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Message-ID: <CAAhSdy0DJZKhtSwiVvFMTqka6Piym2DTiqTYJq16CJrOPO4ktQ@mail.gmail.com>
Date: Thu, 21 Jan 2021 17:32:52 +0530
From: Anup Patel <anup@...infault.org>
To: Vitaly Wool <vitaly.wool@...sulko.com>
Cc: linux-riscv <linux-riscv@...ts.infradead.org>,
LKML <linux-kernel@...r.kernel.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 Thu, Jan 21, 2021 at 2:51 PM Vitaly Wool <vitaly.wool@...sulko.com> wrote:
>
> 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?
Yes, my Reviewed-by holds on this patch as well.
Reviewed-by: Anup Patel <anup@...infault.org>
Best Regards,
Anup
>
> 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
> >
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