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Fri, 25 May 2018 14:28:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1527258518; bh=E3bJKUst8q400eUBWt+1JR594kl0tgc/oGKBYx/7qOQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iN9owTLsAUxiCS63QrEHeuiZCmr4aeEDN7tcs/2YBpu4tUQt3F2D9kTQwkl8B9+/v 55bsOiceMV/anqKOpAq4ViSgm4G8W4lZpnazjbVtKPcGMMIRqKCBxOXYhy/PSL/w1e oJbQCABOyPqCjKXQ40wPqup4rvBEF9xOQ1kjrhk4= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8FAB960881 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 v11 3/4] arm64: Implement page table free interfaces Date: Fri, 25 May 2018 19:58:08 +0530 Message-Id: <1527258489-30473-4-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1527258489-30473-1-git-send-email-cpandya@codeaurora.org> References: <1527258489-30473-1-git-send-email-cpandya@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180525_072848_630656_634CD781 X-CRM114-Status: GOOD ( 12.74 ) 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 | 38 ++++++++++++++++++++++++++++++++++---- 1 file changed, 34 insertions(+), 4 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index da98828..5f2da5c 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 +974,41 @@ 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); + pte_t *table; + pmd_t pmd; + + pmd = READ_ONCE(*pmdp); + if (pmd_present(pmd)) { + table = __va(pmd_page_paddr(pmd)); + pmd_clear(pmdp); + __flush_tlb_kernel_pgtable(addr); + pte_free_kernel(NULL, 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; + pmd_t *entry; + pud_t pud; + unsigned long next, end; + + pud = READ_ONCE(*pudp); + if (pud_present(pud)) { + table = __va(pud_page_paddr(pud)); + entry = table; + next = addr; + end = addr + PUD_SIZE; + do { + pmd_free_pte_page(entry, next); + } while (entry++, next += PMD_SIZE, next != end); + + pud_clear(pudp); + __flush_tlb_kernel_pgtable(addr); + pmd_free(NULL, table); + } + return 1; }