* [PATCH net-next v2 1/4] net: wwan: iosm: consolidate trace port init code
2021-12-06 23:41 [PATCH net-next v2 0/4] WWAN debugfs tweaks Sergey Ryazanov
@ 2021-12-06 23:41 ` Sergey Ryazanov
2021-12-06 23:41 ` [PATCH net-next v2 2/4] net: wwan: iosm: allow trace port be uninitialized Sergey Ryazanov
` (3 subsequent siblings)
4 siblings, 0 replies; 7+ messages in thread
From: Sergey Ryazanov @ 2021-12-06 23:41 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski
Cc: netdev, M Chetan Kumar, Intel Corporation, Loic Poulain,
Johannes Berg, Leon Romanovsky
Move the channel related structures initialization from
ipc_imem_channel_init() to ipc_trace_init() and call it directly. On the
one hand, this makes the trace port initialization symmetric to the
deitialization, that is, it removes the additional wrapper.
On the other hand, this change consolidates the trace port related code
into a single source file, what facilitates an upcoming disabling of
this functionality by a user choise.
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
---
Changes since v1:
* no changes
drivers/net/wwan/iosm/iosm_ipc_imem.c | 2 +-
drivers/net/wwan/iosm/iosm_ipc_imem_ops.c | 18 ------------------
drivers/net/wwan/iosm/iosm_ipc_imem_ops.h | 2 +-
drivers/net/wwan/iosm/iosm_ipc_trace.c | 8 +++++++-
4 files changed, 9 insertions(+), 21 deletions(-)
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.c b/drivers/net/wwan/iosm/iosm_ipc_imem.c
index 1be07114c85d..49bdadb855e5 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_imem.c
@@ -554,7 +554,7 @@ static void ipc_imem_run_state_worker(struct work_struct *instance)
ctrl_chl_idx++;
}
- ipc_imem->trace = ipc_imem_trace_channel_init(ipc_imem);
+ ipc_imem->trace = ipc_trace_init(ipc_imem);
if (!ipc_imem->trace) {
dev_err(ipc_imem->dev, "trace channel init failed");
return;
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c
index 43f1796a8984..d2072a84ab08 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.c
@@ -11,7 +11,6 @@
#include "iosm_ipc_imem_ops.h"
#include "iosm_ipc_port.h"
#include "iosm_ipc_task_queue.h"
-#include "iosm_ipc_trace.h"
/* Open a packet data online channel between the network layer and CP. */
int ipc_imem_sys_wwan_open(struct iosm_imem *ipc_imem, int if_id)
@@ -108,23 +107,6 @@ void ipc_imem_wwan_channel_init(struct iosm_imem *ipc_imem,
"failed to register the ipc_wwan interfaces");
}
-/**
- * ipc_imem_trace_channel_init - Initializes trace channel.
- * @ipc_imem: Pointer to iosm_imem struct.
- *
- * Returns: Pointer to trace instance on success else NULL
- */
-struct iosm_trace *ipc_imem_trace_channel_init(struct iosm_imem *ipc_imem)
-{
- struct ipc_chnl_cfg chnl_cfg = { 0 };
-
- ipc_chnl_cfg_get(&chnl_cfg, IPC_MEM_CTRL_CHL_ID_3);
- ipc_imem_channel_init(ipc_imem, IPC_CTYPE_CTRL, chnl_cfg,
- IRQ_MOD_OFF);
-
- return ipc_trace_init(ipc_imem);
-}
-
/* Map SKB to DMA for transfer */
static int ipc_imem_map_skb_to_dma(struct iosm_imem *ipc_imem,
struct sk_buff *skb)
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h
index e36ee2782629..f8afb217d9e2 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h
+++ b/drivers/net/wwan/iosm/iosm_ipc_imem_ops.h
@@ -141,5 +141,5 @@ int ipc_imem_sys_devlink_read(struct iosm_devlink *ipc_devlink, u8 *data,
*/
int ipc_imem_sys_devlink_write(struct iosm_devlink *ipc_devlink,
unsigned char *buf, int count);
-struct iosm_trace *ipc_imem_trace_channel_init(struct iosm_imem *ipc_imem);
+
#endif
diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.c b/drivers/net/wwan/iosm/iosm_ipc_trace.c
index c5fa12599c2b..5f5cfd39bede 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_trace.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_trace.c
@@ -132,9 +132,15 @@ static const struct file_operations ipc_trace_fops = {
*/
struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem)
{
- struct iosm_trace *ipc_trace = kzalloc(sizeof(*ipc_trace), GFP_KERNEL);
+ 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,
+ IRQ_MOD_OFF);
+
+ ipc_trace = kzalloc(sizeof(*ipc_trace), GFP_KERNEL);
if (!ipc_trace)
return NULL;
--
2.32.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH net-next v2 2/4] net: wwan: iosm: allow trace port be uninitialized
2021-12-06 23:41 [PATCH net-next v2 0/4] WWAN debugfs tweaks Sergey Ryazanov
2021-12-06 23:41 ` [PATCH net-next v2 1/4] net: wwan: iosm: consolidate trace port init code Sergey Ryazanov
@ 2021-12-06 23:41 ` Sergey Ryazanov
2021-12-06 23:41 ` [PATCH net-next v2 3/4] net: wwan: iosm: move debugfs knobs into a subdir Sergey Ryazanov
` (2 subsequent siblings)
4 siblings, 0 replies; 7+ messages in thread
From: Sergey Ryazanov @ 2021-12-06 23:41 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski
Cc: netdev, M Chetan Kumar, Intel Corporation, Loic Poulain,
Johannes Berg, Leon Romanovsky
Collecting modem firmware traces is optional for the regular modem use.
There are not many reasons for aborting device initialization due to an
inability to initialize the trace port and (or) its debugfs interface.
So, demote the initialization failure erro message into a warning and do
not break the initialization sequence in this case. Rework packet
processing and deinitialization so that they do not crash in case of
uninitialized trace port.
This change is mainly a preparation for an upcoming configuration option
introduction that will help disable driver debugfs functionality.
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
---
Changes since v1:
* no changes
drivers/net/wwan/iosm/iosm_ipc_imem.c | 8 +++-----
drivers/net/wwan/iosm/iosm_ipc_trace.c | 3 +++
drivers/net/wwan/iosm/iosm_ipc_trace.h | 5 +++++
3 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.c b/drivers/net/wwan/iosm/iosm_ipc_imem.c
index 49bdadb855e5..a60b93cefd2e 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_imem.c
@@ -272,7 +272,7 @@ static void ipc_imem_dl_skb_process(struct iosm_imem *ipc_imem,
if (port_id == IPC_MEM_CTRL_CHL_ID_7)
ipc_imem_sys_devlink_notify_rx(ipc_imem->ipc_devlink,
skb);
- else if (port_id == ipc_imem->trace->chl_id)
+ else if (ipc_is_trace_channel(ipc_imem, port_id))
ipc_trace_port_rx(ipc_imem->trace, skb);
else
wwan_port_rx(ipc_imem->ipc_port[port_id]->iosm_port,
@@ -555,10 +555,8 @@ static void ipc_imem_run_state_worker(struct work_struct *instance)
}
ipc_imem->trace = ipc_trace_init(ipc_imem);
- if (!ipc_imem->trace) {
- dev_err(ipc_imem->dev, "trace channel init failed");
- return;
- }
+ if (!ipc_imem->trace)
+ dev_warn(ipc_imem->dev, "trace channel init failed");
ipc_task_queue_send_task(ipc_imem, ipc_imem_send_mdm_rdy_cb, 0, NULL, 0,
false);
diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.c b/drivers/net/wwan/iosm/iosm_ipc_trace.c
index 5f5cfd39bede..c588a394cd94 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_trace.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_trace.c
@@ -172,6 +172,9 @@ struct iosm_trace *ipc_trace_init(struct iosm_imem *ipc_imem)
*/
void ipc_trace_deinit(struct iosm_trace *ipc_trace)
{
+ if (!ipc_trace)
+ return;
+
debugfs_remove(ipc_trace->ctrl_file);
relay_close(ipc_trace->ipc_rchan);
mutex_destroy(&ipc_trace->trc_mutex);
diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.h b/drivers/net/wwan/iosm/iosm_ipc_trace.h
index 53346183af9c..419540c91219 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_trace.h
+++ b/drivers/net/wwan/iosm/iosm_ipc_trace.h
@@ -45,6 +45,11 @@ struct iosm_trace {
enum trace_ctrl_mode mode;
};
+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);
--
2.32.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH net-next v2 3/4] net: wwan: iosm: move debugfs knobs into a subdir
2021-12-06 23:41 [PATCH net-next v2 0/4] WWAN debugfs tweaks Sergey Ryazanov
2021-12-06 23:41 ` [PATCH net-next v2 1/4] net: wwan: iosm: consolidate trace port init code Sergey Ryazanov
2021-12-06 23:41 ` [PATCH net-next v2 2/4] net: wwan: iosm: allow trace port be uninitialized Sergey Ryazanov
@ 2021-12-06 23:41 ` Sergey Ryazanov
2021-12-06 23:41 ` [PATCH net-next v2 4/4] net: wwan: make debugfs optional Sergey Ryazanov
2021-12-07 0:13 ` [PATCH net-next v2 0/4] WWAN debugfs tweaks Jakub Kicinski
4 siblings, 0 replies; 7+ messages in thread
From: Sergey Ryazanov @ 2021-12-06 23:41 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski
Cc: netdev, M Chetan Kumar, Intel Corporation, Loic Poulain,
Johannes Berg, Leon Romanovsky
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>
---
Changes since v1:
* add missed description for a new structure field 'debugfs_dir'
drivers/net/wwan/iosm/Makefile | 1 +
drivers/net/wwan/iosm/iosm_ipc_debugfs.c | 29 ++++++++++++++++++++++++
drivers/net/wwan/iosm/iosm_ipc_debugfs.h | 12 ++++++++++
drivers/net/wwan/iosm/iosm_ipc_imem.c | 7 +++---
drivers/net/wwan/iosm/iosm_ipc_imem.h | 2 ++
drivers/net/wwan/iosm/iosm_ipc_trace.c | 6 ++---
6 files changed, 49 insertions(+), 8 deletions(-)
create mode 100644 drivers/net/wwan/iosm/iosm_ipc_debugfs.c
create mode 100644 drivers/net/wwan/iosm/iosm_ipc_debugfs.h
diff --git a/drivers/net/wwan/iosm/Makefile b/drivers/net/wwan/iosm/Makefile
index 5c2528beca2a..5091f664af0d 100644
--- a/drivers/net/wwan/iosm/Makefile
+++ b/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
diff --git a/drivers/net/wwan/iosm/iosm_ipc_debugfs.c b/drivers/net/wwan/iosm/iosm_ipc_debugfs.c
new file mode 100644
index 000000000000..f2f57751a7d2
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_debugfs.c
@@ -0,0 +1,29 @@
+// 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);
+}
diff --git a/drivers/net/wwan/iosm/iosm_ipc_debugfs.h b/drivers/net/wwan/iosm/iosm_ipc_debugfs.h
new file mode 100644
index 000000000000..35788039f13f
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_debugfs.h
@@ -0,0 +1,12 @@
+/* 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
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.c b/drivers/net/wwan/iosm/iosm_ipc_imem.c
index a60b93cefd2e..25b889922912 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.c
+++ b/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);
}
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.h b/drivers/net/wwan/iosm/iosm_ipc_imem.h
index cec38009c44a..1b8c7b8959c6 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.h
+++ b/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;
};
/**
diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.c b/drivers/net/wwan/iosm/iosm_ipc_trace.c
index c588a394cd94..5243ead90b5f 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_trace.c
+++ b/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);
--
2.32.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH net-next v2 4/4] net: wwan: make debugfs optional
2021-12-06 23:41 [PATCH net-next v2 0/4] WWAN debugfs tweaks Sergey Ryazanov
` (2 preceding siblings ...)
2021-12-06 23:41 ` [PATCH net-next v2 3/4] net: wwan: iosm: move debugfs knobs into a subdir Sergey Ryazanov
@ 2021-12-06 23:41 ` Sergey Ryazanov
2021-12-07 8:00 ` Leon Romanovsky
2021-12-07 0:13 ` [PATCH net-next v2 0/4] WWAN debugfs tweaks Jakub Kicinski
4 siblings, 1 reply; 7+ messages in thread
From: Sergey Ryazanov @ 2021-12-06 23:41 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski
Cc: netdev, M Chetan Kumar, Intel Corporation, Loic Poulain,
Johannes Berg, Leon Romanovsky
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>
---
Changes since v1:
* this is a merge of 4th and 5th patches
* drop the IOSM specific configuration option and use the common WWAN
option to control the IOSM debugfs interface build, thanks to Johannes
and Leon for their recomendations
* make WWAN debugfs enabled by default and hide it under EXPERT as
suggested by Johannes
* add a detailed rationale to the patch description to show why we need
the ability to disable debugfs
* return ERR_PTR(-ENODEV) instead of NULL if WWAN debugfs was disabled,
thanks to Johannes for spotting this
* fix unused 'wwandev_name' variable warning
* expand the new configuration symbold description
drivers/net/wwan/Kconfig | 13 ++++++++++++-
drivers/net/wwan/iosm/Makefile | 4 +++-
drivers/net/wwan/iosm/iosm_ipc_debugfs.h | 5 +++++
drivers/net/wwan/iosm/iosm_ipc_imem.c | 2 +-
drivers/net/wwan/iosm/iosm_ipc_imem.h | 4 ++++
drivers/net/wwan/iosm/iosm_ipc_trace.c | 6 ++++--
drivers/net/wwan/iosm/iosm_ipc_trace.h | 20 +++++++++++++++++++-
drivers/net/wwan/wwan_core.c | 17 +++++++++++++----
include/linux/wwan.h | 7 +++++++
9 files changed, 68 insertions(+), 10 deletions(-)
diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig
index 9f5111a77da9..609fd4a2c865 100644
--- a/drivers/net/wwan/Kconfig
+++ b/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.
diff --git a/drivers/net/wwan/iosm/Makefile b/drivers/net/wwan/iosm/Makefile
index 5091f664af0d..fa8d6afd18e1 100644
--- a/drivers/net/wwan/iosm/Makefile
+++ b/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
diff --git a/drivers/net/wwan/iosm/iosm_ipc_debugfs.h b/drivers/net/wwan/iosm/iosm_ipc_debugfs.h
index 35788039f13f..8a84bfa2c14a 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_debugfs.h
+++ b/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
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.c b/drivers/net/wwan/iosm/iosm_ipc_imem.c
index 25b889922912..2a6ddd7c6c88 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.c
+++ b/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);
diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.h b/drivers/net/wwan/iosm/iosm_ipc_imem.h
index 1b8c7b8959c6..86a1ffe61729 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.h
+++ b/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
};
/**
diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.c b/drivers/net/wwan/iosm/iosm_ipc_trace.c
index 5243ead90b5f..eeecfa3d10c5 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_trace.c
+++ b/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);
diff --git a/drivers/net/wwan/iosm/iosm_ipc_trace.h b/drivers/net/wwan/iosm/iosm_ipc_trace.h
index 419540c91219..5ebe7790585c 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_trace.h
+++ b/drivers/net/wwan/iosm/iosm_ipc_trace.h
@@ -45,6 +45,8 @@ 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;
@@ -52,5 +54,21 @@ static inline bool ipc_is_trace_channel(struct iosm_imem *ipc_mem, u16 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
diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
index 5bf62dc35ac7..1508dc2a497b 100644
--- a/drivers/net/wwan/wwan_core.c
+++ b/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;
diff --git a/include/linux/wwan.h b/include/linux/wwan.h
index 1646aa3e6779..e143c88bf4b0 100644
--- a/include/linux/wwan.h
+++ b/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 */
--
2.32.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH net-next v2 4/4] net: wwan: make debugfs optional
2021-12-06 23:41 ` [PATCH net-next v2 4/4] net: wwan: make debugfs optional Sergey Ryazanov
@ 2021-12-07 8:00 ` Leon Romanovsky
0 siblings, 0 replies; 7+ messages in thread
From: Leon Romanovsky @ 2021-12-07 8:00 UTC (permalink / raw)
To: Sergey Ryazanov
Cc: David S . Miller, Jakub Kicinski, netdev, M Chetan Kumar,
Intel Corporation, Loic Poulain, Johannes Berg
On Tue, Dec 07, 2021 at 02:41:55AM +0300, Sergey Ryazanov wrote:
> 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>
> ---
Thanks,
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net-next v2 0/4] WWAN debugfs tweaks
2021-12-06 23:41 [PATCH net-next v2 0/4] WWAN debugfs tweaks Sergey Ryazanov
` (3 preceding siblings ...)
2021-12-06 23:41 ` [PATCH net-next v2 4/4] net: wwan: make debugfs optional Sergey Ryazanov
@ 2021-12-07 0:13 ` Jakub Kicinski
4 siblings, 0 replies; 7+ messages in thread
From: Jakub Kicinski @ 2021-12-07 0:13 UTC (permalink / raw)
To: Sergey Ryazanov
Cc: David S . Miller, netdev, M Chetan Kumar, Intel Corporation,
Loic Poulain, Johannes Berg, Leon Romanovsky
On Tue, 7 Dec 2021 02:41:51 +0300 Sergey Ryazanov wrote:
> The 4th patch should be applied after the Arnd Bergmann fix for the
> relayfs support selection [2].
Please repost once the dependency is merged, buildbots can't deal
with dependencies.
^ permalink raw reply [flat|nested] 7+ messages in thread