Commit 4df5bb04 authored by Peter Hurley's avatar Peter Hurley Committed by Greg Kroah-Hartman

staging/fwserial: Factor unstable stats/debug/status info to debugfs

Add the following file hierarchy to debugfs:

  <debugfs>-+
            +- firewire_serial -+- <unit> -+- peers
                                |          +- stats
                                |
                                +- <unit> -+- peers
                                           +- stats

The 'peers' file (read-only) contains status and configuration
info for attached peers for the given fwserial unit.

The 'stats' file (read-only) contains statistics and data profiling
information for each tty port for the given fwserial unit.
Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e16d1ded
......@@ -84,6 +84,8 @@ static struct kmem_cache *fwtty_txn_cache;
struct tty_driver *fwtty_driver;
static struct tty_driver *fwloop_driver;
static struct dentry *fwserial_debugfs;
struct fwtty_transaction;
typedef void (*fwtty_transaction_cb)(struct fw_card *card, int rcode,
void *data, size_t length,
......@@ -1568,11 +1570,71 @@ static int fwtty_proc_show(struct seq_file *m, void *v)
return 0;
}
static int fwtty_debugfs_stats_show(struct seq_file *m, void *v)
{
struct fw_serial *serial = m->private;
struct fwtty_port *port;
int i;
for (i = 0; i < num_ports; ++i) {
port = fwtty_port_get(serial->ports[i]->index);
if (port) {
seq_printf(m, "%2d:", port->index);
fwtty_proc_show_port(m, port);
fwtty_debugfs_show_port(m, port);
fwtty_port_put(port);
seq_printf(m, "\n");
}
}
return 0;
}
static int fwtty_debugfs_peers_show(struct seq_file *m, void *v)
{
struct fw_serial *serial = m->private;
struct fwtty_peer *peer;
rcu_read_lock();
seq_printf(m, "card: %s guid: %016llx\n",
dev_name(serial->card->device),
(unsigned long long) serial->card->guid);
list_for_each_entry_rcu(peer, &serial->peer_list, list)
fwtty_debugfs_show_peer(m, peer);
rcu_read_unlock();
return 0;
}
static int fwtty_proc_open(struct inode *inode, struct file *fp)
{
return single_open(fp, fwtty_proc_show, NULL);
}
static int fwtty_stats_open(struct inode *inode, struct file *fp)
{
return single_open(fp, fwtty_debugfs_stats_show, inode->i_private);
}
static int fwtty_peers_open(struct inode *inode, struct file *fp)
{
return single_open(fp, fwtty_debugfs_peers_show, inode->i_private);
}
static const struct file_operations fwtty_stats_fops = {
.owner = THIS_MODULE,
.open = fwtty_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations fwtty_peers_fops = {
.owner = THIS_MODULE,
.open = fwtty_peers_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations fwtty_proc_fops = {
.owner = THIS_MODULE,
.open = fwtty_proc_open,
......@@ -2309,6 +2371,17 @@ static int fwserial_create(struct fw_unit *unit)
serial->ports[j]->loopback = true;
}
if (!IS_ERR_OR_NULL(fwserial_debugfs)) {
serial->debugfs = debugfs_create_dir(dev_name(&unit->device),
fwserial_debugfs);
if (!IS_ERR_OR_NULL(serial->debugfs)) {
debugfs_create_file("peers", 0444, serial->debugfs,
serial, &fwtty_peers_fops);
debugfs_create_file("stats", 0444, serial->debugfs,
serial, &fwtty_stats_fops);
}
}
list_add_rcu(&serial->list, &fwserial_list);
fwtty_notice(&unit, "TTY over FireWire on device %s (guid %016llx)",
......@@ -2321,6 +2394,8 @@ static int fwserial_create(struct fw_unit *unit)
fwtty_err(&unit, "unable to add peer unit device (%d)", err);
/* fall-through to error processing */
debugfs_remove_recursive(serial->debugfs);
list_del_rcu(&serial->list);
if (create_loop_dev)
tty_unregister_device(fwloop_driver, loop_idx(serial->ports[j]));
......@@ -2412,6 +2487,8 @@ static int fwserial_remove(struct device *dev)
/* unlink from the fwserial_list here */
list_del_rcu(&serial->list);
debugfs_remove_recursive(serial->debugfs);
for (i = 0; i < num_ttys; ++i)
fwserial_close_port(fwtty_driver, serial->ports[i]);
if (create_loop_dev)
......@@ -2806,6 +2883,9 @@ static int __init fwserial_init(void)
{
int err, num_loops = !!(create_loop_dev);
/* XXX: placeholder for a "firewire" debugfs node */
fwserial_debugfs = debugfs_create_dir(KBUILD_MODNAME, NULL);
/* num_ttys/num_ports must not be set above the static alloc avail */
if (num_ttys + num_loops > MAX_CARD_PORTS)
num_ttys = MAX_CARD_PORTS - num_loops;
......@@ -2920,6 +3000,7 @@ static int __init fwserial_init(void)
tty_unregister_driver(fwtty_driver);
put_tty:
put_tty_driver(fwtty_driver);
debugfs_remove_recursive(fwserial_debugfs);
return err;
}
......@@ -2935,6 +3016,7 @@ static void __exit fwserial_exit(void)
}
tty_unregister_driver(fwtty_driver);
put_tty_driver(fwtty_driver);
debugfs_remove_recursive(fwserial_debugfs);
}
module_init(fwserial_init);
......
......@@ -15,6 +15,7 @@
#include <linux/serial_reg.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include "dma_fifo.h"
......@@ -338,6 +339,7 @@ struct fw_serial {
struct fw_card *card;
struct kref kref;
struct dentry *debugfs;
struct fwtty_peer *self;
struct list_head list;
......
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