net: wwan: make debugfs optional

Debugfs interface is optional for the regular modem use. Some distros
and users will want to disable this feature for security or kernel
size reasons. So add a configuration option that allows to completely
disable the debugfs interface of the WWAN devices.

A primary considered use case for this option was embedded firmwares.
For example, in OpenWrt, you can not completely disable debugfs, as a
lot of wireless stuff can only be configured and monitored with the
debugfs knobs. At the same time, reducing the size of a kernel and
modules is an essential task in the world of embedded software.
Disabling the WWAN and IOSM debugfs interfaces allows us to save 50K
(x86-64 build) of space for module storage. Not much, but already
considerable when you only have 16MB of storage.

So it is hard to just disable whole debugfs. Users need some fine
grained set of options to control which debugfs interface is important
and should be available and which is not.

The new configuration symbol is enabled by default and is hidden under
the EXPERT option. So a regular user would not be bothered by another
one configuration question. While an embedded distro maintainer will be
able to a little more reduce the final image size.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.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/Kconfig

@@ -16,6 +16,17 @@ config WWAN
 
 if WWAN
 
+config WWAN_DEBUGFS
+	bool "WWAN devices debugfs interface" if EXPERT
+	depends on DEBUG_FS
+	default y
+	help
+	  Enables debugfs infrastructure for the WWAN core and device drivers.
+
+	  If this option is selected, then you can find the debug interface
+	  elements for each WWAN device in a directory that is corresponding to
+	  the device name: debugfs/wwan/wwanX.
+
 config WWAN_HWSIM
 	tristate "Simulated WWAN device"
 	help
@@ -85,7 +96,7 @@ config IOSM
 	tristate "IOSM Driver for Intel M.2 WWAN Device"
 	depends on INTEL_IOMMU
 	select NET_DEVLINK
-	select RELAY
+	select RELAY if WWAN_DEBUGFS
 	help
 	  This driver enables Intel M.2 WWAN Device communication.
 

drivers/net/wwan/iosm/Makefile

@@ -21,7 +21,9 @@ iosm-y = \
 	iosm_ipc_mux_codec.o		\
 	iosm_ipc_devlink.o		\
 	iosm_ipc_flash.o		\
-	iosm_ipc_coredump.o		\
+	iosm_ipc_coredump.o
+
+iosm-$(CONFIG_WWAN_DEBUGFS) += \
 	iosm_ipc_debugfs.o		\
 	iosm_ipc_trace.o
 

drivers/net/wwan/iosm/iosm_ipc_debugfs.h

@@ -6,7 +6,12 @@
 #ifndef IOSM_IPC_DEBUGFS_H
 #define IOSM_IPC_DEBUGFS_H
 
+#ifdef CONFIG_WWAN_DEBUGFS
 void ipc_debugfs_init(struct iosm_imem *ipc_imem);
 void ipc_debugfs_deinit(struct iosm_imem *ipc_imem);
+#else
+static inline void ipc_debugfs_init(struct iosm_imem *ipc_imem) {}
+static inline void ipc_debugfs_deinit(struct iosm_imem *ipc_imem) {}
+#endif
 
 #endif

drivers/net/wwan/iosm/iosm_ipc_imem.c

@@ -274,7 +274,7 @@ static void ipc_imem_dl_skb_process(struct iosm_imem *ipc_imem,
 			ipc_imem_sys_devlink_notify_rx(ipc_imem->ipc_devlink,
 						       skb);
 		else if (ipc_is_trace_channel(ipc_imem, port_id))
-			ipc_trace_port_rx(ipc_imem->trace, skb);
+			ipc_trace_port_rx(ipc_imem, skb);
 		else
 			wwan_port_rx(ipc_imem->ipc_port[port_id]->iosm_port,
 				     skb);

drivers/net/wwan/iosm/iosm_ipc_imem.h

@@ -351,7 +351,9 @@ struct iosm_imem {
 	struct iosm_mux *mux;
 	struct iosm_cdev *ipc_port[IPC_MEM_MAX_CHANNELS];
 	struct iosm_pcie *pcie;
+#ifdef CONFIG_WWAN_DEBUGFS
 	struct iosm_trace *trace;
+#endif
 	struct device *dev;
 	enum ipc_mem_device_ipc_state ipc_requested_state;
 	struct ipc_mem_channel channels[IPC_MEM_MAX_CHANNELS];
@@ -381,7 +383,9 @@ struct iosm_imem {
 	   ev_mux_net_transmit_pending:1,
 	   reset_det_n:1,
 	   pcie_wake_n:1;
+#ifdef CONFIG_WWAN_DEBUGFS
 	struct dentry *debugfs_dir;
+#endif
 };
 
 /**

drivers/net/wwan/iosm/iosm_ipc_trace.c

@@ -17,11 +17,13 @@
 
 /**
  * ipc_trace_port_rx - Receive trace packet from cp and write to relay buffer
- * @ipc_trace:  Pointer to the ipc trace data-struct
+ * @ipc_imem:   Pointer to iosm_imem structure
  * @skb:        Pointer to struct sk_buff
  */
-void ipc_trace_port_rx(struct iosm_trace *ipc_trace, struct sk_buff *skb)
+void ipc_trace_port_rx(struct iosm_imem *ipc_imem, struct sk_buff *skb)
 {
+	struct iosm_trace *ipc_trace = ipc_imem->trace;
+
 	if (ipc_trace->ipc_rchan)
 		relay_write(ipc_trace->ipc_rchan, skb->data, skb->len);
 

drivers/net/wwan/iosm/iosm_ipc_trace.h

@@ -45,12 +45,30 @@ struct iosm_trace {
 	enum trace_ctrl_mode mode;
 };
 
+#ifdef CONFIG_WWAN_DEBUGFS
+
 static inline bool ipc_is_trace_channel(struct iosm_imem *ipc_mem, u16 chl_id)
 {
 	return ipc_mem->trace && ipc_mem->trace->chl_id == chl_id;
 }
 
 struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem);
 void ipc_trace_deinit(struct iosm_trace *ipc_trace);
-void ipc_trace_port_rx(struct iosm_trace *ipc_trace, struct sk_buff *skb);
+void ipc_trace_port_rx(struct iosm_imem *ipc_imem, struct sk_buff *skb);
+
+#else
+
+static inline bool ipc_is_trace_channel(struct iosm_imem *ipc_mem, u16 chl_id)
+{
+	return false;
+}
+
+static inline void ipc_trace_port_rx(struct iosm_imem *ipc_imem,
+				     struct sk_buff *skb)
+{
+	dev_kfree_skb(skb);
+}
+
+#endif
+
 #endif

drivers/net/wwan/wwan_core.c

@@ -50,7 +50,9 @@ struct wwan_device {
 	atomic_t port_id;
 	const struct wwan_ops *ops;
 	void *ops_ctxt;
+#ifdef CONFIG_WWAN_DEBUGFS
 	struct dentry *debugfs_dir;
+#endif
 };
 
 /**
@@ -146,6 +148,7 @@ static struct wwan_device *wwan_dev_get_by_name(const char *name)
 	return to_wwan_dev(dev);
 }
 
+#ifdef CONFIG_WWAN_DEBUGFS
 struct dentry *wwan_get_debugfs_dir(struct device *parent)
 {
 	struct wwan_device *wwandev;
@@ -157,6 +160,7 @@ struct dentry *wwan_get_debugfs_dir(struct device *parent)
 	return wwandev->debugfs_dir;
 }
 EXPORT_SYMBOL_GPL(wwan_get_debugfs_dir);
+#endif
 
 /* This function allocates and registers a new WWAN device OR if a WWAN device
  * already exist for the given parent, it gets a reference and return it.
@@ -166,7 +170,6 @@ EXPORT_SYMBOL_GPL(wwan_get_debugfs_dir);
 static struct wwan_device *wwan_create_dev(struct device *parent)
 {
 	struct wwan_device *wwandev;
-	const char *wwandev_name;
 	int err, id;
 
 	/* The 'find-alloc-register' operation must be protected against
@@ -206,9 +209,11 @@ static struct wwan_device *wwan_create_dev(struct device *parent)
 		goto done_unlock;
 	}
 
-	wwandev_name = kobject_name(&wwandev->dev.kobj);
-	wwandev->debugfs_dir = debugfs_create_dir(wwandev_name,
-						  wwan_debugfs_dir);
+#ifdef CONFIG_WWAN_DEBUGFS
+	wwandev->debugfs_dir =
+			debugfs_create_dir(kobject_name(&wwandev->dev.kobj),
+					   wwan_debugfs_dir);
+#endif
 
 done_unlock:
 	mutex_unlock(&wwan_register_lock);
@@ -240,7 +245,9 @@ static void wwan_remove_dev(struct wwan_device *wwandev)
 		ret = device_for_each_child(&wwandev->dev, NULL, is_wwan_child);
 
 	if (!ret) {
+#ifdef CONFIG_WWAN_DEBUGFS
 		debugfs_remove_recursive(wwandev->debugfs_dir);
+#endif
 		device_unregister(&wwandev->dev);
 	} else {
 		put_device(&wwandev->dev);
@@ -1140,7 +1147,9 @@ static int __init wwan_init(void)
 		goto destroy;
 	}
 
+#ifdef CONFIG_WWAN_DEBUGFS
 	wwan_debugfs_dir = debugfs_create_dir("wwan", NULL);
+#endif
 
 	return 0;
 

include/linux/wwan.h

@@ -171,6 +171,13 @@ int wwan_register_ops(struct device *parent, const struct wwan_ops *ops,
 
 void wwan_unregister_ops(struct device *parent);
 
+#ifdef CONFIG_WWAN_DEBUGFS
 struct dentry *wwan_get_debugfs_dir(struct device *parent);
+#else
+static inline struct dentry *wwan_get_debugfs_dir(struct device *parent)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
 
 #endif /* __WWAN_H */