From mboxrd@z Thu Jan 1 00:00:00 1970 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 phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1762BC04A68 for ; Thu, 28 Jul 2022 07:10:52 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id BD44C841B4; Thu, 28 Jul 2022 09:10:31 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=denx.de Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1658992232; bh=sgTH6rJXCUoPZAx9iW7ycfdvmOUXVQChH4GaAdYZ+NA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=KXY44FiiCYNxUI/XA2f2zL3DdlcgYPi/ZAAa1OoirRmK2m11aThBmCHoyktOCFiP6 0nQVaAnFN8DhUs2HuLOZnNuO8A/OFlLx0o833i2vRgak1wKTWolNOGjUMDjdLywf0i hBIRcIck3jlrrgG0tqdvihB9CBuA7CjZ403FElosscXEoqbi2cQWYzl/0EGSo7Oksj 5vMjlHjt/lLrGBDgEGFbKIGyng1CiN2SyNMLvLz1JlEB7+Jc6uutalRkB1Hu7Svs22 4MXdKatvwGh1EndCT9mB6n3iDgjN22KGCrHfB8AvXmg173hiUPG30+RDTk6lAXbegG OvNm/reWCoVsg== Received: by phobos.denx.de (Postfix, from userid 109) id 6178784196; Thu, 28 Jul 2022 09:09:58 +0200 (CEST) Received: from mout-u-204.mailbox.org (mout-u-204.mailbox.org [80.241.59.204]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id D962C84196 for ; Thu, 28 Jul 2022 09:09:51 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=denx.de Authentication-Results: phobos.denx.de; spf=fail smtp.mailfrom=sr@denx.de Received: from smtp2.mailbox.org (smtp2.mailbox.org [10.196.197.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-u-204.mailbox.org (Postfix) with ESMTPS id 4Lthbh5V87z9swD; Thu, 28 Jul 2022 09:09:36 +0200 (CEST) From: Stefan Roese To: u-boot@lists.denx.de Cc: trini@konsulko.com, sjg@chromium.org, cchavva@marvell.com, awilliams@marvell.com Subject: [PATCH v2 2/7] cyclic: Add basic support for cyclic function execution infrastruture Date: Thu, 28 Jul 2022 09:09:29 +0200 Message-Id: <20220728070934.641674-3-sr@denx.de> In-Reply-To: <20220728070934.641674-1-sr@denx.de> References: <20220728070934.641674-1-sr@denx.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.6 at phobos.denx.de X-Virus-Status: Clean Add the basic infrastructure to periodically execute code, e.g. all 100ms. Examples for such functions might be LED blinking etc. The functions that are hooked into this cyclic list should be small timewise as otherwise the execution of the other code that relies on a high frequent polling (e.g. UART rx char ready check) might be delayed too much. This patch also adds the Kconfig option CONFIG_CYCLIC_MAX_CPU_TIME_US, which configures the max allowed time for such a cyclic function. If it's execution time exceeds this time, this cyclic function will get removed from the cyclic list. How is this cyclic functionality executed? The following patch integrates the main function responsible for calling all registered cyclic functions cyclic_run() into the common WATCHDOG_RESET macro. This guarantees that cyclic_run() is executed very often, which is necessary for the cyclic functions to get scheduled and executed at their configured periods. This cyclic infrastructure will be used by a board specific function on the NIC23 MIPS Octeon board, which needs to check periodically, if a PCIe FLR has occurred. Signed-off-by: Stefan Roese --- v2: - Also add cyclic_register() and cyclic_unregister() as empty functions when CONFIG_CYCLIC is not defined - Misc minor changes MAINTAINERS | 6 +++ common/Kconfig | 20 +++++++++ common/Makefile | 1 + common/cyclic.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++ include/cyclic.h | 97 ++++++++++++++++++++++++++++++++++++++++ 5 files changed, 236 insertions(+) create mode 100644 common/cyclic.c create mode 100644 include/cyclic.h diff --git a/MAINTAINERS b/MAINTAINERS index f371d864f29b..4490b9d3737a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -788,6 +788,12 @@ T: git https://source.denx.de/u-boot/custodians/u-boot-coldfire.git F: arch/m68k/ F: doc/arch/m68k.rst +CYCLIC +M: Stefan Roese +S: Maintained +F: common/cyclic.c +F: include/cyclic.h + DFU M: Lukasz Majewski S: Maintained diff --git a/common/Kconfig b/common/Kconfig index e7914ca750a3..a6a94ab8dfbf 100644 --- a/common/Kconfig +++ b/common/Kconfig @@ -545,6 +545,26 @@ config DISPLAY_BOARDINFO_LATE menu "Start-up hooks" +config CYCLIC + bool "General-purpose cyclic execution mechanism" + help + This enables a general-purpose cyclic execution infrastructure, + to allow "small" (run-time wise) functions to be executed at + a specified frequency. Things like LED blinking or watchdog + triggering are examples for such tasks. + +if CYCLIC + +config CYCLIC_MAX_CPU_TIME_US + int "Sets the max allowed time for a cyclic function in us" + default 1000 + help + The max allowed time for a cyclic function in us. If a functions + takes longer than this duration this function will get unregistered + automatically. + +endif # CYCLIC + config EVENT bool "General-purpose event-handling mechanism" default y if SANDBOX diff --git a/common/Makefile b/common/Makefile index 2ed8672c3ac1..1d56c9f2895a 100644 --- a/common/Makefile +++ b/common/Makefile @@ -84,6 +84,7 @@ obj-y += malloc_simple.o endif endif +obj-$(CONFIG_CYCLIC) += cyclic.o obj-$(CONFIG_$(SPL_TPL_)EVENT) += event.o obj-$(CONFIG_$(SPL_TPL_)HASH) += hash.o diff --git a/common/cyclic.c b/common/cyclic.c new file mode 100644 index 000000000000..6e7ebbe7b218 --- /dev/null +++ b/common/cyclic.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * A general-purpose cyclic execution infrastructure, to allow "small" + * (run-time wise) functions to be executed at a specified frequency. + * Things like LED blinking or watchdog triggering are examples for such + * tasks. + * + * Copyright (C) 2022 Stefan Roese + */ + +#include +#include +#include +#include +#include +#include +#include + +struct list_head cyclic_list; +static bool cyclic_ready; +static bool cyclic_running; + +struct cyclic_struct *cyclic_register(cyclic_func_t func, uint64_t delay_us, + const char *name, void *ctx) +{ + struct cyclic_struct *cyclic; + + if (!cyclic_ready) { + pr_debug("Cyclic IF not ready yet\n"); + return NULL; + } + + cyclic = calloc(1, sizeof(struct cyclic_struct)); + if (!cyclic) { + pr_debug("Memory allocation error\n"); + return NULL; + } + + /* Store values in struct */ + cyclic->func = func; + cyclic->ctx = ctx; + cyclic->name = strdup(name); + cyclic->delay_us = delay_us; + cyclic->start_time_us = timer_get_us(); + list_add_tail(&cyclic->list, &cyclic_list); + + return cyclic; +} + +int cyclic_unregister(struct cyclic_struct *cyclic) +{ + list_del(&cyclic->list); + free(cyclic); + + return 0; +} + +void cyclic_run(void) +{ + struct cyclic_struct *cyclic, *tmp; + uint64_t now, cpu_time; + + /* Prevent recursion */ + if (cyclic_running) + return; + + cyclic_running = true; + list_for_each_entry_safe(cyclic, tmp, &cyclic_list, list) { + /* + * Check if this cyclic function needs to get called, e.g. + * do not call the cyclic func too often + */ + now = timer_get_us(); + if (time_after_eq64(now, cyclic->next_call)) { + /* Call cyclic function and account it's cpu-time */ + cyclic->next_call = now + cyclic->delay_us; + cyclic->func(cyclic->ctx); + cyclic->run_cnt++; + cpu_time = timer_get_us() - now; + cyclic->cpu_time_us += cpu_time; + + /* Check if cpu-time exceeds max allowed time */ + if (cpu_time > CONFIG_CYCLIC_MAX_CPU_TIME_US) { + pr_err("cyclic function %s took too long: %lldus vs %dus max, disabling\n", + cyclic->name, cpu_time, + CONFIG_CYCLIC_MAX_CPU_TIME_US); + + /* Unregister this cyclic function */ + cyclic_unregister(cyclic); + } + } + } + cyclic_running = false; +} + +int cyclic_uninit(void) +{ + struct cyclic_struct *cyclic, *tmp; + + list_for_each_entry_safe(cyclic, tmp, &cyclic_list, list) + cyclic_unregister(cyclic); + + return 0; +} + +int cyclic_init(void) +{ + INIT_LIST_HEAD(&cyclic_list); + cyclic_ready = true; + + return 0; +} diff --git a/include/cyclic.h b/include/cyclic.h new file mode 100644 index 000000000000..6b48113e056a --- /dev/null +++ b/include/cyclic.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * A general-purpose cyclic execution infrastructure, to allow "small" + * (run-time wise) functions to be executed at a specified frequency. + * Things like LED blinking or watchdog triggering are examples for such + * tasks. + * + * Copyright (C) 2022 Stefan Roese + */ + +#ifndef __cyclic_h +#define __cyclic_h + +#include +#include + +struct cyclic_struct { + void (*func)(void *ctx); + void *ctx; + char *name; + uint64_t delay_us; + uint64_t start_time_us; + uint64_t cpu_time_us; + uint64_t run_cnt; + uint64_t next_call; + struct list_head list; +}; + +/** Function type for cyclic functions */ +typedef void (*cyclic_func_t)(void *ctx); + +#if defined(CONFIG_CYCLIC) +/** + * cyclic_register - Register a new cyclic function + * + * @func: Function to call periodically + * @delay_us: Delay is us after which this function shall get executed + * @name: Cyclic function name/id + * @ctx: Context to pass to the function + * @return: pointer to cyclic_struct if OK, NULL on error + */ +struct cyclic_struct *cyclic_register(cyclic_func_t func, uint64_t delay_us, + const char *name, void *ctx); + +/** + * cyclic_unregister - Unregister a cyclic function + * + * @cyclic: Pointer to cyclic_struct of the function that shall be removed + * @return: 0 if OK, -ve on error + */ +int cyclic_unregister(struct cyclic_struct *cyclic); + +/** + * cyclic_init() - Set up cyclic functions + * + * Init a list of cyclic functions, so that these can be added as needed + */ +int cyclic_init(void); + +/** + * cyclic_uninit() - Clean up cyclic functions + * + * This removes all cyclic functions + */ +int cyclic_uninit(void); + +void cyclic_run(void); +#else +static inline struct cyclic_struct *cyclic_register(cyclic_func_t func, + uint64_t delay_us, + const char *name, + void *ctx) +{ + return NULL; +} + +static inline int cyclic_unregister(struct cyclic_struct *cyclic) +{ + return 0; +} + +static inline void cyclic_run(void) +{ +} + +static inline int cyclic_init(void) +{ + return 0; +} + +static inline int cyclic_uninit(void) +{ + return 0; +} +#endif + +#endif -- 2.37.1