[08/12] mm, riscv, arm64: Use common ptep_test_and_clear_young() function

Message ID	20240508191931.46060-9-alexghiti@rivosinc.com (mailing list archive)
State	New, archived
Headers	show Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A962B130AF2 for <kvm@vger.kernel.org>; Wed, 8 May 2024 19:27:46 +0000 (UTC) From: Alexandre Ghiti <alexghiti@rivosinc.com> To: Ryan Roberts <ryan.roberts@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>, Dmitry Vyukov <dvyukov@google.com>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Ard Biesheuvel <ardb@kernel.org>, Anup Patel <anup@brainfault.org>, Atish Patra <atishp@atishpatra.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-riscv@lists.infradead.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-mm@kvack.org Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Subject: [PATCH 08/12] mm, riscv, arm64: Use common ptep_test_and_clear_young() function Date: Wed, 8 May 2024 21:19:27 +0200 Message-Id: <20240508191931.46060-9-alexghiti@rivosinc.com> In-Reply-To: <20240508191931.46060-1-alexghiti@rivosinc.com> References: <20240508191931.46060-1-alexghiti@rivosinc.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	Make riscv use THP contpte support for arm64 \| expand [00/12] Make riscv use THP contpte support for arm64 [01/12] mm, arm64: Rename ARM64_CONTPTE to THP_CONTPTE [02/12] mm, riscv, arm64: Use common ptep_get() function [03/12] mm, riscv, arm64: Use common set_ptes() function [04/12] mm, riscv, arm64: Use common ptep_get_lockless() function [05/12] mm, riscv, arm64: Use common set_pte() function [06/12] mm, riscv, arm64: Use common pte_clear() function [07/12] mm, riscv, arm64: Use common ptep_get_and_clear() function [08/12] mm, riscv, arm64: Use common ptep_test_and_clear_young() function [09/12] mm, riscv, arm64: Use common ptep_clear_flush_young() function [10/12] mm, riscv, arm64: Use common ptep_set_access_flags() function [11/12] mm, riscv, arm64: Use common ptep_set_wrprotect()/wrprotect_ptes() functions [12/12] mm, riscv, arm64: Use common get_and_clear_full_ptes()/clear_full_ptes() functions

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index ff7fe1d9cabe..9a8702d1ad00 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1389,8 +1389,6 @@ extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr, extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr, int full); -extern int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep); extern int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); extern void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, @@ -1477,16 +1475,8 @@ extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG -static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) -{ - pte_t orig_pte = __ptep_get(ptep); - - if (likely(!pte_valid_cont(orig_pte))) - return __ptep_test_and_clear_young(vma, addr, ptep); - - return contpte_ptep_test_and_clear_young(vma, addr, ptep); -} +extern int ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH static inline int ptep_clear_flush_young(struct vm_area_struct *vma, diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c index 5e9e40145085..9bf471633ca4 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -45,31 +45,6 @@ pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, } EXPORT_SYMBOL_GPL(contpte_get_and_clear_full_ptes); -int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) -{ - /* - * ptep_clear_flush_young() technically requires us to clear the access - * flag for a _single_ pte. However, the core-mm code actually tracks - * access/dirty per folio, not per page. And since we only create a - * contig range when the range is covered by a single folio, we can get - * away with clearing young for the whole contig range here, so we avoid - * having to unfold. - */ - - int young = 0; - int i; - - ptep = arch_contpte_align_down(ptep); - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); - - for (i = 0; i < CONT_PTES; i++, ptep++, addr += PAGE_SIZE) - young |= __ptep_test_and_clear_young(vma, addr, ptep); - - return young; -} -EXPORT_SYMBOL_GPL(contpte_ptep_test_and_clear_young); - int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 03cd640137ed..d39cb24c6c4a 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -739,8 +739,7 @@ static inline void __pte_clear(struct mm_struct *mm, extern int __ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, pte_t *ptep, pte_t entry, int dirty); -#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG /* defined in mm/pgtable.c */ -extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, +extern int __ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pte_t *ptep); static inline pte_t __ptep_get_and_clear(struct mm_struct *mm, @@ -778,7 +777,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, * shouldn't really matter because there's no real memory * pressure for swapout to react to. ] */ - return ptep_test_and_clear_young(vma, address, ptep); + return __ptep_test_and_clear_young(vma, address, ptep); } #ifdef CONFIG_THP_CONTPTE @@ -797,6 +796,9 @@ extern void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); #define __HAVE_ARCH_PTEP_GET_AND_CLEAR extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); +#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG +extern int ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); #else /* CONFIG_THP_CONTPTE */ @@ -806,6 +808,8 @@ extern pte_t ptep_get_and_clear(struct mm_struct *mm, #define pte_clear __pte_clear #define __HAVE_ARCH_PTEP_GET_AND_CLEAR #define ptep_get_and_clear __ptep_get_and_clear +#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG +#define ptep_test_and_clear_young __ptep_test_and_clear_young #endif /* CONFIG_THP_CONTPTE */ @@ -987,7 +991,7 @@ static inline int pmdp_set_access_flags(struct vm_area_struct *vma, static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { - return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); + return __ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); } #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index 1ee6139d495f..554926e33760 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -585,7 +585,7 @@ bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) &ptep, &ptep_level)) return false; - return ptep_test_and_clear_young(NULL, 0, ptep); + return __ptep_test_and_clear_young(NULL, 0, ptep); } bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) diff --git a/arch/riscv/mm/pgtable.c b/arch/riscv/mm/pgtable.c index 5756bde9eb42..5f31d0594109 100644 --- a/arch/riscv/mm/pgtable.c +++ b/arch/riscv/mm/pgtable.c @@ -18,7 +18,7 @@ int __ptep_set_access_flags(struct vm_area_struct *vma, return true; } -int ptep_test_and_clear_young(struct vm_area_struct *vma, +int __ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) { diff --git a/include/linux/contpte.h b/include/linux/contpte.h index 01da4bfc3af6..38092adbe0d4 100644 --- a/include/linux/contpte.h +++ b/include/linux/contpte.h @@ -19,5 +19,7 @@ void contpte_try_unfold(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte); void contpte_set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, unsigned int nr); +int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep); #endif /* _LINUX_CONTPTE_H */ diff --git a/mm/contpte.c b/mm/contpte.c index 5bf939639233..220e9d81f401 100644 --- a/mm/contpte.c +++ b/mm/contpte.c @@ -47,6 +47,7 @@ * - set_pte() * - pte_clear() * - ptep_get_and_clear() + * - ptep_test_and_clear_young() */ pte_t huge_ptep_get(pte_t *ptep) @@ -690,4 +691,42 @@ pte_t ptep_get_and_clear(struct mm_struct *mm, contpte_try_unfold(mm, addr, ptep, __ptep_get(ptep)); return __ptep_get_and_clear(mm, addr, ptep); } + +int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + /* + * ptep_clear_flush_young() technically requires us to clear the access + * flag for a _single_ pte. However, the core-mm code actually tracks + * access/dirty per folio, not per page. And since we only create a + * contig range when the range is covered by a single folio, we can get + * away with clearing young for the whole contig range here, so we avoid + * having to unfold. + */ + + size_t pgsize; + int young = 0; + int i, ncontig; + + ptep = arch_contpte_align_down(ptep); + ncontig = arch_contpte_get_num_contig(vma->vm_mm, addr, ptep, 0, &pgsize); + addr = ALIGN_DOWN(addr, ncontig * pgsize); + + for (i = 0; i < ncontig; i++, ptep++, addr += pgsize) + young |= __ptep_test_and_clear_young(vma, addr, ptep); + + return young; +} +EXPORT_SYMBOL_GPL(contpte_ptep_test_and_clear_young); + +__always_inline int ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + pte_t orig_pte = __ptep_get(ptep); + + if (likely(!pte_valid_cont(orig_pte))) + return __ptep_test_and_clear_young(vma, addr, ptep); + + return contpte_ptep_test_and_clear_young(vma, addr, ptep); +} #endif /* CONFIG_THP_CONTPTE */

[08/12] mm, riscv, arm64: Use common ptep_test_and_clear_young() function

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