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i2400m: debugfs controls

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Expose knobs to control the device (induce reset, power saving,
querying tx or rx stats, internal debug information and debug level
manipulation).

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Inaky Perez-Gonzalez 2008-12-20 16:57:49 -08:00 committed by Greg Kroah-Hartman
parent 3a35a1d0bd
commit c71228caf9
1 changed files with 392 additions and 0 deletions
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392
drivers/net/wimax/i2400m/debugfs.c Normal file
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/*
* Intel Wireless WiMAX Connection 2400m
* Debugfs interfaces to manipulate driver and device information
*
*
* Copyright (C) 2007 Intel Corporation <linux-wimax@intel.com>
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/debugfs.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include "i2400m.h"
#define D_SUBMODULE debugfs
#include "debug-levels.h"
static
int debugfs_netdev_queue_stopped_get(void *data, u64 *val)
{
struct i2400m *i2400m = data;
*val = netif_queue_stopped(i2400m->wimax_dev.net_dev);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(fops_netdev_queue_stopped,
debugfs_netdev_queue_stopped_get,
NULL, "%llu\n");
static
struct dentry *debugfs_create_netdev_queue_stopped(
const char *name, struct dentry *parent, struct i2400m *i2400m)
{
return debugfs_create_file(name, 0400, parent, i2400m,
&fops_netdev_queue_stopped);
}
/*
* inode->i_private has the @data argument to debugfs_create_file()
*/
static
int i2400m_stats_open(struct inode *inode, struct file *filp)
{
filp->private_data = inode->i_private;
return 0;
}
/*
* We don't allow partial reads of this file, as then the reader would
* get weirdly confused data as it is updated.
*
* So or you read it all or nothing; if you try to read with an offset
* != 0, we consider you are done reading.
*/
static
ssize_t i2400m_rx_stats_read(struct file *filp, char __user *buffer,
size_t count, loff_t *ppos)
{
struct i2400m *i2400m = filp->private_data;
char buf[128];
unsigned long flags;
if (*ppos != 0)
return 0;
if (count < sizeof(buf))
return -ENOSPC;
spin_lock_irqsave(&i2400m->rx_lock, flags);
snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
i2400m->rx_pl_num, i2400m->rx_pl_min,
i2400m->rx_pl_max, i2400m->rx_num,
i2400m->rx_size_acc,
i2400m->rx_size_min, i2400m->rx_size_max);
spin_unlock_irqrestore(&i2400m->rx_lock, flags);
return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
}
/* Any write clears the stats */
static
ssize_t i2400m_rx_stats_write(struct file *filp, const char __user *buffer,
size_t count, loff_t *ppos)
{
struct i2400m *i2400m = filp->private_data;
unsigned long flags;
spin_lock_irqsave(&i2400m->rx_lock, flags);
i2400m->rx_pl_num = 0;
i2400m->rx_pl_max = 0;
i2400m->rx_pl_min = UINT_MAX;
i2400m->rx_num = 0;
i2400m->rx_size_acc = 0;
i2400m->rx_size_min = UINT_MAX;
i2400m->rx_size_max = 0;
spin_unlock_irqrestore(&i2400m->rx_lock, flags);
return count;
}
static
const struct file_operations i2400m_rx_stats_fops = {
.owner = THIS_MODULE,
.open = i2400m_stats_open,
.read = i2400m_rx_stats_read,
.write = i2400m_rx_stats_write,
};
/* See i2400m_rx_stats_read() */
static
ssize_t i2400m_tx_stats_read(struct file *filp, char __user *buffer,
size_t count, loff_t *ppos)
{
struct i2400m *i2400m = filp->private_data;
char buf[128];
unsigned long flags;
if (*ppos != 0)
return 0;
if (count < sizeof(buf))
return -ENOSPC;
spin_lock_irqsave(&i2400m->tx_lock, flags);
snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
i2400m->tx_pl_num, i2400m->tx_pl_min,
i2400m->tx_pl_max, i2400m->tx_num,
i2400m->tx_size_acc,
i2400m->tx_size_min, i2400m->tx_size_max);
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
}
/* Any write clears the stats */
static
ssize_t i2400m_tx_stats_write(struct file *filp, const char __user *buffer,
size_t count, loff_t *ppos)
{
struct i2400m *i2400m = filp->private_data;
unsigned long flags;
spin_lock_irqsave(&i2400m->tx_lock, flags);
i2400m->tx_pl_num = 0;
i2400m->tx_pl_max = 0;
i2400m->tx_pl_min = UINT_MAX;
i2400m->tx_num = 0;
i2400m->tx_size_acc = 0;
i2400m->tx_size_min = UINT_MAX;
i2400m->tx_size_max = 0;
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
return count;
}
static
const struct file_operations i2400m_tx_stats_fops = {
.owner = THIS_MODULE,
.open = i2400m_stats_open,
.read = i2400m_tx_stats_read,
.write = i2400m_tx_stats_write,
};
/* Write 1 to ask the device to go into suspend */
static
int debugfs_i2400m_suspend_set(void *data, u64 val)
{
int result;
struct i2400m *i2400m = data;
result = i2400m_cmd_enter_powersave(i2400m);
if (result >= 0)
result = 0;
return result;
}
DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_suspend,
NULL, debugfs_i2400m_suspend_set,
"%llu\n");
static
struct dentry *debugfs_create_i2400m_suspend(
const char *name, struct dentry *parent, struct i2400m *i2400m)
{
return debugfs_create_file(name, 0200, parent, i2400m,
&fops_i2400m_suspend);
}
/*
* Reset the device
*
* Write 0 to ask the device to soft reset, 1 to cold reset, 2 to bus
* reset (as defined by enum i2400m_reset_type).
*/
static
int debugfs_i2400m_reset_set(void *data, u64 val)
{
int result;
struct i2400m *i2400m = data;
enum i2400m_reset_type rt = val;
switch(rt) {
case I2400M_RT_WARM:
case I2400M_RT_COLD:
case I2400M_RT_BUS:
result = i2400m->bus_reset(i2400m, rt);
if (result >= 0)
result = 0;
default:
result = -EINVAL;
}
return result;
}
DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_reset,
NULL, debugfs_i2400m_reset_set,
"%llu\n");
static
struct dentry *debugfs_create_i2400m_reset(
const char *name, struct dentry *parent, struct i2400m *i2400m)
{
return debugfs_create_file(name, 0200, parent, i2400m,
&fops_i2400m_reset);
}
/*
* Debug levels control; see debug.h
*/
struct d_level D_LEVEL[] = {
D_SUBMODULE_DEFINE(control),
D_SUBMODULE_DEFINE(driver),
D_SUBMODULE_DEFINE(debugfs),
D_SUBMODULE_DEFINE(fw),
D_SUBMODULE_DEFINE(netdev),
D_SUBMODULE_DEFINE(rfkill),
D_SUBMODULE_DEFINE(rx),
D_SUBMODULE_DEFINE(tx),
};
size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
#define __debugfs_register(prefix, name, parent) \
do { \
result = d_level_register_debugfs(prefix, name, parent); \
if (result < 0) \
goto error; \
} while (0)
int i2400m_debugfs_add(struct i2400m *i2400m)
{
int result;
struct device *dev = i2400m_dev(i2400m);
struct dentry *dentry = i2400m->wimax_dev.debugfs_dentry;
struct dentry *fd;
dentry = debugfs_create_dir("i2400m", dentry);
result = PTR_ERR(dentry);
if (IS_ERR(dentry)) {
if (result == -ENODEV)
result = 0; /* No debugfs support */
goto error;
}
i2400m->debugfs_dentry = dentry;
__debugfs_register("dl_", control, dentry);
__debugfs_register("dl_", driver, dentry);
__debugfs_register("dl_", debugfs, dentry);
__debugfs_register("dl_", fw, dentry);
__debugfs_register("dl_", netdev, dentry);
__debugfs_register("dl_", rfkill, dentry);
__debugfs_register("dl_", rx, dentry);
__debugfs_register("dl_", tx, dentry);
fd = debugfs_create_size_t("tx_in", 0400, dentry,
&i2400m->tx_in);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"tx_in: %d\n", result);
goto error;
}
fd = debugfs_create_size_t("tx_out", 0400, dentry,
&i2400m->tx_out);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"tx_out: %d\n", result);
goto error;
}
fd = debugfs_create_u32("state", 0600, dentry,
&i2400m->state);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"state: %d\n", result);
goto error;
}
/*
* Trace received messages from user space
*
* In order to tap the bidirectional message stream in the
* 'msg' pipe, user space can read from the 'msg' pipe;
* however, due to limitations in libnl, we can't know what
* the different applications are sending down to the kernel.
*
* So we have this hack where the driver will echo any message
* received on the msg pipe from user space [through a call to
* wimax_dev->op_msg_from_user() into
* i2400m_op_msg_from_user()] into the 'trace' pipe that this
* driver creates.
*
* So then, reading from both the 'trace' and 'msg' pipes in
* user space will provide a full dump of the traffic.
*
* Write 1 to activate, 0 to clear.
*
* It is not really very atomic, but it is also not too
* critical.
*/
fd = debugfs_create_u8("trace_msg_from_user", 0600, dentry,
&i2400m->trace_msg_from_user);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"trace_msg_from_user: %d\n", result);
goto error;
}
fd = debugfs_create_netdev_queue_stopped("netdev_queue_stopped",
dentry, i2400m);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"netdev_queue_stopped: %d\n", result);
goto error;
}
fd = debugfs_create_file("rx_stats", 0600, dentry, i2400m,
&i2400m_rx_stats_fops);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"rx_stats: %d\n", result);
goto error;
}
fd = debugfs_create_file("tx_stats", 0600, dentry, i2400m,
&i2400m_tx_stats_fops);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry "
"tx_stats: %d\n", result);
goto error;
}
fd = debugfs_create_i2400m_suspend("suspend", dentry, i2400m);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry suspend: %d\n",
result);
goto error;
}
fd = debugfs_create_i2400m_reset("reset", dentry, i2400m);
result = PTR_ERR(fd);
if (IS_ERR(fd) && result != -ENODEV) {
dev_err(dev, "Can't create debugfs entry reset: %d\n", result);
goto error;
}
result = 0;
error:
return result;
}
void i2400m_debugfs_rm(struct i2400m *i2400m)
{
debugfs_remove_recursive(i2400m->debugfs_dentry);
}