^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef __BLK_NULL_BLK_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define __BLK_NULL_BLK_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #undef pr_fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/blk-mq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/configfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/badblocks.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/fault-inject.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct nullb_cmd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct request *rq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) unsigned int tag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) blk_status_t error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct nullb_queue *nq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct hrtimer timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) bool fake_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct nullb_queue {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned long *tag_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) wait_queue_head_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned int queue_depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct nullb_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned int requeue_selection;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct nullb_cmd *cmds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct nullb_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct nullb *nullb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct config_item item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct radix_tree_root data; /* data stored in the disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct radix_tree_root cache; /* disk cache data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned long flags; /* device flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned int curr_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct badblocks badblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned int nr_zones;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) unsigned int nr_zones_imp_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) unsigned int nr_zones_exp_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned int nr_zones_closed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct blk_zone *zones;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) sector_t zone_size_sects;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) spinlock_t zone_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long *zone_locks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) unsigned long size; /* device size in MB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) unsigned long completion_nsec; /* time in ns to complete a request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned long cache_size; /* disk cache size in MB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) unsigned long zone_size; /* zone size in MB if device is zoned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) unsigned long zone_capacity; /* zone capacity in MB if device is zoned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unsigned int zone_nr_conv; /* number of conventional zones */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) unsigned int zone_max_open; /* max number of open zones */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) unsigned int zone_max_active; /* max number of active zones */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) unsigned int submit_queues; /* number of submission queues */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) unsigned int home_node; /* home node for the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned int queue_mode; /* block interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned int blocksize; /* block size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned int irqmode; /* IRQ completion handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) unsigned int hw_queue_depth; /* queue depth */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) unsigned int index; /* index of the disk, only valid with a disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) bool blocking; /* blocking blk-mq device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) bool use_per_node_hctx; /* use per-node allocation for hardware context */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) bool power; /* power on/off the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) bool memory_backed; /* if data is stored in memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) bool discard; /* if support discard */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) bool zoned; /* if device is zoned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct nullb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct nullb_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct request_queue *q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct gendisk *disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) struct blk_mq_tag_set *tag_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct blk_mq_tag_set __tag_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned int queue_depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) atomic_long_t cur_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct hrtimer bw_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) unsigned long cache_flush_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct nullb_queue *queues;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unsigned int nr_queues;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) char disk_name[DISK_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) blk_status_t null_process_cmd(struct nullb_cmd *cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) enum req_opf op, sector_t sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) unsigned int nr_sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #ifdef CONFIG_BLK_DEV_ZONED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int null_register_zoned_dev(struct nullb *nullb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) void null_free_zoned_dev(struct nullb_device *dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) int null_report_zones(struct gendisk *disk, sector_t sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) unsigned int nr_zones, report_zones_cb cb, void *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) enum req_opf op, sector_t sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) sector_t nr_sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) size_t null_zone_valid_read_len(struct nullb *nullb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) sector_t sector, unsigned int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static inline int null_init_zoned_dev(struct nullb_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct request_queue *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) pr_err("CONFIG_BLK_DEV_ZONED not enabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static inline int null_register_zoned_dev(struct nullb *nullb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static inline void null_free_zoned_dev(struct nullb_device *dev) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static inline blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) enum req_opf op, sector_t sector, sector_t nr_sectors)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return BLK_STS_NOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static inline size_t null_zone_valid_read_len(struct nullb *nullb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) sector_t sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #define null_report_zones NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #endif /* CONFIG_BLK_DEV_ZONED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #endif /* __NULL_BLK_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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