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mei: export active connections to debugfs

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Export active connection state to debugfs
The information displayed is [me,host] id pair,
client connection state, and client's read and write states

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2014-01-14 23:21:41 +02:00 committed by Greg Kroah-Hartman
parent 7d93e58d53
commit 5baaf71fb0
1 changed files with 54 additions and 0 deletions
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54
drivers/misc/mei/debugfs.c
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@ -75,6 +75,54 @@ static const struct file_operations mei_dbgfs_fops_meclients = {
.llseek = generic_file_llseek,
};
static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct mei_device *dev = fp->private_data;
struct mei_cl *cl;
const size_t bufsz = 1024;
char *buf;
int i = 0;
int pos = 0;
int ret;
if (!dev)
return -ENODEV;
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pos += scnprintf(buf + pos, bufsz - pos,
" |me|host|state|rd|wr|\n");
mutex_lock(&dev->device_lock);
/* if the driver is not enabled the list won't b consitent */
if (dev->dev_state != MEI_DEV_ENABLED)
goto out;
list_for_each_entry(cl, &dev->file_list, link) {
pos += scnprintf(buf + pos, bufsz - pos,
"%2d|%2d|%4d|%5d|%2d|%2d|\n",
i, cl->me_client_id, cl->host_client_id, cl->state,
cl->reading_state, cl->writing_state);
i++;
}
out:
mutex_unlock(&dev->device_lock);
ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
kfree(buf);
return ret;
}
static const struct file_operations mei_dbgfs_fops_active = {
.open = simple_open,
.read = mei_dbgfs_read_active,
.llseek = generic_file_llseek,
};
static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
@ -128,6 +176,12 @@ int mei_dbgfs_register(struct mei_device *dev, const char *name)
dev_err(&dev->pdev->dev, "meclients: registration failed\n");
goto err;
}
f = debugfs_create_file("active", S_IRUSR, dir,
dev, &mei_dbgfs_fops_active);
if (!f) {
dev_err(&dev->pdev->dev, "meclients: registration failed\n");
goto err;
}
f = debugfs_create_file("devstate", S_IRUSR, dir,
dev, &mei_dbgfs_fops_devstate);
if (!f) {