2 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
4 * This file contains the lowest level x86_64-specific interrupt
5 * entry and irq statistics code. All the remaining irq logic is
6 * done by the generic kernel/irq/ code and in the
7 * x86_64-specific irq controller code. (e.g. i8259.c and
11 #include <linux/kernel_stat.h>
12 #include <linux/interrupt.h>
13 #include <linux/seq_file.h>
14 #include <linux/module.h>
15 #include <linux/delay.h>
16 #include <asm/uaccess.h>
17 #include <asm/io_apic.h>
21 atomic_t irq_err_count;
24 * 'what should we do if we get a hw irq event on an illegal vector'.
25 * each architecture has to answer this themselves.
27 void ack_bad_irq(unsigned int irq)
29 printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
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
37 * But don't ack when the APIC is disabled. -AK
43 #ifdef CONFIG_DEBUG_STACKOVERFLOW
45 * Probabilistic stack overflow check:
47 * Only check the stack in process context, because everything else
48 * runs on the big interrupt stacks. Checking reliably is too expensive,
49 * so we just check from interrupts.
51 static inline void stack_overflow_check(struct pt_regs *regs)
53 u64 curbase = (u64)task_stack_page(current);
54 static unsigned long warned = -60*HZ;
56 if (regs->sp >= curbase && regs->sp <= curbase + THREAD_SIZE &&
57 regs->sp < curbase + sizeof(struct thread_info) + 128 &&
58 time_after(jiffies, warned + 60*HZ)) {
59 printk("do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n",
60 current->comm, curbase, regs->sp);
61 show_stack(NULL,NULL);
68 * Generic, controller-independent functions:
71 int show_interrupts(struct seq_file *p, void *v)
74 struct irqaction * action;
77 struct irq_desc *desc = NULL;
80 entries = nr_irqs - 1;
85 desc = irq_to_desc(i);
89 for_each_online_cpu(j)
90 seq_printf(p, "CPU%-8d",j);
95 unsigned any_count = 0;
97 spin_lock_irqsave(&desc->lock, flags);
99 any_count = kstat_irqs(i);
101 for_each_online_cpu(j)
102 any_count |= kstat_irqs_cpu(i, j);
104 action = desc->action;
105 if (!action && !any_count)
107 seq_printf(p, "%3d: ", i);
109 seq_printf(p, "%10u ", kstat_irqs(i));
111 for_each_online_cpu(j)
112 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
114 seq_printf(p, " %8s", desc->chip->name);
115 seq_printf(p, "-%-8s", desc->name);
118 seq_printf(p, " %s", action->name);
119 while ((action = action->next) != NULL)
120 seq_printf(p, ", %s", action->name);
124 spin_unlock_irqrestore(&desc->lock, flags);
128 seq_printf(p, "NMI: ");
129 for_each_online_cpu(j)
130 seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
131 seq_printf(p, " Non-maskable interrupts\n");
132 seq_printf(p, "LOC: ");
133 for_each_online_cpu(j)
134 seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
135 seq_printf(p, " Local timer interrupts\n");
137 seq_printf(p, "RES: ");
138 for_each_online_cpu(j)
139 seq_printf(p, "%10u ", cpu_pda(j)->irq_resched_count);
140 seq_printf(p, " Rescheduling interrupts\n");
141 seq_printf(p, "CAL: ");
142 for_each_online_cpu(j)
143 seq_printf(p, "%10u ", cpu_pda(j)->irq_call_count);
144 seq_printf(p, " Function call interrupts\n");
145 seq_printf(p, "TLB: ");
146 for_each_online_cpu(j)
147 seq_printf(p, "%10u ", cpu_pda(j)->irq_tlb_count);
148 seq_printf(p, " TLB shootdowns\n");
150 #ifdef CONFIG_X86_MCE
151 seq_printf(p, "TRM: ");
152 for_each_online_cpu(j)
153 seq_printf(p, "%10u ", cpu_pda(j)->irq_thermal_count);
154 seq_printf(p, " Thermal event interrupts\n");
155 seq_printf(p, "THR: ");
156 for_each_online_cpu(j)
157 seq_printf(p, "%10u ", cpu_pda(j)->irq_threshold_count);
158 seq_printf(p, " Threshold APIC interrupts\n");
160 seq_printf(p, "SPU: ");
161 for_each_online_cpu(j)
162 seq_printf(p, "%10u ", cpu_pda(j)->irq_spurious_count);
163 seq_printf(p, " Spurious interrupts\n");
164 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
173 u64 arch_irq_stat_cpu(unsigned int cpu)
175 u64 sum = cpu_pda(cpu)->__nmi_count;
177 sum += cpu_pda(cpu)->apic_timer_irqs;
179 sum += cpu_pda(cpu)->irq_resched_count;
180 sum += cpu_pda(cpu)->irq_call_count;
181 sum += cpu_pda(cpu)->irq_tlb_count;
183 #ifdef CONFIG_X86_MCE
184 sum += cpu_pda(cpu)->irq_thermal_count;
185 sum += cpu_pda(cpu)->irq_threshold_count;
187 sum += cpu_pda(cpu)->irq_spurious_count;
191 u64 arch_irq_stat(void)
193 return atomic_read(&irq_err_count);
197 * do_IRQ handles all normal device IRQ's (the special
198 * SMP cross-CPU interrupts have their own specific
201 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
203 struct pt_regs *old_regs = set_irq_regs(regs);
204 struct irq_desc *desc;
206 /* high bit used in ret_from_ code */
207 unsigned vector = ~regs->orig_ax;
212 irq = __get_cpu_var(vector_irq)[vector];
214 #ifdef CONFIG_DEBUG_STACKOVERFLOW
215 stack_overflow_check(regs);
218 desc = irq_to_desc(irq);
220 generic_handle_irq_desc(irq, desc);
225 if (printk_ratelimit())
226 printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",
227 __func__, smp_processor_id(), vector);
232 set_irq_regs(old_regs);
236 #ifdef CONFIG_HOTPLUG_CPU
237 void fixup_irqs(cpumask_t map)
241 struct irq_desc *desc;
243 for_each_irq_desc(irq, desc) {
245 int break_affinity = 0;
246 int set_affinity = 1;
251 /* interrupt's are disabled at this point */
252 spin_lock(&desc->lock);
254 if (!irq_has_action(irq) ||
255 cpus_equal(desc->affinity, map)) {
256 spin_unlock(&desc->lock);
260 cpus_and(mask, desc->affinity, map);
261 if (cpus_empty(mask)) {
266 if (desc->chip->mask)
267 desc->chip->mask(irq);
269 if (desc->chip->set_affinity)
270 desc->chip->set_affinity(irq, mask);
271 else if (!(warned++))
274 if (desc->chip->unmask)
275 desc->chip->unmask(irq);
277 spin_unlock(&desc->lock);
279 if (break_affinity && set_affinity)
280 printk("Broke affinity for irq %i\n", irq);
281 else if (!set_affinity)
282 printk("Cannot set affinity for irq %i\n", irq);
285 /* That doesn't seem sufficient. Give it 1ms. */
292 extern void call_softirq(void);
294 asmlinkage void do_softirq(void)
302 local_irq_save(flags);
303 pending = local_softirq_pending();
304 /* Switch to interrupt stack */
307 WARN_ON_ONCE(softirq_count());
309 local_irq_restore(flags);