From patchwork Mon Feb 10 21:39:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Leach X-Patchwork-Id: 11374089 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 133F9109A for ; Mon, 10 Feb 2020 21:39:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE6CA20733 for ; Mon, 10 Feb 2020 21:39:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="d7whKnMC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727455AbgBJVjh (ORCPT ); Mon, 10 Feb 2020 16:39:37 -0500 Received: from mail-wr1-f66.google.com ([209.85.221.66]:37332 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727003AbgBJVjg (ORCPT ); Mon, 10 Feb 2020 16:39:36 -0500 Received: by mail-wr1-f66.google.com with SMTP id w15so9664673wru.4 for ; Mon, 10 Feb 2020 13:39:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=6oIieVyHz+8Iv3bRfW5vGqMYr+WnaVMb6rPDak3UbxY=; b=d7whKnMCCgC1xFBwxZmL6F0xxOIGyrRCFLYhOEoREnBLU7uoHpCYzYTboa2Uhy8s2t vcev8KgIY6+eivICrYYl4nGfET7L91gWmVpjBDb5X4Y1dWfaG29TQb91RN3Nb2fOBr7B +gWny4pyvKWUbBMDxNoo6a0CYgVszrx+6wsuWJbm5y5TETt/B9AS/fp/E6h7RFaVBGSt fRgAP6BUAl4t+g0LA5oQg6nncb3euxsVNIaThWl1m091Jn0IL0hOiizrz0zQFw+HOsrb nTE87qSHXp9NxofEWv/o/zulNSd4lGsr76svT++uACAv5tEc2Z3Bw1lWx9IjcsaEhl7M +tCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=6oIieVyHz+8Iv3bRfW5vGqMYr+WnaVMb6rPDak3UbxY=; b=UWlB2G5QFhtT+KiLsapf4BwdVNzp8MXy8i2+ioiXvDB6ksqlWieLGFB9BUoQelqXsx OCXq59tRU5XjAlgNYdfd8QPxRMya8YAB90Z7GaVIHHPYUQAnxDWxyfORwq92B5N6mzvC JJLWuAKSy9U8DHXK5pizQFYowmTku3bql1FYtM4U1acgmX8r2ua4K0B+pvrYup+kkd2m a5q3GDb01XoMJL6anNjJtKCDX1x64nV7rKRnJOTmO8+yUpizQn4Jo2oP5b4+wGo0IA5W 7vIGnhVQw7ocBUuvBcKF3cz1dpkskgvPeN4m7FC1kriMZY1RTUGAyZjD0RDTbFOjQjH7 aXbQ== X-Gm-Message-State: APjAAAWgyOk/97cYtiZYCoTsLt0VBam/CbRQGheGla1RDFdLexFTiFWm L4gfs1K3YJw91gGViCu4JeRvIQ== X-Google-Smtp-Source: APXvYqylCnt1h+aWJLVaieqgIzlpcvLdu9GTYCquy+tOi7cFbH0Fr9NOOh0YLX6zEsU3ODpGHjU5aA== X-Received: by 2002:adf:ecc2:: with SMTP id s2mr4053361wro.263.1581370773857; Mon, 10 Feb 2020 13:39:33 -0800 (PST) Received: from linaro.org ([2a00:23c5:6815:3901:a1cf:b00b:5683:ed40]) by smtp.gmail.com with ESMTPSA id u14sm2118582wrm.51.2020.02.10.13.39.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Feb 2020 13:39:33 -0800 (PST) From: Mike Leach To: mike.leach@linaro.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, coresight@lists.linaro.org, linux-doc@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, mathieu.poirier@linaro.org, suzuki.poulose@arm.com, robh+dt@kernel.org, maxime@cerno.tech, liviu.dudau@arm.com, sudeep.holla@arm.com, lorenzo.pieralisi@arm.com, agross@kernel.org, corbet@lwn.net Subject: [PATCH v9 00/15] CoreSight CTI Driver Date: Mon, 10 Feb 2020 21:39:09 +0000 Message-Id: <20200210213924.20037-1-mike.leach@linaro.org> X-Mailer: git-send-email 2.17.1 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org CTIs are defined in the device tree and associated with other CoreSight devices. The core CoreSight code has been modified to enable the registration of the CTI devices on the same bus as the other CoreSight components, but as these are not actually trace generation / capture devices, they are not part of the Coresight path when generating trace. However, the definition of the standard CoreSight device has been extended to include a reference to an associated CTI device, and the enable / disable trace path operations will auto enable/disable any associated CTI devices at the same time. Programming is at present via sysfs - a full API is provided to utilise the hardware capabilities. As CTI devices are unprogrammed by default, the auto enable describe above will have no effect until explicit programming takes place. A set of device tree bindings specific to the CTI topology has been defined. The driver accesses these in a platform agnostic manner, so ACPI bindings can be added later, once they have been agreed and defined for the CTI device. Documentation has been updated to describe both the CTI hardware, its use and programming in sysfs, and the new dts bindings required. Tested on DB410 board and Juno board, against the Linux 5.6-rc1, 5.5 trees. Changes since v8: 1) Use devm_ allocation in cti_match_fixup_csdev() to match other allocations. 2) Minor comment update per request. Changes since v7: NB: No functional driver changes in this set. Full set released for consistency, completeness and ease of use. 1) Updates to device tree bindings .yaml following comments from Rob Herring. Adds #size-cells and #address-cells to properties and constrained as required. Validated using dt_binding_check. 2) Minor typo fixes to cti documentation file. Changes since v6: NB: No functional driver changes in this set. Full set released for consistency, completeness and ease of use. 1) Updates to .yaml following comments from Maxime Ripard. Correct child node descriptions, fix validation, and ensure reg entries required in child nodes as per DeviceTree specification. 2) Update to Juno bindings to implement reg entry specification requirements. Changes since v5: 1) Fixed up device tree .yaml file. Using extra compatible string for v8 architecture CTI connections. 2) Ensure association code respects coresight mutex when setting cross referenced pointers. Add in shutdown code. 3) Multiple minor code fixes & rationalisation. Changes since v4: Multiple changes following feedback from Mathieu, Leo and Suzuki. 1) Dropped RFC tag - wider distribution 2) CTI bindings definition now presented as a .yaml file - tested with with 'dt-doc-validate' from devicetree.org/dt-schema project and in kernel build tree with 'make dtbs_check' per kernel docs. 3) Sysfs links to other CoreSight devices moved out of this set into a following set that deals with all CoreSight devices & sysfs links. 4) Documentation in .rst format and new directory following patchset in [1]. Extended example provided in docs. 5) Rationalised devicetree of_ specifics to use generic fwnode functions where possible to enable easier addition of ACPI support later. 6) Other minor changes as requested in feedback from last patchset. Changes since v3: 1) After discussion on CS mailing list, each CTI connection has a triggers sysfs directory with name and trigger signals listed for the connection. 2) Initial code for creating sysfs links between CoreSight components is introduced and implementation for CTI provided. This allows exploration of the CoreSight topology within the sysfs infrastructure. Patches for links between other CoreSight components to follow. 3) Power management - CPU hotplug and idle omitted from this set as ongoing developments may define required direction. Additional patch set to follow. 4) Multiple fixes applied as requested by reviewers esp. Matthieu, Suzuki and Leo. Changes since v2: Updates to allow for new features on coresight/next and feedback from Mathieu and Leo. 1) Rebase and restructuring to apply on top of ACPI support patch set, currently on coresight/next. of_coresight_cti has been renamed to coresight-cti-platform and device tree bindings added to this but accessed in a platform agnostic manner using fwnode for later ACPI support to be added. 2) Split the sysfs patch info a series of functional patches. 3) Revised the refcount and enabling support. 4) Adopted the generic naming protocol - CTIs are either cti_cpuN or cti_sysM 5) Various minor presentation /checkpatch issues highlighted in feedback. 6) revised CPU hotplug to cover missing cases needed by ETM. Changes since v1: 1) Significant restructuring of the source code. Adds cti-sysfs file and cti device tree file. Patches add per feature rather than per source file. 2) CPU type power event handling for hotplug moved to CoreSight core, with generic registration interface provided for all CPU bound CS devices to use. 3) CTI signal interconnection details in sysfs now generated dynamically from connection lists in driver. This to fix issue with multi-line sysfs output in previous version. 4) Full device tree bindings for DB410 and Juno provided (to the extent that CTI information is available). 5) AMBA driver update for UCI IDs are now upstream so no longer included in this set Mike Leach (15): coresight: cti: Initial CoreSight CTI Driver coresight: cti: Add sysfs coresight mgmt reg access. coresight: cti: Add sysfs access to program function regs coresight: cti: Add sysfs trigger / channel programming API dt-bindings: arm: Adds CoreSight CTI hardware definitions. coresight: cti: Add device tree support for v8 arch CTI coresight: cti: Add device tree support for custom CTI. coresight: cti: Enable CTI associated with devices. coresight: cti: Add connection information to sysfs dt-bindings: qcom: Add CTI options for qcom msm8916 dt-bindings: arm: Juno platform - add CTI entries to device tree. dt-bindings: hisilicon: Add CTI bindings for hi-6220 docs: coresight: Update documentation for CoreSight to cover CTI. docs: sysfs: coresight: Add sysfs ABI documentation for CTI Update MAINTAINERS to add reviewer for CoreSight. .../testing/sysfs-bus-coresight-devices-cti | 221 ++++ .../bindings/arm/coresight-cti.yaml | 336 +++++ .../devicetree/bindings/arm/coresight.txt | 7 + .../trace/coresight/coresight-ect.rst | 211 +++ Documentation/trace/coresight/coresight.rst | 13 + MAINTAINERS | 3 + arch/arm64/boot/dts/arm/juno-base.dtsi | 162 ++- arch/arm64/boot/dts/arm/juno-cs-r1r2.dtsi | 37 +- arch/arm64/boot/dts/arm/juno-r1.dts | 25 + arch/arm64/boot/dts/arm/juno-r2.dts | 25 + arch/arm64/boot/dts/arm/juno.dts | 25 + .../boot/dts/hisilicon/hi6220-coresight.dtsi | 130 +- arch/arm64/boot/dts/qcom/msm8916.dtsi | 85 +- drivers/hwtracing/coresight/Kconfig | 21 + drivers/hwtracing/coresight/Makefile | 3 + .../coresight/coresight-cti-platform.c | 485 +++++++ .../hwtracing/coresight/coresight-cti-sysfs.c | 1175 +++++++++++++++++ drivers/hwtracing/coresight/coresight-cti.c | 748 +++++++++++ drivers/hwtracing/coresight/coresight-cti.h | 235 ++++ .../hwtracing/coresight/coresight-platform.c | 20 + drivers/hwtracing/coresight/coresight-priv.h | 15 + drivers/hwtracing/coresight/coresight.c | 86 +- include/dt-bindings/arm/coresight-cti-dt.h | 37 + include/linux/coresight.h | 27 + 24 files changed, 4101 insertions(+), 31 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-cti create mode 100644 Documentation/devicetree/bindings/arm/coresight-cti.yaml create mode 100644 Documentation/trace/coresight/coresight-ect.rst create mode 100644 drivers/hwtracing/coresight/coresight-cti-platform.c create mode 100644 drivers/hwtracing/coresight/coresight-cti-sysfs.c create mode 100644 drivers/hwtracing/coresight/coresight-cti.c create mode 100644 drivers/hwtracing/coresight/coresight-cti.h create mode 100644 include/dt-bindings/arm/coresight-cti-dt.h