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[v4,05/13] VFIO: platform: add vfio_platform_set_forwarded

Message ID 1447944843-17731-6-git-send-email-eric.auger@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Eric Auger Nov. 19, 2015, 2:53 p.m. UTC 
This function allows to change the forwarded mode and selects
the IRQ handler accordingly.

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

---
v3 -> v3:
- renamed vfio_platform_set_automasked into
  vfio_platform_set_forwarded
- do not change VFIO_IRQ_INFO_AUTOMASKED setting when turning
  forwarding on/off

v1 -> v2:
- set forwarded flag
---
 drivers/vfio/platform/vfio_platform_irq.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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Patch

diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index c58e0ad..257200b 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -186,6 +186,23 @@  static irqreturn_t vfio_handler(int irq, void *dev_id)
 	return ret;
 }
 
+static int vfio_platform_set_forwarded(struct vfio_platform_irq *irq,
+					   bool forwarded)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&irq->lock, flags);
+	irq->forwarded = forwarded;
+
+	if (!forwarded && (irq->flags & VFIO_IRQ_INFO_AUTOMASKED))
+		irq->handler = vfio_automasked_irq_handler;
+	else
+		irq->handler = vfio_irq_handler;
+
+	spin_unlock_irqrestore(&irq->lock, flags);
+	return 0;
+}
+
 static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod)
 {
 }