qcacmn: Check for tx desc leak or corruption

Tx descriptor is not being freed and put back in tx desc
pool for a long time. As a result, system is not going
into suspended state.
To find this descriptor, during dp_bus_suspend and
dp_runtime_suspend, parse through the descriptor pool to
check for any descriptors not freed for a long and trigger
self recovery when found.

Change-Id: Id97c5c8537c9bec922f4e254b5bf094505ee61ff
CRs-Fixed: 3109868

dp/wifi3.0/dp_tx_desc.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2016-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -93,6 +93,19 @@ do {                                                   \
 #endif /* !QCA_LL_TX_FLOW_CONTROL_V2 */
 #define MAX_POOL_BUFF_COUNT 10000
 
+#ifdef DP_TX_TRACKING
+static inline void dp_tx_desc_set_magic(struct dp_tx_desc_s *tx_desc,
+					uint32_t magic_pattern)
+{
+	tx_desc->magic = magic_pattern;
+}
+#else
+static inline void dp_tx_desc_set_magic(struct dp_tx_desc_s *tx_desc,
+					uint32_t magic_pattern)
+{
+}
+#endif
+
 QDF_STATUS dp_tx_desc_pool_alloc(struct dp_soc *soc, uint8_t pool_id,
 				 uint16_t num_elem);
 QDF_STATUS dp_tx_desc_pool_init(struct dp_soc *soc, uint8_t pool_id,
@@ -301,7 +314,8 @@ dp_tx_desc_alloc(struct dp_soc *soc, uint8_t desc_pool_id)
 			tx_desc = dp_tx_get_desc_flow_pool(pool);
 			tx_desc->pool_id = desc_pool_id;
 			tx_desc->flags = DP_TX_DESC_FLAG_ALLOCATED;
-
+			dp_tx_desc_set_magic(tx_desc,
+					     DP_TX_MAGIC_PATTERN_INUSE);
 			is_pause = dp_tx_is_threshold_reached(pool,
 							      pool->avail_desc);
 
@@ -391,6 +405,8 @@ dp_tx_desc_free(struct dp_soc *soc, struct dp_tx_desc_s *tx_desc,
 	tx_desc->vdev_id = DP_INVALID_VDEV_ID;
 	tx_desc->nbuf = NULL;
 	tx_desc->flags = 0;
+	dp_tx_desc_set_magic(tx_desc, DP_TX_MAGIC_PATTERN_FREE);
+	tx_desc->timestamp = 0;
 	dp_tx_put_desc_flow_pool(pool, tx_desc);
 	switch (pool->status) {
 	case FLOW_POOL_ACTIVE_PAUSED:
@@ -503,6 +519,8 @@ dp_tx_desc_alloc(struct dp_soc *soc, uint8_t desc_pool_id)
 			tx_desc = dp_tx_get_desc_flow_pool(pool);
 			tx_desc->pool_id = desc_pool_id;
 			tx_desc->flags = DP_TX_DESC_FLAG_ALLOCATED;
+			dp_tx_desc_set_magic(tx_desc,
+					     DP_TX_MAGIC_PATTERN_INUSE);
 			if (qdf_unlikely(pool->avail_desc < pool->stop_th)) {
 				pool->status = FLOW_POOL_ACTIVE_PAUSED;
 				qdf_spin_unlock_bh(&pool->flow_pool_lock);
@@ -555,6 +573,7 @@ dp_tx_desc_free(struct dp_soc *soc, struct dp_tx_desc_s *tx_desc,
 	tx_desc->vdev_id = DP_INVALID_VDEV_ID;
 	tx_desc->nbuf = NULL;
 	tx_desc->flags = 0;
+	dp_tx_desc_set_magic(tx_desc, DP_TX_MAGIC_PATTERN_FREE);
 	dp_tx_put_desc_flow_pool(pool, tx_desc);
 	switch (pool->status) {
 	case FLOW_POOL_ACTIVE_PAUSED: