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RISC-V: ACPI: fix early_ioremap to early_memremap

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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.

Fixes: 3b426d4b5b ("RISC-V: ACPI : Fix for usage of pointers in different address space")
Cc: stable@vger.kernel.org
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Link: https://lore.kernel.org/r/20241014130141.86426-1-cuiyunhui@bytedance.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Yunhui Cui 2024-10-14 21:01:41 +08:00 committed by Palmer Dabbelt
parent cfb10de185
commit 1966db682f
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 2 additions and 2 deletions
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4
arch/riscv/kernel/acpi.c
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@ -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)
@ -218,7 +218,7 @@ void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
if (!map || !size)
return;
early_iounmap(map, size);
early_memunmap(map, size);
}
void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)