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bh=hDGtd2tgXIan13dy2PEKZ68DXcw4gSjf8pK8pQRP1gI=; b=RWFL4d7xTcNVQnXbaM1WYUb1S8Plz3HF6NtHedw076tQMiysJ8NVdiMQ Ipm2woSe8e2mF08wdMw1IcQi72XwnZikmyw7n0jmj3jNhoAcRE2LUygDF +oSAe0LnOx+C1zDZDhO3JGwLOrIOQXZhPyWUBnDENBh8mEzf2jv4Nd7mf uZH4UGXisTklyXHp4MoZdi9k30lnWJPMO0YZYy65opP13ppXsHuaMa+O7 MsEM5K/UfHtZkoZeA1NMCqmJc2Ow7skEpRDnK0yOnO2QCXfMVXugjfJtR jSJ/9tlIp1519UBvw/Fuk+1r8dQ3/vuFXVmO7WCeF+A3pugq9+5ra8wZH A==; X-IronPort-AV: E=McAfee;i="6600,9927,10784"; a="454888120" X-IronPort-AV: E=Sophos;i="6.01,236,1684825200"; d="scan'208";a="454888120" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jul 2023 00:11:12 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10784"; a="721161998" X-IronPort-AV: E=Sophos;i="6.01,236,1684825200"; d="scan'208";a="721161998" Received: from fyin-dev.sh.intel.com ([10.239.159.32]) by orsmga007.jf.intel.com with ESMTP; 28 Jul 2023 00:11:08 -0700 From: Yin Fengwei To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, yuzhao@google.com, willy@infradead.org, david@redhat.com, ryan.roberts@arm.com, shy828301@gmail.com, hughd@google.com Cc: fengwei.yin@intel.com Subject: [PATCH 1/3] mm: add functions folio_in_range() and folio_within_vma() Date: Fri, 28 Jul 2023 15:09:27 +0800 Message-Id: <20230728070929.2487065-2-fengwei.yin@intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230728070929.2487065-1-fengwei.yin@intel.com> References: <20230728070929.2487065-1-fengwei.yin@intel.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: EC411140006 X-Stat-Signature: m4f516f6s5k6fmwirxesjdkhqcdjsb7i X-HE-Tag: 1690528274-8556 X-HE-Meta: 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 j5V9HI0s gmdKNjdhYQ8KCTQdrVt3cOWWnWqWER2ZVQIcWFlERVAJQEFSLPEJ3p2jjRQfdFw+cd5k90CahfjPKf2Ltt08uMUMR55DaG10DUMF9YQX/o84T5TyWwswMAoqiRslP/hNHjniycaRbWtGEAGI/S3DIVX8MB4nDLdhPAmTML8HPRHMIj8oSsmFqrmLLRQBNDw+2X+/NhUsbeT2xChUjQvLVXqSiZMoGKH/0kwfedEusxrxdUuHw3gwKwkNNlQ== 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: It will be used to check whether the folio is mapped to specific VMA and whether the mapping address of folio is in the range. Also a helper function folio_within_vma() to check whether folio is in the range of vma based on folio_in_range(). Signed-off-by: Yin Fengwei --- mm/internal.h | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/mm/internal.h b/mm/internal.h index 5a03bc4782a2..63de32154a48 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -585,6 +585,75 @@ extern long faultin_vma_page_range(struct vm_area_struct *vma, bool write, int *locked); extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags, unsigned long bytes); + +/* + * Check whether the folio is in specific range + * + * First, check whether the folio is in the range of vma. + * Then, check whether the folio is mapped to the range of [start, end]. + * In the end, check whether the folio is fully mapped to the range. + * + * @pte page table pointer will be checked whether the large folio + * is fully mapped to. Currently, if mremap in the middle of + * large folio, the large folio could be mapped to to different + * VMA and address check can't identify this situation. + */ +static inline bool +folio_in_range(struct folio *folio, struct vm_area_struct *vma, + unsigned long start, unsigned long end, pte_t *pte) +{ + pte_t ptent; + unsigned long i, nr = folio_nr_pages(folio); + pgoff_t pgoff, addr; + unsigned long vma_pglen = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; + + VM_WARN_ON_FOLIO(folio_test_ksm(folio), folio); + + if (start < vma->vm_start) + start = vma->vm_start; + if (end > vma->vm_end) + end = vma->vm_end; + + pgoff = folio_pgoff(folio); + /* if folio start address is not in vma range */ + if (pgoff < vma->vm_pgoff || pgoff > vma->vm_pgoff + vma_pglen) + return false; + + addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); + if (addr < start || end - addr < folio_size(folio)) + return false; + + /* not necessary to check pte for none large folio */ + if (!folio_test_large(folio)) + return true; + + if (!pte) + return false; + + /* check whether parameter pte is associated with folio */ + ptent = ptep_get(pte); + if (pte_none(ptent) || !pte_present(ptent) || + pte_pfn(ptent) - folio_pfn(folio) >= nr) + return false; + + pte -= pte_pfn(ptent) - folio_pfn(folio); + for (i = 0; i < nr; i++, pte++) { + ptent = ptep_get(pte); + + if (pte_none(ptent) || !pte_present(ptent) || + pte_pfn(ptent) - folio_pfn(folio) >= nr) + return false; + } + + return true; +} + +static inline bool +folio_within_vma(struct folio *folio, struct vm_area_struct *vma, pte_t *pte) +{ + return folio_in_range(folio, vma, vma->vm_start, vma->vm_end, pte); +} + /* * mlock_vma_folio() and munlock_vma_folio(): * should be called with vma's mmap_lock held for read or write,