LXR linux/arch/s390/include/asm/pgalloc.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  S390 version
   4 *    Copyright IBM Corp. 1999, 2000
   5 *    Author(s): Hartmut Penner (hp@de.ibm.com)
   6 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   7 *
   8 *  Derived from "include/asm-i386/pgalloc.h"
   9 *    Copyright (C) 1994  Linus Torvalds
  10 */
  11
  12#ifndef _S390_PGALLOC_H
  13#define _S390_PGALLOC_H
  14
  15#include <linux/threads.h>
  16#include <linux/string.h>
  17#include <linux/gfp.h>
  18#include <linux/mm.h>
  19
  20#define CRST_ALLOC_ORDER 2
  21
  22unsigned long *crst_table_alloc(struct mm_struct *);
  23void crst_table_free(struct mm_struct *, unsigned long *);
  24
  25unsigned long *page_table_alloc(struct mm_struct *);
  26struct page *page_table_alloc_pgste(struct mm_struct *mm);
  27void page_table_free(struct mm_struct *, unsigned long *);
  28void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
  29void page_table_free_pgste(struct page *page);
  30extern int page_table_allocate_pgste;
  31
  32static inline void crst_table_init(unsigned long *crst, unsigned long entry)
  33{
  34        memset64((u64 *)crst, entry, _CRST_ENTRIES);
  35}
  36
  37static inline unsigned long pgd_entry_type(struct mm_struct *mm)
  38{
  39        if (mm_pmd_folded(mm))
  40                return _SEGMENT_ENTRY_EMPTY;
  41        if (mm_pud_folded(mm))
  42                return _REGION3_ENTRY_EMPTY;
  43        if (mm_p4d_folded(mm))
  44                return _REGION2_ENTRY_EMPTY;
  45        return _REGION1_ENTRY_EMPTY;
  46}
  47
  48int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
  49void crst_table_downgrade(struct mm_struct *);
  50
  51static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
  52{
  53        unsigned long *table = crst_table_alloc(mm);
  54
  55        if (table)
  56                crst_table_init(table, _REGION2_ENTRY_EMPTY);
  57        return (p4d_t *) table;
  58}
  59#define p4d_free(mm, p4d) crst_table_free(mm, (unsigned long *) p4d)
  60
  61static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
  62{
  63        unsigned long *table = crst_table_alloc(mm);
  64        if (table)
  65                crst_table_init(table, _REGION3_ENTRY_EMPTY);
  66        return (pud_t *) table;
  67}
  68#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
  69
  70static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
  71{
  72        unsigned long *table = crst_table_alloc(mm);
  73
  74        if (!table)
  75                return NULL;
  76        crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
  77        if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
  78                crst_table_free(mm, table);
  79                return NULL;
  80        }
  81        return (pmd_t *) table;
  82}
  83
  84static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  85{
  86        pgtable_pmd_page_dtor(virt_to_page(pmd));
  87        crst_table_free(mm, (unsigned long *) pmd);
  88}
  89
  90static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
  91{
  92        pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d);
  93}
  94
  95static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
  96{
  97        p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud);
  98}
  99
 100static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 101{
 102        pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
 103}
 104
 105static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 106{
 107        unsigned long *table = crst_table_alloc(mm);
 108
 109        if (!table)
 110                return NULL;
 111        if (mm->context.asce_limit == _REGION3_SIZE) {
 112                /* Forking a compat process with 2 page table levels */
 113                if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
 114                        crst_table_free(mm, table);
 115                        return NULL;
 116                }
 117        }
 118        return (pgd_t *) table;
 119}
 120
 121static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 122{
 123        if (mm->context.asce_limit == _REGION3_SIZE)
 124                pgtable_pmd_page_dtor(virt_to_page(pgd));
 125        crst_table_free(mm, (unsigned long *) pgd);
 126}
 127
 128static inline void pmd_populate(struct mm_struct *mm,
 129                                pmd_t *pmd, pgtable_t pte)
 130{
 131        pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
 132}
 133
 134#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
 135
 136#define pmd_pgtable(pmd) \
 137        (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
 138
 139/*
 140 * page table entry allocation/free routines.
 141 */
 142#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
 143#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
 144
 145#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
 146#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
 147
 148extern void rcu_table_freelist_finish(void);
 149
 150void vmem_map_init(void);
 151void *vmem_crst_alloc(unsigned long val);
 152pte_t *vmem_pte_alloc(void);
 153
 154unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
 155void base_asce_free(unsigned long asce);
 156
 157#endif /* _S390_PGALLOC_H */
 158