cpumask: alloc zeroed cpumask for static cpumask_var_ts
[linux-2.6/mini2440.git] / arch / x86 / kernel / irq.c
blobc3fe010d74c8e8823793cd9ff816ee02adc8ebde
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>
11 #include <asm/apic.h>
12 #include <asm/io_apic.h>
13 #include <asm/irq.h>
14 #include <asm/idle.h>
16 atomic_t irq_err_count;
18 /* Function pointer for generic interrupt vector handling */
19 void (*generic_interrupt_extension)(void) = NULL;
22 * 'what should we do if we get a hw irq event on an illegal vector'.
23 * each architecture has to answer this themselves.
25 void ack_bad_irq(unsigned int irq)
27 printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
29 #ifdef CONFIG_X86_LOCAL_APIC
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
39 if (cpu_has_apic)
40 ack_APIC_irq();
41 #endif
44 #define irq_stats(x) (&per_cpu(irq_stat, x))
46 * /proc/interrupts printing:
48 static int show_other_interrupts(struct seq_file *p, int prec)
50 int j;
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");
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, "%*s: ", prec, "PLT");
69 for_each_online_cpu(j)
70 seq_printf(p, "%10u ", irq_stats(j)->generic_irqs);
71 seq_printf(p, " Platform interrupts\n");
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;
106 int show_interrupts(struct seq_file *p, void *v)
108 unsigned long flags, any_count = 0;
109 int i = *(loff_t *) v, j, prec;
110 struct irqaction *action;
111 struct irq_desc *desc;
113 if (i > nr_irqs)
114 return 0;
116 for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
117 j *= 10;
119 if (i == nr_irqs)
120 return show_other_interrupts(p, prec);
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');
130 desc = irq_to_desc(i);
131 if (!desc)
132 return 0;
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;
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);
147 if (action) {
148 seq_printf(p, " %s", action->name);
149 while ((action = action->next) != NULL)
150 seq_printf(p, ", %s", action->name);
153 seq_putc(p, '\n');
154 out:
155 spin_unlock_irqrestore(&desc->lock, flags);
156 return 0;
160 * /proc/stat helpers
162 u64 arch_irq_stat_cpu(unsigned int cpu)
164 u64 sum = irq_stats(cpu)->__nmi_count;
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;
186 u64 arch_irq_stat(void)
188 u64 sum = atomic_read(&irq_err_count);
190 #ifdef CONFIG_X86_IO_APIC
191 sum += atomic_read(&irq_mis_count);
192 #endif
193 return sum;
198 * do_IRQ handles all normal device IRQ's (the special
199 * SMP cross-CPU interrupts have their own specific
200 * handlers).
202 unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
204 struct pt_regs *old_regs = set_irq_regs(regs);
206 /* high bit used in ret_from_ code */
207 unsigned vector = ~regs->orig_ax;
208 unsigned irq;
210 exit_idle();
211 irq_enter();
213 irq = __get_cpu_var(vector_irq)[vector];
215 if (!handle_irq(irq, regs)) {
216 #ifdef CONFIG_X86_64
217 if (!disable_apic)
218 ack_APIC_irq();
219 #endif
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);
226 irq_exit();
228 set_irq_regs(old_regs);
229 return 1;
233 * Handler for GENERIC_INTERRUPT_VECTOR.
235 void smp_generic_interrupt(struct pt_regs *regs)
237 struct pt_regs *old_regs = set_irq_regs(regs);
239 ack_APIC_irq();
241 exit_idle();
243 irq_enter();
245 inc_irq_stat(generic_irqs);
247 if (generic_interrupt_extension)
248 generic_interrupt_extension();
250 irq_exit();
252 set_irq_regs(old_regs);
255 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);