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22c4e80466
Patch series "mm/sparse-vmemmap: Generalise helpers and enable for LoongArch", v14. This series is in order to enable sparse-vmemmap for LoongArch. But LoongArch cannot use generic helpers directly because MIPS&LoongArch need to call pgd_init()/pud_init()/pmd_init() when populating page tables. So we adjust the prototypes of p?d_init() to make generic helpers can call them, then enable sparse-vmemmap with generic helpers, and to be further, generalise vmemmap_populate_hugepages() for ARM64, X86 and LoongArch. This patch (of 4): We are preparing to add sparse vmemmap support to LoongArch. MIPS and LoongArch need to call pgd_init()/pud_init()/pmd_init() when populating page tables, so adjust their prototypes to make generic helpers can call them. NIOS2 declares pmd_init() but doesn't use, just remove it to avoid build errors. Link: https://lkml.kernel.org/r/20221027125253.3458989-1-chenhuacai@loongson.cn Link: https://lkml.kernel.org/r/20221027125253.3458989-2-chenhuacai@loongson.cn Signed-off-by: Feiyang Chen <chenfeiyang@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Guo Ren <guoren@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Will Deacon <will@kernel.org> Cc: Xuefeng Li <lixuefeng@loongson.cn> Cc: Xuerui Wang <kernel@xen0n.name> Cc: Min Zhou <zhoumin@loongson.cn> Cc: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
133 lines
2.5 KiB
C
133 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *ret, *init;
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ret = (pgd_t *) __get_free_page(GFP_KERNEL);
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if (ret) {
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init = pgd_offset(&init_mm, 0UL);
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pgd_init(ret);
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memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
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(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(pgd_alloc);
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void pgd_init(void *addr)
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{
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unsigned long *p, *end;
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unsigned long entry;
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#if !defined(__PAGETABLE_PUD_FOLDED)
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entry = (unsigned long)invalid_pud_table;
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#elif !defined(__PAGETABLE_PMD_FOLDED)
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entry = (unsigned long)invalid_pmd_table;
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#else
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entry = (unsigned long)invalid_pte_table;
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#endif
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PGD;
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do {
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p[0] = entry;
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p[1] = entry;
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p[2] = entry;
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p[3] = entry;
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p[4] = entry;
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p += 8;
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p[-3] = entry;
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p[-2] = entry;
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p[-1] = entry;
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} while (p != end);
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}
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EXPORT_SYMBOL_GPL(pgd_init);
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#ifndef __PAGETABLE_PMD_FOLDED
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void pmd_init(void *addr)
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{
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unsigned long *p, *end;
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unsigned long pagetable = (unsigned long)invalid_pte_table;
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PMD;
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do {
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p[0] = pagetable;
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p[1] = pagetable;
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p[2] = pagetable;
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p[3] = pagetable;
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p[4] = pagetable;
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p += 8;
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p[-3] = pagetable;
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p[-2] = pagetable;
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p[-1] = pagetable;
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} while (p != end);
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}
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EXPORT_SYMBOL_GPL(pmd_init);
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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void pud_init(void *addr)
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{
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unsigned long *p, *end;
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unsigned long pagetable = (unsigned long)invalid_pmd_table;
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p = (unsigned long *)addr;
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end = p + PTRS_PER_PUD;
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do {
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p[0] = pagetable;
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p[1] = pagetable;
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p[2] = pagetable;
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p[3] = pagetable;
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p[4] = pagetable;
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p += 8;
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p[-3] = pagetable;
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p[-2] = pagetable;
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p[-1] = pagetable;
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} while (p != end);
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}
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EXPORT_SYMBOL_GPL(pud_init);
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#endif
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pmd_t mk_pmd(struct page *page, pgprot_t prot)
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{
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pmd_t pmd;
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pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
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return pmd;
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}
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void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd)
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{
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*pmdp = pmd;
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flush_tlb_all();
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}
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void __init pagetable_init(void)
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{
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/* Initialize the entire pgd. */
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pgd_init(swapper_pg_dir);
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pgd_init(invalid_pg_dir);
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#ifndef __PAGETABLE_PUD_FOLDED
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pud_init(invalid_pud_table);
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd_init(invalid_pmd_table);
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#endif
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}
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