diff options
Diffstat (limited to 'arch/riscv/mm/init.c')
| -rw-r--r-- | arch/riscv/mm/init.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 15683ae13fa5..6091f3f06fa3 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -23,6 +23,7 @@ #include <linux/kfence.h> #include <linux/execmem.h> +#include <asm/alternative.h> #include <asm/fixmap.h> #include <asm/io.h> #include <asm/kasan.h> @@ -816,6 +817,7 @@ static __meminit pgprot_t pgprot_from_va(uintptr_t va) #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa); +u64 __pi_set_satp_mode_from_fdt(uintptr_t dtb_pa); static void __init disable_pgtable_l5(void) { @@ -855,18 +857,22 @@ static void __init set_mmap_rnd_bits_max(void) * underlying hardware: establish 1:1 mapping in 4-level page table mode * then read SATP to see if the configuration was taken into account * meaning sv48 is supported. + * The maximum SATP mode is limited by both the command line and the "mmu-type" + * property in the device tree, since some platforms may hang if an unsupported + * SATP mode is attempted. */ static __init void set_satp_mode(uintptr_t dtb_pa) { u64 identity_satp, hw_satp; uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; - u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa); + u64 satp_mode_limit = min_not_zero(__pi_set_satp_mode_from_cmdline(dtb_pa), + __pi_set_satp_mode_from_fdt(dtb_pa)); kernel_map.page_offset = PAGE_OFFSET_L5; - if (satp_mode_cmdline == SATP_MODE_57) { + if (satp_mode_limit == SATP_MODE_48) { disable_pgtable_l5(); - } else if (satp_mode_cmdline == SATP_MODE_48) { + } else if (satp_mode_limit == SATP_MODE_39) { disable_pgtable_l5(); disable_pgtable_l4(); return; |