net: wwan: iosm: move debugfs knobs into a subdir

The modem traces collection is a device (and so driver) specific option.
Therefore, move the related debugfs files into a driver-specific
subdirectory under the common per WWAN device directory.
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Acked-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wwan/iosm/Makefile

@@ -22,6 +22,7 @@ iosm-y = \
 	iosm_ipc_devlink.o		\
 	iosm_ipc_flash.o		\
 	iosm_ipc_coredump.o		\
+	iosm_ipc_debugfs.o		\
 	iosm_ipc_trace.o
 
 obj-$(CONFIG_IOSM) := iosm.o

drivers/net/wwan/iosm/iosm_ipc_debugfs.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020-2021 Intel Corporation.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/wwan.h>
+
+#include "iosm_ipc_imem.h"
+#include "iosm_ipc_trace.h"
+#include "iosm_ipc_debugfs.h"
+
+void ipc_debugfs_init(struct iosm_imem *ipc_imem)
+{
+	struct dentry *debugfs_pdev = wwan_get_debugfs_dir(ipc_imem->dev);
+
+	ipc_imem->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME,
+						   debugfs_pdev);
+
+	ipc_imem->trace = ipc_trace_init(ipc_imem);
+	if (!ipc_imem->trace)
+		dev_warn(ipc_imem->dev, "trace channel init failed");
+}
+
+void ipc_debugfs_deinit(struct iosm_imem *ipc_imem)
+{
+	ipc_trace_deinit(ipc_imem->trace);
+	debugfs_remove_recursive(ipc_imem->debugfs_dir);
+}

drivers/net/wwan/iosm/iosm_ipc_debugfs.h

+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2020-2021 Intel Corporation.
+ */
+
+#ifndef IOSM_IPC_DEBUGFS_H
+#define IOSM_IPC_DEBUGFS_H
+
+void ipc_debugfs_init(struct iosm_imem *ipc_imem);
+void ipc_debugfs_deinit(struct iosm_imem *ipc_imem);
+
+#endif

drivers/net/wwan/iosm/iosm_ipc_imem.c

@@ -11,6 +11,7 @@
 #include "iosm_ipc_imem.h"
 #include "iosm_ipc_port.h"
 #include "iosm_ipc_trace.h"
+#include "iosm_ipc_debugfs.h"
 
 /* Check the wwan ips if it is valid with Channel as input. */
 static int ipc_imem_check_wwan_ips(struct ipc_mem_channel *chnl)
@@ -554,9 +555,7 @@ static void ipc_imem_run_state_worker(struct work_struct *instance)
 		ctrl_chl_idx++;
 	}
 
-	ipc_imem->trace = ipc_trace_init(ipc_imem);
-	if (!ipc_imem->trace)
-		dev_warn(ipc_imem->dev, "trace channel init failed");
+	ipc_debugfs_init(ipc_imem);
 
 	ipc_task_queue_send_task(ipc_imem, ipc_imem_send_mdm_rdy_cb, 0, NULL, 0,
 				 false);
@@ -1173,7 +1172,7 @@ void ipc_imem_cleanup(struct iosm_imem *ipc_imem)
 
 	if (test_and_clear_bit(FULLY_FUNCTIONAL, &ipc_imem->flag)) {
 		ipc_mux_deinit(ipc_imem->mux);
-		ipc_trace_deinit(ipc_imem->trace);
+		ipc_debugfs_deinit(ipc_imem);
 		ipc_wwan_deinit(ipc_imem->wwan);
 		ipc_port_deinit(ipc_imem->ipc_port);
 	}

drivers/net/wwan/iosm/iosm_ipc_imem.h

@@ -341,6 +341,7 @@ enum ipc_phase {
  * @ev_mux_net_transmit_pending:0 means inform the IPC tasklet to pass
  * @reset_det_n:		Reset detect flag
  * @pcie_wake_n:		Pcie wake flag
+ * @debugfs_dir:		Debug FS directory for driver-specific entries
  */
 struct iosm_imem {
 	struct iosm_mmio *mmio;
@@ -380,6 +381,7 @@ struct iosm_imem {
 	   ev_mux_net_transmit_pending:1,
 	   reset_det_n:1,
 	   pcie_wake_n:1;
+	struct dentry *debugfs_dir;
 };
 
 /**

drivers/net/wwan/iosm/iosm_ipc_trace.c

@@ -134,7 +134,6 @@ struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem)
 {
 	struct ipc_chnl_cfg chnl_cfg = { 0 };
 	struct iosm_trace *ipc_trace;
-	struct dentry *debugfs_pdev;
 
 	ipc_chnl_cfg_get(&chnl_cfg, IPC_MEM_CTRL_CHL_ID_3);
 	ipc_imem_channel_init(ipc_imem, IPC_CTYPE_CTRL, chnl_cfg,
@@ -150,15 +149,14 @@ struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem)
 	ipc_trace->chl_id = IPC_MEM_CTRL_CHL_ID_3;
 
 	mutex_init(&ipc_trace->trc_mutex);
-	debugfs_pdev = wwan_get_debugfs_dir(ipc_imem->dev);
 
 	ipc_trace->ctrl_file = debugfs_create_file(IOSM_TRC_DEBUGFS_TRACE_CTRL,
 						   IOSM_TRC_FILE_PERM,
-						   debugfs_pdev,
+						   ipc_imem->debugfs_dir,
 						   ipc_trace, &ipc_trace_fops);
 
 	ipc_trace->ipc_rchan = relay_open(IOSM_TRC_DEBUGFS_TRACE,
-					  debugfs_pdev,
+					  ipc_imem->debugfs_dir,
 					  IOSM_TRC_SUB_BUFF_SIZE,
 					  IOSM_TRC_N_SUB_BUFF,
 					  &relay_callbacks, NULL);