linux-kernel - [PATCH v2 3/3] ath10k: Add debugfs support to enable event history

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Message-Id: <1596220042-2778-4-git-send-email-pillair@codeaurora.org>
Date:   Fri, 31 Jul 2020 23:57:22 +0530
From:   Rakesh Pillai <pillair@...eaurora.org>
To:     ath10k@...ts.infradead.org
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, Rakesh Pillai <pillair@...eaurora.org>
Subject: [PATCH v2 3/3] ath10k: Add debugfs support to enable event history

Add the support to enable/disable the recording of
debug events history.

The enable/disable of the history from debugfs will
not make any affect if its not enabled via module
parameter.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1

Signed-off-by: Rakesh Pillai <pillair@...eaurora.org>
---
 drivers/net/wireless/ath/ath10k/debug.c | 56 +++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 5d08652..6785fae 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -610,6 +610,59 @@ static const struct file_operations fops_simulate_fw_crash = {
 	.llseek = default_llseek,
 };
 
+static ssize_t ath10k_read_history_enable(struct file *file,
+					  char __user *user_buf,
+					  size_t count, loff_t *ppos)
+{
+	const char buf[] =
+		"To enable recording of certain event history, write to this file with the enable mask\n"
+		"BIT(0): Enable Reg Access history\n"
+		"	- Register write events\n"
+		"	- Register read events\n"
+		"BIT(1): Enable CE events history\n"
+		"	- ATH10K_IRQ_TRIGGER event\n"
+		"	- ATH10K_NAPI_POLL event\n"
+		"	- ATH10K_CE_SERVICE event\n"
+		"	- ATH10K_NAPI_COMPLETE event\n"
+		"	- ATH10K_NAPI_RESCHED event\n"
+		"	- ATH10K_IRQ_SUMMARY event\n"
+		"BIT(2): Enable WMI CMD history\n"
+		"	- WMI CMD event\n"
+		"	- WMI CMD TX completion event\n"
+		"BIT(3): Enable WMI events history\n"
+		"	- WMI Events event\n";
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
+}
+
+static ssize_t ath10k_write_history_enable(struct file *file,
+					   const char __user *user_buf,
+					   size_t count, loff_t *ppos)
+{
+	u32 history_enable_mask;
+	int i, ret;
+
+	ret = kstrtou32_from_user(user_buf, count, 0, &history_enable_mask);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ATH10K_HISTORY_MAX; i++)
+		if (history_enable_mask & BIT(i))
+			set_bit(i, &ath10k_history_enable_mask);
+		else
+			clear_bit(i, &ath10k_history_enable_mask);
+
+	return count;
+}
+
+static const struct file_operations fops_history_enable = {
+	.read = ath10k_read_history_enable,
+	.write = ath10k_write_history_enable,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
 static ssize_t ath10k_read_chip_id(struct file *file, char __user *user_buf,
 				   size_t count, loff_t *ppos)
 {
@@ -2658,6 +2711,9 @@ int ath10k_debug_register(struct ath10k *ar)
 	debugfs_create_file("reset_htt_stats", 0200, ar->debug.debugfs_phy, ar,
 			    &fops_reset_htt_stats);
 
+	debugfs_create_file("history_enable", 0644, ar->debug.debugfs_phy, ar,
+			    &fops_history_enable);
+
 	return 0;
 }
 
-- 
2.7.4