| 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
| 2 | * |
| 3 | * wrapper/timer.h |
| 4 | * |
| 5 | * wrapper around linux/timer.h. |
| 6 | * |
| 7 | * Copyright (C) 2016 Michael Jeanson <mjeanson@efficios.com> |
| 8 | */ |
| 9 | |
| 10 | #ifndef _LTTNG_WRAPPER_TIMER_H |
| 11 | #define _LTTNG_WRAPPER_TIMER_H |
| 12 | |
| 13 | #include <lttng/kernel-version.h> |
| 14 | #include <linux/timer.h> |
| 15 | |
| 16 | /* |
| 17 | * In the olden days, pinned timers were initialized normaly with init_timer() |
| 18 | * and then modified with mod_timer_pinned(). |
| 19 | * |
| 20 | * Then came kernel 4.8.0 and they had to be initilized as pinned with |
| 21 | * init_timer_pinned() and then modified as regular timers with mod_timer(). |
| 22 | * |
| 23 | * Then came kernel 4.15.0 with a new timer API where init_timer() is no more. |
| 24 | * It's replaced by timer_setup() where pinned is now part of timer flags. |
| 25 | */ |
| 26 | |
| 27 | |
| 28 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,15,0)) |
| 29 | |
| 30 | #define LTTNG_TIMER_PINNED TIMER_PINNED |
| 31 | #define LTTNG_TIMER_FUNC_ARG_TYPE struct timer_list * |
| 32 | |
| 33 | #define lttng_mod_timer_pinned(timer, expires) \ |
| 34 | mod_timer(timer, expires) |
| 35 | |
| 36 | #define lttng_from_timer(var, callback_timer, timer_fieldname) \ |
| 37 | from_timer(var, callback_timer, timer_fieldname) |
| 38 | |
| 39 | #define lttng_timer_setup(timer, callback, flags, unused) \ |
| 40 | timer_setup(timer, callback, flags) |
| 41 | |
| 42 | |
| 43 | #else /* LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,15,0) */ |
| 44 | |
| 45 | |
| 46 | # if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) \ |
| 47 | || LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,8,0)) |
| 48 | |
| 49 | #define lttng_init_timer_pinned(timer) \ |
| 50 | init_timer_pinned(timer) |
| 51 | |
| 52 | #define lttng_mod_timer_pinned(timer, expires) \ |
| 53 | mod_timer(timer, expires) |
| 54 | |
| 55 | # else /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */ |
| 56 | |
| 57 | #define lttng_init_timer_pinned(timer) \ |
| 58 | init_timer(timer) |
| 59 | |
| 60 | #define lttng_mod_timer_pinned(timer, expires) \ |
| 61 | mod_timer_pinned(timer, expires) |
| 62 | |
| 63 | # endif /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */ |
| 64 | |
| 65 | |
| 66 | #define LTTNG_TIMER_PINNED TIMER_PINNED |
| 67 | #define LTTNG_TIMER_FUNC_ARG_TYPE unsigned long |
| 68 | |
| 69 | /* timer_fieldname is unused prior to 4.15. */ |
| 70 | #define lttng_from_timer(var, timer_data, timer_fieldname) \ |
| 71 | ((typeof(var))timer_data) |
| 72 | |
| 73 | static inline void lttng_timer_setup(struct timer_list *timer, |
| 74 | void (*function)(LTTNG_TIMER_FUNC_ARG_TYPE), |
| 75 | unsigned int flags, void *data) |
| 76 | { |
| 77 | if (flags & LTTNG_TIMER_PINNED) |
| 78 | lttng_init_timer_pinned(timer); |
| 79 | else |
| 80 | init_timer(timer); |
| 81 | |
| 82 | timer->function = function; |
| 83 | timer->data = (unsigned long)data; |
| 84 | } |
| 85 | |
| 86 | #endif /* LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,15,0) */ |
| 87 | |
| 88 | #endif /* _LTTNG_WRAPPER_TIMER_H */ |