@@ -15,6 +15,14 @@ config RPMSG_CHAR
in /dev. They make it possible for user-space programs to send and
receive rpmsg packets.
+config RPMSG_NS
+ tristate "RPMSG name service announcement"
+ depends on RPMSG
+ help
+ Say Y here to enable the support of the name service announcement
+ channel that probes the associated RPMsg device on remote endpoint
+ service announcement.
+
config RPMSG_MTK_SCP
tristate "MediaTek SCP"
depends on MTK_SCP
@@ -62,6 +70,7 @@ config RPMSG_VIRTIO
tristate "Virtio RPMSG bus driver"
depends on HAS_DMA
select RPMSG
+ select RPMSG_NS
select VIRTIO
endmenu
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_RPMSG) += rpmsg_core.o
obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o
+obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o
obj-$(CONFIG_RPMSG_MTK_SCP) += mtk_rpmsg.o
qcom_glink-objs := qcom_glink_native.o qcom_glink_ssr.o
obj-$(CONFIG_RPMSG_QCOM_GLINK) += qcom_glink.o
new file mode 100644
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2020 - All Rights Reserved
+ */
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/rpmsg.h>
+#include <linux/rpmsg/ns.h>
+#include <linux/slab.h>
+
+#include "rpmsg_internal.h"
+
+/**
+ * rpmsg_ns_register_device() - register name service device based on rpdev
+ * @rpdev: prepared rpdev to be used for creating endpoints
+ *
+ * This function wraps rpmsg_register_device() preparing the rpdev for use as
+ * basis for the rpmsg name service device.
+ */
+int rpmsg_ns_register_device(struct rpmsg_device *rpdev)
+{
+ strcpy(rpdev->id.name, "rpmsg_ns");
+ rpdev->driver_override = "rpmsg_ns";
+ rpdev->src = RPMSG_NS_ADDR;
+ rpdev->dst = RPMSG_NS_ADDR;
+
+ return rpmsg_register_device(rpdev);
+}
+EXPORT_SYMBOL(rpmsg_ns_register_device);
+
+/* 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 device *dev = rpdev->dev.parent;
+ 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;
+ }
+
+ /* 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 = rpmsg32_to_cpu(rpdev, msg->addr);
+
+ dev_info(dev, "%sing channel %s addr 0x%x\n",
+ rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ?
+ "destroy" : "creat", msg->name, chinfo.dst);
+
+ if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) {
+ ret = rpmsg_release_channel(rpdev, &chinfo);
+ if (ret)
+ dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
+ } else {
+ newch = rpmsg_create_channel(rpdev, &chinfo);
+ if (!newch)
+ dev_err(dev, "rpmsg_create_channel failed\n");
+ }
+
+ return 0;
+}
+
+static int rpmsg_ns_probe(struct rpmsg_device *rpdev)
+{
+ struct rpmsg_endpoint *ns_ept;
+ struct rpmsg_channel_info ns_chinfo = {
+ .src = RPMSG_NS_ADDR,
+ .dst = RPMSG_NS_ADDR,
+ .name = "name_service",
+ };
+
+ /*
+ * Create the NS announcement service endpoint associated to the RPMsg
+ * device. The endpoint will be automatically destroyed when the RPMsg
+ * device will be deleted.
+ */
+ ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo);
+ if (!ns_ept) {
+ dev_err(&rpdev->dev, "failed to create the ns ept\n");
+ return -ENOMEM;
+ }
+ rpdev->ept = ns_ept;
+
+ return 0;
+}
+
+static struct rpmsg_driver rpmsg_ns_driver = {
+ .drv.name = KBUILD_MODNAME,
+ .probe = rpmsg_ns_probe,
+};
+
+static int rpmsg_ns_init(void)
+{
+ int ret;
+
+ ret = register_rpmsg_driver(&rpmsg_ns_driver);
+ if (ret < 0)
+ pr_err("%s: Failed to register rpmsg driver\n", __func__);
+
+ return ret;
+}
+postcore_initcall(rpmsg_ns_init);
+
+static void rpmsg_ns_exit(void)
+{
+ unregister_rpmsg_driver(&rpmsg_ns_driver);
+}
+module_exit(rpmsg_ns_exit);
+
+MODULE_DESCRIPTION("Name service announcement rpmsg driver");
+MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
+MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);
+MODULE_LICENSE("GPL v2");
@@ -49,7 +49,6 @@
* @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
@@ -68,7 +67,6 @@ 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 */
@@ -815,69 +813,14 @@ 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;
- bool little_endian = virtio_is_little_endian(vrp->vdev);
- 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 = __rpmsg32_to_cpu(little_endian, msg->addr);
-
- dev_info(dev, "%sing channel %s addr 0x%x\n",
- __rpmsg32_to_cpu(little_endian, msg->flags) & RPMSG_NS_DESTROY ?
- "destroy" : "creat", msg->name, chinfo.dst);
-
- if (__rpmsg32_to_cpu(little_endian, 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;
@@ -953,14 +896,26 @@ 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->little_endian = virtio_is_little_endian(vrp->vdev);
+
+ rpdev_ns->dev.parent = &vrp->vdev->dev;
+ rpdev_ns->dev.release = virtio_rpmsg_release_device;
+
+ err = rpmsg_ns_register_device(rpdev_ns);
+ if (err)
+ goto free_coherent;
}
/*
@@ -985,6 +940,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
return 0;
free_coherent:
+ kfree(vch);
dma_free_coherent(vdev->dev.parent, total_buf_space,
bufs_va, vrp->bufs_dma);
vqs_del:
@@ -1013,9 +969,6 @@ 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);
@@ -4,6 +4,7 @@
#define _LINUX_RPMSG_NS_H
#include <linux/mod_devicetable.h>
+#include <linux/rpmsg.h>
#include <linux/rpmsg/byteorder.h>
#include <linux/types.h>
@@ -39,4 +40,6 @@ enum rpmsg_ns_flags {
/* Address 53 is reserved for advertising remote services */
#define RPMSG_NS_ADDR (53)
+int rpmsg_ns_register_device(struct rpmsg_device *rpdev);
+
#endif