diff options
Diffstat (limited to 'drivers/char/virtio_console.c')
| -rw-r--r-- | drivers/char/virtio_console.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 105181c1e6be..387fcdf019b7 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -152,6 +152,10 @@ struct ports_device { int chr_major; }; +struct port_stats { + unsigned long bytes_sent, bytes_received, bytes_discarded; +}; + /* This struct holds the per-port data */ struct port { /* Next port in the list, head is in the ports_device */ @@ -180,6 +184,13 @@ struct port { struct dentry *debugfs_file; /* + * Keep count of the bytes sent, received and discarded for + * this port for accounting and debugging purposes. These + * counts are not reset across port open / close events. + */ + struct port_stats stats; + + /* * The entries in this struct will be valid if this port is * hooked up to an hvc console */ @@ -360,6 +371,7 @@ static struct port_buffer *get_inbuf(struct port *port) if (buf) { buf->len = len; buf->offset = 0; + port->stats.bytes_received += len; } return buf; } @@ -396,6 +408,7 @@ static void discard_port_data(struct port *port) err = 0; while (buf) { + port->stats.bytes_discarded += buf->len - buf->offset; if (add_inbuf(port->in_vq, buf) < 0) { err++; free_buf(buf); @@ -519,6 +532,8 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, cpu_relax(); done: spin_unlock_irqrestore(&port->outvq_lock, flags); + + port->stats.bytes_sent += in_count; /* * We're expected to return the amount of data we wrote -- all * of it @@ -1049,6 +1064,14 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, out_offset += snprintf(buf + out_offset, out_count - out_offset, "outvq_full: %d\n", port->outvq_full); out_offset += snprintf(buf + out_offset, out_count - out_offset, + "bytes_sent: %lu\n", port->stats.bytes_sent); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "bytes_received: %lu\n", + port->stats.bytes_received); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "bytes_discarded: %lu\n", + port->stats.bytes_discarded); + out_offset += snprintf(buf + out_offset, out_count - out_offset, "is_console: %s\n", is_console_port(port) ? "yes" : "no"); out_offset += snprintf(buf + out_offset, out_count - out_offset, @@ -1133,6 +1156,7 @@ static int add_port(struct ports_device *portdev, u32 id) port->cons.ws.ws_row = port->cons.ws.ws_col = 0; port->host_connected = port->guest_connected = false; + port->stats = (struct port_stats) { 0 }; port->outvq_full = false; |