linux-kernel - Re: [External] Re: [PATCH] RISC-V: ACPI: fix early_ioremap to early

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Message-ID: <CAEEQ3wmw8B_cOs54H4Z8e2QTGyeE2cAYQwDRyk7KgUUKTFhZ-g@mail.gmail.com>
Date: Mon, 21 Oct 2024 14:45:20 +0800
From: yunhui cui <cuiyunhui@...edance.com>
To: Alexandre Ghiti <alex@...ti.fr>
Cc: punit.agrawal@...edance.com, paul.walmsley@...ive.com, palmer@...belt.com, 
	aou@...s.berkeley.edu, sunilvl@...tanamicro.com, ajones@...tanamicro.com, 
	alexghiti@...osinc.com, jeeheng.sia@...rfivetech.com, haibo1.xu@...el.com, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [PATCH] RISC-V: ACPI: fix early_ioremap to early_memremap

Hi Alex,

On Mon, Oct 14, 2024 at 9:01 PM Alexandre Ghiti <alex@...ti.fr> wrote:
>
> On 14/10/2024 14:30, yunhui cui wrote:
> > Hi Alex,
> >
> > On Mon, Oct 14, 2024 at 8:12 PM Alexandre Ghiti <alex@...ti.fr> wrote:
> >> Hi Yunhui,
> >>
> >> On 14/10/2024 11:47, Yunhui Cui wrote:
> >>> When SVPBMT is enabled, __acpi_map_table() will directly access the
> >>> data in DDR through the IO attribute, rather than through hardware
> >>> cache consistency, resulting in incorrect data in the obtained ACPI
> >>> table.
> >>>
> >>> The log: ACPI: [ACPI:0x18] Invalid zero length.
> >>>
> >>> We do not assume whether the bootloader flushes or not. We should
> >>> access in a cacheable way instead of maintaining cache consistency
> >>> by software.
> >>>
> >>> Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> >>> ---
> >>>    arch/riscv/kernel/acpi.c | 2 +-
> >>>    1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c
> >>> index 6e0d333f57e5..3177c9af8764 100644
> >>> --- a/arch/riscv/kernel/acpi.c
> >>> +++ b/arch/riscv/kernel/acpi.c
> >>> @@ -210,7 +210,7 @@ void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
> >>>        if (!size)
> >>>                return NULL;
> >>>
> >>> -     return early_ioremap(phys, size);
> >>> +     return early_memremap(phys, size);
> >>>    }
> >>>
> >>>    void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
> >>
> >> It makes sense to me since with this, we don't have to care about how
> >> the firmware mapped the table. And it mimics all other architectures
> >> (arm64, loongarch and x86).
> >>
> >> Here is the corresponding fixes tag:
> >>
> >> Fixes: 3b426d4b5b14 ("RISC-V: ACPI : Fix for usage of pointers in
> >> different address space")
> >>
> >> With the corresponding fix in __acpi_unmap_table() as pointed by Sunil,
> >> you can add:
> >>
> >> Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
> >>
> >> And regarding the sparse error, I don't see any other architecture
> >> casting to __iomem, so maybe that's not necessary anymore?
> > OK. I will make the changes in v2. Regarding the sparse error, I will
> > use another patch specifically to solve it. Is that okay?
>
>
> If the second patch only consists in casting, I would not use another
> patch since the patch 2 would fix something introduced in patch 1.
>
> But if patch 2 is more complicated,  it may make sense to do as you
> suggest, the goal is to merge patch 1 asap.

Regarding patch 2, I executed "make & make install" for sparse of the
riscv arch. I "git cloned" from
https://github.com/ConchuOD/sparse.git.
Then when compiling the kernel, the following error was reported:

cd /data00/cyh/linux-next/
make defconfig
cp .config build-riscv64/

make O=build-riscv64/ C=1 W=1 arch/riscv/kernel/ drivers/acpi/
drivers/mailbox/ -j
make[1]: Entering directory '/data00/cyh/linux-next/build-riscv64'
  GEN     Makefile
  CC      scripts/mod/empty.o
  CC      scripts/mod/devicetable-offsets.s
  CHECK   ../scripts/mod/empty.c
invalid argument to '-march': '_zicsr_zifencei'

make[3]: *** [../scripts/Makefile.build:229: scripts/mod/empty.o] Error 1
make[3]: *** Deleting file 'scripts/mod/empty.o'
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [/data00/cyh/linux-next/Makefile:1215: prepare0] Error 2
make[1]: *** [/data00/cyh/linux-next/Makefile:224: __sub-make] Error 2

Do you know the solution?

>
> Thanks!
>
> Alex
>
>
> >
> >> Thanks,
> >>
> >> Alex
> >>
> >>
> > Thanks,
> > Yunhui

Thanks,
Yunhui