Commit | Line | Data |
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a4bd217b JG |
1 | /* |
2 | * Copyright (C) 2016 CNEX Labs | |
3 | * Initial release: Javier Gonzalez <javier@cnexlabs.com> | |
4 | * Matias Bjorling <matias@cnexlabs.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License version | |
8 | * 2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * pblk-write.c - pblk's write path from write buffer to media | |
16 | */ | |
17 | ||
18 | #include "pblk.h" | |
19 | ||
a4bd217b JG |
20 | static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd, |
21 | struct pblk_c_ctx *c_ctx) | |
22 | { | |
a4bd217b | 23 | struct bio *original_bio; |
533657c1 | 24 | struct pblk_rb *rwb = &pblk->rwb; |
a4bd217b JG |
25 | unsigned long ret; |
26 | int i; | |
27 | ||
28 | for (i = 0; i < c_ctx->nr_valid; i++) { | |
29 | struct pblk_w_ctx *w_ctx; | |
533657c1 HH |
30 | int pos = c_ctx->sentry + i; |
31 | int flags; | |
32 | ||
33 | w_ctx = pblk_rb_w_ctx(rwb, pos); | |
34 | flags = READ_ONCE(w_ctx->flags); | |
35 | ||
36 | if (flags & PBLK_FLUSH_ENTRY) { | |
37 | flags &= ~PBLK_FLUSH_ENTRY; | |
38 | /* Release flags on context. Protect from writes */ | |
39 | smp_store_release(&w_ctx->flags, flags); | |
40 | ||
880eda54 | 41 | #ifdef CONFIG_NVM_PBLK_DEBUG |
533657c1 HH |
42 | atomic_dec(&rwb->inflight_flush_point); |
43 | #endif | |
44 | } | |
a4bd217b | 45 | |
a4bd217b JG |
46 | while ((original_bio = bio_list_pop(&w_ctx->bios))) |
47 | bio_endio(original_bio); | |
48 | } | |
49 | ||
cd8ddbf7 JG |
50 | if (c_ctx->nr_padded) |
51 | pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, | |
52 | c_ctx->nr_padded); | |
53 | ||
880eda54 | 54 | #ifdef CONFIG_NVM_PBLK_DEBUG |
e0e12a70 | 55 | atomic_long_add(rqd->nr_ppas, &pblk->sync_writes); |
a4bd217b JG |
56 | #endif |
57 | ||
58 | ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid); | |
59 | ||
a4bd217b | 60 | bio_put(rqd->bio); |
e2cddf20 | 61 | pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
a4bd217b JG |
62 | |
63 | return ret; | |
64 | } | |
65 | ||
66 | static unsigned long pblk_end_queued_w_bio(struct pblk *pblk, | |
67 | struct nvm_rq *rqd, | |
68 | struct pblk_c_ctx *c_ctx) | |
69 | { | |
70 | list_del(&c_ctx->list); | |
71 | return pblk_end_w_bio(pblk, rqd, c_ctx); | |
72 | } | |
73 | ||
74 | static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd, | |
75 | struct pblk_c_ctx *c_ctx) | |
76 | { | |
77 | struct pblk_c_ctx *c, *r; | |
78 | unsigned long flags; | |
79 | unsigned long pos; | |
80 | ||
880eda54 | 81 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
82 | atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes); |
83 | #endif | |
e99e802f | 84 | pblk_up_rq(pblk, c_ctx->lun_bitmap); |
a4bd217b JG |
85 | |
86 | pos = pblk_rb_sync_init(&pblk->rwb, &flags); | |
87 | if (pos == c_ctx->sentry) { | |
88 | pos = pblk_end_w_bio(pblk, rqd, c_ctx); | |
89 | ||
90 | retry: | |
91 | list_for_each_entry_safe(c, r, &pblk->compl_list, list) { | |
92 | rqd = nvm_rq_from_c_ctx(c); | |
93 | if (c->sentry == pos) { | |
94 | pos = pblk_end_queued_w_bio(pblk, rqd, c); | |
95 | goto retry; | |
96 | } | |
97 | } | |
98 | } else { | |
99 | WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd); | |
100 | list_add_tail(&c_ctx->list, &pblk->compl_list); | |
101 | } | |
102 | pblk_rb_sync_end(&pblk->rwb, &flags); | |
103 | } | |
104 | ||
6a3abf5b HH |
105 | /* Map remaining sectors in chunk, starting from ppa */ |
106 | static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa) | |
a4bd217b | 107 | { |
6a3abf5b HH |
108 | struct nvm_tgt_dev *dev = pblk->dev; |
109 | struct nvm_geo *geo = &dev->geo; | |
110 | struct pblk_line *line; | |
111 | struct ppa_addr map_ppa = *ppa; | |
112 | u64 paddr; | |
113 | int done = 0; | |
a4bd217b | 114 | |
cb21665c | 115 | line = pblk_ppa_to_line(pblk, *ppa); |
6a3abf5b | 116 | spin_lock(&line->lock); |
a4bd217b | 117 | |
6a3abf5b HH |
118 | while (!done) { |
119 | paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa); | |
2942f50f | 120 | |
6a3abf5b HH |
121 | if (!test_and_set_bit(paddr, line->map_bitmap)) |
122 | line->left_msecs--; | |
a4bd217b | 123 | |
6a3abf5b HH |
124 | if (!test_and_set_bit(paddr, line->invalid_bitmap)) |
125 | le32_add_cpu(line->vsc, -1); | |
a4bd217b | 126 | |
6a3abf5b HH |
127 | if (geo->version == NVM_OCSSD_SPEC_12) { |
128 | map_ppa.ppa++; | |
129 | if (map_ppa.g.pg == geo->num_pg) | |
130 | done = 1; | |
131 | } else { | |
132 | map_ppa.m.sec++; | |
133 | if (map_ppa.m.sec == geo->clba) | |
134 | done = 1; | |
a4bd217b | 135 | } |
6a3abf5b | 136 | } |
a4bd217b | 137 | |
48b8d208 | 138 | line->w_err_gc->has_write_err = 1; |
6a3abf5b HH |
139 | spin_unlock(&line->lock); |
140 | } | |
141 | ||
142 | static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry, | |
143 | unsigned int nr_entries) | |
144 | { | |
145 | struct pblk_rb *rb = &pblk->rwb; | |
146 | struct pblk_rb_entry *entry; | |
147 | struct pblk_line *line; | |
148 | struct pblk_w_ctx *w_ctx; | |
149 | struct ppa_addr ppa_l2p; | |
150 | int flags; | |
151 | unsigned int pos, i; | |
152 | ||
153 | spin_lock(&pblk->trans_lock); | |
154 | pos = sentry; | |
155 | for (i = 0; i < nr_entries; i++) { | |
156 | entry = &rb->entries[pos]; | |
157 | w_ctx = &entry->w_ctx; | |
158 | ||
159 | /* Check if the lba has been overwritten */ | |
160 | ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba); | |
161 | if (!pblk_ppa_comp(ppa_l2p, entry->cacheline)) | |
162 | w_ctx->lba = ADDR_EMPTY; | |
163 | ||
164 | /* Mark up the entry as submittable again */ | |
165 | flags = READ_ONCE(w_ctx->flags); | |
166 | flags |= PBLK_WRITTEN_DATA; | |
167 | /* Release flags on write context. Protect from writes */ | |
168 | smp_store_release(&w_ctx->flags, flags); | |
a4bd217b | 169 | |
2e696f90 | 170 | /* Decrease the reference count to the line as we will |
6a3abf5b | 171 | * re-map these entries |
a4bd217b | 172 | */ |
cb21665c | 173 | line = pblk_ppa_to_line(pblk, w_ctx->ppa); |
6a3abf5b HH |
174 | kref_put(&line->ref, pblk_line_put); |
175 | ||
176 | pos = (pos + 1) & (rb->nr_entries - 1); | |
a4bd217b | 177 | } |
6a3abf5b HH |
178 | spin_unlock(&pblk->trans_lock); |
179 | } | |
a4bd217b | 180 | |
6a3abf5b HH |
181 | static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx) |
182 | { | |
183 | struct pblk_c_ctx *r_ctx; | |
184 | ||
185 | r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL); | |
186 | if (!r_ctx) | |
187 | return; | |
188 | ||
189 | r_ctx->lun_bitmap = NULL; | |
190 | r_ctx->sentry = c_ctx->sentry; | |
191 | r_ctx->nr_valid = c_ctx->nr_valid; | |
192 | r_ctx->nr_padded = c_ctx->nr_padded; | |
193 | ||
194 | spin_lock(&pblk->resubmit_lock); | |
195 | list_add_tail(&r_ctx->list, &pblk->resubmit_list); | |
196 | spin_unlock(&pblk->resubmit_lock); | |
197 | ||
880eda54 | 198 | #ifdef CONFIG_NVM_PBLK_DEBUG |
6a3abf5b HH |
199 | atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes); |
200 | #endif | |
201 | } | |
202 | ||
203 | static void pblk_submit_rec(struct work_struct *work) | |
204 | { | |
205 | struct pblk_rec_ctx *recovery = | |
206 | container_of(work, struct pblk_rec_ctx, ws_rec); | |
207 | struct pblk *pblk = recovery->pblk; | |
208 | struct nvm_rq *rqd = recovery->rqd; | |
209 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
d68a9344 | 210 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
6a3abf5b HH |
211 | |
212 | pblk_log_write_err(pblk, rqd); | |
213 | ||
6a3abf5b HH |
214 | pblk_map_remaining(pblk, ppa_list); |
215 | pblk_queue_resubmit(pblk, c_ctx); | |
216 | ||
e99e802f | 217 | pblk_up_rq(pblk, c_ctx->lun_bitmap); |
6a3abf5b HH |
218 | if (c_ctx->nr_padded) |
219 | pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, | |
220 | c_ctx->nr_padded); | |
221 | bio_put(rqd->bio); | |
222 | pblk_free_rqd(pblk, rqd, PBLK_WRITE); | |
223 | mempool_free(recovery, &pblk->rec_pool); | |
224 | ||
225 | atomic_dec(&pblk->inflight_io); | |
226 | } | |
227 | ||
228 | ||
229 | static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd) | |
230 | { | |
231 | struct pblk_rec_ctx *recovery; | |
232 | ||
233 | recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC); | |
234 | if (!recovery) { | |
4e495a46 | 235 | pblk_err(pblk, "could not allocate recovery work\n"); |
6a3abf5b | 236 | return; |
a4bd217b JG |
237 | } |
238 | ||
6a3abf5b HH |
239 | recovery->pblk = pblk; |
240 | recovery->rqd = rqd; | |
241 | ||
a4bd217b | 242 | INIT_WORK(&recovery->ws_rec, pblk_submit_rec); |
ef576494 | 243 | queue_work(pblk->close_wq, &recovery->ws_rec); |
a4bd217b JG |
244 | } |
245 | ||
246 | static void pblk_end_io_write(struct nvm_rq *rqd) | |
247 | { | |
248 | struct pblk *pblk = rqd->private; | |
249 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
250 | ||
251 | if (rqd->error) { | |
6a3abf5b HH |
252 | pblk_end_w_fail(pblk, rqd); |
253 | return; | |
a4bd217b | 254 | } |
880eda54 | 255 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b | 256 | else |
4e4cbee9 | 257 | WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n"); |
a4bd217b JG |
258 | #endif |
259 | ||
260 | pblk_complete_write(pblk, rqd, c_ctx); | |
588726d3 | 261 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
262 | } |
263 | ||
dd2a4343 JG |
264 | static void pblk_end_io_write_meta(struct nvm_rq *rqd) |
265 | { | |
266 | struct pblk *pblk = rqd->private; | |
dd2a4343 JG |
267 | struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd); |
268 | struct pblk_line *line = m_ctx->private; | |
269 | struct pblk_emeta *emeta = line->emeta; | |
d68a9344 | 270 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
dd2a4343 JG |
271 | int sync; |
272 | ||
d68a9344 | 273 | pblk_up_page(pblk, ppa_list, rqd->nr_ppas); |
dd2a4343 JG |
274 | |
275 | if (rqd->error) { | |
276 | pblk_log_write_err(pblk, rqd); | |
4e495a46 | 277 | pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id); |
48b8d208 | 278 | line->w_err_gc->has_write_err = 1; |
dd2a4343 | 279 | } |
dd2a4343 JG |
280 | |
281 | sync = atomic_add_return(rqd->nr_ppas, &emeta->sync); | |
282 | if (sync == emeta->nr_entries) | |
b84ae4a8 JG |
283 | pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws, |
284 | GFP_ATOMIC, pblk->close_wq); | |
dd2a4343 | 285 | |
e2cddf20 | 286 | pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); |
588726d3 JG |
287 | |
288 | atomic_dec(&pblk->inflight_io); | |
dd2a4343 JG |
289 | } |
290 | ||
a4bd217b | 291 | static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd, |
dd2a4343 JG |
292 | unsigned int nr_secs, |
293 | nvm_end_io_fn(*end_io)) | |
a4bd217b JG |
294 | { |
295 | struct nvm_tgt_dev *dev = pblk->dev; | |
296 | ||
297 | /* Setup write request */ | |
298 | rqd->opcode = NVM_OP_PWRITE; | |
299 | rqd->nr_ppas = nr_secs; | |
d7b68016 | 300 | rqd->is_seq = 1; |
a4bd217b | 301 | rqd->private = pblk; |
dd2a4343 | 302 | rqd->end_io = end_io; |
a4bd217b JG |
303 | |
304 | rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, | |
305 | &rqd->dma_meta_list); | |
306 | if (!rqd->meta_list) | |
307 | return -ENOMEM; | |
308 | ||
a4bd217b JG |
309 | rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size; |
310 | rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size; | |
311 | ||
312 | return 0; | |
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))) |
a4bd217b JG |
339 | pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, valid, 0); |
340 | else | |
341 | pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, | |
d624f371 | 342 | valid, erase_ppa); |
a4bd217b | 343 | |
d624f371 | 344 | return 0; |
a4bd217b JG |
345 | } |
346 | ||
a4bd217b JG |
347 | static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail, |
348 | unsigned int secs_to_flush) | |
349 | { | |
350 | int secs_to_sync; | |
351 | ||
352 | secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush); | |
353 | ||
880eda54 | 354 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
355 | if ((!secs_to_sync && secs_to_flush) |
356 | || (secs_to_sync < 0) | |
357 | || (secs_to_sync > secs_avail && !secs_to_flush)) { | |
4e495a46 | 358 | pblk_err(pblk, "bad sector calculation (a:%d,s:%d,f:%d)\n", |
a4bd217b JG |
359 | secs_avail, secs_to_sync, secs_to_flush); |
360 | } | |
361 | #endif | |
362 | ||
363 | return secs_to_sync; | |
364 | } | |
365 | ||
dd2a4343 JG |
366 | int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) |
367 | { | |
368 | struct nvm_tgt_dev *dev = pblk->dev; | |
369 | struct nvm_geo *geo = &dev->geo; | |
370 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
371 | struct pblk_line_meta *lm = &pblk->lm; | |
372 | struct pblk_emeta *emeta = meta_line->emeta; | |
d68a9344 | 373 | struct ppa_addr *ppa_list; |
dd2a4343 | 374 | struct pblk_g_ctx *m_ctx; |
dd2a4343 JG |
375 | struct bio *bio; |
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 | ||
de54e703 JG |
393 | bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len, |
394 | l_mg->emeta_alloc_type, GFP_KERNEL); | |
dd2a4343 | 395 | if (IS_ERR(bio)) { |
4e495a46 | 396 | pblk_err(pblk, "failed to map emeta io"); |
dd2a4343 JG |
397 | ret = PTR_ERR(bio); |
398 | goto fail_free_rqd; | |
399 | } | |
400 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
401 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); | |
402 | rqd->bio = bio; | |
403 | ||
404 | ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta); | |
405 | if (ret) | |
406 | goto fail_free_bio; | |
407 | ||
d68a9344 | 408 | ppa_list = nvm_rq_to_ppa_list(rqd); |
dd2a4343 JG |
409 | for (i = 0; i < rqd->nr_ppas; ) { |
410 | spin_lock(&meta_line->lock); | |
411 | paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas); | |
412 | spin_unlock(&meta_line->lock); | |
413 | for (j = 0; j < rq_ppas; j++, i++, paddr++) | |
d68a9344 | 414 | ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id); |
dd2a4343 JG |
415 | } |
416 | ||
d8adaa3b | 417 | spin_lock(&l_mg->close_lock); |
dd2a4343 | 418 | emeta->mem += rq_len; |
d8adaa3b | 419 | if (emeta->mem >= lm->emeta_len[0]) |
dd2a4343 | 420 | list_del(&meta_line->list); |
d8adaa3b | 421 | spin_unlock(&l_mg->close_lock); |
dd2a4343 | 422 | |
d68a9344 | 423 | pblk_down_page(pblk, ppa_list, rqd->nr_ppas); |
3eaa11e2 | 424 | |
dd2a4343 JG |
425 | ret = pblk_submit_io(pblk, rqd); |
426 | if (ret) { | |
4e495a46 | 427 | pblk_err(pblk, "emeta I/O submission failed: %d\n", ret); |
dd2a4343 JG |
428 | goto fail_rollback; |
429 | } | |
430 | ||
431 | return NVM_IO_OK; | |
432 | ||
433 | fail_rollback: | |
d68a9344 | 434 | pblk_up_page(pblk, ppa_list, rqd->nr_ppas); |
dd2a4343 JG |
435 | spin_lock(&l_mg->close_lock); |
436 | pblk_dealloc_page(pblk, meta_line, rq_ppas); | |
437 | list_add(&meta_line->list, &meta_line->list); | |
438 | spin_unlock(&l_mg->close_lock); | |
439 | fail_free_bio: | |
55e836d4 | 440 | bio_put(bio); |
dd2a4343 | 441 | fail_free_rqd: |
e2cddf20 | 442 | pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); |
dd2a4343 JG |
443 | return ret; |
444 | } | |
445 | ||
1e82123d JG |
446 | static inline bool pblk_valid_meta_ppa(struct pblk *pblk, |
447 | struct pblk_line *meta_line, | |
448 | struct nvm_rq *data_rqd) | |
449 | { | |
450 | struct nvm_tgt_dev *dev = pblk->dev; | |
451 | struct nvm_geo *geo = &dev->geo; | |
452 | struct pblk_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd); | |
453 | struct pblk_line *data_line = pblk_line_get_data(pblk); | |
454 | struct ppa_addr ppa, ppa_opt; | |
455 | u64 paddr; | |
456 | int pos_opt; | |
457 | ||
458 | /* Schedule a metadata I/O that is half the distance from the data I/O | |
459 | * with regards to the number of LUNs forming the pblk instance. This | |
460 | * balances LUN conflicts across every I/O. | |
461 | * | |
462 | * When the LUN configuration changes (e.g., due to GC), this distance | |
463 | * can align, which would result on metadata and data I/Os colliding. In | |
464 | * this case, modify the distance to not be optimal, but move the | |
465 | * optimal in the right direction. | |
466 | */ | |
467 | paddr = pblk_lookup_page(pblk, meta_line); | |
468 | ppa = addr_to_gen_ppa(pblk, paddr, 0); | |
469 | ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0); | |
470 | pos_opt = pblk_ppa_to_pos(geo, ppa_opt); | |
471 | ||
472 | if (test_bit(pos_opt, data_c_ctx->lun_bitmap) || | |
473 | test_bit(pos_opt, data_line->blk_bitmap)) | |
474 | return true; | |
475 | ||
476 | if (unlikely(pblk_ppa_comp(ppa_opt, ppa))) | |
477 | data_line->meta_distance--; | |
478 | ||
479 | return false; | |
480 | } | |
481 | ||
482 | static struct pblk_line *pblk_should_submit_meta_io(struct pblk *pblk, | |
483 | struct nvm_rq *data_rqd) | |
dd2a4343 JG |
484 | { |
485 | struct pblk_line_meta *lm = &pblk->lm; | |
486 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
487 | struct pblk_line *meta_line; | |
488 | ||
489 | spin_lock(&l_mg->close_lock); | |
dd2a4343 JG |
490 | if (list_empty(&l_mg->emeta_list)) { |
491 | spin_unlock(&l_mg->close_lock); | |
1e82123d | 492 | return NULL; |
dd2a4343 JG |
493 | } |
494 | meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list); | |
d8adaa3b JG |
495 | if (meta_line->emeta->mem >= lm->emeta_len[0]) { |
496 | spin_unlock(&l_mg->close_lock); | |
497 | return NULL; | |
498 | } | |
dd2a4343 JG |
499 | spin_unlock(&l_mg->close_lock); |
500 | ||
1e82123d JG |
501 | if (!pblk_valid_meta_ppa(pblk, meta_line, data_rqd)) |
502 | return NULL; | |
dd2a4343 | 503 | |
1e82123d | 504 | return meta_line; |
dd2a4343 JG |
505 | } |
506 | ||
d624f371 JG |
507 | static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd) |
508 | { | |
d624f371 | 509 | struct ppa_addr erase_ppa; |
1e82123d | 510 | struct pblk_line *meta_line; |
d624f371 JG |
511 | int err; |
512 | ||
26f76dce | 513 | pblk_ppa_set_empty(&erase_ppa); |
d624f371 JG |
514 | |
515 | /* Assign lbas to ppas and populate request structure */ | |
1e82123d | 516 | err = pblk_setup_w_rq(pblk, rqd, &erase_ppa); |
d624f371 | 517 | if (err) { |
4e495a46 | 518 | pblk_err(pblk, "could not setup write request: %d\n", err); |
d624f371 JG |
519 | return NVM_IO_ERR; |
520 | } | |
521 | ||
1e82123d | 522 | meta_line = pblk_should_submit_meta_io(pblk, rqd); |
dd2a4343 | 523 | |
1e82123d JG |
524 | /* Submit data write for current data line */ |
525 | err = pblk_submit_io(pblk, rqd); | |
526 | if (err) { | |
4e495a46 | 527 | pblk_err(pblk, "data I/O submission failed: %d\n", err); |
1e82123d JG |
528 | return NVM_IO_ERR; |
529 | } | |
d624f371 | 530 | |
26f76dce | 531 | if (!pblk_ppa_empty(erase_ppa)) { |
1e82123d | 532 | /* Submit erase for next data line */ |
dd2a4343 JG |
533 | if (pblk_blk_erase_async(pblk, erase_ppa)) { |
534 | struct pblk_line *e_line = pblk_line_get_erase(pblk); | |
535 | struct nvm_tgt_dev *dev = pblk->dev; | |
536 | struct nvm_geo *geo = &dev->geo; | |
537 | int bit; | |
538 | ||
539 | atomic_inc(&e_line->left_eblks); | |
540 | bit = pblk_ppa_to_pos(geo, erase_ppa); | |
541 | WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap)); | |
542 | } | |
d624f371 JG |
543 | } |
544 | ||
1e82123d JG |
545 | if (meta_line) { |
546 | /* Submit metadata write for previous data line */ | |
547 | err = pblk_submit_meta_io(pblk, meta_line); | |
548 | if (err) { | |
4e495a46 MB |
549 | pblk_err(pblk, "metadata I/O submission failed: %d", |
550 | err); | |
1e82123d JG |
551 | return NVM_IO_ERR; |
552 | } | |
553 | } | |
554 | ||
d624f371 JG |
555 | return NVM_IO_OK; |
556 | } | |
557 | ||
558 | static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd) | |
559 | { | |
560 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
561 | struct bio *bio = rqd->bio; | |
562 | ||
563 | if (c_ctx->nr_padded) | |
cd8ddbf7 JG |
564 | pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid, |
565 | c_ctx->nr_padded); | |
d624f371 JG |
566 | } |
567 | ||
a4bd217b JG |
568 | static int pblk_submit_write(struct pblk *pblk) |
569 | { | |
570 | struct bio *bio; | |
571 | struct nvm_rq *rqd; | |
a4bd217b JG |
572 | unsigned int secs_avail, secs_to_sync, secs_to_com; |
573 | unsigned int secs_to_flush; | |
574 | unsigned long pos; | |
6a3abf5b | 575 | unsigned int resubmit; |
a4bd217b | 576 | |
6a3abf5b HH |
577 | spin_lock(&pblk->resubmit_lock); |
578 | resubmit = !list_empty(&pblk->resubmit_list); | |
579 | spin_unlock(&pblk->resubmit_lock); | |
580 | ||
581 | /* Resubmit failed writes first */ | |
582 | if (resubmit) { | |
583 | struct pblk_c_ctx *r_ctx; | |
584 | ||
585 | spin_lock(&pblk->resubmit_lock); | |
586 | r_ctx = list_first_entry(&pblk->resubmit_list, | |
587 | struct pblk_c_ctx, list); | |
588 | list_del(&r_ctx->list); | |
589 | spin_unlock(&pblk->resubmit_lock); | |
590 | ||
591 | secs_avail = r_ctx->nr_valid; | |
592 | pos = r_ctx->sentry; | |
593 | ||
594 | pblk_prepare_resubmit(pblk, pos, secs_avail); | |
595 | secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, | |
596 | secs_avail); | |
a4bd217b | 597 | |
6a3abf5b HH |
598 | kfree(r_ctx); |
599 | } else { | |
600 | /* If there are no sectors in the cache, | |
601 | * flushes (bios without data) will be cleared on | |
602 | * the cache threads | |
603 | */ | |
604 | secs_avail = pblk_rb_read_count(&pblk->rwb); | |
605 | if (!secs_avail) | |
606 | return 1; | |
607 | ||
608 | secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb); | |
609 | if (!secs_to_flush && secs_avail < pblk->min_write_pgs) | |
610 | return 1; | |
611 | ||
612 | secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, | |
613 | secs_to_flush); | |
614 | if (secs_to_sync > pblk->max_write_pgs) { | |
4e495a46 | 615 | pblk_err(pblk, "bad buffer sync calculation\n"); |
6a3abf5b HH |
616 | return 1; |
617 | } | |
618 | ||
619 | secs_to_com = (secs_to_sync > secs_avail) ? | |
620 | secs_avail : secs_to_sync; | |
621 | pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com); | |
622 | } | |
a4bd217b | 623 | |
875d94f3 JG |
624 | bio = bio_alloc(GFP_KERNEL, secs_to_sync); |
625 | ||
626 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
627 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); | |
628 | ||
e2cddf20 | 629 | rqd = pblk_alloc_rqd(pblk, PBLK_WRITE); |
875d94f3 JG |
630 | rqd->bio = bio; |
631 | ||
632 | if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync, | |
d624f371 | 633 | secs_avail)) { |
4e495a46 | 634 | pblk_err(pblk, "corrupted write bio\n"); |
a4bd217b JG |
635 | goto fail_put_bio; |
636 | } | |
637 | ||
d624f371 | 638 | if (pblk_submit_io_set(pblk, rqd)) |
a4bd217b | 639 | goto fail_free_bio; |
a4bd217b | 640 | |
880eda54 | 641 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
642 | atomic_long_add(secs_to_sync, &pblk->sub_writes); |
643 | #endif | |
644 | ||
645 | return 0; | |
646 | ||
647 | fail_free_bio: | |
d624f371 | 648 | pblk_free_write_rqd(pblk, rqd); |
a4bd217b JG |
649 | fail_put_bio: |
650 | bio_put(bio); | |
e2cddf20 | 651 | pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
a4bd217b JG |
652 | |
653 | return 1; | |
654 | } | |
655 | ||
656 | int pblk_write_ts(void *data) | |
657 | { | |
658 | struct pblk *pblk = data; | |
659 | ||
660 | while (!kthread_should_stop()) { | |
661 | if (!pblk_submit_write(pblk)) | |
662 | continue; | |
663 | set_current_state(TASK_INTERRUPTIBLE); | |
664 | io_schedule(); | |
665 | } | |
666 | ||
667 | return 0; | |
668 | } |