Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / arch / x86 / kernel / irq.c
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
10 #include <asm/apic.h>
11 #include <asm/io_apic.h>
12 #include <asm/irq.h>
13
14 atomic_t irq_err_count;
15
16 /*
17  * 'what should we do if we get a hw irq event on an illegal vector'.
18  * each architecture has to answer this themselves.
19  */
20 void ack_bad_irq(unsigned int irq)
21 {
22         printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
23
24 #ifdef CONFIG_X86_LOCAL_APIC
25         /*
26          * Currently unexpected vectors happen only on SMP and APIC.
27          * We _must_ ack these because every local APIC has only N
28          * irq slots per priority level, and a 'hanging, unacked' IRQ
29          * holds up an irq slot - in excessive cases (when multiple
30          * unexpected vectors occur) that might lock up the APIC
31          * completely.
32          * But only ack when the APIC is enabled -AK
33          */
34         if (cpu_has_apic)
35                 ack_APIC_irq();
36 #endif
37 }
38
39 #ifdef CONFIG_X86_32
40 # define irq_stats(x)           (&per_cpu(irq_stat, x))
41 #else
42 # define irq_stats(x)           cpu_pda(x)
43 #endif
44 /*
45  * /proc/interrupts printing:
46  */
47 static int show_other_interrupts(struct seq_file *p)
48 {
49         int j;
50
51         seq_printf(p, "NMI: ");
52         for_each_online_cpu(j)
53                 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
54         seq_printf(p, "  Non-maskable interrupts\n");
55 #ifdef CONFIG_X86_LOCAL_APIC
56         seq_printf(p, "LOC: ");
57         for_each_online_cpu(j)
58                 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
59         seq_printf(p, "  Local timer interrupts\n");
60 #endif
61 #ifdef CONFIG_SMP
62         seq_printf(p, "RES: ");
63         for_each_online_cpu(j)
64                 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
65         seq_printf(p, "  Rescheduling interrupts\n");
66         seq_printf(p, "CAL: ");
67         for_each_online_cpu(j)
68                 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
69         seq_printf(p, "  Function call interrupts\n");
70         seq_printf(p, "TLB: ");
71         for_each_online_cpu(j)
72                 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
73         seq_printf(p, "  TLB shootdowns\n");
74 #endif
75 #ifdef CONFIG_X86_MCE
76         seq_printf(p, "TRM: ");
77         for_each_online_cpu(j)
78                 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
79         seq_printf(p, "  Thermal event interrupts\n");
80 # ifdef CONFIG_X86_64
81         seq_printf(p, "THR: ");
82         for_each_online_cpu(j)
83                 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
84         seq_printf(p, "  Threshold APIC interrupts\n");
85 # endif
86 #endif
87 #ifdef CONFIG_X86_LOCAL_APIC
88         seq_printf(p, "SPU: ");
89         for_each_online_cpu(j)
90                 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
91         seq_printf(p, "  Spurious interrupts\n");
92 #endif
93         seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
94 #if defined(CONFIG_X86_IO_APIC)
95         seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
96 #endif
97         return 0;
98 }
99
100 int show_interrupts(struct seq_file *p, void *v)
101 {
102         unsigned long flags, any_count = 0;
103         int i = *(loff_t *) v, j;
104         struct irqaction *action;
105         struct irq_desc *desc;
106
107         if (i > nr_irqs)
108                 return 0;
109
110         if (i == nr_irqs)
111                 return show_other_interrupts(p);
112
113         /* print header */
114         if (i == 0) {
115                 seq_printf(p, "           ");
116                 for_each_online_cpu(j)
117                         seq_printf(p, "CPU%-8d", j);
118                 seq_putc(p, '\n');
119         }
120
121         desc = irq_to_desc(i);
122         if (!desc)
123                 return 0;
124
125         spin_lock_irqsave(&desc->lock, flags);
126 #ifndef CONFIG_SMP
127         any_count = kstat_irqs(i);
128 #else
129         for_each_online_cpu(j)
130                 any_count |= kstat_irqs_cpu(i, j);
131 #endif
132         action = desc->action;
133         if (!action && !any_count)
134                 goto out;
135
136         seq_printf(p, "%3d: ", i);
137 #ifndef CONFIG_SMP
138         seq_printf(p, "%10u ", kstat_irqs(i));
139 #else
140         for_each_online_cpu(j)
141                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
142 #endif
143         seq_printf(p, " %8s", desc->chip->name);
144         seq_printf(p, "-%-8s", desc->name);
145
146         if (action) {
147                 seq_printf(p, "  %s", action->name);
148                 while ((action = action->next) != NULL)
149                         seq_printf(p, ", %s", action->name);
150         }
151
152         seq_putc(p, '\n');
153 out:
154         spin_unlock_irqrestore(&desc->lock, flags);
155         return 0;
156 }
157
158 /*
159  * /proc/stat helpers
160  */
161 u64 arch_irq_stat_cpu(unsigned int cpu)
162 {
163         u64 sum = irq_stats(cpu)->__nmi_count;
164
165 #ifdef CONFIG_X86_LOCAL_APIC
166         sum += irq_stats(cpu)->apic_timer_irqs;
167 #endif
168 #ifdef CONFIG_SMP
169         sum += irq_stats(cpu)->irq_resched_count;
170         sum += irq_stats(cpu)->irq_call_count;
171         sum += irq_stats(cpu)->irq_tlb_count;
172 #endif
173 #ifdef CONFIG_X86_MCE
174         sum += irq_stats(cpu)->irq_thermal_count;
175 # ifdef CONFIG_X86_64
176         sum += irq_stats(cpu)->irq_threshold_count;
177 #endif
178 #endif
179 #ifdef CONFIG_X86_LOCAL_APIC
180         sum += irq_stats(cpu)->irq_spurious_count;
181 #endif
182         return sum;
183 }
184
185 u64 arch_irq_stat(void)
186 {
187         u64 sum = atomic_read(&irq_err_count);
188
189 #ifdef CONFIG_X86_IO_APIC
190         sum += atomic_read(&irq_mis_count);
191 #endif
192         return sum;
193 }
194
195 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);