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From: Alex Williamson <alex.williamson@redhat.com>
To: kvm@vger.kernel.org
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	dev@dpdk.org, mtosatti@redhat.com, thomas@monjalon.net,
	bluca@debian.org, jerinjacobk@gmail.com,
	bruce.richardson@intel.com, cohuck@redhat.com
Subject: [dpdk-dev] [PATCH 1/7] vfio: Include optional device match in vfio_device_ops callbacks
Date: Tue, 11 Feb 2020 16:05:25 -0700
Message-ID: <158146232551.16827.14170770732904274160.stgit@gimli.home> (raw)
In-Reply-To: <158145472604.16827.15751375540102298130.stgit@gimli.home>

Allow bus drivers to provide their own callback to match a device to
the user provided string.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 drivers/vfio/vfio.c  |   20 ++++++++++++++++----
 include/linux/vfio.h |    4 ++++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index c8482624ca34..0bd77d6ea691 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -875,11 +875,23 @@ EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);
 static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
 						     char *buf)
 {
-	struct vfio_device *it, *device = NULL;
+	struct vfio_device *it, *device = ERR_PTR(-ENODEV);
 
 	mutex_lock(&group->device_lock);
 	list_for_each_entry(it, &group->device_list, group_next) {
-		if (!strcmp(dev_name(it->dev), buf)) {
+		int ret;
+
+		if (it->ops->match) {
+			ret = it->ops->match(it->device_data, buf);
+			if (ret < 0) {
+				device = ERR_PTR(ret);
+				break;
+			}
+		} else {
+			ret = !strcmp(dev_name(it->dev), buf);
+		}
+
+		if (ret) {
 			device = it;
 			vfio_device_get(device);
 			break;
@@ -1430,8 +1442,8 @@ static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
 		return -EPERM;
 
 	device = vfio_device_get_from_name(group, buf);
-	if (!device)
-		return -ENODEV;
+	if (IS_ERR(device))
+		return PTR_ERR(device);
 
 	ret = device->ops->open(device->device_data);
 	if (ret) {
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index e42a711a2800..029694b977f2 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -26,6 +26,9 @@
  *         operations documented below
  * @mmap: Perform mmap(2) on a region of the device file descriptor
  * @request: Request for the bus driver to release the device
+ * @match: Optional device name match callback (return: 0 for no-match, >0 for
+ *         match, -errno for abort (ex. match with insufficient or incorrect
+ *         additional args)
  */
 struct vfio_device_ops {
 	char	*name;
@@ -39,6 +42,7 @@ struct vfio_device_ops {
 			 unsigned long arg);
 	int	(*mmap)(void *device_data, struct vm_area_struct *vma);
 	void	(*request)(void *device_data, unsigned int count);
+	int	(*match)(void *device_data, char *buf);
 };
 
 extern struct iommu_group *vfio_iommu_group_get(struct device *dev);


  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 23:05 [dpdk-dev] [PATCH 0/7] vfio/pci: SR-IOV support Alex Williamson
2020-02-11 23:05 ` Alex Williamson [this message]
2020-02-13 10:31   ` [dpdk-dev] [PATCH 1/7] vfio: Include optional device match in vfio_device_ops callbacks Cornelia Huck
2020-02-11 23:05 ` [dpdk-dev] [PATCH 2/7] vfio/pci: Implement match ops Alex Williamson
2020-02-13 11:04   ` Cornelia Huck
2020-02-11 23:05 ` [dpdk-dev] [PATCH 3/7] vfio/pci: Introduce VF token Alex Williamson
2020-02-13 11:46   ` Cornelia Huck
2020-02-13 17:23     ` Alex Williamson
2020-02-13 18:35       ` Cornelia Huck
2020-02-14 23:40         ` Alex Williamson
2020-02-11 23:05 ` [dpdk-dev] [PATCH 4/7] vfio: Introduce VFIO_DEVICE_FEATURE ioctl and first user Alex Williamson
2020-02-13 12:41   ` Cornelia Huck
2020-02-13 17:39     ` Alex Williamson
2020-02-13 18:08       ` Cornelia Huck
2020-02-11 23:06 ` [dpdk-dev] [PATCH 5/7] vfio/pci: Add sriov_configure support Alex Williamson
2020-02-11 23:06 ` [dpdk-dev] [PATCH 6/7] vfio/pci: Remove dev_fmt definition Alex Williamson
2020-02-11 23:06 ` [dpdk-dev] [PATCH 7/7] vfio/pci: Cleanup .probe() exit paths Alex Williamson
2020-02-14  4:57 ` [dpdk-dev] [PATCH 0/7] vfio/pci: SR-IOV support Alexey Kardashevskiy
2020-02-14 15:27   ` Alex Williamson

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