[PATCH v1 2/6] event/sw: support power monitor

[Sivaprasad Tummala <sivaprasad.tummala@amd.com>]

Currently sw eventdev pmd does not support ``rte_power_monitor`` api.
This patch adds support by adding monitor callback that is called
whenever we enter sleep state and need to check if it is time to
wake up.

Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala@amd.com>
---
 drivers/event/sw/sw_evdev.c        |  1 +
 drivers/event/sw/sw_evdev.h        |  2 ++
 drivers/event/sw/sw_evdev_worker.c | 27 +++++++++++++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/drivers/event/sw/sw_evdev.c b/drivers/event/sw/sw_evdev.c
index 6d1816b76d..99b3c0d92f 100644
--- a/drivers/event/sw/sw_evdev.c
+++ b/drivers/event/sw/sw_evdev.c
@@ -958,6 +958,7 @@ sw_probe(struct rte_vdev_device *vdev)
 			.port_link = sw_port_link,
 			.port_unlink = sw_port_unlink,
 			.port_unlinks_in_progress = sw_port_unlinks_in_progress,
+			.get_monitor_addr = sw_event_get_monitor_addr,
 
 			.eth_rx_adapter_caps_get = sw_eth_rx_adapter_caps_get,
 
diff --git a/drivers/event/sw/sw_evdev.h b/drivers/event/sw/sw_evdev.h
index c7b943a72b..26aa2fe283 100644
--- a/drivers/event/sw/sw_evdev.h
+++ b/drivers/event/sw/sw_evdev.h
@@ -312,6 +312,8 @@ int sw_xstats_reset(struct rte_eventdev *dev,
 		int16_t queue_port_id,
 		const uint64_t ids[],
 		uint32_t nb_ids);
+int sw_event_get_monitor_addr(void *port,
+		struct rte_power_monitor_cond *pmc);
 
 int test_sw_eventdev(void);
 
diff --git a/drivers/event/sw/sw_evdev_worker.c b/drivers/event/sw/sw_evdev_worker.c
index 063b919c7e..139c98cfe2 100644
--- a/drivers/event/sw/sw_evdev_worker.c
+++ b/drivers/event/sw/sw_evdev_worker.c
@@ -10,6 +10,33 @@
 
 #define PORT_ENQUEUE_MAX_BURST_SIZE 64
 
+static int
+sw_event_ring_monitor_callback(const uint64_t value,
+		const uint64_t arg[RTE_POWER_MONITOR_OPAQUE_SZ])
+{
+	/* Check if the head pointer has changed */
+	return value != arg[0];
+}
+
+int
+sw_event_get_monitor_addr(void *port, struct rte_power_monitor_cond *pmc)
+{
+	struct sw_port *p = (void *)port;
+	struct rte_event_ring *ev_ring = p->cq_worker_ring;
+	struct rte_ring *rng = &ev_ring->r;
+
+	/*
+	 * Monitor event ring producer tail since if
+	 * prod.tail moves there are events to dequeue
+	 */
+	pmc->addr = &rng->prod.tail;
+	pmc->size = sizeof(rng->prod.tail);
+	pmc->opaque[0] = rng->prod.tail;
+	pmc->fn = sw_event_ring_monitor_callback;
+
+	return 0;
+}
+
 static inline void
 sw_event_release(struct sw_port *p, uint8_t index)
 {
-- 
2.34.1