linux-kernel - Re: [PATCH v9 2/3] riscv: Move the linear mapping creation in its own function

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Date:   Mon, 27 Mar 2023 17:44:26 +0530
From:   Anup Patel <anup@...infault.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v9 2/3] riscv: Move the linear mapping creation in its own function

On Fri, Mar 24, 2023 at 9:26 PM Alexandre Ghiti <alexghiti@...osinc.com> wrote:
>
> No change intended, it just splits the linear mapping creation from
> setup_vm_final: this prepares for upcoming additions to the linear
> mapping creation.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

Reviewed-by: Anup Patel <anup@...infault.org>
Tested-by: Anup Patel <anup@...infault.org>

Regards,
Anup

> ---
>  arch/riscv/mm/init.c | 42 ++++++++++++++++++++++++++++--------------
>  1 file changed, 28 insertions(+), 14 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index cc558d94559a..3b37d8606920 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -1086,16 +1086,25 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>         pt_ops_set_fixmap();
>  }
>
> -static void __init setup_vm_final(void)
> +static void __init create_linear_mapping_range(phys_addr_t start,
> +                                              phys_addr_t end)
>  {
> +       phys_addr_t pa;
>         uintptr_t va, map_size;
> -       phys_addr_t pa, start, end;
> -       u64 i;
>
> -       /* Setup swapper PGD for fixmap */
> -       create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
> -                          __pa_symbol(fixmap_pgd_next),
> -                          PGDIR_SIZE, PAGE_TABLE);
> +       for (pa = start; pa < end; pa += map_size) {
> +               va = (uintptr_t)__va(pa);
> +               map_size = best_map_size(pa, end - pa);
> +
> +               create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
> +                                  pgprot_from_va(va));
> +       }
> +}
> +
> +static void __init create_linear_mapping_page_table(void)
> +{
> +       phys_addr_t start, end;
> +       u64 i;
>
>         /* Map all memory banks in the linear mapping */
>         for_each_mem_range(i, &start, &end) {
> @@ -1107,14 +1116,19 @@ static void __init setup_vm_final(void)
>                 if (end >= __pa(PAGE_OFFSET) + memory_limit)
>                         end = __pa(PAGE_OFFSET) + memory_limit;
>
> -               for (pa = start; pa < end; pa += map_size) {
> -                       va = (uintptr_t)__va(pa);
> -                       map_size = best_map_size(pa, end - pa);
> -
> -                       create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
> -                                          pgprot_from_va(va));
> -               }
> +               create_linear_mapping_range(start, end);
>         }
> +}
> +
> +static void __init setup_vm_final(void)
> +{
> +       /* Setup swapper PGD for fixmap */
> +       create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
> +                          __pa_symbol(fixmap_pgd_next),
> +                          PGDIR_SIZE, PAGE_TABLE);
> +
> +       /* Map the linear mapping */
> +       create_linear_mapping_page_table();
>
>         /* Map the kernel */
>         if (IS_ENABLED(CONFIG_64BIT))
> --
> 2.37.2
>