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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-read.c - pblk's read path | |
17 | */ | |
18 | ||
19 | #include "pblk.h" | |
20 | ||
21 | /* | |
22 | * There is no guarantee that the value read from cache has not been updated and | |
23 | * resides at another location in the cache. We guarantee though that if the | |
24 | * value is read from the cache, it belongs to the mapped lba. In order to | |
25 | * guarantee and order between writes and reads are ordered, a flush must be | |
26 | * issued. | |
27 | */ | |
28 | static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio, | |
29 | sector_t lba, struct ppa_addr ppa, | |
75cb8e93 | 30 | int bio_iter, bool advanced_bio) |
a4bd217b | 31 | { |
880eda54 | 32 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
33 | /* Callers must ensure that the ppa points to a cache address */ |
34 | BUG_ON(pblk_ppa_empty(ppa)); | |
35 | BUG_ON(!pblk_addr_in_cache(ppa)); | |
36 | #endif | |
37 | ||
75cb8e93 JG |
38 | return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa, |
39 | bio_iter, advanced_bio); | |
a4bd217b JG |
40 | } |
41 | ||
42 | static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
87cc40bb JG |
43 | struct bio *bio, sector_t blba, |
44 | unsigned long *read_bitmap) | |
a4bd217b | 45 | { |
faa79f27 | 46 | void *meta_list = rqd->meta_list; |
afdc23c9 | 47 | struct ppa_addr ppas[NVM_MAX_VLBA]; |
a4bd217b | 48 | int nr_secs = rqd->nr_ppas; |
75cb8e93 | 49 | bool advanced_bio = false; |
a4bd217b JG |
50 | int i, j = 0; |
51 | ||
a4bd217b JG |
52 | pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs); |
53 | ||
54 | for (i = 0; i < nr_secs; i++) { | |
55 | struct ppa_addr p = ppas[i]; | |
faa79f27 | 56 | struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); |
a4bd217b JG |
57 | sector_t lba = blba + i; |
58 | ||
59 | retry: | |
60 | if (pblk_ppa_empty(p)) { | |
faa79f27 IK |
61 | __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); |
62 | ||
a4bd217b | 63 | WARN_ON(test_and_set_bit(i, read_bitmap)); |
faa79f27 | 64 | meta->lba = addr_empty; |
75cb8e93 JG |
65 | |
66 | if (unlikely(!advanced_bio)) { | |
67 | bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE); | |
68 | advanced_bio = true; | |
69 | } | |
70 | ||
71 | goto next; | |
a4bd217b JG |
72 | } |
73 | ||
74 | /* Try to read from write buffer. The address is later checked | |
75 | * on the write buffer to prevent retrieving overwritten data. | |
76 | */ | |
77 | if (pblk_addr_in_cache(p)) { | |
75cb8e93 JG |
78 | if (!pblk_read_from_cache(pblk, bio, lba, p, i, |
79 | advanced_bio)) { | |
a4bd217b JG |
80 | pblk_lookup_l2p_seq(pblk, &p, lba, 1); |
81 | goto retry; | |
82 | } | |
83 | WARN_ON(test_and_set_bit(i, read_bitmap)); | |
faa79f27 | 84 | meta->lba = cpu_to_le64(lba); |
75cb8e93 | 85 | advanced_bio = true; |
880eda54 | 86 | #ifdef CONFIG_NVM_PBLK_DEBUG |
db7ada33 JG |
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 | 99 | if (pblk_io_aligned(pblk, nr_secs)) |
d7b68016 | 100 | rqd->is_seq = 1; |
f9c10152 | 101 | |
880eda54 | 102 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
103 | atomic_long_add(nr_secs, &pblk->inflight_reads); |
104 | #endif | |
105 | } | |
106 | ||
a4bd217b | 107 | |
03a34b2d JG |
108 | static void pblk_read_check_seq(struct pblk *pblk, struct nvm_rq *rqd, |
109 | sector_t blba) | |
a4809fee | 110 | { |
faa79f27 | 111 | void *meta_list = rqd->meta_list; |
03a34b2d | 112 | int nr_lbas = rqd->nr_ppas; |
a4809fee JG |
113 | int i; |
114 | ||
55d8ec35 IK |
115 | if (!pblk_is_oob_meta_supported(pblk)) |
116 | return; | |
117 | ||
a4809fee | 118 | for (i = 0; i < nr_lbas; i++) { |
faa79f27 IK |
119 | struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); |
120 | u64 lba = le64_to_cpu(meta->lba); | |
a4809fee JG |
121 | |
122 | if (lba == ADDR_EMPTY) | |
123 | continue; | |
124 | ||
03a34b2d | 125 | if (lba != blba + i) { |
880eda54 | 126 | #ifdef CONFIG_NVM_PBLK_DEBUG |
d68a9344 | 127 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
03a34b2d | 128 | |
d68a9344 | 129 | print_ppa(pblk, &ppa_list[i], "seq", i); |
03a34b2d | 130 | #endif |
4e495a46 | 131 | pblk_err(pblk, "corrupted read LBA (%llu/%llu)\n", |
03a34b2d JG |
132 | lba, (u64)blba + i); |
133 | WARN_ON(1); | |
134 | } | |
a4809fee JG |
135 | } |
136 | } | |
137 | ||
310df582 JG |
138 | /* |
139 | * There can be holes in the lba list. | |
140 | */ | |
03a34b2d JG |
141 | static void pblk_read_check_rand(struct pblk *pblk, struct nvm_rq *rqd, |
142 | u64 *lba_list, int nr_lbas) | |
310df582 | 143 | { |
faa79f27 | 144 | void *meta_lba_list = rqd->meta_list; |
310df582 JG |
145 | int i, j; |
146 | ||
55d8ec35 IK |
147 | if (!pblk_is_oob_meta_supported(pblk)) |
148 | return; | |
149 | ||
310df582 | 150 | for (i = 0, j = 0; i < nr_lbas; i++) { |
faa79f27 IK |
151 | struct pblk_sec_meta *meta = pblk_get_meta(pblk, |
152 | meta_lba_list, j); | |
310df582 JG |
153 | u64 lba = lba_list[i]; |
154 | u64 meta_lba; | |
155 | ||
156 | if (lba == ADDR_EMPTY) | |
157 | continue; | |
158 | ||
faa79f27 | 159 | meta_lba = le64_to_cpu(meta->lba); |
310df582 JG |
160 | |
161 | if (lba != meta_lba) { | |
880eda54 | 162 | #ifdef CONFIG_NVM_PBLK_DEBUG |
d68a9344 | 163 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
03a34b2d | 164 | |
ea1d24bc | 165 | print_ppa(pblk, &ppa_list[j], "rnd", j); |
03a34b2d | 166 | #endif |
4e495a46 | 167 | pblk_err(pblk, "corrupted read LBA (%llu/%llu)\n", |
ea1d24bc | 168 | meta_lba, lba); |
310df582 JG |
169 | WARN_ON(1); |
170 | } | |
03a34b2d JG |
171 | |
172 | j++; | |
310df582 | 173 | } |
03a34b2d JG |
174 | |
175 | WARN_ONCE(j != rqd->nr_ppas, "pblk: corrupted random request\n"); | |
310df582 JG |
176 | } |
177 | ||
7bd4d370 JG |
178 | static void pblk_end_user_read(struct bio *bio) |
179 | { | |
880eda54 | 180 | #ifdef CONFIG_NVM_PBLK_DEBUG |
7bd4d370 JG |
181 | WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n"); |
182 | #endif | |
183 | bio_endio(bio); | |
7bd4d370 JG |
184 | } |
185 | ||
186 | static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd, | |
187 | bool put_line) | |
a4bd217b | 188 | { |
998ba629 | 189 | struct nvm_tgt_dev *dev = pblk->dev; |
084ec9ba | 190 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); |
87cc40bb | 191 | struct bio *int_bio = rqd->bio; |
998ba629 JG |
192 | unsigned long start_time = r_ctx->start_time; |
193 | ||
ddcf35d3 | 194 | generic_end_io_acct(dev->q, REQ_OP_READ, &pblk->disk->part0, start_time); |
a4bd217b JG |
195 | |
196 | if (rqd->error) | |
197 | pblk_log_read_err(pblk, rqd); | |
a4bd217b | 198 | |
03a34b2d | 199 | pblk_read_check_seq(pblk, rqd, r_ctx->lba); |
a4809fee | 200 | |
87cc40bb JG |
201 | if (int_bio) |
202 | bio_put(int_bio); | |
084ec9ba | 203 | |
7bd4d370 | 204 | if (put_line) |
ae14cc04 | 205 | pblk_rq_to_line_put(pblk, rqd); |
a4bd217b | 206 | |
880eda54 | 207 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
208 | atomic_long_add(rqd->nr_ppas, &pblk->sync_reads); |
209 | atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads); | |
210 | #endif | |
211 | ||
e2cddf20 | 212 | pblk_free_rqd(pblk, rqd, PBLK_READ); |
588726d3 | 213 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
214 | } |
215 | ||
7bd4d370 JG |
216 | static void pblk_end_io_read(struct nvm_rq *rqd) |
217 | { | |
218 | struct pblk *pblk = rqd->private; | |
87cc40bb JG |
219 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); |
220 | struct bio *bio = (struct bio *)r_ctx->private; | |
7bd4d370 | 221 | |
87cc40bb | 222 | pblk_end_user_read(bio); |
7bd4d370 JG |
223 | __pblk_end_io_read(pblk, rqd, true); |
224 | } | |
225 | ||
11f6ad69 | 226 | static void pblk_end_partial_read(struct nvm_rq *rqd) |
a4bd217b | 227 | { |
11f6ad69 HL |
228 | struct pblk *pblk = rqd->private; |
229 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); | |
230 | struct pblk_pr_ctx *pr_ctx = r_ctx->private; | |
faa79f27 | 231 | struct pblk_sec_meta *meta; |
11f6ad69 HL |
232 | struct bio *new_bio = rqd->bio; |
233 | struct bio *bio = pr_ctx->orig_bio; | |
a4bd217b | 234 | struct bio_vec src_bv, dst_bv; |
faa79f27 | 235 | void *meta_list = rqd->meta_list; |
11f6ad69 HL |
236 | int bio_init_idx = pr_ctx->bio_init_idx; |
237 | unsigned long *read_bitmap = pr_ctx->bitmap; | |
238 | int nr_secs = pr_ctx->orig_nr_secs; | |
a4bd217b | 239 | int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); |
11f6ad69 HL |
240 | void *src_p, *dst_p; |
241 | int hole, i; | |
a4bd217b | 242 | |
0f9248cf | 243 | if (unlikely(nr_holes == 1)) { |
7bd4d370 JG |
244 | struct ppa_addr ppa; |
245 | ||
246 | ppa = rqd->ppa_addr; | |
11f6ad69 HL |
247 | rqd->ppa_list = pr_ctx->ppa_ptr; |
248 | rqd->dma_ppa_list = pr_ctx->dma_ppa_list; | |
7bd4d370 | 249 | rqd->ppa_list[0] = ppa; |
a4bd217b JG |
250 | } |
251 | ||
a4809fee | 252 | for (i = 0; i < nr_secs; i++) { |
faa79f27 IK |
253 | meta = pblk_get_meta(pblk, meta_list, i); |
254 | pr_ctx->lba_list_media[i] = le64_to_cpu(meta->lba); | |
255 | meta->lba = cpu_to_le64(pr_ctx->lba_list_mem[i]); | |
a4809fee JG |
256 | } |
257 | ||
a4bd217b JG |
258 | /* Fill the holes in the original bio */ |
259 | i = 0; | |
260 | hole = find_first_zero_bit(read_bitmap, nr_secs); | |
261 | do { | |
cb21665c | 262 | struct pblk_line *line; |
7bd4d370 | 263 | |
cb21665c | 264 | line = pblk_ppa_to_line(pblk, rqd->ppa_list[i]); |
7bd4d370 JG |
265 | kref_put(&line->ref, pblk_line_put); |
266 | ||
faa79f27 IK |
267 | meta = pblk_get_meta(pblk, meta_list, hole); |
268 | meta->lba = cpu_to_le64(pr_ctx->lba_list_media[i]); | |
a4809fee | 269 | |
a4bd217b | 270 | src_bv = new_bio->bi_io_vec[i++]; |
11f6ad69 | 271 | dst_bv = bio->bi_io_vec[bio_init_idx + hole]; |
a4bd217b JG |
272 | |
273 | src_p = kmap_atomic(src_bv.bv_page); | |
274 | dst_p = kmap_atomic(dst_bv.bv_page); | |
275 | ||
276 | memcpy(dst_p + dst_bv.bv_offset, | |
277 | src_p + src_bv.bv_offset, | |
278 | PBLK_EXPOSED_PAGE_SIZE); | |
279 | ||
280 | kunmap_atomic(src_p); | |
281 | kunmap_atomic(dst_p); | |
282 | ||
b906bbb6 | 283 | mempool_free(src_bv.bv_page, &pblk->page_bio_pool); |
a4bd217b JG |
284 | |
285 | hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1); | |
286 | } while (hole < nr_secs); | |
287 | ||
288 | bio_put(new_bio); | |
11f6ad69 | 289 | kfree(pr_ctx); |
a4bd217b | 290 | |
87cc40bb JG |
291 | /* restore original request */ |
292 | rqd->bio = NULL; | |
a4bd217b | 293 | rqd->nr_ppas = nr_secs; |
a4bd217b | 294 | |
11f6ad69 | 295 | bio_endio(bio); |
7bd4d370 | 296 | __pblk_end_io_read(pblk, rqd, false); |
11f6ad69 | 297 | } |
a4bd217b | 298 | |
11f6ad69 HL |
299 | static int pblk_setup_partial_read(struct pblk *pblk, struct nvm_rq *rqd, |
300 | unsigned int bio_init_idx, | |
301 | unsigned long *read_bitmap, | |
302 | int nr_holes) | |
303 | { | |
faa79f27 | 304 | void *meta_list = rqd->meta_list; |
11f6ad69 HL |
305 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); |
306 | struct pblk_pr_ctx *pr_ctx; | |
307 | struct bio *new_bio, *bio = r_ctx->private; | |
11f6ad69 HL |
308 | int nr_secs = rqd->nr_ppas; |
309 | int i; | |
310 | ||
11f6ad69 HL |
311 | new_bio = bio_alloc(GFP_KERNEL, nr_holes); |
312 | ||
313 | if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes)) | |
314 | goto fail_bio_put; | |
315 | ||
316 | if (nr_holes != new_bio->bi_vcnt) { | |
317 | WARN_ONCE(1, "pblk: malformed bio\n"); | |
318 | goto fail_free_pages; | |
319 | } | |
320 | ||
dd439496 | 321 | pr_ctx = kzalloc(sizeof(struct pblk_pr_ctx), GFP_KERNEL); |
11f6ad69 HL |
322 | if (!pr_ctx) |
323 | goto fail_free_pages; | |
324 | ||
faa79f27 IK |
325 | for (i = 0; i < nr_secs; i++) { |
326 | struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); | |
327 | ||
328 | pr_ctx->lba_list_mem[i] = le64_to_cpu(meta->lba); | |
329 | } | |
11f6ad69 HL |
330 | |
331 | new_bio->bi_iter.bi_sector = 0; /* internal bio */ | |
332 | bio_set_op_attrs(new_bio, REQ_OP_READ, 0); | |
333 | ||
334 | rqd->bio = new_bio; | |
335 | rqd->nr_ppas = nr_holes; | |
11f6ad69 | 336 | |
11f6ad69 HL |
337 | pr_ctx->orig_bio = bio; |
338 | bitmap_copy(pr_ctx->bitmap, read_bitmap, NVM_MAX_VLBA); | |
339 | pr_ctx->bio_init_idx = bio_init_idx; | |
340 | pr_ctx->orig_nr_secs = nr_secs; | |
341 | r_ctx->private = pr_ctx; | |
342 | ||
343 | if (unlikely(nr_holes == 1)) { | |
344 | pr_ctx->ppa_ptr = rqd->ppa_list; | |
345 | pr_ctx->dma_ppa_list = rqd->dma_ppa_list; | |
346 | rqd->ppa_addr = rqd->ppa_list[0]; | |
347 | } | |
348 | return 0; | |
349 | ||
350 | fail_free_pages: | |
fbadca73 | 351 | pblk_bio_free_pages(pblk, new_bio, 0, new_bio->bi_vcnt); |
11f6ad69 HL |
352 | fail_bio_put: |
353 | bio_put(new_bio); | |
354 | ||
355 | return -ENOMEM; | |
356 | } | |
357 | ||
358 | static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, | |
359 | unsigned int bio_init_idx, | |
360 | unsigned long *read_bitmap, int nr_secs) | |
361 | { | |
362 | int nr_holes; | |
363 | int ret; | |
364 | ||
365 | nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); | |
366 | ||
367 | if (pblk_setup_partial_read(pblk, rqd, bio_init_idx, read_bitmap, | |
368 | nr_holes)) | |
369 | return NVM_IO_ERR; | |
370 | ||
371 | rqd->end_io = pblk_end_partial_read; | |
372 | ||
373 | ret = pblk_submit_io(pblk, rqd); | |
374 | if (ret) { | |
375 | bio_put(rqd->bio); | |
376 | pblk_err(pblk, "partial read IO submission failed\n"); | |
377 | goto err; | |
378 | } | |
379 | ||
380 | return NVM_IO_OK; | |
381 | ||
382 | err: | |
4e495a46 | 383 | pblk_err(pblk, "failed to perform partial read\n"); |
11f6ad69 HL |
384 | |
385 | /* Free allocated pages in new bio */ | |
386 | pblk_bio_free_pages(pblk, rqd->bio, 0, rqd->bio->bi_vcnt); | |
7bd4d370 | 387 | __pblk_end_io_read(pblk, rqd, false); |
a4bd217b JG |
388 | return NVM_IO_ERR; |
389 | } | |
390 | ||
87cc40bb | 391 | static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, struct bio *bio, |
84454e6d | 392 | sector_t lba, unsigned long *read_bitmap) |
a4bd217b | 393 | { |
faa79f27 | 394 | struct pblk_sec_meta *meta = pblk_get_meta(pblk, rqd->meta_list, 0); |
a4bd217b | 395 | struct ppa_addr ppa; |
a4bd217b JG |
396 | |
397 | pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); | |
398 | ||
880eda54 | 399 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
400 | atomic_long_inc(&pblk->inflight_reads); |
401 | #endif | |
402 | ||
403 | retry: | |
404 | if (pblk_ppa_empty(ppa)) { | |
faa79f27 IK |
405 | __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); |
406 | ||
a4bd217b | 407 | WARN_ON(test_and_set_bit(0, read_bitmap)); |
faa79f27 | 408 | meta->lba = addr_empty; |
a4bd217b JG |
409 | return; |
410 | } | |
411 | ||
412 | /* Try to read from write buffer. The address is later checked on the | |
413 | * write buffer to prevent retrieving overwritten data. | |
414 | */ | |
415 | if (pblk_addr_in_cache(ppa)) { | |
75cb8e93 | 416 | if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) { |
a4bd217b JG |
417 | pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); |
418 | goto retry; | |
419 | } | |
a4809fee | 420 | |
7bd4d370 | 421 | WARN_ON(test_and_set_bit(0, read_bitmap)); |
faa79f27 | 422 | meta->lba = cpu_to_le64(lba); |
a4809fee | 423 | |
880eda54 | 424 | #ifdef CONFIG_NVM_PBLK_DEBUG |
7bd4d370 | 425 | atomic_long_inc(&pblk->cache_reads); |
db7ada33 | 426 | #endif |
a4bd217b JG |
427 | } else { |
428 | rqd->ppa_addr = ppa; | |
429 | } | |
430 | } | |
431 | ||
432 | int pblk_submit_read(struct pblk *pblk, struct bio *bio) | |
433 | { | |
434 | struct nvm_tgt_dev *dev = pblk->dev; | |
998ba629 | 435 | struct request_queue *q = dev->q; |
84454e6d | 436 | sector_t blba = pblk_get_lba(bio); |
5bf1e1ee | 437 | unsigned int nr_secs = pblk_get_secs(bio); |
a4809fee | 438 | struct pblk_g_ctx *r_ctx; |
a4bd217b | 439 | struct nvm_rq *rqd; |
a4bd217b | 440 | unsigned int bio_init_idx; |
921aebfa | 441 | DECLARE_BITMAP(read_bitmap, NVM_MAX_VLBA); |
a4bd217b JG |
442 | int ret = NVM_IO_ERR; |
443 | ||
ddcf35d3 MC |
444 | generic_start_io_acct(q, REQ_OP_READ, bio_sectors(bio), |
445 | &pblk->disk->part0); | |
998ba629 | 446 | |
921aebfa | 447 | bitmap_zero(read_bitmap, nr_secs); |
a4bd217b | 448 | |
e2cddf20 | 449 | rqd = pblk_alloc_rqd(pblk, PBLK_READ); |
a4bd217b JG |
450 | |
451 | rqd->opcode = NVM_OP_PREAD; | |
a4bd217b | 452 | rqd->nr_ppas = nr_secs; |
87cc40bb | 453 | rqd->bio = NULL; /* cloned bio if needed */ |
a4bd217b JG |
454 | rqd->private = pblk; |
455 | rqd->end_io = pblk_end_io_read; | |
456 | ||
a4809fee | 457 | r_ctx = nvm_rq_to_pdu(rqd); |
998ba629 | 458 | r_ctx->start_time = jiffies; |
a4809fee | 459 | r_ctx->lba = blba; |
87cc40bb | 460 | r_ctx->private = bio; /* original bio */ |
a4809fee | 461 | |
a4bd217b JG |
462 | /* Save the index for this bio's start. This is needed in case |
463 | * we need to fill a partial read. | |
464 | */ | |
465 | bio_init_idx = pblk_get_bi_idx(bio); | |
466 | ||
45dcf29b | 467 | if (pblk_alloc_rqd_meta(pblk, rqd)) |
63e3809c | 468 | goto fail_rqd_free; |
a4bd217b | 469 | |
45dcf29b | 470 | if (nr_secs > 1) |
921aebfa | 471 | pblk_read_ppalist_rq(pblk, rqd, bio, blba, read_bitmap); |
45dcf29b | 472 | else |
921aebfa | 473 | pblk_read_rq(pblk, rqd, bio, blba, read_bitmap); |
a4bd217b | 474 | |
921aebfa | 475 | if (bitmap_full(read_bitmap, nr_secs)) { |
588726d3 | 476 | atomic_inc(&pblk->inflight_io); |
7bd4d370 | 477 | __pblk_end_io_read(pblk, rqd, false); |
87cc40bb | 478 | return NVM_IO_DONE; |
a4bd217b JG |
479 | } |
480 | ||
481 | /* All sectors are to be read from the device */ | |
921aebfa | 482 | if (bitmap_empty(read_bitmap, rqd->nr_ppas)) { |
a4bd217b | 483 | struct bio *int_bio = NULL; |
a4bd217b JG |
484 | |
485 | /* Clone read bio to deal with read errors internally */ | |
b906bbb6 | 486 | int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set); |
a4bd217b | 487 | if (!int_bio) { |
4e495a46 | 488 | pblk_err(pblk, "could not clone read bio\n"); |
998ba629 | 489 | goto fail_end_io; |
a4bd217b JG |
490 | } |
491 | ||
492 | rqd->bio = int_bio; | |
a4bd217b | 493 | |
e13f421b | 494 | if (pblk_submit_io(pblk, rqd)) { |
4e495a46 | 495 | pblk_err(pblk, "read IO submission failed\n"); |
e13f421b | 496 | ret = NVM_IO_ERR; |
998ba629 | 497 | goto fail_end_io; |
a4bd217b JG |
498 | } |
499 | ||
500 | return NVM_IO_OK; | |
501 | } | |
502 | ||
503 | /* The read bio request could be partially filled by the write buffer, | |
504 | * but there are some holes that need to be read from the drive. | |
505 | */ | |
11f6ad69 HL |
506 | ret = pblk_partial_read_bio(pblk, rqd, bio_init_idx, read_bitmap, |
507 | nr_secs); | |
508 | if (ret) | |
509 | goto fail_meta_free; | |
510 | ||
511 | return NVM_IO_OK; | |
a4bd217b | 512 | |
11f6ad69 HL |
513 | fail_meta_free: |
514 | nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); | |
a4bd217b | 515 | fail_rqd_free: |
e2cddf20 | 516 | pblk_free_rqd(pblk, rqd, PBLK_READ); |
a4bd217b | 517 | return ret; |
998ba629 JG |
518 | fail_end_io: |
519 | __pblk_end_io_read(pblk, rqd, false); | |
520 | return ret; | |
a4bd217b JG |
521 | } |
522 | ||
523 | static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, | |
524 | struct pblk_line *line, u64 *lba_list, | |
d340121e | 525 | u64 *paddr_list_gc, unsigned int nr_secs) |
a4bd217b | 526 | { |
afdc23c9 | 527 | struct ppa_addr ppa_list_l2p[NVM_MAX_VLBA]; |
d340121e | 528 | struct ppa_addr ppa_gc; |
a4bd217b JG |
529 | int valid_secs = 0; |
530 | int i; | |
531 | ||
d340121e | 532 | pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs); |
a4bd217b JG |
533 | |
534 | for (i = 0; i < nr_secs; i++) { | |
d340121e JG |
535 | if (lba_list[i] == ADDR_EMPTY) |
536 | continue; | |
537 | ||
538 | ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id); | |
539 | if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) { | |
540 | paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY; | |
a4bd217b JG |
541 | continue; |
542 | } | |
543 | ||
d340121e | 544 | rqd->ppa_list[valid_secs++] = ppa_list_l2p[i]; |
a4bd217b JG |
545 | } |
546 | ||
880eda54 | 547 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
548 | atomic_long_add(valid_secs, &pblk->inflight_reads); |
549 | #endif | |
d340121e | 550 | |
a4bd217b JG |
551 | return valid_secs; |
552 | } | |
553 | ||
554 | static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, | |
d340121e JG |
555 | struct pblk_line *line, sector_t lba, |
556 | u64 paddr_gc) | |
a4bd217b | 557 | { |
d340121e | 558 | struct ppa_addr ppa_l2p, ppa_gc; |
a4bd217b JG |
559 | int valid_secs = 0; |
560 | ||
659226eb DC |
561 | if (lba == ADDR_EMPTY) |
562 | goto out; | |
563 | ||
a4bd217b | 564 | /* logic error: lba out-of-bounds */ |
2a79efd8 DC |
565 | if (lba >= pblk->rl.nr_secs) { |
566 | WARN(1, "pblk: read lba out of bounds\n"); | |
a4bd217b JG |
567 | goto out; |
568 | } | |
569 | ||
a4bd217b | 570 | spin_lock(&pblk->trans_lock); |
d340121e | 571 | ppa_l2p = pblk_trans_map_get(pblk, lba); |
a4bd217b JG |
572 | spin_unlock(&pblk->trans_lock); |
573 | ||
d340121e JG |
574 | ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id); |
575 | if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) | |
a4bd217b JG |
576 | goto out; |
577 | ||
d340121e | 578 | rqd->ppa_addr = ppa_l2p; |
a4bd217b JG |
579 | valid_secs = 1; |
580 | ||
880eda54 | 581 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
582 | atomic_long_inc(&pblk->inflight_reads); |
583 | #endif | |
584 | ||
585 | out: | |
586 | return valid_secs; | |
587 | } | |
588 | ||
d340121e | 589 | int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq) |
a4bd217b JG |
590 | { |
591 | struct nvm_tgt_dev *dev = pblk->dev; | |
592 | struct nvm_geo *geo = &dev->geo; | |
a4bd217b JG |
593 | struct bio *bio; |
594 | struct nvm_rq rqd; | |
d340121e JG |
595 | int data_len; |
596 | int ret = NVM_IO_OK; | |
a4bd217b JG |
597 | |
598 | memset(&rqd, 0, sizeof(struct nvm_rq)); | |
599 | ||
45dcf29b JG |
600 | ret = pblk_alloc_rqd_meta(pblk, &rqd); |
601 | if (ret) | |
602 | return ret; | |
63e3809c | 603 | |
d340121e | 604 | if (gc_rq->nr_secs > 1) { |
d340121e JG |
605 | gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line, |
606 | gc_rq->lba_list, | |
607 | gc_rq->paddr_list, | |
608 | gc_rq->nr_secs); | |
609 | if (gc_rq->secs_to_gc == 1) | |
63e3809c | 610 | rqd.ppa_addr = rqd.ppa_list[0]; |
a4bd217b | 611 | } else { |
d340121e JG |
612 | gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line, |
613 | gc_rq->lba_list[0], | |
614 | gc_rq->paddr_list[0]); | |
a4bd217b JG |
615 | } |
616 | ||
d340121e | 617 | if (!(gc_rq->secs_to_gc)) |
a4bd217b JG |
618 | goto out; |
619 | ||
e46f4e48 | 620 | data_len = (gc_rq->secs_to_gc) * geo->csecs; |
d340121e | 621 | bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len, |
7d327a9e | 622 | PBLK_VMALLOC_META, GFP_KERNEL); |
a4bd217b | 623 | if (IS_ERR(bio)) { |
4e495a46 | 624 | pblk_err(pblk, "could not allocate GC bio (%lu)\n", |
45dcf29b JG |
625 | PTR_ERR(bio)); |
626 | ret = PTR_ERR(bio); | |
a4bd217b JG |
627 | goto err_free_dma; |
628 | } | |
629 | ||
630 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
631 | bio_set_op_attrs(bio, REQ_OP_READ, 0); | |
632 | ||
633 | rqd.opcode = NVM_OP_PREAD; | |
d340121e | 634 | rqd.nr_ppas = gc_rq->secs_to_gc; |
a4bd217b JG |
635 | rqd.bio = bio; |
636 | ||
1a94b2d4 | 637 | if (pblk_submit_io_sync(pblk, &rqd)) { |
d340121e | 638 | ret = -EIO; |
4e495a46 | 639 | pblk_err(pblk, "GC read request failed\n"); |
7d327a9e | 640 | goto err_free_bio; |
a4bd217b JG |
641 | } |
642 | ||
03a34b2d | 643 | pblk_read_check_rand(pblk, &rqd, gc_rq->lba_list, gc_rq->nr_secs); |
310df582 | 644 | |
588726d3 | 645 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
646 | |
647 | if (rqd.error) { | |
648 | atomic_long_inc(&pblk->read_failed_gc); | |
880eda54 | 649 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
650 | pblk_print_failed_rqd(pblk, &rqd, rqd.error); |
651 | #endif | |
652 | } | |
653 | ||
880eda54 | 654 | #ifdef CONFIG_NVM_PBLK_DEBUG |
d340121e JG |
655 | atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads); |
656 | atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads); | |
657 | atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads); | |
a4bd217b JG |
658 | #endif |
659 | ||
660 | out: | |
45dcf29b | 661 | pblk_free_rqd_meta(pblk, &rqd); |
d340121e | 662 | return ret; |
a4bd217b | 663 | |
7d327a9e JG |
664 | err_free_bio: |
665 | bio_put(bio); | |
a4bd217b | 666 | err_free_dma: |
45dcf29b | 667 | pblk_free_rqd_meta(pblk, &rqd); |
d340121e | 668 | return ret; |
a4bd217b | 669 | } |