@@ -316,6 +316,34 @@ static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
return 0;
}
+static ssize_t revision_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_bus *nd_bus = to_nd_bus(dev);
+ struct nd_bus_descriptor *nd_desc = to_nd_desc(nd_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+
+ return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision);
+}
+static DEVICE_ATTR_RO(revision);
+
+static struct attribute *acpi_nfit_attributes[] = {
+ &dev_attr_revision.attr,
+ NULL,
+};
+
+static struct attribute_group acpi_nfit_attribute_group = {
+ .name = "nfit",
+ .attrs = acpi_nfit_attributes,
+};
+
+const struct attribute_group *acpi_nfit_attribute_groups[] = {
+ &nd_bus_attribute_group,
+ &acpi_nfit_attribute_group,
+ NULL,
+};
+EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
+
static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
@@ -372,6 +400,7 @@ static int acpi_nfit_add(struct acpi_device *adev)
nd_desc = &acpi_desc->nd_desc;
nd_desc->provider_name = "ACPI.NFIT";
nd_desc->ndctl = acpi_nfit_ctl;
+ nd_desc->attr_groups = acpi_nfit_attribute_groups;
acpi_desc->nd_bus = nd_bus_register(dev, nd_desc);
if (!acpi_desc->nd_bus)
@@ -86,4 +86,9 @@ static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfi
return nfit_mem->memdev_dcr;
return nfit_mem->memdev_pmem;
}
+
+static inline struct acpi_nfit_desc *to_acpi_desc(struct nd_bus_descriptor *nd_desc)
+{
+ return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
+}
#endif /* __NFIT_H__ */
@@ -1,3 +1,4 @@
obj-$(CONFIG_LIBND) += libnd.o
libnd-y := core.o
+libnd-y += bus.o
new file mode 100644
@@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include "nd-private.h"
+
+static int nd_bus_major;
+static struct class *nd_class;
+
+int nd_bus_create_ndctl(struct nd_bus *nd_bus)
+{
+ dev_t devt = MKDEV(nd_bus_major, nd_bus->id);
+ struct device *dev;
+
+ dev = device_create(nd_class, &nd_bus->dev, devt, nd_bus, "ndctl%d",
+ nd_bus->id);
+
+ if (IS_ERR(dev)) {
+ dev_dbg(&nd_bus->dev, "failed to register ndctl%d: %ld\n",
+ nd_bus->id, PTR_ERR(dev));
+ return PTR_ERR(dev);
+ }
+ return 0;
+}
+
+void nd_bus_destroy_ndctl(struct nd_bus *nd_bus)
+{
+ device_destroy(nd_class, MKDEV(nd_bus_major, nd_bus->id));
+}
+
+static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return -ENXIO;
+}
+
+static const struct file_operations nd_bus_fops = {
+ .owner = THIS_MODULE,
+ .open = nonseekable_open,
+ .unlocked_ioctl = nd_ioctl,
+ .compat_ioctl = nd_ioctl,
+ .llseek = noop_llseek,
+};
+
+int __init nd_bus_init(void)
+{
+ int rc;
+
+ rc = register_chrdev(0, "ndctl", &nd_bus_fops);
+ if (rc < 0)
+ return rc;
+ nd_bus_major = rc;
+
+ nd_class = class_create(THIS_MODULE, "nd");
+ if (IS_ERR(nd_class))
+ goto err_class;
+
+ return 0;
+
+ err_class:
+ unregister_chrdev(nd_bus_major, "ndctl");
+
+ return rc;
+}
+
+void __exit nd_bus_exit(void)
+{
+ class_destroy(nd_class);
+ unregister_chrdev(nd_bus_major, "ndctl");
+}
@@ -14,9 +14,12 @@
#include <linux/module.h>
#include <linux/device.h>
#include <linux/libnd.h>
+#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-private.h"
+LIST_HEAD(nd_bus_list);
+DEFINE_MUTEX(nd_bus_list_mutex);
static DEFINE_IDA(nd_ida);
static void nd_bus_release(struct device *dev)
@@ -27,6 +30,54 @@ static void nd_bus_release(struct device *dev)
kfree(nd_bus);
}
+struct nd_bus *to_nd_bus(struct device *dev)
+{
+ struct nd_bus *nd_bus = container_of(dev, struct nd_bus, dev);
+
+ WARN_ON(nd_bus->dev.release != nd_bus_release);
+ return nd_bus;
+}
+EXPORT_SYMBOL_GPL(to_nd_bus);
+
+struct nd_bus_descriptor *to_nd_desc(struct nd_bus *nd_bus)
+{
+ /* struct nd_bus definition is private to libnd */
+ return nd_bus->nd_desc;
+}
+EXPORT_SYMBOL_GPL(to_nd_desc);
+
+static const char *nd_bus_provider(struct nd_bus *nd_bus)
+{
+ struct nd_bus_descriptor *nd_desc = nd_bus->nd_desc;
+ struct device *parent = nd_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 nd_bus *nd_bus = to_nd_bus(dev);
+
+ return sprintf(buf, "%s\n", nd_bus_provider(nd_bus));
+}
+static DEVICE_ATTR_RO(provider);
+
+static struct attribute *nd_bus_attributes[] = {
+ &dev_attr_provider.attr,
+ NULL,
+};
+
+struct attribute_group nd_bus_attribute_group = {
+ .attrs = nd_bus_attributes,
+};
+EXPORT_SYMBOL_GPL(nd_bus_attribute_group);
+
struct nd_bus *nd_bus_register(struct device *parent,
struct nd_bus_descriptor *nd_desc)
{
@@ -35,6 +86,7 @@ struct nd_bus *nd_bus_register(struct device *parent,
if (!nd_bus)
return NULL;
+ INIT_LIST_HEAD(&nd_bus->list);
nd_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
if (nd_bus->id < 0) {
kfree(nd_bus);
@@ -43,15 +95,26 @@ struct nd_bus *nd_bus_register(struct device *parent,
nd_bus->nd_desc = nd_desc;
nd_bus->dev.parent = parent;
nd_bus->dev.release = nd_bus_release;
+ nd_bus->dev.groups = nd_desc->attr_groups;
dev_set_name(&nd_bus->dev, "ndbus%d", nd_bus->id);
rc = device_register(&nd_bus->dev);
if (rc) {
dev_dbg(&nd_bus->dev, "device registration failed: %d\n", rc);
- put_device(&nd_bus->dev);
- return NULL;
+ goto err;
}
+ rc = nd_bus_create_ndctl(nd_bus);
+ if (rc)
+ goto err;
+
+ mutex_lock(&nd_bus_list_mutex);
+ list_add_tail(&nd_bus->list, &nd_bus_list);
+ mutex_unlock(&nd_bus_list_mutex);
+
return nd_bus;
+ err:
+ put_device(&nd_bus->dev);
+ return NULL;
}
EXPORT_SYMBOL_GPL(nd_bus_register);
@@ -59,9 +122,29 @@ void nd_bus_unregister(struct nd_bus *nd_bus)
{
if (!nd_bus)
return;
+
+ mutex_lock(&nd_bus_list_mutex);
+ list_del_init(&nd_bus->list);
+ mutex_unlock(&nd_bus_list_mutex);
+
+ nd_bus_destroy_ndctl(nd_bus);
+
device_unregister(&nd_bus->dev);
}
EXPORT_SYMBOL_GPL(nd_bus_unregister);
+static __init int libnd_init(void)
+{
+ return nd_bus_init();
+}
+
+static __exit void libnd_exit(void)
+{
+ WARN_ON(!list_empty(&nd_bus_list));
+ nd_bus_exit();
+}
+
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
+module_init(libnd_init);
+module_exit(libnd_exit);
@@ -17,7 +17,13 @@
struct nd_bus {
struct nd_bus_descriptor *nd_desc;
+ struct list_head list;
struct device dev;
int id;
};
+
+int __init nd_bus_init(void);
+void __exit nd_bus_exit(void);
+int nd_bus_create_ndctl(struct nd_bus *nd_bus);
+void nd_bus_destroy_ndctl(struct nd_bus *nd_bus);
#endif /* __ND_PRIVATE_H__ */
@@ -14,6 +14,8 @@
*/
#ifndef __LIBND_H__
#define __LIBND_H__
+extern struct attribute_group nd_bus_attribute_group;
+
struct nd_dimm;
struct nd_bus_descriptor;
typedef int (*ndctl_fn)(struct nd_bus_descriptor *nd_desc,
@@ -21,6 +23,7 @@ typedef int (*ndctl_fn)(struct nd_bus_descriptor *nd_desc,
unsigned int buf_len);
struct nd_bus_descriptor {
+ const struct attribute_group **attr_groups;
unsigned long dsm_mask;
char *provider_name;
ndctl_fn ndctl;
@@ -31,4 +34,6 @@ struct device;
struct nd_bus *nd_bus_register(struct device *parent,
struct nd_bus_descriptor *nfit_desc);
void nd_bus_unregister(struct nd_bus *nd_bus);
+struct nd_bus *to_nd_bus(struct device *dev);
+struct nd_bus_descriptor *to_nd_desc(struct nd_bus *nd_bus);
#endif /* __LIBND_H__ */
The control device for a libnd 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> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/acpi/nfit.c | 29 ++++++++++++++ drivers/acpi/nfit.h | 5 ++ drivers/block/nd/Makefile | 1 drivers/block/nd/bus.c | 83 +++++++++++++++++++++++++++++++++++++++ drivers/block/nd/core.c | 87 ++++++++++++++++++++++++++++++++++++++++- drivers/block/nd/nd-private.h | 6 +++ include/linux/libnd.h | 5 ++ 7 files changed, 214 insertions(+), 2 deletions(-) create mode 100644 drivers/block/nd/bus.c