[RFC v2 5/9] VFIO: platform: add vfio_platform_is_active

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This function returns whether the IRQ is active at irqchip level or
VFIO masked. If either is true, it is considered the IRQ is active.
Currently there is no way to differentiate userspace masked IRQ from
automasked IRQ. There might be false detection of activity. However
it is currently acceptable to have false detection.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>

---
---
 drivers/vfio/platform/vfio_platform_irq.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index aa540db..d00ed24 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -203,6 +203,23 @@ static int vfio_platform_set_automasked(struct vfio_platform_irq *irq,
 	return 0;
 }
 
+static int vfio_platform_is_active(struct vfio_platform_irq *irq)
+{
+	unsigned long flags;
+	bool active, masked, outstanding;
+	int ret;
+
+	spin_lock_irqsave(&irq->lock, flags);
+
+	ret = irq_get_irqchip_state(irq->hwirq, IRQCHIP_STATE_ACTIVE, &active);
+	BUG_ON(ret);
+	masked = irq->masked;
+	outstanding = active || masked;
+
+	spin_unlock_irqrestore(&irq->lock, flags);
+	return outstanding;
+}
+
 static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod)
 {
 }
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux