linux-kernel - [RFC PATCH 2/7] vfio/pci: Implement match ops

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Date:   Tue, 04 Feb 2020 16:05:51 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     kvm@...r.kernel.org
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        dev@...k.org, mtosatti@...hat.com, thomas@...jalon.net,
        bluca@...ian.org, jerinjacobk@...il.com,
        bruce.richardson@...el.com, cohuck@...hat.com
Subject: [RFC PATCH 2/7] vfio/pci: Implement match ops

This currently serves the same purpose as the default implementation
but will be expanded for additional functionality.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 drivers/vfio/pci/vfio_pci.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 02206162eaa9..6b3e73a33cbf 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1275,6 +1275,13 @@ static void vfio_pci_request(void *device_data, unsigned int count)
 	mutex_unlock(&vdev->igate);
 }
 
+static int vfio_pci_match(void *device_data, char *buf)
+{
+	struct vfio_pci_device *vdev = device_data;
+
+	return strcmp(pci_name(vdev->pdev), buf) ? -ENODEV : 0;
+}
+
 static const struct vfio_device_ops vfio_pci_ops = {
 	.name		= "vfio-pci",
 	.open		= vfio_pci_open,
@@ -1284,6 +1291,7 @@ static const struct vfio_device_ops vfio_pci_ops = {
 	.write		= vfio_pci_write,
 	.mmap		= vfio_pci_mmap,
 	.request	= vfio_pci_request,
+	.match		= vfio_pci_match,
 };
 
 static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev);