Re: [Xen-devel] [PATCH 16/25 v6] xen/arm: vpl011: Add a new handle_console_ring function in xenconsole

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 17, 2017 at 06:36:46PM +0530, Bhupinder Thakur wrote:
> This patch introduces a new handle_console_ring function. This function
> reads the data from the ring buffer on receiving an event.
> 
> Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
> ---
> CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
> 
> Changes since v5:
> - Split this change in a separate patch.
> 
>  tools/console/daemon/io.c | 41 ++++++++++++++++++++++++++++-------------
>  1 file changed, 28 insertions(+), 13 deletions(-)
> 
> diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
> index c272fe6..775fb04 100644
> --- a/tools/console/daemon/io.c
> +++ b/tools/console/daemon/io.c
> @@ -935,17 +935,24 @@ static void console_evtchn_unmask(struct console *con, 
> void *data)
>       }
>  }
>  
> -static void handle_ring_read(struct domain *dom)
> +static void handle_ring_read(struct console *con)
>  {
>       xenevtchn_port_or_error_t port;
> -     struct console *con = &dom->console;
>  
> -     if (dom->is_dead)
> +     if (con->d->is_dead)
>               return;
>  
>       if ((port = xenevtchn_pending(con->xce_handle)) == -1)
>               return;
>  
> +     if (port != con->local_port)
> +     {

Coding style.

> +             dolog(LOG_ERR, 

Trailing space.

> +                   "Event received for invalid port %d, Expected port is 
> %d\n",
> +                   port, con->local_port);
> +             return;
> +     }
> +
>       con->event_count++;
>  
>       buffer_append(con);
> @@ -954,6 +961,21 @@ static void handle_ring_read(struct domain *dom)
>               (void)xenevtchn_unmask(con->xce_handle, port);
>  }
>  
> +static void handle_console_ring(struct console *con)



> +{
> +     if (con->event_count < RATE_LIMIT_ALLOWANCE) {
> +             if (con->xce_handle != NULL &&
> +                 con->xce_pollfd_idx != -1 &&
> +                 !(fds[con->xce_pollfd_idx].revents &
> +                   ~(POLLIN|POLLOUT|POLLPRI)) &&
> +                 (fds[con->xce_pollfd_idx].revents &
> +                  POLLIN))
> +                     handle_ring_read(con);
> +     }
> +
> +     con->xce_pollfd_idx = -1;

It is worth noting in the commit message that you move the setting to -1
here but there shouldn't be any change in behaviour.

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