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Mon, 30 Apr 2018 07:42:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1525074139; bh=swHMmpGOMeJEu+AQwrWMNOjuNZVaqGhk/HuSQzYnKzA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=blYnc/ty/y8ddK1l6y3RbT6ZqImRhmTWVXq9qkvUo4HugFXZ9TVjF8qM7boO8ECdC tkTrvWHS+Rmj6d/PJmImzokxozTgK/oMvH+1DBs/+NfhZte+CdD6yvW6eFOJsnBa1n TQVMtimkpCoAzlBylzpPf0u+Tw4Kfwcpv0q6Tlbg= 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 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180430_004241_831861_853918E9 X-CRM114-Status: GOOD ( 14.75 ) 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: linux-arch@vger.kernel.org, Philip Elcan , Chintan Pandya , Toshi Kani , Greg Kroah-Hartman , Joerg Roedel , Dave Hansen , linux-kernel@vger.kernel.org, Kristina Martsenko , Ingo Molnar , James Morse , "H. Peter Anvin" , Thomas Gleixner , Vitaly Kuznetsov , linux-arm-kernel@lists.infradead.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 | 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; }