From patchwork Mon Sep 30 01:57:38 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jia He X-Patchwork-Id: 11165945 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 C82ED13B1 for ; Mon, 30 Sep 2019 01:58:18 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A6A9D21835 for ; Mon, 30 Sep 2019 01:58:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Osw7BwAn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A6A9D21835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=fAsz4hKp7Uvbds7P2biX/KIkILchGNN7rV1qmQLJbbY=; b=Osw7BwAnw0PB00nlfrCqsvBcWy mvRLigKxHJ4gDsX91b9c7GxdbtPFfewr2stcK4jU3d8QiujQYggMQLJYc23KnPw17c2uoxwe8BoL5 9CCXt/YG4OR/vLa5ewKatzanM4H7qqA+YSLO1I3lULnv035bKmlHUjpoCoK5he/PDdOlrl5hi1GPc A7cE93MY8cvZYd1ElcVqnWbdObYZ3uwzcMi2tnmdf6GWZQBPu4cj01+xC8mDFbuXNFJuNPCXiw+eH hUA3H0pNCkrQb/oGMrIMwUAPTdd/JA/qkHniuqTfiP64Zt542lY0F2N5xr3rUb8bLW/hD5Gz/19ix lprY5trQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iEkx7-0001xu-Va; Mon, 30 Sep 2019 01:58:17 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iEkwv-0001o5-JH for linux-arm-kernel@lists.infradead.org; Mon, 30 Sep 2019 01:58:07 +0000 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 7902C1570; Sun, 29 Sep 2019 18:57:57 -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 A23343F706; Sun, 29 Sep 2019 18:57:53 -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 Subject: [PATCH v10 1/3] arm64: cpufeature: introduce helper cpu_has_hw_af() Date: Mon, 30 Sep 2019 09:57:38 +0800 Message-Id: <20190930015740.84362-2-justin.he@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190930015740.84362-1-justin.he@arm.com> References: <20190930015740.84362-1-justin.he@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190929_185805_670108_D603951B X-CRM114-Status: GOOD ( 11.20 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jia He , Kaly Xin , Punit Agrawal , hejianet@gmail.com, Thomas Gleixner , Andrew Morton MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 Reviewed-by: Catalin Marinas --- 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 9cde5d2e768f..949bc7c85030 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -659,6 +659,16 @@ 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