drivers/md/dm-zoned.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2017 Western Digital Corporation or its affiliates.
   4  *
   5  * This file is released under the GPL.
   6  */
   7
   8 #ifndef DM_ZONED_H
   9 #define DM_ZONED_H
  10
  11 #include <linux/types.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/device-mapper.h>
  14 #include <linux/dm-kcopyd.h>
  15 #include <linux/list.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/mutex.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/rwsem.h>
  20 #include <linux/rbtree.h>
  21 #include <linux/radix-tree.h>
  22 #include <linux/shrinker.h>
  23
  24 /*
  25  * dm-zoned creates block devices with 4KB blocks, always.
  26  */
  27 #define DMZ_BLOCK_SHIFT         12
  28 #define DMZ_BLOCK_SIZE          (1 << DMZ_BLOCK_SHIFT)
  29 #define DMZ_BLOCK_MASK          (DMZ_BLOCK_SIZE - 1)
  30
  31 #define DMZ_BLOCK_SHIFT_BITS    (DMZ_BLOCK_SHIFT + 3)
  32 #define DMZ_BLOCK_SIZE_BITS     (1 << DMZ_BLOCK_SHIFT_BITS)
  33 #define DMZ_BLOCK_MASK_BITS     (DMZ_BLOCK_SIZE_BITS - 1)
  34
  35 #define DMZ_BLOCK_SECTORS_SHIFT (DMZ_BLOCK_SHIFT - SECTOR_SHIFT)
  36 #define DMZ_BLOCK_SECTORS       (DMZ_BLOCK_SIZE >> SECTOR_SHIFT)
  37 #define DMZ_BLOCK_SECTORS_MASK  (DMZ_BLOCK_SECTORS - 1)
  38
  39 /*
  40  * 4KB block <-> 512B sector conversion.
  41  */
  42 #define dmz_blk2sect(b)         ((sector_t)(b) << DMZ_BLOCK_SECTORS_SHIFT)
  43 #define dmz_sect2blk(s)         ((sector_t)(s) >> DMZ_BLOCK_SECTORS_SHIFT)
  44
  45 #define dmz_bio_block(bio)      dmz_sect2blk((bio)->bi_iter.bi_sector)
  46 #define dmz_bio_blocks(bio)     dmz_sect2blk(bio_sectors(bio))
  47
  48 /*
  49  * Zoned block device information.
  50  */
  51 struct dmz_dev {
  52         struct block_device     *bdev;
  53
  54         char                    name[BDEVNAME_SIZE];
  55
  56         sector_t                capacity;
  57
  58         unsigned int            nr_zones;
  59
  60         unsigned int            flags;
  61
  62         sector_t                zone_nr_sectors;
  63         unsigned int            zone_nr_sectors_shift;
  64
  65         sector_t                zone_nr_blocks;
  66         sector_t                zone_nr_blocks_shift;
  67 };
  68
  69 #define dmz_bio_chunk(dev, bio) ((bio)->bi_iter.bi_sector >> \
  70                                  (dev)->zone_nr_sectors_shift)
  71 #define dmz_chunk_block(dev, b) ((b) & ((dev)->zone_nr_blocks - 1))
  72
  73 /* Device flags. */
  74 #define DMZ_BDEV_DYING          (1 << 0)
  75 #define DMZ_CHECK_BDEV          (2 << 0)
  76
  77 /*
  78  * Zone descriptor.
  79  */
  80 struct dm_zone {
  81         /* For listing the zone depending on its state */
  82         struct list_head        link;
  83
  84         /* Zone type and state */
  85         unsigned long           flags;
  86
  87         /* Zone activation reference count */
  88         atomic_t                refcount;
  89
  90         /* Zone write pointer block (relative to the zone start block) */
  91         unsigned int            wp_block;
  92
  93         /* Zone weight (number of valid blocks in the zone) */
  94         unsigned int            weight;
  95
  96         /* The chunk that the zone maps */
  97         unsigned int            chunk;
  98
  99         /*
 100          * For a sequential data zone, pointer to the random zone
 101          * used as a buffer for processing unaligned writes.
 102          * For a buffer zone, this points back to the data zone.
 103          */
 104         struct dm_zone          *bzone;
 105 };
 106
 107 /*
 108  * Zone flags.
 109  */
 110 enum {
 111         /* Zone write type */
 112         DMZ_RND,
 113         DMZ_SEQ,
 114
 115         /* Zone critical condition */
 116         DMZ_OFFLINE,
 117         DMZ_READ_ONLY,
 118
 119         /* How the zone is being used */
 120         DMZ_META,
 121         DMZ_DATA,
 122         DMZ_BUF,
 123
 124         /* Zone internal state */
 125         DMZ_RECLAIM,
 126         DMZ_SEQ_WRITE_ERR,
 127 };
 128
 129 /*
 130  * Zone data accessors.
 131  */
 132 #define dmz_is_rnd(z)           test_bit(DMZ_RND, &(z)->flags)
 133 #define dmz_is_seq(z)           test_bit(DMZ_SEQ, &(z)->flags)
 134 #define dmz_is_empty(z)         ((z)->wp_block == 0)
 135 #define dmz_is_offline(z)       test_bit(DMZ_OFFLINE, &(z)->flags)
 136 #define dmz_is_readonly(z)      test_bit(DMZ_READ_ONLY, &(z)->flags)
 137 #define dmz_in_reclaim(z)       test_bit(DMZ_RECLAIM, &(z)->flags)
 138 #define dmz_seq_write_err(z)    test_bit(DMZ_SEQ_WRITE_ERR, &(z)->flags)
 139
 140 #define dmz_is_meta(z)          test_bit(DMZ_META, &(z)->flags)
 141 #define dmz_is_buf(z)           test_bit(DMZ_BUF, &(z)->flags)
 142 #define dmz_is_data(z)          test_bit(DMZ_DATA, &(z)->flags)
 143
 144 #define dmz_weight(z)           ((z)->weight)
 145
 146 /*
 147  * Message functions.
 148  */
 149 #define dmz_dev_info(dev, format, args...)      \
 150         DMINFO("(%s): " format, (dev)->name, ## args)
 151
 152 #define dmz_dev_err(dev, format, args...)       \
 153         DMERR("(%s): " format, (dev)->name, ## args)
 154
 155 #define dmz_dev_warn(dev, format, args...)      \
 156         DMWARN("(%s): " format, (dev)->name, ## args)
 157
 158 #define dmz_dev_debug(dev, format, args...)     \
 159         DMDEBUG("(%s): " format, (dev)->name, ## args)
 160
 161 struct dmz_metadata;
 162 struct dmz_reclaim;
 163
 164 /*
 165  * Functions defined in dm-zoned-metadata.c
 166  */
 167 int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **zmd);
 168 void dmz_dtr_metadata(struct dmz_metadata *zmd);
 169 int dmz_resume_metadata(struct dmz_metadata *zmd);
 170
 171 void dmz_lock_map(struct dmz_metadata *zmd);
 172 void dmz_unlock_map(struct dmz_metadata *zmd);
 173 void dmz_lock_metadata(struct dmz_metadata *zmd);
 174 void dmz_unlock_metadata(struct dmz_metadata *zmd);
 175 void dmz_lock_flush(struct dmz_metadata *zmd);
 176 void dmz_unlock_flush(struct dmz_metadata *zmd);
 177 int dmz_flush_metadata(struct dmz_metadata *zmd);
 178
 179 unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone);
 180 sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone);
 181 sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone);
 182 unsigned int dmz_nr_chunks(struct dmz_metadata *zmd);
 183
 184 #define DMZ_ALLOC_RND           0x01
 185 #define DMZ_ALLOC_RECLAIM       0x02
 186
 187 struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags);
 188 void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
 189
 190 void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone,
 191                   unsigned int chunk);
 192 void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
 193 unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd);
 194 unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd);
 195
 196 /*
 197  * Activate a zone (increment its reference count).
 198  */
 199 static inline void dmz_activate_zone(struct dm_zone *zone)
 200 {
 201         atomic_inc(&zone->refcount);
 202 }
 203
 204 /*
 205  * Deactivate a zone. This decrement the zone reference counter
 206  * indicating that all BIOs to the zone have completed when the count is 0.
 207  */
 208 static inline void dmz_deactivate_zone(struct dm_zone *zone)
 209 {
 210         atomic_dec(&zone->refcount);
 211 }
 212
 213 /*
 214  * Test if a zone is active, that is, has a refcount > 0.
 215  */
 216 static inline bool dmz_is_active(struct dm_zone *zone)
 217 {
 218         return atomic_read(&zone->refcount);
 219 }
 220
 221 int dmz_lock_zone_reclaim(struct dm_zone *zone);
 222 void dmz_unlock_zone_reclaim(struct dm_zone *zone);
 223 struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd);
 224
 225 struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd,
 226                                       unsigned int chunk, int op);
 227 void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *zone);
 228 struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
 229                                      struct dm_zone *dzone);
 230
 231 int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
 232                         sector_t chunk_block, unsigned int nr_blocks);
 233 int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
 234                           sector_t chunk_block, unsigned int nr_blocks);
 235 int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone,
 236                     sector_t chunk_block);
 237 int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone,
 238                           sector_t *chunk_block);
 239 int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
 240                           struct dm_zone *to_zone);
 241 int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
 242                            struct dm_zone *to_zone, sector_t chunk_block);
 243
 244 /*
 245  * Functions defined in dm-zoned-reclaim.c
 246  */
 247 int dmz_ctr_reclaim(struct dmz_dev *dev, struct dmz_metadata *zmd,
 248                     struct dmz_reclaim **zrc);
 249 void dmz_dtr_reclaim(struct dmz_reclaim *zrc);
 250 void dmz_suspend_reclaim(struct dmz_reclaim *zrc);
 251 void dmz_resume_reclaim(struct dmz_reclaim *zrc);
 252 void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc);
 253 void dmz_schedule_reclaim(struct dmz_reclaim *zrc);
 254
 255 /*
 256  * Functions defined in dm-zoned-target.c
 257  */
 258 bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev);
 259 bool dmz_check_bdev(struct dmz_dev *dmz_dev);
 260
 261 #endif /* DM_ZONED_H */