From patchwork Wed Sep 25 02:59:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jia He X-Patchwork-Id: 11159943 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 A387214E5 for ; Wed, 25 Sep 2019 02:59:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7A626214AF for ; Wed, 25 Sep 2019 02:59:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A626214AF 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 BCC636B0010; Tue, 24 Sep 2019 22:59:42 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id BA20C6B0266; Tue, 24 Sep 2019 22:59:42 -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 AB92F6B0269; Tue, 24 Sep 2019 22:59:42 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0213.hostedemail.com [216.40.44.213]) by kanga.kvack.org (Postfix) with ESMTP id 8C6436B0010 for ; Tue, 24 Sep 2019 22:59:42 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 371B9180AD802 for ; Wed, 25 Sep 2019 02:59:42 +0000 (UTC) X-FDA: 75971937804.08.shelf29_3786e567b2305 X-Spam-Summary: 10,1,0,76b713b36ec4ec7c,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:punitagrawal@gmail.com:anshuman.khandual@arm.com:avanbrunt@nvidia.com:robin.murphy@arm.com:tglx@linutronix.de:akpm@linux-foundation.org:jglisse@redhat.com:rcampbell@nvidia.com:hejianet@gmail.com:kaly.xin@arm.com:nd@arm.com:justin.he@arm.com,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1345:1359:1437:1534:1541:1711:1730:1747:1777:1792:2393:2559:2562:2895:2901:3138:3139:3140:3141:3142:3352:3865:3866:3867:3868:3871:3872:4250:5007:6119:6261:6737:6742:7903:8634:10004:11026:11473:11657:11658:11914:12043:12048:12296:12297:12438:12555:12895:13069:13221:13229:13311:13357:13523:13524:14096:14181:14384:14394:14721:21080:21451:21627:30054:30064:30070,0,RBL:217.140.110.1 72:@arm. X-HE-Tag: shelf29_3786e567b2305 X-Filterd-Recvd-Size: 2986 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf10.hostedemail.com (Postfix) with ESMTP for ; Wed, 25 Sep 2019 02:59:41 +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 60B3F1570; Tue, 24 Sep 2019 19:59:40 -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 19A4B3F694; Tue, 24 Sep 2019 19:59:34 -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 Cc: Punit Agrawal , Anshuman Khandual , Alex Van Brunt , Robin Murphy , Thomas Gleixner , Andrew Morton , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Ralph Campbell , hejianet@gmail.com, Kaly Xin , nd@arm.com, Jia He Subject: [PATCH v9 1/3] arm64: cpufeature: introduce helper cpu_has_hw_af() Date: Wed, 25 Sep 2019 10:59:20 +0800 Message-Id: <20190925025922.176362-2-justin.he@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190925025922.176362-1-justin.he@arm.com> References: <20190925025922.176362-1-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 new helper cpu_has_hw_af(). Signed-off-by: Jia He Suggested-by: Suzuki Poulose Reported-by: kbuild test robot Reviewed-by: Catalin Marinas Reported-by: kbuild test robot " --- arch/arm64/include/asm/cpufeature.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index c96ffa4722d3..c2e3abd39faa 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -667,6 +667,16 @@ 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)) + return read_cpuid(ID_AA64MMFR1_EL1) & 0xf; + + return false; +} + #endif /* __ASSEMBLY__ */ #endif