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devices: virtio: factor out interrupt signal function

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This will be used for configuration interrupts as well.

No functional change.

BUG=chromium:854765
TEST=./build_test.py

Change-Id: Iacccfd0a93a5c90783033a8e37598c2683704351
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1898267
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Zide Chen <zide.chen@intel.corp-partner.google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>
This commit is contained in:
Daniel Verkamp 2019-10-31 17:10:51 -07:00 committed by Commit Bot
parent 081ad6b6cd
commit ecfed3ab95
1 changed files with 8 additions and 3 deletions
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11
devices/src/virtio/interrupt.rs
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@ -35,7 +35,7 @@ impl Interrupt {
/// ///
/// If MSI-X is enabled in this device, MSI-X interrupt is preferred. /// If MSI-X is enabled in this device, MSI-X interrupt is preferred.
/// Write to the irqfd to VMM to deliver virtual interrupt to the guest /// Write to the irqfd to VMM to deliver virtual interrupt to the guest
pub fn signal_used_queue(&self, vector: u16) { fn signal(&self, vector: u16, interrupt_status_mask: u32) {
// Don't need to set ISR for MSI-X interrupts // Don't need to set ISR for MSI-X interrupts
if let Some(msix_config) = &self.msix_config { if let Some(msix_config) = &self.msix_config {
let mut msix_config = msix_config.lock(); let mut msix_config = msix_config.lock();
@ -47,11 +47,11 @@ impl Interrupt {
} }
} }
// Set BIT0 in ISR and inject the interrupt if it was not already pending. // Set bit in ISR and inject the interrupt if it was not already pending.
// Don't need to inject the interrupt if the guest hasn't processed it. // Don't need to inject the interrupt if the guest hasn't processed it.
if self if self
.interrupt_status .interrupt_status
.fetch_or(INTERRUPT_STATUS_USED_RING as usize, Ordering::SeqCst) .fetch_or(interrupt_status_mask as usize, Ordering::SeqCst)
== 0 == 0
{ {
// Write to irqfd to inject INTx interrupt // Write to irqfd to inject INTx interrupt
@ -59,6 +59,11 @@ impl Interrupt {
} }
} }
/// Notify the driver that buffers have been placed in the used queue.
pub fn signal_used_queue(&self, vector: u16) {
self.signal(vector, INTERRUPT_STATUS_USED_RING)
}
/// Notification of Device Configuration Changes /// Notification of Device Configuration Changes
/// Set BIT1 in ISR and write to irqfd /// Set BIT1 in ISR and write to irqfd
pub fn signal_config_changed(&self) { pub fn signal_config_changed(&self) {