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![Dan Williams](/assets/img/avatar_default.png)
* Implement the device-model infrastructure for loading modules and attaching drivers to nvdimm devices. This is a simple association of a nd-device-type number with a driver that has a bitmask of supported device types. To facilitate userspace bind/unbind operations 'modalias' and 'devtype', that also appear in the uevent, are added as generic sysfs attributes for all nvdimm devices. The reason for the device-type number is to support sub-types within a given parent devtype, be it a vendor-specific sub-type or otherwise. * The first consumer of this infrastructure is the driver for dimm devices. It simply uses control messages to retrieve and store the configuration-data image (label set) from each dimm. Note: nd_device_register() arranges for asynchronous registration of nvdimm bus devices by default. Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Neil Brown <neilb@suse.de> Acked-by: Christoph Hellwig <hch@lst.de> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
237 lines
5.7 KiB
C
237 lines
5.7 KiB
C
/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/libnvdimm.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/ndctl.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include "nd-core.h"
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#include "nd.h"
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LIST_HEAD(nvdimm_bus_list);
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DEFINE_MUTEX(nvdimm_bus_list_mutex);
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static DEFINE_IDA(nd_ida);
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static void nvdimm_bus_release(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus;
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nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
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ida_simple_remove(&nd_ida, nvdimm_bus->id);
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kfree(nvdimm_bus);
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}
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struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus;
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nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
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WARN_ON(nvdimm_bus->dev.release != nvdimm_bus_release);
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return nvdimm_bus;
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}
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EXPORT_SYMBOL_GPL(to_nvdimm_bus);
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struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
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{
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/* struct nvdimm_bus definition is private to libnvdimm */
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return nvdimm_bus->nd_desc;
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}
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EXPORT_SYMBOL_GPL(to_nd_desc);
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struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
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{
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struct device *dev;
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for (dev = nd_dev; dev; dev = dev->parent)
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if (dev->release == nvdimm_bus_release)
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break;
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dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
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if (dev)
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return to_nvdimm_bus(dev);
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return NULL;
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}
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static ssize_t commands_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int cmd, len = 0;
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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for_each_set_bit(cmd, &nd_desc->dsm_mask, BITS_PER_LONG)
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len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
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len += sprintf(buf + len, "\n");
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return len;
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}
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static DEVICE_ATTR_RO(commands);
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static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
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{
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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struct device *parent = nvdimm_bus->dev.parent;
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if (nd_desc->provider_name)
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return nd_desc->provider_name;
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else if (parent)
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return dev_name(parent);
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else
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return "unknown";
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}
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static ssize_t provider_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
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}
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static DEVICE_ATTR_RO(provider);
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static int flush_namespaces(struct device *dev, void *data)
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{
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device_lock(dev);
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device_unlock(dev);
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return 0;
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}
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static int flush_regions_dimms(struct device *dev, void *data)
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{
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device_lock(dev);
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device_unlock(dev);
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device_for_each_child(dev, NULL, flush_namespaces);
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return 0;
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}
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static ssize_t wait_probe_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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nd_synchronize();
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device_for_each_child(dev, NULL, flush_regions_dimms);
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return sprintf(buf, "1\n");
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}
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static DEVICE_ATTR_RO(wait_probe);
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static struct attribute *nvdimm_bus_attributes[] = {
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&dev_attr_commands.attr,
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&dev_attr_wait_probe.attr,
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&dev_attr_provider.attr,
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NULL,
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};
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struct attribute_group nvdimm_bus_attribute_group = {
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.attrs = nvdimm_bus_attributes,
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};
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EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
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struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
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struct nvdimm_bus_descriptor *nd_desc)
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{
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struct nvdimm_bus *nvdimm_bus;
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int rc;
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nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
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if (!nvdimm_bus)
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return NULL;
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INIT_LIST_HEAD(&nvdimm_bus->list);
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nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
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if (nvdimm_bus->id < 0) {
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kfree(nvdimm_bus);
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return NULL;
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}
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nvdimm_bus->nd_desc = nd_desc;
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nvdimm_bus->dev.parent = parent;
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nvdimm_bus->dev.release = nvdimm_bus_release;
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nvdimm_bus->dev.groups = nd_desc->attr_groups;
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dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
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rc = device_register(&nvdimm_bus->dev);
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if (rc) {
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dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
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goto err;
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}
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rc = nvdimm_bus_create_ndctl(nvdimm_bus);
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if (rc)
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goto err;
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mutex_lock(&nvdimm_bus_list_mutex);
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list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
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mutex_unlock(&nvdimm_bus_list_mutex);
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return nvdimm_bus;
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err:
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put_device(&nvdimm_bus->dev);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(nvdimm_bus_register);
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static int child_unregister(struct device *dev, void *data)
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{
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/*
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* the singular ndctl class device per bus needs to be
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* "device_destroy"ed, so skip it here
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*
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* i.e. remove classless children
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*/
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if (dev->class)
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/* pass */;
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else
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nd_device_unregister(dev, ND_SYNC);
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return 0;
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}
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void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
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{
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if (!nvdimm_bus)
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return;
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mutex_lock(&nvdimm_bus_list_mutex);
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list_del_init(&nvdimm_bus->list);
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mutex_unlock(&nvdimm_bus_list_mutex);
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nd_synchronize();
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device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
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nvdimm_bus_destroy_ndctl(nvdimm_bus);
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device_unregister(&nvdimm_bus->dev);
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}
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EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
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static __init int libnvdimm_init(void)
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{
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int rc;
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rc = nvdimm_bus_init();
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if (rc)
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return rc;
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rc = nvdimm_init();
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if (rc)
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goto err_dimm;
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return 0;
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err_dimm:
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nvdimm_bus_exit();
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return rc;
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}
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static __exit void libnvdimm_exit(void)
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{
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WARN_ON(!list_empty(&nvdimm_bus_list));
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nvdimm_exit();
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nvdimm_bus_exit();
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}
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Intel Corporation");
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subsys_initcall(libnvdimm_init);
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module_exit(libnvdimm_exit);
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