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 };
  35
  36 struct nd_poison {
  37         u64 start;
  38         u64 length;
  39         struct list_head list;
  40 };
  41
  42 struct nvdimm_drvdata {
  43         struct device *dev;
  44         int nsindex_size;
  45         struct nd_cmd_get_config_size nsarea;
  46         void *data;
  47         int ns_current, ns_next;
  48         struct resource dpa;
  49         struct kref kref;
  50 };
  51
  52 struct nd_region_data {
  53         int ns_count;
  54         int ns_active;
  55         unsigned int flush_mask;
  56         void __iomem *flush_wpq[0][0];
  57 };
  58
  59 static inline struct nd_namespace_index *to_namespace_index(
  60                 struct nvdimm_drvdata *ndd, int i)
  61 {
  62         if (i < 0)
  63                 return NULL;
  64
  65         return ndd->data + sizeof_namespace_index(ndd) * i;
  66 }
  67
  68 static inline struct nd_namespace_index *to_current_namespace_index(
  69                 struct nvdimm_drvdata *ndd)
  70 {
  71         return to_namespace_index(ndd, ndd->ns_current);
  72 }
  73
  74 static inline struct nd_namespace_index *to_next_namespace_index(
  75                 struct nvdimm_drvdata *ndd)
  76 {
  77         return to_namespace_index(ndd, ndd->ns_next);
  78 }
  79
  80 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
  81         dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
  82                 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
  83                 (unsigned long long) (res ? resource_size(res) : 0), \
  84                 (unsigned long long) (res ? res->start : 0), ##arg)
  85
  86 #define for_each_label(l, label, labels) \
  87         for (l = 0; (label = labels ? labels[l] : NULL); l++)
  88
  89 #define for_each_dpa_resource(ndd, res) \
  90         for (res = (ndd)->dpa.child; res; res = res->sibling)
  91
  92 #define for_each_dpa_resource_safe(ndd, res, next) \
  93         for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
  94                         res; res = next, next = next ? next->sibling : NULL)
  95
  96 struct nd_percpu_lane {
  97         int count;
  98         spinlock_t lock;
  99 };
 100
 101 struct nd_region {
 102         struct device dev;
 103         struct ida ns_ida;
 104         struct ida btt_ida;
 105         struct ida pfn_ida;
 106         struct ida dax_ida;
 107         unsigned long flags;
 108         struct device *ns_seed;
 109         struct device *btt_seed;
 110         struct device *pfn_seed;
 111         struct device *dax_seed;
 112         u16 ndr_mappings;
 113         u64 ndr_size;
 114         u64 ndr_start;
 115         int id, num_lanes, ro, numa_node;
 116         void *provider_data;
 117         struct nd_interleave_set *nd_set;
 118         struct nd_percpu_lane __percpu *lane;
 119         struct nd_mapping mapping[0];
 120 };
 121
 122 struct nd_blk_region {
 123         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 124         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 125                         void *iobuf, u64 len, int rw);
 126         void *blk_provider_data;
 127         struct nd_region nd_region;
 128 };
 129
 130 /*
 131  * Lookup next in the repeating sequence of 01, 10, and 11.
 132  */
 133 static inline unsigned nd_inc_seq(unsigned seq)
 134 {
 135         static const unsigned next[] = { 0, 2, 3, 1 };
 136
 137         return next[seq & 3];
 138 }
 139
 140 struct btt;
 141 struct nd_btt {
 142         struct device dev;
 143         struct nd_namespace_common *ndns;
 144         struct btt *btt;
 145         unsigned long lbasize;
 146         u64 size;
 147         u8 *uuid;
 148         int id;
 149 };
 150
 151 enum nd_pfn_mode {
 152         PFN_MODE_NONE,
 153         PFN_MODE_RAM,
 154         PFN_MODE_PMEM,
 155 };
 156
 157 struct nd_pfn {
 158         int id;
 159         u8 *uuid;
 160         struct device dev;
 161         unsigned long align;
 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 struct nd_dax {
 169         struct nd_pfn nd_pfn;
 170 };
 171
 172 enum nd_async_mode {
 173         ND_SYNC,
 174         ND_ASYNC,
 175 };
 176
 177 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 178 void wait_nvdimm_bus_probe_idle(struct device *dev);
 179 void nd_device_register(struct device *dev);
 180 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 181 void nd_device_notify(struct device *dev, enum nvdimm_event event);
 182 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 183                 size_t len);
 184 ssize_t nd_sector_size_show(unsigned long current_lbasize,
 185                 const unsigned long *supported, char *buf);
 186 ssize_t nd_sector_size_store(struct device *dev, const char *buf,
 187                 unsigned long *current_lbasize, const unsigned long *supported);
 188 int __init nvdimm_init(void);
 189 int __init nd_region_init(void);
 190 void nvdimm_exit(void);
 191 void nd_region_exit(void);
 192 struct nvdimm;
 193 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 194 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 195 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 196 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 197                 void *buf, size_t len);
 198 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 199                 unsigned int len);
 200 struct nd_btt *to_nd_btt(struct device *dev);
 201
 202 struct nd_gen_sb {
 203         char reserved[SZ_4K - 8];
 204         __le64 checksum;
 205 };
 206
 207 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 208 #if IS_ENABLED(CONFIG_BTT)
 209 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
 210 bool is_nd_btt(struct device *dev);
 211 struct device *nd_btt_create(struct nd_region *nd_region);
 212 #else
 213 static inline int nd_btt_probe(struct device *dev,
 214                 struct nd_namespace_common *ndns)
 215 {
 216         return -ENODEV;
 217 }
 218
 219 static inline bool is_nd_btt(struct device *dev)
 220 {
 221         return false;
 222 }
 223
 224 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 225 {
 226         return NULL;
 227 }
 228 #endif
 229
 230 struct nd_pfn *to_nd_pfn(struct device *dev);
 231 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
 232 int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
 233 bool is_nd_pfn(struct device *dev);
 234 struct device *nd_pfn_create(struct nd_region *nd_region);
 235 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
 236                 struct nd_namespace_common *ndns);
 237 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
 238 extern struct attribute_group nd_pfn_attribute_group;
 239 #else
 240 static inline int nd_pfn_probe(struct device *dev,
 241                 struct nd_namespace_common *ndns)
 242 {
 243         return -ENODEV;
 244 }
 245
 246 static inline bool is_nd_pfn(struct device *dev)
 247 {
 248         return false;
 249 }
 250
 251 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 252 {
 253         return NULL;
 254 }
 255
 256 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 257 {
 258         return -ENODEV;
 259 }
 260 #endif
 261
 262 struct nd_dax *to_nd_dax(struct device *dev);
 263 #if IS_ENABLED(CONFIG_NVDIMM_DAX)
 264 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
 265 bool is_nd_dax(struct device *dev);
 266 struct device *nd_dax_create(struct nd_region *nd_region);
 267 #else
 268 static inline int nd_dax_probe(struct device *dev,
 269                 struct nd_namespace_common *ndns)
 270 {
 271         return -ENODEV;
 272 }
 273
 274 static inline bool is_nd_dax(struct device *dev)
 275 {
 276         return false;
 277 }
 278
 279 static inline struct device *nd_dax_create(struct nd_region *nd_region)
 280 {
 281         return NULL;
 282 }
 283 #endif
 284
 285 struct nd_region *to_nd_region(struct device *dev);
 286 int nd_region_to_nstype(struct nd_region *nd_region);
 287 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 288 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
 289 void nvdimm_bus_lock(struct device *dev);
 290 void nvdimm_bus_unlock(struct device *dev);
 291 bool is_nvdimm_bus_locked(struct device *dev);
 292 int nvdimm_revalidate_disk(struct gendisk *disk);
 293 void nvdimm_drvdata_release(struct kref *kref);
 294 void put_ndd(struct nvdimm_drvdata *ndd);
 295 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 296 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 297 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 298                 struct nd_label_id *label_id, resource_size_t start,
 299                 resource_size_t n);
 300 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 301 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 302 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 303 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
 304 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 305                 char *name);
 306 void nvdimm_badblocks_populate(struct nd_region *nd_region,
 307                 struct badblocks *bb, const struct resource *res);
 308 #if IS_ENABLED(CONFIG_ND_CLAIM)
 309 struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 310                 struct resource *res, struct vmem_altmap *altmap);
 311 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio);
 312 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
 313 #else
 314 static inline struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 315                 struct resource *res, struct vmem_altmap *altmap)
 316 {
 317         return ERR_PTR(-ENXIO);
 318 }
 319 static inline int devm_nsio_enable(struct device *dev,
 320                 struct nd_namespace_io *nsio)
 321 {
 322         return -ENXIO;
 323 }
 324 static inline void devm_nsio_disable(struct device *dev,
 325                 struct nd_namespace_io *nsio)
 326 {
 327 }
 328 #endif
 329 int nd_blk_region_init(struct nd_region *nd_region);
 330 int nd_region_activate(struct nd_region *nd_region);
 331 void __nd_iostat_start(struct bio *bio, unsigned long *start);
 332 static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
 333 {
 334         struct gendisk *disk = bio->bi_bdev->bd_disk;
 335
 336         if (!blk_queue_io_stat(disk->queue))
 337                 return false;
 338
 339         __nd_iostat_start(bio, start);
 340         return true;
 341 }
 342 void nd_iostat_end(struct bio *bio, unsigned long start);
 343 static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
 344                 unsigned int len)
 345 {
 346         if (bb->count) {
 347                 sector_t first_bad;
 348                 int num_bad;
 349
 350                 return !!badblocks_check(bb, sector, len / 512, &first_bad,
 351                                 &num_bad);
 352         }
 353
 354         return false;
 355 }
 356 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 357 const u8 *nd_dev_to_uuid(struct device *dev);
 358 bool pmem_should_map_pages(struct device *dev);
 359 #endif /* __ND_H__ */