wifi: cfg80211: add an hrtimer based delayed work item

The normal timer mechanism assume that timeout further in the future
need a lower accuracy. As an example, the granularity for a timer
scheduled 4096 ms in the future on a 1000 Hz system is already 512 ms.
This granularity is perfectly sufficient for e.g. timeouts, but there
are other types of events that will happen at a future point in time and
require a higher accuracy.

Add a new wiphy_hrtimer_work type that uses an hrtimer internally. The
API is almost identical to the existing wiphy_delayed_work and it can be
used as a drop-in replacement after minor adjustments. The work will be
scheduled relative to the current time with a slack of 1 millisecond.

CC: stable@vger.kernel.org # 6.4+
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20251028125710.7f13a2adc5eb.I01b5af0363869864b0580d9c2a1770bafab69566@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 77 insertions, 0 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 797f9f2004a6..54a34d8d356e 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -1787,6 +1787,62 @@ bool wiphy_delayed_work_pending(struct wiphy *wiphy,
 }
 EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending);
 
+enum hrtimer_restart wiphy_hrtimer_work_timer(struct hrtimer *t)
+{
+	struct wiphy_hrtimer_work *hrwork =
+		container_of(t, struct wiphy_hrtimer_work, timer);
+
+	wiphy_work_queue(hrwork->wiphy, &hrwork->work);
+
+	return HRTIMER_NORESTART;
+}
+EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_timer);
+
+void wiphy_hrtimer_work_queue(struct wiphy *wiphy,
+			      struct wiphy_hrtimer_work *hrwork,
+			      ktime_t delay)
+{
+	trace_wiphy_hrtimer_work_queue(wiphy, &hrwork->work, delay);
+
+	if (!delay) {
+		hrtimer_cancel(&hrwork->timer);
+		wiphy_work_queue(wiphy, &hrwork->work);
+		return;
+	}
+
+	hrwork->wiphy = wiphy;
+	hrtimer_start_range_ns(&hrwork->timer, delay,
+			       1000 * NSEC_PER_USEC, HRTIMER_MODE_REL);
+}
+EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_queue);
+
+void wiphy_hrtimer_work_cancel(struct wiphy *wiphy,
+			       struct wiphy_hrtimer_work *hrwork)
+{
+	lockdep_assert_held(&wiphy->mtx);
+
+	hrtimer_cancel(&hrwork->timer);
+	wiphy_work_cancel(wiphy, &hrwork->work);
+}
+EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_cancel);
+
+void wiphy_hrtimer_work_flush(struct wiphy *wiphy,
+			      struct wiphy_hrtimer_work *hrwork)
+{
+	lockdep_assert_held(&wiphy->mtx);
+
+	hrtimer_cancel(&hrwork->timer);
+	wiphy_work_flush(wiphy, &hrwork->work);
+}
+EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_flush);
+
+bool wiphy_hrtimer_work_pending(struct wiphy *wiphy,
+				struct wiphy_hrtimer_work *hrwork)
+{
+	return hrtimer_is_queued(&hrwork->timer);
+}
+EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_pending);
+
 static int __init cfg80211_init(void)
 {
 	int err;
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 8a4c34112eb5..2b71f1d867a0 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -304,6 +304,27 @@ TRACE_EVENT(wiphy_delayed_work_queue,
 		  __entry->delay)
 );
 
+TRACE_EVENT(wiphy_hrtimer_work_queue,
+	TP_PROTO(struct wiphy *wiphy, struct wiphy_work *work,
+		 ktime_t delay),
+	TP_ARGS(wiphy, work, delay),
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		__field(void *, instance)
+		__field(void *, func)
+		__field(ktime_t, delay)
+	),
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		__entry->instance = work;
+		__entry->func = work->func;
+		__entry->delay = delay;
+	),
+	TP_printk(WIPHY_PR_FMT " instance=%p func=%pS delay=%llu",
+		  WIPHY_PR_ARG, __entry->instance, __entry->func,
+		  __entry->delay)
+);
+
 TRACE_EVENT(wiphy_work_worker_start,
 	TP_PROTO(struct wiphy *wiphy),
 	TP_ARGS(wiphy),