/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_PART_STAT_H #define _LINUX_PART_STAT_H #include <linux/genhd.h> struct disk_stats { u64 nsecs[NR_STAT_GROUPS]; unsigned long sectors[NR_STAT_GROUPS]; unsigned long ios[NR_STAT_GROUPS]; unsigned long merges[NR_STAT_GROUPS]; unsigned long io_ticks; local_t in_flight[2]; }; /* * Macros to operate on percpu disk statistics: * * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should * be called between disk_stat_lock() and disk_stat_unlock(). * * part_stat_read() can be called at any time. */ #define part_stat_lock() preempt_disable() #define part_stat_unlock() preempt_enable() #define part_stat_get_cpu(part, field, cpu) \ (per_cpu_ptr((part)->bd_stats, (cpu))->field) #define part_stat_get(part, field) \ part_stat_get_cpu(part, field, smp_processor_id()) #define part_stat_read(part, field) \ ({ \ typeof((part)->bd_stats->field) res = 0; \ unsigned int _cpu; \ for_each_possible_cpu(_cpu) \ res += per_cpu_ptr((part)->bd_stats, _cpu)->field; \ res; \ }) static inline void part_stat_set_all(struct block_device *part, int value) { int i; for_each_possible_cpu(i) memset(per_cpu_ptr(part->bd_stats, i), value, sizeof(struct disk_stats)); } #define part_stat_read_accum(part, field) \ (part_stat_read(part, field[STAT_READ]) + \ part_stat_read(part, field[STAT_WRITE]) + \ part_stat_read(part, field[STAT_DISCARD])) #define __part_stat_add(part, field, addnd) \ __this_cpu_add((part)->bd_stats->field, addnd) #define part_stat_add(part, field, addnd) do { \ __part_stat_add((part), field, addnd); \ if ((part)->bd_partno) \ __part_stat_add(bdev_whole(part), field, addnd); \ } while (0) #define part_stat_dec(part, field) \ part_stat_add(part, field, -1) #define part_stat_inc(part, field) \ part_stat_add(part, field, 1) #define part_stat_sub(part, field, subnd) \ part_stat_add(part, field, -subnd) #define part_stat_local_dec(part, field) \ local_dec(&(part_stat_get(part, field))) #define part_stat_local_inc(part, field) \ local_inc(&(part_stat_get(part, field))) #define part_stat_local_read(part, field) \ local_read(&(part_stat_get(part, field))) #define part_stat_local_read_cpu(part, field, cpu) \ local_read(&(part_stat_get_cpu(part, field, cpu))) #endif /* _LINUX_PART_STAT_H */