From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELvIRQN4uwiejggNFcNDdv87bMP8xaFjEw+dPotaO34knVlERyWdyitNaalEQUnyyANFE0P+ ARC-Seal: i=1; a=rsa-sha256; t=1521463289; cv=none; d=google.com; s=arc-20160816; b=U1KX8iA0Jl0Gq+MbEp2oq52GcqPmarx0GVSU7Yy9bPOMMgpJxtxSYbuJ2dkwMgGKQK 9EQwy0Zq0Av0kFbwCyrHeOeSBVUFJWG7aaAdLzGLrvO3YpWE8n9uxXIWFJw6o99oSCcy /x0pc1T/gRnxSFBJruMWBgNm+7Eih46IoZYtl6ITRCgXrN2RKIfSEnoxqvtNpptCJsig S8pjmVfG9APnbgL7BMI8OO1bHocYY92oMS63ynfPajfRQORHN1b1LWrKifEG5QGzKJ3l hVQHq9IzeoQL1FEPvCCgxOQmXzwsKjGSpbSd+FSuO/aIbwZnUkEikSkSCnjaPpJ2FXHQ P1Cw== 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=RUyRu+BmX3uuUIhAP/3YMJ5uvgcG7dJi8mXraNrl3kg=; b=WPbbv/KHfpZ4LMqBRPG7dMaLz6zUr3oB3gatWUN9SHXt+Obb92bvj+lqMD/u0sdteA y6cIctCwN2Ptt6Fpd5GwF5XnSGA13xX3WbAe4o5CxMKuMR+q6P5BOX9SdNWRuFse6CUg o4YKOZLW+5Q9AxBVYA2Zx7b67dOajwUcVpfii7kEWUo2Op8fIRLqhgEqbQKjMBc519io g1LiOnZsf3u1viS57SqJJ71TP5fIvBeFLNgUMjn4017JWuazTOc7PMrVh7DKYi3vmsvo eBLuraWfp6CQJjN6Cr0rxC87GOF3ZMyrJBXl/AgB2djOO00pD/md5qOM+ZnxvIw9BFKH L+Zg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=Ob0hQ4zd; dkim=pass header.i=@codeaurora.org header.s=default header.b=MrMXWP7R; 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=Ob0hQ4zd; dkim=pass header.i=@codeaurora.org header.s=default header.b=MrMXWP7R; 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 C847B60C67 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 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, toshi.kani@hpe.com, Chintan Pandya Subject: [PATCH v3 2/3] arm64: Implement page table free interfaces Date: Mon, 19 Mar 2018 18:10:55 +0530 Message-Id: <1521463256-19858-3-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1521463256-19858-1-git-send-email-cpandya@codeaurora.org> References: <1521463256-19858-1-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?1595369889153070930?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Implement pud_free_pmd_page() and pmd_free_pte_page(). Implementation requires, 1) Freeing of the un-used next level page tables 2) Clearing off the current pud/pmd entry 3) Invalidate TLB which could have previously valid but not stale entry Signed-off-by: Chintan Pandya --- arch/arm64/mm/mmu.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index da98828..c70f139 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) @@ -975,10 +976,35 @@ int pmd_clear_huge(pmd_t *pmdp) int pud_free_pmd_page(pud_t *pud, unsigned long addr) { - return pud_none(*pud); + pmd_t *pmd; + int i; + + pmd = __va(pud_val(*pud)); + if (pud_val(*pud)) { + for (i = 0; i < PTRS_PER_PMD; i++) + pmd_free_pte_page(&pmd[i], addr + (i * PMD_SIZE)); + + free_page((unsigned long) pmd); + pud_clear(pud); + flush_tlb_kernel_range(addr, addr + PUD_SIZE); + } + return 1; } int pmd_free_pte_page(pmd_t *pmd, unsigned long addr) { - return pmd_none(*pmd); + if (pmd_val(*pmd)) { + free_page((unsigned long)__va(pmd_val(*pmd))); + + pmd_clear(pmd); + /* + * FIXME: __flush_tlb_pgtable(&init_mm, addr) is + * ideal candidate here, which exactly + * flushes intermediate pgtables. But, + * this is broken (evident from tests). + * So, use safe TLB op unless that is fixed. + */ + flush_tlb_kernel_range(addr, addr + PMD_SIZE); + } + 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