From nobody Mon Feb 9 09:52:44 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1571236790; cv=none; d=zoho.com; s=zohoarc; b=BD+FtKtCxPGbYryPYewrfm3LzeLZCdz6IYCfsi0Hc/RbQhSD6DPWjcwRJjCQqgKUDHeS6mCMDRmR9/7UKb3JVJXZnkJMqNLoG8gjTbVAW0jjepnPY6xgZuHepok/AZjc7qxAc38NJaMw11BJ8KvSMnkvQBMvOuVbed0t0v9YIYA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1571236790; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=v/hsNSN5jDApl8dVpT6B91c1F4vI8PyCF0luRxCSefY=; b=oCeauSa/cL6IjyIKBXvdEk83KV7AZrBO4HUi95Qkvb8Rb45qvLZJLy9ABq3XTWp3vefRSeTeCb3/mx27NkjrBKvTLN1uGaRPhbCsE6T2UrvSB4x8877SQ2FnZkJTJcbwivWBEiHZLlnL/qG0ehl7zOb9bA3WeciE3Q7V6PFUFGI= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1571236790713922.95959245077; Wed, 16 Oct 2019 07:39:50 -0700 (PDT) Received: from localhost ([::1]:43486 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iKkSr-0002KW-2M for importer@patchew.org; Wed, 16 Oct 2019 10:39:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41717) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iKkNZ-00055Q-Ev for qemu-devel@nongnu.org; Wed, 16 Oct 2019 10:34:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iKkNY-0000iq-FL for qemu-devel@nongnu.org; Wed, 16 Oct 2019 10:34:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49760) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iKkNW-0000hQ-6W; Wed, 16 Oct 2019 10:34:18 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 64BF1883BA; Wed, 16 Oct 2019 14:34:17 +0000 (UTC) Received: from kamzik.brq.redhat.com (unknown [10.43.2.160]) by smtp.corp.redhat.com (Postfix) with ESMTP id E6DEC19C68; Wed, 16 Oct 2019 14:34:15 +0000 (UTC) From: Andrew Jones To: qemu-devel@nongnu.org, qemu-arm@nongnu.org Subject: [PATCH v1 2/5] timer: arm: Introduce functions to get the host cntfrq Date: Wed, 16 Oct 2019 16:34:07 +0200 Message-Id: <20191016143410.5023-3-drjones@redhat.com> In-Reply-To: <20191016143410.5023-1-drjones@redhat.com> References: <20191016143410.5023-1-drjones@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 16 Oct 2019 14:34:17 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, richard.henderson@linaro.org, bijan.mottahedeh@oracle.com, maz@kernel.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" When acceleration like KVM is in use it's necessary to use the host's counter frequency when converting ticks to or from time units. Signed-off-by: Andrew Jones Reviewed-by: Richard Henderson --- include/qemu/timer.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/qemu/timer.h b/include/qemu/timer.h index 85bc6eb00b21..8941ddea8242 100644 --- a/include/qemu/timer.h +++ b/include/qemu/timer.h @@ -1006,6 +1006,22 @@ static inline int64_t cpu_get_host_ticks(void) } #endif =20 +#if defined(__aarch64__) +static inline uint32_t cpu_get_host_tick_frequency(void) +{ + uint64_t frq; + asm volatile("mrs %0, cntfrq_el0" : "=3Dr" (frq)); + return frq; +} +#elif defined(__arm__) +static inline uint32_t cpu_get_host_tick_frequency(void) +{ + uint32_t frq; + asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=3Dr" (frq)); + return frq; +} +#endif + #ifdef CONFIG_PROFILER static inline int64_t profile_getclock(void) { --=20 2.21.0