LXR linux/arch/x86/include/asm/pgalloc.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_PGALLOC_H
   3#define _ASM_X86_PGALLOC_H
   4
   5#include <linux/threads.h>
   6#include <linux/mm.h>           /* for struct page */
   7#include <linux/pagemap.h>
   8
   9#define __HAVE_ARCH_PTE_ALLOC_ONE
  10#define __HAVE_ARCH_PGD_FREE
  11#include <asm-generic/pgalloc.h>
  12
  13static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
  14
  15#ifdef CONFIG_PARAVIRT_XXL
  16#include <asm/paravirt.h>
  17#else
  18#define paravirt_pgd_alloc(mm)  __paravirt_pgd_alloc(mm)
  19static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
  20static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)  {}
  21static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)  {}
  22static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
  23                                            unsigned long start, unsigned long count) {}
  24static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)  {}
  25static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)  {}
  26static inline void paravirt_release_pte(unsigned long pfn) {}
  27static inline void paravirt_release_pmd(unsigned long pfn) {}
  28static inline void paravirt_release_pud(unsigned long pfn) {}
  29static inline void paravirt_release_p4d(unsigned long pfn) {}
  30#endif
  31
  32/*
  33 * Flags to use when allocating a user page table page.
  34 */
  35extern gfp_t __userpte_alloc_gfp;
  36
  37#ifdef CONFIG_PAGE_TABLE_ISOLATION
  38/*
  39 * Instead of one PGD, we acquire two PGDs.  Being order-1, it is
  40 * both 8k in size and 8k-aligned.  That lets us just flip bit 12
  41 * in a pointer to swap between the two 4k halves.
  42 */
  43#define PGD_ALLOCATION_ORDER 1
  44#else
  45#define PGD_ALLOCATION_ORDER 0
  46#endif
  47
  48/*
  49 * Allocate and free page tables.
  50 */
  51extern pgd_t *pgd_alloc(struct mm_struct *);
  52extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  53
  54extern pgtable_t pte_alloc_one(struct mm_struct *);
  55
  56extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  57
  58static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
  59                                  unsigned long address)
  60{
  61        ___pte_free_tlb(tlb, pte);
  62}
  63
  64static inline void pmd_populate_kernel(struct mm_struct *mm,
  65                                       pmd_t *pmd, pte_t *pte)
  66{
  67        paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  68        set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  69}
  70
  71static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
  72                                       pmd_t *pmd, pte_t *pte)
  73{
  74        paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  75        set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  76}
  77
  78static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  79                                struct page *pte)
  80{
  81        unsigned long pfn = page_to_pfn(pte);
  82
  83        paravirt_alloc_pte(mm, pfn);
  84        set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  85}
  86
  87#define pmd_pgtable(pmd) pmd_page(pmd)
  88
  89#if CONFIG_PGTABLE_LEVELS > 2
  90extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
  91
  92static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
  93                                  unsigned long address)
  94{
  95        ___pmd_free_tlb(tlb, pmd);
  96}
  97
  98#ifdef CONFIG_X86_PAE
  99extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
 100#else   /* !CONFIG_X86_PAE */
 101static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 102{
 103        paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
 104        set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
 105}
 106
 107static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 108{
 109        paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
 110        set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
 111}
 112#endif  /* CONFIG_X86_PAE */
 113
 114#if CONFIG_PGTABLE_LEVELS > 3
 115static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
 116{
 117        paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
 118        set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
 119}
 120
 121static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
 122{
 123        paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
 124        set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
 125}
 126
 127extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 128
 129static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 130                                  unsigned long address)
 131{
 132        ___pud_free_tlb(tlb, pud);
 133}
 134
 135#if CONFIG_PGTABLE_LEVELS > 4
 136static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
 137{
 138        if (!pgtable_l5_enabled())
 139                return;
 140        paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
 141        set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
 142}
 143
 144static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
 145{
 146        if (!pgtable_l5_enabled())
 147                return;
 148        paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
 149        set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
 150}
 151
 152static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
 153{
 154        gfp_t gfp = GFP_KERNEL_ACCOUNT;
 155
 156        if (mm == &init_mm)
 157                gfp &= ~__GFP_ACCOUNT;
 158        return (p4d_t *)get_zeroed_page(gfp);
 159}
 160
 161static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 162{
 163        if (!pgtable_l5_enabled())
 164                return;
 165
 166        BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
 167        free_page((unsigned long)p4d);
 168}
 169
 170extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
 171
 172static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
 173                                  unsigned long address)
 174{
 175        if (pgtable_l5_enabled())
 176                ___p4d_free_tlb(tlb, p4d);
 177}
 178
 179#endif  /* CONFIG_PGTABLE_LEVELS > 4 */
 180#endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 181#endif  /* CONFIG_PGTABLE_LEVELS > 2 */
 182
 183#endif /* _ASM_X86_PGALLOC_H */
 184