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
;
80 #ifdef CONFIG_HAVE_SPARSE_IRQ
81 desc
= (struct irq_desc
*)v
;
87 entries
= nr_irqs
- 1;
92 desc
= irq_to_desc(i
);
97 for_each_online_cpu(j
)
98 seq_printf(p
, "CPU%-8d",j
);
103 unsigned any_count
= 0;
105 spin_lock_irqsave(&desc
->lock
, flags
);
107 any_count
= kstat_irqs(i
);
109 for_each_online_cpu(j
)
110 any_count
|= kstat_irqs_cpu(i
, j
);
112 action
= desc
->action
;
113 if (!action
&& !any_count
)
115 seq_printf(p
, "%3d: ",i
);
117 seq_printf(p
, "%10u ", kstat_irqs(i
));
119 for_each_online_cpu(j
)
120 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
122 seq_printf(p
, " %8s", desc
->chip
->name
);
123 seq_printf(p
, "-%-8s", desc
->name
);
126 seq_printf(p
, " %s", action
->name
);
127 while ((action
= action
->next
) != NULL
)
128 seq_printf(p
, ", %s", action
->name
);
132 spin_unlock_irqrestore(&desc
->lock
, flags
);
136 seq_printf(p
, "NMI: ");
137 for_each_online_cpu(j
)
138 seq_printf(p
, "%10u ", cpu_pda(j
)->__nmi_count
);
139 seq_printf(p
, " Non-maskable interrupts\n");
140 seq_printf(p
, "LOC: ");
141 for_each_online_cpu(j
)
142 seq_printf(p
, "%10u ", cpu_pda(j
)->apic_timer_irqs
);
143 seq_printf(p
, " Local timer interrupts\n");
145 seq_printf(p
, "RES: ");
146 for_each_online_cpu(j
)
147 seq_printf(p
, "%10u ", cpu_pda(j
)->irq_resched_count
);
148 seq_printf(p
, " Rescheduling interrupts\n");
149 seq_printf(p
, "CAL: ");
150 for_each_online_cpu(j
)
151 seq_printf(p
, "%10u ", cpu_pda(j
)->irq_call_count
);
152 seq_printf(p
, " Function call interrupts\n");
153 seq_printf(p
, "TLB: ");
154 for_each_online_cpu(j
)
155 seq_printf(p
, "%10u ", cpu_pda(j
)->irq_tlb_count
);
156 seq_printf(p
, " TLB shootdowns\n");
158 #ifdef CONFIG_X86_MCE
159 seq_printf(p
, "TRM: ");
160 for_each_online_cpu(j
)
161 seq_printf(p
, "%10u ", cpu_pda(j
)->irq_thermal_count
);
162 seq_printf(p
, " Thermal event interrupts\n");
163 seq_printf(p
, "THR: ");
164 for_each_online_cpu(j
)
165 seq_printf(p
, "%10u ", cpu_pda(j
)->irq_threshold_count
);
166 seq_printf(p
, " Threshold APIC interrupts\n");
168 seq_printf(p
, "SPU: ");
169 for_each_online_cpu(j
)
170 seq_printf(p
, "%10u ", cpu_pda(j
)->irq_spurious_count
);
171 seq_printf(p
, " Spurious interrupts\n");
172 seq_printf(p
, "ERR: %10u\n", atomic_read(&irq_err_count
));
181 u64
arch_irq_stat_cpu(unsigned int cpu
)
183 u64 sum
= cpu_pda(cpu
)->__nmi_count
;
185 sum
+= cpu_pda(cpu
)->apic_timer_irqs
;
187 sum
+= cpu_pda(cpu
)->irq_resched_count
;
188 sum
+= cpu_pda(cpu
)->irq_call_count
;
189 sum
+= cpu_pda(cpu
)->irq_tlb_count
;
191 #ifdef CONFIG_X86_MCE
192 sum
+= cpu_pda(cpu
)->irq_thermal_count
;
193 sum
+= cpu_pda(cpu
)->irq_threshold_count
;
195 sum
+= cpu_pda(cpu
)->irq_spurious_count
;
199 u64
arch_irq_stat(void)
201 return atomic_read(&irq_err_count
);
205 * do_IRQ handles all normal device IRQ's (the special
206 * SMP cross-CPU interrupts have their own specific
209 asmlinkage
unsigned int do_IRQ(struct pt_regs
*regs
)
211 struct pt_regs
*old_regs
= set_irq_regs(regs
);
212 struct irq_desc
*desc
;
214 /* high bit used in ret_from_ code */
215 unsigned vector
= ~regs
->orig_ax
;
220 irq
= __get_cpu_var(vector_irq
)[vector
];
222 #ifdef CONFIG_DEBUG_STACKOVERFLOW
223 stack_overflow_check(regs
);
226 desc
= irq_to_desc(irq
);
228 generic_handle_irq_desc(irq
, desc
);
233 if (printk_ratelimit())
234 printk(KERN_EMERG
"%s: %d.%d No irq handler for vector\n",
235 __func__
, smp_processor_id(), vector
);
240 set_irq_regs(old_regs
);
244 #ifdef CONFIG_HOTPLUG_CPU
245 void fixup_irqs(cpumask_t map
)
249 struct irq_desc
*desc
;
251 for_each_irq_desc(irq
, desc
) {
253 int break_affinity
= 0;
254 int set_affinity
= 1;
259 /* interrupt's are disabled at this point */
260 spin_lock(&desc
->lock
);
262 if (!irq_has_action(irq
) ||
263 cpus_equal(desc
->affinity
, map
)) {
264 spin_unlock(&desc
->lock
);
268 cpus_and(mask
, desc
->affinity
, map
);
269 if (cpus_empty(mask
)) {
274 if (desc
->chip
->mask
)
275 desc
->chip
->mask(irq
);
277 if (desc
->chip
->set_affinity
)
278 desc
->chip
->set_affinity(irq
, mask
);
279 else if (!(warned
++))
282 if (desc
->chip
->unmask
)
283 desc
->chip
->unmask(irq
);
285 spin_unlock(&desc
->lock
);
287 if (break_affinity
&& set_affinity
)
288 printk("Broke affinity for irq %i\n", irq
);
289 else if (!set_affinity
)
290 printk("Cannot set affinity for irq %i\n", irq
);
293 /* That doesn't seem sufficient. Give it 1ms. */
300 extern void call_softirq(void);
302 asmlinkage
void do_softirq(void)
310 local_irq_save(flags
);
311 pending
= local_softirq_pending();
312 /* Switch to interrupt stack */
315 WARN_ON_ONCE(softirq_count());
317 local_irq_restore(flags
);
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