[v3,3/9] mm: Use common huge_ptep_get() function for riscv/arm64

Message ID	20240802151430.99114-4-alexghiti@rivosinc.com (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> From: Alexandre Ghiti <alexghiti@rivosinc.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Ryan Roberts <ryan.roberts@arm.com>, Mark Rutland <mark.rutland@arm.com>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-mm@kvack.org Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Subject: [PATCH v3 3/9] mm: Use common huge_ptep_get() function for riscv/arm64 Date: Fri, 2 Aug 2024 17:14:24 +0200 Message-Id: <20240802151430.99114-4-alexghiti@rivosinc.com> In-Reply-To: <20240802151430.99114-1-alexghiti@rivosinc.com> References: <20240802151430.99114-1-alexghiti@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	Merge arm64/riscv hugetlbfs contpte support \| expand [v3,0/9] Merge arm64/riscv hugetlbfs contpte support [v3,1/9] riscv: Safely remove huge_pte_offset() when manipulating NAPOT ptes [v3,2/9] riscv: Restore the pfn in a NAPOT pte when manipulated by core mm code [v3,3/9] mm: Use common huge_ptep_get() function for riscv/arm64 [v3,4/9] mm: Use common set_huge_pte_at() function for riscv/arm64 [v3,5/9] mm: Use common huge_pte_clear() function for riscv/arm64 [v3,6/9] mm: Use common huge_ptep_get_and_clear() function for riscv/arm64 [v3,7/9] mm: Use common huge_ptep_set_access_flags() function for riscv/arm64 [v3,8/9] mm: Use common huge_ptep_set_wrprotect() function for riscv/arm64 [v3,9/9] mm: Use common huge_ptep_clear_flush() function for riscv/arm64

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b3fc891f1544..0a524959804a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -104,6 +104,7 @@ config ARM64 select ARCH_WANT_DEFAULT_BPF_JIT select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT select ARCH_WANT_FRAME_POINTERS + select ARCH_WANT_GENERAL_HUGETLB_CONTPTE select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36) select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANTS_EXECMEM_LATE if EXECMEM diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h index 293f880865e8..80d25b4eff25 100644 --- a/arch/arm64/include/asm/hugetlb.h +++ b/arch/arm64/include/asm/hugetlb.h @@ -12,6 +12,7 @@ #include <asm/cacheflush.h> #include <asm/page.h> +#include <linux/hugetlb_contpte.h> #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION #define arch_hugetlb_migration_supported arch_hugetlb_migration_supported @@ -45,8 +46,6 @@ extern pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, #define __HAVE_ARCH_HUGE_PTE_CLEAR extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned long sz); -#define __HAVE_ARCH_HUGE_PTEP_GET -extern pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep); void __init arm64_hugetlb_cma_reserve(void); diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 7a4f5604be3f..2a6a01b447df 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -397,9 +397,10 @@ static inline pte_t pte_advance_pfn(pte_t pte, unsigned long nr) return pfn_pte(pte_pfn(pte) + nr, pte_pgprot(pte)); } -static inline void __set_ptes(struct mm_struct *mm, - unsigned long __always_unused addr, - pte_t *ptep, pte_t pte, unsigned int nr) +static inline void ___set_ptes(struct mm_struct *mm, + unsigned long __always_unused addr, + pte_t *ptep, pte_t pte, unsigned int nr, + size_t pgsize) { page_table_check_ptes_set(mm, ptep, pte, nr); __sync_cache_and_tags(pte, nr); @@ -410,10 +411,15 @@ static inline void __set_ptes(struct mm_struct *mm, if (--nr == 0) break; ptep++; - pte = pte_advance_pfn(pte, 1); + pte = pte_advance_pfn(pte, pgsize >> PAGE_SHIFT); } } +#define __set_ptes(mm, addr, ptep, pte, nr) \ + ___set_ptes(mm, addr, ptep, pte, nr, PAGE_SIZE) + +#define set_contptes ___set_ptes + /* * Huge pte definitions. */ @@ -1760,6 +1766,40 @@ static inline void clear_young_dirty_ptes(struct vm_area_struct *vma, #endif /* CONFIG_ARM64_CONTPTE */ +static inline int arch_contpte_get_num_contig(pte_t *ptep, + unsigned long size, + size_t *pgsize) +{ + int contig_ptes = 0; + + if (pgsize) + *pgsize = size; + + switch (size) { +#ifndef __PAGETABLE_PMD_FOLDED + case PUD_SIZE: + if (pud_sect_supported()) + contig_ptes = 1; + break; +#endif + case PMD_SIZE: + contig_ptes = 1; + break; + case CONT_PMD_SIZE: + if (pgsize) + *pgsize = PMD_SIZE; + contig_ptes = CONT_PMDS; + break; + case CONT_PTE_SIZE: + if (pgsize) + *pgsize = PAGE_SIZE; + contig_ptes = CONT_PTES; + break; + } + + return contig_ptes; +} + #endif /* !__ASSEMBLY__ */ #endif /* __ASM_PGTABLE_H */ diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index 5f1e2103888b..58cb5e06dcb2 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -98,57 +98,6 @@ static int find_num_contig(struct mm_struct *mm, unsigned long addr, return CONT_PTES; } -static inline int num_contig_ptes(unsigned long size, size_t *pgsize) -{ - int contig_ptes = 0; - - *pgsize = size; - - switch (size) { -#ifndef __PAGETABLE_PMD_FOLDED - case PUD_SIZE: - if (pud_sect_supported()) - contig_ptes = 1; - break; -#endif - case PMD_SIZE: - contig_ptes = 1; - break; - case CONT_PMD_SIZE: - *pgsize = PMD_SIZE; - contig_ptes = CONT_PMDS; - break; - case CONT_PTE_SIZE: - *pgsize = PAGE_SIZE; - contig_ptes = CONT_PTES; - break; - } - - return contig_ptes; -} - -pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep) -{ - int ncontig, i; - size_t pgsize; - pte_t orig_pte = __ptep_get(ptep); - - if (!pte_present(orig_pte) || !pte_cont(orig_pte)) - return orig_pte; - - ncontig = num_contig_ptes(page_size(pte_page(orig_pte)), &pgsize); - for (i = 0; i < ncontig; i++, ptep++) { - pte_t pte = __ptep_get(ptep); - - if (pte_dirty(pte)) - orig_pte = pte_mkdirty(orig_pte); - - if (pte_young(pte)) - orig_pte = pte_mkyoung(orig_pte); - } - return orig_pte; -} - /* * Changing some bits of contiguous entries requires us to follow a * Break-Before-Make approach, breaking the whole contiguous set @@ -229,7 +178,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, unsigned long pfn, dpfn; pgprot_t hugeprot; - ncontig = num_contig_ptes(sz, &pgsize); + ncontig = arch_contpte_get_num_contig(ptep, sz, &pgsize); if (!pte_present(pte)) { for (i = 0; i < ncontig; i++, ptep++, addr += pgsize) @@ -379,7 +328,7 @@ void huge_pte_clear(struct mm_struct *mm, unsigned long addr, int i, ncontig; size_t pgsize; - ncontig = num_contig_ptes(sz, &pgsize); + ncontig = arch_contpte_get_num_contig(ptep, sz, &pgsize); for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) __pte_clear(mm, addr, ptep); diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e860f3e8c702..5f6ed3a43aa7 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -73,6 +73,7 @@ config RISCV select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT + select ARCH_WANT_GENERAL_HUGETLB_CONTPTE if RISCV_ISA_SVNAPOT select ARCH_WANT_HUGE_PMD_SHARE if 64BIT select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h index faf3624d8057..d9f9bfb84908 100644 --- a/arch/riscv/include/asm/hugetlb.h +++ b/arch/riscv/include/asm/hugetlb.h @@ -4,6 +4,9 @@ #include <asm/cacheflush.h> #include <asm/page.h> +#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB_CONTPTE +#include <linux/hugetlb_contpte.h> +#endif static inline void arch_clear_hugetlb_flags(struct folio *folio) { @@ -43,9 +46,6 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t pte, int dirty); -#define __HAVE_ARCH_HUGE_PTEP_GET -pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep); - pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags); #define arch_make_huge_pte arch_make_huge_pte diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 34c4c360d4ce..412ccebcdee9 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -300,6 +300,8 @@ static inline unsigned long pte_napot(pte_t pte) return pte_val(pte) & _PAGE_NAPOT; } +#define pte_cont pte_napot + #define pte_valid_napot(pte) (pte_present(pte) && pte_napot(pte)) static inline pte_t pte_mknapot(pte_t pte, unsigned int order) @@ -581,6 +583,38 @@ static inline void __set_ptes(struct mm_struct *mm, unsigned long addr, } } +#ifdef CONFIG_RISCV_ISA_SVNAPOT +static inline int arch_contpte_get_num_contig(pte_t *ptep, unsigned long size, + size_t *pgsize) +{ + unsigned long hugepage_shift; + pte_t __pte; + + if (size >= PGDIR_SIZE) + hugepage_shift = PGDIR_SHIFT; + else if (size >= P4D_SIZE) + hugepage_shift = P4D_SHIFT; + else if (size >= PUD_SIZE) + hugepage_shift = PUD_SHIFT; + else if (size >= PMD_SIZE) + hugepage_shift = PMD_SHIFT; + else + hugepage_shift = PAGE_SHIFT; + + if (pgsize) + *pgsize = BIT(hugepage_shift); + + /* We must read the raw value of the pte to get the size of the mapping */ + __pte = __ptep_get(ptep); + + /* Make sure __pte is not a swap entry */ + if (pte_valid_napot(__pte)) + return napot_pte_num(napot_cont_order(__pte)); + + return size >> hugepage_shift; +} +#endif + static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { @@ -665,6 +699,8 @@ static inline void set_ptes(struct mm_struct *mm, unsigned long addr, __set_ptes(mm, addr, ptep, pteval, nr); } #define set_ptes set_ptes +#define set_contptes(mm, addr, ptep, pte, nr, pgsize) \ + set_ptes(mm, addr, ptep, pte, nr) static inline pte_t ptep_get(pte_t *ptep) { diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index 59ed26ce6857..d51863824540 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -3,30 +3,6 @@ #include <linux/err.h> #ifdef CONFIG_RISCV_ISA_SVNAPOT -pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep) -{ - unsigned long pte_num; - int i; - pte_t orig_pte = ptep_get(ptep); - - if (!pte_present(orig_pte) || !pte_napot(orig_pte)) - return orig_pte; - - pte_num = napot_pte_num(napot_cont_order(orig_pte)); - - for (i = 0; i < pte_num; i++, ptep++) { - pte_t pte = ptep_get(ptep); - - if (pte_dirty(pte)) - orig_pte = pte_mkdirty(orig_pte); - - if (pte_young(pte)) - orig_pte = pte_mkyoung(orig_pte); - } - - return orig_pte; -} - pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, @@ -266,15 +242,13 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma, int dirty) { struct mm_struct *mm = vma->vm_mm; - unsigned long order; pte_t orig_pte; - int i, pte_num; + int pte_num; if (!pte_napot(pte)) return ptep_set_access_flags(vma, addr, ptep, pte, dirty); - order = napot_cont_order(pte); - pte_num = napot_pte_num(order); + pte_num = arch_contpte_get_num_contig(ptep, 0, NULL); orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num); if (pte_dirty(orig_pte)) @@ -298,7 +272,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, if (!pte_napot(orig_pte)) return ptep_get_and_clear(mm, addr, ptep); - pte_num = napot_pte_num(napot_cont_order(orig_pte)); + pte_num = arch_contpte_get_num_contig(ptep, 0, NULL); return get_clear_contig(mm, addr, ptep, pte_num); } @@ -308,17 +282,15 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm, pte_t *ptep) { pte_t pte = ptep_get(ptep); - unsigned long order; pte_t orig_pte; - int i, pte_num; + int pte_num; if (!pte_napot(pte)) { ptep_set_wrprotect(mm, addr, ptep); return; } - order = napot_cont_order(pte); - pte_num = napot_pte_num(order); + pte_num = arch_contpte_get_num_contig(ptep, 0, NULL); orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num); orig_pte = pte_wrprotect(orig_pte); @@ -336,7 +308,7 @@ pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, if (!pte_napot(pte)) return ptep_clear_flush(vma, addr, ptep); - pte_num = napot_pte_num(napot_cont_order(pte)); + pte_num = arch_contpte_get_num_contig(ptep, 0, NULL); return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num); } @@ -346,6 +318,7 @@ void huge_pte_clear(struct mm_struct *mm, pte_t *ptep, unsigned long sz) { + size_t pgsize; pte_t pte = ptep_get(ptep); int i, pte_num; @@ -354,8 +327,8 @@ void huge_pte_clear(struct mm_struct *mm, return; } - pte_num = napot_pte_num(napot_cont_order(pte)); - for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) + pte_num = arch_contpte_get_num_contig(ptep, sz, &pgsize); + for (i = 0; i < pte_num; i++, addr += pgsize, ptep++) pte_clear(mm, addr, ptep); } diff --git a/include/linux/hugetlb_contpte.h b/include/linux/hugetlb_contpte.h new file mode 100644 index 000000000000..ec4189cd65b8 --- /dev/null +++ b/include/linux/hugetlb_contpte.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2024 Rivos Inc. + */ + +#ifndef _LINUX_HUGETLB_CONTPTE_H +#define _LINUX_HUGETLB_CONTPTE_H + +#define __HAVE_ARCH_HUGE_PTEP_GET +extern pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep); + +#endif /* _LINUX_HUGETLB_CONTPTE_H */ diff --git a/mm/Kconfig b/mm/Kconfig index b72e7d040f78..0bba50d0639a 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -798,6 +798,9 @@ config NOMMU_INITIAL_TRIM_EXCESS config ARCH_WANT_GENERAL_HUGETLB bool +config ARCH_WANT_GENERAL_HUGETLB_CONTPTE + bool + config ARCH_WANTS_THP_SWAP def_bool n diff --git a/mm/Makefile b/mm/Makefile index d2915f8c9dc0..3dd91c4466aa 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -95,6 +95,7 @@ obj-$(CONFIG_MIGRATION) += migrate.o obj-$(CONFIG_NUMA) += memory-tiers.o obj-$(CONFIG_DEVICE_MIGRATION) += migrate_device.o obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o khugepaged.o +obj-$(CONFIG_ARCH_WANT_GENERAL_HUGETLB_CONTPTE) += hugetlb_contpte.o obj-$(CONFIG_PAGE_COUNTER) += page_counter.o obj-$(CONFIG_MEMCG_V1) += memcontrol-v1.o obj-$(CONFIG_MEMCG) += memcontrol.o vmpressure.o diff --git a/mm/hugetlb_contpte.c b/mm/hugetlb_contpte.c new file mode 100644 index 000000000000..0e3ba6f97c58 --- /dev/null +++ b/mm/hugetlb_contpte.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2024 Rivos Inc. + */ + +#include <linux/pgtable.h> +#include <linux/mm.h> +#include <linux/hugetlb.h> + +/* + * Any arch that wants to use that needs to define: + * - __ptep_get() + * - pte_cont() + * - arch_contpte_get_num_contig() + */ + +/* + * This file implements the following contpte aware API: + * - huge_ptep_get() + */ + +pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ + int ncontig, i; + pte_t orig_pte = __ptep_get(ptep); + + if (!pte_present(orig_pte) || !pte_cont(orig_pte)) + return orig_pte; + + ncontig = arch_contpte_get_num_contig(ptep, + page_size(pte_page(orig_pte)), + NULL); + + for (i = 0; i < ncontig; i++, ptep++) { + pte_t pte = __ptep_get(ptep); + + if (pte_dirty(pte)) + orig_pte = pte_mkdirty(orig_pte); + + if (pte_young(pte)) + orig_pte = pte_mkyoung(orig_pte); + } + return orig_pte; +}

[v3,3/9] mm: Use common huge_ptep_get() function for riscv/arm64

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