1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _LINUX_PART_STAT_H
3*4882a593Smuzhiyun #define _LINUX_PART_STAT_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/genhd.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun struct disk_stats {
8*4882a593Smuzhiyun u64 nsecs[NR_STAT_GROUPS];
9*4882a593Smuzhiyun unsigned long sectors[NR_STAT_GROUPS];
10*4882a593Smuzhiyun unsigned long ios[NR_STAT_GROUPS];
11*4882a593Smuzhiyun unsigned long merges[NR_STAT_GROUPS];
12*4882a593Smuzhiyun unsigned long io_ticks;
13*4882a593Smuzhiyun local_t in_flight[2];
14*4882a593Smuzhiyun };
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /*
17*4882a593Smuzhiyun * Macros to operate on percpu disk statistics:
18*4882a593Smuzhiyun *
19*4882a593Smuzhiyun * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
20*4882a593Smuzhiyun * be called between disk_stat_lock() and disk_stat_unlock().
21*4882a593Smuzhiyun *
22*4882a593Smuzhiyun * part_stat_read() can be called at any time.
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun #define part_stat_lock() preempt_disable()
25*4882a593Smuzhiyun #define part_stat_unlock() preempt_enable()
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define part_stat_get_cpu(part, field, cpu) \
28*4882a593Smuzhiyun (per_cpu_ptr((part)->dkstats, (cpu))->field)
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #define part_stat_get(part, field) \
31*4882a593Smuzhiyun part_stat_get_cpu(part, field, smp_processor_id())
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #define part_stat_read(part, field) \
34*4882a593Smuzhiyun ({ \
35*4882a593Smuzhiyun typeof((part)->dkstats->field) res = 0; \
36*4882a593Smuzhiyun unsigned int _cpu; \
37*4882a593Smuzhiyun for_each_possible_cpu(_cpu) \
38*4882a593Smuzhiyun res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
39*4882a593Smuzhiyun res; \
40*4882a593Smuzhiyun })
41*4882a593Smuzhiyun
part_stat_set_all(struct hd_struct * part,int value)42*4882a593Smuzhiyun static inline void part_stat_set_all(struct hd_struct *part, int value)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun int i;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun for_each_possible_cpu(i)
47*4882a593Smuzhiyun memset(per_cpu_ptr(part->dkstats, i), value,
48*4882a593Smuzhiyun sizeof(struct disk_stats));
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun #define part_stat_read_accum(part, field) \
52*4882a593Smuzhiyun (part_stat_read(part, field[STAT_READ]) + \
53*4882a593Smuzhiyun part_stat_read(part, field[STAT_WRITE]) + \
54*4882a593Smuzhiyun part_stat_read(part, field[STAT_DISCARD]))
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun #define __part_stat_add(part, field, addnd) \
57*4882a593Smuzhiyun __this_cpu_add((part)->dkstats->field, addnd)
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun #define part_stat_add(part, field, addnd) do { \
60*4882a593Smuzhiyun __part_stat_add((part), field, addnd); \
61*4882a593Smuzhiyun if ((part)->partno) \
62*4882a593Smuzhiyun __part_stat_add(&part_to_disk((part))->part0, \
63*4882a593Smuzhiyun field, addnd); \
64*4882a593Smuzhiyun } while (0)
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #define part_stat_dec(gendiskp, field) \
67*4882a593Smuzhiyun part_stat_add(gendiskp, field, -1)
68*4882a593Smuzhiyun #define part_stat_inc(gendiskp, field) \
69*4882a593Smuzhiyun part_stat_add(gendiskp, field, 1)
70*4882a593Smuzhiyun #define part_stat_sub(gendiskp, field, subnd) \
71*4882a593Smuzhiyun part_stat_add(gendiskp, field, -subnd)
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun #define part_stat_local_dec(gendiskp, field) \
74*4882a593Smuzhiyun local_dec(&(part_stat_get(gendiskp, field)))
75*4882a593Smuzhiyun #define part_stat_local_inc(gendiskp, field) \
76*4882a593Smuzhiyun local_inc(&(part_stat_get(gendiskp, field)))
77*4882a593Smuzhiyun #define part_stat_local_read(gendiskp, field) \
78*4882a593Smuzhiyun local_read(&(part_stat_get(gendiskp, field)))
79*4882a593Smuzhiyun #define part_stat_local_read_cpu(gendiskp, field, cpu) \
80*4882a593Smuzhiyun local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun #endif /* _LINUX_PART_STAT_H */
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