nmi.c (681e4a5e13c1c8315694eb4f44e0cdd84c9082d2) nmi.c (553222f3e81f18da31b2552e18dc519715198590)
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 * Copyright (C) 2011 Don Zickus Red Hat, Inc.
5 *
6 * Pentium III FXSR, SSE support
7 * Gareth Hughes <gareth@valinux.com>, May 2000
8 */

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49 {
50 .lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[0].lock),
51 .head = LIST_HEAD_INIT(nmi_desc[0].head),
52 },
53 {
54 .lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[1].lock),
55 .head = LIST_HEAD_INIT(nmi_desc[1].head),
56 },
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 * Copyright (C) 2011 Don Zickus Red Hat, Inc.
5 *
6 * Pentium III FXSR, SSE support
7 * Gareth Hughes <gareth@valinux.com>, May 2000
8 */

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49 {
50 .lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[0].lock),
51 .head = LIST_HEAD_INIT(nmi_desc[0].head),
52 },
53 {
54 .lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[1].lock),
55 .head = LIST_HEAD_INIT(nmi_desc[1].head),
56 },
57 {
58 .lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[2].lock),
59 .head = LIST_HEAD_INIT(nmi_desc[2].head),
60 },
61 {
62 .lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[3].lock),
63 .head = LIST_HEAD_INIT(nmi_desc[3].head),
64 },
57
58};
59
60struct nmi_stats {
61 unsigned int normal;
62 unsigned int unknown;
63 unsigned int external;
64 unsigned int swallow;

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115 spin_lock_irqsave(&desc->lock, flags);
116
117 /*
118 * most handlers of type NMI_UNKNOWN never return because
119 * they just assume the NMI is theirs. Just a sanity check
120 * to manage expectations
121 */
122 WARN_ON_ONCE(type == NMI_UNKNOWN && !list_empty(&desc->head));
65
66};
67
68struct nmi_stats {
69 unsigned int normal;
70 unsigned int unknown;
71 unsigned int external;
72 unsigned int swallow;

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123 spin_lock_irqsave(&desc->lock, flags);
124
125 /*
126 * most handlers of type NMI_UNKNOWN never return because
127 * they just assume the NMI is theirs. Just a sanity check
128 * to manage expectations
129 */
130 WARN_ON_ONCE(type == NMI_UNKNOWN && !list_empty(&desc->head));
131 WARN_ON_ONCE(type == NMI_SERR && !list_empty(&desc->head));
132 WARN_ON_ONCE(type == NMI_IO_CHECK && !list_empty(&desc->head));
123
124 /*
125 * some handlers need to be executed first otherwise a fake
126 * event confuses some handlers (kdump uses this flag)
127 */
128 if (action->flags & NMI_FLAG_FIRST)
129 list_add_rcu(&action->list, &desc->head);
130 else

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207 }
208}
209
210EXPORT_SYMBOL_GPL(unregister_nmi_handler);
211
212static notrace __kprobes void
213pci_serr_error(unsigned char reason, struct pt_regs *regs)
214{
133
134 /*
135 * some handlers need to be executed first otherwise a fake
136 * event confuses some handlers (kdump uses this flag)
137 */
138 if (action->flags & NMI_FLAG_FIRST)
139 list_add_rcu(&action->list, &desc->head);
140 else

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217 }
218}
219
220EXPORT_SYMBOL_GPL(unregister_nmi_handler);
221
222static notrace __kprobes void
223pci_serr_error(unsigned char reason, struct pt_regs *regs)
224{
225 /* check to see if anyone registered against these types of errors */
226 if (nmi_handle(NMI_SERR, regs, false))
227 return;
228
215 pr_emerg("NMI: PCI system error (SERR) for reason %02x on CPU %d.\n",
216 reason, smp_processor_id());
217
218 /*
219 * On some machines, PCI SERR line is used to report memory
220 * errors. EDAC makes use of it.
221 */
222#if defined(CONFIG_EDAC)

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236 outb(reason, NMI_REASON_PORT);
237}
238
239static notrace __kprobes void
240io_check_error(unsigned char reason, struct pt_regs *regs)
241{
242 unsigned long i;
243
229 pr_emerg("NMI: PCI system error (SERR) for reason %02x on CPU %d.\n",
230 reason, smp_processor_id());
231
232 /*
233 * On some machines, PCI SERR line is used to report memory
234 * errors. EDAC makes use of it.
235 */
236#if defined(CONFIG_EDAC)

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250 outb(reason, NMI_REASON_PORT);
251}
252
253static notrace __kprobes void
254io_check_error(unsigned char reason, struct pt_regs *regs)
255{
256 unsigned long i;
257
258 /* check to see if anyone registered against these types of errors */
259 if (nmi_handle(NMI_IO_CHECK, regs, false))
260 return;
261
244 pr_emerg(
245 "NMI: IOCK error (debug interrupt?) for reason %02x on CPU %d.\n",
246 reason, smp_processor_id());
247 show_registers(regs);
248
249 if (panic_on_io_nmi)
250 panic("NMI IOCK error: Not continuing");
251

--- 286 unchanged lines hidden --- 		262 pr_emerg(
263 "NMI: IOCK error (debug interrupt?) for reason %02x on CPU %d.\n",
264 reason, smp_processor_id());
265 show_registers(regs);
266
267 if (panic_on_io_nmi)
268 panic("NMI IOCK error: Not continuing");
269

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