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lib: sbi_timer: Add support for timer events

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Currently, the sbi_timer only supports timer events configured via
SBI calls. Introduce struct sbi_timer_event and related functions
to allow configuring timer events from any part of OpenSBI.

Signed-off-by: Anup Patel <anup.patel@oss.qualcomm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Link: https://lore.kernel.org/r/20260425104048.2335262-4-anup.patel@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2026-04-25 16:10:47 +05:30
committed by Anup Patel
parent 357fae4820
commit b7fa8a246c
4 changed files with 248 additions and 23 deletions
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include/sbi/sbi_timer.h
+62 -3
View File
@@ -10,7 +10,60 @@
#ifndef __SBI_TIMER_H__
#define __SBI_TIMER_H__
#include <sbi/sbi_types.h>
#include <sbi/sbi_list.h>
/** Timer event re-start details */
struct sbi_timer_event_restart {
/** Flag indicating whether event re-start is required */
bool required;
/** Next time stamp for event if re-start is required */
u64 next_event;
};
/** Timer event abstraction */
struct sbi_timer_event {
/** List head for per-HART event list (Internal) */
struct sbi_dlist head;
/** Hart on which the event is started / running (Internal) */
int hart_index;
/** Time stamp when the event expires (Internal) */
u64 time_stamp;
/**
* Event callback to be called upon expiry.
*
* If the callback wants to re-start the event then
* it must update the event re-start details.
*
* NOTE: This will be called with the per-HART timer
* event list lock held.
*/
void (*callback)(struct sbi_timer_event *ev,
struct sbi_timer_event_restart *restart);
/**
* Event cleanup to be called upon sbi_timer_exit()
*
* NOTE: This will be called with per-HART timer
* event list lock held.
*/
void (*cleanup)(struct sbi_timer_event *ev);
/** Event specific private data */
void *priv;
};
#define SBI_INIT_TIMER_EVENT(__ptr, __callback, __cleanup, __priv) \
do { \
SBI_INIT_LIST_HEAD(&(__ptr)->head); \
(__ptr)->hart_index = -1; \
(__ptr)->time_stamp = 0; \
(__ptr)->callback = (__callback); \
(__ptr)->cleanup = (__cleanup); \
(__ptr)->priv = (__priv); \
} while (0)
/** Timer hardware device */
struct sbi_timer_device {
@@ -86,8 +139,14 @@ void sbi_timer_set_delta(ulong delta);
void sbi_timer_set_delta_upper(ulong delta_upper);
#endif
/** Start timer event for current HART */
void sbi_timer_event_start(u64 next_event);
/** Start timer event on current HART */
void sbi_timer_event_start(struct sbi_timer_event *ev, u64 next_event);
/** Stop timer event on current HART */
void sbi_timer_event_stop(struct sbi_timer_event *ev);
/** Start supervisor timer event on current HART */
void sbi_timer_smode_event_start(u64 next_event);
/** Process timer event for current HART */
void sbi_timer_process(void);