linux/drivers/nvdimm/core.c

466 lines
11 KiB
C

/*
* 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/blkdev.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/ndctl.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-core.h"
#include "nd.h"
LIST_HEAD(nvdimm_bus_list);
DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
void nvdimm_bus_lock(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!nvdimm_bus)
return;
mutex_lock(&nvdimm_bus->reconfig_mutex);
}
EXPORT_SYMBOL(nvdimm_bus_lock);
void nvdimm_bus_unlock(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!nvdimm_bus)
return;
mutex_unlock(&nvdimm_bus->reconfig_mutex);
}
EXPORT_SYMBOL(nvdimm_bus_unlock);
bool is_nvdimm_bus_locked(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!nvdimm_bus)
return false;
return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
}
EXPORT_SYMBOL(is_nvdimm_bus_locked);
u64 nd_fletcher64(void *addr, size_t len, bool le)
{
u32 *buf = addr;
u32 lo32 = 0;
u64 hi32 = 0;
int i;
for (i = 0; i < len / sizeof(u32); i++) {
lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
hi32 += lo32;
}
return hi32 << 32 | lo32;
}
EXPORT_SYMBOL_GPL(nd_fletcher64);
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 bool is_uuid_sep(char sep)
{
if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
return true;
return false;
}
static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
size_t len)
{
const char *str = buf;
u8 uuid[16];
int i;
for (i = 0; i < 16; i++) {
if (!isxdigit(str[0]) || !isxdigit(str[1])) {
dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
__func__, i, str - buf, str[0],
str + 1 - buf, str[1]);
return -EINVAL;
}
uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
str += 2;
if (is_uuid_sep(*str))
str++;
}
memcpy(uuid_out, uuid, sizeof(uuid));
return 0;
}
/**
* nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
* @dev: container device for the uuid property
* @uuid_out: uuid buffer to replace
* @buf: raw sysfs buffer to parse
*
* Enforce that uuids can only be changed while the device is disabled
* (driver detached)
* LOCKING: expects device_lock() is held on entry
*/
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
size_t len)
{
u8 uuid[16];
int rc;
if (dev->driver)
return -EBUSY;
rc = nd_uuid_parse(dev, uuid, buf, len);
if (rc)
return rc;
kfree(*uuid_out);
*uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
if (!(*uuid_out))
return -ENOMEM;
return 0;
}
ssize_t nd_sector_size_show(unsigned long current_lbasize,
const unsigned long *supported, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; supported[i]; i++)
if (current_lbasize == supported[i])
len += sprintf(buf + len, "[%ld] ", supported[i]);
else
len += sprintf(buf + len, "%ld ", supported[i]);
len += sprintf(buf + len, "\n");
return len;
}
ssize_t nd_sector_size_store(struct device *dev, const char *buf,
unsigned long *current_lbasize, const unsigned long *supported)
{
unsigned long lbasize;
int rc, i;
if (dev->driver)
return -EBUSY;
rc = kstrtoul(buf, 0, &lbasize);
if (rc)
return rc;
for (i = 0; supported[i]; i++)
if (lbasize == supported[i])
break;
if (supported[i]) {
*current_lbasize = lbasize;
return 0;
} else {
return -EINVAL;
}
}
void __nd_iostat_start(struct bio *bio, unsigned long *start)
{
struct gendisk *disk = bio->bi_bdev->bd_disk;
const int rw = bio_data_dir(bio);
int cpu = part_stat_lock();
*start = jiffies;
part_round_stats(cpu, &disk->part0);
part_stat_inc(cpu, &disk->part0, ios[rw]);
part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio));
part_inc_in_flight(&disk->part0, rw);
part_stat_unlock();
}
EXPORT_SYMBOL(__nd_iostat_start);
void nd_iostat_end(struct bio *bio, unsigned long start)
{
struct gendisk *disk = bio->bi_bdev->bd_disk;
unsigned long duration = jiffies - start;
const int rw = bio_data_dir(bio);
int cpu = part_stat_lock();
part_stat_add(cpu, &disk->part0, ticks[rw], duration);
part_round_stats(cpu, &disk->part0);
part_dec_in_flight(&disk->part0, rw);
part_stat_unlock();
}
EXPORT_SYMBOL(nd_iostat_end);
static ssize_t commands_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int cmd, len = 0;
struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
for_each_set_bit(cmd, &nd_desc->dsm_mask, BITS_PER_LONG)
len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
len += sprintf(buf + len, "\n");
return len;
}
static DEVICE_ATTR_RO(commands);
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 int flush_namespaces(struct device *dev, void *data)
{
device_lock(dev);
device_unlock(dev);
return 0;
}
static int flush_regions_dimms(struct device *dev, void *data)
{
device_lock(dev);
device_unlock(dev);
device_for_each_child(dev, NULL, flush_namespaces);
return 0;
}
static ssize_t wait_probe_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
nd_synchronize();
device_for_each_child(dev, NULL, flush_regions_dimms);
return sprintf(buf, "1\n");
}
static DEVICE_ATTR_RO(wait_probe);
static struct attribute *nvdimm_bus_attributes[] = {
&dev_attr_commands.attr,
&dev_attr_wait_probe.attr,
&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 module *module)
{
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);
init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
mutex_init(&nvdimm_bus->reconfig_mutex);
if (nvdimm_bus->id < 0) {
kfree(nvdimm_bus);
return NULL;
}
nvdimm_bus->nd_desc = nd_desc;
nvdimm_bus->module = module;
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
nd_device_unregister(dev, ND_SYNC);
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);
nd_synchronize();
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);
#ifdef CONFIG_BLK_DEV_INTEGRITY
static int nd_pi_nop_generate_verify(struct blk_integrity_iter *iter)
{
return 0;
}
int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
{
struct blk_integrity integrity = {
.name = "ND-PI-NOP",
.generate_fn = nd_pi_nop_generate_verify,
.verify_fn = nd_pi_nop_generate_verify,
.tuple_size = meta_size,
.tag_size = meta_size,
};
int ret;
if (meta_size == 0)
return 0;
ret = blk_integrity_register(disk, &integrity);
if (ret)
return ret;
blk_queue_max_integrity_segments(disk->queue, 1);
return 0;
}
EXPORT_SYMBOL(nd_integrity_init);
#else /* CONFIG_BLK_DEV_INTEGRITY */
int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
{
return 0;
}
EXPORT_SYMBOL(nd_integrity_init);
#endif
static __init int libnvdimm_init(void)
{
int rc;
rc = nvdimm_bus_init();
if (rc)
return rc;
rc = nvdimm_init();
if (rc)
goto err_dimm;
rc = nd_region_init();
if (rc)
goto err_region;
return 0;
err_region:
nvdimm_exit();
err_dimm:
nvdimm_bus_exit();
return rc;
}
static __exit void libnvdimm_exit(void)
{
WARN_ON(!list_empty(&nvdimm_bus_list));
nd_region_exit();
nvdimm_exit();
nvdimm_bus_exit();
}
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
subsys_initcall(libnvdimm_init);
module_exit(libnvdimm_exit);