From nobody Fri Dec 19 15:19:34 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 59481254AF5 for ; Tue, 22 Apr 2025 08:18:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745309931; cv=none; b=gq4aKT4JJsn2tmEJAJAwX3EgO93gxdmGYKgVb/f4L6Xe0kgdBJ/O+Tez1kUbmPJjXq2YjlWI8eaM+U0/aUfUC8811Q6yvs3mtcJw7WvFmK6J9K8Pn3dvprFk7wwWOp3xriVT2E+jTZnSqvqD18MiDZf0PccGvUR2rUPvAjTD/fo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745309931; c=relaxed/simple; bh=/4ELG4ZleY5UZH+tsAHy8HCFxbH6cFjWzaGYUoFe4Rg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M28pT15euq2xqTMGM0BIO4URiC6WncAD+NtRpzMg902IJ6hLy2fRW5EDxbROzj+kditdTQMofaToWgDaYuWFFe90yUvQFIW1q0sqpqdWovbO0m5loVy2aAmqbD7EJH10Pxvpj+vjdkzUU8cPbwFuQAFbIp6wb3sfYSnvJLdSHus= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 64F7A152B; Tue, 22 Apr 2025 01:18:45 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B1F893F66E; Tue, 22 Apr 2025 01:18:47 -0700 (PDT) From: Ryan Roberts To: Catalin Marinas , Will Deacon , Pasha Tatashin , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , David Hildenbrand , "Matthew Wilcox (Oracle)" , Mark Rutland , Anshuman Khandual , Alexandre Ghiti , Kevin Brodsky Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 04/11] arm64/mm: Refactor __set_ptes() and __ptep_get_and_clear() Date: Tue, 22 Apr 2025 09:18:12 +0100 Message-ID: <20250422081822.1836315-5-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250422081822.1836315-1-ryan.roberts@arm.com> References: <20250422081822.1836315-1-ryan.roberts@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Refactor __set_ptes(), set_pmd_at() and set_pud_at() so that they are all a thin wrapper around a new common __set_ptes_anysz(), which takes pgsize parameter. Additionally, refactor __ptep_get_and_clear() and pmdp_huge_get_and_clear() to use a new common __ptep_get_and_clear_anysz() which also takes a pgsize parameter. These changes will permit the huge_pte API to efficiently batch-set pgtable entries and take advantage of the future barrier optimizations. Additionally since the new *_anysz() helpers call the correct page_table_check_*_set() API based on pgsize, this means that huge_ptes will be able to get proper coverage. Currently the huge_pte API always uses the pte API which assumes an entry only covers a single page. Reviewed-by: Catalin Marinas Signed-off-by: Ryan Roberts Reviewed-by: Anshuman Khandual --- arch/arm64/include/asm/pgtable.h | 114 ++++++++++++++++++++----------- 1 file changed, 73 insertions(+), 41 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgta= ble.h index d3b538be1500..d80aa9ba0a16 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -423,23 +423,6 @@ static inline pte_t pte_advance_pfn(pte_t pte, unsigne= d long nr) return pfn_pte(pte_pfn(pte) + nr, pte_pgprot(pte)); } =20 -static inline void __set_ptes(struct mm_struct *mm, - unsigned long __always_unused addr, - pte_t *ptep, pte_t pte, unsigned int nr) -{ - page_table_check_ptes_set(mm, ptep, pte, nr); - __sync_cache_and_tags(pte, nr); - - for (;;) { - __check_safe_pte_update(mm, ptep, pte); - __set_pte(ptep, pte); - if (--nr =3D=3D 0) - break; - ptep++; - pte =3D pte_advance_pfn(pte, 1); - } -} - /* * Hugetlb definitions. */ @@ -649,30 +632,62 @@ static inline pgprot_t pud_pgprot(pud_t pud) return __pgprot(pud_val(pfn_pud(pfn, __pgprot(0))) ^ pud_val(pud)); } =20 -static inline void __set_pte_at(struct mm_struct *mm, - unsigned long __always_unused addr, - pte_t *ptep, pte_t pte, unsigned int nr) +static inline void __set_ptes_anysz(struct mm_struct *mm, pte_t *ptep, + pte_t pte, unsigned int nr, + unsigned long pgsize) { - __sync_cache_and_tags(pte, nr); - __check_safe_pte_update(mm, ptep, pte); - __set_pte(ptep, pte); + unsigned long stride =3D pgsize >> PAGE_SHIFT; + + switch (pgsize) { + case PAGE_SIZE: + page_table_check_ptes_set(mm, ptep, pte, nr); + break; + case PMD_SIZE: + page_table_check_pmds_set(mm, (pmd_t *)ptep, pte_pmd(pte), nr); + break; +#ifndef __PAGETABLE_PMD_FOLDED + case PUD_SIZE: + page_table_check_puds_set(mm, (pud_t *)ptep, pte_pud(pte), nr); + break; +#endif + default: + VM_WARN_ON(1); + } + + __sync_cache_and_tags(pte, nr * stride); + + for (;;) { + __check_safe_pte_update(mm, ptep, pte); + __set_pte(ptep, pte); + if (--nr =3D=3D 0) + break; + ptep++; + pte =3D pte_advance_pfn(pte, stride); + } +} + +static inline void __set_ptes(struct mm_struct *mm, + unsigned long __always_unused addr, + pte_t *ptep, pte_t pte, unsigned int nr) +{ + __set_ptes_anysz(mm, ptep, pte, nr, PAGE_SIZE); } =20 -static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, - pmd_t *pmdp, pmd_t pmd) +static inline void __set_pmds(struct mm_struct *mm, + unsigned long __always_unused addr, + pmd_t *pmdp, pmd_t pmd, unsigned int nr) { - page_table_check_pmd_set(mm, pmdp, pmd); - return __set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd), - PMD_SIZE >> PAGE_SHIFT); + __set_ptes_anysz(mm, (pte_t *)pmdp, pmd_pte(pmd), nr, PMD_SIZE); } +#define set_pmd_at(mm, addr, pmdp, pmd) __set_pmds(mm, addr, pmdp, pmd, 1) =20 -static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, - pud_t *pudp, pud_t pud) +static inline void __set_puds(struct mm_struct *mm, + unsigned long __always_unused addr, + pud_t *pudp, pud_t pud, unsigned int nr) { - page_table_check_pud_set(mm, pudp, pud); - return __set_pte_at(mm, addr, (pte_t *)pudp, pud_pte(pud), - PUD_SIZE >> PAGE_SHIFT); + __set_ptes_anysz(mm, (pte_t *)pudp, pud_pte(pud), nr, PUD_SIZE); } +#define set_pud_at(mm, addr, pudp, pud) __set_puds(mm, addr, pudp, pud, 1) =20 #define __p4d_to_phys(p4d) __pte_to_phys(p4d_pte(p4d)) #define __phys_to_p4d_val(phys) __phys_to_pte_val(phys) @@ -1301,16 +1316,37 @@ static inline int pmdp_test_and_clear_young(struct = vm_area_struct *vma, } #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG= */ =20 -static inline pte_t __ptep_get_and_clear(struct mm_struct *mm, - unsigned long address, pte_t *ptep) +static inline pte_t __ptep_get_and_clear_anysz(struct mm_struct *mm, + pte_t *ptep, + unsigned long pgsize) { pte_t pte =3D __pte(xchg_relaxed(&pte_val(*ptep), 0)); =20 - page_table_check_pte_clear(mm, pte); + switch (pgsize) { + case PAGE_SIZE: + page_table_check_pte_clear(mm, pte); + break; + case PMD_SIZE: + page_table_check_pmd_clear(mm, pte_pmd(pte)); + break; +#ifndef __PAGETABLE_PMD_FOLDED + case PUD_SIZE: + page_table_check_pud_clear(mm, pte_pud(pte)); + break; +#endif + default: + VM_WARN_ON(1); + } =20 return pte; } =20 +static inline pte_t __ptep_get_and_clear(struct mm_struct *mm, + unsigned long address, pte_t *ptep) +{ + return __ptep_get_and_clear_anysz(mm, ptep, PAGE_SIZE); +} + static inline void __clear_full_ptes(struct mm_struct *mm, unsigned long a= ddr, pte_t *ptep, unsigned int nr, int full) { @@ -1347,11 +1383,7 @@ static inline pte_t __get_and_clear_full_ptes(struct= mm_struct *mm, static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long address, pmd_t *pmdp) { - pmd_t pmd =3D __pmd(xchg_relaxed(&pmd_val(*pmdp), 0)); - - page_table_check_pmd_clear(mm, pmd); - - return pmd; + return pte_pmd(__ptep_get_and_clear_anysz(mm, (pte_t *)pmdp, PMD_SIZE)); } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ =20 --=20 2.43.0