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pci: Add MSI-X helper to check if interrupts are enabled

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In order to check if device's interrupts are enabled, this patch adds
a helper function to the MsixConfig structure so that at any point in
time we can check if an interrupt should be delivered or not.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-08-08 08:09:52 -07:00 committed by Rob Bradford
parent 4c9759e4fc
commit c0e2bbb23f
1 changed files with 7 additions and 0 deletions
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7
pci/src/msix.rs
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@ -53,6 +53,7 @@ pub struct MsixConfig {
pub pba_entries: Vec<u64>,
interrupt_cb: Option<Arc<InterruptDelivery>>,
masked: bool,
enabled: bool,
}
impl MsixConfig {
@ -70,6 +71,7 @@ impl MsixConfig {
pba_entries,
interrupt_cb: None,
masked: false,
enabled: false,
}
}
@ -81,10 +83,15 @@ impl MsixConfig {
self.masked
}
pub fn enabled(&self) -> bool {
self.enabled
}
pub fn set_msg_ctl(&mut self, reg: u16) {
let old_masked = self.masked;
self.masked = ((reg >> FUNCTION_MASK_BIT) & 1u16) == 1u16;
self.enabled = ((reg >> MSIX_ENABLE_BIT) & 1u16) == 1u16;
// If the Function Mask bit was set, and has just been cleared, it's
// important to go through the entire PBA to check if there was any