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 #ifdef CONFIG_X86_32 40 # define irq_stats(x) (&per_cpu(irq_stat, x)) 41 #else 42 # define irq_stats(x) cpu_pda(x) 43 #endif 44 /* 45 * /proc/interrupts printing: 46 */ 47 static int show_other_interrupts(struct seq_file *p) 48 { 49 int j; 50 51 seq_printf(p, "NMI: "); 52 for_each_online_cpu(j) 53 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count); 54 seq_printf(p, " Non-maskable interrupts\n"); 55 #ifdef CONFIG_X86_LOCAL_APIC 56 seq_printf(p, "LOC: "); 57 for_each_online_cpu(j) 58 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs); 59 seq_printf(p, " Local timer 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 #endif 168 #ifdef CONFIG_SMP 169 sum += irq_stats(cpu)->irq_resched_count; 170 sum += irq_stats(cpu)->irq_call_count; 171 sum += irq_stats(cpu)->irq_tlb_count; 172 #endif 173 #ifdef CONFIG_X86_MCE 174 sum += irq_stats(cpu)->irq_thermal_count; 175 # ifdef CONFIG_X86_64 176 sum += irq_stats(cpu)->irq_threshold_count; 177 #endif 178 #endif 179 #ifdef CONFIG_X86_LOCAL_APIC 180 sum += irq_stats(cpu)->irq_spurious_count; 181 #endif 182 return sum; 183 } 184 185 u64 arch_irq_stat(void) 186 { 187 u64 sum = atomic_read(&irq_err_count); 188 189 #ifdef CONFIG_X86_IO_APIC 190 sum += atomic_read(&irq_mis_count); 191 #endif 192 return sum; 193 } 194 195 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq); 196