vfio/fsl-mc: Add set_irq ioctl interface for fsl-mc devices

This patch add interface of VFIO_DEVICE_SET_IRQS ioctl
for fsl-mc devices.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>

3 files changed, 103 insertions, 1 deletions

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 91decea..176d88b 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -204,7 +204,56 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
 	}
 	case VFIO_DEVICE_SET_IRQS:
 	{
-		return -EINVAL;
+		struct vfio_irq_set hdr;
+		u8 *data = NULL;
+		int ret = 0;
+
+		minsz = offsetofend(struct vfio_irq_set, count);
+
+		if (copy_from_user(&hdr, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (hdr.argsz < minsz)
+			return -EINVAL;
+
+		if (hdr.index >= mc_dev->obj_desc.irq_count)
+			return -EINVAL;
+
+		if (hdr.start != 0 || hdr.count > 1)
+			return -EINVAL;
+
+		if (hdr.count == 0 &&
+		    (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE) ||
+		    !(hdr.flags & VFIO_IRQ_SET_ACTION_TRIGGER)))
+			return -EINVAL;
+
+		if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
+				  VFIO_IRQ_SET_ACTION_TYPE_MASK))
+			return -EINVAL;
+
+		if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
+			size_t size;
+
+			if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
+				size = sizeof(uint8_t);
+			else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
+				size = sizeof(int32_t);
+			else
+				return -EINVAL;
+
+			if (hdr.argsz - minsz < hdr.count * size)
+				return -EINVAL;
+
+			data = memdup_user((void __user *)(arg + minsz),
+					   hdr.count * size);
+			if (IS_ERR(data))
+				return PTR_ERR(data);
+		}
+
+		ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
+						 hdr.index, hdr.start,
+						 hdr.count, data);
+		return ret;
 	}
 	case VFIO_DEVICE_RESET:
 	{
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
index d86dc04..b7baf10 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
@@ -62,3 +62,52 @@ void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev)
 	fsl_mc_free_irqs(mc_dev);
 	kfree(vdev->mc_irqs);
 }
+
+static int vfio_fsl_mc_irq_mask(struct vfio_fsl_mc_device *vdev,
+				unsigned int index, unsigned int start,
+				unsigned int count, uint32_t flags,
+				void *data)
+{
+	return -EINVAL;
+}
+
+static int vfio_fsl_mc_irq_unmask(struct vfio_fsl_mc_device *vdev,
+				unsigned int index, unsigned int start,
+				unsigned int count, uint32_t flags,
+				void *data)
+{
+	return -EINVAL;
+}
+
+static int vfio_fsl_mc_set_irq_trigger(struct vfio_fsl_mc_device *vdev,
+				       unsigned int index, unsigned int start,
+				       unsigned int count, uint32_t flags,
+				       void *data)
+{
+	return -EINVAL;
+}
+
+int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev,
+			       uint32_t flags, unsigned int index,
+			       unsigned int start, unsigned int count,
+			       void *data)
+{
+	int ret = -ENOTTY;
+
+	switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+	case VFIO_IRQ_SET_ACTION_MASK:
+		ret = vfio_fsl_mc_irq_mask(vdev, index, start, count,
+					   flags, data);
+		break;
+	case VFIO_IRQ_SET_ACTION_UNMASK:
+		ret = vfio_fsl_mc_irq_unmask(vdev, index, start, count,
+					     flags, data);
+		break;
+	case VFIO_IRQ_SET_ACTION_TRIGGER:
+		ret = vfio_fsl_mc_set_irq_trigger(vdev, index, start,
+						  count, flags, data);
+		break;
+	}
+
+	return ret;
+}
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
index 6d31c3c..3063fe9 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -45,4 +45,8 @@ struct vfio_fsl_mc_device {
 
 int vfio_fsl_mc_irqs_init(struct vfio_fsl_mc_device *vdev);
 void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev);
+int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev,
+			       uint32_t flags, unsigned int index,
+			       unsigned int start, unsigned int count,
+			       void *data);
 #endif /* VFIO_PCI_PRIVATE_H */