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_noprof(struct mm_struct *);
 23#define crst_table_alloc(...)	alloc_hooks(crst_table_alloc_noprof(__VA_ARGS__))
 24void crst_table_free(struct mm_struct *, unsigned long *);
 25
 26unsigned long *page_table_alloc_noprof(struct mm_struct *);
 27#define page_table_alloc(...)	alloc_hooks(page_table_alloc_noprof(__VA_ARGS__))
 28void page_table_free(struct mm_struct *, unsigned long *);
 29
 30struct ptdesc *page_table_alloc_pgste_noprof(struct mm_struct *mm);
 31#define page_table_alloc_pgste(...)	alloc_hooks(page_table_alloc_pgste_noprof(__VA_ARGS__))
 32void page_table_free_pgste(struct ptdesc *ptdesc);
 33
 34static inline void crst_table_init(unsigned long *crst, unsigned long entry)
 35{
 36	memset64((u64 *)crst, entry, _CRST_ENTRIES);
 37}
 38
 39int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
 40
 41static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
 42					     unsigned long len)
 43{
 44	int rc;
 45
 46	if (addr + len > mm->context.asce_limit &&
 47	    addr + len <= TASK_SIZE) {
 48		rc = crst_table_upgrade(mm, addr + len);
 49		if (rc)
 50			return (unsigned long) rc;
 51	}
 52	return addr;
 53}
 54
 55static inline p4d_t *p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long address)
 56{
 57	unsigned long *table = crst_table_alloc_noprof(mm);
 58
 59	if (!table)
 60		return NULL;
 61	crst_table_init(table, _REGION2_ENTRY_EMPTY);
 62	pagetable_p4d_ctor(virt_to_ptdesc(table));
 63
 64	return (p4d_t *) table;
 65}
 66#define p4d_alloc_one(...)	alloc_hooks(p4d_alloc_one_noprof(__VA_ARGS__))
 67
 68static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 69{
 70	if (mm_p4d_folded(mm))
 71		return;
 72
 73	pagetable_dtor(virt_to_ptdesc(p4d));
 74	crst_table_free(mm, (unsigned long *) p4d);
 75}
 76
 77static inline pud_t *pud_alloc_one_noprof(struct mm_struct *mm, unsigned long address)
 78{
 79	unsigned long *table = crst_table_alloc_noprof(mm);
 80
 81	if (!table)
 82		return NULL;
 83	crst_table_init(table, _REGION3_ENTRY_EMPTY);
 84	pagetable_pud_ctor(virt_to_ptdesc(table));
 85
 86	return (pud_t *) table;
 87}
 88#define pud_alloc_one(...)	alloc_hooks(pud_alloc_one_noprof(__VA_ARGS__))
 89
 90static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 91{
 92	if (mm_pud_folded(mm))
 93		return;
 94
 95	pagetable_dtor(virt_to_ptdesc(pud));
 96	crst_table_free(mm, (unsigned long *) pud);
 97}
 98
 99static inline pmd_t *pmd_alloc_one_noprof(struct mm_struct *mm, unsigned long vmaddr)
100{
101	unsigned long *table = crst_table_alloc_noprof(mm);
102
103	if (!table)
104		return NULL;
105	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
106	if (!pagetable_pmd_ctor(mm, virt_to_ptdesc(table))) {
107		crst_table_free(mm, table);
108		return NULL;
109	}
110	return (pmd_t *) table;
111}
112#define pmd_alloc_one(...)	alloc_hooks(pmd_alloc_one_noprof(__VA_ARGS__))
113
114static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
115{
116	if (mm_pmd_folded(mm))
117		return;
118	pagetable_dtor(virt_to_ptdesc(pmd));
119	crst_table_free(mm, (unsigned long *) pmd);
120}
121
122static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
123{
124	set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
125}
126
127static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
128{
129	set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
130}
131
132static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
133{
134	set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
135}
136
137static inline pgd_t *pgd_alloc_noprof(struct mm_struct *mm)
138{
139	unsigned long *table = crst_table_alloc_noprof(mm);
140
141	if (!table)
142		return NULL;
143	pagetable_pgd_ctor(virt_to_ptdesc(table));
144
145	return (pgd_t *) table;
146}
147#define pgd_alloc(...)	alloc_hooks(pgd_alloc_noprof(__VA_ARGS__))
148
149static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
150{
151	pagetable_dtor(virt_to_ptdesc(pgd));
152	crst_table_free(mm, (unsigned long *) pgd);
153}
154
155static inline void pmd_populate(struct mm_struct *mm,
156				pmd_t *pmd, pgtable_t pte)
157{
158	set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
159}
160
161#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
162
163/*
164 * page table entry allocation/free routines.
165 */
166#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
167#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
168
169#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
170#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
171
172/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
173#define pte_free_defer pte_free_defer
174void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
175
176void vmem_map_init(void);
177void *vmem_crst_alloc(unsigned long val);
178pte_t *vmem_pte_alloc(void);
179
180unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
181void base_asce_free(unsigned long asce);
182
183#endif /* _S390_PGALLOC_H */