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02a1520d | 1 | // SPDX-License-Identifier: GPL-2.0 |
a4bd217b JG |
2 | /* |
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 | * pblk-write.c - pblk's write path from write buffer to media | |
17 | */ | |
18 | ||
19 | #include "pblk.h" | |
4c44abf4 | 20 | #include "pblk-trace.h" |
a4bd217b | 21 | |
a4bd217b JG |
22 | static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd, |
23 | struct pblk_c_ctx *c_ctx) | |
24 | { | |
a4bd217b | 25 | struct bio *original_bio; |
533657c1 | 26 | struct pblk_rb *rwb = &pblk->rwb; |
a4bd217b JG |
27 | unsigned long ret; |
28 | int i; | |
29 | ||
30 | for (i = 0; i < c_ctx->nr_valid; i++) { | |
31 | struct pblk_w_ctx *w_ctx; | |
533657c1 HH |
32 | int pos = c_ctx->sentry + i; |
33 | int flags; | |
34 | ||
35 | w_ctx = pblk_rb_w_ctx(rwb, pos); | |
36 | flags = READ_ONCE(w_ctx->flags); | |
37 | ||
38 | if (flags & PBLK_FLUSH_ENTRY) { | |
39 | flags &= ~PBLK_FLUSH_ENTRY; | |
40 | /* Release flags on context. Protect from writes */ | |
41 | smp_store_release(&w_ctx->flags, flags); | |
42 | ||
880eda54 | 43 | #ifdef CONFIG_NVM_PBLK_DEBUG |
533657c1 HH |
44 | atomic_dec(&rwb->inflight_flush_point); |
45 | #endif | |
46 | } | |
a4bd217b | 47 | |
a4bd217b JG |
48 | while ((original_bio = bio_list_pop(&w_ctx->bios))) |
49 | bio_endio(original_bio); | |
50 | } | |
51 | ||
cd8ddbf7 JG |
52 | if (c_ctx->nr_padded) |
53 | pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, | |
54 | c_ctx->nr_padded); | |
55 | ||
880eda54 | 56 | #ifdef CONFIG_NVM_PBLK_DEBUG |
e0e12a70 | 57 | atomic_long_add(rqd->nr_ppas, &pblk->sync_writes); |
a4bd217b JG |
58 | #endif |
59 | ||
60 | ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid); | |
61 | ||
a4bd217b | 62 | bio_put(rqd->bio); |
e2cddf20 | 63 | pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
a4bd217b JG |
64 | |
65 | return ret; | |
66 | } | |
67 | ||
68 | static unsigned long pblk_end_queued_w_bio(struct pblk *pblk, | |
69 | struct nvm_rq *rqd, | |
70 | struct pblk_c_ctx *c_ctx) | |
71 | { | |
72 | list_del(&c_ctx->list); | |
73 | return pblk_end_w_bio(pblk, rqd, c_ctx); | |
74 | } | |
75 | ||
76 | static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd, | |
77 | struct pblk_c_ctx *c_ctx) | |
78 | { | |
79 | struct pblk_c_ctx *c, *r; | |
80 | unsigned long flags; | |
81 | unsigned long pos; | |
82 | ||
880eda54 | 83 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
84 | atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes); |
85 | #endif | |
e99e802f | 86 | pblk_up_rq(pblk, c_ctx->lun_bitmap); |
a4bd217b JG |
87 | |
88 | pos = pblk_rb_sync_init(&pblk->rwb, &flags); | |
89 | if (pos == c_ctx->sentry) { | |
90 | pos = pblk_end_w_bio(pblk, rqd, c_ctx); | |
91 | ||
92 | retry: | |
93 | list_for_each_entry_safe(c, r, &pblk->compl_list, list) { | |
94 | rqd = nvm_rq_from_c_ctx(c); | |
95 | if (c->sentry == pos) { | |
96 | pos = pblk_end_queued_w_bio(pblk, rqd, c); | |
97 | goto retry; | |
98 | } | |
99 | } | |
100 | } else { | |
101 | WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd); | |
102 | list_add_tail(&c_ctx->list, &pblk->compl_list); | |
103 | } | |
104 | pblk_rb_sync_end(&pblk->rwb, &flags); | |
105 | } | |
106 | ||
6a3abf5b | 107 | /* Map remaining sectors in chunk, starting from ppa */ |
ab3887be HH |
108 | static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa, |
109 | int rqd_ppas) | |
a4bd217b | 110 | { |
6a3abf5b HH |
111 | struct pblk_line *line; |
112 | struct ppa_addr map_ppa = *ppa; | |
ab3887be HH |
113 | __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); |
114 | __le64 *lba_list; | |
6a3abf5b HH |
115 | u64 paddr; |
116 | int done = 0; | |
ab3887be | 117 | int n = 0; |
a4bd217b | 118 | |
cb21665c | 119 | line = pblk_ppa_to_line(pblk, *ppa); |
ab3887be HH |
120 | lba_list = emeta_to_lbas(pblk, line->emeta->buf); |
121 | ||
6a3abf5b | 122 | spin_lock(&line->lock); |
a4bd217b | 123 | |
6a3abf5b HH |
124 | while (!done) { |
125 | paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa); | |
2942f50f | 126 | |
6a3abf5b HH |
127 | if (!test_and_set_bit(paddr, line->map_bitmap)) |
128 | line->left_msecs--; | |
a4bd217b | 129 | |
ab3887be HH |
130 | if (n < rqd_ppas && lba_list[paddr] != addr_empty) |
131 | line->nr_valid_lbas--; | |
132 | ||
133 | lba_list[paddr] = addr_empty; | |
134 | ||
6a3abf5b HH |
135 | if (!test_and_set_bit(paddr, line->invalid_bitmap)) |
136 | le32_add_cpu(line->vsc, -1); | |
a4bd217b | 137 | |
bf82fa2f | 138 | done = nvm_next_ppa_in_chk(pblk->dev, &map_ppa); |
ab3887be HH |
139 | |
140 | n++; | |
6a3abf5b | 141 | } |
a4bd217b | 142 | |
48b8d208 | 143 | line->w_err_gc->has_write_err = 1; |
6a3abf5b HH |
144 | spin_unlock(&line->lock); |
145 | } | |
146 | ||
147 | static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry, | |
148 | unsigned int nr_entries) | |
149 | { | |
150 | struct pblk_rb *rb = &pblk->rwb; | |
151 | struct pblk_rb_entry *entry; | |
152 | struct pblk_line *line; | |
153 | struct pblk_w_ctx *w_ctx; | |
154 | struct ppa_addr ppa_l2p; | |
155 | int flags; | |
40b8657d | 156 | unsigned int i; |
6a3abf5b HH |
157 | |
158 | spin_lock(&pblk->trans_lock); | |
6a3abf5b | 159 | for (i = 0; i < nr_entries; i++) { |
40b8657d | 160 | entry = &rb->entries[pblk_rb_ptr_wrap(rb, sentry, i)]; |
6a3abf5b HH |
161 | w_ctx = &entry->w_ctx; |
162 | ||
163 | /* Check if the lba has been overwritten */ | |
c12fa401 HH |
164 | if (w_ctx->lba != ADDR_EMPTY) { |
165 | ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba); | |
166 | if (!pblk_ppa_comp(ppa_l2p, entry->cacheline)) | |
167 | w_ctx->lba = ADDR_EMPTY; | |
168 | } | |
6a3abf5b HH |
169 | |
170 | /* Mark up the entry as submittable again */ | |
171 | flags = READ_ONCE(w_ctx->flags); | |
172 | flags |= PBLK_WRITTEN_DATA; | |
173 | /* Release flags on write context. Protect from writes */ | |
174 | smp_store_release(&w_ctx->flags, flags); | |
a4bd217b | 175 | |
2e696f90 | 176 | /* Decrease the reference count to the line as we will |
6a3abf5b | 177 | * re-map these entries |
a4bd217b | 178 | */ |
cb21665c | 179 | line = pblk_ppa_to_line(pblk, w_ctx->ppa); |
0586942f | 180 | atomic_dec(&line->sec_to_update); |
6a3abf5b | 181 | kref_put(&line->ref, pblk_line_put); |
a4bd217b | 182 | } |
6a3abf5b HH |
183 | spin_unlock(&pblk->trans_lock); |
184 | } | |
a4bd217b | 185 | |
6a3abf5b HH |
186 | static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx) |
187 | { | |
188 | struct pblk_c_ctx *r_ctx; | |
189 | ||
190 | r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL); | |
191 | if (!r_ctx) | |
192 | return; | |
193 | ||
194 | r_ctx->lun_bitmap = NULL; | |
195 | r_ctx->sentry = c_ctx->sentry; | |
196 | r_ctx->nr_valid = c_ctx->nr_valid; | |
197 | r_ctx->nr_padded = c_ctx->nr_padded; | |
198 | ||
199 | spin_lock(&pblk->resubmit_lock); | |
200 | list_add_tail(&r_ctx->list, &pblk->resubmit_list); | |
201 | spin_unlock(&pblk->resubmit_lock); | |
202 | ||
880eda54 | 203 | #ifdef CONFIG_NVM_PBLK_DEBUG |
6a3abf5b HH |
204 | atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes); |
205 | #endif | |
206 | } | |
207 | ||
208 | static void pblk_submit_rec(struct work_struct *work) | |
209 | { | |
210 | struct pblk_rec_ctx *recovery = | |
211 | container_of(work, struct pblk_rec_ctx, ws_rec); | |
212 | struct pblk *pblk = recovery->pblk; | |
213 | struct nvm_rq *rqd = recovery->rqd; | |
214 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
d68a9344 | 215 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
6a3abf5b HH |
216 | |
217 | pblk_log_write_err(pblk, rqd); | |
218 | ||
ab3887be | 219 | pblk_map_remaining(pblk, ppa_list, rqd->nr_ppas); |
6a3abf5b HH |
220 | pblk_queue_resubmit(pblk, c_ctx); |
221 | ||
e99e802f | 222 | pblk_up_rq(pblk, c_ctx->lun_bitmap); |
6a3abf5b HH |
223 | if (c_ctx->nr_padded) |
224 | pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, | |
225 | c_ctx->nr_padded); | |
226 | bio_put(rqd->bio); | |
227 | pblk_free_rqd(pblk, rqd, PBLK_WRITE); | |
228 | mempool_free(recovery, &pblk->rec_pool); | |
229 | ||
230 | atomic_dec(&pblk->inflight_io); | |
74a37fbb | 231 | pblk_write_kick(pblk); |
6a3abf5b HH |
232 | } |
233 | ||
234 | ||
235 | static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd) | |
236 | { | |
237 | struct pblk_rec_ctx *recovery; | |
238 | ||
239 | recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC); | |
240 | if (!recovery) { | |
4e495a46 | 241 | pblk_err(pblk, "could not allocate recovery work\n"); |
6a3abf5b | 242 | return; |
a4bd217b JG |
243 | } |
244 | ||
6a3abf5b HH |
245 | recovery->pblk = pblk; |
246 | recovery->rqd = rqd; | |
247 | ||
a4bd217b | 248 | INIT_WORK(&recovery->ws_rec, pblk_submit_rec); |
ef576494 | 249 | queue_work(pblk->close_wq, &recovery->ws_rec); |
a4bd217b JG |
250 | } |
251 | ||
252 | static void pblk_end_io_write(struct nvm_rq *rqd) | |
253 | { | |
254 | struct pblk *pblk = rqd->private; | |
255 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
256 | ||
257 | if (rqd->error) { | |
6a3abf5b HH |
258 | pblk_end_w_fail(pblk, rqd); |
259 | return; | |
4c44abf4 HH |
260 | } else { |
261 | if (trace_pblk_chunk_state_enabled()) | |
262 | pblk_check_chunk_state_update(pblk, rqd); | |
880eda54 | 263 | #ifdef CONFIG_NVM_PBLK_DEBUG |
4e4cbee9 | 264 | WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n"); |
a4bd217b | 265 | #endif |
4c44abf4 | 266 | } |
a4bd217b JG |
267 | |
268 | pblk_complete_write(pblk, rqd, c_ctx); | |
588726d3 | 269 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
270 | } |
271 | ||
dd2a4343 JG |
272 | static void pblk_end_io_write_meta(struct nvm_rq *rqd) |
273 | { | |
274 | struct pblk *pblk = rqd->private; | |
dd2a4343 JG |
275 | struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd); |
276 | struct pblk_line *line = m_ctx->private; | |
277 | struct pblk_emeta *emeta = line->emeta; | |
d68a9344 | 278 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
dd2a4343 JG |
279 | int sync; |
280 | ||
43241cfe | 281 | pblk_up_chunk(pblk, ppa_list[0]); |
dd2a4343 JG |
282 | |
283 | if (rqd->error) { | |
284 | pblk_log_write_err(pblk, rqd); | |
4e495a46 | 285 | pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id); |
48b8d208 | 286 | line->w_err_gc->has_write_err = 1; |
4c44abf4 HH |
287 | } else { |
288 | if (trace_pblk_chunk_state_enabled()) | |
289 | pblk_check_chunk_state_update(pblk, rqd); | |
dd2a4343 | 290 | } |
dd2a4343 JG |
291 | |
292 | sync = atomic_add_return(rqd->nr_ppas, &emeta->sync); | |
293 | if (sync == emeta->nr_entries) | |
b84ae4a8 JG |
294 | pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws, |
295 | GFP_ATOMIC, pblk->close_wq); | |
dd2a4343 | 296 | |
e2cddf20 | 297 | pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); |
588726d3 JG |
298 | |
299 | atomic_dec(&pblk->inflight_io); | |
dd2a4343 JG |
300 | } |
301 | ||
a4bd217b | 302 | static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd, |
45dcf29b | 303 | unsigned int nr_secs, nvm_end_io_fn(*end_io)) |
a4bd217b | 304 | { |
a4bd217b JG |
305 | /* Setup write request */ |
306 | rqd->opcode = NVM_OP_PWRITE; | |
307 | rqd->nr_ppas = nr_secs; | |
d7b68016 | 308 | rqd->is_seq = 1; |
a4bd217b | 309 | rqd->private = pblk; |
dd2a4343 | 310 | rqd->end_io = end_io; |
a4bd217b | 311 | |
45dcf29b | 312 | return pblk_alloc_rqd_meta(pblk, rqd); |
a4bd217b JG |
313 | } |
314 | ||
315 | static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
1e82123d | 316 | struct ppa_addr *erase_ppa) |
a4bd217b JG |
317 | { |
318 | struct pblk_line_meta *lm = &pblk->lm; | |
d624f371 | 319 | struct pblk_line *e_line = pblk_line_get_erase(pblk); |
1e82123d | 320 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); |
a4bd217b JG |
321 | unsigned int valid = c_ctx->nr_valid; |
322 | unsigned int padded = c_ctx->nr_padded; | |
323 | unsigned int nr_secs = valid + padded; | |
324 | unsigned long *lun_bitmap; | |
1e82123d | 325 | int ret; |
a4bd217b JG |
326 | |
327 | lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL); | |
d624f371 JG |
328 | if (!lun_bitmap) |
329 | return -ENOMEM; | |
a4bd217b JG |
330 | c_ctx->lun_bitmap = lun_bitmap; |
331 | ||
dd2a4343 | 332 | ret = pblk_alloc_w_rq(pblk, rqd, nr_secs, pblk_end_io_write); |
a4bd217b JG |
333 | if (ret) { |
334 | kfree(lun_bitmap); | |
d624f371 | 335 | return ret; |
a4bd217b JG |
336 | } |
337 | ||
588726d3 | 338 | if (likely(!e_line || !atomic_read(&e_line->left_eblks))) |
525f7bb2 HH |
339 | ret = pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, |
340 | valid, 0); | |
a4bd217b | 341 | else |
525f7bb2 | 342 | ret = pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, |
d624f371 | 343 | valid, erase_ppa); |
a4bd217b | 344 | |
525f7bb2 | 345 | return ret; |
a4bd217b JG |
346 | } |
347 | ||
a4bd217b JG |
348 | static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail, |
349 | unsigned int secs_to_flush) | |
350 | { | |
351 | int secs_to_sync; | |
352 | ||
55d8ec35 | 353 | secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush, true); |
a4bd217b | 354 | |
880eda54 | 355 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
356 | if ((!secs_to_sync && secs_to_flush) |
357 | || (secs_to_sync < 0) | |
358 | || (secs_to_sync > secs_avail && !secs_to_flush)) { | |
4e495a46 | 359 | pblk_err(pblk, "bad sector calculation (a:%d,s:%d,f:%d)\n", |
a4bd217b JG |
360 | secs_avail, secs_to_sync, secs_to_flush); |
361 | } | |
362 | #endif | |
363 | ||
364 | return secs_to_sync; | |
365 | } | |
366 | ||
dd2a4343 JG |
367 | int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) |
368 | { | |
369 | struct nvm_tgt_dev *dev = pblk->dev; | |
370 | struct nvm_geo *geo = &dev->geo; | |
371 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
372 | struct pblk_line_meta *lm = &pblk->lm; | |
373 | struct pblk_emeta *emeta = meta_line->emeta; | |
d68a9344 | 374 | struct ppa_addr *ppa_list; |
dd2a4343 | 375 | struct pblk_g_ctx *m_ctx; |
dd2a4343 JG |
376 | struct nvm_rq *rqd; |
377 | void *data; | |
378 | u64 paddr; | |
379 | int rq_ppas = pblk->min_write_pgs; | |
380 | int id = meta_line->id; | |
381 | int rq_len; | |
382 | int i, j; | |
383 | int ret; | |
384 | ||
e2cddf20 | 385 | rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); |
2942f50f | 386 | |
dd2a4343 JG |
387 | m_ctx = nvm_rq_to_pdu(rqd); |
388 | m_ctx->private = meta_line; | |
389 | ||
e46f4e48 | 390 | rq_len = rq_ppas * geo->csecs; |
dd2a4343 JG |
391 | data = ((void *)emeta->buf) + emeta->mem; |
392 | ||
dd2a4343 JG |
393 | ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta); |
394 | if (ret) | |
48e5da72 | 395 | goto fail_free_rqd; |
dd2a4343 | 396 | |
d68a9344 | 397 | ppa_list = nvm_rq_to_ppa_list(rqd); |
dd2a4343 JG |
398 | for (i = 0; i < rqd->nr_ppas; ) { |
399 | spin_lock(&meta_line->lock); | |
400 | paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas); | |
401 | spin_unlock(&meta_line->lock); | |
402 | for (j = 0; j < rq_ppas; j++, i++, paddr++) | |
d68a9344 | 403 | ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id); |
dd2a4343 JG |
404 | } |
405 | ||
d8adaa3b | 406 | spin_lock(&l_mg->close_lock); |
dd2a4343 | 407 | emeta->mem += rq_len; |
d8adaa3b | 408 | if (emeta->mem >= lm->emeta_len[0]) |
dd2a4343 | 409 | list_del(&meta_line->list); |
d8adaa3b | 410 | spin_unlock(&l_mg->close_lock); |
dd2a4343 | 411 | |
43241cfe | 412 | pblk_down_chunk(pblk, ppa_list[0]); |
3eaa11e2 | 413 | |
48e5da72 | 414 | ret = pblk_submit_io(pblk, rqd, data); |
dd2a4343 | 415 | if (ret) { |
4e495a46 | 416 | pblk_err(pblk, "emeta I/O submission failed: %d\n", ret); |
dd2a4343 JG |
417 | goto fail_rollback; |
418 | } | |
419 | ||
420 | return NVM_IO_OK; | |
421 | ||
422 | fail_rollback: | |
43241cfe | 423 | pblk_up_chunk(pblk, ppa_list[0]); |
dd2a4343 JG |
424 | spin_lock(&l_mg->close_lock); |
425 | pblk_dealloc_page(pblk, meta_line, rq_ppas); | |
426 | list_add(&meta_line->list, &meta_line->list); | |
427 | spin_unlock(&l_mg->close_lock); | |
dd2a4343 | 428 | fail_free_rqd: |
e2cddf20 | 429 | pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); |
dd2a4343 JG |
430 | return ret; |
431 | } | |
432 | ||
1e82123d JG |
433 | static inline bool pblk_valid_meta_ppa(struct pblk *pblk, |
434 | struct pblk_line *meta_line, | |
435 | struct nvm_rq *data_rqd) | |
436 | { | |
437 | struct nvm_tgt_dev *dev = pblk->dev; | |
438 | struct nvm_geo *geo = &dev->geo; | |
439 | struct pblk_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd); | |
440 | struct pblk_line *data_line = pblk_line_get_data(pblk); | |
441 | struct ppa_addr ppa, ppa_opt; | |
442 | u64 paddr; | |
443 | int pos_opt; | |
444 | ||
445 | /* Schedule a metadata I/O that is half the distance from the data I/O | |
446 | * with regards to the number of LUNs forming the pblk instance. This | |
447 | * balances LUN conflicts across every I/O. | |
448 | * | |
449 | * When the LUN configuration changes (e.g., due to GC), this distance | |
450 | * can align, which would result on metadata and data I/Os colliding. In | |
451 | * this case, modify the distance to not be optimal, but move the | |
452 | * optimal in the right direction. | |
453 | */ | |
454 | paddr = pblk_lookup_page(pblk, meta_line); | |
455 | ppa = addr_to_gen_ppa(pblk, paddr, 0); | |
456 | ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0); | |
457 | pos_opt = pblk_ppa_to_pos(geo, ppa_opt); | |
458 | ||
459 | if (test_bit(pos_opt, data_c_ctx->lun_bitmap) || | |
460 | test_bit(pos_opt, data_line->blk_bitmap)) | |
461 | return true; | |
462 | ||
463 | if (unlikely(pblk_ppa_comp(ppa_opt, ppa))) | |
464 | data_line->meta_distance--; | |
465 | ||
466 | return false; | |
467 | } | |
468 | ||
469 | static struct pblk_line *pblk_should_submit_meta_io(struct pblk *pblk, | |
470 | struct nvm_rq *data_rqd) | |
dd2a4343 JG |
471 | { |
472 | struct pblk_line_meta *lm = &pblk->lm; | |
473 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
474 | struct pblk_line *meta_line; | |
475 | ||
476 | spin_lock(&l_mg->close_lock); | |
dd2a4343 JG |
477 | if (list_empty(&l_mg->emeta_list)) { |
478 | spin_unlock(&l_mg->close_lock); | |
1e82123d | 479 | return NULL; |
dd2a4343 JG |
480 | } |
481 | meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list); | |
d8adaa3b JG |
482 | if (meta_line->emeta->mem >= lm->emeta_len[0]) { |
483 | spin_unlock(&l_mg->close_lock); | |
484 | return NULL; | |
485 | } | |
dd2a4343 JG |
486 | spin_unlock(&l_mg->close_lock); |
487 | ||
1e82123d JG |
488 | if (!pblk_valid_meta_ppa(pblk, meta_line, data_rqd)) |
489 | return NULL; | |
dd2a4343 | 490 | |
1e82123d | 491 | return meta_line; |
dd2a4343 JG |
492 | } |
493 | ||
d624f371 JG |
494 | static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd) |
495 | { | |
d624f371 | 496 | struct ppa_addr erase_ppa; |
1e82123d | 497 | struct pblk_line *meta_line; |
d624f371 JG |
498 | int err; |
499 | ||
26f76dce | 500 | pblk_ppa_set_empty(&erase_ppa); |
d624f371 JG |
501 | |
502 | /* Assign lbas to ppas and populate request structure */ | |
1e82123d | 503 | err = pblk_setup_w_rq(pblk, rqd, &erase_ppa); |
d624f371 | 504 | if (err) { |
4e495a46 | 505 | pblk_err(pblk, "could not setup write request: %d\n", err); |
d624f371 JG |
506 | return NVM_IO_ERR; |
507 | } | |
508 | ||
1e82123d | 509 | meta_line = pblk_should_submit_meta_io(pblk, rqd); |
dd2a4343 | 510 | |
1e82123d | 511 | /* Submit data write for current data line */ |
48e5da72 | 512 | err = pblk_submit_io(pblk, rqd, NULL); |
1e82123d | 513 | if (err) { |
4e495a46 | 514 | pblk_err(pblk, "data I/O submission failed: %d\n", err); |
1e82123d JG |
515 | return NVM_IO_ERR; |
516 | } | |
d624f371 | 517 | |
26f76dce | 518 | if (!pblk_ppa_empty(erase_ppa)) { |
1e82123d | 519 | /* Submit erase for next data line */ |
dd2a4343 JG |
520 | if (pblk_blk_erase_async(pblk, erase_ppa)) { |
521 | struct pblk_line *e_line = pblk_line_get_erase(pblk); | |
522 | struct nvm_tgt_dev *dev = pblk->dev; | |
523 | struct nvm_geo *geo = &dev->geo; | |
524 | int bit; | |
525 | ||
526 | atomic_inc(&e_line->left_eblks); | |
527 | bit = pblk_ppa_to_pos(geo, erase_ppa); | |
528 | WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap)); | |
529 | } | |
d624f371 JG |
530 | } |
531 | ||
1e82123d JG |
532 | if (meta_line) { |
533 | /* Submit metadata write for previous data line */ | |
534 | err = pblk_submit_meta_io(pblk, meta_line); | |
535 | if (err) { | |
4e495a46 MB |
536 | pblk_err(pblk, "metadata I/O submission failed: %d", |
537 | err); | |
1e82123d JG |
538 | return NVM_IO_ERR; |
539 | } | |
540 | } | |
541 | ||
d624f371 JG |
542 | return NVM_IO_OK; |
543 | } | |
544 | ||
545 | static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd) | |
546 | { | |
547 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
548 | struct bio *bio = rqd->bio; | |
549 | ||
550 | if (c_ctx->nr_padded) | |
cd8ddbf7 JG |
551 | pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid, |
552 | c_ctx->nr_padded); | |
d624f371 JG |
553 | } |
554 | ||
525f7bb2 | 555 | static int pblk_submit_write(struct pblk *pblk, int *secs_left) |
a4bd217b JG |
556 | { |
557 | struct bio *bio; | |
558 | struct nvm_rq *rqd; | |
a4bd217b | 559 | unsigned int secs_avail, secs_to_sync, secs_to_com; |
55d8ec35 | 560 | unsigned int secs_to_flush, packed_meta_pgs; |
a4bd217b | 561 | unsigned long pos; |
6a3abf5b | 562 | unsigned int resubmit; |
a4bd217b | 563 | |
525f7bb2 HH |
564 | *secs_left = 0; |
565 | ||
6a3abf5b HH |
566 | spin_lock(&pblk->resubmit_lock); |
567 | resubmit = !list_empty(&pblk->resubmit_list); | |
568 | spin_unlock(&pblk->resubmit_lock); | |
569 | ||
570 | /* Resubmit failed writes first */ | |
571 | if (resubmit) { | |
572 | struct pblk_c_ctx *r_ctx; | |
573 | ||
574 | spin_lock(&pblk->resubmit_lock); | |
575 | r_ctx = list_first_entry(&pblk->resubmit_list, | |
576 | struct pblk_c_ctx, list); | |
577 | list_del(&r_ctx->list); | |
578 | spin_unlock(&pblk->resubmit_lock); | |
579 | ||
580 | secs_avail = r_ctx->nr_valid; | |
581 | pos = r_ctx->sentry; | |
582 | ||
583 | pblk_prepare_resubmit(pblk, pos, secs_avail); | |
584 | secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, | |
585 | secs_avail); | |
a4bd217b | 586 | |
6a3abf5b HH |
587 | kfree(r_ctx); |
588 | } else { | |
589 | /* If there are no sectors in the cache, | |
590 | * flushes (bios without data) will be cleared on | |
591 | * the cache threads | |
592 | */ | |
593 | secs_avail = pblk_rb_read_count(&pblk->rwb); | |
594 | if (!secs_avail) | |
525f7bb2 | 595 | return 0; |
6a3abf5b HH |
596 | |
597 | secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb); | |
55d8ec35 | 598 | if (!secs_to_flush && secs_avail < pblk->min_write_pgs_data) |
525f7bb2 | 599 | return 0; |
6a3abf5b HH |
600 | |
601 | secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, | |
602 | secs_to_flush); | |
603 | if (secs_to_sync > pblk->max_write_pgs) { | |
4e495a46 | 604 | pblk_err(pblk, "bad buffer sync calculation\n"); |
525f7bb2 | 605 | return 0; |
6a3abf5b HH |
606 | } |
607 | ||
608 | secs_to_com = (secs_to_sync > secs_avail) ? | |
609 | secs_avail : secs_to_sync; | |
610 | pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com); | |
611 | } | |
a4bd217b | 612 | |
55d8ec35 IK |
613 | packed_meta_pgs = (pblk->min_write_pgs - pblk->min_write_pgs_data); |
614 | bio = bio_alloc(GFP_KERNEL, secs_to_sync + packed_meta_pgs); | |
875d94f3 JG |
615 | |
616 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
617 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); | |
618 | ||
e2cddf20 | 619 | rqd = pblk_alloc_rqd(pblk, PBLK_WRITE); |
875d94f3 JG |
620 | rqd->bio = bio; |
621 | ||
622 | if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync, | |
d624f371 | 623 | secs_avail)) { |
4e495a46 | 624 | pblk_err(pblk, "corrupted write bio\n"); |
a4bd217b JG |
625 | goto fail_put_bio; |
626 | } | |
627 | ||
d624f371 | 628 | if (pblk_submit_io_set(pblk, rqd)) |
a4bd217b | 629 | goto fail_free_bio; |
a4bd217b | 630 | |
880eda54 | 631 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
632 | atomic_long_add(secs_to_sync, &pblk->sub_writes); |
633 | #endif | |
634 | ||
525f7bb2 | 635 | *secs_left = 1; |
a4bd217b JG |
636 | return 0; |
637 | ||
638 | fail_free_bio: | |
d624f371 | 639 | pblk_free_write_rqd(pblk, rqd); |
a4bd217b JG |
640 | fail_put_bio: |
641 | bio_put(bio); | |
e2cddf20 | 642 | pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
a4bd217b | 643 | |
525f7bb2 | 644 | return -EINTR; |
a4bd217b JG |
645 | } |
646 | ||
647 | int pblk_write_ts(void *data) | |
648 | { | |
649 | struct pblk *pblk = data; | |
525f7bb2 HH |
650 | int secs_left; |
651 | int write_failure = 0; | |
a4bd217b JG |
652 | |
653 | while (!kthread_should_stop()) { | |
525f7bb2 HH |
654 | if (!write_failure) { |
655 | write_failure = pblk_submit_write(pblk, &secs_left); | |
656 | ||
657 | if (secs_left) | |
658 | continue; | |
659 | } | |
a4bd217b JG |
660 | set_current_state(TASK_INTERRUPTIBLE); |
661 | io_schedule(); | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } |