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-read.c - pblk's read path | |
16 | */ | |
17 | ||
18 | #include "pblk.h" | |
19 | ||
20 | /* | |
21 | * There is no guarantee that the value read from cache has not been updated and | |
22 | * resides at another location in the cache. We guarantee though that if the | |
23 | * value is read from the cache, it belongs to the mapped lba. In order to | |
24 | * guarantee and order between writes and reads are ordered, a flush must be | |
25 | * issued. | |
26 | */ | |
27 | static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio, | |
28 | sector_t lba, struct ppa_addr ppa, | |
75cb8e93 | 29 | int bio_iter, bool advanced_bio) |
a4bd217b JG |
30 | { |
31 | #ifdef CONFIG_NVM_DEBUG | |
32 | /* Callers must ensure that the ppa points to a cache address */ | |
33 | BUG_ON(pblk_ppa_empty(ppa)); | |
34 | BUG_ON(!pblk_addr_in_cache(ppa)); | |
35 | #endif | |
36 | ||
75cb8e93 JG |
37 | return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa, |
38 | bio_iter, advanced_bio); | |
a4bd217b JG |
39 | } |
40 | ||
41 | static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
42 | unsigned long *read_bitmap) | |
43 | { | |
44 | struct bio *bio = rqd->bio; | |
45 | struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS]; | |
46 | sector_t blba = pblk_get_lba(bio); | |
47 | int nr_secs = rqd->nr_ppas; | |
75cb8e93 | 48 | bool advanced_bio = false; |
a4bd217b JG |
49 | int i, j = 0; |
50 | ||
51 | /* logic error: lba out-of-bounds. Ignore read request */ | |
2a79efd8 DC |
52 | if (blba + nr_secs >= pblk->rl.nr_secs) { |
53 | WARN(1, "pblk: read lbas out of bounds\n"); | |
a4bd217b JG |
54 | return; |
55 | } | |
56 | ||
57 | pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs); | |
58 | ||
59 | for (i = 0; i < nr_secs; i++) { | |
60 | struct ppa_addr p = ppas[i]; | |
61 | sector_t lba = blba + i; | |
62 | ||
63 | retry: | |
64 | if (pblk_ppa_empty(p)) { | |
65 | WARN_ON(test_and_set_bit(i, read_bitmap)); | |
75cb8e93 JG |
66 | |
67 | if (unlikely(!advanced_bio)) { | |
68 | bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE); | |
69 | advanced_bio = true; | |
70 | } | |
71 | ||
72 | goto next; | |
a4bd217b JG |
73 | } |
74 | ||
75 | /* Try to read from write buffer. The address is later checked | |
76 | * on the write buffer to prevent retrieving overwritten data. | |
77 | */ | |
78 | if (pblk_addr_in_cache(p)) { | |
75cb8e93 JG |
79 | if (!pblk_read_from_cache(pblk, bio, lba, p, i, |
80 | advanced_bio)) { | |
a4bd217b JG |
81 | pblk_lookup_l2p_seq(pblk, &p, lba, 1); |
82 | goto retry; | |
83 | } | |
84 | WARN_ON(test_and_set_bit(i, read_bitmap)); | |
75cb8e93 | 85 | advanced_bio = true; |
db7ada33 JG |
86 | #ifdef CONFIG_NVM_DEBUG |
87 | atomic_long_inc(&pblk->cache_reads); | |
88 | #endif | |
a4bd217b JG |
89 | } else { |
90 | /* Read from media non-cached sectors */ | |
91 | rqd->ppa_list[j++] = p; | |
92 | } | |
93 | ||
75cb8e93 | 94 | next: |
a4bd217b JG |
95 | if (advanced_bio) |
96 | bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE); | |
97 | } | |
98 | ||
f9c10152 JG |
99 | if (pblk_io_aligned(pblk, nr_secs)) |
100 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); | |
101 | else | |
102 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); | |
103 | ||
a4bd217b JG |
104 | #ifdef CONFIG_NVM_DEBUG |
105 | atomic_long_add(nr_secs, &pblk->inflight_reads); | |
106 | #endif | |
107 | } | |
108 | ||
109 | static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd) | |
110 | { | |
111 | int err; | |
112 | ||
a4bd217b JG |
113 | err = pblk_submit_io(pblk, rqd); |
114 | if (err) | |
115 | return NVM_IO_ERR; | |
116 | ||
117 | return NVM_IO_OK; | |
118 | } | |
119 | ||
120 | static void pblk_end_io_read(struct nvm_rq *rqd) | |
121 | { | |
122 | struct pblk *pblk = rqd->private; | |
123 | struct nvm_tgt_dev *dev = pblk->dev; | |
084ec9ba | 124 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); |
a4bd217b JG |
125 | struct bio *bio = rqd->bio; |
126 | ||
127 | if (rqd->error) | |
128 | pblk_log_read_err(pblk, rqd); | |
129 | #ifdef CONFIG_NVM_DEBUG | |
130 | else | |
4e4cbee9 | 131 | WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n"); |
a4bd217b JG |
132 | #endif |
133 | ||
63e3809c | 134 | nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); |
a4bd217b JG |
135 | |
136 | bio_put(bio); | |
084ec9ba JG |
137 | if (r_ctx->private) { |
138 | struct bio *orig_bio = r_ctx->private; | |
139 | ||
a4bd217b | 140 | #ifdef CONFIG_NVM_DEBUG |
084ec9ba | 141 | WARN_ONCE(orig_bio->bi_status, "pblk: corrupted read bio\n"); |
a4bd217b | 142 | #endif |
084ec9ba JG |
143 | bio_endio(orig_bio); |
144 | bio_put(orig_bio); | |
a4bd217b JG |
145 | } |
146 | ||
147 | #ifdef CONFIG_NVM_DEBUG | |
148 | atomic_long_add(rqd->nr_ppas, &pblk->sync_reads); | |
149 | atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads); | |
150 | #endif | |
151 | ||
152 | pblk_free_rqd(pblk, rqd, READ); | |
588726d3 | 153 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
154 | } |
155 | ||
156 | static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, | |
157 | unsigned int bio_init_idx, | |
158 | unsigned long *read_bitmap) | |
159 | { | |
160 | struct bio *new_bio, *bio = rqd->bio; | |
161 | struct bio_vec src_bv, dst_bv; | |
162 | void *ppa_ptr = NULL; | |
163 | void *src_p, *dst_p; | |
164 | dma_addr_t dma_ppa_list = 0; | |
165 | int nr_secs = rqd->nr_ppas; | |
166 | int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); | |
167 | int i, ret, hole; | |
168 | DECLARE_COMPLETION_ONSTACK(wait); | |
169 | ||
170 | new_bio = bio_alloc(GFP_KERNEL, nr_holes); | |
171 | if (!new_bio) { | |
172 | pr_err("pblk: could not alloc read bio\n"); | |
173 | return NVM_IO_ERR; | |
174 | } | |
175 | ||
176 | if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes)) | |
177 | goto err; | |
178 | ||
179 | if (nr_holes != new_bio->bi_vcnt) { | |
180 | pr_err("pblk: malformed bio\n"); | |
181 | goto err; | |
182 | } | |
183 | ||
184 | new_bio->bi_iter.bi_sector = 0; /* internal bio */ | |
185 | bio_set_op_attrs(new_bio, REQ_OP_READ, 0); | |
186 | new_bio->bi_private = &wait; | |
187 | new_bio->bi_end_io = pblk_end_bio_sync; | |
188 | ||
189 | rqd->bio = new_bio; | |
190 | rqd->nr_ppas = nr_holes; | |
f9c10152 | 191 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); |
a4bd217b JG |
192 | rqd->end_io = NULL; |
193 | ||
194 | if (unlikely(nr_secs > 1 && nr_holes == 1)) { | |
195 | ppa_ptr = rqd->ppa_list; | |
196 | dma_ppa_list = rqd->dma_ppa_list; | |
197 | rqd->ppa_addr = rqd->ppa_list[0]; | |
198 | } | |
199 | ||
200 | ret = pblk_submit_read_io(pblk, rqd); | |
201 | if (ret) { | |
202 | bio_put(rqd->bio); | |
203 | pr_err("pblk: read IO submission failed\n"); | |
204 | goto err; | |
205 | } | |
206 | ||
207 | if (!wait_for_completion_io_timeout(&wait, | |
208 | msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { | |
209 | pr_err("pblk: partial read I/O timed out\n"); | |
210 | } | |
211 | ||
212 | if (rqd->error) { | |
213 | atomic_long_inc(&pblk->read_failed); | |
214 | #ifdef CONFIG_NVM_DEBUG | |
215 | pblk_print_failed_rqd(pblk, rqd, rqd->error); | |
216 | #endif | |
217 | } | |
218 | ||
219 | if (unlikely(nr_secs > 1 && nr_holes == 1)) { | |
220 | rqd->ppa_list = ppa_ptr; | |
221 | rqd->dma_ppa_list = dma_ppa_list; | |
222 | } | |
223 | ||
224 | /* Fill the holes in the original bio */ | |
225 | i = 0; | |
226 | hole = find_first_zero_bit(read_bitmap, nr_secs); | |
227 | do { | |
228 | src_bv = new_bio->bi_io_vec[i++]; | |
229 | dst_bv = bio->bi_io_vec[bio_init_idx + hole]; | |
230 | ||
231 | src_p = kmap_atomic(src_bv.bv_page); | |
232 | dst_p = kmap_atomic(dst_bv.bv_page); | |
233 | ||
234 | memcpy(dst_p + dst_bv.bv_offset, | |
235 | src_p + src_bv.bv_offset, | |
236 | PBLK_EXPOSED_PAGE_SIZE); | |
237 | ||
238 | kunmap_atomic(src_p); | |
239 | kunmap_atomic(dst_p); | |
240 | ||
241 | mempool_free(src_bv.bv_page, pblk->page_pool); | |
242 | ||
243 | hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1); | |
244 | } while (hole < nr_secs); | |
245 | ||
246 | bio_put(new_bio); | |
247 | ||
248 | /* Complete the original bio and associated request */ | |
249 | rqd->bio = bio; | |
250 | rqd->nr_ppas = nr_secs; | |
251 | rqd->private = pblk; | |
252 | ||
253 | bio_endio(bio); | |
254 | pblk_end_io_read(rqd); | |
255 | return NVM_IO_OK; | |
256 | ||
257 | err: | |
258 | /* Free allocated pages in new bio */ | |
259 | pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt); | |
260 | rqd->private = pblk; | |
261 | pblk_end_io_read(rqd); | |
262 | return NVM_IO_ERR; | |
263 | } | |
264 | ||
265 | static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
266 | unsigned long *read_bitmap) | |
267 | { | |
268 | struct bio *bio = rqd->bio; | |
269 | struct ppa_addr ppa; | |
270 | sector_t lba = pblk_get_lba(bio); | |
271 | ||
272 | /* logic error: lba out-of-bounds. Ignore read request */ | |
2a79efd8 DC |
273 | if (lba >= pblk->rl.nr_secs) { |
274 | WARN(1, "pblk: read lba out of bounds\n"); | |
a4bd217b JG |
275 | return; |
276 | } | |
277 | ||
278 | pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); | |
279 | ||
280 | #ifdef CONFIG_NVM_DEBUG | |
281 | atomic_long_inc(&pblk->inflight_reads); | |
282 | #endif | |
283 | ||
284 | retry: | |
285 | if (pblk_ppa_empty(ppa)) { | |
286 | WARN_ON(test_and_set_bit(0, read_bitmap)); | |
287 | return; | |
288 | } | |
289 | ||
290 | /* Try to read from write buffer. The address is later checked on the | |
291 | * write buffer to prevent retrieving overwritten data. | |
292 | */ | |
293 | if (pblk_addr_in_cache(ppa)) { | |
75cb8e93 | 294 | if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) { |
a4bd217b JG |
295 | pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); |
296 | goto retry; | |
297 | } | |
298 | WARN_ON(test_and_set_bit(0, read_bitmap)); | |
db7ada33 JG |
299 | #ifdef CONFIG_NVM_DEBUG |
300 | atomic_long_inc(&pblk->cache_reads); | |
301 | #endif | |
a4bd217b JG |
302 | } else { |
303 | rqd->ppa_addr = ppa; | |
304 | } | |
f9c10152 JG |
305 | |
306 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); | |
a4bd217b JG |
307 | } |
308 | ||
309 | int pblk_submit_read(struct pblk *pblk, struct bio *bio) | |
310 | { | |
311 | struct nvm_tgt_dev *dev = pblk->dev; | |
5bf1e1ee | 312 | unsigned int nr_secs = pblk_get_secs(bio); |
a4bd217b JG |
313 | struct nvm_rq *rqd; |
314 | unsigned long read_bitmap; /* Max 64 ppas per request */ | |
315 | unsigned int bio_init_idx; | |
316 | int ret = NVM_IO_ERR; | |
317 | ||
318 | if (nr_secs > PBLK_MAX_REQ_ADDRS) | |
319 | return NVM_IO_ERR; | |
320 | ||
321 | bitmap_zero(&read_bitmap, nr_secs); | |
322 | ||
323 | rqd = pblk_alloc_rqd(pblk, READ); | |
324 | if (IS_ERR(rqd)) { | |
325 | pr_err_ratelimited("pblk: not able to alloc rqd"); | |
326 | return NVM_IO_ERR; | |
327 | } | |
328 | ||
329 | rqd->opcode = NVM_OP_PREAD; | |
330 | rqd->bio = bio; | |
331 | rqd->nr_ppas = nr_secs; | |
332 | rqd->private = pblk; | |
333 | rqd->end_io = pblk_end_io_read; | |
334 | ||
335 | /* Save the index for this bio's start. This is needed in case | |
336 | * we need to fill a partial read. | |
337 | */ | |
338 | bio_init_idx = pblk_get_bi_idx(bio); | |
339 | ||
63e3809c JG |
340 | rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, |
341 | &rqd->dma_meta_list); | |
342 | if (!rqd->meta_list) { | |
343 | pr_err("pblk: not able to allocate ppa list\n"); | |
344 | goto fail_rqd_free; | |
345 | } | |
346 | ||
a4bd217b | 347 | if (nr_secs > 1) { |
63e3809c JG |
348 | rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size; |
349 | rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size; | |
a4bd217b JG |
350 | |
351 | pblk_read_ppalist_rq(pblk, rqd, &read_bitmap); | |
352 | } else { | |
353 | pblk_read_rq(pblk, rqd, &read_bitmap); | |
354 | } | |
355 | ||
356 | bio_get(bio); | |
357 | if (bitmap_full(&read_bitmap, nr_secs)) { | |
358 | bio_endio(bio); | |
588726d3 | 359 | atomic_inc(&pblk->inflight_io); |
a4bd217b JG |
360 | pblk_end_io_read(rqd); |
361 | return NVM_IO_OK; | |
362 | } | |
363 | ||
364 | /* All sectors are to be read from the device */ | |
365 | if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) { | |
366 | struct bio *int_bio = NULL; | |
084ec9ba | 367 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); |
a4bd217b JG |
368 | |
369 | /* Clone read bio to deal with read errors internally */ | |
b25d5237 | 370 | int_bio = bio_clone_fast(bio, GFP_KERNEL, pblk_bio_set); |
a4bd217b JG |
371 | if (!int_bio) { |
372 | pr_err("pblk: could not clone read bio\n"); | |
373 | return NVM_IO_ERR; | |
374 | } | |
375 | ||
376 | rqd->bio = int_bio; | |
084ec9ba | 377 | r_ctx->private = bio; |
a4bd217b JG |
378 | |
379 | ret = pblk_submit_read_io(pblk, rqd); | |
380 | if (ret) { | |
381 | pr_err("pblk: read IO submission failed\n"); | |
382 | if (int_bio) | |
383 | bio_put(int_bio); | |
384 | return ret; | |
385 | } | |
386 | ||
387 | return NVM_IO_OK; | |
388 | } | |
389 | ||
390 | /* The read bio request could be partially filled by the write buffer, | |
391 | * but there are some holes that need to be read from the drive. | |
392 | */ | |
393 | ret = pblk_fill_partial_read_bio(pblk, rqd, bio_init_idx, &read_bitmap); | |
394 | if (ret) { | |
395 | pr_err("pblk: failed to perform partial read\n"); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | return NVM_IO_OK; | |
400 | ||
401 | fail_rqd_free: | |
402 | pblk_free_rqd(pblk, rqd, READ); | |
403 | return ret; | |
404 | } | |
405 | ||
406 | static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, | |
407 | struct pblk_line *line, u64 *lba_list, | |
408 | unsigned int nr_secs) | |
409 | { | |
410 | struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS]; | |
411 | int valid_secs = 0; | |
412 | int i; | |
413 | ||
414 | pblk_lookup_l2p_rand(pblk, ppas, lba_list, nr_secs); | |
415 | ||
416 | for (i = 0; i < nr_secs; i++) { | |
417 | if (pblk_addr_in_cache(ppas[i]) || ppas[i].g.blk != line->id || | |
418 | pblk_ppa_empty(ppas[i])) { | |
419 | lba_list[i] = ADDR_EMPTY; | |
420 | continue; | |
421 | } | |
422 | ||
423 | rqd->ppa_list[valid_secs++] = ppas[i]; | |
424 | } | |
425 | ||
426 | #ifdef CONFIG_NVM_DEBUG | |
427 | atomic_long_add(valid_secs, &pblk->inflight_reads); | |
428 | #endif | |
429 | return valid_secs; | |
430 | } | |
431 | ||
432 | static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, | |
433 | struct pblk_line *line, sector_t lba) | |
434 | { | |
435 | struct ppa_addr ppa; | |
436 | int valid_secs = 0; | |
437 | ||
659226eb DC |
438 | if (lba == ADDR_EMPTY) |
439 | goto out; | |
440 | ||
a4bd217b | 441 | /* logic error: lba out-of-bounds */ |
2a79efd8 DC |
442 | if (lba >= pblk->rl.nr_secs) { |
443 | WARN(1, "pblk: read lba out of bounds\n"); | |
a4bd217b JG |
444 | goto out; |
445 | } | |
446 | ||
a4bd217b JG |
447 | spin_lock(&pblk->trans_lock); |
448 | ppa = pblk_trans_map_get(pblk, lba); | |
449 | spin_unlock(&pblk->trans_lock); | |
450 | ||
451 | /* Ignore updated values until the moment */ | |
452 | if (pblk_addr_in_cache(ppa) || ppa.g.blk != line->id || | |
453 | pblk_ppa_empty(ppa)) | |
454 | goto out; | |
455 | ||
456 | rqd->ppa_addr = ppa; | |
457 | valid_secs = 1; | |
458 | ||
459 | #ifdef CONFIG_NVM_DEBUG | |
460 | atomic_long_inc(&pblk->inflight_reads); | |
461 | #endif | |
462 | ||
463 | out: | |
464 | return valid_secs; | |
465 | } | |
466 | ||
467 | int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data, | |
468 | unsigned int nr_secs, unsigned int *secs_to_gc, | |
469 | struct pblk_line *line) | |
470 | { | |
471 | struct nvm_tgt_dev *dev = pblk->dev; | |
472 | struct nvm_geo *geo = &dev->geo; | |
a4bd217b JG |
473 | struct bio *bio; |
474 | struct nvm_rq rqd; | |
475 | int ret, data_len; | |
476 | DECLARE_COMPLETION_ONSTACK(wait); | |
477 | ||
478 | memset(&rqd, 0, sizeof(struct nvm_rq)); | |
479 | ||
63e3809c JG |
480 | rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, |
481 | &rqd.dma_meta_list); | |
482 | if (!rqd.meta_list) | |
483 | return NVM_IO_ERR; | |
484 | ||
a4bd217b | 485 | if (nr_secs > 1) { |
63e3809c JG |
486 | rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size; |
487 | rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size; | |
a4bd217b JG |
488 | |
489 | *secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, line, lba_list, | |
490 | nr_secs); | |
63e3809c JG |
491 | if (*secs_to_gc == 1) |
492 | rqd.ppa_addr = rqd.ppa_list[0]; | |
a4bd217b JG |
493 | } else { |
494 | *secs_to_gc = read_rq_gc(pblk, &rqd, line, lba_list[0]); | |
495 | } | |
496 | ||
497 | if (!(*secs_to_gc)) | |
498 | goto out; | |
499 | ||
500 | data_len = (*secs_to_gc) * geo->sec_size; | |
de54e703 JG |
501 | bio = pblk_bio_map_addr(pblk, data, *secs_to_gc, data_len, |
502 | PBLK_KMALLOC_META, GFP_KERNEL); | |
a4bd217b JG |
503 | if (IS_ERR(bio)) { |
504 | pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio)); | |
505 | goto err_free_dma; | |
506 | } | |
507 | ||
508 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
509 | bio_set_op_attrs(bio, REQ_OP_READ, 0); | |
510 | ||
511 | rqd.opcode = NVM_OP_PREAD; | |
512 | rqd.end_io = pblk_end_io_sync; | |
513 | rqd.private = &wait; | |
514 | rqd.nr_ppas = *secs_to_gc; | |
f9c10152 | 515 | rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); |
a4bd217b JG |
516 | rqd.bio = bio; |
517 | ||
518 | ret = pblk_submit_read_io(pblk, &rqd); | |
519 | if (ret) { | |
520 | bio_endio(bio); | |
521 | pr_err("pblk: GC read request failed\n"); | |
522 | goto err_free_dma; | |
523 | } | |
524 | ||
525 | if (!wait_for_completion_io_timeout(&wait, | |
526 | msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { | |
527 | pr_err("pblk: GC read I/O timed out\n"); | |
528 | } | |
588726d3 | 529 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
530 | |
531 | if (rqd.error) { | |
532 | atomic_long_inc(&pblk->read_failed_gc); | |
533 | #ifdef CONFIG_NVM_DEBUG | |
534 | pblk_print_failed_rqd(pblk, &rqd, rqd.error); | |
535 | #endif | |
536 | } | |
537 | ||
538 | #ifdef CONFIG_NVM_DEBUG | |
539 | atomic_long_add(*secs_to_gc, &pblk->sync_reads); | |
540 | atomic_long_add(*secs_to_gc, &pblk->recov_gc_reads); | |
541 | atomic_long_sub(*secs_to_gc, &pblk->inflight_reads); | |
542 | #endif | |
543 | ||
544 | out: | |
63e3809c | 545 | nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); |
a4bd217b JG |
546 | return NVM_IO_OK; |
547 | ||
548 | err_free_dma: | |
63e3809c | 549 | nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); |
a4bd217b JG |
550 | return NVM_IO_ERR; |
551 | } |