From patchwork Mon Jan 24 20:12:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 1583657 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=dNcpJpuD; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4JjLsp2VYVz9t5H for ; Tue, 25 Jan 2022 07:18:54 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356480AbiAXUSs (ORCPT ); Mon, 24 Jan 2022 15:18:48 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:54004 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379803AbiAXUMl (ORCPT ); Mon, 24 Jan 2022 15:12:41 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 282ADB8122F; Mon, 24 Jan 2022 20:12:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D08D0C340E5; Mon, 24 Jan 2022 20:12:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643055157; bh=k0CllSwHGT9rmu0vbmh6ZFyrg4eZL+tcUYKDcHtokck=; h=From:To:Cc:Subject:Date:From; b=dNcpJpuDfTr0anHF7o9ez44+ZKDOzR0fLPRNpho2K1oab5DBhRYRfBAc6az2gqR/q yqBlb2F8vQm2ouqWzNXAiGjSzGHMn9P/UNjciQfP0AbUlUSxDo+Ct22sUUwQTapzgy mZmycrfM6FwCwz9z1v9dhCpeOlFga3SFqB5O5GLj9PgOxLdlgdvjMWP4TIaj8l7/mW KY0vuvF/9gqTndnmN3otmJfKLQCl++f/uhabvctNv7pB/qlgULecZ2oRE2chdhnAvC I1Gbt61Rm4ZFhAOFbOjmwondBqnRbUN+vtslPw/fV9Nq8xYwGNikic7hSd/mUASbcq xZQRzx/juvUNQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nC5hb-002Y3f-LZ; Mon, 24 Jan 2022 20:12:35 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Mark Rutland , Will Deacon , Hector Martin , Sven Peter , Alyssa Rosenzweig , Rob Herring , Thomas Gleixner , Dougall , kernel-team@android.com Subject: [PATCH v4 00/10] drivers/perf: CPU PMU driver for Apple M1 Date: Mon, 24 Jan 2022 20:12:21 +0000 Message-Id: <20220124201231.298961-1-maz@kernel.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, will@kernel.org, marcan@marcan.st, sven@svenpeter.dev, alyssa@rosenzweig.io, robh+dt@kernel.org, tglx@linutronix.de, dougallj@gmail.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The M1 SoC embeds a per-CPU PMU that has a very different programming interface compared to the architected PMUv3 that is normally present on standard implementations. This small series adds a driver for this HW by leveraging the arm_pmu infrastructure, resulting in a rather simple driver. Of course, we know next to nothing about the actual events this PMU counts, aside from CPU cycles and instructions. Everything else is undocumented (though as Dougall pointed out, someone could extract the relevant information from a macOS install if they wanted -- I don't). I'm looking at allowing the perf userspace tool to load the event descriptions at runtime, which would probably help. * From v3 [3]: - DT binding fixes - Typo fixes (and probably more added) - Rebased on 5.17-rc1 * From v2 [2]: - Reworked the way the FIQ virtual affinity is exposed (now coming from the DT instead of being internal to the irqchip driver) - Dropped the locking from the PMU driver after Mark's review - Required the exclude_guest flag to be set, as the PMU doesn't seem to be able to count guest events, at least by default - Dropped the counter-stop on interrupt and instead stop the whole PMU on interrupt - Dropped the kernel taint, as I couldn't find a good way to do that on first use - Collected RBs from Hector * From v1 [1]: - Added a few comments clarifying the event mapping to counters - Spelling fixes - Collected Acks from Rob [1] https://lore.kernel.org/r/20211113115429.4027571-1-maz@kernel.org [2] https://lore.kernel.org/r/20211201134909.390490-1-maz@kernel.org [3] https://lore.kernel.org/r/20211214182634.727330-1-maz@kernel.org Marc Zyngier (10): dt-bindings: arm-pmu: Document Apple PMU compatible strings dt-bindings: apple,aic: Add CPU PMU per-cpu pseudo-interrupts dt-bindings: apple,aic: Add affinity description for per-cpu pseudo-interrupts irqchip/apple-aic: Parse FIQ affinities from device-tree irqchip/apple-aic: Wire PMU interrupts arm64: dts: apple: Add t8103 PMU interrupt affinities arm64: dts: apple: Add t8303 PMU nodes irqchip/apple-aic: Move PMU-specific registers to their own include file drivers/perf: arm_pmu: Handle 47 bit counters drivers/perf: Add Apple icestorm/firestorm CPU PMU driver .../devicetree/bindings/arm/pmu.yaml | 2 + .../interrupt-controller/apple,aic.yaml | 29 + arch/arm64/boot/dts/apple/t8103.dtsi | 24 + arch/arm64/include/asm/apple_m1_pmu.h | 64 ++ drivers/irqchip/irq-apple-aic.c | 94 ++- drivers/perf/Kconfig | 7 + drivers/perf/Makefile | 1 + drivers/perf/apple_m1_cpu_pmu.c | 584 ++++++++++++++++++ drivers/perf/arm_pmu.c | 2 + .../interrupt-controller/apple-aic.h | 2 + include/linux/perf/arm_pmu.h | 2 + 11 files changed, 789 insertions(+), 22 deletions(-) create mode 100644 arch/arm64/include/asm/apple_m1_pmu.h create mode 100644 drivers/perf/apple_m1_cpu_pmu.c