ath9k_htc: Add a debugfs file to dump TX slot information

Location: ath9k_htc/phy#/slot

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h
index 6c103edf890a..b9c7bec9dd45 100644
--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -338,6 +338,7 @@ struct ath9k_debug {
         struct dentry *debugfs_tgt_stats;
         struct dentry *debugfs_xmit;
         struct dentry *debugfs_recv;
+        struct dentry *debugfs_slot;
         struct ath_tx_stats tx_stats;
         struct ath_rx_stats rx_stats;
         u32 txrate;
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
index 91a486cca32a..119cc544cea0 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
@@ -244,6 +244,41 @@ static const struct file_operations fops_recv = {
         .llseek = default_llseek,
 };
 
+static ssize_t read_file_slot(struct file *file, char __user *user_buf,
+                              size_t count, loff_t *ppos)
+{
+        struct ath9k_htc_priv *priv = file->private_data;
+        char buf[512];
+        unsigned int len = 0;
+
+        spin_lock_bh(&priv->tx.tx_lock);
+
+        len += snprintf(buf + len, sizeof(buf) - len, "TX slot bitmap : ");
+
+        len += bitmap_scnprintf(buf + len, sizeof(buf) - len,
+                               priv->tx.tx_slot, MAX_TX_BUF_NUM);
+
+        len += snprintf(buf + len, sizeof(buf) - len, "\n");
+
+        len += snprintf(buf + len, sizeof(buf) - len,
+                        "Used slots     : %d\n",
+                        bitmap_weight(priv->tx.tx_slot, MAX_TX_BUF_NUM));
+
+        spin_unlock_bh(&priv->tx.tx_lock);
+
+        if (len > sizeof(buf))
+                len = sizeof(buf);
+
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_slot = {
+        .read = read_file_slot,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE,
+        .llseek = default_llseek,
+};
+
 int ath9k_htc_init_debug(struct ath_hw *ah)
 {
         struct ath_common *common = ath9k_hw_common(ah);
@@ -276,6 +311,12 @@ int ath9k_htc_init_debug(struct ath_hw *ah)
         if (!priv->debug.debugfs_recv)
                 goto err;
 
+        priv->debug.debugfs_slot = debugfs_create_file("slot", S_IRUSR,
+                                                       priv->debug.debugfs_phy,
+                                                       priv, &fops_slot);
+        if (!priv->debug.debugfs_slot)
+                goto err;
+
         return 0;
 
 err:
@@ -288,6 +329,7 @@ void ath9k_htc_exit_debug(struct ath_hw *ah)
         struct ath_common *common = ath9k_hw_common(ah);
         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) common->priv;
 
+        debugfs_remove(priv->debug.debugfs_slot);
         debugfs_remove(priv->debug.debugfs_recv);
         debugfs_remove(priv->debug.debugfs_xmit);
         debugfs_remove(priv->debug.debugfs_tgt_stats);