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Tue, 4 Mar 2025 07:05:01 -0800 (PST) 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 v3 04/11] arm64/mm: Refactor __set_ptes() and __ptep_get_and_clear() Date: Tue, 4 Mar 2025 15:04:34 +0000 Message-ID: <20250304150444.3788920-5-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250304150444.3788920-1-ryan.roberts@arm.com> References: <20250304150444.3788920-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 424224002C X-Rspamd-Server: rspam09 X-Stat-Signature: jf9fhmusqsyb7iy919nwpki78bz9hm6s X-HE-Tag: 1741100704-787520 X-HE-Meta: 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 RRpL9pyi 2bzMlAb0Vqqw39NOzc1vbq6P7nflwURsPsoUEUIvRVcQ6Rqd8t9T5DNL6TA73qoAVld3MlmVGIueMDca6yP7UCuruIJXaf5/rRd3Ah16r53UKexVKBAqExzE6/5bCwOi0dE3pdXfdcCRfpLAV6ub4rAss/if0c3Y9YhT1PAuDDcOR1rGTg765MeF6tD9APlvREZKMuiux937HAwU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. Signed-off-by: Ryan Roberts --- arch/arm64/include/asm/pgtable.h | 108 +++++++++++++++++++------------ 1 file changed, 67 insertions(+), 41 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 0b2a2ad1b9e8..e255a36380dc 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -420,23 +420,6 @@ 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) -{ - 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 == 0) - break; - ptep++; - pte = pte_advance_pfn(pte, 1); - } -} - /* * Hugetlb definitions. */ @@ -641,30 +624,59 @@ static inline pgprot_t pud_pgprot(pud_t pud) return __pgprot(pud_val(pfn_pud(pfn, __pgprot(0))) ^ pud_val(pud)); } -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 = 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; + case PUD_SIZE: + page_table_check_puds_set(mm, (pud_t *)ptep, pte_pud(pte), nr); + break; + 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 == 0) + break; + ptep++; + pte = pte_advance_pfn(pte, stride); + } } -static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, - pmd_t *pmdp, pmd_t pmd) +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_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, ptep, pte, nr, PAGE_SIZE); } -static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, - pud_t *pudp, pud_t pud) +static inline void __set_pmds(struct mm_struct *mm, + unsigned long __always_unused addr, + pmd_t *pmdp, pmd_t pmd, unsigned int nr) +{ + 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) + +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) #define __p4d_to_phys(p4d) __pte_to_phys(p4d_pte(p4d)) #define __phys_to_p4d_val(phys) __phys_to_pte_val(phys) @@ -1276,16 +1288,34 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, } #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG */ -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 = __pte(xchg_relaxed(&pte_val(*ptep), 0)); - 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; + case PUD_SIZE: + page_table_check_pud_clear(mm, pte_pud(pte)); + break; + default: + VM_WARN_ON(1); + } return pte; } +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 addr, pte_t *ptep, unsigned int nr, int full) { @@ -1322,11 +1352,7 @@ 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 = __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 */