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ath10k: support firmware crash-by-assert 

10.1 firmware does not have an official way to
cause assert on purpose, but it can be done with
carefully crafted WMI command.  This is a different
kind of crash from the 'hard' crash, which is
a bad memory dereference.

Different crashes decode in different manners, so
this will help the crash-report testing as well as
offer better ways to test firmware failure and
recovery.

kvalo: move the wmi command creation to debug.c, modify
the info print

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Ben Greear 2014-09-10 18:59:28 +03:00 committed by Kalle Valo
parent 43d2a30fa8
commit d5aebc77b4
1 changed files with 27 additions and 1 deletions
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28
drivers/net/wireless/ath/ath10k/debug.c
View File

@ -565,6 +565,26 @@ static const struct file_operations fops_fw_stats = {
.llseek = default_llseek, .llseek = default_llseek,
}; };
/* This is a clean assert crash in firmware. */
static int ath10k_debug_fw_assert(struct ath10k *ar)
{
struct wmi_vdev_install_key_cmd *cmd;
struct sk_buff *skb;
skb = ath10k_wmi_alloc_skb(ar, sizeof(*cmd) + 16);
if (!skb)
return -ENOMEM;
cmd = (struct wmi_vdev_install_key_cmd *)skb->data;
memset(cmd, 0, sizeof(*cmd));
/* big enough number so that firmware asserts */
cmd->vdev_id = __cpu_to_le32(0x7ffe);
return ath10k_wmi_cmd_send(ar, skb,
ar->wmi.cmd->vdev_install_key_cmdid);
}
static ssize_t ath10k_read_simulate_fw_crash(struct file *file, static ssize_t ath10k_read_simulate_fw_crash(struct file *file,
char __user *user_buf, char __user *user_buf,
size_t count, loff_t *ppos) size_t count, loff_t *ppos)
@ -574,7 +594,10 @@ static ssize_t ath10k_read_simulate_fw_crash(struct file *file,
" WMI_FORCE_FW_HANG_ASSERT to firmware if FW" " WMI_FORCE_FW_HANG_ASSERT to firmware if FW"
" supports that command.\n `hard` - this will send" " supports that command.\n `hard` - this will send"
" to firmware command with illegal parameters" " to firmware command with illegal parameters"
" causing firmware crash.\n"; " causing firmware crash.\n"
"`assert` - this will send special illegal parameter"
" to firmware to cause assert failure"
" and crash.\n";
return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
} }
@ -623,6 +646,9 @@ static ssize_t ath10k_write_simulate_fw_crash(struct file *file,
*/ */
ret = ath10k_wmi_vdev_set_param(ar, 0x7fff, ret = ath10k_wmi_vdev_set_param(ar, 0x7fff,
ar->wmi.vdev_param->rts_threshold, 0); ar->wmi.vdev_param->rts_threshold, 0);
} else if (!strcmp(buf, "assert")) {
ath10k_info(ar, "simulating firmware assert crash\n");
ret = ath10k_debug_fw_assert(ar);
} else { } else {
ret = -EINVAL; ret = -EINVAL;
goto exit; goto exit;