[PATCH 05/16] lib: Kconfig: add a config symbol for getting lmb memory map updates

[Heinrich Schuchardt]

On 9/5/24 10:28, Sughosh Ganu wrote:
> Add a Kconfig symbol to enable getting updates on any memory map
> changes that might be done by the LMB module. This notification
> mechanism can then be used to have a synchronous view of allocated and
> free memory.
>
> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> ---
>   lib/Kconfig | 11 +++++++++++
>   1 file changed, 11 insertions(+)
>
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 5f282ecb54..2e73cda580 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -74,6 +74,17 @@ config HAVE_PRIVATE_LIBGCC
>   config LIB_UUID
>   	bool
>
> +config MEM_MAP_UPDATE_NOTIFY
> +	bool "Get notified of any changes to the LMB memory map"
> +	depends on LMB && EFI_LOADER
> +	select EVENT
> +	default y
> +	help
> +	  Enable this option to get notification on any changes to the
> +	  memory that is allocated or freed by the LMB module. This will
> +	  allow different modules that allocate memory or maintain a memory
> +	  map to have a synchronous view of available and allocated memory.

We should have only one store for all LMB allocations. They should not
be duplicated in the EFI sub-system.

The event is only needed to notify EFI_EVENT_GROUP_MEMORY_MAP_CHANGE.

Best regards

Heinrich


> +
>   config RANDOM_UUID
>   	bool "GPT Random UUID generation"
>   	select LIB_UUID