mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-25 19:42:19 +00:00
98a7e47faa
Four architectures currently implement 5-level pgtables: arm64, riscv, x86 and s390. The first three have essentially the same implementation for p4d_alloc_one() and p4d_free(), so we've got an opportunity to reduce duplication like at the lower levels. Provide a generic version of p4d_alloc_one() and p4d_free(), and make use of it on those architectures. Their implementation is the same as at PUD level, except that p4d_free() performs a runtime check by calling mm_p4d_folded(). 5-level pgtables depend on a runtime-detected hardware feature on all supported architectures, so we might as well include this check in the generic implementation. No runtime check is required in p4d_alloc_one() as the top-level p4d_alloc() already does the required check. Link: https://lkml.kernel.org/r/26d69c74a29183ecc335b9b407040d8e4cd70c6a.1736317725.git.zhengqi.arch@bytedance.com Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> [asm-generic] Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jann Horn <jannh@google.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Cc: Will Deacon <will@kernel.org> Cc: Yu Zhao <yuzhao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/* 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>
|
|
|
|
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
|
|
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) {
|
|
struct ptdesc *ptdesc = virt_to_ptdesc(pud);
|
|
|
|
pagetable_pud_dtor(ptdesc);
|
|
riscv_tlb_remove_ptdesc(tlb, ptdesc);
|
|
}
|
|
}
|
|
|
|
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_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
|
|
|
|
static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
|
|
unsigned long addr)
|
|
{
|
|
struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
|
|
|
|
pagetable_pmd_dtor(ptdesc);
|
|
riscv_tlb_remove_ptdesc(tlb, ptdesc);
|
|
}
|
|
|
|
#endif /* __PAGETABLE_PMD_FOLDED */
|
|
|
|
static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
|
|
unsigned long addr)
|
|
{
|
|
struct ptdesc *ptdesc = page_ptdesc(pte);
|
|
|
|
pagetable_pte_dtor(ptdesc);
|
|
riscv_tlb_remove_ptdesc(tlb, ptdesc);
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#endif /* _ASM_RISCV_PGALLOC_H */
|