From patchwork Mon Nov 29 11:07:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Bristot de Oliveira X-Patchwork-Id: 12644219 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 5B101C433F5 for ; Mon, 29 Nov 2021 11:10:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377115AbhK2LOD convert rfc822-to-8bit (ORCPT ); Mon, 29 Nov 2021 06:14:03 -0500 Received: from us-smtp-delivery-44.mimecast.com ([207.211.30.44]:20934 "EHLO us-smtp-delivery-44.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353728AbhK2LMB (ORCPT ); Mon, 29 Nov 2021 06:12:01 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-559-P5fvzSZ_PnGwB-OSRiAvkA-1; Mon, 29 Nov 2021 06:08:38 -0500 X-MC-Unique: P5fvzSZ_PnGwB-OSRiAvkA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 569D210144E0; Mon, 29 Nov 2021 11:08:36 +0000 (UTC) Received: from x1.com (unknown [10.22.8.188]) by smtp.corp.redhat.com (Postfix) with ESMTP id 94FAE5D9DE; Mon, 29 Nov 2021 11:08:31 +0000 (UTC) From: Daniel Bristot de Oliveira To: Steven Rostedt Cc: Tao Zhou , Daniel Bristot de Oliveira , Ingo Molnar , Tom Zanussi , Masami Hiramatsu , Juri Lelli , Clark Williams , John Kacur , Peter Zijlstra , Thomas Gleixner , Sebastian Andrzej Siewior , linux-rt-users@vger.kernel.org, linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V8 03/14] rtla: Add osnoise tool Date: Mon, 29 Nov 2021 12:07:41 +0100 Message-Id: In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=bristot@kernel.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org The osnoise tool is the interface for the osnoise tracer. The osnoise tool will have multiple "modes" with different outputs. At this point, no mode is included. The osnoise.c includes the osnoise_context abstraction. It serves to read-save-change-restore the default values from tracing/osnoise/ directory. When the context is deleted, the default values are restored. It also includes some other helper functions for managing osnoise tracer sessions. With these bits and pieces in place, we can start adding some functionality to rtla. Cc: Steven Rostedt Cc: Ingo Molnar Cc: Tom Zanussi Cc: Masami Hiramatsu Cc: Juri Lelli Cc: Clark Williams Cc: John Kacur Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Sebastian Andrzej Siewior Cc: Daniel Bristot de Oliveira Cc: linux-rt-users@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira --- tools/tracing/rtla/Makefile | 2 + tools/tracing/rtla/src/osnoise.c | 1013 ++++++++++++++++++++++++++++++ tools/tracing/rtla/src/osnoise.h | 95 +++ tools/tracing/rtla/src/rtla.c | 10 + 4 files changed, 1120 insertions(+) create mode 100644 tools/tracing/rtla/src/osnoise.c create mode 100644 tools/tracing/rtla/src/osnoise.h diff --git a/tools/tracing/rtla/Makefile b/tools/tracing/rtla/Makefile index d99ea2d8b87e..ba6f327e815a 100644 --- a/tools/tracing/rtla/Makefile +++ b/tools/tracing/rtla/Makefile @@ -60,6 +60,8 @@ install: $(INSTALL) -d -m 755 $(DESTDIR)$(BINDIR) $(INSTALL) rtla -m 755 $(DESTDIR)$(BINDIR) $(STRIP) $(DESTDIR)$(BINDIR)/rtla + @test ! -f $(DESTDIR)$(BINDIR)/osnoise || rm $(DESTDIR)$(BINDIR)/osnoise + ln -s $(DESTDIR)$(BINDIR)/rtla $(DESTDIR)$(BINDIR)/osnoise .PHONY: clean tarball clean: diff --git a/tools/tracing/rtla/src/osnoise.c b/tools/tracing/rtla/src/osnoise.c new file mode 100644 index 000000000000..7ef686dddc09 --- /dev/null +++ b/tools/tracing/rtla/src/osnoise.c @@ -0,0 +1,1013 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "osnoise.h" +#include "utils.h" + +/* + * osnoise_get_cpus - return the original "osnoise/cpus" content + * + * It also saves the value to be restored. + */ +char *osnoise_get_cpus(struct osnoise_context *context) +{ + char buffer[1024]; + char *cpus_path; + int retval; + + if (context->curr_cpus) + return context->curr_cpus; + + if (context->orig_cpus) + return context->orig_cpus; + + cpus_path = tracefs_get_tracing_file("osnoise/cpus"); + + context->cpus_fd = open(cpus_path, O_RDWR); + if (context->cpus_fd < 0) + goto out_err; + + retval = read(context->cpus_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + context->orig_cpus = strdup(buffer); + if (!context->orig_cpus) + goto out_close; + + tracefs_put_tracing_file(cpus_path); + + return context->orig_cpus; + +out_close: + close(context->cpus_fd); +out_err: + tracefs_put_tracing_file(cpus_path); + return NULL; +} + +/* + * osnoise_set_cpus - configure osnoise to run on *cpus + * + * "osnoise/cpus" file is used to set the cpus in which osnoise/timerlat + * will run. This function opens this file, saves the current value, + * and set the cpus passed as argument. + */ +int osnoise_set_cpus(struct osnoise_context *context, char *cpus) +{ + char *orig_cpus = osnoise_get_cpus(context); + int retval; + + if (!orig_cpus) + return -1; + + context->curr_cpus = strdup(cpus); + if (!context->curr_cpus) + return -1; + + retval = write(context->cpus_fd, cpus, strlen(cpus) + 1); + if (retval < (strlen(cpus) + 1)) { + free(context->curr_cpus); + context->curr_cpus = NULL; + return -1; + } + + return 0; +} + +/* + * osnoise_restore_cpus - restore the original "osnoise/cpus" + * + * osnoise_set_cpus() saves the original data for the "osnoise/cpus" + * file. This function restore the original config it was previously + * modified. + */ +void osnoise_restore_cpus(struct osnoise_context *context) +{ + int retval; + + if (!context->orig_cpus) + return; + + if (!context->curr_cpus) + return; + + /* nothing to do? */ + if (!strcmp(context->orig_cpus, context->curr_cpus)) + goto out_done; + + retval = write(context->cpus_fd, context->orig_cpus, strlen(context->orig_cpus)); + if (retval < strlen(context->orig_cpus)) + err_msg("could not restore original osnoise cpus\n"); + +out_done: + free(context->curr_cpus); + context->curr_cpus = NULL; +} + +/* + * osnoise_put_cpus - restore cpus config and cleanup data + */ +void osnoise_put_cpus(struct osnoise_context *context) +{ + osnoise_restore_cpus(context); + + if (!context->orig_cpus) + return; + + free(context->orig_cpus); + context->orig_cpus = NULL; + close(context->cpus_fd); + context->cpus_fd = CLOSED_FD; +} + +/* + * osnoise_get_runtime - return the original "osnoise/runtime_us" value + * + * It also saves the value to be restored. + */ +unsigned long long osnoise_get_runtime(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + long long runtime_us; + char *runtime_path; + int retval; + + if (context->runtime_us != OSNOISE_TIME_INIT_VAL) + return context->runtime_us; + + if (context->orig_runtime_us != OSNOISE_TIME_INIT_VAL) + return context->orig_runtime_us; + + runtime_path = tracefs_get_tracing_file("osnoise/runtime_us"); + + context->runtime_fd = open(runtime_path, O_RDWR); + if (context->runtime_fd < 0) + goto out_err; + + retval = read(context->runtime_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + runtime_us = get_llong_from_str(buffer); + if (runtime_us < 0) + goto out_close; + + tracefs_put_tracing_file(runtime_path); + + context->orig_runtime_us = runtime_us; + return runtime_us; + +out_close: + close(context->runtime_fd); + context->runtime_fd = CLOSED_FD; +out_err: + tracefs_put_tracing_file(runtime_path); + return 0; +} + +/* + * osnoise_get_period - return the original "osnoise/period_us" value + * + * It also saves the value to be restored. + */ +unsigned long long osnoise_get_period(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + char *period_path; + long long period_us; + int retval; + + if (context->period_us != OSNOISE_TIME_INIT_VAL) + return context->period_us; + + if (context->orig_period_us != OSNOISE_TIME_INIT_VAL) + return context->orig_period_us; + + period_path = tracefs_get_tracing_file("osnoise/period_us"); + + context->period_fd = open(period_path, O_RDWR); + if (context->period_fd < 0) + goto out_err; + + retval = read(context->period_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + period_us = get_llong_from_str(buffer); + if (period_us < 0) + goto out_close; + + tracefs_put_tracing_file(period_path); + + context->orig_period_us = period_us; + return period_us; + +out_close: + close(context->period_fd); + context->period_fd = CLOSED_FD; +out_err: + tracefs_put_tracing_file(period_path); + return 0; +} + +static int __osnoise_write_runtime(struct osnoise_context *context, + unsigned long long runtime) +{ + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (context->orig_runtime_us == OSNOISE_TIME_INIT_VAL) + return -1; + + snprintf(buffer, sizeof(buffer), "%llu\n", runtime); + + retval = write(context->runtime_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + return -1; + + context->runtime_us = runtime; + return 0; +} + +static int __osnoise_write_period(struct osnoise_context *context, + unsigned long long period) +{ + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (context->orig_period_us == OSNOISE_TIME_INIT_VAL) + return -1; + + snprintf(buffer, sizeof(buffer), "%llu\n", period); + + retval = write(context->period_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + return -1; + + context->period_us = period; + return 0; +} + +/* + * osnoise_set_runtime_period - set osnoise runtime and period + * + * Osnoise's runtime and period are related as runtime <= period. + * Thus, this function saves the original values, and then tries + * to set the runtime and period if they are != 0. + */ +int osnoise_set_runtime_period(struct osnoise_context *context, + unsigned long long runtime, + unsigned long long period) +{ + unsigned long long curr_runtime_us; + unsigned long long curr_period_us; + int retval; + + if (!period && !runtime) + return 0; + + curr_runtime_us = osnoise_get_runtime(context); + curr_period_us = osnoise_get_period(context); + + /* error getting any value? */ + if (curr_period_us == -1 || curr_runtime_us == -1) + return -1; + + if (!period) { + if (runtime > curr_period_us) + return -1; + return __osnoise_write_runtime(context, runtime); + } else if (!runtime) { + if (period < curr_runtime_us) + return -1; + return __osnoise_write_period(context, period); + } + + if (runtime > curr_period_us) { + retval = __osnoise_write_period(context, period); + if (retval) + return -1; + retval = __osnoise_write_runtime(context, runtime); + if (retval) + return -1; + } else { + retval = __osnoise_write_runtime(context, runtime); + if (retval) + return -1; + retval = __osnoise_write_period(context, period); + if (retval) + return -1; + } + + return 0; +} + +/* + * osnoise_restore_runtime_period - restore the original runtime and period + */ +void osnoise_restore_runtime_period(struct osnoise_context *context) +{ + unsigned long long orig_runtime = context->orig_runtime_us; + unsigned long long orig_period = context->orig_period_us; + unsigned long long curr_runtime = context->runtime_us; + unsigned long long curr_period = context->period_us; + int retval; + + if ((orig_runtime == OSNOISE_TIME_INIT_VAL) && (orig_period == OSNOISE_TIME_INIT_VAL)) + return; + + if ((orig_period == curr_period) && (orig_runtime == curr_runtime)) + goto out_done; + + retval = osnoise_set_runtime_period(context, orig_runtime, orig_period); + if (retval) + err_msg("Could not restore original osnoise runtime/period\n"); + +out_done: + context->runtime_us = OSNOISE_TIME_INIT_VAL; + context->period_us = OSNOISE_TIME_INIT_VAL; +} + +/* + * osnoise_put_runtime_period - restore original values and cleanup data + */ +void osnoise_put_runtime_period(struct osnoise_context *context) +{ + osnoise_restore_runtime_period(context); + + if (context->orig_runtime_us != OSNOISE_TIME_INIT_VAL) { + close(context->runtime_fd); + context->runtime_fd = CLOSED_FD; + context->orig_runtime_us = OSNOISE_TIME_INIT_VAL; + } + + if (context->orig_period_us != OSNOISE_TIME_INIT_VAL) { + close(context->period_fd); + context->period_fd = CLOSED_FD; + context->orig_period_us = OSNOISE_TIME_INIT_VAL; + } +} + +/* + * osnoise_get_timerlat_period_us - read and save the original "timerlat_period_us" + */ +static long long +osnoise_get_timerlat_period_us(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + long long timerlat_period_us; + char *stop_path; + int retval; + + if (context->timerlat_period_us != OSNOISE_TIME_INIT_VAL) + return context->timerlat_period_us; + + if (context->orig_timerlat_period_us != OSNOISE_TIME_INIT_VAL) + return context->orig_timerlat_period_us; + + stop_path = tracefs_get_tracing_file("osnoise/timerlat_period_us"); + + context->timerlat_period_us_fd = open(stop_path, O_RDWR); + if (context->timerlat_period_us_fd < 0) + goto out_err; + + retval = read(context->timerlat_period_us_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + timerlat_period_us = get_llong_from_str(buffer); + if (timerlat_period_us < 0) + goto out_close; + + tracefs_put_tracing_file(stop_path); + + context->orig_timerlat_period_us = timerlat_period_us; + return timerlat_period_us; + +out_close: + close(context->timerlat_period_us_fd); + context->timerlat_period_us_fd = CLOSED_FD; +out_err: + tracefs_put_tracing_file(stop_path); + return -1; +} + +/* + * osnoise_set_timerlat_period_us - set "timerlat_period_us" + */ +int osnoise_set_timerlat_period_us(struct osnoise_context *context, long long timerlat_period_us) +{ + long long curr_timerlat_period_us = osnoise_get_timerlat_period_us(context); + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (curr_timerlat_period_us == OSNOISE_TIME_INIT_VAL) + return -1; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", timerlat_period_us); + + retval = write(context->timerlat_period_us_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + return -1; + + context->timerlat_period_us = timerlat_period_us; + + return 0; +} + +/* + * osnoise_restore_timerlat_period_us - restore "timerlat_period_us" + */ +void osnoise_restore_timerlat_period_us(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (context->orig_timerlat_period_us == OSNOISE_TIME_INIT_VAL) + return; + + if (context->orig_timerlat_period_us == context->timerlat_period_us) + goto out_done; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_timerlat_period_us); + + retval = write(context->timerlat_period_us_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + err_msg("Could not restore original osnoise timerlat_period_us\n"); + +out_done: + context->timerlat_period_us = OSNOISE_TIME_INIT_VAL; +} + +/* + * osnoise_put_timerlat_period_us - restore original values and cleanup data + */ +void osnoise_put_timerlat_period_us(struct osnoise_context *context) +{ + osnoise_restore_timerlat_period_us(context); + + if (context->orig_timerlat_period_us == OSNOISE_TIME_INIT_VAL) + return; + + close(context->timerlat_period_us_fd); + context->timerlat_period_us_fd = CLOSED_FD; + context->orig_timerlat_period_us = OSNOISE_TIME_INIT_VAL; +} + +/* + * osnoise_get_stop_us - read and save the original "stop_tracing_us" + */ +static long long +osnoise_get_stop_us(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + long long stop_us; + char *stop_path; + int retval; + + if (context->stop_us != OSNOISE_OPTION_INIT_VAL) + return context->stop_us; + + if (context->orig_stop_us != OSNOISE_OPTION_INIT_VAL) + return context->orig_stop_us; + + stop_path = tracefs_get_tracing_file("osnoise/stop_tracing_us"); + + context->stop_us_fd = open(stop_path, O_RDWR); + if (context->stop_us_fd < 0) + goto out_err; + + retval = read(context->stop_us_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + stop_us = get_llong_from_str(buffer); + if (stop_us < 0) + goto out_close; + + tracefs_put_tracing_file(stop_path); + + context->orig_stop_us = stop_us; + return stop_us; + +out_close: + close(context->stop_us_fd); + context->stop_us_fd = CLOSED_FD; +out_err: + tracefs_put_tracing_file(stop_path); + return -1; +} + +/* + * osnoise_set_stop_us - set "stop_tracing_us" + */ +int osnoise_set_stop_us(struct osnoise_context *context, long long stop_us) +{ + long long curr_stop_us = osnoise_get_stop_us(context); + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (curr_stop_us == OSNOISE_OPTION_INIT_VAL) + return -1; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", stop_us); + + retval = write(context->stop_us_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + return -1; + + context->stop_us = stop_us; + + return 0; +} + +/* + * osnoise_restore_stop_us - restore the original "stop_tracing_us" + */ +void osnoise_restore_stop_us(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (context->orig_stop_us == OSNOISE_OPTION_INIT_VAL) + return; + + if (context->orig_stop_us == context->stop_us) + goto out_done; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_stop_us); + + retval = write(context->stop_us_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + err_msg("Could not restore original osnoise stop_us\n"); + +out_done: + context->stop_us = OSNOISE_OPTION_INIT_VAL; +} + +/* + * osnoise_put_stop_us - restore original values and cleanup data + */ +void osnoise_put_stop_us(struct osnoise_context *context) +{ + osnoise_restore_stop_us(context); + + if (context->orig_stop_us == OSNOISE_OPTION_INIT_VAL) + return; + + close(context->stop_us_fd); + context->stop_us_fd = CLOSED_FD; + context->orig_stop_us = OSNOISE_OPTION_INIT_VAL; +} + +/* + * osnoise_get_stop_total_us - read and save the original "stop_tracing_total_us" + */ +static long long +osnoise_get_stop_total_us(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + long long stop_total_us; + char *stop_path; + int retval; + + if (context->stop_total_us != OSNOISE_OPTION_INIT_VAL) + return context->stop_total_us; + + if (context->orig_stop_total_us != OSNOISE_OPTION_INIT_VAL) + return context->orig_stop_total_us; + + stop_path = tracefs_get_tracing_file("osnoise/stop_tracing_total_us"); + + context->stop_total_us_fd = open(stop_path, O_RDWR); + if (context->stop_total_us_fd < 0) + goto out_err; + + retval = read(context->stop_total_us_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + stop_total_us = get_llong_from_str(buffer); + if (stop_total_us < 0) + goto out_close; + + tracefs_put_tracing_file(stop_path); + + context->orig_stop_total_us = stop_total_us; + return stop_total_us; + +out_close: + close(context->stop_total_us_fd); + context->stop_total_us_fd = CLOSED_FD; +out_err: + tracefs_put_tracing_file(stop_path); + return -1; +} + +/* + * osnoise_set_stop_total_us - set "stop_tracing_total_us" + */ +int osnoise_set_stop_total_us(struct osnoise_context *context, long long stop_total_us) +{ + long long curr_stop_total_us = osnoise_get_stop_total_us(context); + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (curr_stop_total_us == OSNOISE_OPTION_INIT_VAL) + return -1; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", stop_total_us); + + retval = write(context->stop_total_us_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + return -1; + + context->stop_total_us = stop_total_us; + + return 0; +} + +/* + * osnoise_restore_stop_total_us - restore the original "stop_tracing_total_us" + */ +void osnoise_restore_stop_total_us(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (context->orig_stop_total_us == OSNOISE_OPTION_INIT_VAL) + return; + + if (context->orig_stop_total_us == context->stop_total_us) + goto out_done; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_stop_total_us); + + retval = write(context->stop_total_us_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + err_msg("Could not restore original osnoise stop_total_us\n"); + +out_done: + context->stop_total_us = OSNOISE_OPTION_INIT_VAL; +} + +/* + * osnoise_put_stop_total_us - restore original values and cleanup data + */ +void osnoise_put_stop_total_us(struct osnoise_context *context) +{ + osnoise_restore_stop_total_us(context); + + if (context->orig_stop_total_us == OSNOISE_OPTION_INIT_VAL) + return; + + close(context->stop_total_us_fd); + context->stop_total_us_fd = CLOSED_FD; + context->orig_stop_total_us = OSNOISE_OPTION_INIT_VAL; +} + +/* + * osnoise_get_print_stack - read and save the original "print_stack" + */ +static long long +osnoise_get_print_stack(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + long long print_stack; + char *stop_path; + int retval; + + if (context->print_stack != OSNOISE_OPTION_INIT_VAL) + return context->print_stack; + + if (context->orig_print_stack != OSNOISE_OPTION_INIT_VAL) + return context->orig_print_stack; + + stop_path = tracefs_get_tracing_file("osnoise/print_stack"); + + context->print_stack_fd = open(stop_path, O_RDWR); + if (context->print_stack_fd < 0) + goto out_err; + + retval = read(context->print_stack_fd, &buffer, sizeof(buffer)); + if (retval <= 0) + goto out_close; + + print_stack = get_llong_from_str(buffer); + if (print_stack < 0) + goto out_close; + + tracefs_put_tracing_file(stop_path); + + context->orig_print_stack = print_stack; + return print_stack; + +out_close: + close(context->print_stack_fd); + context->print_stack_fd = CLOSED_FD; +out_err: + tracefs_put_tracing_file(stop_path); + return -1; +} + +/* + * osnoise_set_print_stack - set "print_stack" + */ +int osnoise_set_print_stack(struct osnoise_context *context, long long print_stack) +{ + long long curr_print_stack = osnoise_get_print_stack(context); + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (curr_print_stack == OSNOISE_OPTION_INIT_VAL) + return -1; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", print_stack); + + retval = write(context->print_stack_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + return -1; + + context->print_stack = print_stack; + + return 0; +} + +/* + * osnoise_restore_print_stack - restore the original "print_stack" + */ +void osnoise_restore_print_stack(struct osnoise_context *context) +{ + char buffer[BUFF_U64_STR_SIZE]; + int retval; + + if (context->orig_print_stack == OSNOISE_OPTION_INIT_VAL) + return; + + if (context->orig_print_stack == context->print_stack) + goto out_done; + + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_print_stack); + + retval = write(context->print_stack_fd, buffer, strlen(buffer) + 1); + if (retval < (strlen(buffer) + 1)) + err_msg("Could not restore original osnoise print_stack\n"); + +out_done: + context->print_stack = OSNOISE_OPTION_INIT_VAL; +} + +/* + * osnoise_put_print_stack - restore original values and cleanup data + */ +void osnoise_put_print_stack(struct osnoise_context *context) +{ + osnoise_restore_print_stack(context); + + if (context->orig_print_stack == OSNOISE_OPTION_INIT_VAL) + return; + + close(context->print_stack_fd); + context->print_stack_fd = CLOSED_FD; + context->orig_print_stack = OSNOISE_OPTION_INIT_VAL; +} + +/* + * enable_osnoise - enable osnoise tracer in the trace_instance + */ +int enable_osnoise(struct trace_instance *trace) +{ + return enable_tracer_by_name(trace->inst, "osnoise"); +} + +/* + * enable_timerlat - enable timerlat tracer in the trace_instance + */ +int enable_timerlat(struct trace_instance *trace) +{ + return enable_tracer_by_name(trace->inst, "timerlat"); +} + +enum { + FLAG_CONTEXT_NEWLY_CREATED = (1 << 0), + FLAG_CONTEXT_DELETED = (1 << 1), +}; + +/* + * osnoise_get_context - increase the usage of a context and return it + */ +int osnoise_get_context(struct osnoise_context *context) +{ + int ret; + + if (context->flags & FLAG_CONTEXT_DELETED) { + ret = -1; + } else { + context->ref++; + ret = 0; + } + + return ret; +} + +/* + * osnoise_context_alloc - alloc an osnoise_context + * + * The osnoise context contains the information of the "osnoise/" configs. + * It is used to set and restore the config. + */ +struct osnoise_context *osnoise_context_alloc(void) +{ + struct osnoise_context *context; + + context = calloc(1, sizeof(*context)); + if (!context) + goto out_err; + + context->cpus_fd = CLOSED_FD; + context->runtime_fd = CLOSED_FD; + context->period_fd = CLOSED_FD; + context->stop_us_fd = CLOSED_FD; + context->stop_total_us_fd = CLOSED_FD; + context->timerlat_period_us_fd = CLOSED_FD; + context->print_stack_fd = CLOSED_FD; + + context->orig_stop_us = OSNOISE_OPTION_INIT_VAL; + context->stop_us = OSNOISE_OPTION_INIT_VAL; + + context->orig_stop_total_us = OSNOISE_OPTION_INIT_VAL; + context->stop_total_us = OSNOISE_OPTION_INIT_VAL; + + context->orig_print_stack = OSNOISE_OPTION_INIT_VAL; + context->print_stack = OSNOISE_OPTION_INIT_VAL; + + osnoise_get_context(context); + + return context; +out_err: + if (context) + free(context); + return NULL; +} + +/* + * osnoise_put_context - put the osnoise_put_context + * + * If there is no other user for the context, the original data + * is restored. + */ +void osnoise_put_context(struct osnoise_context *context) +{ + if (--context->ref < 1) + context->flags |= FLAG_CONTEXT_DELETED; + + if (!(context->flags & FLAG_CONTEXT_DELETED)) + return; + + osnoise_put_cpus(context); + osnoise_put_runtime_period(context); + osnoise_put_stop_us(context); + osnoise_put_stop_total_us(context); + osnoise_put_timerlat_period_us(context); + osnoise_put_print_stack(context); + + free(context); +} + +/* + * osnoise_destroy_tool - disable trace, restore configs and free data + */ +void osnoise_destroy_tool(struct osnoise_tool *top) +{ + trace_instance_destroy(&top->trace); + + if (top->context) + osnoise_put_context(top->context); + + free(top); +} + +/* + * osnoise_init_tool - init an osnoise tool + * + * It allocs data, create a context to store data and + * creates a new trace instance for the tool. + */ +struct osnoise_tool *osnoise_init_tool(char *tool_name) +{ + struct osnoise_tool *top; + int retval; + + top = calloc(1, sizeof(*top)); + if (!top) + return NULL; + + top->context = osnoise_context_alloc(); + if (!top->context) + goto out_err; + + retval = trace_instance_init(&top->trace, tool_name); + if (retval) + goto out_err; + + return top; +out_err: + osnoise_destroy_tool(top); + return NULL; +} + +/* + * osnoise_init_trace_tool - init a tracer instance to trace osnoise events + */ +struct osnoise_tool *osnoise_init_trace_tool(char *tracer) +{ + struct osnoise_tool *trace; + int retval; + + trace = osnoise_init_tool("osnoise_trace"); + if (!trace) + return NULL; + + retval = tracefs_event_enable(trace->trace.inst, "osnoise", NULL); + if (retval < 0 && !errno) { + err_msg("Could not find osnoise events\n"); + goto out_err; + } + + retval = enable_tracer_by_name(trace->trace.inst, tracer); + if (retval) { + err_msg("Could not enable osnoiser tracer for tracing\n"); + goto out_err; + } + + return trace; +out_err: + osnoise_destroy_tool(trace); + return NULL; +} + +static void osnoise_usage(void) +{ + int i; + + static const char *msg[] = { + "", + "osnoise version " VERSION, + "", + " usage: [rtla] osnoise [MODE] ...", + "", + " modes:", + " top - prints the summary from osnoise tracer", + "", + "if no MODE is given, the top mode is called, passing the arguments", + NULL, + }; + + for (i = 0; msg[i]; i++) + fprintf(stderr, "%s\n", msg[i]); + exit(1); +} + +int osnoise_main(int argc, char *argv[]) +{ + if (argc == 0) + goto usage; + + /* + * if osnoise was called without any argument, run the + * default cmdline. + */ + if (argc == 1) { + osnoise_top_main(argc, argv); + exit(0); + } + + if ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0)) { + osnoise_usage(); + exit(0); + } else if (strncmp(argv[1], "-", 1) == 0) { + /* the user skipped the tool, call the default one */ + osnoise_top_main(argc, argv); + exit(0); + } else if (strcmp(argv[1], "top") == 0) { + osnoise_top_main(argc-1, &argv[1]); + exit(0); + } + +usage: + osnoise_usage(); + exit(1); +} diff --git a/tools/tracing/rtla/src/osnoise.h b/tools/tracing/rtla/src/osnoise.h new file mode 100644 index 000000000000..e3e8f8359d99 --- /dev/null +++ b/tools/tracing/rtla/src/osnoise.h @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "trace.h" + +/* + * osnoise_context - read, store, write, restore osnoise configs. + */ +struct osnoise_context { + int flags; + int ref; + + int cpus_fd; + int runtime_fd; + int period_fd; + int stop_us_fd; + int stop_total_us_fd; + int timerlat_period_us_fd; + int print_stack_fd; + + char *curr_cpus; + char *orig_cpus; + + /* 0 as init value */ + unsigned long long orig_runtime_us; + unsigned long long runtime_us; + + /* 0 as init value */ + unsigned long long orig_period_us; + unsigned long long period_us; + + /* 0 as init value */ + long long orig_timerlat_period_us; + long long timerlat_period_us; + + /* -1 as init value because 0 is disabled */ + long long orig_stop_us; + long long stop_us; + + /* -1 as init value because 0 is disabled */ + long long orig_stop_total_us; + long long stop_total_us; + + /* -1 as init value because 0 is disabled */ + long long orig_print_stack; + long long print_stack; +}; + +#define CLOSED_FD (-1) +#define OSNOISE_OPTION_INIT_VAL (-1) +#define OSNOISE_TIME_INIT_VAL (0) + +struct osnoise_context *osnoise_context_alloc(void); +int osnoise_get_context(struct osnoise_context *context); +void osnoise_put_context(struct osnoise_context *context); + +int osnoise_set_cpus(struct osnoise_context *context, char *cpus); +void osnoise_restore_cpus(struct osnoise_context *context); + +int osnoise_set_runtime_period(struct osnoise_context *context, + unsigned long long runtime, + unsigned long long period); +void osnoise_restore_runtime_period(struct osnoise_context *context); + +int osnoise_set_stop_us(struct osnoise_context *context, + long long stop_us); +void osnoise_restore_stop_us(struct osnoise_context *context); + +int osnoise_set_stop_total_us(struct osnoise_context *context, + long long stop_total_us); +void osnoise_restore_stop_total_us(struct osnoise_context *context); + +int osnoise_set_timerlat_period_us(struct osnoise_context *context, + long long timerlat_period_us); +void osnoise_restore_timerlat_period_us(struct osnoise_context *context); + +void osnoise_restore_print_stack(struct osnoise_context *context); +int osnoise_set_print_stack(struct osnoise_context *context, + long long print_stack); + +/* + * osnoise_tool - osnoise based tool definition. + */ +struct osnoise_tool { + struct trace_instance trace; + struct osnoise_context *context; + void *data; + void *params; + time_t start_time; +}; + +void osnoise_destroy_tool(struct osnoise_tool *top); +struct osnoise_tool *osnoise_init_tool(char *tool_name); +struct osnoise_tool *osnoise_init_trace_tool(char *tracer); + +int osnoise_top_main(int argc, char **argv); +int osnoise_main(int argc, char **argv); diff --git a/tools/tracing/rtla/src/rtla.c b/tools/tracing/rtla/src/rtla.c index 5ae2664ed47d..669b9750b3b3 100644 --- a/tools/tracing/rtla/src/rtla.c +++ b/tools/tracing/rtla/src/rtla.c @@ -8,6 +8,8 @@ #include #include +#include "osnoise.h" + /* * rtla_usage - print rtla usage */ @@ -22,6 +24,7 @@ static void rtla_usage(void) " usage: rtla COMMAND ...", "", " commands:", + " osnoise - gives information about the operating system noise (osnoise)", "", NULL, }; @@ -39,7 +42,14 @@ static void rtla_usage(void) */ int run_command(int argc, char **argv, int start_position) { + if (strcmp(argv[start_position], "osnoise") == 0) { + osnoise_main(argc-start_position, &argv[start_position]); + goto ran; + } + return 0; +ran: + return 1; } int main(int argc, char *argv[])