From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhenyu Ye Subject: [RFC PATCH v5 0/2] arm64: tlb: add support for TLBI RANGE instructions Date: Wed, 8 Jul 2020 20:40:29 +0800 Message-ID: <20200708124031.1414-1-yezhenyu2@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: Received: from szxga05-in.huawei.com ([45.249.212.191]:7270 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728912AbgGHMkv (ORCPT ); Wed, 8 Jul 2020 08:40:51 -0400 Sender: linux-arch-owner@vger.kernel.org List-ID: To: catalin.marinas@arm.com, will@kernel.org, suzuki.poulose@arm.com, maz@kernel.org, steven.price@arm.com, guohanjun@huawei.com, olof@lixom.net Cc: yezhenyu2@huawei.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, arm@kernel.org, xiexiangyou@huawei.com, prime.zeng@hisilicon.com, zhangshaokun@hisilicon.com, kuhn.chenqun@huawei.com ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a range of input addresses. This series add support for this feature. I tested this feature on a FPGA machine whose cpus support the tlbi range. As the page num increases, the performance is improved significantly. When page num = 256, the performance is improved by about 10 times. Below is the test data when the stride = PTE: [page num] [classic] [tlbi range] 1 16051 13524 2 11366 11146 3 11582 12171 4 11694 11101 5 12138 12267 6 12290 11105 7 12400 12002 8 12837 11097 9 14791 12140 10 15461 11087 16 18233 11094 32 26983 11079 64 43840 11092 128 77754 11098 256 145514 11089 512 280932 11111 See more details in: https://lore.kernel.org/linux-arm-kernel/504c7588-97e5-e014-fca0-c5511ae0d256@huawei.com/ -- ChangeList: v5: - rebase this series on Linux 5.8-rc4. - remove the __TG macro. - move the odd range_pages check into loop. v4: combine the __flush_tlb_range() and the __directly into the same function with a single loop for both. v3: rebase this series on Linux 5.7-rc1. v2: Link: https://lkml.org/lkml/2019/11/11/348 Zhenyu Ye (2): arm64: tlb: Detect the ARMv8.4 TLBI RANGE feature arm64: tlb: Use the TLBI RANGE feature in arm64 arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/sysreg.h | 3 + arch/arm64/include/asm/tlbflush.h | 101 +++++++++++++++++++++++++----- arch/arm64/kernel/cpufeature.c | 10 +++ 4 files changed, 102 insertions(+), 15 deletions(-) -- 2.19.1