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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 | { | |
23 | struct nvm_tgt_dev *dev = pblk->dev; | |
24 | struct bio *original_bio; | |
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; | |
a4bd217b JG |
30 | |
31 | w_ctx = pblk_rb_w_ctx(&pblk->rwb, c_ctx->sentry + i); | |
a4bd217b JG |
32 | while ((original_bio = bio_list_pop(&w_ctx->bios))) |
33 | bio_endio(original_bio); | |
34 | } | |
35 | ||
36 | #ifdef CONFIG_NVM_DEBUG | |
0880a9aa | 37 | atomic_long_add(c_ctx->nr_valid, &pblk->sync_writes); |
a4bd217b JG |
38 | #endif |
39 | ||
40 | ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid); | |
41 | ||
42 | if (rqd->meta_list) | |
43 | nvm_dev_dma_free(dev->parent, rqd->meta_list, | |
44 | rqd->dma_meta_list); | |
45 | ||
46 | bio_put(rqd->bio); | |
47 | pblk_free_rqd(pblk, rqd, WRITE); | |
48 | ||
49 | return ret; | |
50 | } | |
51 | ||
52 | static unsigned long pblk_end_queued_w_bio(struct pblk *pblk, | |
53 | struct nvm_rq *rqd, | |
54 | struct pblk_c_ctx *c_ctx) | |
55 | { | |
56 | list_del(&c_ctx->list); | |
57 | return pblk_end_w_bio(pblk, rqd, c_ctx); | |
58 | } | |
59 | ||
60 | static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd, | |
61 | struct pblk_c_ctx *c_ctx) | |
62 | { | |
63 | struct pblk_c_ctx *c, *r; | |
64 | unsigned long flags; | |
65 | unsigned long pos; | |
66 | ||
67 | #ifdef CONFIG_NVM_DEBUG | |
68 | atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes); | |
69 | #endif | |
70 | ||
71 | pblk_up_rq(pblk, rqd->ppa_list, rqd->nr_ppas, c_ctx->lun_bitmap); | |
72 | ||
73 | pos = pblk_rb_sync_init(&pblk->rwb, &flags); | |
74 | if (pos == c_ctx->sentry) { | |
75 | pos = pblk_end_w_bio(pblk, rqd, c_ctx); | |
76 | ||
77 | retry: | |
78 | list_for_each_entry_safe(c, r, &pblk->compl_list, list) { | |
79 | rqd = nvm_rq_from_c_ctx(c); | |
80 | if (c->sentry == pos) { | |
81 | pos = pblk_end_queued_w_bio(pblk, rqd, c); | |
82 | goto retry; | |
83 | } | |
84 | } | |
85 | } else { | |
86 | WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd); | |
87 | list_add_tail(&c_ctx->list, &pblk->compl_list); | |
88 | } | |
89 | pblk_rb_sync_end(&pblk->rwb, &flags); | |
90 | } | |
91 | ||
92 | /* When a write fails, we are not sure whether the block has grown bad or a page | |
93 | * range is more susceptible to write errors. If a high number of pages fail, we | |
94 | * assume that the block is bad and we mark it accordingly. In all cases, we | |
95 | * remap and resubmit the failed entries as fast as possible; if a flush is | |
96 | * waiting on a completion, the whole stack would stall otherwise. | |
97 | */ | |
98 | static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd) | |
99 | { | |
100 | void *comp_bits = &rqd->ppa_status; | |
101 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
102 | struct pblk_rec_ctx *recovery; | |
103 | struct ppa_addr *ppa_list = rqd->ppa_list; | |
104 | int nr_ppas = rqd->nr_ppas; | |
105 | unsigned int c_entries; | |
106 | int bit, ret; | |
107 | ||
108 | if (unlikely(nr_ppas == 1)) | |
109 | ppa_list = &rqd->ppa_addr; | |
110 | ||
111 | recovery = mempool_alloc(pblk->rec_pool, GFP_ATOMIC); | |
112 | if (!recovery) { | |
113 | pr_err("pblk: could not allocate recovery context\n"); | |
114 | return; | |
115 | } | |
116 | INIT_LIST_HEAD(&recovery->failed); | |
117 | ||
118 | bit = -1; | |
119 | while ((bit = find_next_bit(comp_bits, nr_ppas, bit + 1)) < nr_ppas) { | |
120 | struct pblk_rb_entry *entry; | |
121 | struct ppa_addr ppa; | |
122 | ||
123 | /* Logic error */ | |
124 | if (bit > c_ctx->nr_valid) { | |
2a79efd8 | 125 | WARN_ONCE(1, "pblk: corrupted write request\n"); |
33db9fd4 | 126 | mempool_free(recovery, pblk->rec_pool); |
a4bd217b JG |
127 | goto out; |
128 | } | |
129 | ||
130 | ppa = ppa_list[bit]; | |
131 | entry = pblk_rb_sync_scan_entry(&pblk->rwb, &ppa); | |
132 | if (!entry) { | |
133 | pr_err("pblk: could not scan entry on write failure\n"); | |
33db9fd4 | 134 | mempool_free(recovery, pblk->rec_pool); |
a4bd217b JG |
135 | goto out; |
136 | } | |
137 | ||
138 | /* The list is filled first and emptied afterwards. No need for | |
139 | * protecting it with a lock | |
140 | */ | |
141 | list_add_tail(&entry->index, &recovery->failed); | |
142 | } | |
143 | ||
144 | c_entries = find_first_bit(comp_bits, nr_ppas); | |
145 | ret = pblk_recov_setup_rq(pblk, c_ctx, recovery, comp_bits, c_entries); | |
146 | if (ret) { | |
147 | pr_err("pblk: could not recover from write failure\n"); | |
33db9fd4 | 148 | mempool_free(recovery, pblk->rec_pool); |
a4bd217b JG |
149 | goto out; |
150 | } | |
151 | ||
152 | INIT_WORK(&recovery->ws_rec, pblk_submit_rec); | |
ef576494 | 153 | queue_work(pblk->close_wq, &recovery->ws_rec); |
a4bd217b JG |
154 | |
155 | out: | |
156 | pblk_complete_write(pblk, rqd, c_ctx); | |
157 | } | |
158 | ||
159 | static void pblk_end_io_write(struct nvm_rq *rqd) | |
160 | { | |
161 | struct pblk *pblk = rqd->private; | |
162 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
163 | ||
164 | if (rqd->error) { | |
165 | pblk_log_write_err(pblk, rqd); | |
166 | return pblk_end_w_fail(pblk, rqd); | |
167 | } | |
168 | #ifdef CONFIG_NVM_DEBUG | |
169 | else | |
4e4cbee9 | 170 | WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n"); |
a4bd217b JG |
171 | #endif |
172 | ||
173 | pblk_complete_write(pblk, rqd, c_ctx); | |
588726d3 | 174 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
175 | } |
176 | ||
dd2a4343 JG |
177 | static void pblk_end_io_write_meta(struct nvm_rq *rqd) |
178 | { | |
179 | struct pblk *pblk = rqd->private; | |
180 | struct nvm_tgt_dev *dev = pblk->dev; | |
181 | struct nvm_geo *geo = &dev->geo; | |
182 | struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd); | |
183 | struct pblk_line *line = m_ctx->private; | |
184 | struct pblk_emeta *emeta = line->emeta; | |
185 | int pos = pblk_ppa_to_pos(geo, rqd->ppa_list[0]); | |
186 | struct pblk_lun *rlun = &pblk->luns[pos]; | |
187 | int sync; | |
188 | ||
189 | up(&rlun->wr_sem); | |
190 | ||
191 | if (rqd->error) { | |
192 | pblk_log_write_err(pblk, rqd); | |
193 | pr_err("pblk: metadata I/O failed\n"); | |
194 | } | |
195 | #ifdef CONFIG_NVM_DEBUG | |
196 | else | |
197 | WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n"); | |
198 | #endif | |
199 | ||
200 | sync = atomic_add_return(rqd->nr_ppas, &emeta->sync); | |
201 | if (sync == emeta->nr_entries) | |
ef576494 JG |
202 | pblk_line_run_ws(pblk, line, NULL, pblk_line_close_ws, |
203 | pblk->close_wq); | |
dd2a4343 JG |
204 | |
205 | bio_put(rqd->bio); | |
206 | pblk_free_rqd(pblk, rqd, READ); | |
588726d3 JG |
207 | |
208 | atomic_dec(&pblk->inflight_io); | |
dd2a4343 JG |
209 | } |
210 | ||
a4bd217b | 211 | static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd, |
dd2a4343 JG |
212 | unsigned int nr_secs, |
213 | nvm_end_io_fn(*end_io)) | |
a4bd217b JG |
214 | { |
215 | struct nvm_tgt_dev *dev = pblk->dev; | |
216 | ||
217 | /* Setup write request */ | |
218 | rqd->opcode = NVM_OP_PWRITE; | |
219 | rqd->nr_ppas = nr_secs; | |
220 | rqd->flags = pblk_set_progr_mode(pblk, WRITE); | |
221 | rqd->private = pblk; | |
dd2a4343 | 222 | rqd->end_io = end_io; |
a4bd217b JG |
223 | |
224 | rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, | |
225 | &rqd->dma_meta_list); | |
226 | if (!rqd->meta_list) | |
227 | return -ENOMEM; | |
228 | ||
229 | if (unlikely(nr_secs == 1)) | |
230 | return 0; | |
231 | ||
232 | rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size; | |
233 | rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
d624f371 | 239 | struct pblk_c_ctx *c_ctx, struct ppa_addr *erase_ppa) |
a4bd217b JG |
240 | { |
241 | struct pblk_line_meta *lm = &pblk->lm; | |
d624f371 | 242 | struct pblk_line *e_line = pblk_line_get_erase(pblk); |
a4bd217b JG |
243 | unsigned int valid = c_ctx->nr_valid; |
244 | unsigned int padded = c_ctx->nr_padded; | |
245 | unsigned int nr_secs = valid + padded; | |
246 | unsigned long *lun_bitmap; | |
247 | int ret = 0; | |
248 | ||
249 | lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL); | |
d624f371 JG |
250 | if (!lun_bitmap) |
251 | return -ENOMEM; | |
a4bd217b JG |
252 | c_ctx->lun_bitmap = lun_bitmap; |
253 | ||
dd2a4343 | 254 | ret = pblk_alloc_w_rq(pblk, rqd, nr_secs, pblk_end_io_write); |
a4bd217b JG |
255 | if (ret) { |
256 | kfree(lun_bitmap); | |
d624f371 | 257 | return ret; |
a4bd217b JG |
258 | } |
259 | ||
588726d3 | 260 | if (likely(!e_line || !atomic_read(&e_line->left_eblks))) |
a4bd217b JG |
261 | pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, valid, 0); |
262 | else | |
263 | pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, | |
d624f371 | 264 | valid, erase_ppa); |
a4bd217b | 265 | |
d624f371 | 266 | return 0; |
a4bd217b JG |
267 | } |
268 | ||
269 | int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
270 | struct pblk_c_ctx *c_ctx) | |
271 | { | |
272 | struct pblk_line_meta *lm = &pblk->lm; | |
273 | unsigned long *lun_bitmap; | |
274 | int ret; | |
275 | ||
276 | lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL); | |
277 | if (!lun_bitmap) | |
278 | return -ENOMEM; | |
279 | ||
280 | c_ctx->lun_bitmap = lun_bitmap; | |
281 | ||
dd2a4343 | 282 | ret = pblk_alloc_w_rq(pblk, rqd, rqd->nr_ppas, pblk_end_io_write); |
a4bd217b JG |
283 | if (ret) |
284 | return ret; | |
285 | ||
286 | pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, c_ctx->nr_valid, 0); | |
287 | ||
288 | rqd->ppa_status = (u64)0; | |
289 | rqd->flags = pblk_set_progr_mode(pblk, WRITE); | |
290 | ||
291 | return ret; | |
292 | } | |
293 | ||
294 | static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail, | |
295 | unsigned int secs_to_flush) | |
296 | { | |
297 | int secs_to_sync; | |
298 | ||
299 | secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush); | |
300 | ||
301 | #ifdef CONFIG_NVM_DEBUG | |
302 | if ((!secs_to_sync && secs_to_flush) | |
303 | || (secs_to_sync < 0) | |
304 | || (secs_to_sync > secs_avail && !secs_to_flush)) { | |
305 | pr_err("pblk: bad sector calculation (a:%d,s:%d,f:%d)\n", | |
306 | secs_avail, secs_to_sync, secs_to_flush); | |
307 | } | |
308 | #endif | |
309 | ||
310 | return secs_to_sync; | |
311 | } | |
312 | ||
dd2a4343 JG |
313 | static inline int pblk_valid_meta_ppa(struct pblk *pblk, |
314 | struct pblk_line *meta_line, | |
315 | struct ppa_addr *ppa_list, int nr_ppas) | |
316 | { | |
317 | struct nvm_tgt_dev *dev = pblk->dev; | |
318 | struct nvm_geo *geo = &dev->geo; | |
319 | struct pblk_line *data_line; | |
320 | struct ppa_addr ppa, ppa_opt; | |
321 | u64 paddr; | |
322 | int i; | |
323 | ||
324 | data_line = &pblk->lines[pblk_dev_ppa_to_line(ppa_list[0])]; | |
325 | paddr = pblk_lookup_page(pblk, meta_line); | |
326 | ppa = addr_to_gen_ppa(pblk, paddr, 0); | |
327 | ||
328 | if (test_bit(pblk_ppa_to_pos(geo, ppa), data_line->blk_bitmap)) | |
329 | return 1; | |
330 | ||
331 | /* Schedule a metadata I/O that is half the distance from the data I/O | |
332 | * with regards to the number of LUNs forming the pblk instance. This | |
333 | * balances LUN conflicts across every I/O. | |
334 | * | |
335 | * When the LUN configuration changes (e.g., due to GC), this distance | |
336 | * can align, which would result on a LUN deadlock. In this case, modify | |
337 | * the distance to not be optimal, but allow metadata I/Os to succeed. | |
338 | */ | |
339 | ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0); | |
340 | if (unlikely(ppa_opt.ppa == ppa.ppa)) { | |
341 | data_line->meta_distance--; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | for (i = 0; i < nr_ppas; i += pblk->min_write_pgs) | |
346 | if (ppa_list[i].g.ch == ppa_opt.g.ch && | |
347 | ppa_list[i].g.lun == ppa_opt.g.lun) | |
348 | return 1; | |
349 | ||
350 | if (test_bit(pblk_ppa_to_pos(geo, ppa_opt), data_line->blk_bitmap)) { | |
351 | for (i = 0; i < nr_ppas; i += pblk->min_write_pgs) | |
352 | if (ppa_list[i].g.ch == ppa.g.ch && | |
353 | ppa_list[i].g.lun == ppa.g.lun) | |
354 | return 0; | |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) | |
363 | { | |
364 | struct nvm_tgt_dev *dev = pblk->dev; | |
365 | struct nvm_geo *geo = &dev->geo; | |
366 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
367 | struct pblk_line_meta *lm = &pblk->lm; | |
368 | struct pblk_emeta *emeta = meta_line->emeta; | |
369 | struct pblk_g_ctx *m_ctx; | |
370 | struct pblk_lun *rlun; | |
371 | struct bio *bio; | |
372 | struct nvm_rq *rqd; | |
373 | void *data; | |
374 | u64 paddr; | |
375 | int rq_ppas = pblk->min_write_pgs; | |
376 | int id = meta_line->id; | |
377 | int rq_len; | |
378 | int i, j; | |
379 | int ret; | |
380 | ||
381 | rqd = pblk_alloc_rqd(pblk, READ); | |
382 | if (IS_ERR(rqd)) { | |
383 | pr_err("pblk: cannot allocate write req.\n"); | |
384 | return PTR_ERR(rqd); | |
385 | } | |
386 | m_ctx = nvm_rq_to_pdu(rqd); | |
387 | m_ctx->private = meta_line; | |
388 | ||
389 | rq_len = rq_ppas * geo->sec_size; | |
390 | data = ((void *)emeta->buf) + emeta->mem; | |
391 | ||
392 | bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len, GFP_KERNEL); | |
393 | if (IS_ERR(bio)) { | |
394 | ret = PTR_ERR(bio); | |
395 | goto fail_free_rqd; | |
396 | } | |
397 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
398 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); | |
399 | rqd->bio = bio; | |
400 | ||
401 | ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta); | |
402 | if (ret) | |
403 | goto fail_free_bio; | |
404 | ||
405 | for (i = 0; i < rqd->nr_ppas; ) { | |
406 | spin_lock(&meta_line->lock); | |
407 | paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas); | |
408 | spin_unlock(&meta_line->lock); | |
409 | for (j = 0; j < rq_ppas; j++, i++, paddr++) | |
410 | rqd->ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id); | |
411 | } | |
412 | ||
413 | rlun = &pblk->luns[pblk_ppa_to_pos(geo, rqd->ppa_list[0])]; | |
414 | ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(5000)); | |
415 | if (ret) { | |
416 | pr_err("pblk: lun semaphore timed out (%d)\n", ret); | |
417 | goto fail_free_bio; | |
418 | } | |
419 | ||
420 | emeta->mem += rq_len; | |
421 | if (emeta->mem >= lm->emeta_len[0]) { | |
422 | spin_lock(&l_mg->close_lock); | |
423 | list_del(&meta_line->list); | |
424 | WARN(!bitmap_full(meta_line->map_bitmap, lm->sec_per_line), | |
425 | "pblk: corrupt meta line %d\n", meta_line->id); | |
426 | spin_unlock(&l_mg->close_lock); | |
427 | } | |
428 | ||
429 | ret = pblk_submit_io(pblk, rqd); | |
430 | if (ret) { | |
431 | pr_err("pblk: emeta I/O submission failed: %d\n", ret); | |
432 | goto fail_rollback; | |
433 | } | |
434 | ||
435 | return NVM_IO_OK; | |
436 | ||
437 | fail_rollback: | |
438 | spin_lock(&l_mg->close_lock); | |
439 | pblk_dealloc_page(pblk, meta_line, rq_ppas); | |
440 | list_add(&meta_line->list, &meta_line->list); | |
441 | spin_unlock(&l_mg->close_lock); | |
442 | fail_free_bio: | |
f680f19a JG |
443 | if (likely(l_mg->emeta_alloc_type == PBLK_VMALLOC_META)) |
444 | bio_put(bio); | |
dd2a4343 JG |
445 | fail_free_rqd: |
446 | pblk_free_rqd(pblk, rqd, READ); | |
447 | return ret; | |
448 | } | |
449 | ||
450 | static int pblk_sched_meta_io(struct pblk *pblk, struct ppa_addr *prev_list, | |
451 | int prev_n) | |
452 | { | |
453 | struct pblk_line_meta *lm = &pblk->lm; | |
454 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; | |
455 | struct pblk_line *meta_line; | |
456 | ||
457 | spin_lock(&l_mg->close_lock); | |
458 | retry: | |
459 | if (list_empty(&l_mg->emeta_list)) { | |
460 | spin_unlock(&l_mg->close_lock); | |
461 | return 0; | |
462 | } | |
463 | meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list); | |
464 | if (bitmap_full(meta_line->map_bitmap, lm->sec_per_line)) | |
465 | goto retry; | |
466 | spin_unlock(&l_mg->close_lock); | |
467 | ||
468 | if (!pblk_valid_meta_ppa(pblk, meta_line, prev_list, prev_n)) | |
469 | return 0; | |
470 | ||
471 | return pblk_submit_meta_io(pblk, meta_line); | |
472 | } | |
473 | ||
d624f371 JG |
474 | static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd) |
475 | { | |
476 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
477 | struct ppa_addr erase_ppa; | |
478 | int err; | |
479 | ||
480 | ppa_set_empty(&erase_ppa); | |
481 | ||
482 | /* Assign lbas to ppas and populate request structure */ | |
483 | err = pblk_setup_w_rq(pblk, rqd, c_ctx, &erase_ppa); | |
484 | if (err) { | |
485 | pr_err("pblk: could not setup write request: %d\n", err); | |
486 | return NVM_IO_ERR; | |
487 | } | |
488 | ||
dd2a4343 JG |
489 | if (likely(ppa_empty(erase_ppa))) { |
490 | /* Submit metadata write for previous data line */ | |
491 | err = pblk_sched_meta_io(pblk, rqd->ppa_list, rqd->nr_ppas); | |
492 | if (err) { | |
493 | pr_err("pblk: metadata I/O submission failed: %d", err); | |
494 | return NVM_IO_ERR; | |
495 | } | |
496 | ||
497 | /* Submit data write for current data line */ | |
498 | err = pblk_submit_io(pblk, rqd); | |
499 | if (err) { | |
500 | pr_err("pblk: data I/O submission failed: %d\n", err); | |
501 | return NVM_IO_ERR; | |
502 | } | |
503 | } else { | |
504 | /* Submit data write for current data line */ | |
505 | err = pblk_submit_io(pblk, rqd); | |
506 | if (err) { | |
507 | pr_err("pblk: data I/O submission failed: %d\n", err); | |
508 | return NVM_IO_ERR; | |
509 | } | |
d624f371 | 510 | |
dd2a4343 JG |
511 | /* Submit available erase for next data line */ |
512 | if (pblk_blk_erase_async(pblk, erase_ppa)) { | |
513 | struct pblk_line *e_line = pblk_line_get_erase(pblk); | |
514 | struct nvm_tgt_dev *dev = pblk->dev; | |
515 | struct nvm_geo *geo = &dev->geo; | |
516 | int bit; | |
517 | ||
518 | atomic_inc(&e_line->left_eblks); | |
519 | bit = pblk_ppa_to_pos(geo, erase_ppa); | |
520 | WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap)); | |
521 | } | |
d624f371 JG |
522 | } |
523 | ||
524 | return NVM_IO_OK; | |
525 | } | |
526 | ||
527 | static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd) | |
528 | { | |
529 | struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); | |
530 | struct bio *bio = rqd->bio; | |
531 | ||
532 | if (c_ctx->nr_padded) | |
533 | pblk_bio_free_pages(pblk, bio, rqd->nr_ppas, c_ctx->nr_padded); | |
534 | } | |
535 | ||
a4bd217b JG |
536 | static int pblk_submit_write(struct pblk *pblk) |
537 | { | |
538 | struct bio *bio; | |
539 | struct nvm_rq *rqd; | |
a4bd217b JG |
540 | unsigned int secs_avail, secs_to_sync, secs_to_com; |
541 | unsigned int secs_to_flush; | |
542 | unsigned long pos; | |
a4bd217b JG |
543 | |
544 | /* If there are no sectors in the cache, flushes (bios without data) | |
545 | * will be cleared on the cache threads | |
546 | */ | |
547 | secs_avail = pblk_rb_read_count(&pblk->rwb); | |
548 | if (!secs_avail) | |
549 | return 1; | |
550 | ||
551 | secs_to_flush = pblk_rb_sync_point_count(&pblk->rwb); | |
552 | if (!secs_to_flush && secs_avail < pblk->min_write_pgs) | |
553 | return 1; | |
554 | ||
555 | rqd = pblk_alloc_rqd(pblk, WRITE); | |
556 | if (IS_ERR(rqd)) { | |
557 | pr_err("pblk: cannot allocate write req.\n"); | |
558 | return 1; | |
559 | } | |
a4bd217b JG |
560 | |
561 | bio = bio_alloc(GFP_KERNEL, pblk->max_write_pgs); | |
562 | if (!bio) { | |
563 | pr_err("pblk: cannot allocate write bio\n"); | |
564 | goto fail_free_rqd; | |
565 | } | |
566 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
567 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); | |
568 | rqd->bio = bio; | |
569 | ||
570 | secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, secs_to_flush); | |
571 | if (secs_to_sync > pblk->max_write_pgs) { | |
572 | pr_err("pblk: bad buffer sync calculation\n"); | |
573 | goto fail_put_bio; | |
574 | } | |
575 | ||
576 | secs_to_com = (secs_to_sync > secs_avail) ? secs_avail : secs_to_sync; | |
577 | pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com); | |
578 | ||
d624f371 JG |
579 | if (pblk_rb_read_to_bio(&pblk->rwb, rqd, bio, pos, secs_to_sync, |
580 | secs_avail)) { | |
a4bd217b JG |
581 | pr_err("pblk: corrupted write bio\n"); |
582 | goto fail_put_bio; | |
583 | } | |
584 | ||
d624f371 | 585 | if (pblk_submit_io_set(pblk, rqd)) |
a4bd217b | 586 | goto fail_free_bio; |
a4bd217b JG |
587 | |
588 | #ifdef CONFIG_NVM_DEBUG | |
589 | atomic_long_add(secs_to_sync, &pblk->sub_writes); | |
590 | #endif | |
591 | ||
592 | return 0; | |
593 | ||
594 | fail_free_bio: | |
d624f371 | 595 | pblk_free_write_rqd(pblk, rqd); |
a4bd217b JG |
596 | fail_put_bio: |
597 | bio_put(bio); | |
598 | fail_free_rqd: | |
599 | pblk_free_rqd(pblk, rqd, WRITE); | |
600 | ||
601 | return 1; | |
602 | } | |
603 | ||
604 | int pblk_write_ts(void *data) | |
605 | { | |
606 | struct pblk *pblk = data; | |
607 | ||
608 | while (!kthread_should_stop()) { | |
609 | if (!pblk_submit_write(pblk)) | |
610 | continue; | |
611 | set_current_state(TASK_INTERRUPTIBLE); | |
612 | io_schedule(); | |
613 | } | |
614 | ||
615 | return 0; | |
616 | } |