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riscv: Implement missing huge_ptep_get

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huge_ptep_get must be reimplemented in order to go through all the PTEs
of a NAPOT region: this is needed because the HW can update the A/D bits
of any of the PTE that constitutes the NAPOT region.

Fixes: 82a1a1f3bf ("riscv: mm: support Svnapot in hugetlb page")
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230428120120.21620-2-alexghiti@rivosinc.com
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2023-04-28 14:01:20 +02:00 committed by Palmer Dabbelt
parent 835e5ac3f9
commit 6966d7988c
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2 changed files with 27 additions and 0 deletions
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3
arch/riscv/include/asm/hugetlb.h
View File

@ -36,6 +36,9 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty);
#define __HAVE_ARCH_HUGE_PTEP_GET
pte_t huge_ptep_get(pte_t *ptep);
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
#define arch_make_huge_pte arch_make_huge_pte

24
arch/riscv/mm/hugetlbpage.c
View File

@ -3,6 +3,30 @@
#include <linux/err.h>
#ifdef CONFIG_RISCV_ISA_SVNAPOT
pte_t huge_ptep_get(pte_t *ptep)
{
unsigned long pte_num;
int i;
pte_t orig_pte = ptep_get(ptep);
if (!pte_present(orig_pte) || !pte_napot(orig_pte))
return orig_pte;
pte_num = napot_pte_num(napot_cont_order(orig_pte));
for (i = 0; i < pte_num; i++, ptep++) {
pte_t pte = ptep_get(ptep);
if (pte_dirty(pte))
orig_pte = pte_mkdirty(orig_pte);
if (pte_young(pte))
orig_pte = pte_mkyoung(orig_pte);
}
return orig_pte;
}
pte_t *huge_pte_alloc(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long addr,