CPU%-8d", j);
 114                 seq_putc(p, '\n');
 115         }
 116
 117         desc = irq_to_desc(i);
 118         if (!desc)
 119                 return 0;
 120
 121         spin_lock_irqsave(&desc->lock, flags);
 122 #ifndef CONFIG_SMP
 123         any_count = kstat_irqs(i);
 124 #else
 125         for_each_online_cpu(j)
 126                 any_count |= kstat_irqs_cpu(i, j);
 127 #endif
 128         action = desc->action;
 129         if (!action && !any_count)
 130                 goto out;
 131
 132         seq_printf(p, "%3d: ", i);
 133 #ifndef CONFIG_SMP
 134         seq_printf(p, "%10u ", kstat_irqs(i));
 135 #else
 136         for_each_online_cpu(j)
 137                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
 138 #endif
 139         seq_printf(p, " %8s", desc->chip->name);
 140         seq_printf(p, "-%-8s", desc->name);
 141
 142         if (action) {
 143                 seq_printf(p, "  %s", action->name);
 144                 while ((action = action->next) != NULL)
 145                         seq_printf(p, ", %s", action->name);
 146         }
 147
 148         seq_putc(p, '\n');
 149 out:
 150         spin_unlock_irqrestore(&desc->lock, flags);
 151         return 0;
 152 }
 153
 154 /*
 155  * /proc/stat helpers
 156  */
 157 u64 arch_irq_stat_cpu(unsigned int cpu)
 158 {
 159         u64 sum = irq_stats(cpu)->__nmi_count;
 160
 161 #ifdef CONFIG_X86_LOCAL_APIC
 162         sum += irq_stats(cpu)->apic_timer_irqs;
 163 #endif
 164 #ifdef CONFIG_SMP
 165         sum += irq_stats(cpu)->irq_resched_count;
 166         sum += irq_stats(cpu)->irq_call_count;
 167         sum += irq_stats(cpu)->irq_tlb_count;
 168 #endif
 169 #ifdef CONFIG_X86_MCE
 170         sum += irq_stats(cpu)->irq_thermal_count;
 171 # ifdef CONFIG_X86_64
 172         sum += irq_stats(cpu)->irq_threshold_count;
 173 #endif
 174 #endif
 175 #ifdef CONFIG_X86_LOCAL_APIC
 176         sum += irq_stats(cpu)->irq_spurious_count;
 177 #endif
 178         return sum;
 179 }
 180
 181 u64 arch_irq_stat(void)
 182 {
 183         u64 sum = atomic_read(&irq_err_count);
 184
 185 #ifdef CONFIG_X86_IO_APIC
 186         sum += atomic_read(&irq_mis_count);
 187 #endif
 188         return sum;
 189 }
 190
 191 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);