projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| dc4fa29f MS |
1 | /* |
| 2 | * Copyright (C) 2021 Red Hat, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * This file is released under the GPL. | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef DM_IO_TRACKER_H | |
| 8 | #define DM_IO_TRACKER_H | |
| 9 | ||
| 10 | #include <linux/jiffies.h> | |
| 11 | ||
| 12 | struct dm_io_tracker { | |
| 13 | spinlock_t lock; | |
| 14 | ||
| 15 | /* | |
| 16 | * Sectors of in-flight IO. | |
| 17 | */ | |
| 18 | sector_t in_flight; | |
| 19 | ||
| 20 | /* | |
| 21 | * The time, in jiffies, when this device became idle | |
| 22 | * (if it is indeed idle). | |
| 23 | */ | |
| 24 | unsigned long idle_time; | |
| 25 | unsigned long last_update_time; | |
| 26 | }; | |
| 27 | ||
| 28 | static inline void dm_iot_init(struct dm_io_tracker *iot) | |
| 29 | { | |
| 30 | spin_lock_init(&iot->lock); | |
| 31 | iot->in_flight = 0ul; | |
| 32 | iot->idle_time = 0ul; | |
| 33 | iot->last_update_time = jiffies; | |
| 34 | } | |
| 35 | ||
| 36 | static inline bool dm_iot_idle_for(struct dm_io_tracker *iot, unsigned long j) | |
| 37 | { | |
| 38 | bool r = false; | |
| 39 | ||
| 40 | spin_lock_irq(&iot->lock); | |
| 41 | if (!iot->in_flight) | |
| 42 | r = time_after(jiffies, iot->idle_time + j); | |
| 43 | spin_unlock_irq(&iot->lock); | |
| 44 | ||
| 45 | return r; | |
| 46 | } | |
| 47 | ||
| 5c0de3d7 MP |
48 | static inline unsigned long dm_iot_idle_time(struct dm_io_tracker *iot) |
| 49 | { | |
| 50 | unsigned long r = 0; | |
| 51 | ||
| 52 | spin_lock_irq(&iot->lock); | |
| 53 | if (!iot->in_flight) | |
| 54 | r = jiffies - iot->idle_time; | |
| 55 | spin_unlock_irq(&iot->lock); | |
| 56 | ||
| 57 | return r; | |
| 58 | } | |
| 59 | ||
| dc4fa29f MS |
60 | static inline void dm_iot_io_begin(struct dm_io_tracker *iot, sector_t len) |
| 61 | { | |
| 62 | spin_lock_irq(&iot->lock); | |
| 63 | iot->in_flight += len; | |
| 64 | spin_unlock_irq(&iot->lock); | |
| 65 | } | |
| 66 | ||
| 67 | static inline void dm_iot_io_end(struct dm_io_tracker *iot, sector_t len) | |
| 68 | { | |
| 69 | unsigned long flags; | |
| 70 | ||
| 71 | if (!len) | |
| 72 | return; | |
| 73 | ||
| 74 | spin_lock_irqsave(&iot->lock, flags); | |
| 75 | iot->in_flight -= len; | |
| 76 | if (!iot->in_flight) | |
| 77 | iot->idle_time = jiffies; | |
| 78 | spin_unlock_irqrestore(&iot->lock, flags); | |
| 79 | } | |
| 80 | ||
| 81 | #endif |