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         seq_printf(p, "CNT: ");
  57         for_each_online_cpu(j)
  58                 seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
  59         seq_printf(p, "  Performance counter interrupts\n");
  60 #endif
  61 #ifdef CONFIG_SMP
  62         seq_printf(p, "RES: ");
  63         for_each_online_cpu(j)
  64                 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
  65         seq_printf(p, "  Rescheduling interrupts\n");
  66         seq_printf(p, "CAL: ");
  67         for_each_online_cpu(j)
  68                 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
  69         seq_printf(p, "  Function call interrupts\n");
  70         seq_printf(p, "TLB: ");
  71         for_each_online_cpu(j)
  72                 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
  73         seq_printf(p, "  TLB shootdowns\n");
  74 #endif
  75 #ifdef CONFIG_X86_MCE
  76         seq_printf(p, "TRM: ");
  77         for_each_online_cpu(j)
  78                 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
  79         seq_printf(p, "  Thermal event interrupts\n");
  80 # ifdef CONFIG_X86_64
  81         seq_printf(p, "THR: ");
  82         for_each_online_cpu(j)
  83                 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
  84         seq_printf(p, "  Threshold APIC interrupts\n");
  85 # endif
  86 #endif
  87 #ifdef CONFIG_X86_LOCAL_APIC
  88         seq_printf(p, "SPU: ");
  89         for_each_online_cpu(j)
  90                 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
  91         seq_printf(p, "  Spurious interrupts\n");
  92 #endif
  93         seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
  94 #if defined(CONFIG_X86_IO_APIC)
  95         seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
  96 #endif
  97         return 0;
  98 }
  99
 100 int show_interrupts(struct seq_file *p, void *v)
 101 {
 102         unsigned long flags, any_count = 0;
 103         int i = *(loff_t *) v, j;
 104         struct irqaction *action;
 105         struct irq_desc *desc;
 106
 107         if (i > nr_irqs)
 108                 return 0;
 109
 110         if (i == nr_irqs)
 111                 return show_other_interrupts(p);
 112
 113         /* print header */
 114         if (i == 0) {
 115                 seq_printf(p, "           ");
 116                 for_each_online_cpu(j)
 117                         seq_printf(p, "CPU%-8d", j);
 118                 seq_putc(p, '\n');
 119         }
 120
 121         desc = irq_to_desc(i);
 122         if (!desc)
 123                 return 0;
 124
 125         spin_lock_irqsave(&desc->lock, flags);
 126 #ifndef CONFIG_SMP
 127         any_count = kstat_irqs(i);
 128 #else
 129         for_each_online_cpu(j)
 130                 any_count |= kstat_irqs_cpu(i, j);
 131 #endif
 132         action = desc->action;
 133         if (!action && !any_count)
 134                 goto out;
 135
 136         seq_printf(p, "%3d: ", i);
 137 #ifndef CONFIG_SMP
 138         seq_printf(p, "%10u ", kstat_irqs(i));
 139 #else
 140         for_each_online_cpu(j)
 141                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
 142 #endif
 143         seq_printf(p, " %8s", desc->chip->name);
 144         seq_printf(p, "-%-8s", desc->name);
 145
 146         if (action) {
 147                 seq_printf(p, "  %s", action->name);
 148                 while ((action = action->next) != NULL)
 149                         seq_printf(p, ", %s", action->name);
 150         }
 151
 152         seq_putc(p, '\n');
 153 out:
 154         spin_unlock_irqrestore(&desc->lock, flags);
 155         return 0;
 156 }
 157
 158 /*
 159  * /proc/stat helpers
 160  */
 161 u64 arch_irq_stat_cpu(unsigned int cpu)
 162 {
 163         u64 sum = irq_stats(cpu)->__nmi_count;
 164
 165 #ifdef CONFIG_X86_LOCAL_APIC
 166         sum += irq_stats(cpu)->apic_timer_irqs;
 167         sum += irq_stats(cpu)->apic_perf_irqs;
 168 #endif
 169 #ifdef CONFIG_SMP
 170         sum += irq_stats(cpu)->irq_resched_count;
 171         sum += irq_stats(cpu)->irq_call_count;
 172         sum += irq_stats(cpu)->irq_tlb_count;
 173 #endif
 174 #ifdef CONFIG_X86_MCE
 175         sum += irq_stats(cpu)->irq_thermal_count;
 176 # ifdef CONFIG_X86_64
 177         sum += irq_stats(cpu)->irq_threshold_count;
 178 #endif
 179 #endif
 180 #ifdef CONFIG_X86_LOCAL_APIC
 181         sum += irq_stats(cpu)->irq_spurious_count;
 182 #endif
 183         return sum;
 184 }
 185
 186 u64 arch_irq_stat(void)
 187 {
 188         u64 sum = atomic_read(&irq_err_count);
 189
 190 #ifdef CONFIG_X86_IO_APIC
 191         sum += atomic_read(&irq_mis_count);
 192 #endif
 193         return sum;
 194 }
 195
 196 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);