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a4bd217b JG |
1 | /* |
2 | * Copyright (C) 2015 IT University of Copenhagen (rrpc.c) | |
3 | * Copyright (C) 2016 CNEX Labs | |
4 | * Initial release: Javier Gonzalez <javier@cnexlabs.com> | |
5 | * Matias Bjorling <matias@cnexlabs.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version | |
9 | * 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * Implementation of a physical block-device target for Open-channel SSDs. | |
17 | * | |
18 | * pblk-init.c - pblk's initialization. | |
19 | */ | |
20 | ||
21 | #include "pblk.h" | |
22 | ||
084ec9ba JG |
23 | static struct kmem_cache *pblk_blk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache, |
24 | *pblk_w_rq_cache, *pblk_line_meta_cache; | |
a4bd217b | 25 | static DECLARE_RWSEM(pblk_lock); |
b25d5237 | 26 | struct bio_set *pblk_bio_set; |
a4bd217b JG |
27 | |
28 | static int pblk_rw_io(struct request_queue *q, struct pblk *pblk, | |
29 | struct bio *bio) | |
30 | { | |
31 | int ret; | |
32 | ||
33 | /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap | |
34 | * constraint. Writes can be of arbitrary size. | |
35 | */ | |
36 | if (bio_data_dir(bio) == READ) { | |
af67c31f | 37 | blk_queue_split(q, &bio); |
a4bd217b JG |
38 | ret = pblk_submit_read(pblk, bio); |
39 | if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED)) | |
40 | bio_put(bio); | |
41 | ||
42 | return ret; | |
43 | } | |
44 | ||
45 | /* Prevent deadlock in the case of a modest LUN configuration and large | |
46 | * user I/Os. Unless stalled, the rate limiter leaves at least 256KB | |
47 | * available for user I/O. | |
48 | */ | |
49 | if (unlikely(pblk_get_secs(bio) >= pblk_rl_sysfs_rate_show(&pblk->rl))) | |
af67c31f | 50 | blk_queue_split(q, &bio); |
a4bd217b JG |
51 | |
52 | return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER); | |
53 | } | |
54 | ||
55 | static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio) | |
56 | { | |
57 | struct pblk *pblk = q->queuedata; | |
58 | ||
59 | if (bio_op(bio) == REQ_OP_DISCARD) { | |
60 | pblk_discard(pblk, bio); | |
61 | if (!(bio->bi_opf & REQ_PREFLUSH)) { | |
62 | bio_endio(bio); | |
63 | return BLK_QC_T_NONE; | |
64 | } | |
65 | } | |
66 | ||
67 | switch (pblk_rw_io(q, pblk, bio)) { | |
68 | case NVM_IO_ERR: | |
69 | bio_io_error(bio); | |
70 | break; | |
71 | case NVM_IO_DONE: | |
72 | bio_endio(bio); | |
73 | break; | |
74 | } | |
75 | ||
76 | return BLK_QC_T_NONE; | |
77 | } | |
78 | ||
79 | static void pblk_l2p_free(struct pblk *pblk) | |
80 | { | |
81 | vfree(pblk->trans_map); | |
82 | } | |
83 | ||
84 | static int pblk_l2p_init(struct pblk *pblk) | |
85 | { | |
86 | sector_t i; | |
87 | struct ppa_addr ppa; | |
88 | int entry_size = 8; | |
89 | ||
90 | if (pblk->ppaf_bitsize < 32) | |
91 | entry_size = 4; | |
92 | ||
93 | pblk->trans_map = vmalloc(entry_size * pblk->rl.nr_secs); | |
94 | if (!pblk->trans_map) | |
95 | return -ENOMEM; | |
96 | ||
97 | pblk_ppa_set_empty(&ppa); | |
98 | ||
99 | for (i = 0; i < pblk->rl.nr_secs; i++) | |
100 | pblk_trans_map_set(pblk, i, ppa); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static void pblk_rwb_free(struct pblk *pblk) | |
106 | { | |
107 | if (pblk_rb_tear_down_check(&pblk->rwb)) | |
108 | pr_err("pblk: write buffer error on tear down\n"); | |
109 | ||
110 | pblk_rb_data_free(&pblk->rwb); | |
111 | vfree(pblk_rb_entries_ref(&pblk->rwb)); | |
112 | } | |
113 | ||
114 | static int pblk_rwb_init(struct pblk *pblk) | |
115 | { | |
116 | struct nvm_tgt_dev *dev = pblk->dev; | |
117 | struct nvm_geo *geo = &dev->geo; | |
118 | struct pblk_rb_entry *entries; | |
119 | unsigned long nr_entries; | |
120 | unsigned int power_size, power_seg_sz; | |
121 | ||
122 | nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer); | |
123 | ||
124 | entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry)); | |
125 | if (!entries) | |
126 | return -ENOMEM; | |
127 | ||
128 | power_size = get_count_order(nr_entries); | |
129 | power_seg_sz = get_count_order(geo->sec_size); | |
130 | ||
131 | return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz); | |
132 | } | |
133 | ||
134 | /* Minimum pages needed within a lun */ | |
135 | #define PAGE_POOL_SIZE 16 | |
136 | #define ADDR_POOL_SIZE 64 | |
137 | ||
138 | static int pblk_set_ppaf(struct pblk *pblk) | |
139 | { | |
140 | struct nvm_tgt_dev *dev = pblk->dev; | |
141 | struct nvm_geo *geo = &dev->geo; | |
142 | struct nvm_addr_format ppaf = geo->ppaf; | |
143 | int power_len; | |
144 | ||
145 | /* Re-calculate channel and lun format to adapt to configuration */ | |
146 | power_len = get_count_order(geo->nr_chnls); | |
147 | if (1 << power_len != geo->nr_chnls) { | |
148 | pr_err("pblk: supports only power-of-two channel config.\n"); | |
149 | return -EINVAL; | |
150 | } | |
151 | ppaf.ch_len = power_len; | |
152 | ||
153 | power_len = get_count_order(geo->luns_per_chnl); | |
154 | if (1 << power_len != geo->luns_per_chnl) { | |
155 | pr_err("pblk: supports only power-of-two LUN config.\n"); | |
156 | return -EINVAL; | |
157 | } | |
158 | ppaf.lun_len = power_len; | |
159 | ||
160 | pblk->ppaf.sec_offset = 0; | |
161 | pblk->ppaf.pln_offset = ppaf.sect_len; | |
162 | pblk->ppaf.ch_offset = pblk->ppaf.pln_offset + ppaf.pln_len; | |
163 | pblk->ppaf.lun_offset = pblk->ppaf.ch_offset + ppaf.ch_len; | |
164 | pblk->ppaf.pg_offset = pblk->ppaf.lun_offset + ppaf.lun_len; | |
165 | pblk->ppaf.blk_offset = pblk->ppaf.pg_offset + ppaf.pg_len; | |
166 | pblk->ppaf.sec_mask = (1ULL << ppaf.sect_len) - 1; | |
167 | pblk->ppaf.pln_mask = ((1ULL << ppaf.pln_len) - 1) << | |
168 | pblk->ppaf.pln_offset; | |
169 | pblk->ppaf.ch_mask = ((1ULL << ppaf.ch_len) - 1) << | |
170 | pblk->ppaf.ch_offset; | |
171 | pblk->ppaf.lun_mask = ((1ULL << ppaf.lun_len) - 1) << | |
172 | pblk->ppaf.lun_offset; | |
173 | pblk->ppaf.pg_mask = ((1ULL << ppaf.pg_len) - 1) << | |
174 | pblk->ppaf.pg_offset; | |
175 | pblk->ppaf.blk_mask = ((1ULL << ppaf.blk_len) - 1) << | |
176 | pblk->ppaf.blk_offset; | |
177 | ||
178 | pblk->ppaf_bitsize = pblk->ppaf.blk_offset + ppaf.blk_len; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int pblk_init_global_caches(struct pblk *pblk) | |
184 | { | |
185 | char cache_name[PBLK_CACHE_NAME_LEN]; | |
186 | ||
187 | down_write(&pblk_lock); | |
188 | pblk_blk_ws_cache = kmem_cache_create("pblk_blk_ws", | |
189 | sizeof(struct pblk_line_ws), 0, 0, NULL); | |
190 | if (!pblk_blk_ws_cache) { | |
191 | up_write(&pblk_lock); | |
192 | return -ENOMEM; | |
193 | } | |
194 | ||
195 | pblk_rec_cache = kmem_cache_create("pblk_rec", | |
196 | sizeof(struct pblk_rec_ctx), 0, 0, NULL); | |
197 | if (!pblk_rec_cache) { | |
198 | kmem_cache_destroy(pblk_blk_ws_cache); | |
199 | up_write(&pblk_lock); | |
200 | return -ENOMEM; | |
201 | } | |
202 | ||
084ec9ba | 203 | pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size, |
a4bd217b | 204 | 0, 0, NULL); |
084ec9ba | 205 | if (!pblk_g_rq_cache) { |
a4bd217b JG |
206 | kmem_cache_destroy(pblk_blk_ws_cache); |
207 | kmem_cache_destroy(pblk_rec_cache); | |
208 | up_write(&pblk_lock); | |
209 | return -ENOMEM; | |
210 | } | |
211 | ||
212 | pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size, | |
213 | 0, 0, NULL); | |
214 | if (!pblk_w_rq_cache) { | |
215 | kmem_cache_destroy(pblk_blk_ws_cache); | |
216 | kmem_cache_destroy(pblk_rec_cache); | |
084ec9ba | 217 | kmem_cache_destroy(pblk_g_rq_cache); |
a4bd217b JG |
218 | up_write(&pblk_lock); |
219 | return -ENOMEM; | |
220 | } | |
221 | ||
222 | snprintf(cache_name, sizeof(cache_name), "pblk_line_m_%s", | |
223 | pblk->disk->disk_name); | |
224 | pblk_line_meta_cache = kmem_cache_create(cache_name, | |
225 | pblk->lm.sec_bitmap_len, 0, 0, NULL); | |
226 | if (!pblk_line_meta_cache) { | |
227 | kmem_cache_destroy(pblk_blk_ws_cache); | |
228 | kmem_cache_destroy(pblk_rec_cache); | |
084ec9ba | 229 | kmem_cache_destroy(pblk_g_rq_cache); |
a4bd217b JG |
230 | kmem_cache_destroy(pblk_w_rq_cache); |
231 | up_write(&pblk_lock); | |
232 | return -ENOMEM; | |
233 | } | |
234 | up_write(&pblk_lock); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int pblk_core_init(struct pblk *pblk) | |
240 | { | |
241 | struct nvm_tgt_dev *dev = pblk->dev; | |
242 | struct nvm_geo *geo = &dev->geo; | |
a4bd217b | 243 | |
a4bd217b JG |
244 | pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg * |
245 | geo->nr_planes * geo->nr_luns; | |
246 | ||
a4bd217b JG |
247 | if (pblk_init_global_caches(pblk)) |
248 | return -ENOMEM; | |
249 | ||
250 | pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0); | |
251 | if (!pblk->page_pool) | |
252 | return -ENOMEM; | |
253 | ||
254 | pblk->line_ws_pool = mempool_create_slab_pool(geo->nr_luns, | |
255 | pblk_blk_ws_cache); | |
256 | if (!pblk->line_ws_pool) | |
257 | goto free_page_pool; | |
258 | ||
259 | pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache); | |
260 | if (!pblk->rec_pool) | |
261 | goto free_blk_ws_pool; | |
262 | ||
084ec9ba JG |
263 | pblk->g_rq_pool = mempool_create_slab_pool(64, pblk_g_rq_cache); |
264 | if (!pblk->g_rq_pool) | |
a4bd217b JG |
265 | goto free_rec_pool; |
266 | ||
267 | pblk->w_rq_pool = mempool_create_slab_pool(64, pblk_w_rq_cache); | |
268 | if (!pblk->w_rq_pool) | |
084ec9ba | 269 | goto free_g_rq_pool; |
a4bd217b JG |
270 | |
271 | pblk->line_meta_pool = | |
272 | mempool_create_slab_pool(16, pblk_line_meta_cache); | |
273 | if (!pblk->line_meta_pool) | |
274 | goto free_w_rq_pool; | |
275 | ||
276 | pblk->kw_wq = alloc_workqueue("pblk-aux-wq", | |
277 | WQ_MEM_RECLAIM | WQ_UNBOUND, 1); | |
278 | if (!pblk->kw_wq) | |
279 | goto free_line_meta_pool; | |
280 | ||
281 | if (pblk_set_ppaf(pblk)) | |
282 | goto free_kw_wq; | |
283 | ||
284 | if (pblk_rwb_init(pblk)) | |
285 | goto free_kw_wq; | |
286 | ||
287 | INIT_LIST_HEAD(&pblk->compl_list); | |
288 | return 0; | |
289 | ||
290 | free_kw_wq: | |
291 | destroy_workqueue(pblk->kw_wq); | |
292 | free_line_meta_pool: | |
293 | mempool_destroy(pblk->line_meta_pool); | |
294 | free_w_rq_pool: | |
295 | mempool_destroy(pblk->w_rq_pool); | |
084ec9ba JG |
296 | free_g_rq_pool: |
297 | mempool_destroy(pblk->g_rq_pool); | |
a4bd217b JG |
298 | free_rec_pool: |
299 | mempool_destroy(pblk->rec_pool); | |
300 | free_blk_ws_pool: | |
301 | mempool_destroy(pblk->line_ws_pool); | |
302 | free_page_pool: | |
303 | mempool_destroy(pblk->page_pool); | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | static void pblk_core_free(struct pblk *pblk) | |
308 | { | |
309 | if (pblk->kw_wq) | |
310 | destroy_workqueue(pblk->kw_wq); | |
311 | ||
312 | mempool_destroy(pblk->page_pool); | |
313 | mempool_destroy(pblk->line_ws_pool); | |
314 | mempool_destroy(pblk->rec_pool); | |
084ec9ba | 315 | mempool_destroy(pblk->g_rq_pool); |
a4bd217b JG |
316 | mempool_destroy(pblk->w_rq_pool); |
317 | mempool_destroy(pblk->line_meta_pool); | |
318 | ||
319 | kmem_cache_destroy(pblk_blk_ws_cache); | |
320 | kmem_cache_destroy(pblk_rec_cache); | |
084ec9ba | 321 | kmem_cache_destroy(pblk_g_rq_cache); |
a4bd217b JG |
322 | kmem_cache_destroy(pblk_w_rq_cache); |
323 | kmem_cache_destroy(pblk_line_meta_cache); | |
324 | } | |
325 | ||
326 | static void pblk_luns_free(struct pblk *pblk) | |
327 | { | |
328 | kfree(pblk->luns); | |
329 | } | |
330 | ||
dffdd960 JG |
331 | static void pblk_free_line_bitmaps(struct pblk_line *line) |
332 | { | |
333 | kfree(line->blk_bitmap); | |
334 | kfree(line->erase_bitmap); | |
335 | } | |
336 | ||
a4bd217b JG |
337 | static void pblk_lines_free(struct pblk *pblk) |
338 | { | |
339 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
340 | struct pblk_line *line; | |
341 | int i; | |
342 | ||
343 | spin_lock(&l_mg->free_lock); | |
344 | for (i = 0; i < l_mg->nr_lines; i++) { | |
345 | line = &pblk->lines[i]; | |
346 | ||
347 | pblk_line_free(pblk, line); | |
dffdd960 | 348 | pblk_free_line_bitmaps(line); |
a4bd217b JG |
349 | } |
350 | spin_unlock(&l_mg->free_lock); | |
351 | } | |
352 | ||
353 | static void pblk_line_meta_free(struct pblk *pblk) | |
354 | { | |
355 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
356 | int i; | |
357 | ||
358 | kfree(l_mg->bb_template); | |
359 | kfree(l_mg->bb_aux); | |
dd2a4343 | 360 | kfree(l_mg->vsc_list); |
a4bd217b JG |
361 | |
362 | for (i = 0; i < PBLK_DATA_LINES; i++) { | |
f680f19a | 363 | kfree(l_mg->sline_meta[i]); |
dd2a4343 | 364 | pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type); |
f680f19a | 365 | kfree(l_mg->eline_meta[i]); |
a4bd217b JG |
366 | } |
367 | ||
368 | kfree(pblk->lines); | |
369 | } | |
370 | ||
371 | static int pblk_bb_discovery(struct nvm_tgt_dev *dev, struct pblk_lun *rlun) | |
372 | { | |
373 | struct nvm_geo *geo = &dev->geo; | |
374 | struct ppa_addr ppa; | |
375 | u8 *blks; | |
376 | int nr_blks, ret; | |
377 | ||
378 | nr_blks = geo->blks_per_lun * geo->plane_mode; | |
379 | blks = kmalloc(nr_blks, GFP_KERNEL); | |
380 | if (!blks) | |
381 | return -ENOMEM; | |
382 | ||
383 | ppa.ppa = 0; | |
384 | ppa.g.ch = rlun->bppa.g.ch; | |
385 | ppa.g.lun = rlun->bppa.g.lun; | |
386 | ||
387 | ret = nvm_get_tgt_bb_tbl(dev, ppa, blks); | |
388 | if (ret) | |
389 | goto out; | |
390 | ||
391 | nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks); | |
392 | if (nr_blks < 0) { | |
a4bd217b | 393 | ret = nr_blks; |
5136a4fd | 394 | goto out; |
a4bd217b JG |
395 | } |
396 | ||
397 | rlun->bb_list = blks; | |
398 | ||
5136a4fd | 399 | return 0; |
a4bd217b | 400 | out: |
5136a4fd | 401 | kfree(blks); |
a4bd217b JG |
402 | return ret; |
403 | } | |
404 | ||
dffdd960 JG |
405 | static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line, |
406 | int blk_per_line) | |
a4bd217b | 407 | { |
dffdd960 JG |
408 | struct nvm_tgt_dev *dev = pblk->dev; |
409 | struct nvm_geo *geo = &dev->geo; | |
a4bd217b JG |
410 | struct pblk_lun *rlun; |
411 | int bb_cnt = 0; | |
412 | int i; | |
413 | ||
dffdd960 JG |
414 | for (i = 0; i < blk_per_line; i++) { |
415 | rlun = &pblk->luns[i]; | |
416 | if (rlun->bb_list[line->id] == NVM_BLK_T_FREE) | |
417 | continue; | |
418 | ||
419 | set_bit(pblk_ppa_to_pos(geo, rlun->bppa), line->blk_bitmap); | |
420 | bb_cnt++; | |
421 | } | |
422 | ||
423 | return bb_cnt; | |
424 | } | |
425 | ||
426 | static int pblk_alloc_line_bitmaps(struct pblk *pblk, struct pblk_line *line) | |
427 | { | |
428 | struct pblk_line_meta *lm = &pblk->lm; | |
429 | ||
a4bd217b JG |
430 | line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL); |
431 | if (!line->blk_bitmap) | |
432 | return -ENOMEM; | |
433 | ||
434 | line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL); | |
435 | if (!line->erase_bitmap) { | |
436 | kfree(line->blk_bitmap); | |
437 | return -ENOMEM; | |
438 | } | |
439 | ||
dffdd960 | 440 | return 0; |
a4bd217b JG |
441 | } |
442 | ||
443 | static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns) | |
444 | { | |
445 | struct nvm_tgt_dev *dev = pblk->dev; | |
446 | struct nvm_geo *geo = &dev->geo; | |
447 | struct pblk_lun *rlun; | |
448 | int i, ret; | |
449 | ||
450 | /* TODO: Implement unbalanced LUN support */ | |
451 | if (geo->luns_per_chnl < 0) { | |
452 | pr_err("pblk: unbalanced LUN config.\n"); | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
456 | pblk->luns = kcalloc(geo->nr_luns, sizeof(struct pblk_lun), GFP_KERNEL); | |
457 | if (!pblk->luns) | |
458 | return -ENOMEM; | |
459 | ||
460 | for (i = 0; i < geo->nr_luns; i++) { | |
461 | /* Stripe across channels */ | |
462 | int ch = i % geo->nr_chnls; | |
463 | int lun_raw = i / geo->nr_chnls; | |
464 | int lunid = lun_raw + ch * geo->luns_per_chnl; | |
465 | ||
466 | rlun = &pblk->luns[i]; | |
467 | rlun->bppa = luns[lunid]; | |
468 | ||
469 | sema_init(&rlun->wr_sem, 1); | |
470 | ||
471 | ret = pblk_bb_discovery(dev, rlun); | |
472 | if (ret) { | |
473 | while (--i >= 0) | |
474 | kfree(pblk->luns[i].bb_list); | |
475 | return ret; | |
476 | } | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | static int pblk_lines_configure(struct pblk *pblk, int flags) | |
483 | { | |
484 | struct pblk_line *line = NULL; | |
485 | int ret = 0; | |
486 | ||
487 | if (!(flags & NVM_TARGET_FACTORY)) { | |
488 | line = pblk_recov_l2p(pblk); | |
489 | if (IS_ERR(line)) { | |
490 | pr_err("pblk: could not recover l2p table\n"); | |
491 | ret = -EFAULT; | |
492 | } | |
493 | } | |
494 | ||
495 | if (!line) { | |
496 | /* Configure next line for user data */ | |
497 | line = pblk_line_get_first_data(pblk); | |
498 | if (!line) { | |
499 | pr_err("pblk: line list corrupted\n"); | |
500 | ret = -EFAULT; | |
501 | } | |
502 | } | |
503 | ||
504 | return ret; | |
505 | } | |
506 | ||
507 | /* See comment over struct line_emeta definition */ | |
dd2a4343 | 508 | static unsigned int calc_emeta_len(struct pblk *pblk) |
a4bd217b | 509 | { |
dd2a4343 JG |
510 | struct pblk_line_meta *lm = &pblk->lm; |
511 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
512 | struct nvm_tgt_dev *dev = pblk->dev; | |
513 | struct nvm_geo *geo = &dev->geo; | |
514 | ||
515 | /* Round to sector size so that lba_list starts on its own sector */ | |
516 | lm->emeta_sec[1] = DIV_ROUND_UP( | |
517 | sizeof(struct line_emeta) + lm->blk_bitmap_len, | |
518 | geo->sec_size); | |
519 | lm->emeta_len[1] = lm->emeta_sec[1] * geo->sec_size; | |
520 | ||
521 | /* Round to sector size so that vsc_list starts on its own sector */ | |
522 | lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0]; | |
523 | lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64), | |
524 | geo->sec_size); | |
525 | lm->emeta_len[2] = lm->emeta_sec[2] * geo->sec_size; | |
526 | ||
527 | lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32), | |
528 | geo->sec_size); | |
529 | lm->emeta_len[3] = lm->emeta_sec[3] * geo->sec_size; | |
530 | ||
531 | lm->vsc_list_len = l_mg->nr_lines * sizeof(u32); | |
532 | ||
533 | return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]); | |
a4bd217b JG |
534 | } |
535 | ||
536 | static void pblk_set_provision(struct pblk *pblk, long nr_free_blks) | |
537 | { | |
538 | struct nvm_tgt_dev *dev = pblk->dev; | |
539 | struct nvm_geo *geo = &dev->geo; | |
540 | sector_t provisioned; | |
541 | ||
542 | pblk->over_pct = 20; | |
543 | ||
544 | provisioned = nr_free_blks; | |
545 | provisioned *= (100 - pblk->over_pct); | |
546 | sector_div(provisioned, 100); | |
547 | ||
548 | /* Internally pblk manages all free blocks, but all calculations based | |
549 | * on user capacity consider only provisioned blocks | |
550 | */ | |
551 | pblk->rl.total_blocks = nr_free_blks; | |
552 | pblk->rl.nr_secs = nr_free_blks * geo->sec_per_blk; | |
553 | pblk->capacity = provisioned * geo->sec_per_blk; | |
554 | atomic_set(&pblk->rl.free_blocks, nr_free_blks); | |
555 | } | |
556 | ||
dd2a4343 JG |
557 | static int pblk_lines_alloc_metadata(struct pblk *pblk) |
558 | { | |
559 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
560 | struct pblk_line_meta *lm = &pblk->lm; | |
561 | int i; | |
562 | ||
563 | /* smeta is always small enough to fit on a kmalloc memory allocation, | |
564 | * emeta depends on the number of LUNs allocated to the pblk instance | |
565 | */ | |
dd2a4343 JG |
566 | for (i = 0; i < PBLK_DATA_LINES; i++) { |
567 | l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL); | |
568 | if (!l_mg->sline_meta[i]) | |
569 | goto fail_free_smeta; | |
570 | } | |
571 | ||
572 | /* emeta allocates three different buffers for managing metadata with | |
573 | * in-memory and in-media layouts | |
574 | */ | |
575 | for (i = 0; i < PBLK_DATA_LINES; i++) { | |
576 | struct pblk_emeta *emeta; | |
577 | ||
578 | emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL); | |
579 | if (!emeta) | |
580 | goto fail_free_emeta; | |
581 | ||
582 | if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) { | |
583 | l_mg->emeta_alloc_type = PBLK_VMALLOC_META; | |
584 | ||
585 | emeta->buf = vmalloc(lm->emeta_len[0]); | |
586 | if (!emeta->buf) { | |
587 | kfree(emeta); | |
588 | goto fail_free_emeta; | |
589 | } | |
590 | ||
591 | emeta->nr_entries = lm->emeta_sec[0]; | |
592 | l_mg->eline_meta[i] = emeta; | |
593 | } else { | |
594 | l_mg->emeta_alloc_type = PBLK_KMALLOC_META; | |
595 | ||
596 | emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL); | |
597 | if (!emeta->buf) { | |
598 | kfree(emeta); | |
599 | goto fail_free_emeta; | |
600 | } | |
601 | ||
602 | emeta->nr_entries = lm->emeta_sec[0]; | |
603 | l_mg->eline_meta[i] = emeta; | |
604 | } | |
605 | } | |
606 | ||
607 | l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL); | |
608 | if (!l_mg->vsc_list) | |
609 | goto fail_free_emeta; | |
610 | ||
611 | for (i = 0; i < l_mg->nr_lines; i++) | |
612 | l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY); | |
613 | ||
614 | return 0; | |
615 | ||
616 | fail_free_emeta: | |
617 | while (--i >= 0) { | |
618 | vfree(l_mg->eline_meta[i]->buf); | |
f680f19a | 619 | kfree(l_mg->eline_meta[i]); |
dd2a4343 JG |
620 | } |
621 | ||
622 | fail_free_smeta: | |
623 | for (i = 0; i < PBLK_DATA_LINES; i++) | |
f680f19a | 624 | kfree(l_mg->sline_meta[i]); |
dd2a4343 JG |
625 | |
626 | return -ENOMEM; | |
627 | } | |
628 | ||
a4bd217b JG |
629 | static int pblk_lines_init(struct pblk *pblk) |
630 | { | |
631 | struct nvm_tgt_dev *dev = pblk->dev; | |
632 | struct nvm_geo *geo = &dev->geo; | |
633 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
634 | struct pblk_line_meta *lm = &pblk->lm; | |
635 | struct pblk_line *line; | |
636 | unsigned int smeta_len, emeta_len; | |
d624f371 | 637 | long nr_bad_blks, nr_free_blks; |
dd2a4343 JG |
638 | int bb_distance, max_write_ppas, mod; |
639 | int i, ret; | |
640 | ||
641 | pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE); | |
642 | max_write_ppas = pblk->min_write_pgs * geo->nr_luns; | |
643 | pblk->max_write_pgs = (max_write_ppas < nvm_max_phys_sects(dev)) ? | |
644 | max_write_ppas : nvm_max_phys_sects(dev); | |
645 | pblk_set_sec_per_write(pblk, pblk->min_write_pgs); | |
646 | ||
647 | if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) { | |
648 | pr_err("pblk: cannot support device max_phys_sect\n"); | |
649 | return -EINVAL; | |
650 | } | |
651 | ||
652 | div_u64_rem(geo->sec_per_blk, pblk->min_write_pgs, &mod); | |
653 | if (mod) { | |
654 | pr_err("pblk: bad configuration of sectors/pages\n"); | |
655 | return -EINVAL; | |
656 | } | |
657 | ||
658 | l_mg->nr_lines = geo->blks_per_lun; | |
659 | l_mg->log_line = l_mg->data_line = NULL; | |
660 | l_mg->l_seq_nr = l_mg->d_seq_nr = 0; | |
661 | l_mg->nr_free_lines = 0; | |
662 | bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES); | |
a4bd217b JG |
663 | |
664 | lm->sec_per_line = geo->sec_per_blk * geo->nr_luns; | |
665 | lm->blk_per_line = geo->nr_luns; | |
666 | lm->blk_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long); | |
667 | lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long); | |
668 | lm->lun_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long); | |
669 | lm->high_thrs = lm->sec_per_line / 2; | |
670 | lm->mid_thrs = lm->sec_per_line / 4; | |
dd2a4343 | 671 | lm->meta_distance = (geo->nr_luns / 2) * pblk->min_write_pgs; |
a4bd217b JG |
672 | |
673 | /* Calculate necessary pages for smeta. See comment over struct | |
674 | * line_smeta definition | |
675 | */ | |
a4bd217b JG |
676 | i = 1; |
677 | add_smeta_page: | |
678 | lm->smeta_sec = i * geo->sec_per_pl; | |
679 | lm->smeta_len = lm->smeta_sec * geo->sec_size; | |
680 | ||
dd2a4343 | 681 | smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len; |
a4bd217b JG |
682 | if (smeta_len > lm->smeta_len) { |
683 | i++; | |
684 | goto add_smeta_page; | |
685 | } | |
686 | ||
687 | /* Calculate necessary pages for emeta. See comment over struct | |
688 | * line_emeta definition | |
689 | */ | |
690 | i = 1; | |
691 | add_emeta_page: | |
dd2a4343 JG |
692 | lm->emeta_sec[0] = i * geo->sec_per_pl; |
693 | lm->emeta_len[0] = lm->emeta_sec[0] * geo->sec_size; | |
a4bd217b | 694 | |
dd2a4343 JG |
695 | emeta_len = calc_emeta_len(pblk); |
696 | if (emeta_len > lm->emeta_len[0]) { | |
a4bd217b JG |
697 | i++; |
698 | goto add_emeta_page; | |
699 | } | |
a4bd217b | 700 | |
dd2a4343 JG |
701 | lm->emeta_bb = geo->nr_luns - i; |
702 | lm->min_blk_line = 1 + DIV_ROUND_UP(lm->smeta_sec + lm->emeta_sec[0], | |
d624f371 | 703 | geo->sec_per_blk); |
a4bd217b | 704 | |
dd2a4343 JG |
705 | ret = pblk_lines_alloc_metadata(pblk); |
706 | if (ret) | |
707 | goto fail; | |
a4bd217b JG |
708 | |
709 | l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL); | |
1c6286f2 DC |
710 | if (!l_mg->bb_template) { |
711 | ret = -ENOMEM; | |
a4bd217b | 712 | goto fail_free_meta; |
1c6286f2 | 713 | } |
a4bd217b JG |
714 | |
715 | l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL); | |
1c6286f2 DC |
716 | if (!l_mg->bb_aux) { |
717 | ret = -ENOMEM; | |
a4bd217b | 718 | goto fail_free_bb_template; |
1c6286f2 | 719 | } |
a4bd217b JG |
720 | |
721 | bb_distance = (geo->nr_luns) * geo->sec_per_pl; | |
722 | for (i = 0; i < lm->sec_per_line; i += bb_distance) | |
723 | bitmap_set(l_mg->bb_template, i, geo->sec_per_pl); | |
724 | ||
725 | INIT_LIST_HEAD(&l_mg->free_list); | |
726 | INIT_LIST_HEAD(&l_mg->corrupt_list); | |
727 | INIT_LIST_HEAD(&l_mg->bad_list); | |
728 | INIT_LIST_HEAD(&l_mg->gc_full_list); | |
729 | INIT_LIST_HEAD(&l_mg->gc_high_list); | |
730 | INIT_LIST_HEAD(&l_mg->gc_mid_list); | |
731 | INIT_LIST_HEAD(&l_mg->gc_low_list); | |
732 | INIT_LIST_HEAD(&l_mg->gc_empty_list); | |
733 | ||
dd2a4343 JG |
734 | INIT_LIST_HEAD(&l_mg->emeta_list); |
735 | ||
a4bd217b JG |
736 | l_mg->gc_lists[0] = &l_mg->gc_high_list; |
737 | l_mg->gc_lists[1] = &l_mg->gc_mid_list; | |
738 | l_mg->gc_lists[2] = &l_mg->gc_low_list; | |
739 | ||
740 | spin_lock_init(&l_mg->free_lock); | |
dd2a4343 | 741 | spin_lock_init(&l_mg->close_lock); |
a4bd217b JG |
742 | spin_lock_init(&l_mg->gc_lock); |
743 | ||
744 | pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line), | |
745 | GFP_KERNEL); | |
1c6286f2 DC |
746 | if (!pblk->lines) { |
747 | ret = -ENOMEM; | |
a4bd217b | 748 | goto fail_free_bb_aux; |
1c6286f2 | 749 | } |
a4bd217b JG |
750 | |
751 | nr_free_blks = 0; | |
752 | for (i = 0; i < l_mg->nr_lines; i++) { | |
a44f53fa JG |
753 | int blk_in_line; |
754 | ||
a4bd217b JG |
755 | line = &pblk->lines[i]; |
756 | ||
757 | line->pblk = pblk; | |
758 | line->id = i; | |
759 | line->type = PBLK_LINETYPE_FREE; | |
760 | line->state = PBLK_LINESTATE_FREE; | |
761 | line->gc_group = PBLK_LINEGC_NONE; | |
dd2a4343 | 762 | line->vsc = &l_mg->vsc_list[i]; |
a4bd217b JG |
763 | spin_lock_init(&line->lock); |
764 | ||
dffdd960 JG |
765 | ret = pblk_alloc_line_bitmaps(pblk, line); |
766 | if (ret) | |
767 | goto fail_free_lines; | |
768 | ||
769 | nr_bad_blks = pblk_bb_line(pblk, line, lm->blk_per_line); | |
1c6286f2 | 770 | if (nr_bad_blks < 0 || nr_bad_blks > lm->blk_per_line) { |
dffdd960 | 771 | pblk_free_line_bitmaps(line); |
1c6286f2 | 772 | ret = -EINVAL; |
a4bd217b | 773 | goto fail_free_lines; |
1c6286f2 | 774 | } |
a4bd217b | 775 | |
a44f53fa JG |
776 | blk_in_line = lm->blk_per_line - nr_bad_blks; |
777 | if (blk_in_line < lm->min_blk_line) { | |
a4bd217b JG |
778 | line->state = PBLK_LINESTATE_BAD; |
779 | list_add_tail(&line->list, &l_mg->bad_list); | |
780 | continue; | |
781 | } | |
782 | ||
a44f53fa JG |
783 | nr_free_blks += blk_in_line; |
784 | atomic_set(&line->blk_in_line, blk_in_line); | |
a4bd217b JG |
785 | |
786 | l_mg->nr_free_lines++; | |
787 | list_add_tail(&line->list, &l_mg->free_list); | |
788 | } | |
789 | ||
790 | pblk_set_provision(pblk, nr_free_blks); | |
791 | ||
a4bd217b JG |
792 | /* Cleanup per-LUN bad block lists - managed within lines on run-time */ |
793 | for (i = 0; i < geo->nr_luns; i++) | |
794 | kfree(pblk->luns[i].bb_list); | |
795 | ||
796 | return 0; | |
797 | fail_free_lines: | |
dffdd960 JG |
798 | while (--i >= 0) |
799 | pblk_free_line_bitmaps(&pblk->lines[i]); | |
800 | ||
a4bd217b JG |
801 | kfree(pblk->lines); |
802 | fail_free_bb_aux: | |
803 | kfree(l_mg->bb_aux); | |
804 | fail_free_bb_template: | |
805 | kfree(l_mg->bb_template); | |
806 | fail_free_meta: | |
dd2a4343 | 807 | pblk_line_meta_free(pblk); |
a4bd217b JG |
808 | fail: |
809 | for (i = 0; i < geo->nr_luns; i++) | |
810 | kfree(pblk->luns[i].bb_list); | |
811 | ||
812 | return ret; | |
813 | } | |
814 | ||
815 | static int pblk_writer_init(struct pblk *pblk) | |
816 | { | |
817 | setup_timer(&pblk->wtimer, pblk_write_timer_fn, (unsigned long)pblk); | |
818 | mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100)); | |
819 | ||
820 | pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t"); | |
821 | if (IS_ERR(pblk->writer_ts)) { | |
822 | pr_err("pblk: could not allocate writer kthread\n"); | |
1c6286f2 | 823 | return PTR_ERR(pblk->writer_ts); |
a4bd217b JG |
824 | } |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static void pblk_writer_stop(struct pblk *pblk) | |
830 | { | |
831 | if (pblk->writer_ts) | |
832 | kthread_stop(pblk->writer_ts); | |
833 | del_timer(&pblk->wtimer); | |
834 | } | |
835 | ||
836 | static void pblk_free(struct pblk *pblk) | |
837 | { | |
838 | pblk_luns_free(pblk); | |
839 | pblk_lines_free(pblk); | |
840 | pblk_line_meta_free(pblk); | |
841 | pblk_core_free(pblk); | |
842 | pblk_l2p_free(pblk); | |
843 | ||
844 | kfree(pblk); | |
845 | } | |
846 | ||
847 | static void pblk_tear_down(struct pblk *pblk) | |
848 | { | |
849 | pblk_flush_writer(pblk); | |
850 | pblk_writer_stop(pblk); | |
851 | pblk_rb_sync_l2p(&pblk->rwb); | |
852 | pblk_recov_pad(pblk); | |
853 | pblk_rwb_free(pblk); | |
854 | pblk_rl_free(&pblk->rl); | |
855 | ||
856 | pr_debug("pblk: consistent tear down\n"); | |
857 | } | |
858 | ||
859 | static void pblk_exit(void *private) | |
860 | { | |
861 | struct pblk *pblk = private; | |
862 | ||
863 | down_write(&pblk_lock); | |
864 | pblk_gc_exit(pblk); | |
865 | pblk_tear_down(pblk); | |
866 | pblk_free(pblk); | |
867 | up_write(&pblk_lock); | |
868 | } | |
869 | ||
870 | static sector_t pblk_capacity(void *private) | |
871 | { | |
872 | struct pblk *pblk = private; | |
873 | ||
874 | return pblk->capacity * NR_PHY_IN_LOG; | |
875 | } | |
876 | ||
877 | static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, | |
878 | int flags) | |
879 | { | |
880 | struct nvm_geo *geo = &dev->geo; | |
881 | struct request_queue *bqueue = dev->q; | |
882 | struct request_queue *tqueue = tdisk->queue; | |
883 | struct pblk *pblk; | |
884 | int ret; | |
885 | ||
886 | if (dev->identity.dom & NVM_RSP_L2P) { | |
887 | pr_err("pblk: device-side L2P table not supported. (%x)\n", | |
888 | dev->identity.dom); | |
889 | return ERR_PTR(-EINVAL); | |
890 | } | |
891 | ||
892 | pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL); | |
893 | if (!pblk) | |
894 | return ERR_PTR(-ENOMEM); | |
895 | ||
896 | pblk->dev = dev; | |
897 | pblk->disk = tdisk; | |
898 | ||
899 | spin_lock_init(&pblk->trans_lock); | |
900 | spin_lock_init(&pblk->lock); | |
901 | ||
902 | if (flags & NVM_TARGET_FACTORY) | |
903 | pblk_setup_uuid(pblk); | |
904 | ||
905 | #ifdef CONFIG_NVM_DEBUG | |
906 | atomic_long_set(&pblk->inflight_writes, 0); | |
907 | atomic_long_set(&pblk->padded_writes, 0); | |
908 | atomic_long_set(&pblk->padded_wb, 0); | |
909 | atomic_long_set(&pblk->nr_flush, 0); | |
910 | atomic_long_set(&pblk->req_writes, 0); | |
911 | atomic_long_set(&pblk->sub_writes, 0); | |
912 | atomic_long_set(&pblk->sync_writes, 0); | |
a4bd217b | 913 | atomic_long_set(&pblk->inflight_reads, 0); |
db7ada33 | 914 | atomic_long_set(&pblk->cache_reads, 0); |
a4bd217b JG |
915 | atomic_long_set(&pblk->sync_reads, 0); |
916 | atomic_long_set(&pblk->recov_writes, 0); | |
917 | atomic_long_set(&pblk->recov_writes, 0); | |
918 | atomic_long_set(&pblk->recov_gc_writes, 0); | |
919 | #endif | |
920 | ||
921 | atomic_long_set(&pblk->read_failed, 0); | |
922 | atomic_long_set(&pblk->read_empty, 0); | |
923 | atomic_long_set(&pblk->read_high_ecc, 0); | |
924 | atomic_long_set(&pblk->read_failed_gc, 0); | |
925 | atomic_long_set(&pblk->write_failed, 0); | |
926 | atomic_long_set(&pblk->erase_failed, 0); | |
927 | ||
928 | ret = pblk_luns_init(pblk, dev->luns); | |
929 | if (ret) { | |
930 | pr_err("pblk: could not initialize luns\n"); | |
931 | goto fail; | |
932 | } | |
933 | ||
934 | ret = pblk_lines_init(pblk); | |
935 | if (ret) { | |
936 | pr_err("pblk: could not initialize lines\n"); | |
937 | goto fail_free_luns; | |
938 | } | |
939 | ||
940 | ret = pblk_core_init(pblk); | |
941 | if (ret) { | |
942 | pr_err("pblk: could not initialize core\n"); | |
943 | goto fail_free_line_meta; | |
944 | } | |
945 | ||
946 | ret = pblk_l2p_init(pblk); | |
947 | if (ret) { | |
948 | pr_err("pblk: could not initialize maps\n"); | |
949 | goto fail_free_core; | |
950 | } | |
951 | ||
952 | ret = pblk_lines_configure(pblk, flags); | |
953 | if (ret) { | |
954 | pr_err("pblk: could not configure lines\n"); | |
955 | goto fail_free_l2p; | |
956 | } | |
957 | ||
958 | ret = pblk_writer_init(pblk); | |
959 | if (ret) { | |
960 | pr_err("pblk: could not initialize write thread\n"); | |
961 | goto fail_free_lines; | |
962 | } | |
963 | ||
964 | ret = pblk_gc_init(pblk); | |
965 | if (ret) { | |
966 | pr_err("pblk: could not initialize gc\n"); | |
967 | goto fail_stop_writer; | |
968 | } | |
969 | ||
970 | /* inherit the size from the underlying device */ | |
971 | blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue)); | |
972 | blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue)); | |
973 | ||
974 | blk_queue_write_cache(tqueue, true, false); | |
975 | ||
976 | tqueue->limits.discard_granularity = geo->pgs_per_blk * geo->pfpg_size; | |
977 | tqueue->limits.discard_alignment = 0; | |
978 | blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9); | |
979 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, tqueue); | |
980 | ||
981 | pr_info("pblk init: luns:%u, lines:%d, secs:%llu, buf entries:%u\n", | |
982 | geo->nr_luns, pblk->l_mg.nr_lines, | |
983 | (unsigned long long)pblk->rl.nr_secs, | |
984 | pblk->rwb.nr_entries); | |
985 | ||
986 | wake_up_process(pblk->writer_ts); | |
987 | return pblk; | |
988 | ||
989 | fail_stop_writer: | |
990 | pblk_writer_stop(pblk); | |
991 | fail_free_lines: | |
992 | pblk_lines_free(pblk); | |
993 | fail_free_l2p: | |
994 | pblk_l2p_free(pblk); | |
995 | fail_free_core: | |
996 | pblk_core_free(pblk); | |
997 | fail_free_line_meta: | |
998 | pblk_line_meta_free(pblk); | |
999 | fail_free_luns: | |
1000 | pblk_luns_free(pblk); | |
1001 | fail: | |
1002 | kfree(pblk); | |
1003 | return ERR_PTR(ret); | |
1004 | } | |
1005 | ||
1006 | /* physical block device target */ | |
1007 | static struct nvm_tgt_type tt_pblk = { | |
1008 | .name = "pblk", | |
1009 | .version = {1, 0, 0}, | |
1010 | ||
1011 | .make_rq = pblk_make_rq, | |
1012 | .capacity = pblk_capacity, | |
1013 | ||
1014 | .init = pblk_init, | |
1015 | .exit = pblk_exit, | |
1016 | ||
1017 | .sysfs_init = pblk_sysfs_init, | |
1018 | .sysfs_exit = pblk_sysfs_exit, | |
1019 | }; | |
1020 | ||
1021 | static int __init pblk_module_init(void) | |
1022 | { | |
b25d5237 N |
1023 | int ret; |
1024 | ||
1025 | pblk_bio_set = bioset_create(BIO_POOL_SIZE, 0, 0); | |
1026 | if (!pblk_bio_set) | |
1027 | return -ENOMEM; | |
1028 | ret = nvm_register_tgt_type(&tt_pblk); | |
1029 | if (ret) | |
1030 | bioset_free(pblk_bio_set); | |
1031 | return ret; | |
a4bd217b JG |
1032 | } |
1033 | ||
1034 | static void pblk_module_exit(void) | |
1035 | { | |
b25d5237 | 1036 | bioset_free(pblk_bio_set); |
a4bd217b JG |
1037 | nvm_unregister_tgt_type(&tt_pblk); |
1038 | } | |
1039 | ||
1040 | module_init(pblk_module_init); | |
1041 | module_exit(pblk_module_exit); | |
1042 | MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>"); | |
1043 | MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>"); | |
1044 | MODULE_LICENSE("GPL v2"); | |
1045 | MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs"); |