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mei: export active connections to debugfs
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>
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1 changed files with 54 additions and 0 deletions
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@ -75,6 +75,54 @@ static const struct file_operations mei_dbgfs_fops_meclients = {
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.llseek = generic_file_llseek,
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};
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static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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struct mei_device *dev = fp->private_data;
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struct mei_cl *cl;
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const size_t bufsz = 1024;
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char *buf;
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int i = 0;
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int pos = 0;
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int ret;
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if (!dev)
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return -ENODEV;
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buf = kzalloc(bufsz, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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pos += scnprintf(buf + pos, bufsz - pos,
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" |me|host|state|rd|wr|\n");
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mutex_lock(&dev->device_lock);
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/* if the driver is not enabled the list won't b consitent */
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if (dev->dev_state != MEI_DEV_ENABLED)
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goto out;
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list_for_each_entry(cl, &dev->file_list, link) {
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pos += scnprintf(buf + pos, bufsz - pos,
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"%2d|%2d|%4d|%5d|%2d|%2d|\n",
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i, cl->me_client_id, cl->host_client_id, cl->state,
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cl->reading_state, cl->writing_state);
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i++;
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}
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out:
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mutex_unlock(&dev->device_lock);
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ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
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kfree(buf);
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return ret;
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}
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static const struct file_operations mei_dbgfs_fops_active = {
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.open = simple_open,
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.read = mei_dbgfs_read_active,
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.llseek = generic_file_llseek,
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};
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static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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@ -128,6 +176,12 @@ int mei_dbgfs_register(struct mei_device *dev, const char *name)
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dev_err(&dev->pdev->dev, "meclients: registration failed\n");
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goto err;
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}
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f = debugfs_create_file("active", S_IRUSR, dir,
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dev, &mei_dbgfs_fops_active);
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if (!f) {
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dev_err(&dev->pdev->dev, "meclients: registration failed\n");
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goto err;
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}
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f = debugfs_create_file("devstate", S_IRUSR, dir,
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dev, &mei_dbgfs_fops_devstate);
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if (!f) {
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