From patchwork Fri Apr 8 08:45:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Fancellu X-Patchwork-Id: 12806302 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF071C433FE for ; Fri, 8 Apr 2022 08:45:51 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.301203.514011 (Exim 4.92) (envelope-from ) id 1nckFL-000113-3q; Fri, 08 Apr 2022 08:45:35 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 301203.514011; Fri, 08 Apr 2022 08:45:35 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nckFL-00010l-0V; Fri, 08 Apr 2022 08:45:35 +0000 Received: by outflank-mailman (input) for mailman id 301203; Fri, 08 Apr 2022 08:45:33 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nckFJ-0000Ej-Bw for xen-devel@lists.xenproject.org; Fri, 08 Apr 2022 08:45:33 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-sth1.inumbo.com (Halon) with ESMTP id 3fea7354-b718-11ec-a405-831a346695d4; Fri, 08 Apr 2022 10:45:32 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AF42C139F; Fri, 8 Apr 2022 01:45:31 -0700 (PDT) Received: from e125770.cambridge.arm.com (e125770.cambridge.arm.com [10.1.195.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6035F3F73B; Fri, 8 Apr 2022 01:45:30 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 3fea7354-b718-11ec-a405-831a346695d4 From: Luca Fancellu To: xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, wei.chen@arm.com, George Dunlap , Dario Faggioli , Andrew Cooper , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu Subject: [PATCH v6 3/6] xen/sched: retrieve scheduler id by name Date: Fri, 8 Apr 2022 09:45:14 +0100 Message-Id: <20220408084517.33082-4-luca.fancellu@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220408084517.33082-1-luca.fancellu@arm.com> References: <20220408084517.33082-1-luca.fancellu@arm.com> Add a static function to retrieve the scheduler pointer using the scheduler name. Add a public function to retrieve the scheduler id by the scheduler name that makes use of the new static function. Take the occasion to replace open coded scheduler search with the new static function in scheduler_init. Signed-off-by: Luca Fancellu Reviewed-by: Juergen Gross Reviewed-by: Dario Faggioli --- Changes in v6: - no changes Changes in v5: - no changes Changes in v4: - no changes Changes in v3: - add R-by Changes in v2: - replace open coded scheduler search in scheduler_init (Juergen) --- xen/common/sched/core.c | 40 ++++++++++++++++++++++++++-------------- xen/include/xen/sched.h | 11 +++++++++++ 2 files changed, 37 insertions(+), 14 deletions(-) diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c index 19ab67818106..48ee01420fb8 100644 --- a/xen/common/sched/core.c +++ b/xen/common/sched/core.c @@ -2947,10 +2947,30 @@ void scheduler_enable(void) scheduler_active = true; } +static inline +const struct scheduler *__init sched_get_by_name(const char *sched_name) +{ + unsigned int i; + + for ( i = 0; i < NUM_SCHEDULERS; i++ ) + if ( schedulers[i] && !strcmp(schedulers[i]->opt_name, sched_name) ) + return schedulers[i]; + + return NULL; +} + +int __init sched_get_id_by_name(const char *sched_name) +{ + const struct scheduler *scheduler = sched_get_by_name(sched_name); + + return scheduler ? scheduler->sched_id : -1; +} + /* Initialise the data structures. */ void __init scheduler_init(void) { struct domain *idle_domain; + const struct scheduler *scheduler; int i; scheduler_enable(); @@ -2981,25 +3001,17 @@ void __init scheduler_init(void) schedulers[i]->opt_name); schedulers[i] = NULL; } - - if ( schedulers[i] && !ops.name && - !strcmp(schedulers[i]->opt_name, opt_sched) ) - ops = *schedulers[i]; } - if ( !ops.name ) + scheduler = sched_get_by_name(opt_sched); + if ( !scheduler ) { printk("Could not find scheduler: %s\n", opt_sched); - for ( i = 0; i < NUM_SCHEDULERS; i++ ) - if ( schedulers[i] && - !strcmp(schedulers[i]->opt_name, CONFIG_SCHED_DEFAULT) ) - { - ops = *schedulers[i]; - break; - } - BUG_ON(!ops.name); - printk("Using '%s' (%s)\n", ops.name, ops.opt_name); + scheduler = sched_get_by_name(CONFIG_SCHED_DEFAULT); + BUG_ON(!scheduler); + printk("Using '%s' (%s)\n", scheduler->name, scheduler->opt_name); } + ops = *scheduler; if ( cpu_schedule_up(0) ) BUG(); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index b07717987434..b527f141a1d3 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -758,6 +758,17 @@ void sched_destroy_domain(struct domain *d); long sched_adjust(struct domain *, struct xen_domctl_scheduler_op *); long sched_adjust_global(struct xen_sysctl_scheduler_op *); int sched_id(void); + +/* + * sched_get_id_by_name - retrieves a scheduler id given a scheduler name + * @sched_name: scheduler name as a string + * + * returns: + * positive value being the scheduler id, on success + * negative value if the scheduler name is not found. + */ +int sched_get_id_by_name(const char *sched_name); + void vcpu_wake(struct vcpu *v); long vcpu_yield(void); void vcpu_sleep_nosync(struct vcpu *v);