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 nvdimm_drvdata {
  42         struct device *dev;
  43         int nsindex_size;
  44         struct nd_cmd_get_config_size nsarea;
  45         void *data;
  46         int ns_current, ns_next;
  47         struct resource dpa;
  48         struct kref kref;
  49 };
  50
  51 struct nd_region_namespaces {
  52         int count;
  53         int active;
  54 };
  55
  56 static inline struct nd_namespace_index *to_namespace_index(
  57                 struct nvdimm_drvdata *ndd, int i)
  58 {
  59         if (i < 0)
  60                 return NULL;
  61
  62         return ndd->data + sizeof_namespace_index(ndd) * i;
  63 }
  64
  65 static inline struct nd_namespace_index *to_current_namespace_index(
  66                 struct nvdimm_drvdata *ndd)
  67 {
  68         return to_namespace_index(ndd, ndd->ns_current);
  69 }
  70
  71 static inline struct nd_namespace_index *to_next_namespace_index(
  72                 struct nvdimm_drvdata *ndd)
  73 {
  74         return to_namespace_index(ndd, ndd->ns_next);
  75 }
  76
  77 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
  78         dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
  79                 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
  80                 (unsigned long long) (res ? resource_size(res) : 0), \
  81                 (unsigned long long) (res ? res->start : 0), ##arg)
  82
  83 #define for_each_label(l, label, labels) \
  84         for (l = 0; (label = labels ? labels[l] : NULL); l++)
  85
  86 #define for_each_dpa_resource(ndd, res) \
  87         for (res = (ndd)->dpa.child; res; res = res->sibling)
  88
  89 #define for_each_dpa_resource_safe(ndd, res, next) \
  90         for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
  91                         res; res = next, next = next ? next->sibling : NULL)
  92
  93 struct nd_percpu_lane {
  94         int count;
  95         spinlock_t lock;
  96 };
  97
  98 struct nd_region {
  99         struct device dev;
 100         struct ida ns_ida;
 101         struct ida btt_ida;
 102         struct ida pfn_ida;
 103         unsigned long flags;
 104         struct device *ns_seed;
 105         struct device *btt_seed;
 106         struct device *pfn_seed;
 107         u16 ndr_mappings;
 108         u64 ndr_size;
 109         u64 ndr_start;
 110         int id, num_lanes, ro, numa_node;
 111         void *provider_data;
 112         struct nd_interleave_set *nd_set;
 113         struct nd_percpu_lane __percpu *lane;
 114         struct nd_mapping mapping[0];
 115 };
 116
 117 struct nd_blk_region {
 118         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 119         void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 120         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 121                         void *iobuf, u64 len, int rw);
 122         void *blk_provider_data;
 123         struct nd_region nd_region;
 124 };
 125
 126 /*
 127  * Lookup next in the repeating sequence of 01, 10, and 11.
 128  */
 129 static inline unsigned nd_inc_seq(unsigned seq)
 130 {
 131         static const unsigned next[] = { 0, 2, 3, 1 };
 132
 133         return next[seq & 3];
 134 }
 135
 136 struct btt;
 137 struct nd_btt {
 138         struct device dev;
 139         struct nd_namespace_common *ndns;
 140         struct btt *btt;
 141         unsigned long lbasize;
 142         u8 *uuid;
 143         int id;
 144 };
 145
 146 enum nd_pfn_mode {
 147         PFN_MODE_NONE,
 148         PFN_MODE_RAM,
 149         PFN_MODE_PMEM,
 150 };
 151
 152 struct nd_pfn {
 153         int id;
 154         u8 *uuid;
 155         struct device dev;
 156         unsigned long npfns;
 157         enum nd_pfn_mode mode;
 158         struct nd_pfn_sb *pfn_sb;
 159         struct nd_namespace_common *ndns;
 160 };
 161
 162 enum nd_async_mode {
 163         ND_SYNC,
 164         ND_ASYNC,
 165 };
 166
 167 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 168 void wait_nvdimm_bus_probe_idle(struct device *dev);
 169 void nd_device_register(struct device *dev);
 170 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 171 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 172                 size_t len);
 173 ssize_t nd_sector_size_show(unsigned long current_lbasize,
 174                 const unsigned long *supported, char *buf);
 175 ssize_t nd_sector_size_store(struct device *dev, const char *buf,
 176                 unsigned long *current_lbasize, const unsigned long *supported);
 177 int __init nvdimm_init(void);
 178 int __init nd_region_init(void);
 179 void nvdimm_exit(void);
 180 void nd_region_exit(void);
 181 struct nvdimm;
 182 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 183 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 184 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 185 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 186                 void *buf, size_t len);
 187 struct nd_btt *to_nd_btt(struct device *dev);
 188
 189 struct nd_gen_sb {
 190         char reserved[SZ_4K - 8];
 191         __le64 checksum;
 192 };
 193
 194 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 195 #if IS_ENABLED(CONFIG_BTT)
 196 int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata);
 197 bool is_nd_btt(struct device *dev);
 198 struct device *nd_btt_create(struct nd_region *nd_region);
 199 #else
 200 static inline int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
 201 {
 202         return -ENODEV;
 203 }
 204
 205 static inline bool is_nd_btt(struct device *dev)
 206 {
 207         return false;
 208 }
 209
 210 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 211 {
 212         return NULL;
 213 }
 214 #endif
 215
 216 struct nd_pfn *to_nd_pfn(struct device *dev);
 217 #if IS_ENABLED(CONFIG_NVDIMM_PFN)
 218 int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata);
 219 bool is_nd_pfn(struct device *dev);
 220 struct device *nd_pfn_create(struct nd_region *nd_region);
 221 int nd_pfn_validate(struct nd_pfn *nd_pfn);
 222 #else
 223 static inline int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
 224 {
 225         return -ENODEV;
 226 }
 227
 228 static inline bool is_nd_pfn(struct device *dev)
 229 {
 230         return false;
 231 }
 232
 233 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 234 {
 235         return NULL;
 236 }
 237
 238 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn)
 239 {
 240         return -ENODEV;
 241 }
 242 #endif
 243
 244 struct nd_region *to_nd_region(struct device *dev);
 245 int nd_region_to_nstype(struct nd_region *nd_region);
 246 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 247 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
 248 void nvdimm_bus_lock(struct device *dev);
 249 void nvdimm_bus_unlock(struct device *dev);
 250 bool is_nvdimm_bus_locked(struct device *dev);
 251 int nvdimm_revalidate_disk(struct gendisk *disk);
 252 void nvdimm_drvdata_release(struct kref *kref);
 253 void put_ndd(struct nvdimm_drvdata *ndd);
 254 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 255 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 256 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 257                 struct nd_label_id *label_id, resource_size_t start,
 258                 resource_size_t n);
 259 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 260 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 261 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 262 int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
 263 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 264                 char *name);
 265 int nd_blk_region_init(struct nd_region *nd_region);
 266 void __nd_iostat_start(struct bio *bio, unsigned long *start);
 267 static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
 268 {
 269         struct gendisk *disk = bio->bi_bdev->bd_disk;
 270
 271         if (!blk_queue_io_stat(disk->queue))
 272                 return false;
 273
 274         __nd_iostat_start(bio, start);
 275         return true;
 276 }
 277 void nd_iostat_end(struct bio *bio, unsigned long start);
 278 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 279 const u8 *nd_dev_to_uuid(struct device *dev);
 280 bool pmem_should_map_pages(struct device *dev);
 281 #endif /* __ND_H__ */