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![Dan Williams](/assets/img/avatar_default.png)
Prepare for other another consumer of this size selection scheme that is not a 'sector size'. Cc: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
360 lines
9 KiB
C
360 lines
9 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_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_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
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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_size_select_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_size_select_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 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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ssize_t rc;
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device_lock(dev);
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nvdimm_bus_lock(dev);
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rc = nd_namespace_store(dev, &nd_btt->ndns, 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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nvdimm_bus_unlock(dev);
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device_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 ssize_t 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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ssize_t rc;
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device_lock(dev);
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if (dev->driver)
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rc = sprintf(buf, "%llu\n", nd_btt->size);
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else {
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/* no size to convey if the btt instance is disabled */
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rc = -ENXIO;
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}
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(size);
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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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&dev_attr_size.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_attach_ndns(&nd_btt->dev, 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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__nd_device_register(dev);
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return dev;
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}
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/**
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* nd_btt_arena_is_valid - check if the metadata layout is valid
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* @nd_btt: device with BTT geometry and backing device info
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* @super: pointer to the arena's info block being tested
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*
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* Check consistency of the btt info block with itself by validating
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* the checksum, and with the parent namespace by verifying the
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* parent_uuid contained in the info block with the one supplied in.
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*
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* Returns:
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* false for an invalid info block, true for a valid one
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*/
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bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
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{
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const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
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u64 checksum;
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if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
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return false;
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if (!guid_is_null((guid_t *)&super->parent_uuid))
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if (memcmp(super->parent_uuid, parent_uuid, 16) != 0)
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return false;
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checksum = le64_to_cpu(super->checksum);
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super->checksum = 0;
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if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
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return false;
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super->checksum = cpu_to_le64(checksum);
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/* TODO: figure out action for this */
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if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
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dev_info(&nd_btt->dev, "Found arena with an error flag\n");
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return true;
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}
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EXPORT_SYMBOL(nd_btt_arena_is_valid);
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int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns,
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struct btt_sb *btt_sb)
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{
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if (ndns->claim_class == NVDIMM_CCLASS_BTT2) {
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/* Probe/setup for BTT v2.0 */
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nd_btt->initial_offset = 0;
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nd_btt->version_major = 2;
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nd_btt->version_minor = 0;
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if (nvdimm_read_bytes(ndns, 0, btt_sb, sizeof(*btt_sb), 0))
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return -ENXIO;
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if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
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return -ENODEV;
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if ((le16_to_cpu(btt_sb->version_major) != 2) ||
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(le16_to_cpu(btt_sb->version_minor) != 0))
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return -ENODEV;
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} else {
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/*
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* Probe/setup for BTT v1.1 (NVDIMM_CCLASS_NONE or
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* NVDIMM_CCLASS_BTT)
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*/
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nd_btt->initial_offset = SZ_4K;
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nd_btt->version_major = 1;
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nd_btt->version_minor = 1;
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if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0))
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return -ENXIO;
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if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
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return -ENODEV;
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if ((le16_to_cpu(btt_sb->version_major) != 1) ||
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(le16_to_cpu(btt_sb->version_minor) != 1))
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return -ENODEV;
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}
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return 0;
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}
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EXPORT_SYMBOL(nd_btt_version);
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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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int rc;
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if (!btt_sb || !ndns || !nd_btt)
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return -ENODEV;
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if (nvdimm_namespace_capacity(ndns) < SZ_16M)
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return -ENXIO;
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rc = nd_btt_version(nd_btt, ndns, btt_sb);
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if (rc < 0)
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return rc;
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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 device *dev, struct nd_namespace_common *ndns)
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{
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int rc;
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struct device *btt_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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switch (ndns->claim_class) {
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case NVDIMM_CCLASS_NONE:
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case NVDIMM_CCLASS_BTT:
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case NVDIMM_CCLASS_BTT2:
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break;
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default:
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return -ENODEV;
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}
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nvdimm_bus_lock(&ndns->dev);
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btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns);
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nvdimm_bus_unlock(&ndns->dev);
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if (!btt_dev)
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return -ENOMEM;
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btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL);
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rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb);
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dev_dbg(dev, "%s: btt: %s\n", __func__,
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rc == 0 ? dev_name(btt_dev) : "<none>");
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if (rc < 0) {
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struct nd_btt *nd_btt = to_nd_btt(btt_dev);
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nd_detach_ndns(btt_dev, &nd_btt->ndns);
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put_device(btt_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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