forked from Minki/linux
f0dc089ce2
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>
220 lines
6.4 KiB
C
220 lines
6.4 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/blkdev.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 <linux/types.h>
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#include "label.h"
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enum {
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/*
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* Limits the maximum number of block apertures a dimm can
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* support and is an input to the geometry/on-disk-format of a
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* BTT instance
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*/
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ND_MAX_LANES = 256,
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SECTOR_SHIFT = 9,
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INT_LBASIZE_ALIGNMENT = 64,
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};
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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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struct kref kref;
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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_label(l, label, labels) \
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for (l = 0; (label = labels ? labels[l] : NULL); l++)
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#define for_each_dpa_resource(ndd, res) \
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for (res = (ndd)->dpa.child; res; res = res->sibling)
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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_percpu_lane {
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int count;
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spinlock_t lock;
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};
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struct nd_region {
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struct device dev;
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struct ida ns_ida;
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struct ida btt_ida;
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struct device *ns_seed;
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struct device *btt_seed;
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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, num_lanes;
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void *provider_data;
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struct nd_interleave_set *nd_set;
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struct nd_percpu_lane __percpu *lane;
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struct nd_mapping mapping[0];
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};
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struct nd_blk_region {
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int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
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void *iobuf, u64 len, int rw);
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void *blk_provider_data;
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struct nd_region nd_region;
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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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struct btt;
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struct nd_btt {
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struct device dev;
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struct nd_namespace_common *ndns;
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struct btt *btt;
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unsigned long lbasize;
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u8 *uuid;
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int id;
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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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int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
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void wait_nvdimm_bus_probe_idle(struct device *dev);
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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 nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
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size_t len);
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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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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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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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struct nvdimm;
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struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
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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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int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
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void *buf, size_t len);
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struct nd_btt *to_nd_btt(struct device *dev);
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struct btt_sb;
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u64 nd_btt_sb_checksum(struct btt_sb *btt_sb);
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#if IS_ENABLED(CONFIG_BTT)
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int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata);
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bool is_nd_btt(struct device *dev);
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struct device *nd_btt_create(struct nd_region *nd_region);
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#else
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static inline nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
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{
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return -ENODEV;
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}
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static inline bool is_nd_btt(struct device *dev)
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{
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return false;
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}
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static inline struct device *nd_btt_create(struct nd_region *nd_region)
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{
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return NULL;
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}
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#endif
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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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u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
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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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void nvdimm_drvdata_release(struct kref *kref);
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void put_ndd(struct nvdimm_drvdata *ndd);
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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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resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
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struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
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int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
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int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
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const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
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char *name);
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int nd_blk_region_init(struct nd_region *nd_region);
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void __nd_iostat_start(struct bio *bio, unsigned long *start);
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static inline bool 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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if (!blk_queue_io_stat(disk->queue))
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return false;
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__nd_iostat_start(bio, start);
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return true;
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}
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void nd_iostat_end(struct bio *bio, unsigned long start);
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resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
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#endif /* __ND_H__ */
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