1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5
6 #include <linux/fs.h>
7 #include <linux/mm.h>
8 #include <linux/hugetlb.h>
9 #include <linux/pagemap.h>
10 #include <linux/err.h>
11 #include <linux/sysctl.h>
12 #include <asm/mman.h>
13 #include <asm/tlb.h>
14 #include <asm/tlbflush.h>
15
huge_pte_alloc(struct mm_struct * mm,struct vm_area_struct * vma,unsigned long addr,unsigned long sz)16 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
17 unsigned long addr, unsigned long sz)
18 {
19 pgd_t *pgd;
20 p4d_t *p4d;
21 pud_t *pud;
22 pte_t *pte = NULL;
23
24 pgd = pgd_offset(mm, addr);
25 p4d = p4d_alloc(mm, pgd, addr);
26 pud = pud_alloc(mm, p4d, addr);
27 if (pud)
28 pte = (pte_t *)pmd_alloc(mm, pud, addr);
29
30 return pte;
31 }
32
huge_pte_offset(struct mm_struct * mm,unsigned long addr,unsigned long sz)33 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
34 unsigned long sz)
35 {
36 pgd_t *pgd;
37 p4d_t *p4d;
38 pud_t *pud;
39 pmd_t *pmd = NULL;
40
41 pgd = pgd_offset(mm, addr);
42 if (pgd_present(*pgd)) {
43 p4d = p4d_offset(pgd, addr);
44 if (p4d_present(*p4d)) {
45 pud = pud_offset(p4d, addr);
46 if (pud_present(*pud))
47 pmd = pmd_offset(pud, addr);
48 }
49 }
50 return (pte_t *) pmd;
51 }
52
53 /*
54 * This function checks for proper alignment of input addr and len parameters.
55 */
is_aligned_hugepage_range(unsigned long addr,unsigned long len)56 int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
57 {
58 if (len & ~HPAGE_MASK)
59 return -EINVAL;
60 if (addr & ~HPAGE_MASK)
61 return -EINVAL;
62 return 0;
63 }
64
pmd_huge(pmd_t pmd)65 int pmd_huge(pmd_t pmd)
66 {
67 return (pmd_val(pmd) & _PAGE_HUGE) != 0;
68 }
69
pud_huge(pud_t pud)70 int pud_huge(pud_t pud)
71 {
72 return (pud_val(pud) & _PAGE_HUGE) != 0;
73 }
74
pmd_to_entrylo(unsigned long pmd_val)75 uint64_t pmd_to_entrylo(unsigned long pmd_val)
76 {
77 uint64_t val;
78 /* PMD as PTE. Must be huge page */
79 if (!pmd_huge(__pmd(pmd_val)))
80 panic("%s", __func__);
81
82 val = pmd_val ^ _PAGE_HUGE;
83 val |= ((val & _PAGE_HGLOBAL) >>
84 (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
85
86 return val;
87 }
88
