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>

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index f948a4d8ee595af71fd3f65090b45f450f29358b..c5d01058c2a3efcbadae155461a62da725dd9c1a 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -565,6 +565,26 @@ static const struct file_operations fops_fw_stats = {
        .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,
                                             char __user *user_buf,
                                             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"
                           " supports that command.\n `hard` - this will send"
                           " 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));
 }
@@ -623,6 +646,9 @@ static ssize_t ath10k_write_simulate_fw_crash(struct file *file,
                 */
                ret = ath10k_wmi_vdev_set_param(ar, 0x7fff,
                                        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 {
                ret = -EINVAL;
                goto exit;