[PATCH v2] event/cnxk: add get remaining ticks routine

[<pbhagavatula@marvell.com>]

From: Pavan Nikhilesh <pbhagavatula@marvell.com>

Add support to get the remaining ticks to expire for a
given event timer.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
 doc/guides/rel_notes/release_23_11.rst |  5 ++++
 drivers/event/cnxk/cnxk_tim_evdev.c    |  1 +
 drivers/event/cnxk/cnxk_tim_evdev.h    |  3 +++
 drivers/event/cnxk/cnxk_tim_worker.c   | 35 ++++++++++++++++++++++++++
 4 files changed, 44 insertions(+)

diff --git a/doc/guides/rel_notes/release_23_11.rst b/doc/guides/rel_notes/release_23_11.rst
index 4411bb32c1..072f7f6959 100644
--- a/doc/guides/rel_notes/release_23_11.rst
+++ b/doc/guides/rel_notes/release_23_11.rst
@@ -41,6 +41,11 @@ DPDK Release 23.11
 New Features
 ------------
 
+* **Updated Marvell cnxk eventdev driver.**
+
+  Added support to get the remaining ticks to expire for a
+  given event timer.
+
 .. This section should contain new features added in this release.
    Sample format:
 
diff --git a/drivers/event/cnxk/cnxk_tim_evdev.c b/drivers/event/cnxk/cnxk_tim_evdev.c
index 121480df15..6d59fdf909 100644
--- a/drivers/event/cnxk/cnxk_tim_evdev.c
+++ b/drivers/event/cnxk/cnxk_tim_evdev.c
@@ -392,6 +392,7 @@ cnxk_tim_caps_get(const struct rte_eventdev *evdev, uint64_t flags,
 	cnxk_tim_ops.start = cnxk_tim_ring_start;
 	cnxk_tim_ops.stop = cnxk_tim_ring_stop;
 	cnxk_tim_ops.get_info = cnxk_tim_ring_info_get;
+	cnxk_tim_ops.remaining_ticks_get = cnxk_tim_remaining_ticks_get;
 	sso_set_priv_mem_fn = priv_mem_fn;
 
 	if (dev->enable_stats) {
diff --git a/drivers/event/cnxk/cnxk_tim_evdev.h b/drivers/event/cnxk/cnxk_tim_evdev.h
index 3a0b036cb4..b91fcb3aca 100644
--- a/drivers/event/cnxk/cnxk_tim_evdev.h
+++ b/drivers/event/cnxk/cnxk_tim_evdev.h
@@ -320,6 +320,9 @@ cnxk_tim_timer_cancel_burst(const struct rte_event_timer_adapter *adptr,
 			    struct rte_event_timer **tim,
 			    const uint16_t nb_timers);
 
+int cnxk_tim_remaining_ticks_get(const struct rte_event_timer_adapter *adapter,
+				 const struct rte_event_timer *evtim, uint64_t *ticks_remaining);
+
 int cnxk_tim_caps_get(const struct rte_eventdev *dev, uint64_t flags,
 		      uint32_t *caps,
 		      const struct event_timer_adapter_ops **ops,
diff --git a/drivers/event/cnxk/cnxk_tim_worker.c b/drivers/event/cnxk/cnxk_tim_worker.c
index 923a72093b..d1dab0552f 100644
--- a/drivers/event/cnxk/cnxk_tim_worker.c
+++ b/drivers/event/cnxk/cnxk_tim_worker.c
@@ -171,3 +171,38 @@ cnxk_tim_timer_cancel_burst(const struct rte_event_timer_adapter *adptr,
 
 	return index;
 }
+
+int
+cnxk_tim_remaining_ticks_get(const struct rte_event_timer_adapter *adapter,
+			     const struct rte_event_timer *evtim, uint64_t *ticks_remaining)
+{
+	struct cnxk_tim_ring *tim_ring = adapter->data->adapter_priv;
+	struct cnxk_tim_bkt *bkt, *current_bkt;
+	struct cnxk_tim_ent *entry;
+	uint64_t bkt_cyc, bucket;
+	uint64_t sema;
+
+	if (evtim->impl_opaque[1] == 0 || evtim->impl_opaque[0] == 0)
+		return -ENOENT;
+
+	entry = (struct cnxk_tim_ent *)(uintptr_t)evtim->impl_opaque[0];
+	if (entry->wqe != evtim->ev.u64)
+		return -ENOENT;
+
+	if (evtim->state != RTE_EVENT_TIMER_ARMED)
+		return -ENOENT;
+
+	bkt = (struct cnxk_tim_bkt *)evtim->impl_opaque[1];
+	sema = __atomic_load_n(&bkt->w1, __ATOMIC_ACQUIRE);
+	if (cnxk_tim_bkt_get_hbt(sema) || !cnxk_tim_bkt_get_nent(sema))
+		return -ENOENT;
+
+	bkt_cyc = tim_ring->tick_fn(tim_ring->tbase) - tim_ring->ring_start_cyc;
+	bucket = rte_reciprocal_divide_u64(bkt_cyc, &tim_ring->fast_div);
+	current_bkt = &tim_ring->bkt[bucket];
+
+	*ticks_remaining = RTE_MAX(bkt, current_bkt) - RTE_MIN(bkt, current_bkt);
+	/* Assume that the current bucket is yet to expire */
+	*ticks_remaining += 1;
+	return 0;
+}
-- 
2.25.1