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![Dan Williams](/assets/img/avatar_default.png)
This is disabled by default as the overhead is prohibitive, but if the user takes the action to turn it on we'll oblige. Reviewed-by: Vishal Verma <vishal.l.verma@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
465 lines
11 KiB
C
465 lines
11 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/blkdev.h>
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#include <linux/device.h>
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#include <linux/ctype.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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void nvdimm_bus_lock(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (!nvdimm_bus)
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return;
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mutex_lock(&nvdimm_bus->reconfig_mutex);
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}
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EXPORT_SYMBOL(nvdimm_bus_lock);
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void nvdimm_bus_unlock(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (!nvdimm_bus)
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return;
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mutex_unlock(&nvdimm_bus->reconfig_mutex);
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}
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EXPORT_SYMBOL(nvdimm_bus_unlock);
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bool is_nvdimm_bus_locked(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (!nvdimm_bus)
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return false;
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return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
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}
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EXPORT_SYMBOL(is_nvdimm_bus_locked);
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u64 nd_fletcher64(void *addr, size_t len, bool le)
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{
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u32 *buf = addr;
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u32 lo32 = 0;
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u64 hi32 = 0;
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int i;
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for (i = 0; i < len / sizeof(u32); i++) {
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lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
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hi32 += lo32;
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}
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return hi32 << 32 | lo32;
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}
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EXPORT_SYMBOL_GPL(nd_fletcher64);
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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 bool is_uuid_sep(char sep)
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{
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if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
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return true;
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return false;
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}
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static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
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size_t len)
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{
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const char *str = buf;
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u8 uuid[16];
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int i;
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for (i = 0; i < 16; i++) {
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if (!isxdigit(str[0]) || !isxdigit(str[1])) {
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dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
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__func__, i, str - buf, str[0],
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str + 1 - buf, str[1]);
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return -EINVAL;
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}
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uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
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str += 2;
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if (is_uuid_sep(*str))
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str++;
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}
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memcpy(uuid_out, uuid, sizeof(uuid));
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return 0;
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}
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/**
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* nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
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* @dev: container device for the uuid property
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* @uuid_out: uuid buffer to replace
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* @buf: raw sysfs buffer to parse
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*
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* Enforce that uuids can only be changed while the device is disabled
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* (driver detached)
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* LOCKING: expects device_lock() is held on entry
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*/
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int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
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size_t len)
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{
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u8 uuid[16];
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int rc;
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if (dev->driver)
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return -EBUSY;
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rc = nd_uuid_parse(dev, uuid, buf, len);
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if (rc)
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return rc;
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kfree(*uuid_out);
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*uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
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if (!(*uuid_out))
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return -ENOMEM;
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return 0;
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}
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ssize_t nd_sector_size_show(unsigned long current_lbasize,
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const unsigned long *supported, char *buf)
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{
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ssize_t len = 0;
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int i;
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for (i = 0; supported[i]; i++)
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if (current_lbasize == supported[i])
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len += sprintf(buf + len, "[%ld] ", supported[i]);
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else
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len += sprintf(buf + len, "%ld ", supported[i]);
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len += sprintf(buf + len, "\n");
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return len;
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}
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ssize_t nd_sector_size_store(struct device *dev, const char *buf,
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unsigned long *current_lbasize, const unsigned long *supported)
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{
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unsigned long lbasize;
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int rc, i;
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if (dev->driver)
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return -EBUSY;
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rc = kstrtoul(buf, 0, &lbasize);
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if (rc)
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return rc;
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for (i = 0; supported[i]; i++)
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if (lbasize == supported[i])
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break;
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if (supported[i]) {
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*current_lbasize = lbasize;
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return 0;
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} else {
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return -EINVAL;
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}
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}
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void __nd_iostat_start(struct bio *bio, unsigned long *start)
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{
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struct gendisk *disk = bio->bi_bdev->bd_disk;
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const int rw = bio_data_dir(bio);
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int cpu = part_stat_lock();
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*start = jiffies;
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part_round_stats(cpu, &disk->part0);
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part_stat_inc(cpu, &disk->part0, ios[rw]);
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part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio));
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part_inc_in_flight(&disk->part0, rw);
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part_stat_unlock();
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}
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EXPORT_SYMBOL(__nd_iostat_start);
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void nd_iostat_end(struct bio *bio, unsigned long start)
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{
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struct gendisk *disk = bio->bi_bdev->bd_disk;
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unsigned long duration = jiffies - start;
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const int rw = bio_data_dir(bio);
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int cpu = part_stat_lock();
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part_stat_add(cpu, &disk->part0, ticks[rw], duration);
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part_round_stats(cpu, &disk->part0);
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part_dec_in_flight(&disk->part0, rw);
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part_stat_unlock();
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}
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EXPORT_SYMBOL(nd_iostat_end);
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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, struct module *module)
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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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init_waitqueue_head(&nvdimm_bus->probe_wait);
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nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
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mutex_init(&nvdimm_bus->reconfig_mutex);
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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->module = module;
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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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#ifdef CONFIG_BLK_DEV_INTEGRITY
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static int nd_pi_nop_generate_verify(struct blk_integrity_iter *iter)
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{
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return 0;
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}
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int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
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{
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struct blk_integrity integrity = {
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.name = "ND-PI-NOP",
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.generate_fn = nd_pi_nop_generate_verify,
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.verify_fn = nd_pi_nop_generate_verify,
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.tuple_size = meta_size,
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.tag_size = meta_size,
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};
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int ret;
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if (meta_size == 0)
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return 0;
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ret = blk_integrity_register(disk, &integrity);
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if (ret)
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return ret;
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blk_queue_max_integrity_segments(disk->queue, 1);
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return 0;
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}
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EXPORT_SYMBOL(nd_integrity_init);
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
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{
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return 0;
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}
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EXPORT_SYMBOL(nd_integrity_init);
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#endif
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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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rc = nd_region_init();
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if (rc)
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goto err_region;
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return 0;
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err_region:
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nvdimm_exit();
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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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nd_region_exit();
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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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