From patchwork Wed Jan 12 23:02:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winiarska, Iwona" X-Patchwork-Id: 12712032 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51D15C4332F for ; Wed, 12 Jan 2022 23:06:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235242AbiALXGa (ORCPT ); Wed, 12 Jan 2022 18:06:30 -0500 Received: from mga04.intel.com ([192.55.52.120]:11071 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235237AbiALXEs (ORCPT ); Wed, 12 Jan 2022 18:04:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1642028688; x=1673564688; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=SUiOSf+iVFlhMuk/upL7GA5ys7lvzJWXofYYXuCv1Jo=; b=RY1sXmrWyySRPWuliNeV6QZA6BRdP35qprx/LrOURzcNFwSeJVbLYwGX lWT1WDQ3HTj6sJh/TFXLUQg6mmp7ZCjsEYPt5Fs1dGVqLCgx43CvV27w8 7cC1lp4LsG3ElpLlCgNAQK+6JC71d8cMEKI74pvPv/C4DdEwR3iyd3wLT yOSOTg/6xI7//H0JLM9xzaPHP0r9h/DlAw3BFUgpdzrlrrc6PIIMXcF0M IHHBIKBEsILJIcBLSVJ4Xs/Tcb0Rz7e3xkaBvIJTqyXlOCqGOsW46WqOS XfsFIW6hJvHQfJ56Re1ZlHqZaEcHRL9pqo7OFqqdKgXHd0ciGdi3CpIi2 Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10225"; a="242689879" X-IronPort-AV: E=Sophos;i="5.88,284,1635231600"; d="scan'208";a="242689879" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2022 15:04:48 -0800 X-IronPort-AV: E=Sophos;i="5.88,284,1635231600"; d="scan'208";a="528808523" Received: from kstefans-mobl.ger.corp.intel.com (HELO localhost) ([10.249.154.174]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2022 15:04:40 -0800 From: Iwona Winiarska To: linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org, Greg Kroah-Hartman Cc: devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, Rob Herring , Joel Stanley , Andrew Jeffery , Jean Delvare , Guenter Roeck , Arnd Bergmann , Olof Johansson , Jonathan Corbet , Borislav Petkov , Pierre-Louis Bossart , Tony Luck , Andy Shevchenko , Dan Williams , Randy Dunlap , Zev Weiss , David Muller , Dave Hansen , Billy Tsai , Iwona Winiarska , Jason M Bills , Jae Hyun Yoo Subject: [PATCH v5 04/13] peci: Add core infrastructure Date: Thu, 13 Jan 2022 00:02:38 +0100 Message-Id: <20220112230247.982212-5-iwona.winiarska@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220112230247.982212-1-iwona.winiarska@intel.com> References: <20220112230247.982212-1-iwona.winiarska@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Intel processors provide access for various services designed to support processor and DRAM thermal management, platform manageability and processor interface tuning and diagnostics. Those services are available via the Platform Environment Control Interface (PECI) that provides a communication channel between the processor and the Baseboard Management Controller (BMC) or other platform management device. This change introduces PECI subsystem by adding the initial core module and API for controller drivers. Co-developed-by: Jason M Bills Signed-off-by: Jason M Bills Co-developed-by: Jae Hyun Yoo Signed-off-by: Jae Hyun Yoo Signed-off-by: Iwona Winiarska Reviewed-by: Pierre-Louis Bossart --- MAINTAINERS | 8 ++ drivers/Kconfig | 3 + drivers/Makefile | 1 + drivers/peci/Kconfig | 15 ++++ drivers/peci/Makefile | 5 ++ drivers/peci/core.c | 158 ++++++++++++++++++++++++++++++++++++++++ drivers/peci/internal.h | 16 ++++ include/linux/peci.h | 99 +++++++++++++++++++++++++ 8 files changed, 305 insertions(+) create mode 100644 drivers/peci/Kconfig create mode 100644 drivers/peci/Makefile create mode 100644 drivers/peci/core.c create mode 100644 drivers/peci/internal.h create mode 100644 include/linux/peci.h diff --git a/MAINTAINERS b/MAINTAINERS index dd36acc87ce6..3b079e193bf3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14922,6 +14922,14 @@ L: platform-driver-x86@vger.kernel.org S: Maintained F: drivers/platform/x86/peaq-wmi.c +PECI SUBSYSTEM +M: Iwona Winiarska +L: openbmc@lists.ozlabs.org (moderated for non-subscribers) +S: Supported +F: Documentation/devicetree/bindings/peci/ +F: drivers/peci/ +F: include/linux/peci.h + PENSANDO ETHERNET DRIVERS M: Shannon Nelson M: drivers@pensando.io diff --git a/drivers/Kconfig b/drivers/Kconfig index 0d399ddaa185..8d6cd5d08722 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -236,4 +236,7 @@ source "drivers/interconnect/Kconfig" source "drivers/counter/Kconfig" source "drivers/most/Kconfig" + +source "drivers/peci/Kconfig" + endmenu diff --git a/drivers/Makefile b/drivers/Makefile index a110338c860c..020780b6b4d2 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -187,3 +187,4 @@ obj-$(CONFIG_GNSS) += gnss/ obj-$(CONFIG_INTERCONNECT) += interconnect/ obj-$(CONFIG_COUNTER) += counter/ obj-$(CONFIG_MOST) += most/ +obj-$(CONFIG_PECI) += peci/ diff --git a/drivers/peci/Kconfig b/drivers/peci/Kconfig new file mode 100644 index 000000000000..71a4ad81225a --- /dev/null +++ b/drivers/peci/Kconfig @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0-only + +menuconfig PECI + tristate "PECI support" + help + The Platform Environment Control Interface (PECI) is an interface + that provides a communication channel to Intel processors and + chipset components from external monitoring or control devices. + + If you are building a Baseboard Management Controller (BMC) kernel + for Intel platform say Y here and also to the specific driver for + your adapter(s) below. If unsure say N. + + This support is also available as a module. If so, the module + will be called peci. diff --git a/drivers/peci/Makefile b/drivers/peci/Makefile new file mode 100644 index 000000000000..e789a354e842 --- /dev/null +++ b/drivers/peci/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0-only + +# Core functionality +peci-y := core.o +obj-$(CONFIG_PECI) += peci.o diff --git a/drivers/peci/core.c b/drivers/peci/core.c new file mode 100644 index 000000000000..73ad0a47fa9d --- /dev/null +++ b/drivers/peci/core.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2018-2021 Intel Corporation + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +static DEFINE_IDA(peci_controller_ida); + +static void peci_controller_dev_release(struct device *dev) +{ + struct peci_controller *controller = to_peci_controller(dev); + + mutex_destroy(&controller->bus_lock); + ida_free(&peci_controller_ida, controller->id); + kfree(controller); +} + +struct device_type peci_controller_type = { + .release = peci_controller_dev_release, +}; + +static struct peci_controller *peci_controller_alloc(struct device *dev, + struct peci_controller_ops *ops) +{ + struct peci_controller *controller; + int ret; + + if (!ops->xfer) + return ERR_PTR(-EINVAL); + + controller = kzalloc(sizeof(*controller), GFP_KERNEL); + if (!controller) + return ERR_PTR(-ENOMEM); + + ret = ida_alloc_max(&peci_controller_ida, U8_MAX, GFP_KERNEL); + if (ret < 0) + goto err; + controller->id = ret; + + controller->ops = ops; + + controller->dev.parent = dev; + controller->dev.bus = &peci_bus_type; + controller->dev.type = &peci_controller_type; + + device_initialize(&controller->dev); + + mutex_init(&controller->bus_lock); + + return controller; + +err: + kfree(controller); + return ERR_PTR(ret); +} + +static void unregister_controller(void *_controller) +{ + struct peci_controller *controller = _controller; + + device_unregister(&controller->dev); + + fwnode_handle_put(controller->dev.fwnode); + + pm_runtime_disable(&controller->dev); +} + +/** + * devm_peci_controller_add() - add PECI controller + * @dev: device for devm operations + * @ops: pointer to controller specific methods + * + * In final stage of its probe(), peci_controller driver calls + * devm_peci_controller_add() to register itself with the PECI bus. + * + * Return: Pointer to the newly allocated controller or ERR_PTR() in case of failure. + */ +struct peci_controller *devm_peci_controller_add(struct device *dev, + struct peci_controller_ops *ops) +{ + struct peci_controller *controller; + int ret; + + controller = peci_controller_alloc(dev, ops); + if (IS_ERR(controller)) + return controller; + + ret = dev_set_name(&controller->dev, "peci-%d", controller->id); + if (ret) + goto err_put; + + pm_runtime_no_callbacks(&controller->dev); + pm_suspend_ignore_children(&controller->dev, true); + pm_runtime_enable(&controller->dev); + + device_set_node(&controller->dev, fwnode_handle_get(dev_fwnode(dev))); + + ret = device_add(&controller->dev); + if (ret) + goto err_fwnode; + + ret = devm_add_action_or_reset(dev, unregister_controller, controller); + if (ret) + return ERR_PTR(ret); + + return controller; + +err_fwnode: + fwnode_handle_put(controller->dev.fwnode); + + pm_runtime_disable(&controller->dev); + +err_put: + put_device(&controller->dev); + + return ERR_PTR(ret); +} +EXPORT_SYMBOL_NS_GPL(devm_peci_controller_add, PECI); + +struct bus_type peci_bus_type = { + .name = "peci", +}; + +static int __init peci_init(void) +{ + int ret; + + ret = bus_register(&peci_bus_type); + if (ret < 0) { + pr_err("peci: failed to register PECI bus type!\n"); + return ret; + } + + return 0; +} +module_init(peci_init); + +static void __exit peci_exit(void) +{ + bus_unregister(&peci_bus_type); +} +module_exit(peci_exit); + +MODULE_AUTHOR("Jason M Bills "); +MODULE_AUTHOR("Jae Hyun Yoo "); +MODULE_AUTHOR("Iwona Winiarska "); +MODULE_DESCRIPTION("PECI bus core module"); +MODULE_LICENSE("GPL"); diff --git a/drivers/peci/internal.h b/drivers/peci/internal.h new file mode 100644 index 000000000000..918dea745a86 --- /dev/null +++ b/drivers/peci/internal.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (c) 2018-2021 Intel Corporation */ + +#ifndef __PECI_INTERNAL_H +#define __PECI_INTERNAL_H + +#include +#include + +struct peci_controller; + +extern struct bus_type peci_bus_type; + +extern struct device_type peci_controller_type; + +#endif /* __PECI_INTERNAL_H */ diff --git a/include/linux/peci.h b/include/linux/peci.h new file mode 100644 index 000000000000..26e0a4e73b50 --- /dev/null +++ b/include/linux/peci.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (c) 2018-2021 Intel Corporation */ + +#ifndef __LINUX_PECI_H +#define __LINUX_PECI_H + +#include +#include +#include +#include + +/* + * Currently we don't support any PECI command over 32 bytes. + */ +#define PECI_REQUEST_MAX_BUF_SIZE 32 + +struct peci_controller; +struct peci_request; + +/** + * struct peci_controller_ops - PECI controller specific methods + * @xfer: PECI transfer function + * + * PECI controllers may have different hardware interfaces - the drivers + * implementing PECI controllers can use this structure to abstract away those + * differences by exposing a common interface for PECI core. + */ +struct peci_controller_ops { + int (*xfer)(struct peci_controller *controller, u8 addr, struct peci_request *req); +}; + +/** + * struct peci_controller - PECI controller + * @dev: device object to register PECI controller to the device model + * @ops: pointer to device specific controller operations + * @bus_lock: lock used to protect multiple callers + * @id: PECI controller ID + * + * PECI controllers usually connect to their drivers using non-PECI bus, + * such as the platform bus. + * Each PECI controller can communicate with one or more PECI devices. + */ +struct peci_controller { + struct device dev; + struct peci_controller_ops *ops; + struct mutex bus_lock; /* held for the duration of xfer */ + u8 id; +}; + +struct peci_controller *devm_peci_controller_add(struct device *parent, + struct peci_controller_ops *ops); + +static inline struct peci_controller *to_peci_controller(void *d) +{ + return container_of(d, struct peci_controller, dev); +} + +/** + * struct peci_device - PECI device + * @dev: device object to register PECI device to the device model + * @controller: manages the bus segment hosting this PECI device + * @addr: address used on the PECI bus connected to the parent controller + * + * A peci_device identifies a single device (i.e. CPU) connected to a PECI bus. + * The behaviour exposed to the rest of the system is defined by the PECI driver + * managing the device. + */ +struct peci_device { + struct device dev; + u8 addr; +}; + +static inline struct peci_device *to_peci_device(struct device *d) +{ + return container_of(d, struct peci_device, dev); +} + +/** + * struct peci_request - PECI request + * @device: PECI device to which the request is sent + * @tx: TX buffer specific data + * @tx.buf: TX buffer + * @tx.len: transfer data length in bytes + * @rx: RX buffer specific data + * @rx.buf: RX buffer + * @rx.len: received data length in bytes + * + * A peci_request represents a request issued by PECI originator (TX) and + * a response received from PECI responder (RX). + */ +struct peci_request { + struct peci_device *device; + struct { + u8 buf[PECI_REQUEST_MAX_BUF_SIZE]; + u8 len; + } rx, tx; +}; + +#endif /* __LINUX_PECI_H */