linux-kernel - [RFC net-next v1 1/3] vfio/mdev: Inherit dma masks of parent device

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Date:   Fri,  8 Mar 2019 16:07:54 -0600
From:   Parav Pandit <parav@...lanox.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        michal.lkml@...kovi.net, davem@...emloft.net,
        gregkh@...uxfoundation.org, jiri@...lanox.com, kwankhede@...dia.com
Cc:     parav@...lanox.com, alex.williamson@...hat.com,
        vuhuong@...lanox.com, yuvalav@...lanox.com,
        jakub.kicinski@...ronome.com, kvm@...r.kernel.org
Subject: [RFC net-next v1 1/3] vfio/mdev: Inherit dma masks of parent device

Inherit dma mask of parent device in child mdev devices, so that
protocol stack can use right dma mask while doing dma mappings.

Signed-off-by: Parav Pandit <parav@...lanox.com>
---
 drivers/vfio/mdev/mdev_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 0212f0e..9b8bdc9 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -315,6 +315,10 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
 	mdev->dev.parent  = dev;
 	mdev->dev.bus     = &mdev_bus_type;
 	mdev->dev.release = mdev_device_release;
+	mdev->dev.dma_mask = dev->dma_mask;
+	mdev->dev.dma_parms = dev->dma_parms;
+	mdev->dev.coherent_dma_mask = dev->coherent_dma_mask;
+
 	dev_set_name(&mdev->dev, "%pUl", uuid.b);
 
 	ret = device_register(&mdev->dev);
-- 
1.8.3.1