Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2018 Intel Corporation.
3 : * Copyright 2023 Solidigm All Rights Reserved
4 : * All rights reserved.
5 : */
6 :
7 : #ifndef FTL_BAND_H
8 : #define FTL_BAND_H
9 :
10 : #include "spdk/stdinc.h"
11 : #include "spdk/bit_array.h"
12 : #include "spdk/queue.h"
13 : #include "spdk/crc32.h"
14 :
15 : #include "ftl_io.h"
16 : #include "ftl_internal.h"
17 : #include "ftl_core.h"
18 :
19 : #include "utils/ftl_df.h"
20 :
21 : #define FTL_MAX_OPEN_BANDS FTL_LAYOUT_REGION_TYPE_P2L_COUNT
22 :
23 : #define FTL_BAND_VERSION_0 0
24 : #define FTL_BAND_VERSION_1 1
25 : #define FTL_BAND_VERSION_2 2
26 :
27 : #define FTL_BAND_VERSION_CURRENT FTL_BAND_VERSION_2
28 :
29 : struct spdk_ftl_dev;
30 : struct ftl_band;
31 : struct ftl_rq;
32 : struct ftl_basic_rq;
33 :
34 : enum ftl_band_state {
35 : FTL_BAND_STATE_FREE,
36 : FTL_BAND_STATE_PREP,
37 : FTL_BAND_STATE_OPENING,
38 : FTL_BAND_STATE_OPEN,
39 : FTL_BAND_STATE_FULL,
40 : FTL_BAND_STATE_CLOSING,
41 : FTL_BAND_STATE_CLOSED,
42 : FTL_BAND_STATE_MAX
43 : };
44 :
45 : typedef void (*ftl_band_state_change_fn)(struct ftl_band *band);
46 : typedef void (*ftl_band_ops_cb)(struct ftl_band *band, void *ctx, bool status);
47 : typedef void (*ftl_band_md_cb)(struct ftl_band *band, void *ctx, enum ftl_md_status status);
48 : typedef void (*ftl_band_validate_md_cb)(struct ftl_band *band, bool valid);
49 :
50 : struct ftl_band_md {
51 : /* Band metadata version */
52 : uint64_t version;
53 :
54 : /* Band iterator for writing */
55 : struct {
56 : /* Current physical address of the write pointer */
57 : ftl_addr addr;
58 :
59 : /* Offset from the band's start of the write pointer */
60 : uint64_t offset;
61 : } iter;
62 :
63 : /* Band's state */
64 : enum ftl_band_state state;
65 :
66 : /* Band type set during opening */
67 : enum ftl_band_type type;
68 :
69 : /* nv_cache p2l md region associated with band */
70 : enum ftl_layout_region_type p2l_md_region;
71 :
72 : /* Reserved */
73 : uint8_t reserved[4];
74 :
75 : /* Sequence ID when band was opened */
76 : uint64_t seq;
77 :
78 : /* Sequence ID when band was closed */
79 : uint64_t close_seq_id;
80 :
81 : /* Number of times band was fully written (ie. number of free -> closed state cycles) */
82 : uint64_t wr_cnt;
83 :
84 : /* Durable format object id for P2L map, allocated on shared memory */
85 : ftl_df_obj_id df_p2l_map;
86 :
87 : /* CRC32 checksum of the associated P2L map when band is in closed state */
88 : uint32_t p2l_map_checksum;
89 :
90 : /* Reserved */
91 : uint8_t reserved2[4020];
92 : } __attribute__((packed));
93 :
94 : SPDK_STATIC_ASSERT(sizeof(struct ftl_band_md) == FTL_BLOCK_SIZE, "Incorrect band metadata size");
95 : SPDK_STATIC_ASSERT(offsetof(struct ftl_band_md, version) == 0,
96 : "Incorrect band metadata version offset");
97 :
98 : struct ftl_band {
99 : /* Device this band belongs to */
100 : struct spdk_ftl_dev *dev;
101 :
102 : struct ftl_band_md *md;
103 :
104 : /* IO queue depth (outstanding IOs) */
105 : uint64_t queue_depth;
106 :
107 : /* Fields for owner of the band - compaction, or gc */
108 : struct {
109 : /* Callback context for the owner */
110 : void *priv;
111 :
112 : /* State change callback */
113 : ftl_band_state_change_fn state_change_fn;
114 :
115 : /* Callback for the owner */
116 : union {
117 : ftl_band_ops_cb ops_fn;
118 : ftl_band_md_cb md_fn;
119 : };
120 :
121 : /* Reference counter */
122 : uint64_t cnt;
123 : } owner;
124 :
125 : /* P2L map */
126 : struct ftl_p2l_map p2l_map;
127 :
128 : /* Band relocation is in progress */
129 : bool reloc;
130 :
131 : /* Band's index */
132 : uint32_t id;
133 :
134 : /* Band's NAND id - a group multiple bands may be part of the same physical band on base device
135 : * This way the write access pattern will match the actual physical layout more closely, leading
136 : * to lower overall write amplification factor
137 : */
138 : uint32_t phys_id;
139 :
140 : /* Band start addr */
141 : ftl_addr start_addr;
142 :
143 : /* End metadata start addr */
144 : ftl_addr tail_md_addr;
145 :
146 : /* Metadata request */
147 : struct ftl_basic_rq metadata_rq;
148 :
149 : /* Free/shut bands' lists
150 : * Open bands are kept and managed directly by the writer (either GC or compaction). Each writer only
151 : * needs to keep two bands (one currently written to, and a pre-assigned reserve band to make sure flow
152 : * of data is always ongoing as the current one is closing).
153 : */
154 : TAILQ_ENTRY(ftl_band) queue_entry;
155 :
156 : /* For writing metadata */
157 : struct ftl_md_io_entry_ctx md_persist_entry_ctx;
158 :
159 : /* Callback function for validate md */
160 : ftl_band_validate_md_cb validate_cb;
161 : };
162 :
163 :
164 : uint64_t ftl_band_block_offset_from_addr(struct ftl_band *band, ftl_addr addr);
165 : ftl_addr ftl_band_addr_from_block_offset(struct ftl_band *band, uint64_t block_off);
166 : void ftl_band_set_type(struct ftl_band *band, enum ftl_band_type type);
167 : void ftl_band_set_state(struct ftl_band *band, enum ftl_band_state state);
168 : const char *ftl_band_get_state_name(struct ftl_band *band);
169 : void ftl_band_acquire_p2l_map(struct ftl_band *band);
170 : int ftl_band_alloc_p2l_map(struct ftl_band *band);
171 : int ftl_band_open_p2l_map(struct ftl_band *band);
172 : void ftl_band_release_p2l_map(struct ftl_band *band);
173 : ftl_addr ftl_band_next_xfer_addr(struct ftl_band *band, ftl_addr addr, size_t num_blocks);
174 : ftl_addr ftl_band_next_addr(struct ftl_band *band, ftl_addr addr, size_t offset);
175 : size_t ftl_band_user_blocks_left(const struct ftl_band *band, size_t offset);
176 : size_t ftl_band_user_blocks(const struct ftl_band *band);
177 : void ftl_band_set_p2l(struct ftl_band *band, uint64_t lba, ftl_addr addr, uint64_t seq_id);
178 : void ftl_band_set_addr(struct ftl_band *band, uint64_t lba, ftl_addr addr);
179 : struct ftl_band *ftl_band_from_addr(struct spdk_ftl_dev *dev, ftl_addr addr);
180 : ftl_addr ftl_band_tail_md_addr(struct ftl_band *band);
181 : int ftl_band_filled(struct ftl_band *band, size_t offset);
182 : int ftl_band_write_prep(struct ftl_band *band);
183 : size_t ftl_p2l_map_pool_elem_size(struct spdk_ftl_dev *dev);
184 : struct ftl_band *ftl_band_search_next_to_reloc(struct spdk_ftl_dev *dev);
185 : void ftl_band_init_gc_iter(struct spdk_ftl_dev *dev);
186 : ftl_addr ftl_band_p2l_map_addr(struct ftl_band *band);
187 : void ftl_valid_map_load_state(struct spdk_ftl_dev *dev);
188 : int ftl_bands_load_state(struct spdk_ftl_dev *dev);
189 : void ftl_band_open(struct ftl_band *band, enum ftl_band_type type);
190 : void ftl_band_close(struct ftl_band *band);
191 : void ftl_band_free(struct ftl_band *band);
192 : void ftl_band_rq_write(struct ftl_band *band, struct ftl_rq *rq);
193 : void ftl_band_rq_read(struct ftl_band *band, struct ftl_rq *rq);
194 : void ftl_band_basic_rq_write(struct ftl_band *band, struct ftl_basic_rq *brq);
195 : void ftl_band_basic_rq_read(struct ftl_band *band, struct ftl_basic_rq *brq);
196 : void ftl_band_get_next_gc(struct spdk_ftl_dev *dev, ftl_band_ops_cb cb, void *cntx);
197 : void ftl_band_read_tail_brq_md(struct ftl_band *band, ftl_band_md_cb cb, void *cntx);
198 : void ftl_band_initialize_free_state(struct ftl_band *band);
199 : double ftl_band_invalidity(struct ftl_band *band);
200 :
201 : static inline void
202 0 : ftl_band_set_owner(struct ftl_band *band,
203 : ftl_band_state_change_fn fn,
204 : void *priv)
205 : {
206 0 : assert(NULL == band->owner.priv);
207 0 : assert(NULL == band->owner.state_change_fn);
208 :
209 0 : band->owner.state_change_fn = fn;
210 0 : band->owner.priv = priv;
211 0 : }
212 :
213 : static inline void
214 0 : ftl_band_clear_owner(struct ftl_band *band,
215 : ftl_band_state_change_fn fn,
216 : void *priv)
217 : {
218 0 : assert(priv == band->owner.priv);
219 0 : assert(fn == band->owner.state_change_fn);
220 :
221 0 : band->owner.state_change_fn = NULL;
222 0 : band->owner.priv = NULL;
223 0 : }
224 :
225 : static inline int
226 0 : ftl_band_empty(const struct ftl_band *band)
227 : {
228 0 : return band->p2l_map.num_valid == 0;
229 : }
230 :
231 : static inline uint64_t
232 0 : ftl_band_qd(const struct ftl_band *band)
233 : {
234 0 : return band->queue_depth;
235 : }
236 :
237 : static inline bool
238 0 : ftl_band_block_offset_valid(struct ftl_band *band, size_t block_off)
239 : {
240 0 : struct ftl_p2l_map *p2l_map = &band->p2l_map;
241 :
242 0 : return ftl_bitmap_get(p2l_map->valid, block_off);
243 0 : }
244 :
245 : static inline void
246 5 : ftl_band_iter_init(struct ftl_band *band)
247 : {
248 : /* Initialize band iterator to begin state */
249 5 : band->md->iter.addr = band->start_addr;
250 5 : band->md->iter.offset = 0;
251 5 : }
252 :
253 : static inline void
254 0 : ftl_band_iter_advance(struct ftl_band *band, uint64_t num_blocks)
255 : {
256 0 : band->md->iter.offset += num_blocks;
257 0 : band->md->iter.addr = ftl_band_next_xfer_addr(band, band->md->iter.addr, num_blocks);
258 0 : assert(band->md->iter.addr != FTL_ADDR_INVALID);
259 0 : }
260 :
261 : static inline void
262 5 : ftl_band_iter_set(struct ftl_band *band, uint64_t num_blocks)
263 : {
264 5 : band->md->iter.offset = num_blocks;
265 5 : band->md->iter.addr = ftl_band_next_xfer_addr(band, band->md->iter.addr, num_blocks);
266 5 : assert(band->md->iter.addr != FTL_ADDR_INVALID);
267 5 : }
268 :
269 : #endif /* FTL_BAND_H */
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