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Commit 278c4a85 authored by Michal Kazior's avatar Michal Kazior Committed by Kalle Valo
Browse files

ath10k: create debugfs interface to trigger fw crash 



This can be useful for testing. To perform a
forced firmware crash write 'crash' to
'simulate_fw_crash' debugfs file. E.g.

  echo crash > /sys/kernel/debug/ieee80211/phy1/ath10k/simulate_fw_crash

Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarKalle Valo <kvalo@qca.qualcomm.com>
parent cf84bd4d

drivers/net/wireless/ath/ath10k/debug.c

+57 −0
Original line number Diff line number Diff line
@@ -445,6 +445,60 @@ static const struct file_operations fops_fw_stats = { 
	.llseek = default_llseek,

};



static ssize_t ath10k_read_simulate_fw_crash(struct file *file,

					     char __user *user_buf,

					     size_t count, loff_t *ppos)

{

	const char buf[] = "To simulate firmware crash write the keyword"

			   " `crash` to this file.\nThis will force firmware"

			   " to report a crash to the host system.\n";

	return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));

}



static ssize_t ath10k_write_simulate_fw_crash(struct file *file,

					      const char __user *user_buf,

					      size_t count, loff_t *ppos)

{

	struct ath10k *ar = file->private_data;

	char buf[32] = {};

	int ret;



	mutex_lock(&ar->conf_mutex);



	simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);

	if (strcmp(buf, "crash") && strcmp(buf, "crash\n")) {

		ret = -EINVAL;

		goto exit;

	}



	if (ar->state != ATH10K_STATE_ON &&

	    ar->state != ATH10K_STATE_RESTARTED) {

		ret = -ENETDOWN;

		goto exit;

	}



	ath10k_info("simulating firmware crash\n");



	ret = ath10k_wmi_force_fw_hang(ar, WMI_FORCE_FW_HANG_ASSERT, 0);

	if (ret)

		ath10k_warn("failed to force fw hang (%d)\n", ret);



	if (ret == 0)

		ret = count;



exit:

	mutex_unlock(&ar->conf_mutex);

	return ret;

}



static const struct file_operations fops_simulate_fw_crash = {

	.read = ath10k_read_simulate_fw_crash,

	.write = ath10k_write_simulate_fw_crash,

	.open = simple_open,

	.owner = THIS_MODULE,

	.llseek = default_llseek,

};



int ath10k_debug_create(struct ath10k *ar)

{

	ar->debug.debugfs_phy = debugfs_create_dir("ath10k",
@@ -461,6 +515,9 @@ int ath10k_debug_create(struct ath10k *ar) 
	debugfs_create_file("wmi_services", S_IRUSR, ar->debug.debugfs_phy, ar,

			    &fops_wmi_services);



	debugfs_create_file("simulate_fw_crash", S_IRUSR, ar->debug.debugfs_phy,

			    ar, &fops_simulate_fw_crash);



	return 0;

}

#endif /* CONFIG_ATH10K_DEBUGFS */