iwlwifi: mvm: add debugfs to force CT-kill

CT-kill is a thermal-based "RF-kill", which disables the NIC
completely if the temperature gets too high, in order to avoid damage.

Add a debugfs entry to simulate high temperatures, in order to test
CT-kill flows in the driver without having to physically heat the
device up.
Signed-off-by: Chaya Rachel Ivgi <chaya.rachel.ivgi@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c

@@ -114,6 +114,18 @@ static ssize_t iwl_dbgfs_stop_ctdp_write(struct iwl_mvm *mvm, char *buf,
 	return ret ?: count;
 }
 
+static ssize_t iwl_dbgfs_force_ctkill_write(struct iwl_mvm *mvm, char *buf,
+					    size_t count, loff_t *ppos)
+{
+	if (!iwl_mvm_firmware_running(mvm) ||
+	    mvm->fwrt.cur_fw_img != IWL_UCODE_REGULAR)
+		return -EIO;
+
+	iwl_mvm_enter_ctkill(mvm);
+
+	return count;
+}
+
 static ssize_t iwl_dbgfs_tx_flush_write(struct iwl_mvm *mvm, char *buf,
 					size_t count, loff_t *ppos)
 {
@@ -1641,6 +1653,7 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(prph_reg, 64);
 /* Device wide debugfs entries */
 MVM_DEBUGFS_READ_FILE_OPS(ctdp_budget);
 MVM_DEBUGFS_WRITE_FILE_OPS(stop_ctdp, 8);
+MVM_DEBUGFS_WRITE_FILE_OPS(force_ctkill, 8);
 MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush, 16);
 MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain, 8);
 MVM_DEBUGFS_WRITE_FILE_OPS(send_echo_cmd, 8);
@@ -1828,6 +1841,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 	MVM_DEBUGFS_ADD_FILE(nic_temp, dbgfs_dir, S_IRUSR);
 	MVM_DEBUGFS_ADD_FILE(ctdp_budget, dbgfs_dir, S_IRUSR);
 	MVM_DEBUGFS_ADD_FILE(stop_ctdp, dbgfs_dir, S_IWUSR);
+	MVM_DEBUGFS_ADD_FILE(force_ctkill, dbgfs_dir, S_IWUSR);
 	MVM_DEBUGFS_ADD_FILE(stations, dbgfs_dir, S_IRUSR);
 	MVM_DEBUGFS_ADD_FILE(bt_notif, dbgfs_dir, S_IRUSR);
 	MVM_DEBUGFS_ADD_FILE(bt_cmd, dbgfs_dir, S_IRUSR);

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -1755,6 +1755,7 @@ void iwl_mvm_thermal_exit(struct iwl_mvm *mvm);
 void iwl_mvm_set_hw_ctkill_state(struct iwl_mvm *mvm, bool state);
 int iwl_mvm_get_temp(struct iwl_mvm *mvm, s32 *temp);
 void iwl_mvm_ct_kill_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb);
+void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm);
 int iwl_mvm_send_temp_report_ths_cmd(struct iwl_mvm *mvm);
 int iwl_mvm_ctdp_command(struct iwl_mvm *mvm, u32 op, u32 budget);
 

drivers/net/wireless/intel/iwlwifi/mvm/tt.c

@@ -71,7 +71,7 @@
 
 #define IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT	HZ
 
-static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
+void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
 {
 	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 	u32 duration = tt->params.ct_kill_duration;