From patchwork Fri May 3 23:24:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 10929441 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 82E5992A for ; Fri, 3 May 2019 23:24:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 661DA2878F for ; Fri, 3 May 2019 23:24:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5977C287EA; Fri, 3 May 2019 23:24:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4BC532878F for ; Fri, 3 May 2019 23:24:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726302AbfECXY1 (ORCPT ); Fri, 3 May 2019 19:24:27 -0400 Received: from foss.arm.com ([217.140.101.70]:40186 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726059AbfECXY1 (ORCPT ); Fri, 3 May 2019 19:24:27 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B4A6815A2; Fri, 3 May 2019 16:24:26 -0700 (PDT) Received: from mammon-tx2.austin.arm.com (mammon-tx2.austin.arm.com [10.118.29.246]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 268273F557; Fri, 3 May 2019 16:24:26 -0700 (PDT) From: Jeremy Linton To: linux-arm-kernel@lists.infradead.org Cc: linux-acpi@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, lenb@kernel.org, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, linuxarm@huawei.com, john.garry@huawei.com, Jeremy Linton Subject: [PATCH v3 0/5] arm64: SPE ACPI enablement Date: Fri, 3 May 2019 18:24:02 -0500 Message-Id: <20190503232407.37195-1-jeremy.linton@arm.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch series enables the Arm Statistical Profiling Extension (SPE) on ACPI platforms. This is possible because ACPI 6.3 uses a previously reserved field in the MADT to store the SPE interrupt number, similarly to how the normal PMU is described. If a consistent valid interrupt exists across all the cores in the system, a platform device is registered. That then triggers the SPE module, which runs as normal. We also add the ability to parse the PPTT for IDENTICAL cores. We then use this to sanity check the single SPE device we create. This creates a bit of a problem with respect to the specification though. The specification says that its legal for multiple tree's to exist in the PPTT. We handle this fine, but what happens in the case of multiple tree's is that the lack of a common node with IDENTICAL set forces us to assume that there are multiple non-IDENTICAL cores in the machine. v2->v3: Previously a function pointer was being used to handle the more complex node checking required by the IDENTICAL flag. This version simply checks for the IDENTICAL flag and calls flag_identical() to preform the revision and next node checks. (I think after reading Raphael's comments for the Nth time, this is actually what he was suggesting, which I initially miss interpreted). Modify subject of first patch so that its clear a that its a capitalization change rather, than a logical C 'case' change. v1->v2: Wrap the code which creates the SPE device in a new CONFIG_ARM_SPE_ACPI ifdef. Move arm,spe-v1 device name into common header file Some comment/case sensitivity/function name changes. Jeremy Linton (5): ACPI/PPTT: Trivial, change the capitalization of CPU ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens ACPI/PPTT: Modify node flag detection to find last IDENTICAL arm_pmu: acpi: spe: Add initial MADT/SPE probing perf: arm_spe: Enable ACPI/Platform automatic module loading arch/arm64/include/asm/acpi.h | 3 + drivers/acpi/pptt.c | 102 +++++++++++++++++++++++++--------- drivers/perf/Kconfig | 5 ++ drivers/perf/arm_pmu_acpi.c | 76 +++++++++++++++++++++++++ drivers/perf/arm_spe_pmu.c | 12 +++- include/linux/acpi.h | 5 ++ include/linux/perf/arm_pmu.h | 2 + 7 files changed, 176 insertions(+), 29 deletions(-)