From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZq6tlrTroGHtzPGh68JbOj4tY6PwxUTISHqfDqa9MBW8O2ZXY+5jaiN+/CTREs5RPY3lv3p ARC-Seal: i=1; a=rsa-sha256; t=1525074151; cv=none; d=google.com; s=arc-20160816; b=hJS929t+9Q/wMHhvtZbO6VZISd3gWvOrRHpZK6qAuVQf/8JZhbvh8M3tGLvyBLO+qn Rke5Ir8rm6gjskFURlAhvWVT8ohms+RZ6HRFVHzHixwIT80Ypr3bSf5JJNChpn/255p6 hP/rZgSNgLgF2semqLUqFZbG81o8IYKhSFkjGvl3mrWPh2KgL3eelngJyanrGamfXD6G xZe2BtKPYTVSIbf2x/EN7RXEw/1WeETETBcDZAUeF+hqeNOpnLgCS37XikonIoCBEytb cGydkjEJ2Vvoee/1t6W0VeerA5wDDVa/HtnAjGqWEHvJQCnkosEtGY8Aes9/3zgLU93+ 38jQ== 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=dFCUZ2bqZ7EZbFIHQFttugu4BNHNwdfKZVftTZHgg7Lo6M2gmvX/2x804MxqSkKSzp yU6Z4vWAxL5dwky64VkR5WxFCThzmAyBEWuI1SAIHqxsK2IhguW5lW6OJGScr3O5cCrD PawxyE5Ts2ojzOeSUJT4v20nNwmpeWyyY0XcDFZ39FBT5VqRsMOgcFShVHYkRstG8zp4 BiLt3GHe4awQMlohSIC9YKllE3IWlUnzRYzMn8ruivHFMarssa9ApGXx4Z/DO/OPlF1P ws1eXvPd9X74ViufJYUqxdqn2JgJAZXOihd7ZR8jQwJf6YBhTmN3tuF+TNqCpDpHA4rI nFXA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=kFtTpmva; dkim=pass header.i=@codeaurora.org header.s=default header.b=blYnc/ty; 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=kFtTpmva; dkim=pass header.i=@codeaurora.org header.s=default header.b=blYnc/ty; 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 771F060FAA 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 , Arnd Bergmann , Mark Rutland , Ard Biesheuvel , Marc Zyngier , Andrew Morton Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Philip Elcan , James Morse , Kristina Martsenko , Toshi Kani , Dave Hansen , Vitaly Kuznetsov , Joerg Roedel , Greg Kroah-Hartman , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Chintan Pandya Subject: [PATCH v9 3/4] arm64: Implement page table free interfaces Date: Mon, 30 Apr 2018 13:11:33 +0530 Message-Id: <1525074094-25839-4-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1525074094-25839-1-git-send-email-cpandya@codeaurora.org> References: <1525074094-25839-1-git-send-email-cpandya@codeaurora.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1599156152916121293?= X-GMAIL-MSGID: =?utf-8?q?1599156152916121293?= 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: cpandya@codeaurora.org (Chintan Pandya) Date: Mon, 30 Apr 2018 13:11:33 +0530 Subject: [PATCH v9 3/4] arm64: Implement page table free interfaces In-Reply-To: <1525074094-25839-1-git-send-email-cpandya@codeaurora.org> References: <1525074094-25839-1-git-send-email-cpandya@codeaurora.org> Message-ID: <1525074094-25839-4-git-send-email-cpandya@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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