Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Block Translation Table |
| 3 | * Copyright (c) 2014-2015, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | */ |
| 14 | #include <linux/highmem.h> |
| 15 | #include <linux/debugfs.h> |
| 16 | #include <linux/blkdev.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/mutex.h> |
| 20 | #include <linux/hdreg.h> |
| 21 | #include <linux/genhd.h> |
| 22 | #include <linux/sizes.h> |
| 23 | #include <linux/ndctl.h> |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/nd.h> |
| 26 | #include "btt.h" |
| 27 | #include "nd.h" |
| 28 | |
| 29 | enum log_ent_request { |
| 30 | LOG_NEW_ENT = 0, |
| 31 | LOG_OLD_ENT |
| 32 | }; |
| 33 | |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 34 | static struct device *to_dev(struct arena_info *arena) |
| 35 | { |
| 36 | return &arena->nd_btt->dev; |
| 37 | } |
| 38 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 39 | static u64 adjust_initial_offset(struct nd_btt *nd_btt, u64 offset) |
| 40 | { |
| 41 | return offset + nd_btt->initial_offset; |
| 42 | } |
| 43 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 44 | static int arena_read_bytes(struct arena_info *arena, resource_size_t offset, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 45 | void *buf, size_t n, unsigned long flags) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 46 | { |
| 47 | struct nd_btt *nd_btt = arena->nd_btt; |
| 48 | struct nd_namespace_common *ndns = nd_btt->ndns; |
| 49 | |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 50 | /* arena offsets may be shifted from the base of the device */ |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 51 | offset = adjust_initial_offset(nd_btt, offset); |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 52 | return nvdimm_read_bytes(ndns, offset, buf, n, flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 53 | } |
| 54 | |
| 55 | static int arena_write_bytes(struct arena_info *arena, resource_size_t offset, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 56 | void *buf, size_t n, unsigned long flags) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 57 | { |
| 58 | struct nd_btt *nd_btt = arena->nd_btt; |
| 59 | struct nd_namespace_common *ndns = nd_btt->ndns; |
| 60 | |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 61 | /* arena offsets may be shifted from the base of the device */ |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 62 | offset = adjust_initial_offset(nd_btt, offset); |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 63 | return nvdimm_write_bytes(ndns, offset, buf, n, flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | static int btt_info_write(struct arena_info *arena, struct btt_sb *super) |
| 67 | { |
| 68 | int ret; |
| 69 | |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 70 | /* |
| 71 | * infooff and info2off should always be at least 512B aligned. |
| 72 | * We rely on that to make sure rw_bytes does error clearing |
| 73 | * correctly, so make sure that is the case. |
| 74 | */ |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 75 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->infooff, 512), |
| 76 | "arena->infooff: %#llx is unaligned\n", arena->infooff); |
| 77 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->info2off, 512), |
| 78 | "arena->info2off: %#llx is unaligned\n", arena->info2off); |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 79 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 80 | ret = arena_write_bytes(arena, arena->info2off, super, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 81 | sizeof(struct btt_sb), 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 82 | if (ret) |
| 83 | return ret; |
| 84 | |
| 85 | return arena_write_bytes(arena, arena->infooff, super, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 86 | sizeof(struct btt_sb), 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | static int btt_info_read(struct arena_info *arena, struct btt_sb *super) |
| 90 | { |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 91 | return arena_read_bytes(arena, arena->infooff, super, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 92 | sizeof(struct btt_sb), 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | /* |
| 96 | * 'raw' version of btt_map write |
| 97 | * Assumptions: |
| 98 | * mapping is in little-endian |
| 99 | * mapping contains 'E' and 'Z' flags as desired |
| 100 | */ |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 101 | static int __btt_map_write(struct arena_info *arena, u32 lba, __le32 mapping, |
| 102 | unsigned long flags) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 103 | { |
| 104 | u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); |
| 105 | |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 106 | if (unlikely(lba >= arena->external_nlba)) |
| 107 | dev_err_ratelimited(to_dev(arena), |
| 108 | "%s: lba %#x out of range (max: %#x)\n", |
| 109 | __func__, lba, arena->external_nlba); |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 110 | return arena_write_bytes(arena, ns_off, &mapping, MAP_ENT_SIZE, flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | static int btt_map_write(struct arena_info *arena, u32 lba, u32 mapping, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 114 | u32 z_flag, u32 e_flag, unsigned long rwb_flags) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 115 | { |
| 116 | u32 ze; |
| 117 | __le32 mapping_le; |
| 118 | |
| 119 | /* |
| 120 | * This 'mapping' is supposed to be just the LBA mapping, without |
| 121 | * any flags set, so strip the flag bits. |
| 122 | */ |
Vishal Verma | 0595d53 | 2017-08-30 19:35:59 -0600 | [diff] [blame] | 123 | mapping = ent_lba(mapping); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 124 | |
| 125 | ze = (z_flag << 1) + e_flag; |
| 126 | switch (ze) { |
| 127 | case 0: |
| 128 | /* |
| 129 | * We want to set neither of the Z or E flags, and |
| 130 | * in the actual layout, this means setting the bit |
| 131 | * positions of both to '1' to indicate a 'normal' |
| 132 | * map entry |
| 133 | */ |
| 134 | mapping |= MAP_ENT_NORMAL; |
| 135 | break; |
| 136 | case 1: |
| 137 | mapping |= (1 << MAP_ERR_SHIFT); |
| 138 | break; |
| 139 | case 2: |
| 140 | mapping |= (1 << MAP_TRIM_SHIFT); |
| 141 | break; |
| 142 | default: |
| 143 | /* |
| 144 | * The case where Z and E are both sent in as '1' could be |
| 145 | * construed as a valid 'normal' case, but we decide not to, |
| 146 | * to avoid confusion |
| 147 | */ |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 148 | dev_err_ratelimited(to_dev(arena), |
| 149 | "Invalid use of Z and E flags\n"); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 150 | return -EIO; |
| 151 | } |
| 152 | |
| 153 | mapping_le = cpu_to_le32(mapping); |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 154 | return __btt_map_write(arena, lba, mapping_le, rwb_flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | static int btt_map_read(struct arena_info *arena, u32 lba, u32 *mapping, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 158 | int *trim, int *error, unsigned long rwb_flags) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 159 | { |
| 160 | int ret; |
| 161 | __le32 in; |
| 162 | u32 raw_mapping, postmap, ze, z_flag, e_flag; |
| 163 | u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); |
| 164 | |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 165 | if (unlikely(lba >= arena->external_nlba)) |
| 166 | dev_err_ratelimited(to_dev(arena), |
| 167 | "%s: lba %#x out of range (max: %#x)\n", |
| 168 | __func__, lba, arena->external_nlba); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 169 | |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 170 | ret = arena_read_bytes(arena, ns_off, &in, MAP_ENT_SIZE, rwb_flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 171 | if (ret) |
| 172 | return ret; |
| 173 | |
| 174 | raw_mapping = le32_to_cpu(in); |
| 175 | |
Vishal Verma | 0595d53 | 2017-08-30 19:35:59 -0600 | [diff] [blame] | 176 | z_flag = ent_z_flag(raw_mapping); |
| 177 | e_flag = ent_e_flag(raw_mapping); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 178 | ze = (z_flag << 1) + e_flag; |
Vishal Verma | 0595d53 | 2017-08-30 19:35:59 -0600 | [diff] [blame] | 179 | postmap = ent_lba(raw_mapping); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 180 | |
| 181 | /* Reuse the {z,e}_flag variables for *trim and *error */ |
| 182 | z_flag = 0; |
| 183 | e_flag = 0; |
| 184 | |
| 185 | switch (ze) { |
| 186 | case 0: |
| 187 | /* Initial state. Return postmap = premap */ |
| 188 | *mapping = lba; |
| 189 | break; |
| 190 | case 1: |
| 191 | *mapping = postmap; |
| 192 | e_flag = 1; |
| 193 | break; |
| 194 | case 2: |
| 195 | *mapping = postmap; |
| 196 | z_flag = 1; |
| 197 | break; |
| 198 | case 3: |
| 199 | *mapping = postmap; |
| 200 | break; |
| 201 | default: |
| 202 | return -EIO; |
| 203 | } |
| 204 | |
| 205 | if (trim) |
| 206 | *trim = z_flag; |
| 207 | if (error) |
| 208 | *error = e_flag; |
| 209 | |
| 210 | return ret; |
| 211 | } |
| 212 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 213 | static int btt_log_group_read(struct arena_info *arena, u32 lane, |
| 214 | struct log_group *log) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 215 | { |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 216 | return arena_read_bytes(arena, |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 217 | arena->logoff + (lane * LOG_GRP_SIZE), log, |
| 218 | LOG_GRP_SIZE, 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | static struct dentry *debugfs_root; |
| 222 | |
| 223 | static void arena_debugfs_init(struct arena_info *a, struct dentry *parent, |
| 224 | int idx) |
| 225 | { |
| 226 | char dirname[32]; |
| 227 | struct dentry *d; |
| 228 | |
| 229 | /* If for some reason, parent bttN was not created, exit */ |
| 230 | if (!parent) |
| 231 | return; |
| 232 | |
| 233 | snprintf(dirname, 32, "arena%d", idx); |
| 234 | d = debugfs_create_dir(dirname, parent); |
| 235 | if (IS_ERR_OR_NULL(d)) |
| 236 | return; |
| 237 | a->debugfs_dir = d; |
| 238 | |
| 239 | debugfs_create_x64("size", S_IRUGO, d, &a->size); |
| 240 | debugfs_create_x64("external_lba_start", S_IRUGO, d, |
| 241 | &a->external_lba_start); |
| 242 | debugfs_create_x32("internal_nlba", S_IRUGO, d, &a->internal_nlba); |
| 243 | debugfs_create_u32("internal_lbasize", S_IRUGO, d, |
| 244 | &a->internal_lbasize); |
| 245 | debugfs_create_x32("external_nlba", S_IRUGO, d, &a->external_nlba); |
| 246 | debugfs_create_u32("external_lbasize", S_IRUGO, d, |
| 247 | &a->external_lbasize); |
| 248 | debugfs_create_u32("nfree", S_IRUGO, d, &a->nfree); |
| 249 | debugfs_create_u16("version_major", S_IRUGO, d, &a->version_major); |
| 250 | debugfs_create_u16("version_minor", S_IRUGO, d, &a->version_minor); |
| 251 | debugfs_create_x64("nextoff", S_IRUGO, d, &a->nextoff); |
| 252 | debugfs_create_x64("infooff", S_IRUGO, d, &a->infooff); |
| 253 | debugfs_create_x64("dataoff", S_IRUGO, d, &a->dataoff); |
| 254 | debugfs_create_x64("mapoff", S_IRUGO, d, &a->mapoff); |
| 255 | debugfs_create_x64("logoff", S_IRUGO, d, &a->logoff); |
| 256 | debugfs_create_x64("info2off", S_IRUGO, d, &a->info2off); |
| 257 | debugfs_create_x32("flags", S_IRUGO, d, &a->flags); |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 258 | debugfs_create_u32("log_index_0", S_IRUGO, d, &a->log_index[0]); |
| 259 | debugfs_create_u32("log_index_1", S_IRUGO, d, &a->log_index[1]); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | static void btt_debugfs_init(struct btt *btt) |
| 263 | { |
| 264 | int i = 0; |
| 265 | struct arena_info *arena; |
| 266 | |
| 267 | btt->debugfs_dir = debugfs_create_dir(dev_name(&btt->nd_btt->dev), |
| 268 | debugfs_root); |
| 269 | if (IS_ERR_OR_NULL(btt->debugfs_dir)) |
| 270 | return; |
| 271 | |
| 272 | list_for_each_entry(arena, &btt->arena_list, list) { |
| 273 | arena_debugfs_init(arena, btt->debugfs_dir, i); |
| 274 | i++; |
| 275 | } |
| 276 | } |
| 277 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 278 | static u32 log_seq(struct log_group *log, int log_idx) |
| 279 | { |
| 280 | return le32_to_cpu(log->ent[log_idx].seq); |
| 281 | } |
| 282 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 283 | /* |
| 284 | * This function accepts two log entries, and uses the |
| 285 | * sequence number to find the 'older' entry. |
| 286 | * It also updates the sequence number in this old entry to |
| 287 | * make it the 'new' one if the mark_flag is set. |
| 288 | * Finally, it returns which of the entries was the older one. |
| 289 | * |
| 290 | * TODO The logic feels a bit kludge-y. make it better.. |
| 291 | */ |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 292 | static int btt_log_get_old(struct arena_info *a, struct log_group *log) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 293 | { |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 294 | int idx0 = a->log_index[0]; |
| 295 | int idx1 = a->log_index[1]; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 296 | int old; |
| 297 | |
| 298 | /* |
| 299 | * the first ever time this is seen, the entry goes into [0] |
| 300 | * the next time, the following logic works out to put this |
| 301 | * (next) entry into [1] |
| 302 | */ |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 303 | if (log_seq(log, idx0) == 0) { |
| 304 | log->ent[idx0].seq = cpu_to_le32(1); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 305 | return 0; |
| 306 | } |
| 307 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 308 | if (log_seq(log, idx0) == log_seq(log, idx1)) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 309 | return -EINVAL; |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 310 | if (log_seq(log, idx0) + log_seq(log, idx1) > 5) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 311 | return -EINVAL; |
| 312 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 313 | if (log_seq(log, idx0) < log_seq(log, idx1)) { |
| 314 | if ((log_seq(log, idx1) - log_seq(log, idx0)) == 1) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 315 | old = 0; |
| 316 | else |
| 317 | old = 1; |
| 318 | } else { |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 319 | if ((log_seq(log, idx0) - log_seq(log, idx1)) == 1) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 320 | old = 1; |
| 321 | else |
| 322 | old = 0; |
| 323 | } |
| 324 | |
| 325 | return old; |
| 326 | } |
| 327 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 328 | /* |
| 329 | * This function copies the desired (old/new) log entry into ent if |
| 330 | * it is not NULL. It returns the sub-slot number (0 or 1) |
| 331 | * where the desired log entry was found. Negative return values |
| 332 | * indicate errors. |
| 333 | */ |
| 334 | static int btt_log_read(struct arena_info *arena, u32 lane, |
| 335 | struct log_entry *ent, int old_flag) |
| 336 | { |
| 337 | int ret; |
| 338 | int old_ent, ret_ent; |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 339 | struct log_group log; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 340 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 341 | ret = btt_log_group_read(arena, lane, &log); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 342 | if (ret) |
| 343 | return -EIO; |
| 344 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 345 | old_ent = btt_log_get_old(arena, &log); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 346 | if (old_ent < 0 || old_ent > 1) { |
Vishal Verma | e6be2dc | 2017-06-30 18:32:51 -0600 | [diff] [blame] | 347 | dev_err(to_dev(arena), |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 348 | "log corruption (%d): lane %d seq [%d, %d]\n", |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 349 | old_ent, lane, log.ent[arena->log_index[0]].seq, |
| 350 | log.ent[arena->log_index[1]].seq); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 351 | /* TODO set error state? */ |
| 352 | return -EIO; |
| 353 | } |
| 354 | |
| 355 | ret_ent = (old_flag ? old_ent : (1 - old_ent)); |
| 356 | |
| 357 | if (ent != NULL) |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 358 | memcpy(ent, &log.ent[arena->log_index[ret_ent]], LOG_ENT_SIZE); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 359 | |
| 360 | return ret_ent; |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * This function commits a log entry to media |
| 365 | * It does _not_ prepare the freelist entry for the next write |
| 366 | * btt_flog_write is the wrapper for updating the freelist elements |
| 367 | */ |
| 368 | static int __btt_log_write(struct arena_info *arena, u32 lane, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 369 | u32 sub, struct log_entry *ent, unsigned long flags) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 370 | { |
| 371 | int ret; |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 372 | u32 group_slot = arena->log_index[sub]; |
| 373 | unsigned int log_half = LOG_ENT_SIZE / 2; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 374 | void *src = ent; |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 375 | u64 ns_off; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 376 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 377 | ns_off = arena->logoff + (lane * LOG_GRP_SIZE) + |
| 378 | (group_slot * LOG_ENT_SIZE); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 379 | /* split the 16B write into atomic, durable halves */ |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 380 | ret = arena_write_bytes(arena, ns_off, src, log_half, flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 381 | if (ret) |
| 382 | return ret; |
| 383 | |
| 384 | ns_off += log_half; |
| 385 | src += log_half; |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 386 | return arena_write_bytes(arena, ns_off, src, log_half, flags); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub, |
| 390 | struct log_entry *ent) |
| 391 | { |
| 392 | int ret; |
| 393 | |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 394 | ret = __btt_log_write(arena, lane, sub, ent, NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 395 | if (ret) |
| 396 | return ret; |
| 397 | |
| 398 | /* prepare the next free entry */ |
| 399 | arena->freelist[lane].sub = 1 - arena->freelist[lane].sub; |
| 400 | if (++(arena->freelist[lane].seq) == 4) |
| 401 | arena->freelist[lane].seq = 1; |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 402 | if (ent_e_flag(ent->old_map)) |
| 403 | arena->freelist[lane].has_err = 1; |
| 404 | arena->freelist[lane].block = le32_to_cpu(ent_lba(ent->old_map)); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 405 | |
| 406 | return ret; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * This function initializes the BTT map to the initial state, which is |
| 411 | * all-zeroes, and indicates an identity mapping |
| 412 | */ |
| 413 | static int btt_map_init(struct arena_info *arena) |
| 414 | { |
| 415 | int ret = -EINVAL; |
| 416 | void *zerobuf; |
| 417 | size_t offset = 0; |
| 418 | size_t chunk_size = SZ_2M; |
| 419 | size_t mapsize = arena->logoff - arena->mapoff; |
| 420 | |
| 421 | zerobuf = kzalloc(chunk_size, GFP_KERNEL); |
| 422 | if (!zerobuf) |
| 423 | return -ENOMEM; |
| 424 | |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 425 | /* |
| 426 | * mapoff should always be at least 512B aligned. We rely on that to |
| 427 | * make sure rw_bytes does error clearing correctly, so make sure that |
| 428 | * is the case. |
| 429 | */ |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 430 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->mapoff, 512), |
| 431 | "arena->mapoff: %#llx is unaligned\n", arena->mapoff); |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 432 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 433 | while (mapsize) { |
| 434 | size_t size = min(mapsize, chunk_size); |
| 435 | |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 436 | dev_WARN_ONCE(to_dev(arena), size < 512, |
Randy Dunlap | 04c3c98 | 2017-09-08 09:36:57 -0700 | [diff] [blame] | 437 | "chunk size: %#zx is unaligned\n", size); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 438 | ret = arena_write_bytes(arena, arena->mapoff + offset, zerobuf, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 439 | size, 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 440 | if (ret) |
| 441 | goto free; |
| 442 | |
| 443 | offset += size; |
| 444 | mapsize -= size; |
| 445 | cond_resched(); |
| 446 | } |
| 447 | |
| 448 | free: |
| 449 | kfree(zerobuf); |
| 450 | return ret; |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * This function initializes the BTT log with 'fake' entries pointing |
| 455 | * to the initial reserved set of blocks as being free |
| 456 | */ |
| 457 | static int btt_log_init(struct arena_info *arena) |
| 458 | { |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 459 | size_t logsize = arena->info2off - arena->logoff; |
| 460 | size_t chunk_size = SZ_4K, offset = 0; |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 461 | struct log_entry ent; |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 462 | void *zerobuf; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 463 | int ret; |
| 464 | u32 i; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 465 | |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 466 | zerobuf = kzalloc(chunk_size, GFP_KERNEL); |
| 467 | if (!zerobuf) |
| 468 | return -ENOMEM; |
| 469 | /* |
| 470 | * logoff should always be at least 512B aligned. We rely on that to |
| 471 | * make sure rw_bytes does error clearing correctly, so make sure that |
| 472 | * is the case. |
| 473 | */ |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 474 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->logoff, 512), |
| 475 | "arena->logoff: %#llx is unaligned\n", arena->logoff); |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 476 | |
| 477 | while (logsize) { |
| 478 | size_t size = min(logsize, chunk_size); |
| 479 | |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 480 | dev_WARN_ONCE(to_dev(arena), size < 512, |
Randy Dunlap | 04c3c98 | 2017-09-08 09:36:57 -0700 | [diff] [blame] | 481 | "chunk size: %#zx is unaligned\n", size); |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 482 | ret = arena_write_bytes(arena, arena->logoff + offset, zerobuf, |
| 483 | size, 0); |
| 484 | if (ret) |
| 485 | goto free; |
| 486 | |
| 487 | offset += size; |
| 488 | logsize -= size; |
| 489 | cond_resched(); |
| 490 | } |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 491 | |
| 492 | for (i = 0; i < arena->nfree; i++) { |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 493 | ent.lba = cpu_to_le32(i); |
| 494 | ent.old_map = cpu_to_le32(arena->external_nlba + i); |
| 495 | ent.new_map = cpu_to_le32(arena->external_nlba + i); |
| 496 | ent.seq = cpu_to_le32(LOG_SEQ_INIT); |
| 497 | ret = __btt_log_write(arena, i, 0, &ent, 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 498 | if (ret) |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 499 | goto free; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 500 | } |
| 501 | |
Vishal Verma | b177fe8 | 2017-05-10 15:01:31 -0600 | [diff] [blame] | 502 | free: |
| 503 | kfree(zerobuf); |
| 504 | return ret; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 505 | } |
| 506 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 507 | static u64 to_namespace_offset(struct arena_info *arena, u64 lba) |
| 508 | { |
| 509 | return arena->dataoff + ((u64)lba * arena->internal_lbasize); |
| 510 | } |
| 511 | |
| 512 | static int arena_clear_freelist_error(struct arena_info *arena, u32 lane) |
| 513 | { |
| 514 | int ret = 0; |
| 515 | |
| 516 | if (arena->freelist[lane].has_err) { |
| 517 | void *zero_page = page_address(ZERO_PAGE(0)); |
| 518 | u32 lba = arena->freelist[lane].block; |
| 519 | u64 nsoff = to_namespace_offset(arena, lba); |
| 520 | unsigned long len = arena->sector_size; |
| 521 | |
| 522 | mutex_lock(&arena->err_lock); |
| 523 | |
| 524 | while (len) { |
| 525 | unsigned long chunk = min(len, PAGE_SIZE); |
| 526 | |
| 527 | ret = arena_write_bytes(arena, nsoff, zero_page, |
| 528 | chunk, 0); |
| 529 | if (ret) |
| 530 | break; |
| 531 | len -= chunk; |
| 532 | nsoff += chunk; |
| 533 | if (len == 0) |
| 534 | arena->freelist[lane].has_err = 0; |
| 535 | } |
| 536 | mutex_unlock(&arena->err_lock); |
| 537 | } |
| 538 | return ret; |
| 539 | } |
| 540 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 541 | static int btt_freelist_init(struct arena_info *arena) |
| 542 | { |
| 543 | int old, new, ret; |
| 544 | u32 i, map_entry; |
| 545 | struct log_entry log_new, log_old; |
| 546 | |
| 547 | arena->freelist = kcalloc(arena->nfree, sizeof(struct free_entry), |
| 548 | GFP_KERNEL); |
| 549 | if (!arena->freelist) |
| 550 | return -ENOMEM; |
| 551 | |
| 552 | for (i = 0; i < arena->nfree; i++) { |
| 553 | old = btt_log_read(arena, i, &log_old, LOG_OLD_ENT); |
| 554 | if (old < 0) |
| 555 | return old; |
| 556 | |
| 557 | new = btt_log_read(arena, i, &log_new, LOG_NEW_ENT); |
| 558 | if (new < 0) |
| 559 | return new; |
| 560 | |
| 561 | /* sub points to the next one to be overwritten */ |
| 562 | arena->freelist[i].sub = 1 - new; |
| 563 | arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq)); |
| 564 | arena->freelist[i].block = le32_to_cpu(log_new.old_map); |
| 565 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 566 | /* |
| 567 | * FIXME: if error clearing fails during init, we want to make |
| 568 | * the BTT read-only |
| 569 | */ |
| 570 | if (ent_e_flag(log_new.old_map)) { |
| 571 | ret = arena_clear_freelist_error(arena, i); |
| 572 | if (ret) |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 573 | dev_err_ratelimited(to_dev(arena), |
| 574 | "Unable to clear known errors\n"); |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 575 | } |
| 576 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 577 | /* This implies a newly created or untouched flog entry */ |
| 578 | if (log_new.old_map == log_new.new_map) |
| 579 | continue; |
| 580 | |
| 581 | /* Check if map recovery is needed */ |
| 582 | ret = btt_map_read(arena, le32_to_cpu(log_new.lba), &map_entry, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 583 | NULL, NULL, 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 584 | if (ret) |
| 585 | return ret; |
| 586 | if ((le32_to_cpu(log_new.new_map) != map_entry) && |
| 587 | (le32_to_cpu(log_new.old_map) == map_entry)) { |
| 588 | /* |
| 589 | * Last transaction wrote the flog, but wasn't able |
| 590 | * to complete the map write. So fix up the map. |
| 591 | */ |
| 592 | ret = btt_map_write(arena, le32_to_cpu(log_new.lba), |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 593 | le32_to_cpu(log_new.new_map), 0, 0, 0); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 594 | if (ret) |
| 595 | return ret; |
| 596 | } |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | return 0; |
| 600 | } |
| 601 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 602 | static bool ent_is_padding(struct log_entry *ent) |
| 603 | { |
| 604 | return (ent->lba == 0) && (ent->old_map == 0) && (ent->new_map == 0) |
| 605 | && (ent->seq == 0); |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * Detecting valid log indices: We read a log group (see the comments in btt.h |
| 610 | * for a description of a 'log_group' and its 'slots'), and iterate over its |
| 611 | * four slots. We expect that a padding slot will be all-zeroes, and use this |
| 612 | * to detect a padding slot vs. an actual entry. |
| 613 | * |
| 614 | * If a log_group is in the initial state, i.e. hasn't been used since the |
| 615 | * creation of this BTT layout, it will have three of the four slots with |
| 616 | * zeroes. We skip over these log_groups for the detection of log_index. If |
| 617 | * all log_groups are in the initial state (i.e. the BTT has never been |
| 618 | * written to), it is safe to assume the 'new format' of log entries in slots |
| 619 | * (0, 1). |
| 620 | */ |
| 621 | static int log_set_indices(struct arena_info *arena) |
| 622 | { |
| 623 | bool idx_set = false, initial_state = true; |
| 624 | int ret, log_index[2] = {-1, -1}; |
| 625 | u32 i, j, next_idx = 0; |
| 626 | struct log_group log; |
| 627 | u32 pad_count = 0; |
| 628 | |
| 629 | for (i = 0; i < arena->nfree; i++) { |
| 630 | ret = btt_log_group_read(arena, i, &log); |
| 631 | if (ret < 0) |
| 632 | return ret; |
| 633 | |
| 634 | for (j = 0; j < 4; j++) { |
| 635 | if (!idx_set) { |
| 636 | if (ent_is_padding(&log.ent[j])) { |
| 637 | pad_count++; |
| 638 | continue; |
| 639 | } else { |
| 640 | /* Skip if index has been recorded */ |
| 641 | if ((next_idx == 1) && |
| 642 | (j == log_index[0])) |
| 643 | continue; |
| 644 | /* valid entry, record index */ |
| 645 | log_index[next_idx] = j; |
| 646 | next_idx++; |
| 647 | } |
| 648 | if (next_idx == 2) { |
| 649 | /* two valid entries found */ |
| 650 | idx_set = true; |
| 651 | } else if (next_idx > 2) { |
| 652 | /* too many valid indices */ |
| 653 | return -ENXIO; |
| 654 | } |
| 655 | } else { |
| 656 | /* |
| 657 | * once the indices have been set, just verify |
| 658 | * that all subsequent log groups are either in |
| 659 | * their initial state or follow the same |
| 660 | * indices. |
| 661 | */ |
| 662 | if (j == log_index[0]) { |
| 663 | /* entry must be 'valid' */ |
| 664 | if (ent_is_padding(&log.ent[j])) |
| 665 | return -ENXIO; |
| 666 | } else if (j == log_index[1]) { |
| 667 | ; |
| 668 | /* |
| 669 | * log_index[1] can be padding if the |
| 670 | * lane never got used and it is still |
| 671 | * in the initial state (three 'padding' |
| 672 | * entries) |
| 673 | */ |
| 674 | } else { |
| 675 | /* entry must be invalid (padding) */ |
| 676 | if (!ent_is_padding(&log.ent[j])) |
| 677 | return -ENXIO; |
| 678 | } |
| 679 | } |
| 680 | } |
| 681 | /* |
| 682 | * If any of the log_groups have more than one valid, |
| 683 | * non-padding entry, then the we are no longer in the |
| 684 | * initial_state |
| 685 | */ |
| 686 | if (pad_count < 3) |
| 687 | initial_state = false; |
| 688 | pad_count = 0; |
| 689 | } |
| 690 | |
| 691 | if (!initial_state && !idx_set) |
| 692 | return -ENXIO; |
| 693 | |
| 694 | /* |
| 695 | * If all the entries in the log were in the initial state, |
| 696 | * assume new padding scheme |
| 697 | */ |
| 698 | if (initial_state) |
| 699 | log_index[1] = 1; |
| 700 | |
| 701 | /* |
| 702 | * Only allow the known permutations of log/padding indices, |
| 703 | * i.e. (0, 1), and (0, 2) |
| 704 | */ |
| 705 | if ((log_index[0] == 0) && ((log_index[1] == 1) || (log_index[1] == 2))) |
| 706 | ; /* known index possibilities */ |
| 707 | else { |
| 708 | dev_err(to_dev(arena), "Found an unknown padding scheme\n"); |
| 709 | return -ENXIO; |
| 710 | } |
| 711 | |
| 712 | arena->log_index[0] = log_index[0]; |
| 713 | arena->log_index[1] = log_index[1]; |
| 714 | dev_dbg(to_dev(arena), "log_index_0 = %d\n", log_index[0]); |
| 715 | dev_dbg(to_dev(arena), "log_index_1 = %d\n", log_index[1]); |
| 716 | return 0; |
| 717 | } |
| 718 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 719 | static int btt_rtt_init(struct arena_info *arena) |
| 720 | { |
| 721 | arena->rtt = kcalloc(arena->nfree, sizeof(u32), GFP_KERNEL); |
| 722 | if (arena->rtt == NULL) |
| 723 | return -ENOMEM; |
| 724 | |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | static int btt_maplocks_init(struct arena_info *arena) |
| 729 | { |
| 730 | u32 i; |
| 731 | |
| 732 | arena->map_locks = kcalloc(arena->nfree, sizeof(struct aligned_lock), |
| 733 | GFP_KERNEL); |
| 734 | if (!arena->map_locks) |
| 735 | return -ENOMEM; |
| 736 | |
| 737 | for (i = 0; i < arena->nfree; i++) |
| 738 | spin_lock_init(&arena->map_locks[i].lock); |
| 739 | |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | static struct arena_info *alloc_arena(struct btt *btt, size_t size, |
| 744 | size_t start, size_t arena_off) |
| 745 | { |
| 746 | struct arena_info *arena; |
| 747 | u64 logsize, mapsize, datasize; |
| 748 | u64 available = size; |
| 749 | |
| 750 | arena = kzalloc(sizeof(struct arena_info), GFP_KERNEL); |
| 751 | if (!arena) |
| 752 | return NULL; |
| 753 | arena->nd_btt = btt->nd_btt; |
Vishal Verma | 7589200 | 2017-08-30 19:36:01 -0600 | [diff] [blame] | 754 | arena->sector_size = btt->sector_size; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 755 | |
| 756 | if (!size) |
| 757 | return arena; |
| 758 | |
| 759 | arena->size = size; |
| 760 | arena->external_lba_start = start; |
| 761 | arena->external_lbasize = btt->lbasize; |
| 762 | arena->internal_lbasize = roundup(arena->external_lbasize, |
| 763 | INT_LBASIZE_ALIGNMENT); |
| 764 | arena->nfree = BTT_DEFAULT_NFREE; |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 765 | arena->version_major = btt->nd_btt->version_major; |
| 766 | arena->version_minor = btt->nd_btt->version_minor; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 767 | |
| 768 | if (available % BTT_PG_SIZE) |
| 769 | available -= (available % BTT_PG_SIZE); |
| 770 | |
| 771 | /* Two pages are reserved for the super block and its copy */ |
| 772 | available -= 2 * BTT_PG_SIZE; |
| 773 | |
| 774 | /* The log takes a fixed amount of space based on nfree */ |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 775 | logsize = roundup(arena->nfree * LOG_GRP_SIZE, BTT_PG_SIZE); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 776 | available -= logsize; |
| 777 | |
| 778 | /* Calculate optimal split between map and data area */ |
| 779 | arena->internal_nlba = div_u64(available - BTT_PG_SIZE, |
| 780 | arena->internal_lbasize + MAP_ENT_SIZE); |
| 781 | arena->external_nlba = arena->internal_nlba - arena->nfree; |
| 782 | |
| 783 | mapsize = roundup((arena->external_nlba * MAP_ENT_SIZE), BTT_PG_SIZE); |
| 784 | datasize = available - mapsize; |
| 785 | |
| 786 | /* 'Absolute' values, relative to start of storage space */ |
| 787 | arena->infooff = arena_off; |
| 788 | arena->dataoff = arena->infooff + BTT_PG_SIZE; |
| 789 | arena->mapoff = arena->dataoff + datasize; |
| 790 | arena->logoff = arena->mapoff + mapsize; |
| 791 | arena->info2off = arena->logoff + logsize; |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 792 | |
| 793 | /* Default log indices are (0,1) */ |
| 794 | arena->log_index[0] = 0; |
| 795 | arena->log_index[1] = 1; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 796 | return arena; |
| 797 | } |
| 798 | |
| 799 | static void free_arenas(struct btt *btt) |
| 800 | { |
| 801 | struct arena_info *arena, *next; |
| 802 | |
| 803 | list_for_each_entry_safe(arena, next, &btt->arena_list, list) { |
| 804 | list_del(&arena->list); |
| 805 | kfree(arena->rtt); |
| 806 | kfree(arena->map_locks); |
| 807 | kfree(arena->freelist); |
| 808 | debugfs_remove_recursive(arena->debugfs_dir); |
| 809 | kfree(arena); |
| 810 | } |
| 811 | } |
| 812 | |
| 813 | /* |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 814 | * This function reads an existing valid btt superblock and |
| 815 | * populates the corresponding arena_info struct |
| 816 | */ |
| 817 | static void parse_arena_meta(struct arena_info *arena, struct btt_sb *super, |
| 818 | u64 arena_off) |
| 819 | { |
| 820 | arena->internal_nlba = le32_to_cpu(super->internal_nlba); |
| 821 | arena->internal_lbasize = le32_to_cpu(super->internal_lbasize); |
| 822 | arena->external_nlba = le32_to_cpu(super->external_nlba); |
| 823 | arena->external_lbasize = le32_to_cpu(super->external_lbasize); |
| 824 | arena->nfree = le32_to_cpu(super->nfree); |
| 825 | arena->version_major = le16_to_cpu(super->version_major); |
| 826 | arena->version_minor = le16_to_cpu(super->version_minor); |
| 827 | |
| 828 | arena->nextoff = (super->nextoff == 0) ? 0 : (arena_off + |
| 829 | le64_to_cpu(super->nextoff)); |
| 830 | arena->infooff = arena_off; |
| 831 | arena->dataoff = arena_off + le64_to_cpu(super->dataoff); |
| 832 | arena->mapoff = arena_off + le64_to_cpu(super->mapoff); |
| 833 | arena->logoff = arena_off + le64_to_cpu(super->logoff); |
| 834 | arena->info2off = arena_off + le64_to_cpu(super->info2off); |
| 835 | |
Dan Williams | 5e32940 | 2015-07-11 10:02:46 -0400 | [diff] [blame] | 836 | arena->size = (le64_to_cpu(super->nextoff) > 0) |
| 837 | ? (le64_to_cpu(super->nextoff)) |
| 838 | : (arena->info2off - arena->infooff + BTT_PG_SIZE); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 839 | |
| 840 | arena->flags = le32_to_cpu(super->flags); |
| 841 | } |
| 842 | |
| 843 | static int discover_arenas(struct btt *btt) |
| 844 | { |
| 845 | int ret = 0; |
| 846 | struct arena_info *arena; |
| 847 | struct btt_sb *super; |
| 848 | size_t remaining = btt->rawsize; |
| 849 | u64 cur_nlba = 0; |
| 850 | size_t cur_off = 0; |
| 851 | int num_arenas = 0; |
| 852 | |
| 853 | super = kzalloc(sizeof(*super), GFP_KERNEL); |
| 854 | if (!super) |
| 855 | return -ENOMEM; |
| 856 | |
| 857 | while (remaining) { |
| 858 | /* Alloc memory for arena */ |
| 859 | arena = alloc_arena(btt, 0, 0, 0); |
| 860 | if (!arena) { |
| 861 | ret = -ENOMEM; |
| 862 | goto out_super; |
| 863 | } |
| 864 | |
| 865 | arena->infooff = cur_off; |
| 866 | ret = btt_info_read(arena, super); |
| 867 | if (ret) |
| 868 | goto out; |
| 869 | |
Vishal Verma | ab45e76 | 2015-07-29 14:58:08 -0600 | [diff] [blame] | 870 | if (!nd_btt_arena_is_valid(btt->nd_btt, super)) { |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 871 | if (remaining == btt->rawsize) { |
| 872 | btt->init_state = INIT_NOTFOUND; |
| 873 | dev_info(to_dev(arena), "No existing arenas\n"); |
| 874 | goto out; |
| 875 | } else { |
Vishal Verma | e6be2dc | 2017-06-30 18:32:51 -0600 | [diff] [blame] | 876 | dev_err(to_dev(arena), |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 877 | "Found corrupted metadata!\n"); |
| 878 | ret = -ENODEV; |
| 879 | goto out; |
| 880 | } |
| 881 | } |
| 882 | |
| 883 | arena->external_lba_start = cur_nlba; |
| 884 | parse_arena_meta(arena, super, cur_off); |
| 885 | |
Vishal Verma | 166f39b | 2017-12-18 09:28:39 -0700 | [diff] [blame] | 886 | ret = log_set_indices(arena); |
| 887 | if (ret) { |
| 888 | dev_err(to_dev(arena), |
| 889 | "Unable to deduce log/padding indices\n"); |
| 890 | goto out; |
| 891 | } |
| 892 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 893 | mutex_init(&arena->err_lock); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 894 | ret = btt_freelist_init(arena); |
| 895 | if (ret) |
| 896 | goto out; |
| 897 | |
| 898 | ret = btt_rtt_init(arena); |
| 899 | if (ret) |
| 900 | goto out; |
| 901 | |
| 902 | ret = btt_maplocks_init(arena); |
| 903 | if (ret) |
| 904 | goto out; |
| 905 | |
| 906 | list_add_tail(&arena->list, &btt->arena_list); |
| 907 | |
| 908 | remaining -= arena->size; |
| 909 | cur_off += arena->size; |
| 910 | cur_nlba += arena->external_nlba; |
| 911 | num_arenas++; |
| 912 | |
| 913 | if (arena->nextoff == 0) |
| 914 | break; |
| 915 | } |
| 916 | btt->num_arenas = num_arenas; |
| 917 | btt->nlba = cur_nlba; |
| 918 | btt->init_state = INIT_READY; |
| 919 | |
| 920 | kfree(super); |
| 921 | return ret; |
| 922 | |
| 923 | out: |
| 924 | kfree(arena); |
| 925 | free_arenas(btt); |
| 926 | out_super: |
| 927 | kfree(super); |
| 928 | return ret; |
| 929 | } |
| 930 | |
| 931 | static int create_arenas(struct btt *btt) |
| 932 | { |
| 933 | size_t remaining = btt->rawsize; |
| 934 | size_t cur_off = 0; |
| 935 | |
| 936 | while (remaining) { |
| 937 | struct arena_info *arena; |
| 938 | size_t arena_size = min_t(u64, ARENA_MAX_SIZE, remaining); |
| 939 | |
| 940 | remaining -= arena_size; |
| 941 | if (arena_size < ARENA_MIN_SIZE) |
| 942 | break; |
| 943 | |
| 944 | arena = alloc_arena(btt, arena_size, btt->nlba, cur_off); |
| 945 | if (!arena) { |
| 946 | free_arenas(btt); |
| 947 | return -ENOMEM; |
| 948 | } |
| 949 | btt->nlba += arena->external_nlba; |
| 950 | if (remaining >= ARENA_MIN_SIZE) |
| 951 | arena->nextoff = arena->size; |
| 952 | else |
| 953 | arena->nextoff = 0; |
| 954 | cur_off += arena_size; |
| 955 | list_add_tail(&arena->list, &btt->arena_list); |
| 956 | } |
| 957 | |
| 958 | return 0; |
| 959 | } |
| 960 | |
| 961 | /* |
| 962 | * This function completes arena initialization by writing |
| 963 | * all the metadata. |
| 964 | * It is only called for an uninitialized arena when a write |
| 965 | * to that arena occurs for the first time. |
| 966 | */ |
Vishal Verma | fbde141 | 2015-07-29 14:58:07 -0600 | [diff] [blame] | 967 | static int btt_arena_write_layout(struct arena_info *arena) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 968 | { |
| 969 | int ret; |
Dan Williams | e145574 | 2015-07-30 17:57:47 -0400 | [diff] [blame] | 970 | u64 sum; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 971 | struct btt_sb *super; |
Vishal Verma | fbde141 | 2015-07-29 14:58:07 -0600 | [diff] [blame] | 972 | struct nd_btt *nd_btt = arena->nd_btt; |
Vishal Verma | 6ec6895 | 2015-07-29 14:58:09 -0600 | [diff] [blame] | 973 | const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 974 | |
| 975 | ret = btt_map_init(arena); |
| 976 | if (ret) |
| 977 | return ret; |
| 978 | |
| 979 | ret = btt_log_init(arena); |
| 980 | if (ret) |
| 981 | return ret; |
| 982 | |
| 983 | super = kzalloc(sizeof(struct btt_sb), GFP_NOIO); |
| 984 | if (!super) |
| 985 | return -ENOMEM; |
| 986 | |
| 987 | strncpy(super->signature, BTT_SIG, BTT_SIG_LEN); |
Vishal Verma | fbde141 | 2015-07-29 14:58:07 -0600 | [diff] [blame] | 988 | memcpy(super->uuid, nd_btt->uuid, 16); |
Vishal Verma | 6ec6895 | 2015-07-29 14:58:09 -0600 | [diff] [blame] | 989 | memcpy(super->parent_uuid, parent_uuid, 16); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 990 | super->flags = cpu_to_le32(arena->flags); |
| 991 | super->version_major = cpu_to_le16(arena->version_major); |
| 992 | super->version_minor = cpu_to_le16(arena->version_minor); |
| 993 | super->external_lbasize = cpu_to_le32(arena->external_lbasize); |
| 994 | super->external_nlba = cpu_to_le32(arena->external_nlba); |
| 995 | super->internal_lbasize = cpu_to_le32(arena->internal_lbasize); |
| 996 | super->internal_nlba = cpu_to_le32(arena->internal_nlba); |
| 997 | super->nfree = cpu_to_le32(arena->nfree); |
| 998 | super->infosize = cpu_to_le32(sizeof(struct btt_sb)); |
| 999 | super->nextoff = cpu_to_le64(arena->nextoff); |
| 1000 | /* |
| 1001 | * Subtract arena->infooff (arena start) so numbers are relative |
| 1002 | * to 'this' arena |
| 1003 | */ |
| 1004 | super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff); |
| 1005 | super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff); |
| 1006 | super->logoff = cpu_to_le64(arena->logoff - arena->infooff); |
| 1007 | super->info2off = cpu_to_le64(arena->info2off - arena->infooff); |
| 1008 | |
| 1009 | super->flags = 0; |
Dan Williams | e145574 | 2015-07-30 17:57:47 -0400 | [diff] [blame] | 1010 | sum = nd_sb_checksum((struct nd_gen_sb *) super); |
| 1011 | super->checksum = cpu_to_le64(sum); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1012 | |
| 1013 | ret = btt_info_write(arena, super); |
| 1014 | |
| 1015 | kfree(super); |
| 1016 | return ret; |
| 1017 | } |
| 1018 | |
| 1019 | /* |
| 1020 | * This function completes the initialization for the BTT namespace |
| 1021 | * such that it is ready to accept IOs |
| 1022 | */ |
| 1023 | static int btt_meta_init(struct btt *btt) |
| 1024 | { |
| 1025 | int ret = 0; |
| 1026 | struct arena_info *arena; |
| 1027 | |
| 1028 | mutex_lock(&btt->init_lock); |
| 1029 | list_for_each_entry(arena, &btt->arena_list, list) { |
Vishal Verma | fbde141 | 2015-07-29 14:58:07 -0600 | [diff] [blame] | 1030 | ret = btt_arena_write_layout(arena); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1031 | if (ret) |
| 1032 | goto unlock; |
| 1033 | |
| 1034 | ret = btt_freelist_init(arena); |
| 1035 | if (ret) |
| 1036 | goto unlock; |
| 1037 | |
| 1038 | ret = btt_rtt_init(arena); |
| 1039 | if (ret) |
| 1040 | goto unlock; |
| 1041 | |
| 1042 | ret = btt_maplocks_init(arena); |
| 1043 | if (ret) |
| 1044 | goto unlock; |
| 1045 | } |
| 1046 | |
| 1047 | btt->init_state = INIT_READY; |
| 1048 | |
| 1049 | unlock: |
| 1050 | mutex_unlock(&btt->init_lock); |
| 1051 | return ret; |
| 1052 | } |
| 1053 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1054 | static u32 btt_meta_size(struct btt *btt) |
| 1055 | { |
| 1056 | return btt->lbasize - btt->sector_size; |
| 1057 | } |
| 1058 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1059 | /* |
| 1060 | * This function calculates the arena in which the given LBA lies |
| 1061 | * by doing a linear walk. This is acceptable since we expect only |
| 1062 | * a few arenas. If we have backing devices that get much larger, |
| 1063 | * we can construct a balanced binary tree of arenas at init time |
| 1064 | * so that this range search becomes faster. |
| 1065 | */ |
| 1066 | static int lba_to_arena(struct btt *btt, sector_t sector, __u32 *premap, |
| 1067 | struct arena_info **arena) |
| 1068 | { |
| 1069 | struct arena_info *arena_list; |
| 1070 | __u64 lba = div_u64(sector << SECTOR_SHIFT, btt->sector_size); |
| 1071 | |
| 1072 | list_for_each_entry(arena_list, &btt->arena_list, list) { |
| 1073 | if (lba < arena_list->external_nlba) { |
| 1074 | *arena = arena_list; |
| 1075 | *premap = lba; |
| 1076 | return 0; |
| 1077 | } |
| 1078 | lba -= arena_list->external_nlba; |
| 1079 | } |
| 1080 | |
| 1081 | return -EIO; |
| 1082 | } |
| 1083 | |
| 1084 | /* |
| 1085 | * The following (lock_map, unlock_map) are mostly just to improve |
| 1086 | * readability, since they index into an array of locks |
| 1087 | */ |
| 1088 | static void lock_map(struct arena_info *arena, u32 premap) |
| 1089 | __acquires(&arena->map_locks[idx].lock) |
| 1090 | { |
| 1091 | u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; |
| 1092 | |
| 1093 | spin_lock(&arena->map_locks[idx].lock); |
| 1094 | } |
| 1095 | |
| 1096 | static void unlock_map(struct arena_info *arena, u32 premap) |
| 1097 | __releases(&arena->map_locks[idx].lock) |
| 1098 | { |
| 1099 | u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; |
| 1100 | |
| 1101 | spin_unlock(&arena->map_locks[idx].lock); |
| 1102 | } |
| 1103 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1104 | static int btt_data_read(struct arena_info *arena, struct page *page, |
| 1105 | unsigned int off, u32 lba, u32 len) |
| 1106 | { |
| 1107 | int ret; |
| 1108 | u64 nsoff = to_namespace_offset(arena, lba); |
| 1109 | void *mem = kmap_atomic(page); |
| 1110 | |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 1111 | ret = arena_read_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1112 | kunmap_atomic(mem); |
| 1113 | |
| 1114 | return ret; |
| 1115 | } |
| 1116 | |
| 1117 | static int btt_data_write(struct arena_info *arena, u32 lba, |
| 1118 | struct page *page, unsigned int off, u32 len) |
| 1119 | { |
| 1120 | int ret; |
| 1121 | u64 nsoff = to_namespace_offset(arena, lba); |
| 1122 | void *mem = kmap_atomic(page); |
| 1123 | |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 1124 | ret = arena_write_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1125 | kunmap_atomic(mem); |
| 1126 | |
| 1127 | return ret; |
| 1128 | } |
| 1129 | |
| 1130 | static void zero_fill_data(struct page *page, unsigned int off, u32 len) |
| 1131 | { |
| 1132 | void *mem = kmap_atomic(page); |
| 1133 | |
| 1134 | memset(mem + off, 0, len); |
| 1135 | kunmap_atomic(mem); |
| 1136 | } |
| 1137 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1138 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
| 1139 | static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, |
| 1140 | struct arena_info *arena, u32 postmap, int rw) |
| 1141 | { |
| 1142 | unsigned int len = btt_meta_size(btt); |
| 1143 | u64 meta_nsoff; |
| 1144 | int ret = 0; |
| 1145 | |
| 1146 | if (bip == NULL) |
| 1147 | return 0; |
| 1148 | |
| 1149 | meta_nsoff = to_namespace_offset(arena, postmap) + btt->sector_size; |
| 1150 | |
| 1151 | while (len) { |
| 1152 | unsigned int cur_len; |
| 1153 | struct bio_vec bv; |
| 1154 | void *mem; |
| 1155 | |
| 1156 | bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); |
| 1157 | /* |
| 1158 | * The 'bv' obtained from bvec_iter_bvec has its .bv_len and |
| 1159 | * .bv_offset already adjusted for iter->bi_bvec_done, and we |
| 1160 | * can use those directly |
| 1161 | */ |
| 1162 | |
| 1163 | cur_len = min(len, bv.bv_len); |
| 1164 | mem = kmap_atomic(bv.bv_page); |
| 1165 | if (rw) |
| 1166 | ret = arena_write_bytes(arena, meta_nsoff, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 1167 | mem + bv.bv_offset, cur_len, |
| 1168 | NVDIMM_IO_ATOMIC); |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1169 | else |
| 1170 | ret = arena_read_bytes(arena, meta_nsoff, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 1171 | mem + bv.bv_offset, cur_len, |
| 1172 | NVDIMM_IO_ATOMIC); |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1173 | |
| 1174 | kunmap_atomic(mem); |
| 1175 | if (ret) |
| 1176 | return ret; |
| 1177 | |
| 1178 | len -= cur_len; |
| 1179 | meta_nsoff += cur_len; |
Dmitry Monakhov | b1fb2c5 | 2017-06-29 11:31:13 -0700 | [diff] [blame] | 1180 | if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len)) |
| 1181 | return -EIO; |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1182 | } |
| 1183 | |
| 1184 | return ret; |
| 1185 | } |
| 1186 | |
| 1187 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| 1188 | static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, |
| 1189 | struct arena_info *arena, u32 postmap, int rw) |
| 1190 | { |
| 1191 | return 0; |
| 1192 | } |
| 1193 | #endif |
| 1194 | |
| 1195 | static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip, |
| 1196 | struct page *page, unsigned int off, sector_t sector, |
| 1197 | unsigned int len) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1198 | { |
| 1199 | int ret = 0; |
| 1200 | int t_flag, e_flag; |
| 1201 | struct arena_info *arena = NULL; |
| 1202 | u32 lane = 0, premap, postmap; |
| 1203 | |
| 1204 | while (len) { |
| 1205 | u32 cur_len; |
| 1206 | |
| 1207 | lane = nd_region_acquire_lane(btt->nd_region); |
| 1208 | |
| 1209 | ret = lba_to_arena(btt, sector, &premap, &arena); |
| 1210 | if (ret) |
| 1211 | goto out_lane; |
| 1212 | |
| 1213 | cur_len = min(btt->sector_size, len); |
| 1214 | |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 1215 | ret = btt_map_read(arena, premap, &postmap, &t_flag, &e_flag, |
| 1216 | NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1217 | if (ret) |
| 1218 | goto out_lane; |
| 1219 | |
| 1220 | /* |
| 1221 | * We loop to make sure that the post map LBA didn't change |
| 1222 | * from under us between writing the RTT and doing the actual |
| 1223 | * read. |
| 1224 | */ |
| 1225 | while (1) { |
| 1226 | u32 new_map; |
Vishal Verma | 1398199 | 2017-08-30 19:36:00 -0600 | [diff] [blame] | 1227 | int new_t, new_e; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1228 | |
| 1229 | if (t_flag) { |
| 1230 | zero_fill_data(page, off, cur_len); |
| 1231 | goto out_lane; |
| 1232 | } |
| 1233 | |
| 1234 | if (e_flag) { |
| 1235 | ret = -EIO; |
| 1236 | goto out_lane; |
| 1237 | } |
| 1238 | |
| 1239 | arena->rtt[lane] = RTT_VALID | postmap; |
| 1240 | /* |
| 1241 | * Barrier to make sure this write is not reordered |
| 1242 | * to do the verification map_read before the RTT store |
| 1243 | */ |
| 1244 | barrier(); |
| 1245 | |
Vishal Verma | 1398199 | 2017-08-30 19:36:00 -0600 | [diff] [blame] | 1246 | ret = btt_map_read(arena, premap, &new_map, &new_t, |
| 1247 | &new_e, NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1248 | if (ret) |
| 1249 | goto out_rtt; |
| 1250 | |
Vishal Verma | 1398199 | 2017-08-30 19:36:00 -0600 | [diff] [blame] | 1251 | if ((postmap == new_map) && (t_flag == new_t) && |
| 1252 | (e_flag == new_e)) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1253 | break; |
| 1254 | |
| 1255 | postmap = new_map; |
Vishal Verma | 1398199 | 2017-08-30 19:36:00 -0600 | [diff] [blame] | 1256 | t_flag = new_t; |
| 1257 | e_flag = new_e; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1258 | } |
| 1259 | |
| 1260 | ret = btt_data_read(arena, page, off, postmap, cur_len); |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1261 | if (ret) { |
| 1262 | int rc; |
| 1263 | |
| 1264 | /* Media error - set the e_flag */ |
| 1265 | rc = btt_map_write(arena, premap, postmap, 0, 1, |
| 1266 | NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1267 | goto out_rtt; |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1268 | } |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1269 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1270 | if (bip) { |
| 1271 | ret = btt_rw_integrity(btt, bip, arena, postmap, READ); |
| 1272 | if (ret) |
| 1273 | goto out_rtt; |
| 1274 | } |
| 1275 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1276 | arena->rtt[lane] = RTT_INVALID; |
| 1277 | nd_region_release_lane(btt->nd_region, lane); |
| 1278 | |
| 1279 | len -= cur_len; |
| 1280 | off += cur_len; |
| 1281 | sector += btt->sector_size >> SECTOR_SHIFT; |
| 1282 | } |
| 1283 | |
| 1284 | return 0; |
| 1285 | |
| 1286 | out_rtt: |
| 1287 | arena->rtt[lane] = RTT_INVALID; |
| 1288 | out_lane: |
| 1289 | nd_region_release_lane(btt->nd_region, lane); |
| 1290 | return ret; |
| 1291 | } |
| 1292 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1293 | /* |
| 1294 | * Normally, arena_{read,write}_bytes will take care of the initial offset |
| 1295 | * adjustment, but in the case of btt_is_badblock, where we query is_bad_pmem, |
| 1296 | * we need the final, raw namespace offset here |
| 1297 | */ |
| 1298 | static bool btt_is_badblock(struct btt *btt, struct arena_info *arena, |
| 1299 | u32 postmap) |
| 1300 | { |
| 1301 | u64 nsoff = adjust_initial_offset(arena->nd_btt, |
| 1302 | to_namespace_offset(arena, postmap)); |
| 1303 | sector_t phys_sector = nsoff >> 9; |
| 1304 | |
| 1305 | return is_bad_pmem(btt->phys_bb, phys_sector, arena->internal_lbasize); |
| 1306 | } |
| 1307 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1308 | static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip, |
| 1309 | sector_t sector, struct page *page, unsigned int off, |
| 1310 | unsigned int len) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1311 | { |
| 1312 | int ret = 0; |
| 1313 | struct arena_info *arena = NULL; |
| 1314 | u32 premap = 0, old_postmap, new_postmap, lane = 0, i; |
| 1315 | struct log_entry log; |
| 1316 | int sub; |
| 1317 | |
| 1318 | while (len) { |
| 1319 | u32 cur_len; |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1320 | int e_flag; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1321 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1322 | retry: |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1323 | lane = nd_region_acquire_lane(btt->nd_region); |
| 1324 | |
| 1325 | ret = lba_to_arena(btt, sector, &premap, &arena); |
| 1326 | if (ret) |
| 1327 | goto out_lane; |
| 1328 | cur_len = min(btt->sector_size, len); |
| 1329 | |
| 1330 | if ((arena->flags & IB_FLAG_ERROR_MASK) != 0) { |
| 1331 | ret = -EIO; |
| 1332 | goto out_lane; |
| 1333 | } |
| 1334 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1335 | if (btt_is_badblock(btt, arena, arena->freelist[lane].block)) |
| 1336 | arena->freelist[lane].has_err = 1; |
| 1337 | |
| 1338 | if (mutex_is_locked(&arena->err_lock) |
| 1339 | || arena->freelist[lane].has_err) { |
| 1340 | nd_region_release_lane(btt->nd_region, lane); |
| 1341 | |
| 1342 | ret = arena_clear_freelist_error(arena, lane); |
| 1343 | if (ret) |
| 1344 | return ret; |
| 1345 | |
| 1346 | /* OK to acquire a different lane/free block */ |
| 1347 | goto retry; |
| 1348 | } |
| 1349 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1350 | new_postmap = arena->freelist[lane].block; |
| 1351 | |
| 1352 | /* Wait if the new block is being read from */ |
| 1353 | for (i = 0; i < arena->nfree; i++) |
| 1354 | while (arena->rtt[i] == (RTT_VALID | new_postmap)) |
| 1355 | cpu_relax(); |
| 1356 | |
| 1357 | |
| 1358 | if (new_postmap >= arena->internal_nlba) { |
| 1359 | ret = -EIO; |
| 1360 | goto out_lane; |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1361 | } |
| 1362 | |
| 1363 | ret = btt_data_write(arena, new_postmap, page, off, cur_len); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1364 | if (ret) |
| 1365 | goto out_lane; |
| 1366 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1367 | if (bip) { |
| 1368 | ret = btt_rw_integrity(btt, bip, arena, new_postmap, |
| 1369 | WRITE); |
| 1370 | if (ret) |
| 1371 | goto out_lane; |
| 1372 | } |
| 1373 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1374 | lock_map(arena, premap); |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1375 | ret = btt_map_read(arena, premap, &old_postmap, NULL, &e_flag, |
Vishal Verma | 3ae3d67 | 2017-05-10 15:01:30 -0600 | [diff] [blame] | 1376 | NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1377 | if (ret) |
| 1378 | goto out_map; |
| 1379 | if (old_postmap >= arena->internal_nlba) { |
| 1380 | ret = -EIO; |
| 1381 | goto out_map; |
| 1382 | } |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1383 | if (e_flag) |
| 1384 | set_e_flag(old_postmap); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1385 | |
| 1386 | log.lba = cpu_to_le32(premap); |
| 1387 | log.old_map = cpu_to_le32(old_postmap); |
| 1388 | log.new_map = cpu_to_le32(new_postmap); |
| 1389 | log.seq = cpu_to_le32(arena->freelist[lane].seq); |
| 1390 | sub = arena->freelist[lane].sub; |
| 1391 | ret = btt_flog_write(arena, lane, sub, &log); |
| 1392 | if (ret) |
| 1393 | goto out_map; |
| 1394 | |
Vishal Verma | 1db1f3c | 2017-08-30 19:35:58 -0600 | [diff] [blame] | 1395 | ret = btt_map_write(arena, premap, new_postmap, 0, 0, |
| 1396 | NVDIMM_IO_ATOMIC); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1397 | if (ret) |
| 1398 | goto out_map; |
| 1399 | |
| 1400 | unlock_map(arena, premap); |
| 1401 | nd_region_release_lane(btt->nd_region, lane); |
| 1402 | |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1403 | if (e_flag) { |
| 1404 | ret = arena_clear_freelist_error(arena, lane); |
| 1405 | if (ret) |
| 1406 | return ret; |
| 1407 | } |
| 1408 | |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1409 | len -= cur_len; |
| 1410 | off += cur_len; |
| 1411 | sector += btt->sector_size >> SECTOR_SHIFT; |
| 1412 | } |
| 1413 | |
| 1414 | return 0; |
| 1415 | |
| 1416 | out_map: |
| 1417 | unlock_map(arena, premap); |
| 1418 | out_lane: |
| 1419 | nd_region_release_lane(btt->nd_region, lane); |
| 1420 | return ret; |
| 1421 | } |
| 1422 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1423 | static int btt_do_bvec(struct btt *btt, struct bio_integrity_payload *bip, |
| 1424 | struct page *page, unsigned int len, unsigned int off, |
Jens Axboe | c11f0c0 | 2016-08-05 08:11:04 -0600 | [diff] [blame] | 1425 | bool is_write, sector_t sector) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1426 | { |
| 1427 | int ret; |
| 1428 | |
Jens Axboe | c11f0c0 | 2016-08-05 08:11:04 -0600 | [diff] [blame] | 1429 | if (!is_write) { |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1430 | ret = btt_read_pg(btt, bip, page, off, sector, len); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1431 | flush_dcache_page(page); |
| 1432 | } else { |
| 1433 | flush_dcache_page(page); |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1434 | ret = btt_write_pg(btt, bip, sector, page, off, len); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1435 | } |
| 1436 | |
| 1437 | return ret; |
| 1438 | } |
| 1439 | |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1440 | static blk_qc_t btt_make_request(struct request_queue *q, struct bio *bio) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1441 | { |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1442 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1443 | struct btt *btt = q->queuedata; |
| 1444 | struct bvec_iter iter; |
Dan Williams | f0dc089 | 2015-05-16 12:28:53 -0400 | [diff] [blame] | 1445 | unsigned long start; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1446 | struct bio_vec bvec; |
Mike Christie | abf5454 | 2016-08-04 14:23:34 -0600 | [diff] [blame] | 1447 | int err = 0; |
Dan Williams | f0dc089 | 2015-05-16 12:28:53 -0400 | [diff] [blame] | 1448 | bool do_acct; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1449 | |
Dmitry Monakhov | e23947b | 2017-06-29 11:31:11 -0700 | [diff] [blame] | 1450 | if (!bio_integrity_prep(bio)) |
| 1451 | return BLK_QC_T_NONE; |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1452 | |
Dan Williams | f0dc089 | 2015-05-16 12:28:53 -0400 | [diff] [blame] | 1453 | do_acct = nd_iostat_start(bio, &start); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1454 | bio_for_each_segment(bvec, bio, iter) { |
| 1455 | unsigned int len = bvec.bv_len; |
| 1456 | |
Vishal Verma | 86652d2 | 2017-09-05 14:35:39 -0600 | [diff] [blame] | 1457 | if (len > PAGE_SIZE || len < btt->sector_size || |
| 1458 | len % btt->sector_size) { |
| 1459 | dev_err_ratelimited(&btt->nd_btt->dev, |
| 1460 | "unaligned bio segment (len: %d)\n", len); |
| 1461 | bio->bi_status = BLK_STS_IOERR; |
| 1462 | break; |
| 1463 | } |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1464 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1465 | err = btt_do_bvec(btt, bip, bvec.bv_page, len, bvec.bv_offset, |
Jens Axboe | c11f0c0 | 2016-08-05 08:11:04 -0600 | [diff] [blame] | 1466 | op_is_write(bio_op(bio)), iter.bi_sector); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1467 | if (err) { |
Vishal Verma | e6be2dc | 2017-06-30 18:32:51 -0600 | [diff] [blame] | 1468 | dev_err(&btt->nd_btt->dev, |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1469 | "io error in %s sector %lld, len %d,\n", |
Mike Christie | abf5454 | 2016-08-04 14:23:34 -0600 | [diff] [blame] | 1470 | (op_is_write(bio_op(bio))) ? "WRITE" : |
| 1471 | "READ", |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1472 | (unsigned long long) iter.bi_sector, len); |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 1473 | bio->bi_status = errno_to_blk_status(err); |
Dan Williams | f0dc089 | 2015-05-16 12:28:53 -0400 | [diff] [blame] | 1474 | break; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1475 | } |
| 1476 | } |
Dan Williams | f0dc089 | 2015-05-16 12:28:53 -0400 | [diff] [blame] | 1477 | if (do_acct) |
| 1478 | nd_iostat_end(bio, start); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1479 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1480 | bio_endio(bio); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1481 | return BLK_QC_T_NONE; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1482 | } |
| 1483 | |
| 1484 | static int btt_rw_page(struct block_device *bdev, sector_t sector, |
Jens Axboe | c11f0c0 | 2016-08-05 08:11:04 -0600 | [diff] [blame] | 1485 | struct page *page, bool is_write) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1486 | { |
| 1487 | struct btt *btt = bdev->bd_disk->private_data; |
Vishal Verma | c13c43d | 2017-06-29 16:59:11 -0600 | [diff] [blame] | 1488 | int rc; |
Huang Ying | 98cc093 | 2017-09-06 16:22:27 -0700 | [diff] [blame] | 1489 | unsigned int len; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1490 | |
Huang Ying | 98cc093 | 2017-09-06 16:22:27 -0700 | [diff] [blame] | 1491 | len = hpage_nr_pages(page) * PAGE_SIZE; |
| 1492 | rc = btt_do_bvec(btt, NULL, page, len, 0, is_write, sector); |
Vishal Verma | c13c43d | 2017-06-29 16:59:11 -0600 | [diff] [blame] | 1493 | if (rc == 0) |
| 1494 | page_endio(page, is_write, 0); |
| 1495 | |
| 1496 | return rc; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1497 | } |
| 1498 | |
| 1499 | |
| 1500 | static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo) |
| 1501 | { |
| 1502 | /* some standard values */ |
| 1503 | geo->heads = 1 << 6; |
| 1504 | geo->sectors = 1 << 5; |
| 1505 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; |
| 1506 | return 0; |
| 1507 | } |
| 1508 | |
| 1509 | static const struct block_device_operations btt_fops = { |
| 1510 | .owner = THIS_MODULE, |
| 1511 | .rw_page = btt_rw_page, |
| 1512 | .getgeo = btt_getgeo, |
Dan Williams | 5813882 | 2015-06-23 20:08:34 -0400 | [diff] [blame] | 1513 | .revalidate_disk = nvdimm_revalidate_disk, |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1514 | }; |
| 1515 | |
| 1516 | static int btt_blk_init(struct btt *btt) |
| 1517 | { |
| 1518 | struct nd_btt *nd_btt = btt->nd_btt; |
| 1519 | struct nd_namespace_common *ndns = nd_btt->ndns; |
| 1520 | |
| 1521 | /* create a new disk and request queue for btt */ |
| 1522 | btt->btt_queue = blk_alloc_queue(GFP_KERNEL); |
| 1523 | if (!btt->btt_queue) |
| 1524 | return -ENOMEM; |
| 1525 | |
| 1526 | btt->btt_disk = alloc_disk(0); |
| 1527 | if (!btt->btt_disk) { |
| 1528 | blk_cleanup_queue(btt->btt_queue); |
| 1529 | return -ENOMEM; |
| 1530 | } |
| 1531 | |
| 1532 | nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1533 | btt->btt_disk->first_minor = 0; |
| 1534 | btt->btt_disk->fops = &btt_fops; |
| 1535 | btt->btt_disk->private_data = btt; |
| 1536 | btt->btt_disk->queue = btt->btt_queue; |
| 1537 | btt->btt_disk->flags = GENHD_FL_EXT_DEVT; |
| 1538 | |
| 1539 | blk_queue_make_request(btt->btt_queue, btt_make_request); |
| 1540 | blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); |
| 1541 | blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1542 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, btt->btt_queue); |
| 1543 | btt->btt_queue->queuedata = btt; |
| 1544 | |
Vishal Verma | 41cd8b7 | 2015-06-25 04:21:52 -0400 | [diff] [blame] | 1545 | if (btt_meta_size(btt)) { |
| 1546 | int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt)); |
| 1547 | |
| 1548 | if (rc) { |
| 1549 | del_gendisk(btt->btt_disk); |
| 1550 | put_disk(btt->btt_disk); |
| 1551 | blk_cleanup_queue(btt->btt_queue); |
| 1552 | return rc; |
| 1553 | } |
| 1554 | } |
| 1555 | set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9); |
Vishal Verma | 865a022 | 2018-03-05 16:56:13 -0700 | [diff] [blame] | 1556 | device_add_disk(&btt->nd_btt->dev, btt->btt_disk); |
Vishal Verma | abe8b4e | 2016-07-27 16:38:59 -0600 | [diff] [blame] | 1557 | btt->nd_btt->size = btt->nlba * (u64)btt->sector_size; |
Dan Williams | 5813882 | 2015-06-23 20:08:34 -0400 | [diff] [blame] | 1558 | revalidate_disk(btt->btt_disk); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1559 | |
| 1560 | return 0; |
| 1561 | } |
| 1562 | |
| 1563 | static void btt_blk_cleanup(struct btt *btt) |
| 1564 | { |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1565 | del_gendisk(btt->btt_disk); |
| 1566 | put_disk(btt->btt_disk); |
| 1567 | blk_cleanup_queue(btt->btt_queue); |
| 1568 | } |
| 1569 | |
| 1570 | /** |
| 1571 | * btt_init - initialize a block translation table for the given device |
| 1572 | * @nd_btt: device with BTT geometry and backing device info |
| 1573 | * @rawsize: raw size in bytes of the backing device |
| 1574 | * @lbasize: lba size of the backing device |
| 1575 | * @uuid: A uuid for the backing device - this is stored on media |
| 1576 | * @maxlane: maximum number of parallel requests the device can handle |
| 1577 | * |
| 1578 | * Initialize a Block Translation Table on a backing device to provide |
| 1579 | * single sector power fail atomicity. |
| 1580 | * |
| 1581 | * Context: |
| 1582 | * Might sleep. |
| 1583 | * |
| 1584 | * Returns: |
| 1585 | * Pointer to a new struct btt on success, NULL on failure. |
| 1586 | */ |
| 1587 | static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize, |
| 1588 | u32 lbasize, u8 *uuid, struct nd_region *nd_region) |
| 1589 | { |
| 1590 | int ret; |
| 1591 | struct btt *btt; |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1592 | struct nd_namespace_io *nsio; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1593 | struct device *dev = &nd_btt->dev; |
| 1594 | |
Dan Williams | e32bc72 | 2016-03-17 18:23:09 -0700 | [diff] [blame] | 1595 | btt = devm_kzalloc(dev, sizeof(struct btt), GFP_KERNEL); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1596 | if (!btt) |
| 1597 | return NULL; |
| 1598 | |
| 1599 | btt->nd_btt = nd_btt; |
| 1600 | btt->rawsize = rawsize; |
| 1601 | btt->lbasize = lbasize; |
| 1602 | btt->sector_size = ((lbasize >= 4096) ? 4096 : 512); |
| 1603 | INIT_LIST_HEAD(&btt->arena_list); |
| 1604 | mutex_init(&btt->init_lock); |
| 1605 | btt->nd_region = nd_region; |
Vishal Verma | d9b83c7 | 2017-08-30 19:36:03 -0600 | [diff] [blame] | 1606 | nsio = to_nd_namespace_io(&nd_btt->ndns->dev); |
| 1607 | btt->phys_bb = &nsio->bb; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1608 | |
| 1609 | ret = discover_arenas(btt); |
| 1610 | if (ret) { |
| 1611 | dev_err(dev, "init: error in arena_discover: %d\n", ret); |
Dan Williams | e32bc72 | 2016-03-17 18:23:09 -0700 | [diff] [blame] | 1612 | return NULL; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1613 | } |
| 1614 | |
Dan Williams | 5813882 | 2015-06-23 20:08:34 -0400 | [diff] [blame] | 1615 | if (btt->init_state != INIT_READY && nd_region->ro) { |
Vishal Verma | e6be2dc | 2017-06-30 18:32:51 -0600 | [diff] [blame] | 1616 | dev_warn(dev, "%s is read-only, unable to init btt metadata\n", |
Dan Williams | 5813882 | 2015-06-23 20:08:34 -0400 | [diff] [blame] | 1617 | dev_name(&nd_region->dev)); |
Dan Williams | e32bc72 | 2016-03-17 18:23:09 -0700 | [diff] [blame] | 1618 | return NULL; |
Dan Williams | 5813882 | 2015-06-23 20:08:34 -0400 | [diff] [blame] | 1619 | } else if (btt->init_state != INIT_READY) { |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1620 | btt->num_arenas = (rawsize / ARENA_MAX_SIZE) + |
| 1621 | ((rawsize % ARENA_MAX_SIZE) ? 1 : 0); |
| 1622 | dev_dbg(dev, "init: %d arenas for %llu rawsize\n", |
| 1623 | btt->num_arenas, rawsize); |
| 1624 | |
| 1625 | ret = create_arenas(btt); |
| 1626 | if (ret) { |
| 1627 | dev_info(dev, "init: create_arenas: %d\n", ret); |
Dan Williams | e32bc72 | 2016-03-17 18:23:09 -0700 | [diff] [blame] | 1628 | return NULL; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1629 | } |
| 1630 | |
| 1631 | ret = btt_meta_init(btt); |
| 1632 | if (ret) { |
| 1633 | dev_err(dev, "init: error in meta_init: %d\n", ret); |
Dan Williams | e32bc72 | 2016-03-17 18:23:09 -0700 | [diff] [blame] | 1634 | return NULL; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1635 | } |
| 1636 | } |
| 1637 | |
| 1638 | ret = btt_blk_init(btt); |
| 1639 | if (ret) { |
| 1640 | dev_err(dev, "init: error in blk_init: %d\n", ret); |
Dan Williams | e32bc72 | 2016-03-17 18:23:09 -0700 | [diff] [blame] | 1641 | return NULL; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1642 | } |
| 1643 | |
| 1644 | btt_debugfs_init(btt); |
| 1645 | |
| 1646 | return btt; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1647 | } |
| 1648 | |
| 1649 | /** |
| 1650 | * btt_fini - de-initialize a BTT |
| 1651 | * @btt: the BTT handle that was generated by btt_init |
| 1652 | * |
| 1653 | * De-initialize a Block Translation Table on device removal |
| 1654 | * |
| 1655 | * Context: |
| 1656 | * Might sleep. |
| 1657 | */ |
| 1658 | static void btt_fini(struct btt *btt) |
| 1659 | { |
| 1660 | if (btt) { |
| 1661 | btt_blk_cleanup(btt); |
| 1662 | free_arenas(btt); |
| 1663 | debugfs_remove_recursive(btt->debugfs_dir); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns) |
| 1668 | { |
| 1669 | struct nd_btt *nd_btt = to_nd_btt(ndns->claim); |
| 1670 | struct nd_region *nd_region; |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 1671 | struct btt_sb *btt_sb; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1672 | struct btt *btt; |
| 1673 | size_t rawsize; |
| 1674 | |
Dan Williams | 9dec489 | 2016-04-22 12:26:05 -0700 | [diff] [blame] | 1675 | if (!nd_btt->uuid || !nd_btt->ndns || !nd_btt->lbasize) { |
| 1676 | dev_dbg(&nd_btt->dev, "incomplete btt configuration\n"); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1677 | return -ENODEV; |
Dan Williams | 9dec489 | 2016-04-22 12:26:05 -0700 | [diff] [blame] | 1678 | } |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1679 | |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 1680 | btt_sb = devm_kzalloc(&nd_btt->dev, sizeof(*btt_sb), GFP_KERNEL); |
Christophe Jaillet | ed36b4d | 2017-08-27 08:30:34 +0200 | [diff] [blame] | 1681 | if (!btt_sb) |
| 1682 | return -ENOMEM; |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 1683 | |
| 1684 | /* |
| 1685 | * If this returns < 0, that is ok as it just means there wasn't |
| 1686 | * an existing BTT, and we're creating a new one. We still need to |
| 1687 | * call this as we need the version dependent fields in nd_btt to be |
| 1688 | * set correctly based on the holder class |
| 1689 | */ |
| 1690 | nd_btt_version(nd_btt, ndns, btt_sb); |
| 1691 | |
| 1692 | rawsize = nvdimm_namespace_capacity(ndns) - nd_btt->initial_offset; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1693 | if (rawsize < ARENA_MIN_SIZE) { |
Dan Williams | 9dec489 | 2016-04-22 12:26:05 -0700 | [diff] [blame] | 1694 | dev_dbg(&nd_btt->dev, "%s must be at least %ld bytes\n", |
Vishal Verma | 14e4945 | 2017-06-28 14:25:00 -0600 | [diff] [blame] | 1695 | dev_name(&ndns->dev), |
| 1696 | ARENA_MIN_SIZE + nd_btt->initial_offset); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1697 | return -ENXIO; |
| 1698 | } |
| 1699 | nd_region = to_nd_region(nd_btt->dev.parent); |
| 1700 | btt = btt_init(nd_btt, rawsize, nd_btt->lbasize, nd_btt->uuid, |
| 1701 | nd_region); |
| 1702 | if (!btt) |
| 1703 | return -ENOMEM; |
| 1704 | nd_btt->btt = btt; |
| 1705 | |
| 1706 | return 0; |
| 1707 | } |
| 1708 | EXPORT_SYMBOL(nvdimm_namespace_attach_btt); |
| 1709 | |
Dan Williams | 298f2bc | 2016-03-15 16:41:04 -0700 | [diff] [blame] | 1710 | int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1711 | { |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1712 | struct btt *btt = nd_btt->btt; |
| 1713 | |
| 1714 | btt_fini(btt); |
| 1715 | nd_btt->btt = NULL; |
| 1716 | |
| 1717 | return 0; |
| 1718 | } |
| 1719 | EXPORT_SYMBOL(nvdimm_namespace_detach_btt); |
| 1720 | |
| 1721 | static int __init nd_btt_init(void) |
| 1722 | { |
NeilBrown | ff8e92d | 2016-03-10 08:59:28 +1100 | [diff] [blame] | 1723 | int rc = 0; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1724 | |
| 1725 | debugfs_root = debugfs_create_dir("btt", NULL); |
NeilBrown | ff8e92d | 2016-03-10 08:59:28 +1100 | [diff] [blame] | 1726 | if (IS_ERR_OR_NULL(debugfs_root)) |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1727 | rc = -ENXIO; |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1728 | |
| 1729 | return rc; |
| 1730 | } |
| 1731 | |
| 1732 | static void __exit nd_btt_exit(void) |
| 1733 | { |
| 1734 | debugfs_remove_recursive(debugfs_root); |
Vishal Verma | 5212e11 | 2015-06-25 04:20:32 -0400 | [diff] [blame] | 1735 | } |
| 1736 | |
| 1737 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT); |
| 1738 | MODULE_AUTHOR("Vishal Verma <vishal.l.verma@linux.intel.com>"); |
| 1739 | MODULE_LICENSE("GPL v2"); |
| 1740 | module_init(nd_btt_init); |
| 1741 | module_exit(nd_btt_exit); |