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367 lines
8.9 KiB
367 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
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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, "trace\n"); |
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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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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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nd_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, "result: %zd wrote: %s%s", rc, buf, |
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buf[len - 1] == '\n' ? "" : "\n"); |
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nvdimm_bus_unlock(dev); |
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nd_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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nd_device_lock(dev); |
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rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len); |
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dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, |
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buf[len - 1] == '\n' ? "" : "\n"); |
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nd_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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nd_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, "result: %zd wrote: %s%s", rc, buf, |
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buf[len - 1] == '\n' ? "" : "\n"); |
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nvdimm_bus_unlock(dev); |
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nd_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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nd_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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nd_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 ssize_t log_zero_flags_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "Y\n"); |
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} |
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static DEVICE_ATTR_RO(log_zero_flags); |
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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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&dev_attr_log_zero_flags.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 const 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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.groups = nd_btt_attribute_groups, |
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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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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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goto out_nd_btt; |
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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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if (!uuid) |
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goto out_put_id; |
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} |
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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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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, "failed, already claimed by %s\n", |
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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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out_put_id: |
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ida_simple_remove(&nd_region->btt_ida, nd_btt->id); |
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out_nd_btt: |
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kfree(nd_btt); |
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return NULL; |
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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, "btt: %s\n", 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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