From 8c65699274a695df941407ccb91c633819039193 Mon Sep 17 00:00:00 2001 From: Marek Puzyniak Date: Fri, 21 Mar 2014 17:46:56 +0200 Subject: [PATCH] ath10k: add soft/hard firmware crash option to simulate_fw_crash Command WMI_FORCE_FW_HANG_CMDID is not supported in firmware 10.1. In order to have firmware crash simulation functionality also in firmware 10.1 driver can force firmware crash by performing not allowed operation. Driver can deliberately crash firmware when setting vdev param for vdev id out of range. This patch introduces two keywords to simulate_fw_crash: 'soft' which will cause firmware crash that is recoverable by warm firmware reset but supported only in main firmware. 'hard' which will cause firmware crash recoverable by cold firmware reset, this option works for both firmwares. Commands to trigger firmware soft/hard crash: echo 'soft' > /sys/kernel/debug/ieee80211/phyX/ath10k/simulate_fw_crash echo 'hard' > /sys/kernel/debug/ieee80211/phyX/ath10k/simulate_fw_crash kvalo: remove '\n' before checking the command and simplify how buf is null terminated Signed-off-by: Marek Puzyniak Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/debug.c | 54 ++++++++++++++++++------- 1 file changed, 40 insertions(+), 14 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c index 6debd281350a..465d782b9e39 100644 --- a/drivers/net/wireless/ath/ath10k/debug.c +++ b/drivers/net/wireless/ath/ath10k/debug.c @@ -451,27 +451,37 @@ 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"; + const char buf[] = "To simulate firmware crash write one of the" + " keywords to this file:\n `soft` - this will send" + " WMI_FORCE_FW_HANG_ASSERT to firmware if FW" + " supports that command.\n `hard` - this will send" + " to firmware command with illegal parameters" + " causing firmware crash.\n"; + return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); } +/* Simulate firmware crash: + * 'soft': Call wmi command causing firmware hang. This firmware hang is + * recoverable by warm firmware reset. + * 'hard': Force firmware crash by setting any vdev parameter for not allowed + * vdev id. This is hard firmware crash because it is recoverable only by cold + * firmware reset. + */ 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] = {}; + 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; - } + + /* make sure that buf is null terminated */ + buf[sizeof(buf) - 1] = 0; if (ar->state != ATH10K_STATE_ON && ar->state != ATH10K_STATE_RESTARTED) { @@ -479,14 +489,30 @@ static ssize_t ath10k_write_simulate_fw_crash(struct file *file, goto exit; } - ath10k_info("simulating firmware crash\n"); + /* drop the possible '\n' from the end */ + if (buf[count - 1] == '\n') { + buf[count - 1] = 0; + count--; + } - 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 (!strcmp(buf, "soft")) { + ath10k_info("simulating soft firmware crash\n"); + ret = ath10k_wmi_force_fw_hang(ar, WMI_FORCE_FW_HANG_ASSERT, 0); + } else if (!strcmp(buf, "hard")) { + ath10k_info("simulating hard firmware crash\n"); + ret = ath10k_wmi_vdev_set_param(ar, TARGET_NUM_VDEVS + 1, + ar->wmi.vdev_param->rts_threshold, 0); + } else { + ret = -EINVAL; + goto exit; + } + + if (ret) { + ath10k_warn("failed to simulate firmware crash: %d\n", ret); + goto exit; + } - if (ret == 0) - ret = count; + ret = count; exit: mutex_unlock(&ar->conf_mutex); -- 2.39.5