Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
[linux-2.6.git] / 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 #include <linux/ftrace.h>
10
11 #include <asm/apic.h>
12 #include <asm/io_apic.h>
13 #include <asm/irq.h>
14 #include <asm/idle.h>
15 #include <asm/mce.h>
16 #include <asm/hw_irq.h>
17
18 atomic_t irq_err_count;
19
20 /* Function pointer for generic interrupt vector handling */
21 void (*generic_interrupt_extension)(void) = NULL;
22
23 /*
24  * 'what should we do if we get a hw irq event on an illegal vector'.
25  * each architecture has to answer this themselves.
26  */
27 void ack_bad_irq(unsigned int irq)
28 {
29         if (printk_ratelimit())
30                 pr_err("unexpected IRQ trap at vector %02x\n", irq);
31
32         /*
33          * Currently unexpected vectors happen only on SMP and APIC.
34          * We _must_ ack these because every local APIC has only N
35          * irq slots per priority level, and a 'hanging, unacked' IRQ
36          * holds up an irq slot - in excessive cases (when multiple
37          * unexpected vectors occur) that might lock up the APIC
38          * completely.
39          * But only ack when the APIC is enabled -AK
40          */
41         ack_APIC_irq();
42 }
43
44 #define irq_stats(x)            (&per_cpu(irq_stat, x))
45 /*
46  * /proc/interrupts printing:
47  */
48 static int show_other_interrupts(struct seq_file *p, int prec)
49 {
50         int j;
51
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");
61
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         seq_printf(p, "%*s: ", prec, "PMI");
67         for_each_online_cpu(j)
68                 seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
69         seq_printf(p, "  Performance monitoring interrupts\n");
70         seq_printf(p, "%*s: ", prec, "PND");
71         for_each_online_cpu(j)
72                 seq_printf(p, "%10u ", irq_stats(j)->apic_pending_irqs);
73         seq_printf(p, "  Performance pending work\n");
74 #endif
75         if (generic_interrupt_extension) {
76                 seq_printf(p, "%*s: ", prec, "PLT");
77                 for_each_online_cpu(j)
78                         seq_printf(p, "%10u ", irq_stats(j)->generic_irqs);
79                 seq_printf(p, "  Platform interrupts\n");
80         }
81 #ifdef CONFIG_SMP
82         seq_printf(p, "%*s: ", prec, "RES");
83         for_each_online_cpu(j)
84                 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
85         seq_printf(p, "  Rescheduling interrupts\n");
86         seq_printf(p, "%*s: ", prec, "CAL");
87         for_each_online_cpu(j)
88                 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
89         seq_printf(p, "  Function call interrupts\n");
90         seq_printf(p, "%*s: ", prec, "TLB");
91         for_each_online_cpu(j)
92                 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
93         seq_printf(p, "  TLB shootdowns\n");
94 #endif
95 #ifdef CONFIG_X86_MCE
96         seq_printf(p, "%*s: ", prec, "TRM");
97         for_each_online_cpu(j)
98                 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
99         seq_printf(p, "  Thermal event interrupts\n");
100 # ifdef CONFIG_X86_MCE_THRESHOLD
101         seq_printf(p, "%*s: ", prec, "THR");
102         for_each_online_cpu(j)
103                 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
104         seq_printf(p, "  Threshold APIC interrupts\n");
105 # endif
106 #endif
107 #ifdef CONFIG_X86_MCE
108         seq_printf(p, "%*s: ", prec, "MCE");
109         for_each_online_cpu(j)
110                 seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
111         seq_printf(p, "  Machine check exceptions\n");
112         seq_printf(p, "%*s: ", prec, "MCP");
113         for_each_online_cpu(j)
114                 seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
115         seq_printf(p, "  Machine check polls\n");
116 #endif
117         seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
118 #if defined(CONFIG_X86_IO_APIC)
119         seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
120 #endif
121         return 0;
122 }
123
124 int show_interrupts(struct seq_file *p, void *v)
125 {
126         unsigned long flags, any_count = 0;
127         int i = *(loff_t *) v, j, prec;
128         struct irqaction *action;
129         struct irq_desc *desc;
130
131         if (i > nr_irqs)
132                 return 0;
133
134         for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
135                 j *= 10;
136
137         if (i == nr_irqs)
138                 return show_other_interrupts(p, prec);
139
140         /* print header */
141         if (i == 0) {
142                 seq_printf(p, "%*s", prec + 8, "");
143                 for_each_online_cpu(j)
144                         seq_printf(p, "CPU%-8d", j);
145                 seq_putc(p, '\n');
146         }
147
148         desc = irq_to_desc(i);
149         if (!desc)
150                 return 0;
151
152         spin_lock_irqsave(&desc->lock, flags);
153         for_each_online_cpu(j)
154                 any_count |= kstat_irqs_cpu(i, j);
155         action = desc->action;
156         if (!action && !any_count)
157                 goto out;
158
159         seq_printf(p, "%*d: ", prec, i);
160         for_each_online_cpu(j)
161                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
162         seq_printf(p, " %8s", desc->chip->name);
163         seq_printf(p, "-%-8s", desc->name);
164
165         if (action) {
166                 seq_printf(p, "  %s", action->name);
167                 while ((action = action->next) != NULL)
168                         seq_printf(p, ", %s", action->name);
169         }
170
171         seq_putc(p, '\n');
172 out:
173         spin_unlock_irqrestore(&desc->lock, flags);
174         return 0;
175 }
176
177 /*
178  * /proc/stat helpers
179  */
180 u64 arch_irq_stat_cpu(unsigned int cpu)
181 {
182         u64 sum = irq_stats(cpu)->__nmi_count;
183
184 #ifdef CONFIG_X86_LOCAL_APIC
185         sum += irq_stats(cpu)->apic_timer_irqs;
186         sum += irq_stats(cpu)->irq_spurious_count;
187         sum += irq_stats(cpu)->apic_perf_irqs;
188         sum += irq_stats(cpu)->apic_pending_irqs;
189 #endif
190         if (generic_interrupt_extension)
191                 sum += irq_stats(cpu)->generic_irqs;
192 #ifdef CONFIG_SMP
193         sum += irq_stats(cpu)->irq_resched_count;
194         sum += irq_stats(cpu)->irq_call_count;
195         sum += irq_stats(cpu)->irq_tlb_count;
196 #endif
197 #ifdef CONFIG_X86_MCE
198         sum += irq_stats(cpu)->irq_thermal_count;
199 # ifdef CONFIG_X86_MCE_THRESHOLD
200         sum += irq_stats(cpu)->irq_threshold_count;
201 # endif
202 #endif
203 #ifdef CONFIG_X86_MCE
204         sum += per_cpu(mce_exception_count, cpu);
205         sum += per_cpu(mce_poll_count, cpu);
206 #endif
207         return sum;
208 }
209
210 u64 arch_irq_stat(void)
211 {
212         u64 sum = atomic_read(&irq_err_count);
213
214 #ifdef CONFIG_X86_IO_APIC
215         sum += atomic_read(&irq_mis_count);
216 #endif
217         return sum;
218 }
219
220
221 /*
222  * do_IRQ handles all normal device IRQ's (the special
223  * SMP cross-CPU interrupts have their own specific
224  * handlers).
225  */
226 unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
227 {
228         struct pt_regs *old_regs = set_irq_regs(regs);
229
230         /* high bit used in ret_from_ code  */
231         unsigned vector = ~regs->orig_ax;
232         unsigned irq;
233
234         exit_idle();
235         irq_enter();
236
237         irq = __get_cpu_var(vector_irq)[vector];
238
239         if (!handle_irq(irq, regs)) {
240                 ack_APIC_irq();
241
242                 if (printk_ratelimit())
243                         pr_emerg("%s: %d.%d No irq handler for vector (irq %d)\n",
244                                 __func__, smp_processor_id(), vector, irq);
245         }
246
247         irq_exit();
248
249         set_irq_regs(old_regs);
250         return 1;
251 }
252
253 /*
254  * Handler for GENERIC_INTERRUPT_VECTOR.
255  */
256 void smp_generic_interrupt(struct pt_regs *regs)
257 {
258         struct pt_regs *old_regs = set_irq_regs(regs);
259
260         ack_APIC_irq();
261
262         exit_idle();
263
264         irq_enter();
265
266         inc_irq_stat(generic_irqs);
267
268         if (generic_interrupt_extension)
269                 generic_interrupt_extension();
270
271         irq_exit();
272
273         set_irq_regs(old_regs);
274 }
275
276 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);