summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/irq.c
blob: 3973e2df7f877c3a2fd7868691e3fd55214a178e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * Common interrupt code for 32 and 64 bit
 */
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/smp.h>

#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/irq.h>

atomic_t irq_err_count;

/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves.
 */
void ack_bad_irq(unsigned int irq)
{
	printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);

#ifdef CONFIG_X86_LOCAL_APIC
	/*
	 * Currently unexpected vectors happen only on SMP and APIC.
	 * We _must_ ack these because every local APIC has only N
	 * irq slots per priority level, and a 'hanging, unacked' IRQ
	 * holds up an irq slot - in excessive cases (when multiple
	 * unexpected vectors occur) that might lock up the APIC
	 * completely.
	 * But only ack when the APIC is enabled -AK
	 */
	if (cpu_has_apic)
		ack_APIC_irq();
#endif
}

#ifdef CONFIG_X86_32
# define irq_stats(x)		(&per_cpu(irq_stat, x))
#else
# define irq_stats(x)		cpu_pda(x)
#endif
/*
 * /proc/interrupts printing:
 */
static int show_other_interrupts(struct seq_file *p)
{
	int j;

	seq_printf(p, "NMI: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
	seq_printf(p, "  Non-maskable interrupts\n");
#ifdef CONFIG_X86_LOCAL_APIC
	seq_printf(p, "LOC: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
	seq_printf(p, "  Local timer interrupts\n");
#endif
#ifdef CONFIG_SMP
	seq_printf(p, "RES: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
	seq_printf(p, "  Rescheduling interrupts\n");
	seq_printf(p, "CAL: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
	seq_printf(p, "  Function call interrupts\n");
	seq_printf(p, "TLB: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
	seq_printf(p, "  TLB shootdowns\n");
#endif
#ifdef CONFIG_X86_MCE
	seq_printf(p, "TRM: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
	seq_printf(p, "  Thermal event interrupts\n");
# ifdef CONFIG_X86_64
	seq_printf(p, "THR: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
	seq_printf(p, "  Threshold APIC interrupts\n");
# endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
	seq_printf(p, "SPU: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
	seq_printf(p, "  Spurious interrupts\n");
#endif
	seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
	seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
#endif
	return 0;
}

int show_interrupts(struct seq_file *p, void *v)
{
	unsigned long flags, any_count = 0;
	int i = *(loff_t *) v, j;
	struct irqaction *action;
	struct irq_desc *desc;

	if (i > nr_irqs)
		return 0;

	if (i == nr_irqs)
		return show_other_interrupts(p);

	/* print header */
	if (i == 0) {
		seq_printf(p, "           ");
		for_each_online_cpu(j)
			seq_printf(p, "CPU%-8d", j);
		seq_putc(p, '\n');
	}

	desc = irq_to_desc(i);
	if (!desc)
		return 0;

	spin_lock_irqsave(&desc->lock, flags);
#ifndef CONFIG_SMP
	any_count = kstat_irqs(i);
#else
	for_each_online_cpu(j)
		any_count |= kstat_irqs_cpu(i, j);
#endif
	action = desc->action;
	if (!action && !any_count)
		goto out;

	seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
	seq_printf(p, "%10u ", kstat_irqs(i));
#else
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
#endif
	seq_printf(p, " %8s", desc->chip->name);
	seq_printf(p, "-%-8s", desc->name);

	if (action) {
		seq_printf(p, "  %s", action->name);
		while ((action = action->next) != NULL)
			seq_printf(p, ", %s", action->name);
	}

	seq_putc(p, '\n');
out:
	spin_unlock_irqrestore(&desc->lock, flags);
	return 0;
}

/*
 * /proc/stat helpers
 */
u64 arch_irq_stat_cpu(unsigned int cpu)
{
	u64 sum = irq_stats(cpu)->__nmi_count;

#ifdef CONFIG_X86_LOCAL_APIC
	sum += irq_stats(cpu)->apic_timer_irqs;
#endif
#ifdef CONFIG_SMP
	sum += irq_stats(cpu)->irq_resched_count;
	sum += irq_stats(cpu)->irq_call_count;
	sum += irq_stats(cpu)->irq_tlb_count;
#endif
#ifdef CONFIG_X86_MCE
	sum += irq_stats(cpu)->irq_thermal_count;
# ifdef CONFIG_X86_64
	sum += irq_stats(cpu)->irq_threshold_count;
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
	sum += irq_stats(cpu)->irq_spurious_count;
#endif
	return sum;
}

u64 arch_irq_stat(void)
{
	u64 sum = atomic_read(&irq_err_count);

#ifdef CONFIG_X86_IO_APIC
	sum += atomic_read(&irq_mis_count);
#endif
	return sum;
}

EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);
OpenPOWER on IntegriCloud