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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-cache.c - pblk's write cache | |
17 | */ | |
18 | ||
19 | #include "pblk.h" | |
20 | ||
21 | int pblk_write_to_cache(struct pblk *pblk, struct bio *bio, unsigned long flags) | |
22 | { | |
998ba629 | 23 | struct request_queue *q = pblk->dev->q; |
a4bd217b JG |
24 | struct pblk_w_ctx w_ctx; |
25 | sector_t lba = pblk_get_lba(bio); | |
998ba629 | 26 | unsigned long start_time = jiffies; |
a4bd217b JG |
27 | unsigned int bpos, pos; |
28 | int nr_entries = pblk_get_secs(bio); | |
29 | int i, ret; | |
30 | ||
ddcf35d3 MC |
31 | generic_start_io_acct(q, REQ_OP_WRITE, bio_sectors(bio), |
32 | &pblk->disk->part0); | |
998ba629 | 33 | |
a4bd217b JG |
34 | /* Update the write buffer head (mem) with the entries that we can |
35 | * write. The write in itself cannot fail, so there is no need to | |
36 | * rollback from here on. | |
37 | */ | |
38 | retry: | |
39 | ret = pblk_rb_may_write_user(&pblk->rwb, bio, nr_entries, &bpos); | |
588726d3 JG |
40 | switch (ret) { |
41 | case NVM_IO_REQUEUE: | |
a4bd217b JG |
42 | io_schedule(); |
43 | goto retry; | |
588726d3 JG |
44 | case NVM_IO_ERR: |
45 | pblk_pipeline_stop(pblk); | |
46 | goto out; | |
a4bd217b JG |
47 | } |
48 | ||
a4bd217b | 49 | pblk_ppa_set_empty(&w_ctx.ppa); |
6ca2f71f | 50 | w_ctx.flags = flags; |
cc9c9a00 | 51 | if (bio->bi_opf & REQ_PREFLUSH) { |
6ca2f71f | 52 | w_ctx.flags |= PBLK_FLUSH_ENTRY; |
cc9c9a00 HH |
53 | pblk_write_kick(pblk); |
54 | } | |
55 | ||
56 | if (unlikely(!bio_has_data(bio))) | |
57 | goto out; | |
a4bd217b JG |
58 | |
59 | for (i = 0; i < nr_entries; i++) { | |
60 | void *data = bio_data(bio); | |
61 | ||
62 | w_ctx.lba = lba + i; | |
63 | ||
64 | pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + i); | |
65 | pblk_rb_write_entry_user(&pblk->rwb, data, w_ctx, pos); | |
66 | ||
67 | bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE); | |
68 | } | |
69 | ||
76758390 HH |
70 | atomic64_add(nr_entries, &pblk->user_wa); |
71 | ||
880eda54 | 72 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
73 | atomic_long_add(nr_entries, &pblk->inflight_writes); |
74 | atomic_long_add(nr_entries, &pblk->req_writes); | |
75 | #endif | |
76 | ||
588726d3 JG |
77 | pblk_rl_inserted(&pblk->rl, nr_entries); |
78 | ||
a4bd217b | 79 | out: |
ddcf35d3 | 80 | generic_end_io_acct(q, REQ_OP_WRITE, &pblk->disk->part0, start_time); |
a4bd217b JG |
81 | pblk_write_should_kick(pblk); |
82 | return ret; | |
83 | } | |
84 | ||
85 | /* | |
86 | * On GC the incoming lbas are not necessarily sequential. Also, some of the | |
87 | * lbas might not be valid entries, which are marked as empty by the GC thread | |
88 | */ | |
d340121e | 89 | int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq) |
a4bd217b JG |
90 | { |
91 | struct pblk_w_ctx w_ctx; | |
92 | unsigned int bpos, pos; | |
d340121e | 93 | void *data = gc_rq->data; |
a4bd217b JG |
94 | int i, valid_entries; |
95 | ||
96 | /* Update the write buffer head (mem) with the entries that we can | |
97 | * write. The write in itself cannot fail, so there is no need to | |
98 | * rollback from here on. | |
99 | */ | |
100 | retry: | |
d340121e | 101 | if (!pblk_rb_may_write_gc(&pblk->rwb, gc_rq->secs_to_gc, &bpos)) { |
a4bd217b JG |
102 | io_schedule(); |
103 | goto retry; | |
104 | } | |
105 | ||
d340121e | 106 | w_ctx.flags = PBLK_IOTYPE_GC; |
a4bd217b JG |
107 | pblk_ppa_set_empty(&w_ctx.ppa); |
108 | ||
d340121e JG |
109 | for (i = 0, valid_entries = 0; i < gc_rq->nr_secs; i++) { |
110 | if (gc_rq->lba_list[i] == ADDR_EMPTY) | |
a4bd217b JG |
111 | continue; |
112 | ||
d340121e | 113 | w_ctx.lba = gc_rq->lba_list[i]; |
a4bd217b JG |
114 | |
115 | pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + valid_entries); | |
d340121e JG |
116 | pblk_rb_write_entry_gc(&pblk->rwb, data, w_ctx, gc_rq->line, |
117 | gc_rq->paddr_list[i], pos); | |
a4bd217b JG |
118 | |
119 | data += PBLK_EXPOSED_PAGE_SIZE; | |
120 | valid_entries++; | |
121 | } | |
122 | ||
d340121e | 123 | WARN_ONCE(gc_rq->secs_to_gc != valid_entries, |
a4bd217b JG |
124 | "pblk: inconsistent GC write\n"); |
125 | ||
76758390 HH |
126 | atomic64_add(valid_entries, &pblk->gc_wa); |
127 | ||
880eda54 | 128 | #ifdef CONFIG_NVM_PBLK_DEBUG |
a4bd217b JG |
129 | atomic_long_add(valid_entries, &pblk->inflight_writes); |
130 | atomic_long_add(valid_entries, &pblk->recov_gc_writes); | |
131 | #endif | |
132 | ||
133 | pblk_write_should_kick(pblk); | |
134 | return NVM_IO_OK; | |
135 | } |