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#include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  11
  12static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
  13
  14#ifdef CONFIG_PARAVIRT_XXL
  15#include <asm/paravirt.h>
  16#else
  17#define paravirt_pgd_alloc(mm)  __paravirt_pgd_alloc(mm)
  18static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
  19static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)  {}
  20static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)  {}
  21static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
  22                                            unsigned long start, unsigned long count) {}
  23static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)  {}
  24static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)  {}
  25static inline void paravirt_release_pte(unsigned long pfn) {}
  26static inline void paravirt_release_pmd(unsigned long pfn) {}
  27static inline void paravirt_release_pud(unsigned long pfn) {}
  28static inline void paravirt_release_p4d(unsigned long pfn) {}
  29#endif
  30
  31/*
  32 * Flags to use when allocating a user page table page.
  33 */
  34extern gfp_t __userpte_alloc_gfp;
  35
  36#ifdef CONFIG_PAGE_TABLE_ISOLATION
  37/*
  38 * Instead of one PGD, we acquire two PGDs.  Being order-1, it is
  39 * both 8k in size and 8k-aligned.  That lets us just flip bit 12
  40 * in a pointer to swap between the two 4k halves.
  41 */
  42#define PGD_ALLOCATION_ORDER 1
  43#else
  44#define PGD_ALLOCATION_ORDER 0
  45#endif
  46
  47/*
  48 * Allocate and free page tables.
  49 */
  50extern pgd_t *pgd_alloc(struct mm_struct *);
  51extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  52
  53extern pgtable_t pte_alloc_one(struct mm_struct *);
  54
  55extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  56
  57static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
  58                                  unsigned long address)
  59{
  60        ___pte_free_tlb(tlb, pte);
  61}
  62
  63static inline void pmd_populate_kernel(struct mm_struct *mm,
  64                                       pmd_t *pmd, pte_t *pte)
  65{
  66        paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  67        set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  68}
  69
  70static inline void pmd_populate_kernel_safe(struct mm_struct *mm,
  71                                       pmd_t *pmd, pte_t *pte)
  72{
  73        paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  74        set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  75}
  76
  77static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  78                                struct page *pte)
  79{
  80        unsigned long pfn = page_to_pfn(pte);
  81
  82        paravirt_alloc_pte(mm, pfn);
  83        set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  84}
  85
  86#define pmd_pgtable(pmd) pmd_page(pmd)
  87
  88#if CONFIG_PGTABLE_LEVELS > 2
  89static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  90{
  91        struct page *page;
  92        gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
  93
  94        if (mm == &init_mm)
  95                gfp &= ~__GFP_ACCOUNT;
  96        page = alloc_pages(gfp, 0);
  97        if (!page)
  98                return NULL;
  99        if (!pgtable_pmd_page_ctor(page)) {
 100                __free_pages(page, 0);
 101                return NULL;
 102        }
 103        return (pmd_t *)page_address(page);
 104}
 105
 106static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 107{
 108        BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
 109        pgtable_pmd_page_dtor(virt_to_page(pmd));
 110        free_page((unsigned long)pmd);
 111}
 112
 113extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
 114
 115static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 116                                  unsigned long address)
 117{
 118        ___pmd_free_tlb(tlb, pmd);
 119}
 120
 121#ifdef CONFIG_X86_PAE
 122extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
 123#else   /* !CONFIG_X86_PAE */
 124static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 125{
 126        paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
 127        set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
 128}
 129
 130static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 131{
 132        paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
 133        set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd)));
 134}
 135#endif  /* CONFIG_X86_PAE */
 136
 137#if CONFIG_PGTABLE_LEVELS > 3
 138static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
 139{
 140        paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
 141        set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
 142}
 143
 144static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
 145{
 146        paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
 147        set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
 148}
 149
 150static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 151{
 152        gfp_t gfp = GFP_KERNEL_ACCOUNT;
 153
 154        if (mm == &init_mm)
 155                gfp &= ~__GFP_ACCOUNT;
 156        return (pud_t *)get_zeroed_page(gfp);
 157}
 158
 159static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 160{
 161        BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
 162        free_page((unsigned long)pud);
 163}
 164
 165extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 166
 167static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 168                                  unsigned long address)
 169{
 170        ___pud_free_tlb(tlb, pud);
 171}
 172
 173#if CONFIG_PGTABLE_LEVELS > 4
 174static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
 175{
 176        if (!pgtable_l5_enabled())
 177                return;
 178        paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
 179        set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
 180}
 181
 182static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
 183{
 184        if (!pgtable_l5_enabled())
 185                return;
 186        paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
 187        set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
 188}
 189
 190static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
 191{
 192        gfp_t gfp = GFP_KERNEL_ACCOUNT;
 193
 194        if (mm == &init_mm)
 195                gfp &= ~__GFP_ACCOUNT;
 196        return (p4d_t *)get_zeroed_page(gfp);
 197}
 198
 199static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 200{
 201        if (!pgtable_l5_enabled())
 202                return;
 203
 204        BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
 205        free_page((unsigned long)p4d);
 206}
 207
 208extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
 209
 210static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
 211                                  unsigned long address)
 212{
 213        if (pgtable_l5_enabled())
 214                ___p4d_free_tlb(tlb, p4d);
 215}
 216
 217#endif  /* CONFIG_PGTABLE_LEVELS > 4 */
 218#endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 219#endif  /* CONFIG_PGTABLE_LEVELS > 2 */
 220
 221#endif /* _ASM_X86_PGALLOC_H */
 222