mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 21:11:47 +07:00
b52e0a7c4e
The following change fixes the x86 implementation of trigger_all_cpu_backtrace(), which was previously (accidentally, as far as I can tell) disabled to always return false as on architectures that do not implement this function. trigger_all_cpu_backtrace(), as defined in include/linux/nmi.h, should call arch_trigger_all_cpu_backtrace() if available, or return false if the underlying arch doesn't implement this function. x86 did provide a suitable arch_trigger_all_cpu_backtrace() implementation, but it wasn't actually being used because it was declared in asm/nmi.h, which linux/nmi.h doesn't include. Also, linux/nmi.h couldn't easily be fixed by including asm/nmi.h, because that file is not available on all architectures. I am proposing to fix this by moving the x86 definition of arch_trigger_all_cpu_backtrace() to asm/irq.h. Tested via: echo l > /proc/sysrq-trigger Before the change, this uses a fallback implementation which shows backtraces on active CPUs (using smp_call_function_interrupt() ) After the change, this shows NMI backtraces on all CPUs Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1370518875-1346-1-git-send-email-walken@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
#ifndef _ASM_X86_NMI_H
|
|
#define _ASM_X86_NMI_H
|
|
|
|
#include <linux/pm.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
|
|
extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
|
|
extern int reserve_perfctr_nmi(unsigned int);
|
|
extern void release_perfctr_nmi(unsigned int);
|
|
extern int reserve_evntsel_nmi(unsigned int);
|
|
extern void release_evntsel_nmi(unsigned int);
|
|
|
|
struct ctl_table;
|
|
extern int proc_nmi_enabled(struct ctl_table *, int ,
|
|
void __user *, size_t *, loff_t *);
|
|
extern int unknown_nmi_panic;
|
|
|
|
#endif /* CONFIG_X86_LOCAL_APIC */
|
|
|
|
#define NMI_FLAG_FIRST 1
|
|
|
|
enum {
|
|
NMI_LOCAL=0,
|
|
NMI_UNKNOWN,
|
|
NMI_SERR,
|
|
NMI_IO_CHECK,
|
|
NMI_MAX
|
|
};
|
|
|
|
#define NMI_DONE 0
|
|
#define NMI_HANDLED 1
|
|
|
|
typedef int (*nmi_handler_t)(unsigned int, struct pt_regs *);
|
|
|
|
struct nmiaction {
|
|
struct list_head list;
|
|
nmi_handler_t handler;
|
|
unsigned long flags;
|
|
const char *name;
|
|
};
|
|
|
|
#define register_nmi_handler(t, fn, fg, n, init...) \
|
|
({ \
|
|
static struct nmiaction init fn##_na = { \
|
|
.handler = (fn), \
|
|
.name = (n), \
|
|
.flags = (fg), \
|
|
}; \
|
|
__register_nmi_handler((t), &fn##_na); \
|
|
})
|
|
|
|
int __register_nmi_handler(unsigned int, struct nmiaction *);
|
|
|
|
void unregister_nmi_handler(unsigned int, const char *);
|
|
|
|
void stop_nmi(void);
|
|
void restart_nmi(void);
|
|
void local_touch_nmi(void);
|
|
|
|
#endif /* _ASM_X86_NMI_H */
|