[PATCH 6/9] rpmsg: virtio: use rpmsg ns device for the ns announcement

Arnaud Pouliquen
2020-07-31T11:47:56Z

As generic NS driver is available, rely on it for NS management instead of
managing it in RPMsg virtio bus.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
drivers/rpmsg/Kconfig | 1 +
drivers/rpmsg/virtio_rpmsg_bus.c | 86 ++++++++------------------------
2 files changed, 21 insertions(+), 66 deletions(-)

diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig
index 140faa975ea1..0143c9864c45 100644
--- a/drivers/rpmsg/Kconfig
+++ b/drivers/rpmsg/Kconfig
@@ -71,5 +71,6 @@ config RPMSG_VIRTIO
depends on HAS_DMA
select RPMSG
select VIRTIO
+ select RPMSG_NS

endmenu
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index b2927661868c..f771fdae150e 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -48,7 +48,6 @@
* @endpoints_lock: lock of the endpoints set
* @sendq: wait queue of sending contexts waiting for a tx buffers
* @sleepers: number of senders that are waiting for a tx buffer
- * @ns_ept: the bus's name service endpoint
*
* This structure stores the rpmsg state of a given virtio remote processor
* device (there might be several virtio proc devices for each physical
@@ -67,7 +66,6 @@ struct virtproc_info {
struct mutex endpoints_lock;
wait_queue_head_t sendq;
atomic_t sleepers;
- struct rpmsg_endpoint *ns_ept;
};

/* The feature bitmap for virtio rpmsg */
@@ -841,68 +839,14 @@ static void rpmsg_xmit_done(struct virtqueue *svq)
wake_up_interruptible(&vrp->sendq);
}

-/* invoked when a name service announcement arrives */
-static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
- void *priv, u32 src)
-{
- struct rpmsg_ns_msg *msg = data;
- struct rpmsg_device *newch;
- struct rpmsg_channel_info chinfo;
- struct virtproc_info *vrp = priv;
- struct device *dev = &vrp->vdev->dev;
- int ret;
-
-#if defined(CONFIG_DYNAMIC_DEBUG)
- dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1,
- data, len, true);
-#endif
-
- if (len != sizeof(*msg)) {
- dev_err(dev, "malformed ns msg (%d)\n", len);
- return -EINVAL;
- }
-
- /*
- * the name service ept does _not_ belong to a real rpmsg channel,
- * and is handled by the rpmsg bus itself.
- * for sanity reasons, make sure a valid rpdev has _not_ sneaked
- * in somehow.
- */
- if (rpdev) {
- dev_err(dev, "anomaly: ns ept has an rpdev handle\n");
- return -EINVAL;
- }
-
- /* don't trust the remote processor for null terminating the name */
- msg->name[RPMSG_NAME_SIZE - 1] = '\0';
-
- strncpy(chinfo.name, msg->name, sizeof(chinfo.name));
- chinfo.src = RPMSG_ADDR_ANY;
- chinfo.dst = virtio32_to_cpu(vrp->vdev, msg->addr);
-
- dev_info(dev, "%sing channel %s addr 0x%x\n",
- virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY ?
- "destroy" : "creat", msg->name, chinfo.dst);
-
- if (virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY) {
- ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo);
- if (ret)
- dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
- } else {
- newch = __rpmsg_create_channel(vrp, &chinfo);
- if (!newch)
- dev_err(dev, "rpmsg_create_channel failed\n");
- }
-
- return 0;
-}
-
static int rpmsg_probe(struct virtio_device *vdev)
{
vq_callback_t *vq_cbs[] = { rpmsg_recv_done, rpmsg_xmit_done };
static const char * const names[] = { "input", "output" };
struct virtqueue *vqs[2];
struct virtproc_info *vrp;
+ struct virtio_rpmsg_channel *vch;
+ struct rpmsg_device *rpdev_ns;
void *bufs_va;
int err = 0, i;
size_t total_buf_space;
@@ -978,14 +922,27 @@ static int rpmsg_probe(struct virtio_device *vdev)

/* if supported by the remote processor, enable the name service */
if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_NS)) {
- /* a dedicated endpoint handles the name service msgs */
- vrp->ns_ept = __rpmsg_create_ept(vrp, NULL, rpmsg_ns_cb,
- vrp, RPMSG_NS_ADDR);
- if (!vrp->ns_ept) {
- dev_err(&vdev->dev, "failed to create the ns ept\n");
+ vch = kzalloc(sizeof(*vch), GFP_KERNEL);
+ if (!vch) {
err = -ENOMEM;
goto free_coherent;
}
+
+ /* Link the channel to our vrp */
+ vch->vrp = vrp;
+
+ /* Assign public information to the rpmsg_device */
+ rpdev_ns = &vch->rpdev;
+ rpdev_ns->ops = &virtio_rpmsg_ops;
+
+ rpdev_ns->dev.parent = &vrp->vdev->dev;
+ rpdev_ns->dev.release = virtio_rpmsg_release_device;
+
+ err = rpmsg_ns_register_device(rpdev_ns);
+ if (err) {
+ kfree(vch);
+ goto free_coherent;
+ }
}

/*
@@ -1038,9 +995,6 @@ static void rpmsg_remove(struct virtio_device *vdev)
if (ret)
dev_warn(&vdev->dev, "can't remove rpmsg device: %d\n", ret);

- if (vrp->ns_ept)
- __rpmsg_destroy_ept(vrp, vrp->ns_ept);
-
idr_destroy(&vrp->endpoints);

vdev->config->del_vqs(vrp->vdev);
--
2.17.1