From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Now we can use an allocation function to remove our global console variable.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
---
drivers/char/virtio_console.c | 67 ++++++++++++++++++++++++++++-------------
1 files changed, 46 insertions(+), 21 deletions(-)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 6bbf707..82f5180 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -32,6 +32,18 @@
* across multiple devices and multiple ports per device.
*/
struct ports_driver_data {
+ /*
+ * This is used to keep track of the number of hvc consoles
+ * spawned by this driver. This number is given as the first
+ * argument to hvc_alloc(). To correctly map an initial
+ * console spawned via hvc_instantiate to the console being
+ * hooked up via hvc_alloc, we need to pass the same vtermno.
+ *
+ * We also just assume the first console being initialised was
+ * the first one that got used as the initial console.
+ */
+ unsigned int next_vtermno;
+
/* All the console devices handled by this driver */
struct list_head consoles;
};
@@ -69,9 +81,6 @@ struct port {
u32 vtermno;
};
-/* We have one port ready to go immediately, for a console. */
-static struct port console;
-
/* This is the very early arch-specified put chars function. */
static int (*early_put_chars)(u32, const char *, int);
@@ -299,6 +308,30 @@ int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
return hvc_instantiate(0, 0, &hv_ops);
}
+static struct port *__devinit add_port(u32 vtermno)
+{
+ struct port *port;
+
+ port = kmalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return NULL;
+
+ port->inbuf = alloc_buf(PAGE_SIZE);
+ if (!port->inbuf) {
+ kfree(port);
+ return NULL;
+ }
+ port->hvc = NULL;
+ port->vtermno = vtermno;
+ return port;
+}
+
+static void free_port(struct port *port)
+{
+ free_buf(port->inbuf);
+ kfree(port);
+}
+
/*
* Once we're further in boot, we get probed like any other virtio
* device. At this stage we set up the output virtqueue.
@@ -318,24 +351,16 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
struct port *port;
int err;
- port = &console;
- if (port->vdev) {
- dev_warn(&port->vdev->dev,
- "Multiple virtio-console devices not supported yet\n");
- return -EEXIST;
+ port = add_port(pdrvdata.next_vtermno);
+ if (!port) {
+ err = -ENOMEM;
+ goto fail;
}
/* Attach this port to this virtio_device, and vice-versa. */
port->vdev = vdev;
vdev->priv = port;
- /* This is the scratch page we use to receive console input */
- port->inbuf = alloc_buf(PAGE_SIZE);
- if (!port->inbuf) {
- err = -ENOMEM;
- goto fail;
- }
-
/* Find the queues. */
err = vdev->config->find_vqs(vdev, 2, vqs, callbacks, names);
if (err)
@@ -346,17 +371,16 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
/*
* The first argument of hvc_alloc() is the virtual console
- * number, so we use zero. The second argument is the
- * parameter for the notification mechanism (like irq
- * number). We currently leave this as zero, virtqueues have
- * implicit notifications.
+ * 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->hvc = hvc_alloc(0, 0, &hv_ops, PAGE_SIZE);
+ port->hvc = hvc_alloc(port->vtermno, 0, &hv_ops, PAGE_SIZE);
if (IS_ERR(port->hvc)) {
err = PTR_ERR(port->hvc);
goto free_vqs;
@@ -364,6 +388,7 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
/* Add to vtermno list. */
spin_lock_irq(&pdrvdata_lock);
+ pdrvdata.next_vtermno++;
list_add(&port->list, &pdrvdata.consoles);
spin_unlock_irq(&pdrvdata_lock);
@@ -377,7 +402,7 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
free_vqs:
vdev->config->del_vqs(vdev);
free:
- free_buf(port->inbuf);
+ free_port(port);
fail:
return err;
}
--
1.6.2.5
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