vfio/device: add vfio_set_irq_from_start

To register IRQ eventfd from a specific IRQ, this patch added vfio_set_irq_from_start helper to receive start IRQ number along with count. Signed-off-by: Minwoo Im <[email protected]>
SamsungDS · Nov 19, 2024 · d5102dc · d5102dc
1 parent a261331
commit d5102dc
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Showing 2 changed files with 27 additions and 2 deletions.
diff --git a/include/vfn/vfio/device.h b/include/vfn/vfio/device.h
@@ -37,6 +37,20 @@ struct vfio_device {
  */
 int vfio_set_irq(struct vfio_device *dev, int *eventfds, int count);
 
+/**
+ * vfio_set_irq_from_start - Enable IRQs through eventfds from the given start
+ * @dev: &struct vfio_device
+ * @eventfds: array of eventfds
+ * @start: start irq number
+ * @count: number of eventfds
+ *
+ * Enable interrupts for a range of vectors. See linux/vfio.h for documentation
+ * on the format of @eventfds.
+ *
+ * Return: ``0`` on success, ``-1`` on error and sets ``errno``.
+ */
+int vfio_set_irq_from_start(struct vfio_device *dev, int *eventfds, int start, int count);
+
 /**
  * vfio_disable_irq - Disable all IRQs
  * @dev: &struct vfio_device

diff --git a/src/vfio/device.c b/src/vfio/device.c
@@ -40,7 +40,8 @@
 #include "ccan/minmax/minmax.h"
 #include "ccan/str/str.h"
 
-int vfio_set_irq(struct vfio_device *dev, int *eventfds, int count)
+static int __vfio_set_irq(struct vfio_device *dev, int *eventfds, int start,
+			  int count)
 {
 	struct vfio_irq_set *irq_set;
 	size_t irq_set_size;
@@ -59,7 +60,7 @@ int vfio_set_irq(struct vfio_device *dev, int *eventfds, int count)
 		.argsz = (uint32_t)irq_set_size,
 		.flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER,
 		.index = dev->irq_info.index,
-		.start = 0,
+		.start = start,
 		.count = count,
 	};
 
@@ -75,6 +76,16 @@ int vfio_set_irq(struct vfio_device *dev, int *eventfds, int count)
 
 	return 0;
 }
+int vfio_set_irq(struct vfio_device *dev, int *eventfds, int count)
+{
+	return __vfio_set_irq(dev, eventfds, 0, count);
+}
+
+int vfio_set_irq_from_start(struct vfio_device *dev, int *eventfds, int start,
+			    int count)
+{
+	return __vfio_set_irq(dev, eventfds, start, count);
+}
 
 int vfio_disable_irq(struct vfio_device *dev)
 {