1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_PART_STAT_H
3#define _LINUX_PART_STAT_H
4
5#include <linux/blkdev.h>
6#include <asm/local.h>
7
8struct disk_stats {
9 u64 nsecs[NR_STAT_GROUPS];
10 unsigned long sectors[NR_STAT_GROUPS];
11 unsigned long ios[NR_STAT_GROUPS];
12 unsigned long merges[NR_STAT_GROUPS];
13 unsigned long io_ticks;
14 local_t in_flight[2];
15};
16
17/*
18 * Macros to operate on percpu disk statistics:
19 *
20 * part_stat_{add|sub|inc|dec}() modify the stat counters and should
21 * be called between part_stat_lock() and part_stat_unlock().
22 *
23 * part_stat_read() can be called at any time.
24 */
25#define part_stat_lock() preempt_disable()
26#define part_stat_unlock() preempt_enable()
27
28#define part_stat_get_cpu(part, field, cpu) \
29 (per_cpu_ptr((part)->bd_stats, (cpu))->field)
30
31#define part_stat_get(part, field) \
32 part_stat_get_cpu(part, field, smp_processor_id())
33
34#define part_stat_read(part, field) \
35({ \
36 TYPEOF_UNQUAL((part)->bd_stats->field) res = 0; \
37 unsigned int _cpu; \
38 for_each_possible_cpu(_cpu) \
39 res += per_cpu_ptr((part)->bd_stats, _cpu)->field; \
40 res; \
41})
42
43static inline void part_stat_set_all(struct block_device *part, int value)
44{
45 int i;
46
47 for_each_possible_cpu(i)
48 memset(per_cpu_ptr(part->bd_stats, i), c: value,
49 n: sizeof(struct disk_stats));
50}
51
52#define part_stat_read_accum(part, field) \
53 (part_stat_read(part, field[STAT_READ]) + \
54 part_stat_read(part, field[STAT_WRITE]) + \
55 part_stat_read(part, field[STAT_DISCARD]))
56
57#define __part_stat_add(part, field, addnd) \
58 __this_cpu_add((part)->bd_stats->field, addnd)
59
60#define part_stat_add(part, field, addnd) do { \
61 __part_stat_add((part), field, addnd); \
62 if (bdev_is_partition(part)) \
63 __part_stat_add(bdev_whole(part), field, addnd); \
64} while (0)
65
66#define part_stat_dec(part, field) \
67 part_stat_add(part, field, -1)
68#define part_stat_inc(part, field) \
69 part_stat_add(part, field, 1)
70#define part_stat_sub(part, field, subnd) \
71 part_stat_add(part, field, -subnd)
72
73#define part_stat_local_dec(part, field) \
74 local_dec(&(part_stat_get(part, field)))
75#define part_stat_local_inc(part, field) \
76 local_inc(&(part_stat_get(part, field)))
77#define part_stat_local_read(part, field) \
78 local_read(&(part_stat_get(part, field)))
79#define part_stat_local_read_cpu(part, field, cpu) \
80 local_read(&(part_stat_get_cpu(part, field, cpu)))
81
82unsigned int bdev_count_inflight(struct block_device *part);
83
84#endif /* _LINUX_PART_STAT_H */
85