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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, | |
84454e6d | 42 | sector_t blba, unsigned long *read_bitmap) |
a4bd217b | 43 | { |
a4809fee | 44 | struct pblk_sec_meta *meta_list = rqd->meta_list; |
a4bd217b JG |
45 | struct bio *bio = rqd->bio; |
46 | struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS]; | |
a4bd217b | 47 | int nr_secs = rqd->nr_ppas; |
75cb8e93 | 48 | bool advanced_bio = false; |
a4bd217b JG |
49 | int i, j = 0; |
50 | ||
a4bd217b JG |
51 | pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs); |
52 | ||
53 | for (i = 0; i < nr_secs; i++) { | |
54 | struct ppa_addr p = ppas[i]; | |
55 | sector_t lba = blba + i; | |
56 | ||
57 | retry: | |
58 | if (pblk_ppa_empty(p)) { | |
59 | WARN_ON(test_and_set_bit(i, read_bitmap)); | |
a4809fee | 60 | meta_list[i].lba = cpu_to_le64(ADDR_EMPTY); |
75cb8e93 JG |
61 | |
62 | if (unlikely(!advanced_bio)) { | |
63 | bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE); | |
64 | advanced_bio = true; | |
65 | } | |
66 | ||
67 | goto next; | |
a4bd217b JG |
68 | } |
69 | ||
70 | /* Try to read from write buffer. The address is later checked | |
71 | * on the write buffer to prevent retrieving overwritten data. | |
72 | */ | |
73 | if (pblk_addr_in_cache(p)) { | |
75cb8e93 JG |
74 | if (!pblk_read_from_cache(pblk, bio, lba, p, i, |
75 | advanced_bio)) { | |
a4bd217b JG |
76 | pblk_lookup_l2p_seq(pblk, &p, lba, 1); |
77 | goto retry; | |
78 | } | |
79 | WARN_ON(test_and_set_bit(i, read_bitmap)); | |
a4809fee | 80 | meta_list[i].lba = cpu_to_le64(lba); |
75cb8e93 | 81 | advanced_bio = true; |
db7ada33 JG |
82 | #ifdef CONFIG_NVM_DEBUG |
83 | atomic_long_inc(&pblk->cache_reads); | |
84 | #endif | |
a4bd217b JG |
85 | } else { |
86 | /* Read from media non-cached sectors */ | |
87 | rqd->ppa_list[j++] = p; | |
88 | } | |
89 | ||
75cb8e93 | 90 | next: |
a4bd217b JG |
91 | if (advanced_bio) |
92 | bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE); | |
93 | } | |
94 | ||
f9c10152 JG |
95 | if (pblk_io_aligned(pblk, nr_secs)) |
96 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); | |
97 | else | |
98 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); | |
99 | ||
a4bd217b JG |
100 | #ifdef CONFIG_NVM_DEBUG |
101 | atomic_long_add(nr_secs, &pblk->inflight_reads); | |
102 | #endif | |
103 | } | |
104 | ||
105 | static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd) | |
106 | { | |
107 | int err; | |
108 | ||
a4bd217b JG |
109 | err = pblk_submit_io(pblk, rqd); |
110 | if (err) | |
111 | return NVM_IO_ERR; | |
112 | ||
113 | return NVM_IO_OK; | |
114 | } | |
115 | ||
a4809fee JG |
116 | static void pblk_read_check(struct pblk *pblk, struct nvm_rq *rqd, |
117 | sector_t blba) | |
118 | { | |
119 | struct pblk_sec_meta *meta_list = rqd->meta_list; | |
120 | int nr_lbas = rqd->nr_ppas; | |
121 | int i; | |
122 | ||
123 | for (i = 0; i < nr_lbas; i++) { | |
124 | u64 lba = le64_to_cpu(meta_list[i].lba); | |
125 | ||
126 | if (lba == ADDR_EMPTY) | |
127 | continue; | |
128 | ||
129 | WARN(lba != blba + i, "pblk: corrupted read LBA\n"); | |
130 | } | |
131 | } | |
132 | ||
7bd4d370 JG |
133 | static void pblk_read_put_rqd_kref(struct pblk *pblk, struct nvm_rq *rqd) |
134 | { | |
135 | struct ppa_addr *ppa_list; | |
136 | int i; | |
137 | ||
138 | ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr; | |
139 | ||
140 | for (i = 0; i < rqd->nr_ppas; i++) { | |
141 | struct ppa_addr ppa = ppa_list[i]; | |
142 | struct pblk_line *line; | |
143 | ||
b1bcfda1 | 144 | line = &pblk->lines[pblk_ppa_to_line(ppa)]; |
7bd4d370 JG |
145 | kref_put(&line->ref, pblk_line_put_wq); |
146 | } | |
147 | } | |
148 | ||
149 | static void pblk_end_user_read(struct bio *bio) | |
150 | { | |
151 | #ifdef CONFIG_NVM_DEBUG | |
152 | WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n"); | |
153 | #endif | |
154 | bio_endio(bio); | |
155 | bio_put(bio); | |
156 | } | |
157 | ||
158 | static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd, | |
159 | bool put_line) | |
a4bd217b | 160 | { |
998ba629 | 161 | struct nvm_tgt_dev *dev = pblk->dev; |
084ec9ba | 162 | struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); |
a4bd217b | 163 | struct bio *bio = rqd->bio; |
998ba629 JG |
164 | unsigned long start_time = r_ctx->start_time; |
165 | ||
166 | generic_end_io_acct(dev->q, READ, &pblk->disk->part0, start_time); | |
a4bd217b JG |
167 | |
168 | if (rqd->error) | |
169 | pblk_log_read_err(pblk, rqd); | |
170 | #ifdef CONFIG_NVM_DEBUG | |
171 | else | |
4e4cbee9 | 172 | WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n"); |
a4bd217b JG |
173 | #endif |
174 | ||
a4809fee JG |
175 | pblk_read_check(pblk, rqd, r_ctx->lba); |
176 | ||
a4bd217b | 177 | bio_put(bio); |
7bd4d370 JG |
178 | if (r_ctx->private) |
179 | pblk_end_user_read((struct bio *)r_ctx->private); | |
084ec9ba | 180 | |
7bd4d370 JG |
181 | if (put_line) |
182 | pblk_read_put_rqd_kref(pblk, rqd); | |
a4bd217b JG |
183 | |
184 | #ifdef CONFIG_NVM_DEBUG | |
185 | atomic_long_add(rqd->nr_ppas, &pblk->sync_reads); | |
186 | atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads); | |
187 | #endif | |
188 | ||
e2cddf20 | 189 | pblk_free_rqd(pblk, rqd, PBLK_READ); |
588726d3 | 190 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
191 | } |
192 | ||
7bd4d370 JG |
193 | static void pblk_end_io_read(struct nvm_rq *rqd) |
194 | { | |
195 | struct pblk *pblk = rqd->private; | |
196 | ||
197 | __pblk_end_io_read(pblk, rqd, true); | |
198 | } | |
199 | ||
998ba629 JG |
200 | static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, |
201 | unsigned int bio_init_idx, | |
202 | unsigned long *read_bitmap) | |
a4bd217b JG |
203 | { |
204 | struct bio *new_bio, *bio = rqd->bio; | |
a4809fee | 205 | struct pblk_sec_meta *meta_list = rqd->meta_list; |
a4bd217b JG |
206 | struct bio_vec src_bv, dst_bv; |
207 | void *ppa_ptr = NULL; | |
208 | void *src_p, *dst_p; | |
209 | dma_addr_t dma_ppa_list = 0; | |
a4809fee | 210 | __le64 *lba_list_mem, *lba_list_media; |
a4bd217b JG |
211 | int nr_secs = rqd->nr_ppas; |
212 | int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); | |
213 | int i, ret, hole; | |
a4bd217b | 214 | |
a4809fee JG |
215 | /* Re-use allocated memory for intermediate lbas */ |
216 | lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size); | |
217 | lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size); | |
218 | ||
a4bd217b | 219 | new_bio = bio_alloc(GFP_KERNEL, nr_holes); |
a4bd217b JG |
220 | |
221 | if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes)) | |
222 | goto err; | |
223 | ||
224 | if (nr_holes != new_bio->bi_vcnt) { | |
225 | pr_err("pblk: malformed bio\n"); | |
226 | goto err; | |
227 | } | |
228 | ||
a4809fee JG |
229 | for (i = 0; i < nr_secs; i++) |
230 | lba_list_mem[i] = meta_list[i].lba; | |
231 | ||
a4bd217b JG |
232 | new_bio->bi_iter.bi_sector = 0; /* internal bio */ |
233 | bio_set_op_attrs(new_bio, REQ_OP_READ, 0); | |
a4bd217b JG |
234 | |
235 | rqd->bio = new_bio; | |
236 | rqd->nr_ppas = nr_holes; | |
f9c10152 | 237 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); |
a4bd217b | 238 | |
0f9248cf | 239 | if (unlikely(nr_holes == 1)) { |
a4bd217b JG |
240 | ppa_ptr = rqd->ppa_list; |
241 | dma_ppa_list = rqd->dma_ppa_list; | |
242 | rqd->ppa_addr = rqd->ppa_list[0]; | |
243 | } | |
244 | ||
1a94b2d4 | 245 | ret = pblk_submit_io_sync(pblk, rqd); |
a4bd217b JG |
246 | if (ret) { |
247 | bio_put(rqd->bio); | |
1a94b2d4 | 248 | pr_err("pblk: sync read IO submission failed\n"); |
a4bd217b JG |
249 | goto err; |
250 | } | |
251 | ||
a4bd217b JG |
252 | if (rqd->error) { |
253 | atomic_long_inc(&pblk->read_failed); | |
254 | #ifdef CONFIG_NVM_DEBUG | |
255 | pblk_print_failed_rqd(pblk, rqd, rqd->error); | |
256 | #endif | |
257 | } | |
258 | ||
0f9248cf | 259 | if (unlikely(nr_holes == 1)) { |
7bd4d370 JG |
260 | struct ppa_addr ppa; |
261 | ||
262 | ppa = rqd->ppa_addr; | |
a4bd217b JG |
263 | rqd->ppa_list = ppa_ptr; |
264 | rqd->dma_ppa_list = dma_ppa_list; | |
7bd4d370 | 265 | rqd->ppa_list[0] = ppa; |
a4bd217b JG |
266 | } |
267 | ||
a4809fee JG |
268 | for (i = 0; i < nr_secs; i++) { |
269 | lba_list_media[i] = meta_list[i].lba; | |
270 | meta_list[i].lba = lba_list_mem[i]; | |
271 | } | |
272 | ||
a4bd217b JG |
273 | /* Fill the holes in the original bio */ |
274 | i = 0; | |
275 | hole = find_first_zero_bit(read_bitmap, nr_secs); | |
276 | do { | |
b1bcfda1 | 277 | int line_id = pblk_ppa_to_line(rqd->ppa_list[i]); |
7bd4d370 JG |
278 | struct pblk_line *line = &pblk->lines[line_id]; |
279 | ||
280 | kref_put(&line->ref, pblk_line_put); | |
281 | ||
a4809fee JG |
282 | meta_list[hole].lba = lba_list_media[i]; |
283 | ||
a4bd217b JG |
284 | src_bv = new_bio->bi_io_vec[i++]; |
285 | dst_bv = bio->bi_io_vec[bio_init_idx + hole]; | |
286 | ||
287 | src_p = kmap_atomic(src_bv.bv_page); | |
288 | dst_p = kmap_atomic(dst_bv.bv_page); | |
289 | ||
290 | memcpy(dst_p + dst_bv.bv_offset, | |
291 | src_p + src_bv.bv_offset, | |
292 | PBLK_EXPOSED_PAGE_SIZE); | |
293 | ||
294 | kunmap_atomic(src_p); | |
295 | kunmap_atomic(dst_p); | |
296 | ||
bd432417 | 297 | mempool_free(src_bv.bv_page, pblk->page_bio_pool); |
a4bd217b JG |
298 | |
299 | hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1); | |
300 | } while (hole < nr_secs); | |
301 | ||
302 | bio_put(new_bio); | |
303 | ||
304 | /* Complete the original bio and associated request */ | |
7bd4d370 | 305 | bio_endio(bio); |
a4bd217b JG |
306 | rqd->bio = bio; |
307 | rqd->nr_ppas = nr_secs; | |
a4bd217b | 308 | |
7bd4d370 | 309 | __pblk_end_io_read(pblk, rqd, false); |
a4bd217b JG |
310 | return NVM_IO_OK; |
311 | ||
312 | err: | |
998ba629 JG |
313 | pr_err("pblk: failed to perform partial read\n"); |
314 | ||
a4bd217b JG |
315 | /* Free allocated pages in new bio */ |
316 | pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt); | |
7bd4d370 | 317 | __pblk_end_io_read(pblk, rqd, false); |
a4bd217b JG |
318 | return NVM_IO_ERR; |
319 | } | |
320 | ||
321 | static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, | |
84454e6d | 322 | sector_t lba, unsigned long *read_bitmap) |
a4bd217b | 323 | { |
a4809fee | 324 | struct pblk_sec_meta *meta_list = rqd->meta_list; |
a4bd217b JG |
325 | struct bio *bio = rqd->bio; |
326 | struct ppa_addr ppa; | |
a4bd217b JG |
327 | |
328 | pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); | |
329 | ||
330 | #ifdef CONFIG_NVM_DEBUG | |
331 | atomic_long_inc(&pblk->inflight_reads); | |
332 | #endif | |
333 | ||
334 | retry: | |
335 | if (pblk_ppa_empty(ppa)) { | |
336 | WARN_ON(test_and_set_bit(0, read_bitmap)); | |
a4809fee | 337 | meta_list[0].lba = cpu_to_le64(ADDR_EMPTY); |
a4bd217b JG |
338 | return; |
339 | } | |
340 | ||
341 | /* Try to read from write buffer. The address is later checked on the | |
342 | * write buffer to prevent retrieving overwritten data. | |
343 | */ | |
344 | if (pblk_addr_in_cache(ppa)) { | |
75cb8e93 | 345 | if (!pblk_read_from_cache(pblk, bio, lba, ppa, 0, 1)) { |
a4bd217b JG |
346 | pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); |
347 | goto retry; | |
348 | } | |
a4809fee | 349 | |
7bd4d370 | 350 | WARN_ON(test_and_set_bit(0, read_bitmap)); |
a4809fee JG |
351 | meta_list[0].lba = cpu_to_le64(lba); |
352 | ||
db7ada33 | 353 | #ifdef CONFIG_NVM_DEBUG |
7bd4d370 | 354 | atomic_long_inc(&pblk->cache_reads); |
db7ada33 | 355 | #endif |
a4bd217b JG |
356 | } else { |
357 | rqd->ppa_addr = ppa; | |
358 | } | |
f9c10152 JG |
359 | |
360 | rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); | |
a4bd217b JG |
361 | } |
362 | ||
363 | int pblk_submit_read(struct pblk *pblk, struct bio *bio) | |
364 | { | |
365 | struct nvm_tgt_dev *dev = pblk->dev; | |
998ba629 | 366 | struct request_queue *q = dev->q; |
84454e6d | 367 | sector_t blba = pblk_get_lba(bio); |
5bf1e1ee | 368 | unsigned int nr_secs = pblk_get_secs(bio); |
a4809fee | 369 | struct pblk_g_ctx *r_ctx; |
a4bd217b | 370 | struct nvm_rq *rqd; |
a4bd217b | 371 | unsigned int bio_init_idx; |
a4809fee | 372 | unsigned long read_bitmap; /* Max 64 ppas per request */ |
a4bd217b JG |
373 | int ret = NVM_IO_ERR; |
374 | ||
84454e6d JG |
375 | /* logic error: lba out-of-bounds. Ignore read request */ |
376 | if (blba >= pblk->rl.nr_secs || nr_secs > PBLK_MAX_REQ_ADDRS) { | |
377 | WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n", | |
378 | (unsigned long long)blba, nr_secs); | |
a4bd217b | 379 | return NVM_IO_ERR; |
84454e6d | 380 | } |
a4bd217b | 381 | |
998ba629 JG |
382 | generic_start_io_acct(q, READ, bio_sectors(bio), &pblk->disk->part0); |
383 | ||
a4bd217b JG |
384 | bitmap_zero(&read_bitmap, nr_secs); |
385 | ||
e2cddf20 | 386 | rqd = pblk_alloc_rqd(pblk, PBLK_READ); |
a4bd217b JG |
387 | |
388 | rqd->opcode = NVM_OP_PREAD; | |
389 | rqd->bio = bio; | |
390 | rqd->nr_ppas = nr_secs; | |
391 | rqd->private = pblk; | |
392 | rqd->end_io = pblk_end_io_read; | |
393 | ||
a4809fee | 394 | r_ctx = nvm_rq_to_pdu(rqd); |
998ba629 | 395 | r_ctx->start_time = jiffies; |
a4809fee JG |
396 | r_ctx->lba = blba; |
397 | ||
a4bd217b JG |
398 | /* Save the index for this bio's start. This is needed in case |
399 | * we need to fill a partial read. | |
400 | */ | |
401 | bio_init_idx = pblk_get_bi_idx(bio); | |
402 | ||
63e3809c JG |
403 | rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, |
404 | &rqd->dma_meta_list); | |
405 | if (!rqd->meta_list) { | |
406 | pr_err("pblk: not able to allocate ppa list\n"); | |
407 | goto fail_rqd_free; | |
408 | } | |
409 | ||
a4bd217b | 410 | if (nr_secs > 1) { |
63e3809c JG |
411 | rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size; |
412 | rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size; | |
a4bd217b | 413 | |
84454e6d | 414 | pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap); |
a4bd217b | 415 | } else { |
84454e6d | 416 | pblk_read_rq(pblk, rqd, blba, &read_bitmap); |
a4bd217b JG |
417 | } |
418 | ||
419 | bio_get(bio); | |
420 | if (bitmap_full(&read_bitmap, nr_secs)) { | |
421 | bio_endio(bio); | |
588726d3 | 422 | atomic_inc(&pblk->inflight_io); |
7bd4d370 | 423 | __pblk_end_io_read(pblk, rqd, false); |
a4bd217b JG |
424 | return NVM_IO_OK; |
425 | } | |
426 | ||
427 | /* All sectors are to be read from the device */ | |
428 | if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) { | |
429 | struct bio *int_bio = NULL; | |
a4bd217b JG |
430 | |
431 | /* Clone read bio to deal with read errors internally */ | |
b25d5237 | 432 | int_bio = bio_clone_fast(bio, GFP_KERNEL, pblk_bio_set); |
a4bd217b JG |
433 | if (!int_bio) { |
434 | pr_err("pblk: could not clone read bio\n"); | |
998ba629 | 435 | goto fail_end_io; |
a4bd217b JG |
436 | } |
437 | ||
438 | rqd->bio = int_bio; | |
084ec9ba | 439 | r_ctx->private = bio; |
a4bd217b JG |
440 | |
441 | ret = pblk_submit_read_io(pblk, rqd); | |
442 | if (ret) { | |
443 | pr_err("pblk: read IO submission failed\n"); | |
444 | if (int_bio) | |
445 | bio_put(int_bio); | |
998ba629 | 446 | goto fail_end_io; |
a4bd217b JG |
447 | } |
448 | ||
449 | return NVM_IO_OK; | |
450 | } | |
451 | ||
452 | /* The read bio request could be partially filled by the write buffer, | |
453 | * but there are some holes that need to be read from the drive. | |
454 | */ | |
998ba629 | 455 | return pblk_partial_read_bio(pblk, rqd, bio_init_idx, &read_bitmap); |
a4bd217b JG |
456 | |
457 | fail_rqd_free: | |
e2cddf20 | 458 | pblk_free_rqd(pblk, rqd, PBLK_READ); |
a4bd217b | 459 | return ret; |
998ba629 JG |
460 | fail_end_io: |
461 | __pblk_end_io_read(pblk, rqd, false); | |
462 | return ret; | |
a4bd217b JG |
463 | } |
464 | ||
465 | static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, | |
466 | struct pblk_line *line, u64 *lba_list, | |
d340121e | 467 | u64 *paddr_list_gc, unsigned int nr_secs) |
a4bd217b | 468 | { |
d340121e JG |
469 | struct ppa_addr ppa_list_l2p[PBLK_MAX_REQ_ADDRS]; |
470 | struct ppa_addr ppa_gc; | |
a4bd217b JG |
471 | int valid_secs = 0; |
472 | int i; | |
473 | ||
d340121e | 474 | pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs); |
a4bd217b JG |
475 | |
476 | for (i = 0; i < nr_secs; i++) { | |
d340121e JG |
477 | if (lba_list[i] == ADDR_EMPTY) |
478 | continue; | |
479 | ||
480 | ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id); | |
481 | if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) { | |
482 | paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY; | |
a4bd217b JG |
483 | continue; |
484 | } | |
485 | ||
d340121e | 486 | rqd->ppa_list[valid_secs++] = ppa_list_l2p[i]; |
a4bd217b JG |
487 | } |
488 | ||
489 | #ifdef CONFIG_NVM_DEBUG | |
490 | atomic_long_add(valid_secs, &pblk->inflight_reads); | |
491 | #endif | |
d340121e | 492 | |
a4bd217b JG |
493 | return valid_secs; |
494 | } | |
495 | ||
496 | static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, | |
d340121e JG |
497 | struct pblk_line *line, sector_t lba, |
498 | u64 paddr_gc) | |
a4bd217b | 499 | { |
d340121e | 500 | struct ppa_addr ppa_l2p, ppa_gc; |
a4bd217b JG |
501 | int valid_secs = 0; |
502 | ||
659226eb DC |
503 | if (lba == ADDR_EMPTY) |
504 | goto out; | |
505 | ||
a4bd217b | 506 | /* logic error: lba out-of-bounds */ |
2a79efd8 DC |
507 | if (lba >= pblk->rl.nr_secs) { |
508 | WARN(1, "pblk: read lba out of bounds\n"); | |
a4bd217b JG |
509 | goto out; |
510 | } | |
511 | ||
a4bd217b | 512 | spin_lock(&pblk->trans_lock); |
d340121e | 513 | ppa_l2p = pblk_trans_map_get(pblk, lba); |
a4bd217b JG |
514 | spin_unlock(&pblk->trans_lock); |
515 | ||
d340121e JG |
516 | ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id); |
517 | if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) | |
a4bd217b JG |
518 | goto out; |
519 | ||
d340121e | 520 | rqd->ppa_addr = ppa_l2p; |
a4bd217b JG |
521 | valid_secs = 1; |
522 | ||
523 | #ifdef CONFIG_NVM_DEBUG | |
524 | atomic_long_inc(&pblk->inflight_reads); | |
525 | #endif | |
526 | ||
527 | out: | |
528 | return valid_secs; | |
529 | } | |
530 | ||
d340121e | 531 | int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq) |
a4bd217b JG |
532 | { |
533 | struct nvm_tgt_dev *dev = pblk->dev; | |
534 | struct nvm_geo *geo = &dev->geo; | |
a4bd217b JG |
535 | struct bio *bio; |
536 | struct nvm_rq rqd; | |
d340121e JG |
537 | int data_len; |
538 | int ret = NVM_IO_OK; | |
a4bd217b JG |
539 | |
540 | memset(&rqd, 0, sizeof(struct nvm_rq)); | |
541 | ||
63e3809c JG |
542 | rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, |
543 | &rqd.dma_meta_list); | |
544 | if (!rqd.meta_list) | |
d340121e | 545 | return -ENOMEM; |
63e3809c | 546 | |
d340121e | 547 | if (gc_rq->nr_secs > 1) { |
63e3809c JG |
548 | rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size; |
549 | rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size; | |
a4bd217b | 550 | |
d340121e JG |
551 | gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line, |
552 | gc_rq->lba_list, | |
553 | gc_rq->paddr_list, | |
554 | gc_rq->nr_secs); | |
555 | if (gc_rq->secs_to_gc == 1) | |
63e3809c | 556 | rqd.ppa_addr = rqd.ppa_list[0]; |
a4bd217b | 557 | } else { |
d340121e JG |
558 | gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line, |
559 | gc_rq->lba_list[0], | |
560 | gc_rq->paddr_list[0]); | |
a4bd217b JG |
561 | } |
562 | ||
d340121e | 563 | if (!(gc_rq->secs_to_gc)) |
a4bd217b JG |
564 | goto out; |
565 | ||
d340121e JG |
566 | data_len = (gc_rq->secs_to_gc) * geo->sec_size; |
567 | bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len, | |
7d327a9e | 568 | PBLK_VMALLOC_META, GFP_KERNEL); |
a4bd217b JG |
569 | if (IS_ERR(bio)) { |
570 | pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio)); | |
571 | goto err_free_dma; | |
572 | } | |
573 | ||
574 | bio->bi_iter.bi_sector = 0; /* internal bio */ | |
575 | bio_set_op_attrs(bio, REQ_OP_READ, 0); | |
576 | ||
577 | rqd.opcode = NVM_OP_PREAD; | |
d340121e | 578 | rqd.nr_ppas = gc_rq->secs_to_gc; |
f9c10152 | 579 | rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); |
a4bd217b JG |
580 | rqd.bio = bio; |
581 | ||
1a94b2d4 | 582 | if (pblk_submit_io_sync(pblk, &rqd)) { |
d340121e | 583 | ret = -EIO; |
a4bd217b | 584 | pr_err("pblk: GC read request failed\n"); |
7d327a9e | 585 | goto err_free_bio; |
a4bd217b JG |
586 | } |
587 | ||
588726d3 | 588 | atomic_dec(&pblk->inflight_io); |
a4bd217b JG |
589 | |
590 | if (rqd.error) { | |
591 | atomic_long_inc(&pblk->read_failed_gc); | |
592 | #ifdef CONFIG_NVM_DEBUG | |
593 | pblk_print_failed_rqd(pblk, &rqd, rqd.error); | |
594 | #endif | |
595 | } | |
596 | ||
597 | #ifdef CONFIG_NVM_DEBUG | |
d340121e JG |
598 | atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads); |
599 | atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads); | |
600 | atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads); | |
a4bd217b JG |
601 | #endif |
602 | ||
603 | out: | |
63e3809c | 604 | nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); |
d340121e | 605 | return ret; |
a4bd217b | 606 | |
7d327a9e JG |
607 | err_free_bio: |
608 | bio_put(bio); | |
a4bd217b | 609 | err_free_dma: |
63e3809c | 610 | nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); |
d340121e | 611 | return ret; |
a4bd217b | 612 | } |