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https://mirrors.bfsu.edu.cn/git/linux.git
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rpmsg: Split rpmsg core and virtio backend
Extract the generic rpmsg core functionality from the virtio rpmsg implementation, splitting the implementation in a rpmsg core and a virtio backend. Based on initial work by Sricharan R <sricharan@codeaurora.org> Cc: Sricharan R <sricharan@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson
parent
6eed598a04
commit
5e619b4867
@ -262,3 +262,234 @@ struct device *rpmsg_find_device(struct device *parent,
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}
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EXPORT_SYMBOL(rpmsg_find_device);
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/* sysfs show configuration fields */
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#define rpmsg_show_attr(field, path, format_string) \
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static ssize_t \
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field##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); \
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\
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return sprintf(buf, format_string, rpdev->path); \
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}
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/* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */
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rpmsg_show_attr(name, id.name, "%s\n");
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rpmsg_show_attr(src, src, "0x%x\n");
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rpmsg_show_attr(dst, dst, "0x%x\n");
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rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n");
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name);
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}
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static struct device_attribute rpmsg_dev_attrs[] = {
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__ATTR_RO(name),
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__ATTR_RO(modalias),
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__ATTR_RO(dst),
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__ATTR_RO(src),
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__ATTR_RO(announce),
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__ATTR_NULL
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};
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/* rpmsg devices and drivers are matched using the service name */
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static inline int rpmsg_id_match(const struct rpmsg_device *rpdev,
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const struct rpmsg_device_id *id)
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{
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return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
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}
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/* match rpmsg channel and rpmsg driver */
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static int rpmsg_dev_match(struct device *dev, struct device_driver *drv)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv);
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const struct rpmsg_device_id *ids = rpdrv->id_table;
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unsigned int i;
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if (ids)
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for (i = 0; ids[i].name[0]; i++)
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if (rpmsg_id_match(rpdev, &ids[i]))
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return 1;
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return of_driver_match_device(dev, drv);
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}
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static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT,
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rpdev->id.name);
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}
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/*
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* when an rpmsg driver is probed with a channel, we seamlessly create
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* it an endpoint, binding its rx callback to a unique local rpmsg
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* address.
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*
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* if we need to, we also announce about this channel to the remote
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* processor (needed in case the driver is exposing an rpmsg service).
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*/
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static int rpmsg_dev_probe(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
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struct rpmsg_channel_info chinfo = {};
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struct rpmsg_endpoint *ept;
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int err;
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strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
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chinfo.src = rpdev->src;
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chinfo.dst = RPMSG_ADDR_ANY;
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ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo);
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if (!ept) {
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dev_err(dev, "failed to create endpoint\n");
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err = -ENOMEM;
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goto out;
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}
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rpdev->ept = ept;
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rpdev->src = ept->addr;
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err = rpdrv->probe(rpdev);
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if (err) {
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dev_err(dev, "%s: failed: %d\n", __func__, err);
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rpmsg_destroy_ept(ept);
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goto out;
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}
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if (rpdev->ops->announce_create)
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err = rpdev->ops->announce_create(rpdev);
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out:
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return err;
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}
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static int rpmsg_dev_remove(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
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int err = 0;
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if (rpdev->ops->announce_destroy)
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err = rpdev->ops->announce_destroy(rpdev);
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rpdrv->remove(rpdev);
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rpmsg_destroy_ept(rpdev->ept);
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return err;
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}
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static struct bus_type rpmsg_bus = {
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.name = "rpmsg",
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.match = rpmsg_dev_match,
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.dev_attrs = rpmsg_dev_attrs,
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.uevent = rpmsg_uevent,
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.probe = rpmsg_dev_probe,
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.remove = rpmsg_dev_remove,
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};
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static void rpmsg_release_device(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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kfree(rpdev);
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}
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int rpmsg_register_device(struct rpmsg_device *rpdev)
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{
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struct device *dev = &rpdev->dev;
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int ret;
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dev_set_name(&rpdev->dev, "%s:%s",
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dev_name(dev->parent), rpdev->id.name);
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rpdev->dev.bus = &rpmsg_bus;
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rpdev->dev.release = rpmsg_release_device;
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ret = device_register(&rpdev->dev);
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if (ret) {
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dev_err(dev, "device_register failed: %d\n", ret);
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put_device(&rpdev->dev);
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}
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return ret;
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}
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EXPORT_SYMBOL(rpmsg_register_device);
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/*
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* find an existing channel using its name + address properties,
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* and destroy it
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*/
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int rpmsg_unregister_device(struct device *parent,
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struct rpmsg_channel_info *chinfo)
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{
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struct device *dev;
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dev = rpmsg_find_device(parent, chinfo);
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if (!dev)
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return -EINVAL;
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device_unregister(dev);
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put_device(dev);
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return 0;
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}
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EXPORT_SYMBOL(rpmsg_unregister_device);
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/**
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* __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus
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* @rpdrv: pointer to a struct rpmsg_driver
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* @owner: owning module/driver
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*
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* Returns 0 on success, and an appropriate error value on failure.
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*/
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int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner)
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{
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rpdrv->drv.bus = &rpmsg_bus;
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rpdrv->drv.owner = owner;
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return driver_register(&rpdrv->drv);
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}
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EXPORT_SYMBOL(__register_rpmsg_driver);
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/**
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* unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus
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* @rpdrv: pointer to a struct rpmsg_driver
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*
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* Returns 0 on success, and an appropriate error value on failure.
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*/
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void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv)
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{
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driver_unregister(&rpdrv->drv);
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}
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EXPORT_SYMBOL(unregister_rpmsg_driver);
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static int __init rpmsg_init(void)
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{
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int ret;
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ret = bus_register(&rpmsg_bus);
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if (ret)
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pr_err("failed to register rpmsg bus: %d\n", ret);
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return ret;
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}
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postcore_initcall(rpmsg_init);
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static void __exit rpmsg_fini(void)
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{
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bus_unregister(&rpmsg_bus);
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}
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module_exit(rpmsg_fini);
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MODULE_DESCRIPTION("remote processor messaging bus");
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MODULE_LICENSE("GPL v2");
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@ -25,6 +25,10 @@
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#define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
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#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
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int rpmsg_register_device(struct rpmsg_device *rpdev);
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int rpmsg_unregister_device(struct device *parent,
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struct rpmsg_channel_info *chinfo);
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struct device *rpmsg_find_device(struct device *parent,
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struct rpmsg_channel_info *chinfo);
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@ -75,9 +75,6 @@ struct virtproc_info {
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struct rpmsg_endpoint *ns_ept;
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};
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#define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
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#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
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/*
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* We're allocating buffers of 512 bytes each for communications. The
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* number of buffers will be computed from the number of buffers supported
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@ -120,72 +117,6 @@ static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
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int len, u32 dst);
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static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
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u32 dst, void *data, int len);
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static int rpmsg_register_device(struct rpmsg_device *rpdev);
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/* sysfs show configuration fields */
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#define rpmsg_show_attr(field, path, format_string) \
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static ssize_t \
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field##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); \
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\
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return sprintf(buf, format_string, rpdev->path); \
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}
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/* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */
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rpmsg_show_attr(name, id.name, "%s\n");
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rpmsg_show_attr(src, src, "0x%x\n");
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rpmsg_show_attr(dst, dst, "0x%x\n");
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rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n");
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name);
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}
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static struct device_attribute rpmsg_dev_attrs[] = {
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__ATTR_RO(name),
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__ATTR_RO(modalias),
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__ATTR_RO(dst),
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__ATTR_RO(src),
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__ATTR_RO(announce),
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__ATTR_NULL
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};
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/* rpmsg devices and drivers are matched using the service name */
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static inline int rpmsg_id_match(const struct rpmsg_device *rpdev,
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const struct rpmsg_device_id *id)
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{
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return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
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}
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/* match rpmsg channel and rpmsg driver */
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static int rpmsg_dev_match(struct device *dev, struct device_driver *drv)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv);
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const struct rpmsg_device_id *ids = rpdrv->id_table;
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unsigned int i;
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if (ids)
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for (i = 0; ids[i].name[0]; i++)
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if (rpmsg_id_match(rpdev, &ids[i]))
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return 1;
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return of_driver_match_device(dev, drv);
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}
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static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT,
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rpdev->id.name);
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}
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static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
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.destroy_ept = virtio_rpmsg_destroy_ept,
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@ -307,49 +238,6 @@ static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
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__rpmsg_destroy_ept(ept->rpdev->vrp, ept);
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}
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/*
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* when an rpmsg driver is probed with a channel, we seamlessly create
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* it an endpoint, binding its rx callback to a unique local rpmsg
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* address.
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*
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* if we need to, we also announce about this channel to the remote
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* processor (needed in case the driver is exposing an rpmsg service).
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*/
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static int rpmsg_dev_probe(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
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struct rpmsg_channel_info chinfo = {};
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struct rpmsg_endpoint *ept;
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int err;
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strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
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chinfo.src = rpdev->src;
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chinfo.dst = RPMSG_ADDR_ANY;
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ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo);
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if (!ept) {
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dev_err(dev, "failed to create endpoint\n");
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err = -ENOMEM;
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goto out;
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}
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rpdev->ept = ept;
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rpdev->src = ept->addr;
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err = rpdrv->probe(rpdev);
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if (err) {
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dev_err(dev, "%s: failed: %d\n", __func__, err);
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rpmsg_destroy_ept(ept);
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goto out;
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}
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if (rpdev->ops->announce_create)
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err = rpdev->ops->announce_create(rpdev);
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out:
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return err;
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}
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static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev)
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{
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struct virtproc_info *vrp = rpdev->vrp;
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@ -396,65 +284,6 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
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return err;
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}
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static int rpmsg_dev_remove(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
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int err = 0;
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if (rpdev->ops->announce_destroy)
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err = rpdev->ops->announce_destroy(rpdev);
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rpdrv->remove(rpdev);
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rpmsg_destroy_ept(rpdev->ept);
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return err;
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}
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static struct bus_type rpmsg_bus = {
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.name = "rpmsg",
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.match = rpmsg_dev_match,
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.dev_attrs = rpmsg_dev_attrs,
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.uevent = rpmsg_uevent,
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.probe = rpmsg_dev_probe,
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.remove = rpmsg_dev_remove,
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};
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/**
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* __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus
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* @rpdrv: pointer to a struct rpmsg_driver
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* @owner: owning module/driver
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*
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* Returns 0 on success, and an appropriate error value on failure.
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*/
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int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner)
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{
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rpdrv->drv.bus = &rpmsg_bus;
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rpdrv->drv.owner = owner;
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return driver_register(&rpdrv->drv);
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}
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EXPORT_SYMBOL(__register_rpmsg_driver);
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/**
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* unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus
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* @rpdrv: pointer to a struct rpmsg_driver
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*
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* Returns 0 on success, and an appropriate error value on failure.
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*/
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void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv)
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{
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driver_unregister(&rpdrv->drv);
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}
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EXPORT_SYMBOL(unregister_rpmsg_driver);
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static void rpmsg_release_device(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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kfree(rpdev);
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}
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static const struct rpmsg_device_ops virtio_rpmsg_ops = {
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.create_ept = virtio_rpmsg_create_ept,
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.announce_create = virtio_rpmsg_announce_create,
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@ -508,47 +337,6 @@ static struct rpmsg_device *rpmsg_create_channel(struct virtproc_info *vrp,
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return rpdev;
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}
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static int rpmsg_register_device(struct rpmsg_device *rpdev)
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{
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struct device *dev = &rpdev->dev;
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int ret;
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dev_set_name(&rpdev->dev, "%s:%s",
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dev_name(dev->parent), rpdev->id.name);
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rpdev->dev.bus = &rpmsg_bus;
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rpdev->dev.release = rpmsg_release_device;
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|
||||
ret = device_register(&rpdev->dev);
|
||||
if (ret) {
|
||||
dev_err(dev, "device_register failed: %d\n", ret);
|
||||
put_device(&rpdev->dev);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* find an existing channel using its name + address properties,
|
||||
* and destroy it
|
||||
*/
|
||||
static int rpmsg_destroy_channel(struct virtproc_info *vrp,
|
||||
struct rpmsg_channel_info *chinfo)
|
||||
{
|
||||
struct virtio_device *vdev = vrp->vdev;
|
||||
struct device *dev;
|
||||
|
||||
dev = rpmsg_find_device(&vdev->dev, chinfo);
|
||||
if (!dev)
|
||||
return -EINVAL;
|
||||
|
||||
device_unregister(dev);
|
||||
|
||||
put_device(dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* super simple buffer "allocator" that is just enough for now */
|
||||
static void *get_a_tx_buf(struct virtproc_info *vrp)
|
||||
{
|
||||
@ -967,7 +755,7 @@ static void rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
|
||||
chinfo.dst = msg->addr;
|
||||
|
||||
if (msg->flags & RPMSG_NS_DESTROY) {
|
||||
ret = rpmsg_destroy_channel(vrp, &chinfo);
|
||||
ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo);
|
||||
if (ret)
|
||||
dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
|
||||
} else {
|
||||
@ -1152,17 +940,9 @@ static int __init rpmsg_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = bus_register(&rpmsg_bus);
|
||||
if (ret) {
|
||||
pr_err("failed to register rpmsg bus: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = register_virtio_driver(&virtio_ipc_driver);
|
||||
if (ret) {
|
||||
if (ret)
|
||||
pr_err("failed to register virtio driver: %d\n", ret);
|
||||
bus_unregister(&rpmsg_bus);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
@ -1171,7 +951,6 @@ subsys_initcall(rpmsg_init);
|
||||
static void __exit rpmsg_fini(void)
|
||||
{
|
||||
unregister_virtio_driver(&virtio_ipc_driver);
|
||||
bus_unregister(&rpmsg_bus);
|
||||
}
|
||||
module_exit(rpmsg_fini);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user