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Wed, 28 Mar 2018 10:59:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1522234765; bh=EoQDni/I46zUgqil1h6zFM6vu4oyHoPuougag/EmHgk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B1HjLSgHc4aUB0t+4LTnpEKwTW2abq9CRuxsU0dRqqV7gbW9H/82HTiJL4N8av8XP ca3dl1COFsut1CEbX9Gjvf5ItphOjG2w59h1Io7ZCP5jTBiwPmy00q4hyl9anLEghV PJXsKqZoqnuS2+xe+W91s25Op6lri+LfornBvFD4= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 6BF1760F6E 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 Subject: [PATCH v6 1/2] arm64: Implement page table free interfaces Date: Wed, 28 Mar 2018 16:28:50 +0530 Message-Id: <1522234731-27397-4-git-send-email-cpandya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1522234731-27397-1-git-send-email-cpandya@codeaurora.org> References: <1522234731-27397-1-git-send-email-cpandya@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180328_035936_984941_4D093E05 X-CRM114-Status: GOOD ( 12.97 ) 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, arnd@arndb.de, ard.biesheuvel@linaro.org, marc.zyngier@arm.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, kristina.martsenko@arm.com, takahiro.akashi@linaro.org, james.morse@arm.com, Chintan Pandya , tglx@linutronix.de, akpm@linux-foundation.org, 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 --- From V5->V6: - Removed extra bool parameter 'tlb_inv' - Doing pmd/pud TLB invalidation with __flush_tlb_kernel_pgtable() 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; }