1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PART_STAT_H
3 #define _LINUX_PART_STAT_H
5 #include <linux/blkdev.h>
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;
18 * Macros to operate on percpu disk statistics:
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().
23 * part_stat_read() can be called at any time.
25 #define part_stat_lock() preempt_disable()
26 #define part_stat_unlock() preempt_enable()
28 #define part_stat_get_cpu(part, field, cpu) \
29 (per_cpu_ptr((part)->bd_stats, (cpu))->field)
31 #define part_stat_get(part, field) \
32 part_stat_get_cpu(part, field, smp_processor_id())
34 #define part_stat_read(part, field) \
36 typeof((part)->bd_stats->field) res = 0; \
38 for_each_possible_cpu(_cpu) \
39 res += per_cpu_ptr((part)->bd_stats, _cpu)->field; \
43 static inline void part_stat_set_all(struct block_device *part, int value)
47 for_each_possible_cpu(i)
48 memset(per_cpu_ptr(part->bd_stats, i), value,
49 sizeof(struct disk_stats));
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]))
57 #define __part_stat_add(part, field, addnd) \
58 __this_cpu_add((part)->bd_stats->field, addnd)
60 #define part_stat_add(part, field, addnd) do { \
61 __part_stat_add((part), field, addnd); \
62 if ((part)->bd_partno) \
63 __part_stat_add(bdev_whole(part), field, addnd); \
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)
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)))
82 #endif /* _LINUX_PART_STAT_H */