[PATCH RFC net-next 12/13] ice: dpll: Enable reference count tracking

[Ivan Vecera]

Update the Intel ICE driver to utilize the DPLL reference count tracking
infrastructure.

Add .dpll_tracker fields to the internal struct ice_dpll and struct
ice_dpll_pin structures.

Pass pointers to these trackers to the dpll_device_get/put() and
dpll_pin_get/put() functions, replacing the temporary NULL values.

This enables developers to trace reference ownership for the ICE driver's
DPLL resources via the ref_tracker debugfs interface when
CONFIG_DPLL_REFCNT_TRACKER is enabled.

Signed-off-by: Ivan Vecera <ivecera@xxxxxxxxxx>
---
 drivers/net/ethernet/intel/ice/ice_dpll.c | 16 +++++++++-------
 drivers/net/ethernet/intel/ice/ice_dpll.h |  4 ++++
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_dpll.c b/drivers/net/ethernet/intel/ice/ice_dpll.c
index 39cf26987b35c..ff1b597051e8f 100644
--- a/drivers/net/ethernet/intel/ice/ice_dpll.c
+++ b/drivers/net/ethernet/intel/ice/ice_dpll.c
@@ -2814,7 +2814,7 @@ static void ice_dpll_release_pins(struct ice_dpll_pin *pins, int count)
 	int i;
 
 	for (i = 0; i < count; i++)
-		dpll_pin_put(pins[i].pin, NULL);
+		dpll_pin_put(pins[i].pin, &pins[i].tracker);
 }
 
 /**
@@ -2840,7 +2840,8 @@ ice_dpll_get_pins(struct ice_pf *pf, struct ice_dpll_pin *pins,
 
 	for (i = 0; i < count; i++) {
 		pins[i].pin = dpll_pin_get(clock_id, i + start_idx, THIS_MODULE,
-					   &pins[i].prop, NULL, NULL);
+					   &pins[i].prop, NULL,
+					   &pins[i].tracker);
 		if (IS_ERR(pins[i].pin)) {
 			ret = PTR_ERR(pins[i].pin);
 			goto release_pins;
@@ -2851,7 +2852,7 @@ ice_dpll_get_pins(struct ice_pf *pf, struct ice_dpll_pin *pins,
 
 release_pins:
 	while (--i >= 0)
-		dpll_pin_put(pins[i].pin, NULL);
+		dpll_pin_put(pins[i].pin, &pins[i].tracker);
 	return ret;
 }
 
@@ -3037,7 +3038,7 @@ static void ice_dpll_deinit_rclk_pin(struct ice_pf *pf)
 	if (WARN_ON_ONCE(!vsi || !vsi->netdev))
 		return;
 	dpll_netdev_pin_clear(vsi->netdev);
-	dpll_pin_put(rclk->pin, NULL);
+	dpll_pin_put(rclk->pin, &rclk->tracker);
 }
 
 /**
@@ -3247,7 +3248,7 @@ ice_dpll_deinit_dpll(struct ice_pf *pf, struct ice_dpll *d, bool cgu)
 {
 	if (cgu)
 		dpll_device_unregister(d->dpll, d->ops, d);
-	dpll_device_put(d->dpll, NULL);
+	dpll_device_put(d->dpll, &d->tracker);
 }
 
 /**
@@ -3271,7 +3272,8 @@ ice_dpll_init_dpll(struct ice_pf *pf, struct ice_dpll *d, bool cgu,
 	u64 clock_id = pf->dplls.clock_id;
 	int ret;
 
-	d->dpll = dpll_device_get(clock_id, d->dpll_idx, THIS_MODULE, NULL);
+	d->dpll = dpll_device_get(clock_id, d->dpll_idx, THIS_MODULE,
+				  &d->tracker);
 	if (IS_ERR(d->dpll)) {
 		ret = PTR_ERR(d->dpll);
 		dev_err(ice_pf_to_dev(pf),
@@ -3287,7 +3289,7 @@ ice_dpll_init_dpll(struct ice_pf *pf, struct ice_dpll *d, bool cgu,
 		ice_dpll_update_state(pf, d, true);
 		ret = dpll_device_register(d->dpll, type, ops, d);
 		if (ret) {
-			dpll_device_put(d->dpll, NULL);
+			dpll_device_put(d->dpll, &d->tracker);
 			return ret;
 		}
 		d->ops = ops;
diff --git a/drivers/net/ethernet/intel/ice/ice_dpll.h b/drivers/net/ethernet/intel/ice/ice_dpll.h
index c0da03384ce91..63fac6510df6e 100644
--- a/drivers/net/ethernet/intel/ice/ice_dpll.h
+++ b/drivers/net/ethernet/intel/ice/ice_dpll.h
@@ -23,6 +23,7 @@ enum ice_dpll_pin_sw {
 /** ice_dpll_pin - store info about pins
  * @pin: dpll pin structure
  * @pf: pointer to pf, which has registered the dpll_pin
+ * @tracker: reference count tracker
  * @idx: ice pin private idx
  * @num_parents: hols number of parent pins
  * @parent_idx: hold indexes of parent pins
@@ -37,6 +38,7 @@ enum ice_dpll_pin_sw {
 struct ice_dpll_pin {
 	struct dpll_pin *pin;
 	struct ice_pf *pf;
+	dpll_tracker tracker;
 	u8 idx;
 	u8 num_parents;
 	u8 parent_idx[ICE_DPLL_RCLK_NUM_MAX];
@@ -58,6 +60,7 @@ struct ice_dpll_pin {
 /** ice_dpll - store info required for DPLL control
  * @dpll: pointer to dpll dev
  * @pf: pointer to pf, which has registered the dpll_device
+ * @tracker: reference count tracker
  * @dpll_idx: index of dpll on the NIC
  * @input_idx: currently selected input index
  * @prev_input_idx: previously selected input index
@@ -76,6 +79,7 @@ struct ice_dpll_pin {
 struct ice_dpll {
 	struct dpll_device *dpll;
 	struct ice_pf *pf;
+	dpll_tracker tracker;
 	u8 dpll_idx;
 	u8 input_idx;
 	u8 prev_input_idx;
-- 
2.51.2