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virtio: console: Separate out console init into a new function 

Console ports could be hot-added. Also, with the new multiport support,
a port is identified as a console port only if the host sends a control
message.

Move the console port init into a separate function so it can be invoked
from other places.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2010-01-18 19:15:10 +05:30 committed by Rusty Russell
parent 4f23c573c0
commit cfa6d37925
1 changed files with 39 additions and 22 deletions
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61
drivers/char/virtio_console.c
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@ -346,6 +346,43 @@ int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
return hvc_instantiate(0, 0, &hv_ops);
}
int __devinit init_port_console(struct port *port)
{
int ret;
/*
* The Host's telling us this port is a console port. Hook it
* up with an hvc console.
*
* To set up and manage our virtual console, we call
* hvc_alloc().
*
* The first argument of hvc_alloc() is the virtual console
* number. The second argument is the parameter for the
* notification mechanism (like irq number). We currently
* leave this as zero, virtqueues have implicit notifications.
*
* The third argument is a "struct hv_ops" containing the
* put_chars() get_chars(), notifier_add() and notifier_del()
* pointers. The final argument is the output buffer size: we
* can do any size, so we put PAGE_SIZE here.
*/
port->cons.vtermno = pdrvdata.next_vtermno;
port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE);
if (IS_ERR(port->cons.hvc)) {
ret = PTR_ERR(port->cons.hvc);
port->cons.hvc = NULL;
return ret;
}
spin_lock_irq(&pdrvdata_lock);
pdrvdata.next_vtermno++;
list_add_tail(&port->cons.list, &pdrvdata.consoles);
spin_unlock_irq(&pdrvdata_lock);
return 0;
}
static int __devinit add_port(struct ports_device *portdev)
{
struct port *port;
@ -367,29 +404,9 @@ static int __devinit add_port(struct ports_device *portdev)
goto free_port;
}
/*
* The first argument of hvc_alloc() is the virtual console
* number. The second argument is the parameter for the
* notification mechanism (like irq number). We currently
* leave this as zero, virtqueues have implicit notifications.
*
* The third argument is a "struct hv_ops" containing the
* put_chars(), get_chars(), notifier_add() and notifier_del()
* pointers. The final argument is the output buffer size: we
* can do any size, so we put PAGE_SIZE here.
*/
port->cons.vtermno = pdrvdata.next_vtermno;
port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE);
if (IS_ERR(port->cons.hvc)) {
err = PTR_ERR(port->cons.hvc);
err = init_port_console(port);
if (err)
goto free_inbuf;
}
/* Add to vtermno list. */
spin_lock_irq(&pdrvdata_lock);
pdrvdata.next_vtermno++;
list_add(&port->cons.list, &pdrvdata.consoles);
spin_unlock_irq(&pdrvdata_lock);
/* Register the input buffer the first time. */
add_inbuf(port->in_vq, port->inbuf);