Re: [PATCH v2 3/6] common/board_f: Catch bloblist before starting resevations

[Simon Glass <sjg@chromium.org>]

On Fri, 10 Nov 2023 at 08:29, Devarsh Thakkar <devarsht@ti.com> wrote:
>
> Start reservations needed for init sequence only after catching
> bloblists from previous stage.
>
> This is to avoid catching bloblists in the middle causing
> gaps while u-boot is reserving.
>
> Adjust the relocaddr as per video hand-off information
> received from previous stage so that further reservations
> start only after regions reserved for previous stages
>
> Skip reservation for video memory if it was already
> filled by a bloblist.
>
> Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
> ---
> V2: Fix typo in commit title and checkpatch warnings/checks
> V3: No change
> ---
>  common/board_f.c | 33 ++++++++++++++++++++++++++++++---
>  1 file changed, 30 insertions(+), 3 deletions(-)

Reviewed-by: Simon Glass <sjg@chromium.org>


>
> diff --git a/common/board_f.c b/common/board_f.c
> index d4d7d01f8f..acf802c9cb 100644
> --- a/common/board_f.c
> +++ b/common/board_f.c
> @@ -403,7 +403,7 @@ __weak int arch_reserve_mmu(void)
>         return 0;
>  }
>
> -static int reserve_video(void)
> +static int reserve_video_from_videoblob(void)
>  {
>         if (IS_ENABLED(CONFIG_SPL_VIDEO_HANDOFF) && spl_phase() > PHASE_SPL) {
>                 struct video_handoff *ho;
> @@ -412,8 +412,34 @@ static int reserve_video(void)
>                 if (!ho)
>                         return log_msg_ret("blf", -ENOENT);
>                 video_reserve_from_bloblist(ho);
> -               gd->relocaddr = ho->fb;
> -       } else if (CONFIG_IS_ENABLED(VIDEO)) {
> +
> +               /* Sanity check fb from blob is before current relocaddr */
> +               if (likely(gd->relocaddr > (unsigned long)ho->fb))
> +                       gd->relocaddr = ho->fb;
> +       }
> +
> +       return 0;
> +}
> +
> +/*
> + * Check if any bloblist received specifying reserved areas from previous stage and adjust
> + * gd->relocaddr accordingly, so that we start reserving after pre-reserved areas
> + * from previous stage.
> + *
> + * NOTE:
> + * IT is recommended that all bloblists from previous stage are reserved from ram_top
> + * as next stage will simply start reserving further regions after them.
> + */
> +static int setup_relocaddr_from_bloblist(void)
> +{
> +       reserve_video_from_videoblob();
> +
> +       return 0;
> +}
> +
> +static int reserve_video(void)
> +{
> +       if (CONFIG_IS_ENABLED(VIDEO)) {
>                 ulong addr;
>                 int ret;
>
> @@ -923,6 +949,7 @@ static const init_fnc_t init_sequence_f[] = {
>         reserve_pram,
>  #endif
>         reserve_round_4k,
> +       setup_relocaddr_from_bloblist,
>         arch_reserve_mmu,
>         reserve_video,
>         reserve_trace,
> --
> 2.34.1
>