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

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_PGALLOC_H
#define _ASM_RISCV_PGALLOC_H

#include <linux/mm.h>
#include <asm/tlb.h>

#ifdef CONFIG_MMU
#define __HAVE_ARCH_PUD_ALLOC_ONE
#define __HAVE_ARCH_PUD_FREE
#include <asm-generic/pgalloc.h>

static inline void pmd_populate_kernel(struct mm_struct *mm,
	pmd_t *pmd, pte_t *pte)
{
	unsigned long pfn = virt_to_pfn(pte);

	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

static inline void pmd_populate(struct mm_struct *mm,
	pmd_t *pmd, pgtable_t pte)
{
	unsigned long pfn = virt_to_pfn(page_address(pte));

	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

#ifndef __PAGETABLE_PMD_FOLDED
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	unsigned long pfn = virt_to_pfn(pmd);

	set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
	if (pgtable_l4_enabled) {
		unsigned long pfn = virt_to_pfn(pud);

		set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,
				     pud_t *pud)
{
	if (pgtable_l4_enabled) {
		unsigned long pfn = virt_to_pfn(pud);

		set_p4d_safe(p4d,
			     __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
	if (pgtable_l5_enabled) {
		unsigned long pfn = virt_to_pfn(p4d);

		set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
				     p4d_t *p4d)
{
	if (pgtable_l5_enabled) {
		unsigned long pfn = virt_to_pfn(p4d);

		set_pgd_safe(pgd,
			     __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

#define pud_alloc_one pud_alloc_one
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	if (pgtable_l4_enabled)
		return __pud_alloc_one(mm, addr);

	return NULL;
}

#define pud_free pud_free
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	if (pgtable_l4_enabled)
		__pud_free(mm, pud);
}

#define __pud_free_tlb(tlb, pud, addr)					\
do {									\
	if (pgtable_l4_enabled) {					\
		pagetable_pud_dtor(virt_to_ptdesc(pud));		\
		tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pud));	\
	}								\
} while (0)

#define p4d_alloc_one p4d_alloc_one
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	if (pgtable_l5_enabled) {
		gfp_t gfp = GFP_PGTABLE_USER;

		if (mm == &init_mm)
			gfp = GFP_PGTABLE_KERNEL;
		return (p4d_t *)get_zeroed_page(gfp);
	}

	return NULL;
}

static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
	BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
	free_page((unsigned long)p4d);
}

#define p4d_free p4d_free
static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
	if (pgtable_l5_enabled)
		__p4d_free(mm, p4d);
}

#define __p4d_free_tlb(tlb, p4d, addr)					\
do {									\
	if (pgtable_l5_enabled)						\
		tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(p4d));	\
} while (0)
#endif /* __PAGETABLE_PMD_FOLDED */

static inline void sync_kernel_mappings(pgd_t *pgd)
{
	memcpy(pgd + USER_PTRS_PER_PGD,
	       init_mm.pgd + USER_PTRS_PER_PGD,
	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd;

	pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
	if (likely(pgd != NULL)) {
		memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
		/* Copy kernel mappings */
		sync_kernel_mappings(pgd);
	}
	return pgd;
}

#ifndef __PAGETABLE_PMD_FOLDED

#define __pmd_free_tlb(tlb, pmd, addr)				\
do {								\
	pagetable_pmd_dtor(virt_to_ptdesc(pmd));		\
	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pmd));	\
} while (0)

#endif /* __PAGETABLE_PMD_FOLDED */

#define __pte_free_tlb(tlb, pte, buf)			\
do {							\
	pagetable_pte_dtor(page_ptdesc(pte));		\
	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\
} while (0)
#endif /* CONFIG_MMU */

#endif /* _ASM_RISCV_PGALLOC_H */
Commit	Line	Data
50acfb2b	1	/* SPDX-License-Identifier: GPL-2.0-only */
07037db5 PD	2	/*
	3	* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
	4	* Copyright (C) 2012 Regents of the University of California
07037db5 PD	5	*/
	6
	7	#ifndef _ASM_RISCV_PGALLOC_H
	8	#define _ASM_RISCV_PGALLOC_H
	9
	10	#include <linux/mm.h>
	11	#include <asm/tlb.h>
	12
6bd33e1e	13	#ifdef CONFIG_MMU
e8a62cc2 AG	14	#define __HAVE_ARCH_PUD_ALLOC_ONE
e8a62cc2 AG	15	#define __HAVE_ARCH_PUD_FREE
1355c31e	16	#include <asm-generic/pgalloc.h>
d1b46fe5	17
07037db5 PD	18	static inline void pmd_populate_kernel(struct mm_struct *mm,
	19	pmd_t pmd, pte_t pte)
	20	{
	21	unsigned long pfn = virt_to_pfn(pte);
	22
	23	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	24	}
	25
	26	static inline void pmd_populate(struct mm_struct *mm,
	27	pmd_t *pmd, pgtable_t pte)
	28	{
	29	unsigned long pfn = virt_to_pfn(page_address(pte));
	30
	31	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	32	}
	33
	34	#ifndef __PAGETABLE_PMD_FOLDED
	35	static inline void pud_populate(struct mm_struct mm, pud_t pud, pmd_t *pmd)
	36	{
	37	unsigned long pfn = virt_to_pfn(pmd);
	38
	39	set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	40	}
e8a62cc2 AG	41
	42	static inline void p4d_populate(struct mm_struct mm, p4d_t p4d, pud_t *pud)
	43	{
	44	if (pgtable_l4_enabled) {
	45	unsigned long pfn = virt_to_pfn(pud);
	46
	47	set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	48	}
	49	}
	50
	51	static inline void p4d_populate_safe(struct mm_struct mm, p4d_t p4d,
	52	pud_t *pud)
	53	{
	54	if (pgtable_l4_enabled) {
	55	unsigned long pfn = virt_to_pfn(pud);
	56
	57	set_p4d_safe(p4d,
	58	__p4d((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	59	}
	60	}
	61
d10efa21 QP	62	static inline void pgd_populate(struct mm_struct mm, pgd_t pgd, p4d_t *p4d)
	63	{
	64	if (pgtable_l5_enabled) {
	65	unsigned long pfn = virt_to_pfn(p4d);
	66
	67	set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	68	}
	69	}
	70
	71	static inline void pgd_populate_safe(struct mm_struct mm, pgd_t pgd,
	72	p4d_t *p4d)
	73	{
	74	if (pgtable_l5_enabled) {
	75	unsigned long pfn = virt_to_pfn(p4d);
	76
	77	set_pgd_safe(pgd,
	78	__pgd((pfn << _PAGE_PFN_SHIFT) \| _PAGE_TABLE));
	79	}
	80	}
	81
e8a62cc2 AG	82	#define pud_alloc_one pud_alloc_one
	83	static inline pud_t pud_alloc_one(struct mm_struct mm, unsigned long addr)
	84	{
	85	if (pgtable_l4_enabled)
	86	return __pud_alloc_one(mm, addr);
	87
	88	return NULL;
	89	}
	90
	91	#define pud_free pud_free
	92	static inline void pud_free(struct mm_struct mm, pud_t pud)
	93	{
	94	if (pgtable_l4_enabled)
	95	__pud_free(mm, pud);
	96	}
	97
8246601a JZ	98	#define __pud_free_tlb(tlb, pud, addr) \
	99	do { \
	100	if (pgtable_l4_enabled) { \
	101	pagetable_pud_dtor(virt_to_ptdesc(pud)); \
	102	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pud)); \
	103	} \
	104	} while (0)
d10efa21 QP	105
	106	#define p4d_alloc_one p4d_alloc_one
	107	static inline p4d_t p4d_alloc_one(struct mm_struct mm, unsigned long addr)
	108	{
	109	if (pgtable_l5_enabled) {
	110	gfp_t gfp = GFP_PGTABLE_USER;
	111
	112	if (mm == &init_mm)
	113	gfp = GFP_PGTABLE_KERNEL;
	114	return (p4d_t *)get_zeroed_page(gfp);
	115	}
	116
	117	return NULL;
	118	}
	119
	120	static inline void __p4d_free(struct mm_struct mm, p4d_t p4d)
	121	{
	122	BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
	123	free_page((unsigned long)p4d);
	124	}
	125
	126	#define p4d_free p4d_free
	127	static inline void p4d_free(struct mm_struct mm, p4d_t p4d)
	128	{
	129	if (pgtable_l5_enabled)
	130	__p4d_free(mm, p4d);
	131	}
	132
8246601a JZ	133	#define __p4d_free_tlb(tlb, p4d, addr) \
	134	do { \
	135	if (pgtable_l5_enabled) \
	136	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(p4d)); \
	137	} while (0)
07037db5 PD	138	#endif /* __PAGETABLE_PMD_FOLDED */
07037db5 PD	139
3f105a74 AG	140	static inline void sync_kernel_mappings(pgd_t *pgd)
	141	{
	142	memcpy(pgd + USER_PTRS_PER_PGD,
	143	init_mm.pgd + USER_PTRS_PER_PGD,
	144	(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
	145	}
	146
07037db5 PD	147	static inline pgd_t pgd_alloc(struct mm_struct mm)
	148	{
	149	pgd_t *pgd;
	150
	151	pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
	152	if (likely(pgd != NULL)) {
	153	memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
	154	/* Copy kernel mappings */
3f105a74	155	sync_kernel_mappings(pgd);
07037db5 PD	156	}
	157	return pgd;
	158	}
	159
07037db5 PD	160	#ifndef __PAGETABLE_PMD_FOLDED
07037db5 PD	161
8246601a JZ	162	#define __pmd_free_tlb(tlb, pmd, addr) \
	163	do { \
	164	pagetable_pmd_dtor(virt_to_ptdesc(pmd)); \
	165	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pmd)); \
	166	} while (0)
07037db5 PD	167
	168	#endif /* __PAGETABLE_PMD_FOLDED */
	169
380f2c1a VMO	170	#define __pte_free_tlb(tlb, pte, buf) \
	171	do { \
	172	pagetable_pte_dtor(page_ptdesc(pte)); \
	173	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\
07037db5	174	} while (0)
6bd33e1e	175	#endif /* CONFIG_MMU */
07037db5	176
07037db5	177	#endif /* _ASM_RISCV_PGALLOC_H */