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553222f3e8
In discussions with Thomas Mingarelli about hpwdt, he explained to me some issues they were some when using their virtual NMI button to test the hpwdt driver. It turns out the virtual NMI button used on HP's machines do no send unknown NMIs but instead send IO_CHK NMIs. The way the kernel code is written, the hpwdt driver can not register itself against that type of NMI and therefore can not successfully capture system information before panic'ing. To solve this I created two new NMI queues to allow driver to register against the IO_CHK and SERR NMIs. Or in the hpwdt all three (if you include unknown NMIs too). The change is straightforward and just mimics what the unknown NMI does. Reported-and-tested-by: Thomas Mingarelli <thomas.mingarelli@hp.com> Signed-off-by: Don Zickus <dzickus@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/1333051877-15755-3-git-send-email-dzickus@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#ifndef _ASM_X86_NMI_H
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#define _ASM_X86_NMI_H
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#include <linux/pm.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#ifdef CONFIG_X86_LOCAL_APIC
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extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
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extern int reserve_perfctr_nmi(unsigned int);
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extern void release_perfctr_nmi(unsigned int);
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extern int reserve_evntsel_nmi(unsigned int);
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extern void release_evntsel_nmi(unsigned int);
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struct ctl_table;
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extern int proc_nmi_enabled(struct ctl_table *, int ,
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void __user *, size_t *, loff_t *);
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extern int unknown_nmi_panic;
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void arch_trigger_all_cpu_backtrace(void);
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#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
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#endif
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#define NMI_FLAG_FIRST 1
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enum {
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NMI_LOCAL=0,
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NMI_UNKNOWN,
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NMI_SERR,
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NMI_IO_CHECK,
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NMI_MAX
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};
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#define NMI_DONE 0
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#define NMI_HANDLED 1
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typedef int (*nmi_handler_t)(unsigned int, struct pt_regs *);
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int register_nmi_handler(unsigned int, nmi_handler_t, unsigned long,
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const char *);
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void unregister_nmi_handler(unsigned int, const char *);
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void stop_nmi(void);
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void restart_nmi(void);
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void local_touch_nmi(void);
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#endif /* _ASM_X86_NMI_H */
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