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authorThomas Gleixner2020-12-09 14:09:27 +0800
committerMarc Zyngier2021-04-07 16:33:20 +0100
commitb2c67cbe9f447312f5cdd7c6641b463f2349aec0 (patch)
tree3df86da966a25b85da7c84cb893edb2705ccd720 /include/linux/timekeeping.h
parenta8cf291bdac5d415eadb55e79df1fca8c3f0dfef (diff)
time: Add mechanism to recognize clocksource in time_get_snapshot
System time snapshots are not conveying information about the current clocksource which was used, but callers like the PTP KVM guest implementation have the requirement to evaluate the clocksource type to select the appropriate mechanism. Introduce a clocksource id field in struct clocksource which is by default set to CSID_GENERIC (0). Clocksource implementations can set that field to a value which allows to identify the clocksource. Store the clocksource id of the current clocksource in the system_time_snapshot so callers can evaluate which clocksource was used to take the snapshot and act accordingly. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Jianyong Wu <jianyong.wu@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20201209060932.212364-5-jianyong.wu@arm.com
Diffstat (limited to 'include/linux/timekeeping.h')
-rw-r--r--include/linux/timekeeping.h12
1 files changed, 7 insertions, 5 deletions
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index c6792cf01bc7..78a98bdff76d 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -3,6 +3,7 @@
#define _LINUX_TIMEKEEPING_H
#include <linux/errno.h>
+#include <linux/clocksource_ids.h>
/* Included from linux/ktime.h */
@@ -243,11 +244,12 @@ struct ktime_timestamps {
* @cs_was_changed_seq: The sequence number of clocksource change events
*/
struct system_time_snapshot {
- u64 cycles;
- ktime_t real;
- ktime_t raw;
- unsigned int clock_was_set_seq;
- u8 cs_was_changed_seq;
+ u64 cycles;
+ ktime_t real;
+ ktime_t raw;
+ enum clocksource_ids cs_id;
+ unsigned int clock_was_set_seq;
+ u8 cs_was_changed_seq;
};
/**