arch/x86/include/asm/nmi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_NMI_H
   3 #define _ASM_X86_NMI_H
   4
   5 #include <linux/irq_work.h>
   6 #include <linux/pm.h>
   7 #include <asm/irq.h>
   8 #include <asm/io.h>
   9
  10 #ifdef CONFIG_X86_LOCAL_APIC
  11
  12 extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
  13 extern int reserve_perfctr_nmi(unsigned int);
  14 extern void release_perfctr_nmi(unsigned int);
  15 extern int reserve_evntsel_nmi(unsigned int);
  16 extern void release_evntsel_nmi(unsigned int);
  17
  18 struct ctl_table;
  19 extern int proc_nmi_enabled(struct ctl_table *, int ,
  20                         void __user *, size_t *, loff_t *);
  21 extern int unknown_nmi_panic;
  22
  23 #endif /* CONFIG_X86_LOCAL_APIC */
  24
  25 #define NMI_FLAG_FIRST  1
  26
  27 enum {
  28         NMI_LOCAL=0,
  29         NMI_UNKNOWN,
  30         NMI_SERR,
  31         NMI_IO_CHECK,
  32         NMI_MAX
  33 };
  34
  35 #define NMI_DONE        0
  36 #define NMI_HANDLED     1
  37
  38 typedef int (*nmi_handler_t)(unsigned int, struct pt_regs *);
  39
  40 struct nmiaction {
  41         struct list_head        list;
  42         nmi_handler_t           handler;
  43         u64                     max_duration;
  44         struct irq_work         irq_work;
  45         unsigned long           flags;
  46         const char              *name;
  47 };
  48
  49 #define register_nmi_handler(t, fn, fg, n, init...)     \
  50 ({                                                      \
  51         static struct nmiaction init fn##_na = {        \
  52                 .handler = (fn),                        \
  53                 .name = (n),                            \
  54                 .flags = (fg),                          \
  55         };                                              \
  56         __register_nmi_handler((t), &fn##_na);          \
  57 })
  58
  59 int __register_nmi_handler(unsigned int, struct nmiaction *);
  60
  61 void unregister_nmi_handler(unsigned int, const char *);
  62
  63 void stop_nmi(void);
  64 void restart_nmi(void);
  65 void local_touch_nmi(void);
  66
  67 #endif /* _ASM_X86_NMI_H */