ath10k: add debugfs file to control firmware dbglog

Firmware dbglogs can be now enabled through fw_dbglog file. To enable all
possible log messages run:

echo 0xffffffff > /sys/kernel/debug/ieee80211/phy0/ath10k/fw_dbglog

And to put back firmare defaults use 0x0:

echo 0x0 > /sys/kernel/debug/ieee80211/phy0/ath10k/fw_dbglog

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 6bdfad3144af..6debd281350a 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -614,6 +614,61 @@ static const struct file_operations fops_htt_stats_mask = {
 	.llseek = default_llseek,
 };
 
+static ssize_t ath10k_read_fw_dbglog(struct file *file,
+					    char __user *user_buf,
+					    size_t count, loff_t *ppos)
+{
+	struct ath10k *ar = file->private_data;
+	unsigned int len;
+	char buf[32];
+
+	len = scnprintf(buf, sizeof(buf), "0x%08x\n",
+			ar->debug.fw_dbglog_mask);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t ath10k_write_fw_dbglog(struct file *file,
+				      const char __user *user_buf,
+				      size_t count, loff_t *ppos)
+{
+	struct ath10k *ar = file->private_data;
+	unsigned long mask;
+	int ret;
+
+	ret = kstrtoul_from_user(user_buf, count, 0, &mask);
+	if (ret)
+		return ret;
+
+	mutex_lock(&ar->conf_mutex);
+
+	ar->debug.fw_dbglog_mask = mask;
+
+	if (ar->state == ATH10K_STATE_ON) {
+		ret = ath10k_wmi_dbglog_cfg(ar, ar->debug.fw_dbglog_mask);
+		if (ret) {
+			ath10k_warn("dbglog cfg failed from debugfs: %d\n",
+				    ret);
+			goto exit;
+		}
+	}
+
+	ret = count;
+
+exit:
+	mutex_unlock(&ar->conf_mutex);
+
+	return ret;
+}
+
+static const struct file_operations fops_fw_dbglog = {
+	.read = ath10k_read_fw_dbglog,
+	.write = ath10k_write_fw_dbglog,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
 int ath10k_debug_start(struct ath10k *ar)
 {
 	int ret;
@@ -625,6 +680,14 @@ int ath10k_debug_start(struct ath10k *ar)
 		/* continue normally anyway, this isn't serious */
 		ath10k_warn("failed to start htt stats workqueue: %d\n", ret);
 
+	if (ar->debug.fw_dbglog_mask) {
+		ret = ath10k_wmi_dbglog_cfg(ar, ar->debug.fw_dbglog_mask);
+		if (ret)
+			/* not serious */
+			ath10k_warn("failed to enable dbglog during start: %d",
+				    ret);
+	}
+
 	return 0;
 }
 
@@ -747,6 +810,9 @@ int ath10k_debug_create(struct ath10k *ar)
 	debugfs_create_file("htt_stats_mask", S_IRUSR, ar->debug.debugfs_phy,
 			    ar, &fops_htt_stats_mask);
 
+	debugfs_create_file("fw_dbglog", S_IRUSR, ar->debug.debugfs_phy,
+			    ar, &fops_fw_dbglog);
+
 	if (config_enabled(CONFIG_ATH10K_DFS_CERTIFIED)) {
 		debugfs_create_file("dfs_simulate_radar", S_IWUSR,
 				    ar->debug.debugfs_phy, ar,