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arm64: map FDT as RW for early_init_dt_scan()

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commit e112b032a72c78f15d0c803c5dc6be444c2e6c66 upstream.

Currently in arm64, FDT is mapped to RO before it's passed to
early_init_dt_scan(). However, there might be some codes
(eg. commit "fdt: add support for rng-seed") that need to modify FDT
during init. Map FDT to RO after early fixups are done.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Will Deacon <will@kernel.org>
[mkbestas: fixed trivial conflicts for 4.9 backport]
Signed-off-by: Michael Bestas <mkbestas@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hsin-Yi Wang 2019-08-23 14:24:50 +08:00 committed by Greg Kroah-Hartman
parent 8569b4ada1
commit 3e930a2dea
4 changed files with 11 additions and 20 deletions
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2
arch/arm64/include/asm/mmu.h
View File

@ -90,7 +90,7 @@ extern void init_mem_pgprot(void);
extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot, bool allow_block_mappings);
extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
#endif /* !__ASSEMBLY__ */
#endif

5
arch/arm64/kernel/kaslr.c
View File

@ -65,9 +65,6 @@ out:
return default_cmdline;
}
extern void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size,
pgprot_t prot);
/*
* This routine will be executed with the kernel mapped at its default virtual
* address, and if it returns successfully, the kernel will be remapped, and
@ -96,7 +93,7 @@ u64 __init kaslr_early_init(u64 dt_phys, u64 modulo_offset)
* attempt at mapping the FDT in setup_machine()
*/
early_fixmap_init();
fdt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
fdt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
if (!fdt)
return 0;

9
arch/arm64/kernel/setup.c
View File

@ -178,7 +178,11 @@ static void __init smp_build_mpidr_hash(void)
static void __init setup_machine_fdt(phys_addr_t dt_phys)
{
void *dt_virt = fixmap_remap_fdt(dt_phys);
int size;
void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
if (dt_virt)
memblock_reserve(dt_phys, size);
if (!dt_virt || !early_init_dt_scan(dt_virt)) {
pr_crit("\n"
@ -191,6 +195,9 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
cpu_relax();
}
/* Early fixups are done, map the FDT as read-only now */
fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name());
}

15
arch/arm64/mm/mmu.c
View File

@ -718,7 +718,7 @@ void __set_fixmap(enum fixed_addresses idx,
}
}
void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
void *__init fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
{
const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
int offset;
@ -771,19 +771,6 @@ void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
return dt_virt;
}
void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
{
void *dt_virt;
int size;
dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
if (!dt_virt)
return NULL;
memblock_reserve(dt_phys, size);
return dt_virt;
}
int __init arch_ioremap_pud_supported(void)
{
/*