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