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4a826c83db
This on media label format [1] consists of two index blocks followed by
an array of labels. None of these structures are ever updated in place.
A sequence number tracks the current active index and the next one to
write, while labels are written to free slots.
+------------+
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| nsindex0 |
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+------------+
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| nsindex1 |
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+------------+
| label0 |
+------------+
| label1 |
+------------+
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....nslot...
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+------------+
| labelN |
+------------+
After reading valid labels, store the dpa ranges they claim into
per-dimm resource trees.
[1]: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
111 lines
3.1 KiB
C
111 lines
3.1 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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#ifndef __ND_H__
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#define __ND_H__
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#include <linux/libnvdimm.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/ndctl.h>
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#include "label.h"
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struct nvdimm_drvdata {
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struct device *dev;
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int nsindex_size;
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struct nd_cmd_get_config_size nsarea;
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void *data;
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int ns_current, ns_next;
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struct resource dpa;
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};
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struct nd_region_namespaces {
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int count;
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int active;
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};
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static inline struct nd_namespace_index *to_namespace_index(
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struct nvdimm_drvdata *ndd, int i)
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{
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if (i < 0)
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return NULL;
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return ndd->data + sizeof_namespace_index(ndd) * i;
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}
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static inline struct nd_namespace_index *to_current_namespace_index(
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struct nvdimm_drvdata *ndd)
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{
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return to_namespace_index(ndd, ndd->ns_current);
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}
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static inline struct nd_namespace_index *to_next_namespace_index(
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struct nvdimm_drvdata *ndd)
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{
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return to_namespace_index(ndd, ndd->ns_next);
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}
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#define nd_dbg_dpa(r, d, res, fmt, arg...) \
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dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
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(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
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(unsigned long long) (res ? resource_size(res) : 0), \
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(unsigned long long) (res ? res->start : 0), ##arg)
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#define for_each_dpa_resource_safe(ndd, res, next) \
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for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
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res; res = next, next = next ? next->sibling : NULL)
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struct nd_region {
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struct device dev;
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u16 ndr_mappings;
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u64 ndr_size;
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u64 ndr_start;
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int id;
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void *provider_data;
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struct nd_interleave_set *nd_set;
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struct nd_mapping mapping[0];
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};
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/*
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* Lookup next in the repeating sequence of 01, 10, and 11.
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*/
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static inline unsigned nd_inc_seq(unsigned seq)
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{
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static const unsigned next[] = { 0, 2, 3, 1 };
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return next[seq & 3];
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}
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enum nd_async_mode {
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ND_SYNC,
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ND_ASYNC,
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};
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void nd_device_register(struct device *dev);
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void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
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int __init nvdimm_init(void);
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int __init nd_region_init(void);
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void nvdimm_exit(void);
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void nd_region_exit(void);
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int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
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int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
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struct nd_region *to_nd_region(struct device *dev);
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int nd_region_to_nstype(struct nd_region *nd_region);
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int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
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void nvdimm_bus_lock(struct device *dev);
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void nvdimm_bus_unlock(struct device *dev);
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bool is_nvdimm_bus_locked(struct device *dev);
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int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
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void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
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struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
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struct nd_label_id *label_id, resource_size_t start,
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resource_size_t n);
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#endif /* __ND_H__ */
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