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         SECTOR_SHIFT = 9,
  33         INT_LBASIZE_ALIGNMENT = 64,
  34         NVDIMM_IO_ATOMIC = 1,
  35 };
  36
  37 struct nd_poison {
  38         u64 start;
  39         u64 length;
  40         struct list_head list;
  41 };
  42
  43 struct nvdimm_drvdata {
  44         struct device *dev;
  45         int nslabel_size;
  46         struct nd_cmd_get_config_size nsarea;
  47         void *data;
  48         int ns_current, ns_next;
  49         struct resource dpa;
  50         struct kref kref;
  51 };
  52
  53 struct nd_region_data {
  54         int ns_count;
  55         int ns_active;
  56         unsigned int hints_shift;
  57         void __iomem *flush_wpq[0];
  58 };
  59
  60 static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
  61                 int dimm, int hint)
  62 {
  63         unsigned int num = 1 << ndrd->hints_shift;
  64         unsigned int mask = num - 1;
  65
  66         return ndrd->flush_wpq[dimm * num + (hint & mask)];
  67 }
  68
  69 static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
  70                 int hint, void __iomem *flush)
  71 {
  72         unsigned int num = 1 << ndrd->hints_shift;
  73         unsigned int mask = num - 1;
  74
  75         ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
  76 }
  77
  78 static inline struct nd_namespace_index *to_namespace_index(
  79                 struct nvdimm_drvdata *ndd, int i)
  80 {
  81         if (i < 0)
  82                 return NULL;
  83
  84         return ndd->data + sizeof_namespace_index(ndd) * i;
  85 }
  86
  87 static inline struct nd_namespace_index *to_current_namespace_index(
  88                 struct nvdimm_drvdata *ndd)
  89 {
  90         return to_namespace_index(ndd, ndd->ns_current);
  91 }
  92
  93 static inline struct nd_namespace_index *to_next_namespace_index(
  94                 struct nvdimm_drvdata *ndd)
  95 {
  96         return to_namespace_index(ndd, ndd->ns_next);
  97 }
  98
  99 unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
 100
 101 #define namespace_label_has(ndd, field) \
 102         (offsetof(struct nd_namespace_label, field) \
 103                 < sizeof_namespace_label(ndd))
 104
 105 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
 106         dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
 107                 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
 108                 (unsigned long long) (res ? resource_size(res) : 0), \
 109                 (unsigned long long) (res ? res->start : 0), ##arg)
 110
 111 #define for_each_dpa_resource(ndd, res) \
 112         for (res = (ndd)->dpa.child; res; res = res->sibling)
 113
 114 #define for_each_dpa_resource_safe(ndd, res, next) \
 115         for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
 116                         res; res = next, next = next ? next->sibling : NULL)
 117
 118 struct nd_percpu_lane {
 119         int count;
 120         spinlock_t lock;
 121 };
 122
 123 struct nd_label_ent {
 124         struct list_head list;
 125         struct nd_namespace_label *label;
 126 };
 127
 128 enum nd_mapping_lock_class {
 129         ND_MAPPING_CLASS0,
 130         ND_MAPPING_UUID_SCAN,
 131 };
 132
 133 struct nd_mapping {
 134         struct nvdimm *nvdimm;
 135         u64 start;
 136         u64 size;
 137         int position;
 138         struct list_head labels;
 139         struct mutex lock;
 140         /*
 141          * @ndd is for private use at region enable / disable time for
 142          * get_ndd() + put_ndd(), all other nd_mapping to ndd
 143          * conversions use to_ndd() which respects enabled state of the
 144          * nvdimm.
 145          */
 146         struct nvdimm_drvdata *ndd;
 147 };
 148
 149 struct nd_region {
 150         struct device dev;
 151         struct ida ns_ida;
 152         struct ida btt_ida;
 153         struct ida pfn_ida;
 154         struct ida dax_ida;
 155         unsigned long flags;
 156         struct device *ns_seed;
 157         struct device *btt_seed;
 158         struct device *pfn_seed;
 159         struct device *dax_seed;
 160         u16 ndr_mappings;
 161         u64 ndr_size;
 162         u64 ndr_start;
 163         int id, num_lanes, ro, numa_node;
 164         void *provider_data;
 165         struct kernfs_node *bb_state;
 166         struct badblocks bb;
 167         struct nd_interleave_set *nd_set;
 168         struct nd_percpu_lane __percpu *lane;
 169         struct nd_mapping mapping[0];
 170 };
 171
 172 struct nd_blk_region {
 173         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 174         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 175                         void *iobuf, u64 len, int rw);
 176         void *blk_provider_data;
 177         struct nd_region nd_region;
 178 };
 179
 180 /*
 181  * Lookup next in the repeating sequence of 01, 10, and 11.
 182  */
 183 static inline unsigned nd_inc_seq(unsigned seq)
 184 {
 185         static const unsigned next[] = { 0, 2, 3, 1 };
 186
 187         return next[seq & 3];
 188 }
 189
 190 struct btt;
 191 struct nd_btt {
 192         struct device dev;
 193         struct nd_namespace_common *ndns;
 194         struct btt *btt;
 195         unsigned long lbasize;
 196         u64 size;
 197         u8 *uuid;
 198         int id;
 199         int initial_offset;
 200         u16 version_major;
 201         u16 version_minor;
 202 };
 203
 204 enum nd_pfn_mode {
 205         PFN_MODE_NONE,
 206         PFN_MODE_RAM,
 207         PFN_MODE_PMEM,
 208 };
 209
 210 struct nd_pfn {
 211         int id;
 212         u8 *uuid;
 213         struct device dev;
 214         unsigned long align;
 215         unsigned long npfns;
 216         enum nd_pfn_mode mode;
 217         struct nd_pfn_sb *pfn_sb;
 218         struct nd_namespace_common *ndns;
 219 };
 220
 221 struct nd_dax {
 222         struct nd_pfn nd_pfn;
 223 };
 224
 225 enum nd_async_mode {
 226         ND_SYNC,
 227         ND_ASYNC,
 228 };
 229
 230 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 231 void wait_nvdimm_bus_probe_idle(struct device *dev);
 232 void nd_device_register(struct device *dev);
 233 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 234 void nd_device_notify(struct device *dev, enum nvdimm_event event);
 235 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 236                 size_t len);
 237 ssize_t nd_size_select_show(unsigned long current_size,
 238                 const unsigned long *supported, char *buf);
 239 ssize_t nd_size_select_store(struct device *dev, const char *buf,
 240                 unsigned long *current_size, const unsigned long *supported);
 241 int __init nvdimm_init(void);
 242 int __init nd_region_init(void);
 243 int __init nd_label_init(void);
 244 void nvdimm_exit(void);
 245 void nd_region_exit(void);
 246 struct nvdimm;
 247 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 248 int nvdimm_check_config_data(struct device *dev);
 249 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 250 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 251 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 252                 void *buf, size_t len);
 253 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 254                 unsigned int len);
 255 void nvdimm_set_aliasing(struct device *dev);
 256 void nvdimm_set_locked(struct device *dev);
 257 struct nd_btt *to_nd_btt(struct device *dev);
 258
 259 struct nd_gen_sb {
 260         char reserved[SZ_4K - 8];
 261         __le64 checksum;
 262 };
 263
 264 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 265 #if IS_ENABLED(CONFIG_BTT)
 266 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
 267 bool is_nd_btt(struct device *dev);
 268 struct device *nd_btt_create(struct nd_region *nd_region);
 269 #else
 270 static inline int nd_btt_probe(struct device *dev,
 271                 struct nd_namespace_common *ndns)
 272 {
 273         return -ENODEV;
 274 }
 275
 276 static inline bool is_nd_btt(struct device *dev)
 277 {
 278         return false;
 279 }
 280
 281 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 282 {
 283         return NULL;
 284 }
 285 #endif
 286
 287 struct nd_pfn *to_nd_pfn(struct device *dev);
 288 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
 289
 290 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 291 #define PFN_DEFAULT_ALIGNMENT HPAGE_PMD_SIZE
 292 #else
 293 #define PFN_DEFAULT_ALIGNMENT PAGE_SIZE
 294 #endif
 295
 296 int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
 297 bool is_nd_pfn(struct device *dev);
 298 struct device *nd_pfn_create(struct nd_region *nd_region);
 299 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
 300                 struct nd_namespace_common *ndns);
 301 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
 302 extern struct attribute_group nd_pfn_attribute_group;
 303 #else
 304 static inline int nd_pfn_probe(struct device *dev,
 305                 struct nd_namespace_common *ndns)
 306 {
 307         return -ENODEV;
 308 }
 309
 310 static inline bool is_nd_pfn(struct device *dev)
 311 {
 312         return false;
 313 }
 314
 315 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 316 {
 317         return NULL;
 318 }
 319
 320 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 321 {
 322         return -ENODEV;
 323 }
 324 #endif
 325
 326 struct nd_dax *to_nd_dax(struct device *dev);
 327 #if IS_ENABLED(CONFIG_NVDIMM_DAX)
 328 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
 329 bool is_nd_dax(struct device *dev);
 330 struct device *nd_dax_create(struct nd_region *nd_region);
 331 #else
 332 static inline int nd_dax_probe(struct device *dev,
 333                 struct nd_namespace_common *ndns)
 334 {
 335         return -ENODEV;
 336 }
 337
 338 static inline bool is_nd_dax(struct device *dev)
 339 {
 340         return false;
 341 }
 342
 343 static inline struct device *nd_dax_create(struct nd_region *nd_region)
 344 {
 345         return NULL;
 346 }
 347 #endif
 348
 349 struct nd_region *to_nd_region(struct device *dev);
 350 int nd_region_to_nstype(struct nd_region *nd_region);
 351 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 352 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
 353                 struct nd_namespace_index *nsindex);
 354 u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
 355 void nvdimm_bus_lock(struct device *dev);
 356 void nvdimm_bus_unlock(struct device *dev);
 357 bool is_nvdimm_bus_locked(struct device *dev);
 358 int nvdimm_revalidate_disk(struct gendisk *disk);
 359 void nvdimm_drvdata_release(struct kref *kref);
 360 void put_ndd(struct nvdimm_drvdata *ndd);
 361 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 362 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 363 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 364                 struct nd_label_id *label_id, resource_size_t start,
 365                 resource_size_t n);
 366 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 367 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 368 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 369 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
 370 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 371                 char *name);
 372 unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
 373 void nvdimm_badblocks_populate(struct nd_region *nd_region,
 374                 struct badblocks *bb, const struct resource *res);
 375 #if IS_ENABLED(CONFIG_ND_CLAIM)
 376 struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 377                 struct resource *res, struct vmem_altmap *altmap);
 378 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio);
 379 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
 380 #else
 381 static inline struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 382                 struct resource *res, struct vmem_altmap *altmap)
 383 {
 384         return ERR_PTR(-ENXIO);
 385 }
 386 static inline int devm_nsio_enable(struct device *dev,
 387                 struct nd_namespace_io *nsio)
 388 {
 389         return -ENXIO;
 390 }
 391 static inline void devm_nsio_disable(struct device *dev,
 392                 struct nd_namespace_io *nsio)
 393 {
 394 }
 395 #endif
 396 int nd_blk_region_init(struct nd_region *nd_region);
 397 int nd_region_activate(struct nd_region *nd_region);
 398 void __nd_iostat_start(struct bio *bio, unsigned long *start);
 399 static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
 400 {
 401         struct gendisk *disk = bio->bi_disk;
 402
 403         if (!blk_queue_io_stat(disk->queue))
 404                 return false;
 405
 406         *start = jiffies;
 407         generic_start_io_acct(disk->queue, bio_data_dir(bio),
 408                               bio_sectors(bio), &disk->part0);
 409         return true;
 410 }
 411 static inline void nd_iostat_end(struct bio *bio, unsigned long start)
 412 {
 413         struct gendisk *disk = bio->bi_disk;
 414
 415         generic_end_io_acct(disk->queue, bio_data_dir(bio), &disk->part0,
 416                                 start);
 417 }
 418 static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
 419                 unsigned int len)
 420 {
 421         if (bb->count) {
 422                 sector_t first_bad;
 423                 int num_bad;
 424
 425                 return !!badblocks_check(bb, sector, len / 512, &first_bad,
 426                                 &num_bad);
 427         }
 428
 429         return false;
 430 }
 431 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 432 const u8 *nd_dev_to_uuid(struct device *dev);
 433 bool pmem_should_map_pages(struct device *dev);
 434 #endif /* __ND_H__ */