[PATCH] bootchooser: add new value "reset" to reset boot attempts counter

[Sascha Hauer]

On Thu, Dec 14, 2023 at 08:01:25PM +0100, Holger Assmann wrote:
> bootchooser provides a mechanism that allows for resetting the
> "remaining_attempts" counters of all enabled boot slots to their
> defaults.
> 
> The current possible trigger values to be stored in the defining
> variable $bootchooser.reset_attempts are "all-zero" (i.e. no attempts
> left at any boot slot) and "power-on" (i.e. $global.system.reset="POR").
> 
> We now want to add the option "reset" (i.e. $global.system.reset="RST")
> to that list, so that we do not have to perform an entire power cycle
> every time we need a counter reset.
> 
> By introducing the "reset" value as an option, we can deliberately cause
> the bootchooser to set the "remaining_attempts" values to their defaults
> when performing a generic restart. The restart handler of the main OS
> is hence responsible that the subsequent barebox run sees "RESET_RST" as
> reset reason instead of e.g. "RESET_WDG".
> 
> Signed-off-by: Holger Assmann <h.assmann at pengutronix.de>
> ---
>  Documentation/user/bootchooser.rst |  6 ++++++
>  common/bootchooser.c               | 11 +++++++++++
>  2 files changed, 17 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/Documentation/user/bootchooser.rst b/Documentation/user/bootchooser.rst
> index db0a4f8898..1a2ce70bb2 100644
> --- a/Documentation/user/bootchooser.rst
> +++ b/Documentation/user/bootchooser.rst
> @@ -92,6 +92,12 @@ list of space-separated flags. Possible values are:
>    (``$global.system.reset="POR"``) is detected, the ``remaining_attempts``
>    counters of all enabled targets are reset to their defaults.
>    This means after a power cycle all boot targets will be tried again for the configured number of retries.
> +- ``reset``: When the bootchooser starts and a generic reset
> +  (``$global.system.reset="RST"``) is detected, the ``remaining_attempts``
> +  counters of all enabled targets are reset to their defaults.
> +  This means that, if the systems reports a generic restart, the
> +  ``remaining_attempts`` counters of all enabled targets are reset to
> +  their defaults.
>  - ``all-zero``: When the bootchooser starts and the ``remaining_attempts``
>    counters of all enabled targets are zero, the ``remaining_attempts``
>    counters of all enabled targets are reset to their defaults.
> diff --git a/common/bootchooser.c b/common/bootchooser.c
> index eb3dda52ab..022e225165 100644
> --- a/common/bootchooser.c
> +++ b/common/bootchooser.c
> @@ -77,6 +77,7 @@ struct bootchooser_target {
>  enum reset_attempts {
>  	RESET_ATTEMPTS_POWER_ON,
>  	RESET_ATTEMPTS_ALL_ZERO,
> +	RESET_ATTEMPTS_SRC_RST,
>  };
>  
>  static unsigned long reset_attempts;
> @@ -439,6 +440,13 @@ struct bootchooser *bootchooser_get(void)
>  		attempts_resetted = 1;
>  	}
>  
> +	if (test_bit(RESET_ATTEMPTS_SRC_RST, &reset_attempts) &&
> +	    reset_source_get() == RESET_RST && !attempts_resetted) {
> +		pr_info("RST Reset, resetting remaining attempts\n");
> +		bootchooser_reset_attempts(bc);
> +		attempts_resetted = 1;
> +	}
> +
>  	if (test_bit(RESET_ATTEMPTS_ALL_ZERO, &reset_attempts)) {
>  		int attempts = 0;
>  
> @@ -915,6 +923,7 @@ static int bootchooser_add_entry(struct bootentries *entries, const char *name)
>  static const char * const reset_attempts_names[] = {
>  	[RESET_ATTEMPTS_POWER_ON] = "power-on",
>  	[RESET_ATTEMPTS_ALL_ZERO] = "all-zero",
> +	[RESET_ATTEMPTS_SRC_RST] = "reset",
>  };
>  
>  static const char * const reset_priorities_names[] = {
> @@ -951,6 +960,8 @@ BAREBOX_MAGICVAR(global.bootchooser.targets,
>  		 "bootchooser: Space separated list of target names");
>  BAREBOX_MAGICVAR(global.bootchooser.default_attempts,
>  		 "bootchooser: Default number of attempts for a target");
> +BAREBOX_MAGICVAR(global.bootchooser.reset_attempts,
> +		"bootchooser: Choose condition to reset number of attempts for all enabled targets ('power-on', 'all-zero', 'reset')");
>  BAREBOX_MAGICVAR(global.bootchooser.default_priority,
>  		 "bootchooser: Default priority for a target");
>  BAREBOX_MAGICVAR(global.bootchooser.state_prefix,
> -- 
> 2.39.2
> 
> 
> 

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