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1caf170df9
Provide base_asce_alloc() and base_asce_free() helper functions which can be used to allocate an ASCE and all required region, segment and page tables required to access memory regions of the virtual kernel address space. Both, the ASCE and all tables, do not use any features that correspond to e.g. enhanced DAT features. This is required for some I/O functions that pass an ASCE, like e.g. some service call requests, but which may not use any enhanced features. Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2000
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/pgalloc.h"
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* Copyright (C) 1994 Linus Torvalds
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*/
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#ifndef _S390_PGALLOC_H
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#define _S390_PGALLOC_H
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#include <linux/threads.h>
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#include <linux/string.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#define CRST_ALLOC_ORDER 2
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unsigned long *crst_table_alloc(struct mm_struct *);
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void crst_table_free(struct mm_struct *, unsigned long *);
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unsigned long *page_table_alloc(struct mm_struct *);
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struct page *page_table_alloc_pgste(struct mm_struct *mm);
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void page_table_free(struct mm_struct *, unsigned long *);
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void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
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void page_table_free_pgste(struct page *page);
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extern int page_table_allocate_pgste;
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static inline void crst_table_init(unsigned long *crst, unsigned long entry)
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{
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memset64((u64 *)crst, entry, _CRST_ENTRIES);
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}
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static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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{
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if (mm->context.asce_limit <= _REGION3_SIZE)
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return _SEGMENT_ENTRY_EMPTY;
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if (mm->context.asce_limit <= _REGION2_SIZE)
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return _REGION3_ENTRY_EMPTY;
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if (mm->context.asce_limit <= _REGION1_SIZE)
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return _REGION2_ENTRY_EMPTY;
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return _REGION1_ENTRY_EMPTY;
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}
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int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
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void crst_table_downgrade(struct mm_struct *);
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static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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unsigned long *table = crst_table_alloc(mm);
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if (table)
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crst_table_init(table, _REGION2_ENTRY_EMPTY);
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return (p4d_t *) table;
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}
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#define p4d_free(mm, p4d) crst_table_free(mm, (unsigned long *) p4d)
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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unsigned long *table = crst_table_alloc(mm);
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if (table)
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crst_table_init(table, _REGION3_ENTRY_EMPTY);
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return (pud_t *) table;
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}
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#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
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{
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unsigned long *table = crst_table_alloc(mm);
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if (!table)
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return NULL;
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crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
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if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
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crst_table_free(mm, table);
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return NULL;
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}
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return (pmd_t *) table;
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}
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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pgtable_pmd_page_dtor(virt_to_page(pmd));
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crst_table_free(mm, (unsigned long *) pmd);
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}
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
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{
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pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d);
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}
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static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
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{
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p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud);
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}
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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unsigned long *table = crst_table_alloc(mm);
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if (!table)
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return NULL;
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if (mm->context.asce_limit == _REGION3_SIZE) {
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/* Forking a compat process with 2 page table levels */
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if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
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crst_table_free(mm, table);
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return NULL;
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}
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}
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return (pgd_t *) table;
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}
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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if (mm->context.asce_limit == _REGION3_SIZE)
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pgtable_pmd_page_dtor(virt_to_page(pgd));
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crst_table_free(mm, (unsigned long *) pgd);
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}
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static inline void pmd_populate(struct mm_struct *mm,
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pmd_t *pmd, pgtable_t pte)
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{
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pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
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}
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#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
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#define pmd_pgtable(pmd) \
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(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
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/*
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* page table entry allocation/free routines.
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*/
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#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
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#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
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#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
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#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
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extern void rcu_table_freelist_finish(void);
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void vmem_map_init(void);
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void *vmem_crst_alloc(unsigned long val);
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pte_t *vmem_pte_alloc(void);
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unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
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void base_asce_free(unsigned long asce);
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#endif /* _S390_PGALLOC_H */
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