From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/yYkmginlixGiz+qtIsIYnWaHtTgeAc9xkpLpY2YKDTveRPMe6p4UnaNlo44dTDKYBynZW ARC-Seal: i=1; a=rsa-sha256; t=1522234766; cv=none; d=google.com; s=arc-20160816; b=BrB8PStkbjvLuRkVXaXF9ZZaQ4Vmf0Xa4HnoqfdtZi9keAdegg7VU//uQKAgK++T01 MYXDTnkhyKzYbcU4PcLn2u6kF5yaDKNFmUrCZ81fb2rlXZZ0SSlJo4YvcvhVQlJX/tLt Nyr5V5gZGK76x/6r200od7yQhUjN+XaqGr/N45vR+AnK8FRKfm4R0AbkXxWZW1j3gBOO WsZGqP9blILHFuG9pP5C4OnFs0et4dvJ+qyjpKej+YQrUbAsA4YnCVjCfG/osNPSDLRy bLLAdDDpoQIz2X9y4h9iuBzG4l1g1ZGHVAUhqj/xoJqA1FkSrC2CsPgU/wNVliTbreIr oeow== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dmarc-filter:dkim-signature:dkim-signature :arc-authentication-results; bh=6bXvrwMrY4JUNp6ezaE8Flo4AeexCN8PMelvK4vasmc=; b=RILVidcEguy6wW1htSVtk/9Au9c2PsceEwUFhU71+wRxegKnemJMl4I9cxTlAEnxjs HVc0Fpw7E7DlJIAUfUXw7GdiGkIzM11kBa5c/R+O1AqoK2b/x9axYef0oh9IZ2nhfc0N q7EAaWWwKawdP/D4BoocQOjy9qIGnPT4iG6zia8ZuAzBZoWHwU/FTNyFgiblHTlXrJJq 5yTleupo8Mm77hj1CwkTRAFB7CBoNr7g9li/+0btiX9OaQvqHlK6rUnGPdJibKmOcof+ rWSAx6z4vv6jfqMaexVmiLYvUTbEctm0tPionUBqSwqVtkvYf566CTTPHKI/i51zgk85 IYGw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=YxUgdFPI; dkim=pass header.i=@codeaurora.org header.s=default header.b=B1HjLSgH; spf=pass (google.com: domain of cpandya@codeaurora.org designates 198.145.29.96 as permitted sender) smtp.mailfrom=cpandya@codeaurora.org Authentication-Results: mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=YxUgdFPI; dkim=pass header.i=@codeaurora.org header.s=default header.b=B1HjLSgH; spf=pass (google.com: domain of cpandya@codeaurora.org designates 198.145.29.96 as permitted sender) smtp.mailfrom=cpandya@codeaurora.org DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 6BF1760F6E Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cpandya@codeaurora.org From: Chintan Pandya To: catalin.marinas@arm.com, will.deacon@arm.com, mark.rutland@arm.com, toshi.kani@hpe.com Cc: arnd@arndb.de, ard.biesheuvel@linaro.org, marc.zyngier@arm.com, james.morse@arm.com, kristina.martsenko@arm.com, takahiro.akashi@linaro.org, gregkh@linuxfoundation.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, akpm@linux-foundation.org, Chintan Pandya Subject: [PATCH v6 1/2] arm64: Implement page table free interfaces Date: Wed, 28 Mar 2018 16:28:50 +0530 Message-Id: <1522234731-27397-4-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1522234731-27397-1-git-send-email-cpandya@codeaurora.org> References: <1522234731-27397-1-git-send-email-cpandya@codeaurora.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595007777008930452?= X-GMAIL-MSGID: =?utf-8?q?1596178842506096019?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Implement pud_free_pmd_page() and pmd_free_pte_page(). Implementation requires, 1) Clearing off the current pud/pmd entry 2) Invalidate TLB which could have previously valid but not stale entry 3) Freeing of the un-used next level page tables Signed-off-by: Chintan Pandya --- >>From V5->V6: - Removed extra bool parameter 'tlb_inv' - Doing pmd/pud TLB invalidation with __flush_tlb_kernel_pgtable() arch/arm64/mm/mmu.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index da98828..0f651db 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -45,6 +45,7 @@ #include #include #include +#include #define NO_BLOCK_MAPPINGS BIT(0) #define NO_CONT_MAPPINGS BIT(1) @@ -973,12 +974,32 @@ int pmd_clear_huge(pmd_t *pmdp) return 1; } -int pud_free_pmd_page(pud_t *pud, unsigned long addr) +int pmd_free_pte_page(pmd_t *pmdp, unsigned long addr) { - return pud_none(*pud); + pmd_t *table; + + if (pmd_present(READ_ONCE(*pmdp))) { + table = __va(pmd_val(*pmdp)); + pmd_clear(pmdp); + __flush_tlb_kernel_pgtable(addr); + free_page((unsigned long) table); + } + return 1; } -int pmd_free_pte_page(pmd_t *pmd, unsigned long addr) +int pud_free_pmd_page(pud_t *pudp, unsigned long addr) { - return pmd_none(*pmd); + pmd_t *table; + int i; + + if (pud_present(READ_ONCE(*pudp))) { + table = __va(pud_val(*pudp)); + for (i = 0; i < PTRS_PER_PMD; i++) + pmd_free_pte_page(&table[i], addr + (i * PMD_SIZE)); + + pud_clear(pudp); + __flush_tlb_kernel_pgtable(addr); + free_page((unsigned long) table); + } + return 1; } -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project