drivers/nvdimm/nd.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #ifndef __ND_H__
   6 #define __ND_H__
   7 #include <linux/libnvdimm.h>
   8 #include <linux/badblocks.h>
   9 #include <linux/blkdev.h>
  10 #include <linux/device.h>
  11 #include <linux/mutex.h>
  12 #include <linux/ndctl.h>
  13 #include <linux/types.h>
  14 #include <linux/nd.h>
  15 #include "label.h"
  16
  17 enum {
  18         /*
  19          * Limits the maximum number of block apertures a dimm can
  20          * support and is an input to the geometry/on-disk-format of a
  21          * BTT instance
  22          */
  23         ND_MAX_LANES = 256,
  24         INT_LBASIZE_ALIGNMENT = 64,
  25         NVDIMM_IO_ATOMIC = 1,
  26 };
  27
  28 struct nvdimm_drvdata {
  29         struct device *dev;
  30         int nslabel_size;
  31         struct nd_cmd_get_config_size nsarea;
  32         void *data;
  33         int ns_current, ns_next;
  34         struct resource dpa;
  35         struct kref kref;
  36 };
  37
  38 struct nd_region_data {
  39         int ns_count;
  40         int ns_active;
  41         unsigned int hints_shift;
  42         void __iomem *flush_wpq[];
  43 };
  44
  45 static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
  46                 int dimm, int hint)
  47 {
  48         unsigned int num = 1 << ndrd->hints_shift;
  49         unsigned int mask = num - 1;
  50
  51         return ndrd->flush_wpq[dimm * num + (hint & mask)];
  52 }
  53
  54 static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
  55                 int hint, void __iomem *flush)
  56 {
  57         unsigned int num = 1 << ndrd->hints_shift;
  58         unsigned int mask = num - 1;
  59
  60         ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
  61 }
  62
  63 static inline struct nd_namespace_index *to_namespace_index(
  64                 struct nvdimm_drvdata *ndd, int i)
  65 {
  66         if (i < 0)
  67                 return NULL;
  68
  69         return ndd->data + sizeof_namespace_index(ndd) * i;
  70 }
  71
  72 static inline struct nd_namespace_index *to_current_namespace_index(
  73                 struct nvdimm_drvdata *ndd)
  74 {
  75         return to_namespace_index(ndd, ndd->ns_current);
  76 }
  77
  78 static inline struct nd_namespace_index *to_next_namespace_index(
  79                 struct nvdimm_drvdata *ndd)
  80 {
  81         return to_namespace_index(ndd, ndd->ns_next);
  82 }
  83
  84 unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
  85
  86 #define namespace_label_has(ndd, field) \
  87         (offsetof(struct nd_namespace_label, field) \
  88                 < sizeof_namespace_label(ndd))
  89
  90 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
  91         dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
  92                 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
  93                 (unsigned long long) (res ? resource_size(res) : 0), \
  94                 (unsigned long long) (res ? res->start : 0), ##arg)
  95
  96 #define for_each_dpa_resource(ndd, res) \
  97         for (res = (ndd)->dpa.child; res; res = res->sibling)
  98
  99 #define for_each_dpa_resource_safe(ndd, res, next) \
 100         for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
 101                         res; res = next, next = next ? next->sibling : NULL)
 102
 103 struct nd_percpu_lane {
 104         int count;
 105         spinlock_t lock;
 106 };
 107
 108 enum nd_label_flags {
 109         ND_LABEL_REAP,
 110 };
 111 struct nd_label_ent {
 112         struct list_head list;
 113         unsigned long flags;
 114         struct nd_namespace_label *label;
 115 };
 116
 117 enum nd_mapping_lock_class {
 118         ND_MAPPING_CLASS0,
 119         ND_MAPPING_UUID_SCAN,
 120 };
 121
 122 struct nd_mapping {
 123         struct nvdimm *nvdimm;
 124         u64 start;
 125         u64 size;
 126         int position;
 127         struct list_head labels;
 128         struct mutex lock;
 129         /*
 130          * @ndd is for private use at region enable / disable time for
 131          * get_ndd() + put_ndd(), all other nd_mapping to ndd
 132          * conversions use to_ndd() which respects enabled state of the
 133          * nvdimm.
 134          */
 135         struct nvdimm_drvdata *ndd;
 136 };
 137
 138 struct nd_region {
 139         struct device dev;
 140         struct ida ns_ida;
 141         struct ida btt_ida;
 142         struct ida pfn_ida;
 143         struct ida dax_ida;
 144         unsigned long flags;
 145         struct device *ns_seed;
 146         struct device *btt_seed;
 147         struct device *pfn_seed;
 148         struct device *dax_seed;
 149         unsigned long align;
 150         u16 ndr_mappings;
 151         u64 ndr_size;
 152         u64 ndr_start;
 153         int id, num_lanes, ro, numa_node, target_node;
 154         void *provider_data;
 155         struct kernfs_node *bb_state;
 156         struct badblocks bb;
 157         struct nd_interleave_set *nd_set;
 158         struct nd_percpu_lane __percpu *lane;
 159         int (*flush)(struct nd_region *nd_region, struct bio *bio);
 160         struct nd_mapping mapping[];
 161 };
 162
 163 struct nd_blk_region {
 164         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 165         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 166                         void *iobuf, u64 len, int rw);
 167         void *blk_provider_data;
 168         struct nd_region nd_region;
 169 };
 170
 171 /*
 172  * Lookup next in the repeating sequence of 01, 10, and 11.
 173  */
 174 static inline unsigned nd_inc_seq(unsigned seq)
 175 {
 176         static const unsigned next[] = { 0, 2, 3, 1 };
 177
 178         return next[seq & 3];
 179 }
 180
 181 struct btt;
 182 struct nd_btt {
 183         struct device dev;
 184         struct nd_namespace_common *ndns;
 185         struct btt *btt;
 186         unsigned long lbasize;
 187         u64 size;
 188         u8 *uuid;
 189         int id;
 190         int initial_offset;
 191         u16 version_major;
 192         u16 version_minor;
 193 };
 194
 195 enum nd_pfn_mode {
 196         PFN_MODE_NONE,
 197         PFN_MODE_RAM,
 198         PFN_MODE_PMEM,
 199 };
 200
 201 struct nd_pfn {
 202         int id;
 203         u8 *uuid;
 204         struct device dev;
 205         unsigned long align;
 206         unsigned long npfns;
 207         enum nd_pfn_mode mode;
 208         struct nd_pfn_sb *pfn_sb;
 209         struct nd_namespace_common *ndns;
 210 };
 211
 212 struct nd_dax {
 213         struct nd_pfn nd_pfn;
 214 };
 215
 216 static inline u32 nd_info_block_reserve(void)
 217 {
 218         return ALIGN(SZ_8K, PAGE_SIZE);
 219 }
 220
 221 enum nd_async_mode {
 222         ND_SYNC,
 223         ND_ASYNC,
 224 };
 225
 226 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 227 void wait_nvdimm_bus_probe_idle(struct device *dev);
 228 void nd_device_register(struct device *dev);
 229 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 230 void nd_device_notify(struct device *dev, enum nvdimm_event event);
 231 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 232                 size_t len);
 233 ssize_t nd_size_select_show(unsigned long current_size,
 234                 const unsigned long *supported, char *buf);
 235 ssize_t nd_size_select_store(struct device *dev, const char *buf,
 236                 unsigned long *current_size, const unsigned long *supported);
 237 int __init nvdimm_init(void);
 238 int __init nd_region_init(void);
 239 int __init nd_label_init(void);
 240 void nvdimm_exit(void);
 241 void nd_region_exit(void);
 242 struct nvdimm;
 243 extern const struct attribute_group nd_device_attribute_group;
 244 extern const struct attribute_group nd_numa_attribute_group;
 245 extern const struct attribute_group *nvdimm_bus_attribute_groups[];
 246 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 247 int nvdimm_check_config_data(struct device *dev);
 248 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 249 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 250 int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
 251                            size_t offset, size_t len);
 252 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 253                 void *buf, size_t len);
 254 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 255                 unsigned int len);
 256 void nvdimm_set_labeling(struct device *dev);
 257 void nvdimm_set_locked(struct device *dev);
 258 void nvdimm_clear_locked(struct device *dev);
 259 int nvdimm_security_setup_events(struct device *dev);
 260 #if IS_ENABLED(CONFIG_NVDIMM_KEYS)
 261 int nvdimm_security_unlock(struct device *dev);
 262 #else
 263 static inline int nvdimm_security_unlock(struct device *dev)
 264 {
 265         return 0;
 266 }
 267 #endif
 268 struct nd_btt *to_nd_btt(struct device *dev);
 269
 270 struct nd_gen_sb {
 271         char reserved[SZ_4K - 8];
 272         __le64 checksum;
 273 };
 274
 275 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 276 #if IS_ENABLED(CONFIG_BTT)
 277 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
 278 bool is_nd_btt(struct device *dev);
 279 struct device *nd_btt_create(struct nd_region *nd_region);
 280 #else
 281 static inline int nd_btt_probe(struct device *dev,
 282                 struct nd_namespace_common *ndns)
 283 {
 284         return -ENODEV;
 285 }
 286
 287 static inline bool is_nd_btt(struct device *dev)
 288 {
 289         return false;
 290 }
 291
 292 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 293 {
 294         return NULL;
 295 }
 296 #endif
 297
 298 struct nd_pfn *to_nd_pfn(struct device *dev);
 299 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
 300
 301 #define MAX_NVDIMM_ALIGN        4
 302
 303 int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
 304 bool is_nd_pfn(struct device *dev);
 305 struct device *nd_pfn_create(struct nd_region *nd_region);
 306 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
 307                 struct nd_namespace_common *ndns);
 308 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
 309 extern const struct attribute_group *nd_pfn_attribute_groups[];
 310 #else
 311 static inline int nd_pfn_probe(struct device *dev,
 312                 struct nd_namespace_common *ndns)
 313 {
 314         return -ENODEV;
 315 }
 316
 317 static inline bool is_nd_pfn(struct device *dev)
 318 {
 319         return false;
 320 }
 321
 322 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 323 {
 324         return NULL;
 325 }
 326
 327 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 328 {
 329         return -ENODEV;
 330 }
 331 #endif
 332
 333 struct nd_dax *to_nd_dax(struct device *dev);
 334 #if IS_ENABLED(CONFIG_NVDIMM_DAX)
 335 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
 336 bool is_nd_dax(struct device *dev);
 337 struct device *nd_dax_create(struct nd_region *nd_region);
 338 #else
 339 static inline int nd_dax_probe(struct device *dev,
 340                 struct nd_namespace_common *ndns)
 341 {
 342         return -ENODEV;
 343 }
 344
 345 static inline bool is_nd_dax(struct device *dev)
 346 {
 347         return false;
 348 }
 349
 350 static inline struct device *nd_dax_create(struct nd_region *nd_region)
 351 {
 352         return NULL;
 353 }
 354 #endif
 355
 356 int nd_region_to_nstype(struct nd_region *nd_region);
 357 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 358 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
 359                 struct nd_namespace_index *nsindex);
 360 u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
 361 void nvdimm_bus_lock(struct device *dev);
 362 void nvdimm_bus_unlock(struct device *dev);
 363 bool is_nvdimm_bus_locked(struct device *dev);
 364 void nvdimm_check_and_set_ro(struct gendisk *disk);
 365 void nvdimm_drvdata_release(struct kref *kref);
 366 void put_ndd(struct nvdimm_drvdata *ndd);
 367 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 368 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 369 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 370                 struct nd_label_id *label_id, resource_size_t start,
 371                 resource_size_t n);
 372 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 373 bool nvdimm_namespace_locked(struct nd_namespace_common *ndns);
 374 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 375 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 376 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
 377 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 378                 char *name);
 379 unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
 380 struct range;
 381 void nvdimm_badblocks_populate(struct nd_region *nd_region,
 382                 struct badblocks *bb, const struct range *range);
 383 int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
 384                 resource_size_t size);
 385 void devm_namespace_disable(struct device *dev,
 386                 struct nd_namespace_common *ndns);
 387 #if IS_ENABLED(CONFIG_ND_CLAIM)
 388 /* max struct page size independent of kernel config */
 389 #define MAX_STRUCT_PAGE_SIZE 64
 390 int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap);
 391 #else
 392 static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 393                                    struct dev_pagemap *pgmap)
 394 {
 395         return -ENXIO;
 396 }
 397 #endif
 398 int nd_blk_region_init(struct nd_region *nd_region);
 399 int nd_region_activate(struct nd_region *nd_region);
 400 static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
 401                 unsigned int len)
 402 {
 403         if (bb->count) {
 404                 sector_t first_bad;
 405                 int num_bad;
 406
 407                 return !!badblocks_check(bb, sector, len / 512, &first_bad,
 408                                 &num_bad);
 409         }
 410
 411         return false;
 412 }
 413 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 414 const u8 *nd_dev_to_uuid(struct device *dev);
 415 bool pmem_should_map_pages(struct device *dev);
 416 #endif /* __ND_H__ */