426 lines
10 KiB
C
426 lines
10 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/blkdev.h>
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#include <linux/device.h>
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#include <linux/genhd.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include "nd-core.h"
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#include "btt.h"
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#include "nd.h"
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static void __nd_btt_detach_ndns(struct nd_btt *nd_btt)
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{
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struct nd_namespace_common *ndns = nd_btt->ndns;
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dev_WARN_ONCE(&nd_btt->dev, !mutex_is_locked(&ndns->dev.mutex)
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|| ndns->claim != &nd_btt->dev,
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"%s: invalid claim\n", __func__);
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ndns->claim = NULL;
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nd_btt->ndns = NULL;
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put_device(&ndns->dev);
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}
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static void nd_btt_detach_ndns(struct nd_btt *nd_btt)
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{
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struct nd_namespace_common *ndns = nd_btt->ndns;
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if (!ndns)
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return;
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get_device(&ndns->dev);
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device_lock(&ndns->dev);
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__nd_btt_detach_ndns(nd_btt);
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device_unlock(&ndns->dev);
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put_device(&ndns->dev);
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}
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static bool __nd_btt_attach_ndns(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns)
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{
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if (ndns->claim)
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return false;
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dev_WARN_ONCE(&nd_btt->dev, !mutex_is_locked(&ndns->dev.mutex)
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|| nd_btt->ndns,
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"%s: invalid claim\n", __func__);
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ndns->claim = &nd_btt->dev;
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nd_btt->ndns = ndns;
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get_device(&ndns->dev);
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return true;
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}
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static bool nd_btt_attach_ndns(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns)
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{
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bool claimed;
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device_lock(&ndns->dev);
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claimed = __nd_btt_attach_ndns(nd_btt, ndns);
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device_unlock(&ndns->dev);
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return claimed;
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}
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static void nd_btt_release(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_btt *nd_btt = to_nd_btt(dev);
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dev_dbg(dev, "%s\n", __func__);
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nd_btt_detach_ndns(nd_btt);
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ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
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kfree(nd_btt->uuid);
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kfree(nd_btt);
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}
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static struct device_type nd_btt_device_type = {
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.name = "nd_btt",
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.release = nd_btt_release,
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};
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bool is_nd_btt(struct device *dev)
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{
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return dev->type == &nd_btt_device_type;
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}
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EXPORT_SYMBOL(is_nd_btt);
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struct nd_btt *to_nd_btt(struct device *dev)
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{
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struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
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WARN_ON(!is_nd_btt(dev));
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return nd_btt;
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}
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EXPORT_SYMBOL(to_nd_btt);
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static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
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4096, 4104, 4160, 4224, 0 };
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static ssize_t sector_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf);
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}
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static ssize_t sector_size_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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device_lock(dev);
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nvdimm_bus_lock(dev);
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rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize,
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btt_lbasize_supported);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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nvdimm_bus_unlock(dev);
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device_unlock(dev);
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return rc ? rc : len;
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}
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static DEVICE_ATTR_RW(sector_size);
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static ssize_t uuid_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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if (nd_btt->uuid)
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return sprintf(buf, "%pUb\n", nd_btt->uuid);
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return sprintf(buf, "\n");
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}
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static ssize_t uuid_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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device_lock(dev);
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rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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device_unlock(dev);
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return rc ? rc : len;
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}
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static DEVICE_ATTR_RW(uuid);
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static ssize_t namespace_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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rc = sprintf(buf, "%s\n", nd_btt->ndns
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? dev_name(&nd_btt->ndns->dev) : "");
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static int namespace_match(struct device *dev, void *data)
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{
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char *name = data;
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return strcmp(name, dev_name(dev)) == 0;
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}
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static bool is_nd_btt_idle(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_btt *nd_btt = to_nd_btt(dev);
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if (nd_region->btt_seed == dev || nd_btt->ndns || dev->driver)
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return false;
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return true;
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}
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static ssize_t __namespace_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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struct nd_namespace_common *ndns;
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struct device *found;
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char *name;
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if (dev->driver) {
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dev_dbg(dev, "%s: -EBUSY\n", __func__);
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return -EBUSY;
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}
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name = kstrndup(buf, len, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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strim(name);
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if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
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/* pass */;
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else {
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len = -EINVAL;
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goto out;
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}
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ndns = nd_btt->ndns;
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if (strcmp(name, "") == 0) {
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/* detach the namespace and destroy / reset the btt device */
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nd_btt_detach_ndns(nd_btt);
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if (is_nd_btt_idle(dev))
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nd_device_unregister(dev, ND_ASYNC);
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else {
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nd_btt->lbasize = 0;
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kfree(nd_btt->uuid);
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nd_btt->uuid = NULL;
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}
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goto out;
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} else if (ndns) {
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dev_dbg(dev, "namespace already set to: %s\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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goto out;
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}
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found = device_find_child(dev->parent, name, namespace_match);
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if (!found) {
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dev_dbg(dev, "'%s' not found under %s\n", name,
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dev_name(dev->parent));
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len = -ENODEV;
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goto out;
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}
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ndns = to_ndns(found);
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if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
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dev_dbg(dev, "%s too small to host btt\n", name);
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len = -ENXIO;
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goto out_attach;
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}
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WARN_ON_ONCE(!is_nvdimm_bus_locked(&nd_btt->dev));
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if (!nd_btt_attach_ndns(nd_btt, ndns)) {
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dev_dbg(dev, "%s already claimed\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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}
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out_attach:
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put_device(&ndns->dev); /* from device_find_child */
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out:
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kfree(name);
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return len;
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}
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static ssize_t namespace_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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ssize_t rc;
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nvdimm_bus_lock(dev);
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device_lock(dev);
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rc = __namespace_store(dev, attr, buf, len);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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device_unlock(dev);
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RW(namespace);
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static struct attribute *nd_btt_attributes[] = {
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&dev_attr_sector_size.attr,
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&dev_attr_namespace.attr,
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&dev_attr_uuid.attr,
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NULL,
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};
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static struct attribute_group nd_btt_attribute_group = {
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.attrs = nd_btt_attributes,
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};
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static const struct attribute_group *nd_btt_attribute_groups[] = {
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&nd_btt_attribute_group,
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&nd_device_attribute_group,
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&nd_numa_attribute_group,
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NULL,
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};
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static struct device *__nd_btt_create(struct nd_region *nd_region,
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unsigned long lbasize, u8 *uuid,
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struct nd_namespace_common *ndns)
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{
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struct nd_btt *nd_btt;
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struct device *dev;
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nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
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if (!nd_btt)
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return NULL;
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nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
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if (nd_btt->id < 0) {
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kfree(nd_btt);
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return NULL;
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}
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nd_btt->lbasize = lbasize;
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if (uuid)
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uuid = kmemdup(uuid, 16, GFP_KERNEL);
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nd_btt->uuid = uuid;
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dev = &nd_btt->dev;
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dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
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dev->parent = &nd_region->dev;
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dev->type = &nd_btt_device_type;
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dev->groups = nd_btt_attribute_groups;
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device_initialize(&nd_btt->dev);
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if (ndns && !__nd_btt_attach_ndns(nd_btt, ndns)) {
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dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
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__func__, dev_name(ndns->claim));
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put_device(dev);
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return NULL;
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}
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return dev;
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}
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struct device *nd_btt_create(struct nd_region *nd_region)
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{
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struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
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if (dev)
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__nd_device_register(dev);
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return dev;
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}
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/*
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* nd_btt_sb_checksum: compute checksum for btt info block
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*
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* Returns a fletcher64 checksum of everything in the given info block
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* except the last field (since that's where the checksum lives).
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*/
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u64 nd_btt_sb_checksum(struct btt_sb *btt_sb)
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{
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u64 sum;
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__le64 sum_save;
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sum_save = btt_sb->checksum;
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btt_sb->checksum = 0;
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sum = nd_fletcher64(btt_sb, sizeof(*btt_sb), 1);
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btt_sb->checksum = sum_save;
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return sum;
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}
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EXPORT_SYMBOL(nd_btt_sb_checksum);
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static int __nd_btt_probe(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
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{
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u64 checksum;
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if (!btt_sb || !ndns || !nd_btt)
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return -ENODEV;
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if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb)))
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return -ENXIO;
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if (nvdimm_namespace_capacity(ndns) < SZ_16M)
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return -ENXIO;
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if (memcmp(btt_sb->signature, BTT_SIG, BTT_SIG_LEN) != 0)
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return -ENODEV;
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checksum = le64_to_cpu(btt_sb->checksum);
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btt_sb->checksum = 0;
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if (checksum != nd_btt_sb_checksum(btt_sb))
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return -ENODEV;
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btt_sb->checksum = cpu_to_le64(checksum);
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nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
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nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
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if (!nd_btt->uuid)
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return -ENOMEM;
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__nd_device_register(&nd_btt->dev);
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return 0;
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}
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int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
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{
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int rc;
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struct device *dev;
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struct btt_sb *btt_sb;
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struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
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if (ndns->force_raw)
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return -ENODEV;
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nvdimm_bus_lock(&ndns->dev);
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dev = __nd_btt_create(nd_region, 0, NULL, ndns);
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nvdimm_bus_unlock(&ndns->dev);
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if (!dev)
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return -ENOMEM;
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dev_set_drvdata(dev, drvdata);
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btt_sb = kzalloc(sizeof(*btt_sb), GFP_KERNEL);
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rc = __nd_btt_probe(to_nd_btt(dev), ndns, btt_sb);
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kfree(btt_sb);
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dev_dbg(&ndns->dev, "%s: btt: %s\n", __func__,
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rc == 0 ? dev_name(dev) : "<none>");
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if (rc < 0) {
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__nd_btt_detach_ndns(to_nd_btt(dev));
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put_device(dev);
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}
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return rc;
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}
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EXPORT_SYMBOL(nd_btt_probe);
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