M Chetan Kumar 00ef32565b net: wwan: iosm: device trace collection using relayfs
This patch brings in support for device trace collection.
It implements relayfs interface for pushing device trace
from kernel space to user space.

Driver gets the debugfs base directory associated to WWAN
Device and creates trace_control and trace debugfs for
device tracing. Both trace_control & trace debugfs are
created under /sys/kernel/debug/wwan/wwan0/.

In order to collect device trace on trace0 interface, user
need to write 1 to trace_ctl interface.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-11-22 13:23:08 +00:00

86 lines
2.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020-21 Intel Corporation.
*/
#include "iosm_ipc_chnl_cfg.h"
#include "iosm_ipc_imem_ops.h"
#include "iosm_ipc_port.h"
/* open logical channel for control communication */
static int ipc_port_ctrl_start(struct wwan_port *port)
{
struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
int ret = 0;
ipc_port->channel = ipc_imem_sys_port_open(ipc_port->ipc_imem,
ipc_port->chl_id,
IPC_HP_CDEV_OPEN);
if (!ipc_port->channel)
ret = -EIO;
return ret;
}
/* close logical channel */
static void ipc_port_ctrl_stop(struct wwan_port *port)
{
struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
ipc_imem_sys_port_close(ipc_port->ipc_imem, ipc_port->channel);
}
/* transfer control data to modem */
static int ipc_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
{
struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
return ipc_imem_sys_cdev_write(ipc_port, skb);
}
static const struct wwan_port_ops ipc_wwan_ctrl_ops = {
.start = ipc_port_ctrl_start,
.stop = ipc_port_ctrl_stop,
.tx = ipc_port_ctrl_tx,
};
/* Port init func */
struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,
struct ipc_chnl_cfg ipc_port_cfg)
{
struct iosm_cdev *ipc_port = kzalloc(sizeof(*ipc_port), GFP_KERNEL);
enum wwan_port_type port_type = ipc_port_cfg.wwan_port_type;
enum ipc_channel_id chl_id = ipc_port_cfg.id;
if (!ipc_port)
return NULL;
ipc_port->dev = ipc_imem->dev;
ipc_port->pcie = ipc_imem->pcie;
ipc_port->port_type = port_type;
ipc_port->chl_id = chl_id;
ipc_port->ipc_imem = ipc_imem;
ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type,
&ipc_wwan_ctrl_ops, ipc_port);
return ipc_port;
}
/* Port deinit func */
void ipc_port_deinit(struct iosm_cdev *port[])
{
struct iosm_cdev *ipc_port;
u8 ctrl_chl_nr;
for (ctrl_chl_nr = 0; ctrl_chl_nr < IPC_MEM_MAX_CHANNELS;
ctrl_chl_nr++) {
if (port[ctrl_chl_nr]) {
ipc_port = port[ctrl_chl_nr];
wwan_remove_port(ipc_port->iosm_port);
kfree(ipc_port);
}
}
}