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arm64: handle 1GB block for VM_L3_4K

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With enough continuous physical memory we can have 1GB block.
This has been seen only in linear mapping region in kernel space.
Verified this for VM_L3_4K.

reference: alloc_init_pud(), use_1G_block() [arch/arm64/mm/mmu.c]

This problem can for instance be seen with vtop command, example:

  crash> vtop ffffffd988008000
  VIRTUAL           PHYSICAL
  ffffffd988008000  148008000

  PAGE DIRECTORY: ffffff9188c6c000
  PGD: ffffff9188c6cb30 => 68000140000711
  PMD: ffffffd980000200 => aa0003e2b9402fe1
  PAGE: 3e2b9400000  (2MB)

  PTE               PHYSICAL     FLAGS
  aa0003e2b9402fe1  3e2b9402000  (VALID|USER|RDONLY|SHARED|AF|NG)

Signed-off-by: Johan Erlandsson <johan.erlandsson@sony.com>
This commit is contained in:
Johan Erlandsson 2021-03-11 08:54:30 +00:00 committed by Kazuhito Hagio
parent c32abbf89d
commit dccdf95c25
1 changed files with 12 additions and 0 deletions
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12
arm64.c
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@ -1260,11 +1260,14 @@ arm64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbos
#define PTE_TO_PHYS(pteval) (machdep->max_physmem_bits == 52 ? \
(((pteval & PTE_ADDR_LOW) | ((pteval & PTE_ADDR_HIGH) << 36))) : (pteval & PTE_ADDR_LOW))
#define PUD_TYPE_MASK 3
#define PUD_TYPE_SECT 1
#define PMD_TYPE_MASK 3
#define PMD_TYPE_SECT 1
#define PMD_TYPE_TABLE 2
#define SECTION_PAGE_MASK_2MB ((long)(~((MEGABYTES(2))-1)))
#define SECTION_PAGE_MASK_512MB ((long)(~((MEGABYTES(512))-1)))
#define SECTION_PAGE_MASK_1GB ((long)(~((GIGABYTES(1))-1)))
static int
arm64_vtop_2level_64k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
@ -1420,6 +1423,15 @@ arm64_vtop_3level_4k(ulong pgd, ulong vaddr, physaddr_t *paddr, int verbose)
if (!pgd_val)
goto no_page;
if ((pgd_val & PUD_TYPE_MASK) == PUD_TYPE_SECT) {
ulong sectionbase = (pgd_val & SECTION_PAGE_MASK_1GB) & PHYS_MASK;
if (verbose) {
fprintf(fp, " PAGE: %lx (1GB)\n\n", sectionbase);
arm64_translate_pte(pgd_val, 0, 0);
}
*paddr = sectionbase + (vaddr & ~SECTION_PAGE_MASK_1GB);
return TRUE;
}
/*
* #define __PAGETABLE_PUD_FOLDED
*/