From 278c4a85e6267979ab164c0a8b57447005cf388c Mon Sep 17 00:00:00 2001 From: Michal Kazior Date: Mon, 22 Jul 2013 14:08:51 +0200 Subject: [PATCH] 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: Michal Kazior Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/debug.c | 57 +++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c index 65279f5347c8..3d65594fa098 100644 --- a/drivers/net/wireless/ath/ath10k/debug.c +++ b/drivers/net/wireless/ath/ath10k/debug.c @@ -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 */ -- 2.34.1