[PATCH v2 02/10] vfio/mdev: add .request callback

Maxim Levitsky
2019-05-02T11:49:16Z

This will allow the hotplug to be enabled for mediated devices

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
drivers/vfio/mdev/vfio_mdev.c | 11 +++++++++++
include/linux/mdev.h | 4 ++++
2 files changed, 15 insertions(+)

diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index d230620fe02d..17aa76de0764 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -101,6 +101,16 @@ static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
return parent->ops->mmap(mdev, vma);
}

+static void vfio_mdev_request(void *device_data, unsigned int count)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->request))
+ return;
+ parent->ops->request(mdev, count);
+}
+
static const struct vfio_device_ops vfio_mdev_dev_ops = {
.name = "vfio-mdev",
.open = vfio_mdev_open,
@@ -109,6 +119,7 @@ static const struct vfio_device_ops vfio_mdev_dev_ops = {
.read = vfio_mdev_read,
.write = vfio_mdev_write,
.mmap = vfio_mdev_mmap,
+ .request = vfio_mdev_request,
};

static int vfio_mdev_probe(struct device *dev)
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index d7aee90e5da5..6f315cb9575c 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -13,6 +13,9 @@
#ifndef MDEV_H
#define MDEV_H

+#include <linux/uuid.h>
+#include <linux/device.h>
+
struct mdev_device;

/**
@@ -81,6 +84,7 @@ struct mdev_parent_ops {
long (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
unsigned long arg);
int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
+ void (*request)(struct mdev_device *mdev, unsigned int count);
};

/* interface for exporting mdev supported type attributes */
--
2.17.2