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
8 struct 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 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
21 * be called between disk_stat_lock() and disk_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((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
43 static 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), value,
49 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
82 #endif /* _LINUX_PART_STAT_H */
83
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