[v5 09/19] vfio: Register/unregister irq_bypass_producer

[Feng Wu]

This patch adds the registration/unregistration of an
irq_bypass_producer for MSI/MSIx on vfio pci devices.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 drivers/vfio/pci/vfio_pci_intrs.c   | 19 +++++++++++++++++++
 drivers/vfio/pci/vfio_pci_private.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 1f577b4..4795606 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -305,6 +305,16 @@ static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
 	return 0;
 }
 
+void vfio_pci_add_consumer(struct irq_bypass_producer *prod,
+			     struct irq_bypass_consumer *cons)
+{
+}
+
+void vfio_pci_del_consumer(struct irq_bypass_producer *prod,
+			     struct irq_bypass_consumer *cons)
+{
+}
+
 static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
 				      int vector, int fd, bool msix)
 {
@@ -319,6 +329,7 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
 
 	if (vdev->ctx[vector].trigger) {
 		free_irq(irq, vdev->ctx[vector].trigger);
+		irq_bypass_unregister_producer(&vdev->ctx[vector].producer);
 		kfree(vdev->ctx[vector].name);
 		eventfd_ctx_put(vdev->ctx[vector].trigger);
 		vdev->ctx[vector].trigger = NULL;
@@ -360,6 +371,14 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
 		return ret;
 	}
 
+	INIT_LIST_HEAD(&vdev->ctx[vector].producer.node);
+	vdev->ctx[vector].producer.token = trigger;
+	vdev->ctx[vector].producer.irq = irq;
+	vdev->ctx[vector].producer.add_consumer = vfio_pci_add_consumer;
+	vdev->ctx[vector].producer.del_consumer = vfio_pci_del_consumer;
+	ret = irq_bypass_register_producer(&vdev->ctx[vector].producer);
+	WARN_ON(ret);
+
 	vdev->ctx[vector].trigger = trigger;
 
 	return 0;
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index ae0e1b4..0e7394f 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -13,6 +13,7 @@
 
 #include <linux/mutex.h>
 #include <linux/pci.h>
+#include <linux/irqbypass.h>
 
 #ifndef VFIO_PCI_PRIVATE_H
 #define VFIO_PCI_PRIVATE_H
@@ -29,6 +30,7 @@ struct vfio_pci_irq_ctx {
 	struct virqfd		*mask;
 	char			*name;
 	bool			masked;
+	struct irq_bypass_producer	producer;
 };
 
 struct vfio_pci_device {
-- 
2.1.0

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