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

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Date:   Thu,  2 May 2019 14:47:53 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     linux-nvme@...ts.infradead.org
Cc:     Maxim Levitsky <mlevitsk@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Jens Axboe <axboe@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "David S . Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "Paul E . McKenney " <paulmck@...ux.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Liang Cunming <cunming.liang@...el.com>,
        Liu Changpeng <changpeng.liu@...el.com>,
        Fam Zheng <fam@...hon.net>, Amnon Ilan <ailan@...hat.com>,
        John Ferlan <jferlan@...hat.com>
Subject: [PATCH v2 02/10] vfio/mdev: add .request callback

This will allow the hotplug to be enabled for mediated devices

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.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