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__ */ 282