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Commit 141b03e0 authored by Wey-Yi Guy's avatar Wey-Yi Guy Committed by John W. Linville
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iwlwifi: tx/rx queue pointer information 



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: default avatarWey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 22fdf3c9

drivers/net/wireless/iwlwifi/iwl-debug.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/wireless/iwlwifi/iwl-debugfs.c

+69 −0
Original line number Diff line number Diff line
@@ -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);