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Don Zickus
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Ingo Molnar
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Oct 10, 2011
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 144d31e6f1902a39bc95754d820d356722697850 | ||
| refs/heads/master: 1d48922c14b6363f6d5febb12464d804bb5cc53f |
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| /* | ||
| * Copyright (C) 1991, 1992 Linus Torvalds | ||
| * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | ||
| * | ||
| * Pentium III FXSR, SSE support | ||
| * Gareth Hughes <gareth@valinux.com>, May 2000 | ||
| */ | ||
|
|
||
| /* | ||
| * Handle hardware traps and faults. | ||
| */ | ||
| #include <linux/spinlock.h> | ||
| #include <linux/kprobes.h> | ||
| #include <linux/kdebug.h> | ||
| #include <linux/nmi.h> | ||
|
|
||
| #if defined(CONFIG_EDAC) | ||
| #include <linux/edac.h> | ||
| #endif | ||
|
|
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| #include <linux/atomic.h> | ||
| #include <asm/traps.h> | ||
| #include <asm/mach_traps.h> | ||
|
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| static int ignore_nmis; | ||
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| int unknown_nmi_panic; | ||
| /* | ||
| * Prevent NMI reason port (0x61) being accessed simultaneously, can | ||
| * only be used in NMI handler. | ||
| */ | ||
| static DEFINE_RAW_SPINLOCK(nmi_reason_lock); | ||
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||
| static int __init setup_unknown_nmi_panic(char *str) | ||
| { | ||
| unknown_nmi_panic = 1; | ||
| return 1; | ||
| } | ||
| __setup("unknown_nmi_panic", setup_unknown_nmi_panic); | ||
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| static notrace __kprobes void | ||
| pci_serr_error(unsigned char reason, struct pt_regs *regs) | ||
| { | ||
| pr_emerg("NMI: PCI system error (SERR) for reason %02x on CPU %d.\n", | ||
| reason, smp_processor_id()); | ||
|
|
||
| /* | ||
| * On some machines, PCI SERR line is used to report memory | ||
| * errors. EDAC makes use of it. | ||
| */ | ||
| #if defined(CONFIG_EDAC) | ||
| if (edac_handler_set()) { | ||
| edac_atomic_assert_error(); | ||
| return; | ||
| } | ||
| #endif | ||
|
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| if (panic_on_unrecovered_nmi) | ||
| panic("NMI: Not continuing"); | ||
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| pr_emerg("Dazed and confused, but trying to continue\n"); | ||
|
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| /* Clear and disable the PCI SERR error line. */ | ||
| reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_SERR; | ||
| outb(reason, NMI_REASON_PORT); | ||
| } | ||
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| static notrace __kprobes void | ||
| io_check_error(unsigned char reason, struct pt_regs *regs) | ||
| { | ||
| unsigned long i; | ||
|
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||
| pr_emerg( | ||
| "NMI: IOCK error (debug interrupt?) for reason %02x on CPU %d.\n", | ||
| reason, smp_processor_id()); | ||
| show_registers(regs); | ||
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| if (panic_on_io_nmi) | ||
| panic("NMI IOCK error: Not continuing"); | ||
|
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| /* Re-enable the IOCK line, wait for a few seconds */ | ||
| reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_IOCHK; | ||
| outb(reason, NMI_REASON_PORT); | ||
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| i = 20000; | ||
| while (--i) { | ||
| touch_nmi_watchdog(); | ||
| udelay(100); | ||
| } | ||
|
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| reason &= ~NMI_REASON_CLEAR_IOCHK; | ||
| outb(reason, NMI_REASON_PORT); | ||
| } | ||
|
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| static notrace __kprobes void | ||
| unknown_nmi_error(unsigned char reason, struct pt_regs *regs) | ||
| { | ||
| if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == | ||
| NOTIFY_STOP) | ||
| return; | ||
| #ifdef CONFIG_MCA | ||
| /* | ||
| * Might actually be able to figure out what the guilty party | ||
| * is: | ||
| */ | ||
| if (MCA_bus) { | ||
| mca_handle_nmi(); | ||
| return; | ||
| } | ||
| #endif | ||
| pr_emerg("Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", | ||
| reason, smp_processor_id()); | ||
|
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| pr_emerg("Do you have a strange power saving mode enabled?\n"); | ||
| if (unknown_nmi_panic || panic_on_unrecovered_nmi) | ||
| panic("NMI: Not continuing"); | ||
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| pr_emerg("Dazed and confused, but trying to continue\n"); | ||
| } | ||
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| static notrace __kprobes void default_do_nmi(struct pt_regs *regs) | ||
| { | ||
| unsigned char reason = 0; | ||
|
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| /* | ||
| * CPU-specific NMI must be processed before non-CPU-specific | ||
| * NMI, otherwise we may lose it, because the CPU-specific | ||
| * NMI can not be detected/processed on other CPUs. | ||
| */ | ||
| if (notify_die(DIE_NMI, "nmi", regs, 0, 2, SIGINT) == NOTIFY_STOP) | ||
| return; | ||
|
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| /* Non-CPU-specific NMI: NMI sources can be processed on any CPU */ | ||
| raw_spin_lock(&nmi_reason_lock); | ||
| reason = get_nmi_reason(); | ||
|
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||
| if (reason & NMI_REASON_MASK) { | ||
| if (reason & NMI_REASON_SERR) | ||
| pci_serr_error(reason, regs); | ||
| else if (reason & NMI_REASON_IOCHK) | ||
| io_check_error(reason, regs); | ||
| #ifdef CONFIG_X86_32 | ||
| /* | ||
| * Reassert NMI in case it became active | ||
| * meanwhile as it's edge-triggered: | ||
| */ | ||
| reassert_nmi(); | ||
| #endif | ||
| raw_spin_unlock(&nmi_reason_lock); | ||
| return; | ||
| } | ||
| raw_spin_unlock(&nmi_reason_lock); | ||
|
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| unknown_nmi_error(reason, regs); | ||
| } | ||
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| dotraplinkage notrace __kprobes void | ||
| do_nmi(struct pt_regs *regs, long error_code) | ||
| { | ||
| nmi_enter(); | ||
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| inc_irq_stat(__nmi_count); | ||
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| if (!ignore_nmis) | ||
| default_do_nmi(regs); | ||
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| nmi_exit(); | ||
| } | ||
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| void stop_nmi(void) | ||
| { | ||
| ignore_nmis++; | ||
| } | ||
|
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| void restart_nmi(void) | ||
| { | ||
| ignore_nmis--; | ||
| } |
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