From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A8BEC433DB for ; Tue, 26 Jan 2021 12:45:22 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id E53B823104 for ; Tue, 26 Jan 2021 12:45:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E53B823104 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3DBD34B286; Tue, 26 Jan 2021 07:45:21 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s3NsvDdYz6zy; Tue, 26 Jan 2021 07:45:20 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 289FD4B27F; Tue, 26 Jan 2021 07:45:20 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CA7364B27C for ; Tue, 26 Jan 2021 07:45:18 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qQck3xe3tTn9 for ; Tue, 26 Jan 2021 07:45:16 -0500 (EST) Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id CA13A4B21B for ; Tue, 26 Jan 2021 07:45:15 -0500 (EST) Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4DQ5yR0MSnzjDYt; Tue, 26 Jan 2021 20:43:59 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.184.42) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.498.0; Tue, 26 Jan 2021 20:45:02 +0800 From: Keqian Zhu To: , , , , Marc Zyngier , Will Deacon , Catalin Marinas Subject: [RFC PATCH 1/7] arm64: cpufeature: Add API to report system support of HWDBM Date: Tue, 26 Jan 2021 20:44:38 +0800 Message-ID: <20210126124444.27136-2-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20210126124444.27136-1-zhukeqian1@huawei.com> References: <20210126124444.27136-1-zhukeqian1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.184.42] X-CFilter-Loop: Reflected Cc: yubihong@huawei.com, Cornelia Huck , Kirti Wankhede , zhengchuan@huawei.com, Alex Williamson , Robin Murphy X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Though we already has a cpu capability named ARM64_HW_DBM, it's a LOCAL_CPU cap and conditionally compiled by CONFIG_ARM64_HW_AFDBM. This reports the system wide support of HW_DBM. Signed-off-by: Keqian Zhu --- arch/arm64/include/asm/cpufeature.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 9a555809b89c..dfded86c7684 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -664,6 +664,18 @@ static inline bool system_supports_mixed_endian(void) return val == 0x1; } +static inline bool system_supports_hw_dbm(void) +{ + u64 mmfr1; + u32 val; + + mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); + val = cpuid_feature_extract_unsigned_field(mmfr1, + ID_AA64MMFR1_HADBS_SHIFT); + + return val == 0x2; +} + static __always_inline bool system_supports_fpsimd(void) { return !cpus_have_const_cap(ARM64_HAS_NO_FPSIMD); -- 2.19.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm