LXR linux/include/linux/part

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_PART_STAT_H
   3#define _LINUX_PART_STAT_H
   4
   5#include <linux/genhd.h>
   6
   7struct disk_stats {
   8        u64 nsecs[NR_STAT_GROUPS];
   9        unsigned long sectors[NR_STAT_GROUPS];
  10        unsigned long ios[NR_STAT_GROUPS];
  11        unsigned long merges[NR_STAT_GROUPS];
  12        unsigned long io_ticks;
  13        local_t in_flight[2];
  14};
  15
  16/*
  17 * Macros to operate on percpu disk statistics:
  18 *
  19 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
  20 * be called between disk_stat_lock() and disk_stat_unlock().
  21 *
  22 * part_stat_read() can be called at any time.
  23 */
  24#define part_stat_lock()        preempt_disable()
  25#define part_stat_unlock()      preempt_enable()
  26
  27#define part_stat_get_cpu(part, field, cpu)                             \
  28        (per_cpu_ptr((part)->dkstats, (cpu))->field)
  29
  30#define part_stat_get(part, field)                                      \
  31        part_stat_get_cpu(part, field, smp_processor_id())
  32
  33#define part_stat_read(part, field)                                     \
  34({                                                                      \
  35        typeof((part)->dkstats->field) res = 0;                         \
  36        unsigned int _cpu;                                              \
  37        for_each_possible_cpu(_cpu)                                     \
  38                res += per_cpu_ptr((part)->dkstats, _cpu)->field;       \
  39        res;                                                            \
  40})
  41
  42static inline void part_stat_set_all(struct hd_struct *part, int value)
  43{
  44        int i;
  45
  46        for_each_possible_cpu(i)
  47                memset(per_cpu_ptr(part->dkstats, i), value,
  48                                sizeof(struct disk_stats));
  49}
  50
  51#define part_stat_read_accum(part, field)                               \
  52        (part_stat_read(part, field[STAT_READ]) +                       \
  53         part_stat_read(part, field[STAT_WRITE]) +                      \
  54         part_stat_read(part, field[STAT_DISCARD]))
  55
  56#define __part_stat_add(part, field, addnd)                             \
  57        __this_cpu_add((part)->dkstats->field, addnd)
  58
  59#define part_stat_add(part, field, addnd)       do {                    \
  60        __part_stat_add((part), field, addnd);                          \
  61        if ((part)->partno)                                             \
  62                __part_stat_add(&part_to_disk((part))->part0,           \
  63                                field, addnd);                          \
  64} while (0)
  65
  66#define part_stat_dec(gendiskp, field)                                  \
  67        part_stat_add(gendiskp, field, -1)
  68#define part_stat_inc(gendiskp, field)                                  \
  69        part_stat_add(gendiskp, field, 1)
  70#define part_stat_sub(gendiskp, field, subnd)                           \
  71        part_stat_add(gendiskp, field, -subnd)
  72
  73#define part_stat_local_dec(gendiskp, field)                            \
  74        local_dec(&(part_stat_get(gendiskp, field)))
  75#define part_stat_local_inc(gendiskp, field)                            \
  76        local_inc(&(part_stat_get(gendiskp, field)))
  77#define part_stat_local_read(gendiskp, field)                           \
  78        local_read(&(part_stat_get(gendiskp, field)))
  79#define part_stat_local_read_cpu(gendiskp, field, cpu)                  \
  80        local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
  81
  82#endif /* _LINUX_PART_STAT_H */
  83