iwlwifi: mvm: add trigger for firmware dump upon command response

This will allow to collect the data as soon the firmware
sends a specific notification of command response.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h

@@ -244,6 +244,8 @@ iwl_fw_error_next_data(struct iwl_fw_error_dump_data *data)
  * @FW_DBG_TRIGGER_MISSED_BEACONS: trigger log collection when beacons are
  *	missed.
  * @FW_DBG_TRIGGER_CHANNEL_SWITCH: trigger log collection upon channel switch.
+ * @FW_DBG_TRIGGER_FW_NOTIF: trigger log collection when the firmware sends a
+ *	command response or a notification.
  */
 enum iwl_fw_dbg_trigger {
 	FW_DBG_TRIGGER_INVALID = 0,
@@ -251,6 +253,7 @@ enum iwl_fw_dbg_trigger {
 	FW_DBG_TRIGGER_FW_ASSERT,
 	FW_DBG_TRIGGER_MISSED_BEACONS,
 	FW_DBG_TRIGGER_CHANNEL_SWITCH,
+	FW_DBG_TRIGGER_FW_NOTIF,
 
 	/* must be last */
 	FW_DBG_TRIGGER_MAX,

drivers/net/wireless/iwlwifi/iwl-fw-file.h

@@ -540,6 +540,17 @@ struct iwl_fw_dbg_trigger_missed_bcon {
 	__le32 reserved1[2];
 } __packed;
 
+/**
+ * struct iwl_fw_dbg_trigger_cmd - configures trigger for messages from FW.
+ * cmds: the list of commands to trigger the collection on
+ */
+struct iwl_fw_dbg_trigger_cmd {
+	struct cmd {
+		u8 cmd_id;
+		u8 group_id;
+	} __packed cmds[16];
+} __packed;
+
 /**
  * struct iwl_fw_dbg_conf_tlv - a TLV that describes a debug configuration.
  * @id: conf id

drivers/net/wireless/iwlwifi/mvm/ops.c

@@ -685,6 +685,38 @@ static void iwl_mvm_async_handlers_wk(struct work_struct *wk)
 	mutex_unlock(&mvm->mutex);
 }
 
+static inline void iwl_mvm_rx_check_trigger(struct iwl_mvm *mvm,
+					    struct iwl_rx_packet *pkt)
+{
+	struct iwl_fw_dbg_trigger_tlv *trig;
+	struct iwl_fw_dbg_trigger_cmd *cmds_trig;
+	char buf[32];
+	int i;
+
+	if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_FW_NOTIF))
+		return;
+
+	trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_FW_NOTIF);
+	cmds_trig = (void *)trig->data;
+
+	if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(cmds_trig->cmds); i++) {
+		/* don't collect on CMD 0 */
+		if (!cmds_trig->cmds[i].cmd_id)
+			break;
+
+		if (cmds_trig->cmds[i].cmd_id != pkt->hdr.cmd)
+			continue;
+
+		memset(buf, 0, sizeof(buf));
+		snprintf(buf, sizeof(buf), "CMD 0x%02x received", pkt->hdr.cmd);
+		iwl_mvm_fw_dbg_collect_trig(mvm, trig, buf, sizeof(buf));
+		break;
+	}
+}
+
 static int iwl_mvm_rx_dispatch(struct iwl_op_mode *op_mode,
 			       struct iwl_rx_cmd_buffer *rxb,
 			       struct iwl_device_cmd *cmd)
@@ -693,6 +725,8 @@ static int iwl_mvm_rx_dispatch(struct iwl_op_mode *op_mode,
 	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 	u8 i;
 
+	iwl_mvm_rx_check_trigger(mvm, pkt);
+
 	/*
 	 * Do the notification wait before RX handlers so
 	 * even if the RX handler consumes the RXB we have