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>

diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h
index 6c103ed..b9c7bec 100644 (file)
--- 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 91a486c..119cc54 100644 (file)
--- 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);