From: Parav Pandit <parav@nvidia.com>
Date: Tue, 26 Oct 2021 20:55:12 +0300
Subject: vdpa: Introduce and use vdpa device get, set config helpers
Patch-mainline: v5.16-rc1
Git-commit: 6dbb1f1687a2ccdfc5b84b0a35bbc6dfefc4de3b
References: jsc#PED-1549

Subsequent patches enable get and set configuration either
via management device or via vdpa device' config ops.

This requires synchronization between multiple callers to get and set
config callbacks. Features setting also influence the layout of the
configuration fields endianness.

To avoid exposing synchronization primitives to callers, introduce
helper for setting the configuration and use it.

Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20211026175519.87795-2-parav@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/vdpa/vdpa.c          |   36 ++++++++++++++++++++++++++++++++++++
 drivers/vhost/vdpa.c         |    3 +--
 drivers/virtio/virtio_vdpa.c |    3 +--
 include/linux/vdpa.h         |   19 ++++---------------
 4 files changed, 42 insertions(+), 19 deletions(-)

--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -297,6 +297,42 @@ void vdpa_mgmtdev_unregister(struct vdpa
 }
 EXPORT_SYMBOL_GPL(vdpa_mgmtdev_unregister);
 
+/**
+ * vdpa_get_config - Get one or more device configuration fields.
+ * @vdev: vdpa device to operate on
+ * @offset: starting byte offset of the field
+ * @buf: buffer pointer to read to
+ * @len: length of the configuration fields in bytes
+ */
+void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
+		     void *buf, unsigned int len)
+{
+	const struct vdpa_config_ops *ops = vdev->config;
+
+	/*
+	 * Config accesses aren't supposed to trigger before features are set.
+	 * If it does happen we assume a legacy guest.
+	 */
+	if (!vdev->features_valid)
+		vdpa_set_features(vdev, 0);
+	ops->get_config(vdev, offset, buf, len);
+}
+EXPORT_SYMBOL_GPL(vdpa_get_config);
+
+/**
+ * vdpa_set_config - Set one or more device configuration fields.
+ * @vdev: vdpa device to operate on
+ * @offset: starting byte offset of the field
+ * @buf: buffer pointer to read from
+ * @length: length of the configuration fields in bytes
+ */
+void vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
+		     const void *buf, unsigned int length)
+{
+	vdev->config->set_config(vdev, offset, buf, length);
+}
+EXPORT_SYMBOL_GPL(vdpa_set_config);
+
 static bool mgmtdev_handle_match(const struct vdpa_mgmt_dev *mdev,
 				 const char *busname, const char *devname)
 {
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -237,7 +237,6 @@ static long vhost_vdpa_set_config(struct
 				  struct vhost_vdpa_config __user *c)
 {
 	struct vdpa_device *vdpa = v->vdpa;
-	const struct vdpa_config_ops *ops = vdpa->config;
 	struct vhost_vdpa_config config;
 	unsigned long size = offsetof(struct vhost_vdpa_config, buf);
 	u8 *buf;
@@ -251,7 +250,7 @@ static long vhost_vdpa_set_config(struct
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
-	ops->set_config(vdpa, config.off, buf, config.len);
+	vdpa_set_config(vdpa, config.off, buf, config.len);
 
 	kvfree(buf);
 	return 0;
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -65,9 +65,8 @@ static void virtio_vdpa_set(struct virti
 			    const void *buf, unsigned len)
 {
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
-	const struct vdpa_config_ops *ops = vdpa->config;
 
-	ops->set_config(vdpa, offset, buf, len);
+	vdpa_set_config(vdpa, offset, buf, len);
 }
 
 static u32 virtio_vdpa_generation(struct virtio_device *vdev)
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -386,21 +386,10 @@ static inline int vdpa_set_features(stru
 	return ops->set_features(vdev, features);
 }
 
-static inline void vdpa_get_config(struct vdpa_device *vdev,
-				   unsigned int offset, void *buf,
-				   unsigned int len)
-{
-	const struct vdpa_config_ops *ops = vdev->config;
-
-	/*
-	 * Config accesses aren't supposed to trigger before features are set.
-	 * If it does happen we assume a legacy guest.
-	 */
-	if (!vdev->features_valid)
-		vdpa_set_features(vdev, 0);
-	ops->get_config(vdev, offset, buf, len);
-}
-
+void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
+		     void *buf, unsigned int len);
+void vdpa_set_config(struct vdpa_device *dev, unsigned int offset,
+		     const void *buf, unsigned int length);
 /**
  * struct vdpa_mgmtdev_ops - vdpa device ops
  * @dev_add: Add a vdpa device using alloc and register