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/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/libnvdimm.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-core.h"
LIST_HEAD(nvdimm_bus_list);
DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
static void nvdimm_bus_release(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus;
nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
ida_simple_remove(&nd_ida, nvdimm_bus->id);
kfree(nvdimm_bus);
}
struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus;
nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
WARN_ON(nvdimm_bus->dev.release != nvdimm_bus_release);
return nvdimm_bus;
}
EXPORT_SYMBOL_GPL(to_nvdimm_bus);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
{
/* struct nvdimm_bus definition is private to libnvdimm */
return nvdimm_bus->nd_desc;
}
EXPORT_SYMBOL_GPL(to_nd_desc);
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
{
struct device *dev;
for (dev = nd_dev; dev; dev = dev->parent)
if (dev->release == nvdimm_bus_release)
break;
dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
if (dev)
return to_nvdimm_bus(dev);
return NULL;
}
static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
{
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
struct device *parent = nvdimm_bus->dev.parent;
if (nd_desc->provider_name)
return nd_desc->provider_name;
else if (parent)
return dev_name(parent);
else
return "unknown";
}
static ssize_t provider_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
}
static DEVICE_ATTR_RO(provider);
static struct attribute *nvdimm_bus_attributes[] = {
&dev_attr_provider.attr,
NULL,
};
struct attribute_group nvdimm_bus_attribute_group = {
.attrs = nvdimm_bus_attributes,
};
EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nd_desc)
{
struct nvdimm_bus *nvdimm_bus;
int rc;
nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
if (!nvdimm_bus)
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
if (nvdimm_bus->id < 0) {
kfree(nvdimm_bus);
return NULL;
}
nvdimm_bus->nd_desc = nd_desc;
nvdimm_bus->dev.parent = parent;
nvdimm_bus->dev.release = nvdimm_bus_release;
nvdimm_bus->dev.groups = nd_desc->attr_groups;
dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
rc = device_register(&nvdimm_bus->dev);
if (rc) {
dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
goto err;
}
rc = nvdimm_bus_create_ndctl(nvdimm_bus);
if (rc)
goto err;
mutex_lock(&nvdimm_bus_list_mutex);
list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
mutex_unlock(&nvdimm_bus_list_mutex);
return nvdimm_bus;
err:
put_device(&nvdimm_bus->dev);
return NULL;
}
EXPORT_SYMBOL_GPL(nvdimm_bus_register);
static int child_unregister(struct device *dev, void *data)
{
/*
* the singular ndctl class device per bus needs to be
* "device_destroy"ed, so skip it here
*
* i.e. remove classless children
*/
if (dev->class)
/* pass */;
else
device_unregister(dev);
return 0;
}
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
{
if (!nvdimm_bus)
return;
mutex_lock(&nvdimm_bus_list_mutex);
list_del_init(&nvdimm_bus->list);
mutex_unlock(&nvdimm_bus_list_mutex);
device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
nvdimm_bus_destroy_ndctl(nvdimm_bus);
device_unregister(&nvdimm_bus->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
static __init int libnvdimm_init(void)
{
return nvdimm_bus_init();
}
static __exit void libnvdimm_exit(void)
{
WARN_ON(!list_empty(&nvdimm_bus_list));
nvdimm_bus_exit();
}
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
subsys_initcall(libnvdimm_init);
module_exit(libnvdimm_exit);
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