From patchwork Thu May 24 13:57:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chintan Pandya X-Patchwork-Id: 10424789 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2BD7F6032A for ; Thu, 24 May 2018 14:00:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0B0AB29572 for ; Thu, 24 May 2018 14:00:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A41652962B; Thu, 24 May 2018 14:00:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 778F7295A7 for ; Thu, 24 May 2018 14:00:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=S/701R/l/QXv2JgQBgJmMecc48erHtM0SSgGvtjVyH0=; b=X+hANR3dhzTUF3I8w+UiDFXvBW C8cquGCPG/RMJ6KF116x5qxmufpn1AX3kR4WgM1UXKosiqW7QRRay6mWeStR4egl+M75iHCXec8hW AZrHoqlr2+UKJ6hExuTMuhmFyz8CiE0LK53evas4+jGpJUX1zITENHqi4UM5uuFgUw5IMS0/yPZAk 2+NTLVvisbU+4afrN/WM+xBNwOQ0WMIgeqq2AezaZyQhXIPAoJTTpLAnEhhjbiKexV5ZMzKf4lO4k kYks4Yjn4fSbIWCPEzbMVjZo2XctY3Q+sEJ7Dgn8bTS7mDYu6lmGWFgw3pTstTUMlZstj+b5s/5LB o59iAMHg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fLqms-00089V-QC; Thu, 24 May 2018 14:00:14 +0000 Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fLqkz-0006If-9g for linux-arm-kernel@lists.infradead.org; Thu, 24 May 2018 13:58:28 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9A00460F8F; Thu, 24 May 2018 13:58:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1527170286; bh=7qYFydu7jKVG+PqZ5bWbjYtwM5RIPpdQKnhu6Qi1va0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MIQHlTJX9RB9cpjD1in2fJ4c1xK92vSNsWKh6OHcc9id1kXkRDZ9ZmySuIbRkf2NM By6M2hRjR5kKfp3l62+Qs5Dji1rgeocLs+aI1Ji8o9JQXLOBD1j9Yg28AUsepK5kwl +h3M3LEyD9Fh7DbH0lr02NWHMH53+vVHwzT2p48I= Received: from cpandya-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cpandya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id B91FF60C66; Thu, 24 May 2018 13:58:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1527170285; bh=7qYFydu7jKVG+PqZ5bWbjYtwM5RIPpdQKnhu6Qi1va0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NaEPVhKbJ6X+iaATHxOc1omVhWE4sMbXLS0+cpUsGqSeSj15mKkFmQRdd64C+dO9L XRnyVpKxRU38sSejeyXt/YhJkOlbvkxAea8eGE/gzIBu7DmCoane2dn9JQjFfwHej2 JkDoYSNH9yrcTC+/0xg/9pPBRkayvzMHcOVGOjSk= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B91FF60C66 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: will.deacon@arm.com, catalin.marinas@arm.com, mark.rutland@arm.com, labbott@redhat.com, akpm@linux-foundation.org Subject: [PATCH v10 3/4] arm64: Implement page table free interfaces Date: Thu, 24 May 2018 19:27:29 +0530 Message-Id: <1527170250-5291-4-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1527170250-5291-1-git-send-email-cpandya@codeaurora.org> References: <1527170250-5291-1-git-send-email-cpandya@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180524_065817_412619_60C7949B X-CRM114-Status: GOOD ( 13.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chintan Pandya , linux-arm-kernel@lists.infradead.org, toshi.kani@hpe.com, linux-kernel@vger.kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 --- arch/arm64/mm/mmu.c | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index da98828..17d9282 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 +974,37 @@ 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; + pmd_t pmd; + + pmd = READ_ONCE(*pmdp); + if (pmd_present(pmd)) { + table = __va(pmd_val(pmd)); + pmd_clear(pmdp); + __flush_tlb_kernel_pgtable(addr); + pte_free_kernel(NULL, (pte_t *) 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; + pud_t pud; + int i = 0; + + pud = READ_ONCE(*pudp); + if (pud_present(pud)) { + table = __va(pud_val(pud)); + do { + pmd_free_pte_page(&table[i], addr + (i * PMD_SIZE)); + } while (i++, i < PTRS_PER_PMD); + + pud_clear(pudp); + __flush_tlb_kernel_pgtable(addr); + pmd_free(NULL, table); + } + return 1; }