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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-map.c - pblk's lba-ppa mapping strategy | |
17 | * | |
18 | */ | |
19 | ||
20 | #include "pblk.h" | |
21 | ||
2deeefc0 JG |
22 | static int pblk_map_page_data(struct pblk *pblk, unsigned int sentry, |
23 | struct ppa_addr *ppa_list, | |
24 | unsigned long *lun_bitmap, | |
faa79f27 | 25 | void *meta_list, |
2deeefc0 | 26 | unsigned int valid_secs) |
a4bd217b JG |
27 | { |
28 | struct pblk_line *line = pblk_line_get_data(pblk); | |
21d22871 | 29 | struct pblk_emeta *emeta; |
a4bd217b | 30 | struct pblk_w_ctx *w_ctx; |
21d22871 | 31 | __le64 *lba_list; |
a4bd217b JG |
32 | u64 paddr; |
33 | int nr_secs = pblk->min_write_pgs; | |
34 | int i; | |
35 | ||
525f7bb2 HH |
36 | if (!line) |
37 | return -ENOSPC; | |
38 | ||
21d22871 JG |
39 | if (pblk_line_is_full(line)) { |
40 | struct pblk_line *prev_line = line; | |
41 | ||
2deeefc0 JG |
42 | /* If we cannot allocate a new line, make sure to store metadata |
43 | * on current line and then fail | |
44 | */ | |
21d22871 JG |
45 | line = pblk_line_replace_data(pblk); |
46 | pblk_line_close_meta(pblk, prev_line); | |
2deeefc0 | 47 | |
525f7bb2 HH |
48 | if (!line) { |
49 | pblk_pipeline_stop(pblk); | |
50 | return -ENOSPC; | |
51 | } | |
52 | ||
21d22871 JG |
53 | } |
54 | ||
55 | emeta = line->emeta; | |
56 | lba_list = emeta_to_lbas(pblk, emeta->buf); | |
57 | ||
a4bd217b JG |
58 | paddr = pblk_alloc_page(pblk, line, nr_secs); |
59 | ||
60 | for (i = 0; i < nr_secs; i++, paddr++) { | |
faa79f27 | 61 | struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); |
03e868eb HH |
62 | __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); |
63 | ||
a4bd217b JG |
64 | /* ppa to be sent to the device */ |
65 | ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id); | |
66 | ||
67 | /* Write context for target bio completion on write buffer. Note | |
68 | * that the write buffer is protected by the sync backpointer, | |
69 | * and a single writer thread have access to each specific entry | |
70 | * at a time. Thus, it is safe to modify the context for the | |
71 | * entry we are setting up for submission without taking any | |
72 | * lock or memory barrier. | |
73 | */ | |
74 | if (i < valid_secs) { | |
75 | kref_get(&line->ref); | |
76 | w_ctx = pblk_rb_w_ctx(&pblk->rwb, sentry + i); | |
77 | w_ctx->ppa = ppa_list[i]; | |
faa79f27 | 78 | meta->lba = cpu_to_le64(w_ctx->lba); |
a4bd217b | 79 | lba_list[paddr] = cpu_to_le64(w_ctx->lba); |
03e868eb HH |
80 | if (lba_list[paddr] != addr_empty) |
81 | line->nr_valid_lbas++; | |
76758390 HH |
82 | else |
83 | atomic64_inc(&pblk->pad_wa); | |
a4bd217b | 84 | } else { |
faa79f27 IK |
85 | lba_list[paddr] = addr_empty; |
86 | meta->lba = addr_empty; | |
0880a9aa | 87 | __pblk_map_invalidate(pblk, line, paddr); |
a4bd217b JG |
88 | } |
89 | } | |
90 | ||
43241cfe | 91 | pblk_down_rq(pblk, ppa_list[0], lun_bitmap); |
2deeefc0 | 92 | return 0; |
a4bd217b JG |
93 | } |
94 | ||
525f7bb2 | 95 | int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry, |
a4bd217b JG |
96 | unsigned long *lun_bitmap, unsigned int valid_secs, |
97 | unsigned int off) | |
98 | { | |
55d8ec35 | 99 | void *meta_list = pblk_get_meta_for_writes(pblk, rqd); |
faa79f27 | 100 | void *meta_buffer; |
d68a9344 | 101 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
a4bd217b JG |
102 | unsigned int map_secs; |
103 | int min = pblk->min_write_pgs; | |
104 | int i; | |
525f7bb2 | 105 | int ret; |
a4bd217b JG |
106 | |
107 | for (i = off; i < rqd->nr_ppas; i += min) { | |
108 | map_secs = (i + min > valid_secs) ? (valid_secs % min) : min; | |
faa79f27 | 109 | meta_buffer = pblk_get_meta(pblk, meta_list, i); |
525f7bb2 HH |
110 | |
111 | ret = pblk_map_page_data(pblk, sentry + i, &ppa_list[i], | |
faa79f27 | 112 | lun_bitmap, meta_buffer, map_secs); |
525f7bb2 HH |
113 | if (ret) |
114 | return ret; | |
a4bd217b | 115 | } |
525f7bb2 HH |
116 | |
117 | return 0; | |
a4bd217b JG |
118 | } |
119 | ||
120 | /* only if erase_ppa is set, acquire erase semaphore */ | |
525f7bb2 | 121 | int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd, |
a4bd217b JG |
122 | unsigned int sentry, unsigned long *lun_bitmap, |
123 | unsigned int valid_secs, struct ppa_addr *erase_ppa) | |
124 | { | |
125 | struct nvm_tgt_dev *dev = pblk->dev; | |
126 | struct nvm_geo *geo = &dev->geo; | |
d624f371 | 127 | struct pblk_line_meta *lm = &pblk->lm; |
55d8ec35 | 128 | void *meta_list = pblk_get_meta_for_writes(pblk, rqd); |
faa79f27 | 129 | void *meta_buffer; |
d68a9344 | 130 | struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
d624f371 | 131 | struct pblk_line *e_line, *d_line; |
a4bd217b JG |
132 | unsigned int map_secs; |
133 | int min = pblk->min_write_pgs; | |
134 | int i, erase_lun; | |
525f7bb2 HH |
135 | int ret; |
136 | ||
a4bd217b JG |
137 | |
138 | for (i = 0; i < rqd->nr_ppas; i += min) { | |
139 | map_secs = (i + min > valid_secs) ? (valid_secs % min) : min; | |
faa79f27 | 140 | meta_buffer = pblk_get_meta(pblk, meta_list, i); |
525f7bb2 HH |
141 | |
142 | ret = pblk_map_page_data(pblk, sentry + i, &ppa_list[i], | |
faa79f27 | 143 | lun_bitmap, meta_buffer, map_secs); |
525f7bb2 HH |
144 | if (ret) |
145 | return ret; | |
a4bd217b | 146 | |
d68a9344 | 147 | erase_lun = pblk_ppa_to_pos(geo, ppa_list[i]); |
dd2a4343 | 148 | |
588726d3 JG |
149 | /* line can change after page map. We might also be writing the |
150 | * last line. | |
151 | */ | |
152 | e_line = pblk_line_get_erase(pblk); | |
153 | if (!e_line) | |
154 | return pblk_map_rq(pblk, rqd, sentry, lun_bitmap, | |
155 | valid_secs, i + min); | |
156 | ||
d624f371 | 157 | spin_lock(&e_line->lock); |
a4bd217b | 158 | if (!test_bit(erase_lun, e_line->erase_bitmap)) { |
a4bd217b | 159 | set_bit(erase_lun, e_line->erase_bitmap); |
a44f53fa | 160 | atomic_dec(&e_line->left_eblks); |
d624f371 | 161 | |
d68a9344 | 162 | *erase_ppa = ppa_list[i]; |
69471513 | 163 | erase_ppa->a.blk = e_line->id; |
a4bd217b | 164 | |
d624f371 JG |
165 | spin_unlock(&e_line->lock); |
166 | ||
a4bd217b JG |
167 | /* Avoid evaluating e_line->left_eblks */ |
168 | return pblk_map_rq(pblk, rqd, sentry, lun_bitmap, | |
169 | valid_secs, i + min); | |
170 | } | |
d624f371 | 171 | spin_unlock(&e_line->lock); |
a4bd217b JG |
172 | } |
173 | ||
d624f371 | 174 | d_line = pblk_line_get_data(pblk); |
a4bd217b | 175 | |
588726d3 JG |
176 | /* line can change after page map. We might also be writing the |
177 | * last line. | |
178 | */ | |
179 | e_line = pblk_line_get_erase(pblk); | |
180 | if (!e_line) | |
525f7bb2 | 181 | return -ENOSPC; |
588726d3 | 182 | |
d624f371 | 183 | /* Erase blocks that are bad in this line but might not be in next */ |
26f76dce | 184 | if (unlikely(pblk_ppa_empty(*erase_ppa)) && |
d624f371 JG |
185 | bitmap_weight(d_line->blk_bitmap, lm->blk_per_line)) { |
186 | int bit = -1; | |
187 | ||
188 | retry: | |
189 | bit = find_next_bit(d_line->blk_bitmap, | |
190 | lm->blk_per_line, bit + 1); | |
191 | if (bit >= lm->blk_per_line) | |
525f7bb2 | 192 | return 0; |
a4bd217b | 193 | |
d624f371 JG |
194 | spin_lock(&e_line->lock); |
195 | if (test_bit(bit, e_line->erase_bitmap)) { | |
196 | spin_unlock(&e_line->lock); | |
197 | goto retry; | |
198 | } | |
199 | spin_unlock(&e_line->lock); | |
200 | ||
201 | set_bit(bit, e_line->erase_bitmap); | |
a44f53fa | 202 | atomic_dec(&e_line->left_eblks); |
d624f371 | 203 | *erase_ppa = pblk->luns[bit].bppa; /* set ch and lun */ |
69471513 | 204 | erase_ppa->a.blk = e_line->id; |
a4bd217b | 205 | } |
525f7bb2 HH |
206 | |
207 | return 0; | |
a4bd217b | 208 | } |