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Warn instead of panic on long clock update interval

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Zhang Junyang 2024-09-08 21:36:19 +08:00 committed by Tate, Hongliang Tian
parent 787604b7f6
commit 53ce7df53c
1 changed files with 16 additions and 5 deletions
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21
kernel/comps/time/src/clocksource.rs
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@ -82,10 +82,6 @@ impl ClockSource {
}
}
fn cycles_to_nanos(&self, cycles: u64) -> u64 {
self.coeff * cycles
}
/// Uses the instant cycles to calculate the instant.
///
/// It first calculates the difference between the instant cycles and the last
@ -102,12 +98,27 @@ impl ClockSource {
let delta_nanos = {
let delta_cycles = instant_cycles - last_cycles;
self.cycles_to_nanos(delta_cycles)
self.cycles_to_nanos_lossy(delta_cycles)
};
let duration = Duration::from_nanos(delta_nanos);
(last_instant + duration, instant_cycles)
}
fn cycles_to_nanos_lossy(&self, cycles: u64) -> u64 {
let max_cycles = self.base.max_delay_secs * self.base.freq;
if cycles <= max_cycles {
self.coeff * cycles
} else {
log::warn!(
"The clock source becomes not reliable since an \
interval of {} cycles exceeds the maximum delay {}(s)",
cycles,
max_cycles
);
self.coeff * max_cycles
}
}
/// Uses an input instant and cycles to update the `last_record` in the `ClockSource`.
fn update_last_record(&self, record: (Instant, u64)) {
*self.last_record.write_irq_disabled() = record;