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/* 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/sbi.h>
#include <asm/tlb.h>
#ifdef CONFIG_MMU
#define __HAVE_ARCH_PUD_FREE
#include <asm-generic/pgalloc.h>
/*
* While riscv platforms with riscv_ipi_for_rfence as true require an IPI to
* perform TLB shootdown, some platforms with riscv_ipi_for_rfence as false use
* SBI to perform TLB shootdown. To keep software pagetable walkers safe in this
* case we switch to RCU based table free (MMU_GATHER_RCU_TABLE_FREE). See the
* comment below 'ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE' in include/asm-generic/tlb.h
* for more details.
*/
static inline void riscv_tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt)
{
if (riscv_use_sbi_for_rfence()) {
tlb_remove_ptdesc(tlb, pt);
} else {
pagetable_dtor(pt);
tlb_remove_page_ptdesc(tlb, pt);
}
}
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_free pud_free
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
if (pgtable_l4_enabled)
__pud_free(mm, pud);
}
static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
unsigned long addr)
{
if (pgtable_l4_enabled)
riscv_tlb_remove_ptdesc(tlb, virt_to_ptdesc(pud));
}
static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long addr)
{
if (pgtable_l5_enabled)
riscv_tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
}
#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_alloc(mm, 0);
if (likely(pgd != NULL)) {
/* Copy kernel mappings */
sync_kernel_mappings(pgd);
}
return pgd;
}
#ifndef __PAGETABLE_PMD_FOLDED
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
unsigned long addr)
{
riscv_tlb_remove_ptdesc(tlb, virt_to_ptdesc(pmd));
}
#endif /* __PAGETABLE_PMD_FOLDED */
static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
unsigned long addr)
{
riscv_tlb_remove_ptdesc(tlb, page_ptdesc(pte));
}
#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_PGALLOC_H */
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