Re: [PATCH 11/11] xen/arm: vpl011: Modify handle_tty_read in xenconsole to redirect user data to vpl011 IN ring buffer

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Feb 21, 2017 at 04:56:08PM +0530, Bhupinder Thakur wrote:
> Modification in handle_tty_read to write the user data to the vpl011 IN ring buffer.
> 
> Finally this needs to be modified to allow user input for both PV and vpl011 consoles.
> 
> Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
> ---
>  tools/console/daemon/io.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
> index 4e531e7..a59b4c0 100644
> --- a/tools/console/daemon/io.c
> +++ b/tools/console/daemon/io.c
> @@ -877,6 +877,9 @@ static int ring_free_bytes(struct domain *dom)
>  	struct xencons_interface *intf = dom->interface;
>  	XENCONS_RING_IDX cons, prod, space;
>  
> +	if ( dom->vpl011_initialized )
> +		intf = dom->vpl011_interface;
> +
>  	cons = intf->in_cons;
>  	prod = intf->in_prod;
>  	xen_mb();
> @@ -904,8 +907,9 @@ static void handle_tty_read(struct domain *dom)
>  	ssize_t len = 0;
>  	char msg[80];
>  	int i;
> -	struct xencons_interface *intf = dom->interface;
> +	struct xencons_interface *intf=dom->interface;

Please don't.

>  	XENCONS_RING_IDX prod;
> +	xenevtchn_port_or_error_t port=dom->local_port;

Please add spaces.

>  
>  	if (dom->is_dead)
>  		return;
> @@ -918,6 +922,16 @@ static void handle_tty_read(struct domain *dom)
>  		len = sizeof(msg);
>  
>  	len = read(dom->master_fd, msg, len);
> +
> +	/* select the interface based on whether vpl011 console is 
> +	* enabled or not

Please remove this comment. It is quite obvious from the code what
it does.

> +	*/
> +	if ( dom->vpl011_initialized )
> +	{
> +		intf = dom->vpl011_interface;
> +		port = dom->vpl011_local_port;
> +	}
> +
>  	/*
>  	 * Note: on Solaris, len == 0 means the slave closed, and this
>  	 * is no problem, but Linux can't handle this usefully, so we
> @@ -927,13 +941,14 @@ static void handle_tty_read(struct domain *dom)
>  		domain_handle_broken_tty(dom, domain_is_valid(dom->domid));
>  	} else if (domain_is_valid(dom->domid)) {
>  		prod = intf->in_prod;
> +

<cough> Please remove this.


>  		for (i = 0; i < len; i++) {
>  			intf->in[MASK_XENCONS_IDX(prod++, intf->in)] =
>  				msg[i];
>  		}
>  		xen_wmb();
>  		intf->in_prod = prod;
> -		xenevtchn_notify(dom->xce_handle, dom->local_port);
> +		xenevtchn_notify(dom->xce_handle, port);
>  	} else {
>  		domain_close_tty(dom);
>  		shutdown_domain(dom);
> -- 
> 2.7.4
> 
> 
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