diff options
| author | Peter Hilber <peter.hilber@opensynergy.com> | 2024-02-01 02:04:47 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-07 17:05:21 +0100 |
| commit | 93630d6df7507fa4e664110b1878c06a0c00b0b9 (patch) | |
| tree | 5f32a87668f9c9e42fde685d8bf24f67d3f4f1d0 /include/linux/timekeeping.h | |
| parent | c55cbfcea6087cca1f7891a8d1ca52dcae946be5 (diff) | |
timekeeping: Add clocksource ID to struct system_counterval_t
Clocksource pointers can be problematic to obtain for drivers which are not
clocksource drivers themselves. In particular, the RFC virtio_rtc driver
[1] would require a new helper function to obtain a pointer to the ARM
Generic Timer clocksource. The ptp_kvm driver also required a similar
workaround.
Add a clocksource ID member to struct system_counterval_t, which in the
future shall identify the clocksource, and which shall replace the struct
clocksource * member. By this, get_device_system_crosststamp() callers
(such as virtio_rtc and ptp_kvm) will be able to supply easily accessible
clocksource ids instead of clocksource pointers.
[1] https://lore.kernel.org/lkml/20231218073849.35294-1-peter.hilber@opensynergy.com/
Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240201010453.2212371-3-peter.hilber@opensynergy.com
Diffstat (limited to 'include/linux/timekeeping.h')
| -rw-r--r-- | include/linux/timekeeping.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index 7c43e98cf211..ca234fa4cc04 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -273,10 +273,15 @@ struct system_device_crosststamp { * @cycles: System counter value * @cs: Clocksource corresponding to system counter value. Used by * timekeeping code to verify comparibility of two cycle values + * @cs_id: Clocksource ID corresponding to system counter value. To be + * used instead of cs in the future. + * The default ID, CSID_GENERIC, does not identify a specific + * clocksource. */ struct system_counterval_t { u64 cycles; struct clocksource *cs; + enum clocksource_ids cs_id; }; /* |