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devices: interrupt: add simple resample

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Instead of coupling the reading of the event fd and the resampling of
the interrupt, add a separate member to just do the resample.

This will be used by async code that waits for and reads the event fd in
one step.

Change-Id: Ic5b1fd9adf8e32a572f31dc1c0c5ab32e94f4981
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2268978
Commit-Queue: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
This commit is contained in:
Dylan Reid 2020-06-24 22:22:36 -07:00 committed by Commit Bot
parent 5b09409f59
commit 95f1bca33a
1 changed files with 7 additions and 1 deletions
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8
devices/src/virtio/interrupt.rs
View file

@ -72,9 +72,15 @@ impl Interrupt {
self.signal(self.config_msix_vector, INTERRUPT_STATUS_CONFIG_CHANGED)
}
/// Handle interrupt resampling event
/// Handle interrupt resampling event, reading the value from the event and doing the resample.
pub fn interrupt_resample(&self) {
let _ = self.interrupt_resample_evt.read();
self.do_interrupt_resample();
}
/// Read the status and write to the interrupt event. Don't read the resample event, assume the
/// resample has been requested.
pub fn do_interrupt_resample(&self) {
if self.interrupt_status.load(Ordering::SeqCst) != 0 {
self.interrupt_evt.write(1).unwrap();
}