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virtio: console: add flow control 

The virtio-serial-bus already has the logic to make flow control work
properly.  Hook into the char layer's new ability to signal a backend is
writable again.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Message-id: abffa02235d55ca6e2489068c58971c8897e976c.1362505276.git.amit.shah@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Amit Shah 2013-03-05 23:21:34 +05:30 committed by Anthony Liguori
parent fcfb4d6aae
commit 7df4d4578f
1 changed files with 13 additions and 0 deletions
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13
hw/virtio-console.c
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@ -20,6 +20,18 @@ typedef struct VirtConsole {
CharDriverState *chr;
} VirtConsole;
/*
* Callback function that's called from chardevs when backend becomes
* writable.
*/
static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
void *opaque)
{
VirtConsole *vcon = opaque;
virtio_serial_throttle_port(&vcon->port, false);
return FALSE;
}
/* Callback function that's called when the guest sends us data */
static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
@ -48,6 +60,7 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
* do_flush_queued_data().
*/
ret = 0;
qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked, vcon);
}
return ret;
}