[PATCH 1/7] lib: sbi: Domains can be registered only before finalizing domains

[Xiang W <wxjstz@126.com>]

? 2021-04-10?? 12:48 +0530?Anup Patel???
> The domains are boot-time system-level partitions so we should
> allow platform support to register domains only before hart
> domain assignments are finalized.
> 
> Signed-off-by: Anup Patel <anup.patel@wdc.com>
looks good to me.

Reviewed-by: Xiang W <wxjstz@126.com>

Regards,
Xiang W
> ---
>  lib/sbi/sbi_domain.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/sbi/sbi_domain.c b/lib/sbi/sbi_domain.c
> index 195c941..2849241 100644
> --- a/lib/sbi/sbi_domain.c
> +++ b/lib/sbi/sbi_domain.c
> @@ -19,8 +19,8 @@
>  
>  struct sbi_domain *hartid_to_domain_table[SBI_HARTMASK_MAX_BITS] = {
> 0 };
>  struct sbi_domain *domidx_to_domain_table[SBI_DOMAIN_MAX_INDEX] = {
> 0 };
> -
>  static u32 domain_count = 0;
> +static bool domain_finalized = false;
>  
>  static struct sbi_hartmask root_hmask = { 0 };
>  
> @@ -376,7 +376,8 @@ int sbi_domain_register(struct sbi_domain *dom,
>  	u32 cold_hartid = current_hartid();
>  	const struct sbi_platform *plat = sbi_platform_thishart_ptr();
>  
> -	if (!dom || !assign_mask)
> +	/* Sanity checks */
> +	if (!dom || !assign_mask || domain_finalized)
>  		return SBI_EINVAL;
>  
>  	/* Check if domain already discovered */
> @@ -490,6 +491,12 @@ int sbi_domain_finalize(struct sbi_scratch
> *scratch, u32 cold_hartid)
>  		}
>  	}
>  
> +	/*
> +	 * Set the finalized flag so that the root domain
> +	 * regions can't be changed.
> +	 */
> +	domain_finalized = true;
> +
>  	return 0;
>  }
>  
> -- 
> 2.25.1
> 
>