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/badblocks.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/device.h>
  19 #include <linux/mutex.h>
  20 #include <linux/ndctl.h>
  21 #include <linux/types.h>
  22 #include <linux/nd.h>
  23 #include "label.h"
  24
  25 enum {
  26         /*
  27          * Limits the maximum number of block apertures a dimm can
  28          * support and is an input to the geometry/on-disk-format of a
  29          * BTT instance
  30          */
  31         ND_MAX_LANES = 256,
  32         INT_LBASIZE_ALIGNMENT = 64,
  33         NVDIMM_IO_ATOMIC = 1,
  34 };
  35
  36 struct nvdimm_drvdata {
  37         struct device *dev;
  38         int nslabel_size;
  39         struct nd_cmd_get_config_size nsarea;
  40         void *data;
  41         int ns_current, ns_next;
  42         struct resource dpa;
  43         struct kref kref;
  44 };
  45
  46 struct nd_region_data {
  47         int ns_count;
  48         int ns_active;
  49         unsigned int hints_shift;
  50         void __iomem *flush_wpq[0];
  51 };
  52
  53 static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
  54                 int dimm, int hint)
  55 {
  56         unsigned int num = 1 << ndrd->hints_shift;
  57         unsigned int mask = num - 1;
  58
  59         return ndrd->flush_wpq[dimm * num + (hint & mask)];
  60 }
  61
  62 static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
  63                 int hint, void __iomem *flush)
  64 {
  65         unsigned int num = 1 << ndrd->hints_shift;
  66         unsigned int mask = num - 1;
  67
  68         ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
  69 }
  70
  71 static inline struct nd_namespace_index *to_namespace_index(
  72                 struct nvdimm_drvdata *ndd, int i)
  73 {
  74         if (i < 0)
  75                 return NULL;
  76
  77         return ndd->data + sizeof_namespace_index(ndd) * i;
  78 }
  79
  80 static inline struct nd_namespace_index *to_current_namespace_index(
  81                 struct nvdimm_drvdata *ndd)
  82 {
  83         return to_namespace_index(ndd, ndd->ns_current);
  84 }
  85
  86 static inline struct nd_namespace_index *to_next_namespace_index(
  87                 struct nvdimm_drvdata *ndd)
  88 {
  89         return to_namespace_index(ndd, ndd->ns_next);
  90 }
  91
  92 unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
  93
  94 #define namespace_label_has(ndd, field) \
  95         (offsetof(struct nd_namespace_label, field) \
  96                 < sizeof_namespace_label(ndd))
  97
  98 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
  99         dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
 100                 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
 101                 (unsigned long long) (res ? resource_size(res) : 0), \
 102                 (unsigned long long) (res ? res->start : 0), ##arg)
 103
 104 #define for_each_dpa_resource(ndd, res) \
 105         for (res = (ndd)->dpa.child; res; res = res->sibling)
 106
 107 #define for_each_dpa_resource_safe(ndd, res, next) \
 108         for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
 109                         res; res = next, next = next ? next->sibling : NULL)
 110
 111 struct nd_percpu_lane {
 112         int count;
 113         spinlock_t lock;
 114 };
 115
 116 enum nd_label_flags {
 117         ND_LABEL_REAP,
 118 };
 119 struct nd_label_ent {
 120         struct list_head list;
 121         unsigned long flags;
 122         struct nd_namespace_label *label;
 123 };
 124
 125 enum nd_mapping_lock_class {
 126         ND_MAPPING_CLASS0,
 127         ND_MAPPING_UUID_SCAN,
 128 };
 129
 130 struct nd_mapping {
 131         struct nvdimm *nvdimm;
 132         u64 start;
 133         u64 size;
 134         int position;
 135         struct list_head labels;
 136         struct mutex lock;
 137         /*
 138          * @ndd is for private use at region enable / disable time for
 139          * get_ndd() + put_ndd(), all other nd_mapping to ndd
 140          * conversions use to_ndd() which respects enabled state of the
 141          * nvdimm.
 142          */
 143         struct nvdimm_drvdata *ndd;
 144 };
 145
 146 struct nd_region {
 147         struct device dev;
 148         struct ida ns_ida;
 149         struct ida btt_ida;
 150         struct ida pfn_ida;
 151         struct ida dax_ida;
 152         unsigned long flags;
 153         struct device *ns_seed;
 154         struct device *btt_seed;
 155         struct device *pfn_seed;
 156         struct device *dax_seed;
 157         u16 ndr_mappings;
 158         u64 ndr_size;
 159         u64 ndr_start;
 160         int id, num_lanes, ro, numa_node, target_node;
 161         void *provider_data;
 162         struct kernfs_node *bb_state;
 163         struct badblocks bb;
 164         struct nd_interleave_set *nd_set;
 165         struct nd_percpu_lane __percpu *lane;
 166         struct nd_mapping mapping[0];
 167 };
 168
 169 struct nd_blk_region {
 170         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 171         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 172                         void *iobuf, u64 len, int rw);
 173         void *blk_provider_data;
 174         struct nd_region nd_region;
 175 };
 176
 177 /*
 178  * Lookup next in the repeating sequence of 01, 10, and 11.
 179  */
 180 static inline unsigned nd_inc_seq(unsigned seq)
 181 {
 182         static const unsigned next[] = { 0, 2, 3, 1 };
 183
 184         return next[seq & 3];
 185 }
 186
 187 struct btt;
 188 struct nd_btt {
 189         struct device dev;
 190         struct nd_namespace_common *ndns;
 191         struct btt *btt;
 192         unsigned long lbasize;
 193         u64 size;
 194         u8 *uuid;
 195         int id;
 196         int initial_offset;
 197         u16 version_major;
 198         u16 version_minor;
 199 };
 200
 201 enum nd_pfn_mode {
 202         PFN_MODE_NONE,
 203         PFN_MODE_RAM,
 204         PFN_MODE_PMEM,
 205 };
 206
 207 struct nd_pfn {
 208         int id;
 209         u8 *uuid;
 210         struct device dev;
 211         unsigned long align;
 212         unsigned long npfns;
 213         enum nd_pfn_mode mode;
 214         struct nd_pfn_sb *pfn_sb;
 215         struct nd_namespace_common *ndns;
 216 };
 217
 218 struct nd_dax {
 219         struct nd_pfn nd_pfn;
 220 };
 221
 222 enum nd_async_mode {
 223         ND_SYNC,
 224         ND_ASYNC,
 225 };
 226
 227 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 228 void wait_nvdimm_bus_probe_idle(struct device *dev);
 229 void nd_device_register(struct device *dev);
 230 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 231 void nd_device_notify(struct device *dev, enum nvdimm_event event);
 232 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 233                 size_t len);
 234 ssize_t nd_size_select_show(unsigned long current_size,
 235                 const unsigned long *supported, char *buf);
 236 ssize_t nd_size_select_store(struct device *dev, const char *buf,
 237                 unsigned long *current_size, const unsigned long *supported);
 238 int __init nvdimm_init(void);
 239 int __init nd_region_init(void);
 240 int __init nd_label_init(void);
 241 void nvdimm_exit(void);
 242 void nd_region_exit(void);
 243 struct nvdimm;
 244 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 245 int nvdimm_check_config_data(struct device *dev);
 246 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 247 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 248 int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
 249                            size_t offset, size_t len);
 250 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 251                 void *buf, size_t len);
 252 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 253                 unsigned int len);
 254 void nvdimm_set_aliasing(struct device *dev);
 255 void nvdimm_set_locked(struct device *dev);
 256 void nvdimm_clear_locked(struct device *dev);
 257 int nvdimm_security_setup_events(struct device *dev);
 258 #if IS_ENABLED(CONFIG_NVDIMM_KEYS)
 259 int nvdimm_security_unlock(struct device *dev);
 260 #else
 261 static inline int nvdimm_security_unlock(struct device *dev)
 262 {
 263         return 0;
 264 }
 265 #endif
 266 struct nd_btt *to_nd_btt(struct device *dev);
 267
 268 struct nd_gen_sb {
 269         char reserved[SZ_4K - 8];
 270         __le64 checksum;
 271 };
 272
 273 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 274 #if IS_ENABLED(CONFIG_BTT)
 275 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
 276 bool is_nd_btt(struct device *dev);
 277 struct device *nd_btt_create(struct nd_region *nd_region);
 278 #else
 279 static inline int nd_btt_probe(struct device *dev,
 280                 struct nd_namespace_common *ndns)
 281 {
 282         return -ENODEV;
 283 }
 284
 285 static inline bool is_nd_btt(struct device *dev)
 286 {
 287         return false;
 288 }
 289
 290 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 291 {
 292         return NULL;
 293 }
 294 #endif
 295
 296 struct nd_pfn *to_nd_pfn(struct device *dev);
 297 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
 298
 299 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 300 #define PFN_DEFAULT_ALIGNMENT HPAGE_PMD_SIZE
 301 #else
 302 #define PFN_DEFAULT_ALIGNMENT PAGE_SIZE
 303 #endif
 304
 305 int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
 306 bool is_nd_pfn(struct device *dev);
 307 struct device *nd_pfn_create(struct nd_region *nd_region);
 308 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
 309                 struct nd_namespace_common *ndns);
 310 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
 311 extern struct attribute_group nd_pfn_attribute_group;
 312 #else
 313 static inline int nd_pfn_probe(struct device *dev,
 314                 struct nd_namespace_common *ndns)
 315 {
 316         return -ENODEV;
 317 }
 318
 319 static inline bool is_nd_pfn(struct device *dev)
 320 {
 321         return false;
 322 }
 323
 324 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 325 {
 326         return NULL;
 327 }
 328
 329 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 330 {
 331         return -ENODEV;
 332 }
 333 #endif
 334
 335 struct nd_dax *to_nd_dax(struct device *dev);
 336 #if IS_ENABLED(CONFIG_NVDIMM_DAX)
 337 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
 338 bool is_nd_dax(struct device *dev);
 339 struct device *nd_dax_create(struct nd_region *nd_region);
 340 #else
 341 static inline int nd_dax_probe(struct device *dev,
 342                 struct nd_namespace_common *ndns)
 343 {
 344         return -ENODEV;
 345 }
 346
 347 static inline bool is_nd_dax(struct device *dev)
 348 {
 349         return false;
 350 }
 351
 352 static inline struct device *nd_dax_create(struct nd_region *nd_region)
 353 {
 354         return NULL;
 355 }
 356 #endif
 357
 358 int nd_region_to_nstype(struct nd_region *nd_region);
 359 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 360 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
 361                 struct nd_namespace_index *nsindex);
 362 u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
 363 void nvdimm_bus_lock(struct device *dev);
 364 void nvdimm_bus_unlock(struct device *dev);
 365 bool is_nvdimm_bus_locked(struct device *dev);
 366 int nvdimm_revalidate_disk(struct gendisk *disk);
 367 void nvdimm_drvdata_release(struct kref *kref);
 368 void put_ndd(struct nvdimm_drvdata *ndd);
 369 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 370 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 371 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 372                 struct nd_label_id *label_id, resource_size_t start,
 373                 resource_size_t n);
 374 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 375 bool nvdimm_namespace_locked(struct nd_namespace_common *ndns);
 376 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 377 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 378 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
 379 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 380                 char *name);
 381 unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
 382 void nvdimm_badblocks_populate(struct nd_region *nd_region,
 383                 struct badblocks *bb, const struct resource *res);
 384 #if IS_ENABLED(CONFIG_ND_CLAIM)
 385 int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap);
 386 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio);
 387 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
 388 #else
 389 static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 390                                    struct dev_pagemap *pgmap)
 391 {
 392         return -ENXIO;
 393 }
 394 static inline int devm_nsio_enable(struct device *dev,
 395                 struct nd_namespace_io *nsio)
 396 {
 397         return -ENXIO;
 398 }
 399 static inline void devm_nsio_disable(struct device *dev,
 400                 struct nd_namespace_io *nsio)
 401 {
 402 }
 403 #endif
 404 int nd_blk_region_init(struct nd_region *nd_region);
 405 int nd_region_activate(struct nd_region *nd_region);
 406 void __nd_iostat_start(struct bio *bio, unsigned long *start);
 407 static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
 408 {
 409         struct gendisk *disk = bio->bi_disk;
 410
 411         if (!blk_queue_io_stat(disk->queue))
 412                 return false;
 413
 414         *start = jiffies;
 415         generic_start_io_acct(disk->queue, bio_op(bio), bio_sectors(bio),
 416                               &disk->part0);
 417         return true;
 418 }
 419 static inline void nd_iostat_end(struct bio *bio, unsigned long start)
 420 {
 421         struct gendisk *disk = bio->bi_disk;
 422
 423         generic_end_io_acct(disk->queue, bio_op(bio), &disk->part0, start);
 424 }
 425 static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
 426                 unsigned int len)
 427 {
 428         if (bb->count) {
 429                 sector_t first_bad;
 430                 int num_bad;
 431
 432                 return !!badblocks_check(bb, sector, len / 512, &first_bad,
 433                                 &num_bad);
 434         }
 435
 436         return false;
 437 }
 438 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 439 const u8 *nd_dev_to_uuid(struct device *dev);
 440 bool pmem_should_map_pages(struct device *dev);
 441 #endif /* __ND_H__ */