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 #include <linux/ftrace.h> 10 11 #include <asm/apic.h> 12 #include <asm/io_apic.h> 13 #include <asm/irq.h> 14 #include <asm/idle.h> 15 16 atomic_t irq_err_count; 17 18 /* Function pointer for generic interrupt vector handling */ 19 void (*generic_interrupt_extension)(void) = NULL; 20 21 /* 22 * 'what should we do if we get a hw irq event on an illegal vector'. 23 * each architecture has to answer this themselves. 24 */ 25 void ack_bad_irq(unsigned int irq) 26 { 27 printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq); 28 29 #ifdef CONFIG_X86_LOCAL_APIC 30 /* 31 * Currently unexpected vectors happen only on SMP and APIC. 32 * We _must_ ack these because every local APIC has only N 33 * irq slots per priority level, and a 'hanging, unacked' IRQ 34 * holds up an irq slot - in excessive cases (when multiple 35 * unexpected vectors occur) that might lock up the APIC 36 * completely. 37 * But only ack when the APIC is enabled -AK 38 */ 39 if (cpu_has_apic) 40 ack_APIC_irq(); 41 #endif 42 } 43 44 #define irq_stats(x) (&per_cpu(irq_stat, x)) 45 /* 46 * /proc/interrupts printing: 47 */ 48 static int show_other_interrupts(struct seq_file *p, int prec) 49 { 50 int j; 51 52 seq_printf(p, "%*s: ", prec, "NMI"); 53 for_each_online_cpu(j) 54 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count); 55 seq_printf(p, " Non-maskable interrupts\n"); 56 #ifdef CONFIG_X86_LOCAL_APIC 57 seq_printf(p, "%*s: ", prec, "LOC"); 58 for_each_online_cpu(j) 59 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs); 60 seq_printf(p, " Local timer interrupts\n"); 61 62 seq_printf(p, "%*s: ", prec, "SPU"); 63 for_each_online_cpu(j) 64 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count); 65 seq_printf(p, " Spurious interrupts\n"); 66 #endif 67 if (generic_interrupt_extension) { 68 seq_printf(p, "PLT: "); 69 for_each_online_cpu(j) 70 seq_printf(p, "%10u ", irq_stats(j)->generic_irqs); 71 seq_printf(p, " Platform interrupts\n"); 72 } 73 #ifdef CONFIG_SMP 74 seq_printf(p, "%*s: ", prec, "RES"); 75 for_each_online_cpu(j) 76 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count); 77 seq_printf(p, " Rescheduling interrupts\n"); 78 seq_printf(p, "%*s: ", prec, "CAL"); 79 for_each_online_cpu(j) 80 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count); 81 seq_printf(p, " Function call interrupts\n"); 82 seq_printf(p, "%*s: ", prec, "TLB"); 83 for_each_online_cpu(j) 84 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count); 85 seq_printf(p, " TLB shootdowns\n"); 86 #endif 87 #ifdef CONFIG_X86_MCE 88 seq_printf(p, "%*s: ", prec, "TRM"); 89 for_each_online_cpu(j) 90 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count); 91 seq_printf(p, " Thermal event interrupts\n"); 92 # ifdef CONFIG_X86_64 93 seq_printf(p, "%*s: ", prec, "THR"); 94 for_each_online_cpu(j) 95 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count); 96 seq_printf(p, " Threshold APIC interrupts\n"); 97 # endif 98 #endif 99 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); 100 #if defined(CONFIG_X86_IO_APIC) 101 seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count)); 102 #endif 103 return 0; 104 } 105 106 int show_interrupts(struct seq_file *p, void *v) 107 { 108 unsigned long flags, any_count = 0; 109 int i = *(loff_t *) v, j, prec; 110 struct irqaction *action; 111 struct irq_desc *desc; 112 113 if (i > nr_irqs) 114 return 0; 115 116 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) 117 j *= 10; 118 119 if (i == nr_irqs) 120 return show_other_interrupts(p, prec); 121 122 /* print header */ 123 if (i == 0) { 124 seq_printf(p, "%*s", prec + 8, ""); 125 for_each_online_cpu(j) 126 seq_printf(p, "CPU%-8d", j); 127 seq_putc(p, '\n'); 128 } 129 130 desc = irq_to_desc(i); 131 if (!desc) 132 return 0; 133 134 spin_lock_irqsave(&desc->lock, flags); 135 for_each_online_cpu(j) 136 any_count |= kstat_irqs_cpu(i, j); 137 action = desc->action; 138 if (!action && !any_count) 139 goto out; 140 141 seq_printf(p, "%*d: ", prec, i); 142 for_each_online_cpu(j) 143 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); 144 seq_printf(p, " %8s", desc->chip->name); 145 seq_printf(p, "-%-8s", desc->name); 146 147 if (action) { 148 seq_printf(p, " %s", action->name); 149 while ((action = action->next) != NULL) 150 seq_printf(p, ", %s", action->name); 151 } 152 153 seq_putc(p, '\n'); 154 out: 155 spin_unlock_irqrestore(&desc->lock, flags); 156 return 0; 157 } 158 159 /* 160 * /proc/stat helpers 161 */ 162 u64 arch_irq_stat_cpu(unsigned int cpu) 163 { 164 u64 sum = irq_stats(cpu)->__nmi_count; 165 166 #ifdef CONFIG_X86_LOCAL_APIC 167 sum += irq_stats(cpu)->apic_timer_irqs; 168 sum += irq_stats(cpu)->irq_spurious_count; 169 #endif 170 if (generic_interrupt_extension) 171 sum += irq_stats(cpu)->generic_irqs; 172 #ifdef CONFIG_SMP 173 sum += irq_stats(cpu)->irq_resched_count; 174 sum += irq_stats(cpu)->irq_call_count; 175 sum += irq_stats(cpu)->irq_tlb_count; 176 #endif 177 #ifdef CONFIG_X86_MCE 178 sum += irq_stats(cpu)->irq_thermal_count; 179 # ifdef CONFIG_X86_64 180 sum += irq_stats(cpu)->irq_threshold_count; 181 #endif 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 } 195 196 197 /* 198 * do_IRQ handles all normal device IRQ's (the special 199 * SMP cross-CPU interrupts have their own specific 200 * handlers). 201 */ 202 unsigned int __irq_entry do_IRQ(struct pt_regs *regs) 203 { 204 struct pt_regs *old_regs = set_irq_regs(regs); 205 206 /* high bit used in ret_from_ code */ 207 unsigned vector = ~regs->orig_ax; 208 unsigned irq; 209 210 exit_idle(); 211 irq_enter(); 212 213 irq = __get_cpu_var(vector_irq)[vector]; 214 215 if (!handle_irq(irq, regs)) { 216 #ifdef CONFIG_X86_64 217 if (!disable_apic) 218 ack_APIC_irq(); 219 #endif 220 221 if (printk_ratelimit()) 222 printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n", 223 __func__, smp_processor_id(), vector, irq); 224 } 225 226 irq_exit(); 227 228 set_irq_regs(old_regs); 229 return 1; 230 } 231 232 /* 233 * Handler for GENERIC_INTERRUPT_VECTOR. 234 */ 235 void smp_generic_interrupt(struct pt_regs *regs) 236 { 237 struct pt_regs *old_regs = set_irq_regs(regs); 238 239 ack_APIC_irq(); 240 241 exit_idle(); 242 243 irq_enter(); 244 245 inc_irq_stat(generic_irqs); 246 247 if (generic_interrupt_extension) 248 generic_interrupt_extension(); 249 250 irq_exit(); 251 252 set_irq_regs(old_regs); 253 } 254 255 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq); 256