53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
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/*
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* This is arch independent NMI watchdog implementaion part. It is used to
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* detect kernel lockups and help debugging. each architecture must add its own
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* low level code that triggers periodic checks
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*/
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#include "watchdog.h"
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unsigned watchdog_local_timer_ticks;
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struct arch_watchdog *watchdog;
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int watchdog_enabled;
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void nmi_watchdog_handler(struct nmi_frame * frame)
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{
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/* FIXME this should be CPU local */
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static unsigned no_ticks;
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static unsigned last_tick_count = (unsigned) -1;
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/*
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* when debugging on serial console, printing takes a lot of time some
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* times while the kernel is certainly not locked up. We don't want to
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* report a lockup in such situation
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*/
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if (serial_debug_active)
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goto reset_and_continue;
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if (last_tick_count != watchdog_local_timer_ticks) {
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if (no_ticks == 1) {
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kprintf("watchdog : kernel unlocked\n");
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no_ticks = 0;
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}
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/* we are still ticking, everything seems good */
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last_tick_count = watchdog_local_timer_ticks;
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goto reset_and_continue;
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}
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/*
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* if watchdog_local_timer_ticks didn't changed since last time, give it
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* some more time and only if it still dead, trigger the watchdog alarm
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*/
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if (++no_ticks < 10) {
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if (no_ticks == 1)
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kprintf("WARNING watchdog : possible kernel lockup\n");
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goto reset_and_continue;
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}
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arch_watchdog_lockup(frame);
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reset_and_continue:
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if (watchdog->reinit)
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watchdog->reinit(cpuid);
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}
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