From: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx>
Adding debugfs function to show current TxFifo/RxFifo read/write
pointer, plus the current tx queue status (wake/stop) for both real and
virtual queue.
This is part of debug feature set to help debugging driver/uCode.
use tx_queue and rx_queue in
/sys/kernel/debug/ieee80211/phy0/iwlagn/debug directory to show the
current read/write pointer for both TxFifo and RxFifo queue
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
---
drivers/net/wireless/iwlwifi/iwl-debug.h | 2 +
drivers/net/wireless/iwlwifi/iwl-debugfs.c | 69 ++++++++++++++++++++++++++++
2 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-debug.h b/drivers/net/wireless/iwlwifi/iwl-debug.h
index 4ac06ad..cad5e27 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debug.h
+++ b/drivers/net/wireless/iwlwifi/iwl-debug.h
@@ -98,6 +98,8 @@ struct iwl_debugfs {
struct dentry *file_rx_statistics;
struct dentry *file_tx_statistics;
struct dentry *file_traffic_log;
+ struct dentry *file_rx_queue;
+ struct dentry *file_tx_queue;
} dbgfs_debug_files;
u32 sram_offset;
u32 sram_len;
diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index a0e5063..d4109cb 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -887,9 +887,74 @@ static ssize_t iwl_dbgfs_traffic_log_write(struct file *file,
return count;
}
+static ssize_t iwl_dbgfs_tx_queue_read(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos) {
+
+ struct iwl_priv *priv = (struct iwl_priv *)file->private_data;
+ struct iwl_tx_queue *txq;
+ struct iwl_queue *q;
+ char *buf;
+ int pos = 0;
+ int cnt;
+ int ret;
+ const size_t bufsz = sizeof(char) * 60 * IWL_MAX_NUM_QUEUES;
+
+ buf = kzalloc(bufsz, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
+ txq = &priv->txq[cnt];
+ q = &txq->q;
+ pos += scnprintf(buf + pos, bufsz - pos,
+ "hwq %.2d: read=%u write=%u stop=%d"
+ " swq_id=%#.2x (ac %d/hwq %d)\n",
+ cnt, q->read_ptr, q->write_ptr,
+ !!test_bit(cnt, priv->queue_stopped),
+ txq->swq_id,
+ txq->swq_id & 0x80 ? txq->swq_id & 3 :
+ txq->swq_id,
+ txq->swq_id & 0x80 ? (txq->swq_id >> 2) &
+ 0x1f : txq->swq_id);
+ if (cnt >= 4)
+ continue;
+ /* for the ACs, display the stop count too */
+ pos += scnprintf(buf + pos, bufsz - pos,
+ " stop-count: %d\n",
+ atomic_read(&priv->queue_stop_count[cnt]));
+ }
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+ kfree(buf);
+ return ret;
+}
+
+static ssize_t iwl_dbgfs_rx_queue_read(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos) {
+
+ struct iwl_priv *priv = (struct iwl_priv *)file->private_data;
+ struct iwl_rx_queue *rxq = &priv->rxq;
+ char buf[256];
+ int pos = 0;
+ const size_t bufsz = sizeof(buf);
+
+ pos += scnprintf(buf + pos, bufsz - pos, "read: %u\n",
+ rxq->read);
+ pos += scnprintf(buf + pos, bufsz - pos, "write: %u\n",
+ rxq->write);
+ pos += scnprintf(buf + pos, bufsz - pos, "free_count: %u\n",
+ rxq->free_count);
+ pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
+ le16_to_cpu(rxq->rb_stts->closed_rb_num) & 0x0FFF);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+}
+
DEBUGFS_READ_WRITE_FILE_OPS(rx_statistics);
DEBUGFS_READ_WRITE_FILE_OPS(tx_statistics);
DEBUGFS_READ_WRITE_FILE_OPS(traffic_log);
+DEBUGFS_READ_FILE_OPS(rx_queue);
+DEBUGFS_READ_FILE_OPS(tx_queue);
/*
* Create the debugfs files and directories
@@ -934,6 +999,8 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
DEBUGFS_ADD_FILE(rx_statistics, debug);
DEBUGFS_ADD_FILE(tx_statistics, debug);
DEBUGFS_ADD_FILE(traffic_log, debug);
+ DEBUGFS_ADD_FILE(rx_queue, debug);
+ DEBUGFS_ADD_FILE(tx_queue, debug);
DEBUGFS_ADD_BOOL(disable_sensitivity, rf, &priv->disable_sens_cal);
DEBUGFS_ADD_BOOL(disable_chain_noise, rf,
&priv->disable_chain_noise_cal);
@@ -976,6 +1043,8 @@ void iwl_dbgfs_unregister(struct iwl_priv *priv)
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_rx_statistics);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_tx_statistics);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_traffic_log);
+ DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_rx_queue);
+ DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_tx_queue);
DEBUGFS_REMOVE(priv->dbgfs->dir_debug);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_rf_files.file_disable_sensitivity);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_rf_files.file_disable_chain_noise);
--
1.5.6.3
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