From patchwork Thu Jan 2 12:39:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Murray X-Patchwork-Id: 11315665 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 538766C1 for ; Thu, 2 Jan 2020 12:39:19 +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 2D58A21D7D for ; Thu, 2 Jan 2020 12:39:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="oVTsW5Xp" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D58A21D7D 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:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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:In-Reply-To:References: List-Owner; bh=Kncm4Kjz8XswDtSutaRHrh2J4Tg4z46sqa6lo4Y6Wac=; b=oVTsW5XpdhzJlA bCR0eHTz8ZCdxQU3yRYrOSc0zqE2OAP4R0OKxVs8PwkCBP2fvpsx7UVOC3DdIZnvEsNNcWLaQHnm3 lDYOF0GiGe9Y4pVLhgllldpM7TPuvtPp9cxldsdKUnFpyTF61x78CnJmG/A92dy2cjYVc3KqD3Cuu 1Xgp1vmpAjMCBmv/nBWJLlnLZjPQdfOrMT/D7EtAMO8Cy3fN5JbBhfvpCAcdVHZ8eP13BomA8Xu6B zxSwBZSML8Z0i8MfYoE+kCxry5MDv5dckpV2uoX0NRQzvFlPoHzlVIalrgxDRhrtf5a+B64apoNsH phRdHrcS9L8wdidkJXSg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1imzl0-0005ZC-OP; Thu, 02 Jan 2020 12:39:18 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1imzkx-0005Y2-Je for linux-arm-kernel@lists.infradead.org; Thu, 02 Jan 2020 12:39:16 +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 6AF881FB; Thu, 2 Jan 2020 04:39:12 -0800 (PST) Received: from e119886-lin.cambridge.arm.com (unknown [10.37.6.20]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E21D93F703; Thu, 2 Jan 2020 04:39:10 -0800 (PST) From: Andrew Murray To: Catalin Marinas , Will Deacon , Marc Zyngier , Mark Rutland Subject: [PATCH v3 0/3] arm64: perf: Add support for ARMv8.5-PMU 64-bit counters Date: Thu, 2 Jan 2020 12:39:02 +0000 Message-Id: <20200102123905.29360-1-andrew.murray@arm.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200102_043915_692599_6ECC5D18 X-CRM114-Status: GOOD ( 10.24 ) 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 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [217.140.110.172 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an 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: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Suzuki Kuruppassery Poulose Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org At present ARMv8 event counters are limited to 32-bits, though by using the CHAIN event it's possible to combine adjacent counters to achieve 64-bits. The perf config1:0 bit can be set to use such a configuration. With the introduction of ARMv8.5-PMU support, all event counters can now be used as 64-bit counters. Let's add support for 64-bit event counters. As KVM doesn't yet support 64-bit event counters, we also trap and emulate the Debug Feature Registers to limit the PMU version a guest sees to PMUv3 for ARMv8.4. Tested by running the following perf command on both guest and host and ensuring that the figures are very similar: perf stat -e armv8_pmuv3/inst_retired,long=1/ \ -e armv8_pmuv3/inst_retired,long=0/ -e cycles Changes since v2: - Rebased onto v5.5-rc4 - Mask 'cap' value to 'width' in cpuid_feature_cap_signed_field_width Changes since v1: - Rebased onto v5.5-rc1 Andrew Murray (3): arm64: cpufeature: Extract capped fields KVM: arm64: limit PMU version to ARMv8.4 arm64: perf: Add support for ARMv8.5-PMU 64-bit counters arch/arm64/include/asm/cpufeature.h | 16 ++++++ arch/arm64/include/asm/perf_event.h | 3 +- arch/arm64/include/asm/sysreg.h | 4 ++ arch/arm64/kernel/perf_event.c | 86 +++++++++++++++++++++++------ arch/arm64/kvm/sys_regs.c | 36 +++++++++++- include/linux/perf/arm_pmu.h | 1 + 6 files changed, 126 insertions(+), 20 deletions(-)