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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b2d76adbc0
Most architectures have fast path to access percpu for current cpu. The required preempt_disable() is provided by part_stat_lock(). [hch: rebased] Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PART_STAT_H
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#define _LINUX_PART_STAT_H
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#include <linux/genhd.h>
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struct disk_stats {
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u64 nsecs[NR_STAT_GROUPS];
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unsigned long sectors[NR_STAT_GROUPS];
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unsigned long ios[NR_STAT_GROUPS];
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unsigned long merges[NR_STAT_GROUPS];
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unsigned long io_ticks;
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local_t in_flight[2];
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};
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/*
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* Macros to operate on percpu disk statistics:
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*
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* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
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* be called between disk_stat_lock() and disk_stat_unlock().
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*
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* part_stat_read() can be called at any time.
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*/
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#define part_stat_lock() preempt_disable()
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#define part_stat_unlock() preempt_enable()
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#define part_stat_get_cpu(part, field, cpu) \
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(per_cpu_ptr((part)->dkstats, (cpu))->field)
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#define part_stat_get(part, field) \
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part_stat_get_cpu(part, field, smp_processor_id())
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#define part_stat_read(part, field) \
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({ \
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typeof((part)->dkstats->field) res = 0; \
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unsigned int _cpu; \
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for_each_possible_cpu(_cpu) \
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res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
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res; \
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})
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static inline void part_stat_set_all(struct hd_struct *part, int value)
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{
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int i;
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for_each_possible_cpu(i)
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memset(per_cpu_ptr(part->dkstats, i), value,
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sizeof(struct disk_stats));
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}
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#define part_stat_read_accum(part, field) \
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(part_stat_read(part, field[STAT_READ]) + \
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part_stat_read(part, field[STAT_WRITE]) + \
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part_stat_read(part, field[STAT_DISCARD]))
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#define __part_stat_add(part, field, addnd) \
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__this_cpu_add((part)->dkstats->field, addnd)
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#define part_stat_add(part, field, addnd) do { \
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__part_stat_add((part), field, addnd); \
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if ((part)->partno) \
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__part_stat_add(&part_to_disk((part))->part0, \
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field, addnd); \
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} while (0)
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#define part_stat_dec(gendiskp, field) \
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part_stat_add(gendiskp, field, -1)
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#define part_stat_inc(gendiskp, field) \
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part_stat_add(gendiskp, field, 1)
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#define part_stat_sub(gendiskp, field, subnd) \
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part_stat_add(gendiskp, field, -subnd)
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#define part_stat_local_dec(gendiskp, field) \
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local_dec(&(part_stat_get(gendiskp, field)))
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#define part_stat_local_inc(gendiskp, field) \
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local_inc(&(part_stat_get(gendiskp, field)))
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#define part_stat_local_read(gendiskp, field) \
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local_read(&(part_stat_get(gendiskp, field)))
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#define part_stat_local_read_cpu(gendiskp, field, cpu) \
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local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
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#endif /* _LINUX_PART_STAT_H */
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