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 9 #include <asm/apic.h> 10 #include <asm/io_apic.h> 11 #include <asm/smp.h> 12 13 atomic_t irq_err_count; 14 15 /* 16 * 'what should we do if we get a hw irq event on an illegal vector'. 17 * each architecture has to answer this themselves. 18 */ 19 void ack_bad_irq(unsigned int irq) 20 { 21 printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq); 22 23 #ifdef CONFIG_X86_LOCAL_APIC 24 /* 25 * Currently unexpected vectors happen only on SMP and APIC. 26 * We _must_ ack these because every local APIC has only N 27 * irq slots per priority level, and a 'hanging, unacked' IRQ 28 * holds up an irq slot - in excessive cases (when multiple 29 * unexpected vectors occur) that might lock up the APIC 30 * completely. 31 * But only ack when the APIC is enabled -AK 32 */ 33 if (cpu_has_apic) 34 ack_APIC_irq(); 35 #endif 36 } 37 38 #ifdef CONFIG_X86_32 39 # define irq_stats(x) (&per_cpu(irq_stat, x)) 40 #else 41 # define irq_stats(x) cpu_pda(x) 42 #endif 43 /* 44 * /proc/interrupts printing: 45 */ 46 static int show_other_interrupts(struct seq_file *p) 47 { 48 int j; 49 50 seq_printf(p, "NMI: "); 51 for_each_online_cpu(j) 52 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count); 53 seq_printf(p, " Non-maskable interrupts\n"); 54 #ifdef CONFIG_X86_LOCAL_APIC 55 seq_printf(p, "LOC: "); 56 for_each_online_cpu(j) 57 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs); 58 seq_printf(p, " Local timer interrupts\n"); 59 #endif 60 #ifdef CONFIG_SMP 61 seq_printf(p, "RES: "); 62 for_each_online_cpu(j) 63 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count); 64 seq_printf(p, " Rescheduling interrupts\n"); 65 seq_printf(p, "CAL: "); 66 for_each_online_cpu(j) 67 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count); 68 seq_printf(p, " Function call interrupts\n"); 69 seq_printf(p, "TLB: "); 70 for_each_online_cpu(j) 71 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count); 72 seq_printf(p, " TLB shootdowns\n"); 73 #endif 74 #ifdef CONFIG_X86_MCE 75 seq_printf(p, "TRM: "); 76 for_each_online_cpu(j) 77 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count); 78 seq_printf(p, " Thermal event interrupts\n"); 79 # ifdef CONFIG_X86_64 80 seq_printf(p, "THR: "); 81 for_each_online_cpu(j) 82 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count); 83 seq_printf(p, " Threshold APIC interrupts\n"); 84 # endif 85 #endif 86 #ifdef CONFIG_X86_LOCAL_APIC 87 seq_printf(p, "SPU: "); 88 for_each_online_cpu(j) 89 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count); 90 seq_printf(p, " Spurious interrupts\n"); 91 #endif 92 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); 93 #if defined(CONFIG_X86_IO_APIC) 94 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count)); 95 #endif 96 return 0; 97 } 98 99 int show_interrupts(struct seq_file *p, void *v) 100 { 101 unsigned long flags, any_count = 0; 102 int i = *(loff_t *) v, j; 103 struct irqaction *action; 104 struct irq_desc *desc; 105 106 if (i > nr_irqs) 107 return 0; 108 109 if (i == nr_irqs) 110 return show_other_interrupts(p); 111 112 /* print header */ 113 if (i == 0) { 114 seq_printf(p, " "); 115 for_each_online_cpu(j) 116 seq_printf(p, "CPU%-8d", j); 117 seq_putc(p, '\n'); 118 } 119 120 desc = irq_to_desc(i); 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