| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAM4kBBLhKsysQCf1GgpSvnGKVV2HsOoVP+4VvYmQaqfpKJ45+A@mail.gmail.com>
Date: Thu, 21 Jan 2021 10:21:48 +0100
From: Vitaly Wool <vitaly.wool@...sulko.com>
To: linux-riscv <linux-riscv@...ts.infradead.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Anup Patel <anup@...infault.org>,
Palmer Dabbelt <palmerdabbelt@...gle.com>,
Damien Le Moal <damien.lemoal@....com>,
devicetree@...r.kernel.org
Subject: Re: [PATCH v3] riscv: add BUILTIN_DTB support for MMU-enabled targets
On Sat, Jan 16, 2021 at 12:57 AM Vitaly Wool <vitaly.wool@...sulko.com> wrote:
>
> Sometimes, especially in a production system we may not want to
> use a "smart bootloader" like u-boot to load kernel, ramdisk and
> device tree from a filesystem on eMMC, but rather load the kernel
> from a NAND partition and just run it as soon as we can, and in
> this case it is convenient to have device tree compiled into the
> kernel binary. Since this case is not limited to MMU-less systems,
> let's support it for these which have MMU enabled too.
>
> While at it, provide __dtb_start as a parameter to setup_vm() in
> BUILTIN_DTB case, so we don't have to duplicate BUILTIN_DTB specific
> processing in MMU-enabled and MMU-disabled versions of setup_vm().
@Palmer: ping :)
> Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.com>
While at it, since this is just a respin/concatenation:
@Damien: are you okay with re-adding 'Tested-By:' ?
@Anup: are you okay with adding 'Reviewed-by:' since you have reviewed
both v1 patches that were concatenated?
Best regards,
Vitaly
> ---
> Changes from v2:
> * folded "RISC-V: simplify BUILTIN_DTB processing" patch
> [http://lists.infradead.org/pipermail/linux-riscv/2021-January/004153.html]
> Changes from v1:
> * no direct initial_boot_params assignment
> * skips the temporary mapping for DT if BUILTIN_DTB=y
>
> arch/riscv/Kconfig | 1 -
> arch/riscv/kernel/head.S | 4 ++++
> arch/riscv/mm/init.c | 19 +++++++++++++------
> 3 files changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 2ef05ef921b5..444a1ed1e847 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -445,7 +445,6 @@ endmenu
>
> config BUILTIN_DTB
> def_bool n
> - depends on RISCV_M_MODE
> depends on OF
>
> menu "Power management options"
> diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
> index 16e9941900c4..f5a9bad86e58 100644
> --- a/arch/riscv/kernel/head.S
> +++ b/arch/riscv/kernel/head.S
> @@ -260,7 +260,11 @@ clear_bss_done:
>
> /* Initialize page tables and relocate to virtual addresses */
> la sp, init_thread_union + THREAD_SIZE
> +#ifdef CONFIG_BUILTIN_DTB
> + la a0, __dtb_start
> +#else
> mv a0, s1
> +#endif /* CONFIG_BUILTIN_DTB */
> call setup_vm
> #ifdef CONFIG_MMU
> la a0, early_pg_dir
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 30b61f2c6b87..45faad7c4291 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -192,10 +192,13 @@ void __init setup_bootmem(void)
> #endif /* CONFIG_BLK_DEV_INITRD */
>
> /*
> - * Avoid using early_init_fdt_reserve_self() since __pa() does
> + * If DTB is built in, no need to reserve its memblock.
> + * Otherwise, do reserve it but avoid using
> + * early_init_fdt_reserve_self() since __pa() does
> * not work for DTB pointers that are fixmap addresses
> */
> - memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
> + if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
> + memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
>
> early_init_fdt_scan_reserved_mem();
> dma_contiguous_reserve(dma32_phys_limit);
> @@ -499,6 +502,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> /* Setup early PMD for DTB */
> create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
> (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
> +#ifndef CONFIG_BUILTIN_DTB
> /* Create two consecutive PMD mappings for FDT early scan */
> pa = dtb_pa & ~(PMD_SIZE - 1);
> create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
> @@ -506,7 +510,11 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
> pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
> dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
> +#else /* CONFIG_BUILTIN_DTB */
> + dtb_early_va = __va(dtb_pa);
> +#endif /* CONFIG_BUILTIN_DTB */
> #else
> +#ifndef CONFIG_BUILTIN_DTB
> /* Create two consecutive PGD mappings for FDT early scan */
> pa = dtb_pa & ~(PGDIR_SIZE - 1);
> create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
> @@ -514,6 +522,9 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
> pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
> dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
> +#else /* CONFIG_BUILTIN_DTB */
> + dtb_early_va = __va(dtb_pa);
> +#endif /* CONFIG_BUILTIN_DTB */
> #endif
> dtb_early_pa = dtb_pa;
>
> @@ -604,11 +615,7 @@ static void __init setup_vm_final(void)
> #else
> asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> {
> -#ifdef CONFIG_BUILTIN_DTB
> - dtb_early_va = (void *) __dtb_start;
> -#else
> dtb_early_va = (void *)dtb_pa;
> -#endif
> dtb_early_pa = dtb_pa;
> }
>
> --
> 2.20.1
>
Powered by blists - more mailing lists