qcacld-3.0: Debugfs Implementation for dp trace collection

Implement debugfs interface to dump DP trace buffer
to a debugfs file.

Change-Id: I51ac3acbfc404b87cacc8a247f85cc4ee9971b61
CRs-Fixed: 2180977

2 files changed, 99 insertions, 0 deletions

diff --git a/core/dp/txrx/ol_txrx.c b/core/dp/txrx/ol_txrx.c
index 889954325c23..8dcd7b680a46 100644
--- a/core/dp/txrx/ol_txrx.c
+++ b/core/dp/txrx/ol_txrx.c
@@ -32,6 +32,7 @@
 #include <qdf_types.h>          /* qdf_device_t, qdf_print */
 #include <qdf_lock.h>           /* qdf_spinlock */
 #include <qdf_atomic.h>         /* qdf_atomic_read */
+#include <qdf_debugfs.h>
 
 #if defined(HIF_PCI) || defined(HIF_SNOC) || defined(HIF_AHB)
 /* Required for WLAN_FEATURE_FASTPATH */
@@ -94,6 +95,11 @@
 /* thresh for peer's cached buf queue beyond which the elements are dropped */
 #define OL_TXRX_CACHED_BUFQ_THRESH 128
 
+#define DPT_DEBUGFS_PERMS	(QDF_FILE_USR_READ |	\
+				QDF_FILE_USR_WRITE |	\
+				QDF_FILE_GRP_READ |	\
+				QDF_FILE_OTH_READ)
+
 /* These macros are expected to be used only for data path.
  * Existing APIs cannot be used since they log every time
  * they are used. Other modules, outside of data path should
@@ -1227,6 +1233,82 @@ static void ol_txrx_tso_stats_clear(ol_txrx_pdev_handle pdev)
 #endif /* defined(FEATURE_TSO) && defined(FEATURE_TSO_DEBUG) */
 
 /**
+ * ol_txrx_read_dpt_buff_debugfs() - read dp trace buffer
+ * @file: file to read
+ * @arg: pdev object
+ *
+ * Return: QDF_STATUS
+ */
+static QDF_STATUS ol_txrx_read_dpt_buff_debugfs(qdf_debugfs_file_t file,
+						void *arg)
+{
+	struct ol_txrx_pdev_t *pdev = (struct ol_txrx_pdev_t *)arg;
+	uint32_t i = 0;
+	QDF_STATUS status = QDF_STATUS_SUCCESS;
+
+	if (pdev->state == QDF_DPT_DEBUGFS_STATE_SHOW_STATE_INVALID)
+		return QDF_STATUS_E_INVAL;
+	else if (pdev->state == QDF_DPT_DEBUGFS_STATE_SHOW_COMPLETE) {
+		pdev->state = QDF_DPT_DEBUGFS_STATE_SHOW_STATE_INIT;
+		return QDF_STATUS_SUCCESS;
+	}
+
+	i = qdf_dpt_get_curr_pos_debugfs(file, pdev->state);
+	status =  qdf_dpt_dump_stats_debugfs(file, i);
+	if (status == QDF_STATUS_E_FAILURE)
+		pdev->state = QDF_DPT_DEBUGFS_STATE_SHOW_IN_PROGRESS;
+	else if (status == QDF_STATUS_SUCCESS)
+		pdev->state = QDF_DPT_DEBUGFS_STATE_SHOW_COMPLETE;
+
+	return status;
+}
+
+/**
+ * ol_txrx_write_dpt_buff_debugfs() - set dp trace parameters
+ * @priv: pdev object
+ * @buf: buff to get value for dpt parameters
+ * @len: buf length
+ *
+ * Return: QDF_STATUS
+ */
+static QDF_STATUS ol_txrx_write_dpt_buff_debugfs(void *priv,
+					      const char *buf,
+					      qdf_size_t len)
+{
+	return QDF_STATUS_SUCCESS;
+}
+
+static int ol_txrx_debugfs_init(struct ol_txrx_pdev_t *pdev)
+{
+	pdev->dpt_debugfs_fops.show = ol_txrx_read_dpt_buff_debugfs;
+	pdev->dpt_debugfs_fops.write = ol_txrx_write_dpt_buff_debugfs;
+	pdev->dpt_debugfs_fops.priv = pdev;
+
+	pdev->dpt_stats_log_dir = qdf_debugfs_create_dir("dpt_stats", NULL);
+
+	if (!pdev->dpt_stats_log_dir) {
+		QDF_TRACE(QDF_MODULE_ID_TXRX, QDF_TRACE_LEVEL_ERROR,
+				"%s: error while creating debugfs dir for %s",
+				__func__, "dpt_stats");
+		pdev->state = QDF_DPT_DEBUGFS_STATE_SHOW_STATE_INVALID;
+		return -EBUSY;
+	}
+
+	if (!qdf_debugfs_create_file("dump_set_dpt_logs", DPT_DEBUGFS_PERMS,
+				     pdev->dpt_stats_log_dir,
+				     &pdev->dpt_debugfs_fops)) {
+		QDF_TRACE(QDF_MODULE_ID_TXRX, QDF_TRACE_LEVEL_ERROR,
+				"%s: debug Entry creation failed!",
+				__func__);
+		pdev->state = QDF_DPT_DEBUGFS_STATE_SHOW_STATE_INVALID;
+		return -EBUSY;
+	}
+
+	pdev->state = QDF_DPT_DEBUGFS_STATE_SHOW_STATE_INIT;
+	return 0;
+}
+
+/**
  * ol_txrx_pdev_attach() - allocate txrx pdev
  * @ctrl_pdev: cfg pdev
  * @htc_pdev: HTC pdev
@@ -1310,6 +1392,8 @@ ol_txrx_pdev_attach(ol_pdev_handle ctrl_pdev,
 	pdev->tid_to_ac[OL_TX_NUM_TIDS + OL_TX_VDEV_DEFAULT_MGMT] =
 		OL_TX_SCHED_WRR_ADV_CAT_MCAST_MGMT;
 
+	ol_txrx_debugfs_init(pdev);
+
 	return pdev;
 
 fail3:
@@ -2042,6 +2126,11 @@ void ol_txrx_pdev_pre_detach(ol_txrx_pdev_handle pdev, int force)
 #endif
 }
 
+static void ol_txrx_debugfs_exit(ol_txrx_pdev_handle pdev)
+{
+	qdf_debugfs_remove_dir_recursive(pdev->dpt_stats_log_dir);
+}
+
 /**
  * ol_txrx_pdev_detach() - delete the data SW state
  * @pdev - the data physical device object being removed
@@ -2102,6 +2191,8 @@ void ol_txrx_pdev_detach(ol_txrx_pdev_handle pdev)
 
 	ol_txrx_pdev_txq_log_destroy(pdev);
 	ol_txrx_pdev_grp_stat_destroy(pdev);
+
+	ol_txrx_debugfs_exit(pdev);
 }
 
 #if defined(CONFIG_PER_VDEV_TX_DESC_POOL)
diff --git a/core/dp/txrx/ol_txrx_types.h b/core/dp/txrx/ol_txrx_types.h
index 6d88d95f1b54..39a0fdd158fe 100644
--- a/core/dp/txrx/ol_txrx_types.h
+++ b/core/dp/txrx/ol_txrx_types.h
@@ -51,6 +51,7 @@
 #include "ol_txrx_osif_api.h" /* ol_rx_callback_fp */
 #include "cdp_txrx_flow_ctrl_v2.h"
 #include "cdp_txrx_peer_ops.h"
+#include <qdf_trace.h>
 
 /*
  * The target may allocate multiple IDs for a peer.
@@ -552,6 +553,7 @@ struct ol_txrx_stats_req_internal {
     int offset;
 };
 
+
 /*
  * As depicted in the diagram below, the pdev contains an array of
  * NUM_EXT_TID ol_tx_active_queues_in_tid_t elements.
@@ -1027,6 +1029,12 @@ struct ol_txrx_pdev_t {
 		void (*offld_flush_cb)(void *);
 	} rx_offld_info;
 	struct ol_txrx_peer_t *self_peer;
+
+	/* dp debug fs */
+	struct dentry *dpt_stats_log_dir;
+	enum qdf_dpt_debugfs_state state;
+	struct qdf_debugfs_fops dpt_debugfs_fops;
+
 };
 
 struct ol_txrx_ocb_chan_info {