[linux-2.6-block.git] / arch / s390 / include / asm / pgalloc.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2000
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/pgalloc.h"
 *    Copyright (C) 1994  Linus Torvalds
 */

#ifndef _S390_PGALLOC_H
#define _S390_PGALLOC_H

#include <linux/threads.h>
#include <linux/string.h>
#include <linux/gfp.h>
#include <linux/mm.h>

#define CRST_ALLOC_ORDER 2

unsigned long *crst_table_alloc(struct mm_struct *);
void crst_table_free(struct mm_struct *, unsigned long *);

unsigned long *page_table_alloc(struct mm_struct *);
struct ptdesc *page_table_alloc_pgste(struct mm_struct *mm);
void page_table_free(struct mm_struct *, unsigned long *);
void page_table_free_pgste(struct ptdesc *ptdesc);

static inline void crst_table_init(unsigned long *crst, unsigned long entry)
{
	memset64((u64 *)crst, entry, _CRST_ENTRIES);
}

int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);

static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
					     unsigned long len)
{
	int rc;

	if (addr + len > mm->context.asce_limit &&
	    addr + len <= TASK_SIZE) {
		rc = crst_table_upgrade(mm, addr + len);
		if (rc)
			return (unsigned long) rc;
	}
	return addr;
}

static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
{
	unsigned long *table = crst_table_alloc(mm);

	if (!table)
		return NULL;
	crst_table_init(table, _REGION2_ENTRY_EMPTY);
	pagetable_p4d_ctor(virt_to_ptdesc(table));

	return (p4d_t *) table;
}

static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
	if (mm_p4d_folded(mm))
		return;

	pagetable_dtor(virt_to_ptdesc(p4d));
	crst_table_free(mm, (unsigned long *) p4d);
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
{
	unsigned long *table = crst_table_alloc(mm);

	if (!table)
		return NULL;
	crst_table_init(table, _REGION3_ENTRY_EMPTY);
	pagetable_pud_ctor(virt_to_ptdesc(table));

	return (pud_t *) table;
}

static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	if (mm_pud_folded(mm))
		return;

	pagetable_dtor(virt_to_ptdesc(pud));
	crst_table_free(mm, (unsigned long *) pud);
}

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
	unsigned long *table = crst_table_alloc(mm);

	if (!table)
		return NULL;
	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
	if (!pagetable_pmd_ctor(mm, virt_to_ptdesc(table))) {
		crst_table_free(mm, table);
		return NULL;
	}
	return (pmd_t *) table;
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	if (mm_pmd_folded(mm))
		return;
	pagetable_dtor(virt_to_ptdesc(pmd));
	crst_table_free(mm, (unsigned long *) pmd);
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
	set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
}

static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
	set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	unsigned long *table = crst_table_alloc(mm);

	if (!table)
		return NULL;
	pagetable_pgd_ctor(virt_to_ptdesc(table));

	return (pgd_t *) table;
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	pagetable_dtor(virt_to_ptdesc(pgd));
	crst_table_free(mm, (unsigned long *) pgd);
}

static inline void pmd_populate(struct mm_struct *mm,
				pmd_t *pmd, pgtable_t pte)
{
	set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
}

#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)

/*
 * page table entry allocation/free routines.
 */
#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))

#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)

/* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
#define pte_free_defer pte_free_defer
void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);

void vmem_map_init(void);
void *vmem_crst_alloc(unsigned long val);
pte_t *vmem_pte_alloc(void);

unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
void base_asce_free(unsigned long asce);

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