linux-kernel - Re: [PATCH] serial: core: Add support for dev

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Date:   Wed, 19 Jul 2023 07:25:35 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: core: Add support for dev_name:0.0 naming for
 kernel console

On 19. 07. 23, 7:15, Tony Lindgren wrote:
> With the serial core controller related changes we can now start
> addressing serial ports with dev_name:0.0 naming. The names are something
> like 00:04.0:0.0 on qemu, and 2800000.serial.0:0.0 on ARM for example.
> 
> The dev_name is unique serial port hardware controller device name, also
> known as port->dev, and 0.0 are the serial core controller id and port id.
> 
> Typically 0.0 are used for each controller and port instance unless the
> serial port hardware controller has multiple controllers or ports.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
> 
> Note that this depends on fix for serial core port ids patch
> "[PATCH] serial: core: Fix serial core port id to not use port->line"
> 
> ---
>   drivers/tty/serial/serial_core.c | 47 ++++++++++++++++++++++++++++++++
>   1 file changed, 47 insertions(+)
> 
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3322,6 +3322,49 @@ static int serial_core_port_device_add(struct serial_ctrl_device *ctrl_dev,
>   	return 0;
>   }
>   
> +/*
> + * Add preferred console if configured on kernel command line with naming
> + * "console=dev_name:0.0".
> + */
> +static int serial_core_add_preferred_console(struct uart_driver *drv,
> +					     struct uart_port *port)
> +{
> +	char *port_match, *opt, *name;
> +	int len, ret = 0;
> +
> +	port_match = kasprintf(GFP_KERNEL, "console=%s:%i.%i",
> +			       dev_name(port->dev), port->ctrl_id,
> +			       port->port_id);
> +	if (!port_match)
> +		return -ENOMEM;
> +
> +	opt = strstr(saved_command_line, port_match);
> +	if (!opt)
> +		goto free_port_match;
> +
> +	len = strlen(port_match);
> +
> +	if (strlen(opt) > len + 1 && opt[len] == ',')
> +		opt += len + 1;
> +	else
> +		opt = NULL;
> +
> +	name = kstrdup(drv->dev_name, GFP_KERNEL);

Why do you dup the name here?

> +	if (!name) {
> +		ret = -ENOMEM;
> +		goto free_port_match;
> +	}
> +
> +	add_preferred_console(name, port->line, opt);
> +
> +	kfree(name);

thanks,
-- 
js
suse labs