iwlwifi: implement fseq version mismatch warning

During init, the FW checks whether the FSEQ value matches what it
expects.  If it doesn't match, we print a warning to let integrators
clearly know that something is wrong.  This can happen if another core
(i.e. not WiFi) has updated the FSEQ version.  This notification is
only sent by the FW in production, for development firmwares, an
assertion is triggered instead.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Mordechai Goodstein <mordechay.goodstein@intel.com>

drivers/net/wireless/intel/iwlwifi/Makefile

@@ -12,6 +12,7 @@ iwlwifi-$(CONFIG_IWLMVM) += cfg/7000.o cfg/8000.o cfg/9000.o cfg/a000.o
 iwlwifi-objs		+= iwl-trans.o
 iwlwifi-objs		+= fw/notif-wait.o
 iwlwifi-$(CONFIG_IWLMVM) += fw/paging.o fw/smem.o fw/init.o fw/dbg.o
+iwlwifi-$(CONFIG_IWLMVM) += fw/common_rx.o
 
 iwlwifi-objs += $(iwlwifi-m)
 

drivers/net/wireless/intel/iwlwifi/fw/api/alive.h

@@ -187,4 +187,20 @@ struct iwl_card_state_notif {
 	__le32 flags;
 } __packed; /* CARD_STATE_NTFY_API_S_VER_1 */
 
+/**
+ * struct iwl_fseq_ver_mismatch_nty - Notification about version
+ *
+ * This notification does not have a direct impact on the init flow.
+ * It means that another core (not WiFi) has initiated the FSEQ flow
+ * and updated the FSEQ version.  The driver only prints an error when
+ * this occurs.
+ *
+ * @aux_read_fseq_ver: auxiliary read FSEQ version
+ * @wifi_fseq_ver: FSEQ version (embedded in WiFi)
+ */
+struct iwl_fseq_ver_mismatch_ntf {
+	__le32 aux_read_fseq_ver;
+	__le32 wifi_fseq_ver;
+} __packed; /* FSEQ_VER_MISMATCH_NTFY_API_S_VER_1 */
+
 #endif /* __iwl_fw_api_alive_h__ */

drivers/net/wireless/intel/iwlwifi/fw/api/commands.h

@@ -652,6 +652,13 @@ enum iwl_system_subcmd_ids {
 	 * @INIT_EXTENDED_CFG_CMD: &struct iwl_init_extended_cfg_cmd
 	 */
 	INIT_EXTENDED_CFG_CMD = 0x03,
+
+	/**
+	 * @FSEQ_VER_MISMATCH_NTF: Notification about fseq version
+	 *	mismatch during init.  The format is specified in
+	 *	&struct iwl_fseq_ver_mismatch_ntf.
+	 */
+	FSEQ_VER_MISMATCH_NTF = 0xFF,
 };
 
 #endif /* __iwl_fw_api_commands_h__ */

drivers/net/wireless/intel/iwlwifi/fw/common_rx.c

@@ -0,0 +1,88 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2017 Intel Deutschland GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called COPYING.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <linuxwifi@intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 Intel Deutschland GmbH
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+#include "iwl-drv.h"
+#include "runtime.h"
+#include "fw/api/commands.h"
+#include "fw/api/alive.h"
+
+static void iwl_fwrt_fseq_ver_mismatch(struct iwl_fw_runtime *fwrt,
+				       struct iwl_rx_cmd_buffer *rxb)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	struct iwl_fseq_ver_mismatch_ntf *fseq = (void *)pkt->data;
+
+	IWL_ERR(fwrt, "FSEQ version mismatch (aux: %d, wifi: %d)\n",
+		__le32_to_cpu(fseq->aux_read_fseq_ver),
+		__le32_to_cpu(fseq->wifi_fseq_ver));
+}
+
+void iwl_fwrt_handle_notification(struct iwl_fw_runtime *fwrt,
+				  struct iwl_rx_cmd_buffer *rxb)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	u32 cmd = WIDE_ID(pkt->hdr.group_id, pkt->hdr.cmd);
+
+	switch (cmd) {
+	case WIDE_ID(SYSTEM_GROUP, FSEQ_VER_MISMATCH_NTF):
+		iwl_fwrt_fseq_ver_mismatch(fwrt, rxb);
+		break;
+	default:
+		break;
+	}
+}
+IWL_EXPORT_SYMBOL(iwl_fwrt_handle_notification);

drivers/net/wireless/intel/iwlwifi/fw/runtime.h

@@ -150,4 +150,7 @@ void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt);
 
 void iwl_get_shared_mem_conf(struct iwl_fw_runtime *fwrt);
 
+void iwl_fwrt_handle_notification(struct iwl_fw_runtime *fwrt,
+				  struct iwl_rx_cmd_buffer *rxb);
+
 #endif /* __iwl_fw_runtime_h__ */

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

@@ -1006,8 +1006,10 @@ static void iwl_mvm_rx_common(struct iwl_mvm *mvm,
 		list_add_tail(&entry->list, &mvm->async_handlers_list);
 		spin_unlock(&mvm->async_handlers_lock);
 		schedule_work(&mvm->async_handlers_wk);
-		break;
+		return;
 	}
+
+	iwl_fwrt_handle_notification(&mvm->fwrt, rxb);
 }
 
 static void iwl_mvm_rx(struct iwl_op_mode *op_mode,