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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _LINUX_PART_STAT_H3#define _LINUX_PART_STAT_H4 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 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should21 * 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 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), 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