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authorDan Williams <dan.j.williams@intel.com>2015-04-27 02:26:48 +0300
committerDan Williams <dan.j.williams@intel.com>2015-06-25 04:24:10 +0300
commit45def22c1fab85764646746ce38d45b2f3281fa5 (patch)
tree05a417ff9c0540728bb29be48fe999a3f04ec79d /drivers/nvdimm/core.c
parentb94d5230d06eb930be82e67fb1a9a58271e78297 (diff)
downloadlinux-45def22c1fab85764646746ce38d45b2f3281fa5.tar.xz
libnvdimm: control character device and nvdimm_bus sysfs attributes
The control device for a nvdimm_bus is registered as an "nd" class device. The expectation is that there will usually only be one "nd" bus registered under /sys/class/nd. However, we allow for the possibility of multiple buses and they will listed in discovery order as ndctl0...ndctlN. This character device hosts the ioctl for passing control messages. The initial command set has a 1:1 correlation with the commands listed in the by the "NFIT DSM Example" document [1], but this scheme is extensible to future command sets. Note, nd_ioctl() and the backing ->ndctl() implementation are defined in a subsequent patch. This is simply the initial registrations and sysfs attributes. [1]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf Cc: Neil Brown <neilb@suse.de> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: <linux-acpi@vger.kernel.org> Cc: Robert Moore <robert.moore@intel.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/core.c')
-rw-r--r--drivers/nvdimm/core.c88
1 files changed, 86 insertions, 2 deletions
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index c578a49867ac..fa7ab5ad0318 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -14,9 +14,12 @@
#include <linux/export.h>
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-core.h"
+static LIST_HEAD(nvdimm_bus_list);
+static DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
static void nvdimm_bus_release(struct device *dev)
@@ -28,6 +31,55 @@ static void nvdimm_bus_release(struct device *dev)
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);
+
+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)
{
@@ -37,6 +89,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
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);
@@ -45,15 +98,26 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
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);
- put_device(&nvdimm_bus->dev);
- return NULL;
+ 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);
@@ -61,9 +125,29 @@ 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);
+
+ 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);