drivers/nvdimm/nd.h

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #ifndef __ND_H__
  14 #define __ND_H__
  15 #include <linux/libnvdimm.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/device.h>
  18 #include <linux/mutex.h>
  19 #include <linux/ndctl.h>
  20 #include <linux/types.h>
  21 #include "label.h"
  22
  23 enum {
  24         /*
  25          * Limits the maximum number of block apertures a dimm can
  26          * support and is an input to the geometry/on-disk-format of a
  27          * BTT instance
  28          */
  29         ND_MAX_LANES = 256,
  30         SECTOR_SHIFT = 9,
  31         INT_LBASIZE_ALIGNMENT = 64,
  32 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
  33         ND_PFN_ALIGN = PAGES_PER_SECTION * PAGE_SIZE,
  34         ND_PFN_MASK = ND_PFN_ALIGN - 1,
  35 #else
  36         ND_PFN_ALIGN = 0,
  37         ND_PFN_MASK = 0,
  38 #endif
  39 };
  40
  41 struct nd_poison {
  42         u64 start;
  43         u64 length;
  44         struct list_head list;
  45 };
  46
  47 struct nvdimm_drvdata {
  48         struct device *dev;
  49         int nsindex_size;
  50         struct nd_cmd_get_config_size nsarea;
  51         void *data;
  52         int ns_current, ns_next;
  53         struct resource dpa;
  54         struct kref kref;
  55 };
  56
  57 struct nd_region_namespaces {
  58         int count;
  59         int active;
  60 };
  61
  62 static inline struct nd_namespace_index *to_namespace_index(
  63                 struct nvdimm_drvdata *ndd, int i)
  64 {
  65         if (i < 0)
  66                 return NULL;
  67
  68         return ndd->data + sizeof_namespace_index(ndd) * i;
  69 }
  70
  71 static inline struct nd_namespace_index *to_current_namespace_index(
  72                 struct nvdimm_drvdata *ndd)
  73 {
  74         return to_namespace_index(ndd, ndd->ns_current);
  75 }
  76
  77 static inline struct nd_namespace_index *to_next_namespace_index(
  78                 struct nvdimm_drvdata *ndd)
  79 {
  80         return to_namespace_index(ndd, ndd->ns_next);
  81 }
  82
  83 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
  84         dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
  85                 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
  86                 (unsigned long long) (res ? resource_size(res) : 0), \
  87                 (unsigned long long) (res ? res->start : 0), ##arg)
  88
  89 #define for_each_label(l, label, labels) \
  90         for (l = 0; (label = labels ? labels[l] : NULL); l++)
  91
  92 #define for_each_dpa_resource(ndd, res) \
  93         for (res = (ndd)->dpa.child; res; res = res->sibling)
  94
  95 #define for_each_dpa_resource_safe(ndd, res, next) \
  96         for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
  97                         res; res = next, next = next ? next->sibling : NULL)
  98
  99 struct nd_percpu_lane {
 100         int count;
 101         spinlock_t lock;
 102 };
 103
 104 struct nd_region {
 105         struct device dev;
 106         struct ida ns_ida;
 107         struct ida btt_ida;
 108         struct ida pfn_ida;
 109         unsigned long flags;
 110         struct device *ns_seed;
 111         struct device *btt_seed;
 112         struct device *pfn_seed;
 113         u16 ndr_mappings;
 114         u64 ndr_size;
 115         u64 ndr_start;
 116         int id, num_lanes, ro, numa_node;
 117         void *provider_data;
 118         struct nd_interleave_set *nd_set;
 119         struct nd_percpu_lane __percpu *lane;
 120         struct nd_mapping mapping[0];
 121 };
 122
 123 struct nd_blk_region {
 124         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 125         void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 126         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 127                         void *iobuf, u64 len, int rw);
 128         void *blk_provider_data;
 129         struct nd_region nd_region;
 130 };
 131
 132 /*
 133  * Lookup next in the repeating sequence of 01, 10, and 11.
 134  */
 135 static inline unsigned nd_inc_seq(unsigned seq)
 136 {
 137         static const unsigned next[] = { 0, 2, 3, 1 };
 138
 139         return next[seq & 3];
 140 }
 141
 142 struct btt;
 143 struct nd_btt {
 144         struct device dev;
 145         struct nd_namespace_common *ndns;
 146         struct btt *btt;
 147         unsigned long lbasize;
 148         u8 *uuid;
 149         int id;
 150 };
 151
 152 enum nd_pfn_mode {
 153         PFN_MODE_NONE,
 154         PFN_MODE_RAM,
 155         PFN_MODE_PMEM,
 156 };
 157
 158 struct nd_pfn {
 159         int id;
 160         u8 *uuid;
 161         struct device dev;
 162         unsigned long npfns;
 163         enum nd_pfn_mode mode;
 164         struct nd_pfn_sb *pfn_sb;
 165         struct nd_namespace_common *ndns;
 166 };
 167
 168 enum nd_async_mode {
 169         ND_SYNC,
 170         ND_ASYNC,
 171 };
 172
 173 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 174 void wait_nvdimm_bus_probe_idle(struct device *dev);
 175 void nd_device_register(struct device *dev);
 176 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 177 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 178                 size_t len);
 179 ssize_t nd_sector_size_show(unsigned long current_lbasize,
 180                 const unsigned long *supported, char *buf);
 181 ssize_t nd_sector_size_store(struct device *dev, const char *buf,
 182                 unsigned long *current_lbasize, const unsigned long *supported);
 183 int __init nvdimm_init(void);
 184 int __init nd_region_init(void);
 185 void nvdimm_exit(void);
 186 void nd_region_exit(void);
 187 struct nvdimm;
 188 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 189 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 190 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 191 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 192                 void *buf, size_t len);
 193 struct nd_btt *to_nd_btt(struct device *dev);
 194
 195 struct nd_gen_sb {
 196         char reserved[SZ_4K - 8];
 197         __le64 checksum;
 198 };
 199
 200 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 201 #if IS_ENABLED(CONFIG_BTT)
 202 int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata);
 203 bool is_nd_btt(struct device *dev);
 204 struct device *nd_btt_create(struct nd_region *nd_region);
 205 #else
 206 static inline int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
 207 {
 208         return -ENODEV;
 209 }
 210
 211 static inline bool is_nd_btt(struct device *dev)
 212 {
 213         return false;
 214 }
 215
 216 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 217 {
 218         return NULL;
 219 }
 220 #endif
 221
 222 struct nd_pfn *to_nd_pfn(struct device *dev);
 223 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
 224 int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata);
 225 bool is_nd_pfn(struct device *dev);
 226 struct device *nd_pfn_create(struct nd_region *nd_region);
 227 int nd_pfn_validate(struct nd_pfn *nd_pfn);
 228 #else
 229 static inline int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
 230 {
 231         return -ENODEV;
 232 }
 233
 234 static inline bool is_nd_pfn(struct device *dev)
 235 {
 236         return false;
 237 }
 238
 239 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 240 {
 241         return NULL;
 242 }
 243
 244 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn)
 245 {
 246         return -ENODEV;
 247 }
 248 #endif
 249
 250 struct nd_region *to_nd_region(struct device *dev);
 251 int nd_region_to_nstype(struct nd_region *nd_region);
 252 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 253 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
 254 void nvdimm_bus_lock(struct device *dev);
 255 void nvdimm_bus_unlock(struct device *dev);
 256 bool is_nvdimm_bus_locked(struct device *dev);
 257 int nvdimm_revalidate_disk(struct gendisk *disk);
 258 void nvdimm_drvdata_release(struct kref *kref);
 259 void put_ndd(struct nvdimm_drvdata *ndd);
 260 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 261 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 262 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 263                 struct nd_label_id *label_id, resource_size_t start,
 264                 resource_size_t n);
 265 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 266 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 267 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 268 int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
 269 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 270                 char *name);
 271 int nd_blk_region_init(struct nd_region *nd_region);
 272 void __nd_iostat_start(struct bio *bio, unsigned long *start);
 273 static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
 274 {
 275         struct gendisk *disk = bio->bi_bdev->bd_disk;
 276
 277         if (!blk_queue_io_stat(disk->queue))
 278                 return false;
 279
 280         __nd_iostat_start(bio, start);
 281         return true;
 282 }
 283 void nd_iostat_end(struct bio *bio, unsigned long start);
 284 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 285 const u8 *nd_dev_to_uuid(struct device *dev);
 286 bool pmem_should_map_pages(struct device *dev);
 287 #endif /* __ND_H__ */