From patchwork Wed Oct 9 08:42:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jia He X-Patchwork-Id: 11180803 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B9C8E1709 for ; Wed, 9 Oct 2019 08:43:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 917002190F for ; Wed, 9 Oct 2019 08:43:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 917002190F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id CC35E8E0006; Wed, 9 Oct 2019 04:43:17 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id C9A998E0003; Wed, 9 Oct 2019 04:43:17 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BD7E88E0006; Wed, 9 Oct 2019 04:43:17 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0136.hostedemail.com [216.40.44.136]) by kanga.kvack.org (Postfix) with ESMTP id 9A46C8E0003 for ; Wed, 9 Oct 2019 04:43:17 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 422EB180AD808 for ; Wed, 9 Oct 2019 08:43:17 +0000 (UTC) X-FDA: 76023606834.27.kitty73_56956ddc7a116 X-Spam-Summary: 10,1,0,8522bd3ac0409e4c,d41d8cd98f00b204,justin.he@arm.com,:catalin.marinas@arm.com:will@kernel.org:mark.rutland@arm.com:james.morse@arm.com:maz@kernel.org:willy@infradead.org:kirill.shutemov@linux.intel.com:linux-arm-kernel@lists.infradead.org:linux-kernel@vger.kernel.org::suzuki.poulose@arm.com:bp@alien8.de:hpa@zytor.com:x86@kernel.org:tglx@linutronix.de:akpm@linux-foundation.org:hejianet@gmail.com:kaly.xin@arm.com:nd@arm.com:justin.he@arm.com,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1345:1359:1437:1534:1541:1711:1730:1747:1777:1792:2393:2559:2562:2895:2901:3138:3139:3140:3141:3142:3352:3865:3866:3867:3868:3871:3872:4250:4321:5007:6119:6261:6737:7903:8634:10004:11026:11473:11657:11658:11914:12043:12048:12296:12297:12438:12555:12895:13069:13311:13357:13523:13524:14096:14181:14384:14394:14721:21080:21451:21627:30054:30070,0,RBL:217.140.110.172:@arm.com:.lbl8.mailshell.net-62.2.0.100 64.100.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,D omainCac X-HE-Tag: kitty73_56956ddc7a116 X-Filterd-Recvd-Size: 2860 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf01.hostedemail.com (Postfix) with ESMTP for ; Wed, 9 Oct 2019 08:43:14 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 81AC31000; Wed, 9 Oct 2019 01:43:14 -0700 (PDT) Received: from localhost.localdomain (entos-thunderx2-02.shanghai.arm.com [10.169.40.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CD89B3F68E; Wed, 9 Oct 2019 01:43:09 -0700 (PDT) From: Jia He To: Catalin Marinas , Will Deacon , Mark Rutland , James Morse , Marc Zyngier , Matthew Wilcox , "Kirill A. Shutemov" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Suzuki Poulose , Borislav Petkov , "H. Peter Anvin" , x86@kernel.org Cc: Thomas Gleixner , Andrew Morton , hejianet@gmail.com, Kaly Xin , nd@arm.com, Jia He Subject: [PATCH v11 1/4] arm64: cpufeature: introduce helper cpu_has_hw_af() Date: Wed, 9 Oct 2019 16:42:43 +0800 Message-Id: <20191009084246.123354-2-justin.he@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191009084246.123354-1-justin.he@arm.com> References: <20191009084246.123354-1-justin.he@arm.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: We unconditionally set the HW_AFDBM capability and only enable it on CPUs which really have the feature. But sometimes we need to know whether this cpu has the capability of HW AF. So decouple AF from DBM by a new helper cpu_has_hw_af(). Signed-off-by: Jia He Suggested-by: Suzuki Poulose Reviewed-by: Catalin Marinas --- arch/arm64/include/asm/cpufeature.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 9cde5d2e768f..1a95396ea5c8 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -659,6 +659,20 @@ static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange) default: return CONFIG_ARM64_PA_BITS; } } + +/* Check whether hardware update of the Access flag is supported */ +static inline bool cpu_has_hw_af(void) +{ + if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM)) { + u64 mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); + + return !!cpuid_feature_extract_unsigned_field(mmfr1, + ID_AA64MMFR1_HADBS_SHIFT); + } + + return false; +} + #endif /* __ASSEMBLY__ */ #endif