From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx495jdczirxsZ/4y/ZVL6PR/SMWDQbKeOETrApAQYcFvGtRBTnS98ZiIevw3b75NSFbr3o+K ARC-Seal: i=1; a=rsa-sha256; t=1522742539; cv=none; d=google.com; s=arc-20160816; b=099sUzWExaOtLIURYW7pYk2MQnwQXaTCxbXQLto4vmofvRfXjG1er7FBcHSUXlnmIw tcUABqTEfu9Q8Amh66O0hX11He/oISX2FH7cqTWU3KoLRRuPGRttJLCTQnIzMAG9SDzw VhYbkqgXelYSjIm7EpoFpdKA96ZB9EzyB7oe0fq3ABB0wVTPHZBu0ktiSaoP1OoWQLMo qktd98a+vf4bSqK4nKEhvDSVDdP5R6svTnkXKgkoH3BuhYexRg5i9+tmHwL19iZmOdH6 0Oba9utHjp05V1te/OraHeCuJQ6puh2w5t6FJRDOUnGDpyuzZvYOJbf7YNMNmQV0K9nA 3YMQ== 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=/zJNIcJfeUuQacDi4LQ10egUIeDxiQg7R+ACXjZn1tc=; b=VY+vWfEsSRUuqNFUatwVeE8ahkivsVr9lwIx4mVVf4MqnGFhV2KPbmdA4QaF3uC7Lb Zfh7YhcW5S0rKvM4IBoBb7J4X5Li12W+FVsMxLrK9jJSLvwSQN6LyCkM/j6pEmZ8W8aG 4q9FSDSt53jYAGf9sFyHLHwvSRmSPb8Wgzxt3NVF1ECIlXs7hbjAXBGPjrHk4/kRgdB+ FIHCoiVlcKgDEOVJcCoqocDfsDPfPn5NIs6jjO6tQk1c2PAHz6zdoJMbRWWfiu3tu2cJ H37FVOd/nZ9b0GMmRfPQsZdTKWfytFPbXqjZ8D5K8z7HycXEWPA5LgnYkP+zOxXOdKVY msEQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=HDmVRHr2; dkim=pass header.i=@codeaurora.org header.s=default header.b=CQbN9WKH; 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=HDmVRHr2; dkim=pass header.i=@codeaurora.org header.s=default header.b=CQbN9WKH; 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 C677060C5F 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 v8 3/4] arm64: Implement page table free interfaces Date: Tue, 3 Apr 2018 13:30:45 +0530 Message-Id: <1522742446-5084-4-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1522742446-5084-1-git-send-email-cpandya@codeaurora.org> References: <1522742446-5084-1-git-send-email-cpandya@codeaurora.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1596711281107259340?= X-GMAIL-MSGID: =?utf-8?q?1596711281107259340?= 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 --- 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