arch/loongarch/include/asm/hugetlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  */
   5
   6 #ifndef __ASM_HUGETLB_H
   7 #define __ASM_HUGETLB_H
   8
   9 #include <asm/page.h>
  10
  11 uint64_t pmd_to_entrylo(unsigned long pmd_val);
  12
  13 #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
  14 static inline int prepare_hugepage_range(struct file *file,
  15                                          unsigned long addr,
  16                                          unsigned long len)
  17 {
  18         unsigned long task_size = STACK_TOP;
  19
  20         if (len > task_size)
  21                 return -ENOMEM;
  22         if (task_size - len < addr)
  23                 return -EINVAL;
  24         return 0;
  25 }
  26
  27 #define __HAVE_ARCH_HUGE_PTE_CLEAR
  28 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
  29                                   pte_t *ptep, unsigned long sz)
  30 {
  31         pte_t clear;
  32
  33         pte_val(clear) = (unsigned long)invalid_pte_table;
  34         set_pte_at(mm, addr, ptep, clear);
  35 }
  36
  37 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
  38 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  39                                             unsigned long addr, pte_t *ptep)
  40 {
  41         pte_t clear;
  42         pte_t pte = ptep_get(ptep);
  43
  44         pte_val(clear) = (unsigned long)invalid_pte_table;
  45         set_pte_at(mm, addr, ptep, clear);
  46         return pte;
  47 }
  48
  49 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
  50 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
  51                                           unsigned long addr, pte_t *ptep)
  52 {
  53         pte_t pte;
  54
  55         pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  56         flush_tlb_page(vma, addr);
  57         return pte;
  58 }
  59
  60 #define __HAVE_ARCH_HUGE_PTE_NONE
  61 static inline int huge_pte_none(pte_t pte)
  62 {
  63         unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  64         return !val || (val == (unsigned long)invalid_pte_table);
  65 }
  66
  67 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
  68 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  69                                              unsigned long addr,
  70                                              pte_t *ptep, pte_t pte,
  71                                              int dirty)
  72 {
  73         int changed = !pte_same(ptep_get(ptep), pte);
  74
  75         if (changed) {
  76                 set_pte_at(vma->vm_mm, addr, ptep, pte);
  77                 /*
  78                  * There could be some standard sized pages in there,
  79                  * get them all.
  80                  */
  81                 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
  82         }
  83         return changed;
  84 }
  85
  86 #include <asm-generic/hugetlb.h>
  87
  88 #endif /* __ASM_HUGETLB_H */