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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4385FC432C3 for ; Tue, 9 Mar 2021 22:43:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 240F3650E0 for ; Tue, 9 Mar 2021 22:43:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232250AbhCIWnI (ORCPT ); Tue, 9 Mar 2021 17:43:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232183AbhCIWm5 (ORCPT ); Tue, 9 Mar 2021 17:42:57 -0500 Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 20F02C06174A for ; Tue, 9 Mar 2021 14:42:57 -0800 (PST) Received: by mail-wr1-x429.google.com with SMTP id a18so19056878wrc.13 for ; Tue, 09 Mar 2021 14:42:57 -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:in-reply-to:references; bh=tGAdxc5Fb2RB7pZV+JmXUvhQNnyRCNFzDkDAeSmuI2Q=; b=Yc6adA4N+tb+x2vpiGhn1J782snwlw5R67Gk+c9o1wox5wrhTXSv5EskUu8VbG73n/ DS/9hlp3vyY7cMDV29tK0JPv5/PvYKPW1tLW2Lb9ZiPNAcFtyPSyOwvli0/jpF1Itfre ddys+RDsYS6w0hyeugfBUeB+9xNkobojrs9Dp2simq+1PqGy35w3SxdnRY38ZYjQBEKj Z0YhgURp5EHO0it48kKLV36JojS0BSAt6C27kG/YjTW/uOtZkFbp+Zb1kLr4br64+ZFy yfsc+Da+Z9pI1fOB3pvgQPY9ioKHN8ElqAPjxxd/sHxOMW/rYBs190GY4E9uhh0+TaVX dKLQ== 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:in-reply-to :references; bh=tGAdxc5Fb2RB7pZV+JmXUvhQNnyRCNFzDkDAeSmuI2Q=; b=pYXliYyKO+/hHhbaIanIK5LyZV+PpCYVlbUgYT/hhW3YD1klMmXg7uXxH4ViVr6HRA tbj53Kcuhe+uaQyzmOa4dSoDaDHHYH7pbu3C4iehst/hb+nfbsbzhN+BCyM7czcnlmzE u4Oxydr42wH9zuDDdqq5K6ic0i6LoB2TWCR1IA7HZoV27vzRUmufWig2AO2jBqEECTbN yJsgL+qinxTqMCN/k8ibjIK+k4babU/CD8J8YSiyrpfexyLYlh5dkC+cZ9Efm+2BnLzh 7M4am44s0fAmtjOF5OkN4GTOonw4wpUJmnqJ9aDCToApu9lPdVBQKXnYZRe3jJdXsX/+ shlg== X-Gm-Message-State: AOAM530Fei+aEiVryBuZH4cg+H/ont4XJyHHGs8Z0zNL+gAP61pt+Sb0 1S/Lx/ZDJMzc6sVurKVD+40wrA== X-Google-Smtp-Source: ABdhPJw6J3vsrBUZpCppx55KTe5EMXcTphACjBga1rzZ8XDl2CTRGa5xeum9o3IsZm+VcrAQSqA4/g== X-Received: by 2002:a5d:4523:: with SMTP id j3mr156110wra.288.1615329775748; Tue, 09 Mar 2021 14:42:55 -0800 (PST) Received: from localhost.localdomain ([82.142.0.212]) by smtp.gmail.com with ESMTPSA id p16sm30352179wrt.54.2021.03.09.14.42.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Mar 2021 14:42:55 -0800 (PST) From: Daniel Lezcano To: daniel.lezcano@linaro.org, rafael@kernel.org Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, lukasz.luba@arm.com Subject: [PATCH v2 4/5] powercap/drivers/dtpm: Use container_of instead of a private data field Date: Tue, 9 Mar 2021 23:42:43 +0100 Message-Id: <20210309224244.27225-4-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210309224244.27225-1-daniel.lezcano@linaro.org> References: <20210309224244.27225-1-daniel.lezcano@linaro.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The dtpm framework provides an API to allocate a dtpm node. However when a backend dtpm driver needs to allocate a dtpm node it must define its own structure and store the pointer of this structure in the private field of the dtpm structure. It is more elegant to use the container_of macro and add the dtpm structure inside the dtpm backend specific structure. The code will be able to deal properly with the dtpm structure as a generic entity, making all this even more self-encapsulated. The dtpm_alloc() function does no longer make sense as the dtpm structure will be allocated when allocating the device specific dtpm structure. The dtpm_init() is provided instead. Signed-off-by: Daniel Lezcano Reviewed-by: Lukasz Luba --- drivers/powercap/dtpm.c | 27 ++++++++++------------ drivers/powercap/dtpm_cpu.c | 46 ++++++++++++++++++------------------- include/linux/dtpm.h | 3 +-- 3 files changed, 35 insertions(+), 41 deletions(-) diff --git a/drivers/powercap/dtpm.c b/drivers/powercap/dtpm.c index 74d9603bd42a..a4784ac2f79b 100644 --- a/drivers/powercap/dtpm.c +++ b/drivers/powercap/dtpm.c @@ -191,10 +191,13 @@ struct dtpm *dtpm_get(const char *name) mutex_lock(&dtpm_lock); dtpm = __dtpm_lookup(name); - if (!dtpm) - dtpm = dtpm_alloc(NULL); - else + if (!dtpm) { + dtpm = kzalloc(sizeof(*dtpm), GFP_KERNEL); + if (dtpm) + dtpm_init(dtpm, NULL); + } else { kref_get(&dtpm->kref); + } mutex_unlock(&dtpm_lock); return dtpm; @@ -498,16 +501,12 @@ static struct powercap_zone_ops zone_ops = { }; /** - * dtpm_alloc - Allocate and initialize a dtpm struct - * @name: a string specifying the name of the node - * - * Return: a struct dtpm pointer, NULL in case of error + * dtpm_init - Allocate and initialize a dtpm struct + * @dtpm: The dtpm struct pointer to be initialized + * @ops: The dtpm device specific ops, NULL for a virtual node */ -struct dtpm *dtpm_alloc(struct dtpm_ops *ops) +void dtpm_init(struct dtpm *dtpm, struct dtpm_ops *ops) { - struct dtpm *dtpm; - - dtpm = kzalloc(sizeof(*dtpm), GFP_KERNEL); if (dtpm) { INIT_LIST_HEAD(&dtpm->children); INIT_LIST_HEAD(&dtpm->sibling); @@ -515,8 +514,6 @@ struct dtpm *dtpm_alloc(struct dtpm_ops *ops) dtpm->weight = 1024; dtpm->ops = ops; } - - return dtpm; } /** @@ -608,7 +605,7 @@ int dtpm_create(const char *name, struct dtpm *dtpm, struct dtpm *parent) return 0; } -static int __init dtpm_init(void) +static int __init init_dtpm(void) { struct dtpm_descr *dtpm_descr; @@ -623,4 +620,4 @@ static int __init dtpm_init(void) return 0; } -late_initcall(dtpm_init); +late_initcall(init_dtpm); diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c index 983f1ca27dc3..ac7f2e7e262f 100644 --- a/drivers/powercap/dtpm_cpu.c +++ b/drivers/powercap/dtpm_cpu.c @@ -25,16 +25,22 @@ #include #include -static DEFINE_PER_CPU(struct dtpm *, dtpm_per_cpu); - struct dtpm_cpu { + struct dtpm dtpm; struct freq_qos_request qos_req; int cpu; }; +static DEFINE_PER_CPU(struct dtpm_cpu *, dtpm_per_cpu); + +static struct dtpm_cpu *to_dtpm_cpu(struct dtpm *dtpm) +{ + return container_of(dtpm, struct dtpm_cpu, dtpm); +} + static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) { - struct dtpm_cpu *dtpm_cpu = dtpm->private; + struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); struct em_perf_domain *pd = em_cpu_get(dtpm_cpu->cpu); struct cpumask cpus; unsigned long freq; @@ -64,7 +70,7 @@ static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) static u64 get_pd_power_uw(struct dtpm *dtpm) { - struct dtpm_cpu *dtpm_cpu = dtpm->private; + struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); struct em_perf_domain *pd; struct cpumask cpus; unsigned long freq; @@ -90,7 +96,7 @@ static u64 get_pd_power_uw(struct dtpm *dtpm) static int update_pd_power_uw(struct dtpm *dtpm) { - struct dtpm_cpu *dtpm_cpu = dtpm->private; + struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); struct em_perf_domain *em = em_cpu_get(dtpm_cpu->cpu); struct cpumask cpus; int nr_cpus; @@ -111,7 +117,7 @@ static int update_pd_power_uw(struct dtpm *dtpm) static void pd_release(struct dtpm *dtpm) { - struct dtpm_cpu *dtpm_cpu = dtpm->private; + struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); if (freq_qos_request_active(&dtpm_cpu->qos_req)) freq_qos_remove_request(&dtpm_cpu->qos_req); @@ -129,20 +135,19 @@ static struct dtpm_ops dtpm_ops = { static int cpuhp_dtpm_cpu_offline(unsigned int cpu) { struct em_perf_domain *pd; - struct dtpm *dtpm; + struct dtpm_cpu *dtpm_cpu; pd = em_cpu_get(cpu); if (!pd) return -EINVAL; - dtpm = per_cpu(dtpm_per_cpu, cpu); + dtpm_cpu = per_cpu(dtpm_per_cpu, cpu); - return dtpm_update_power(dtpm); + return dtpm_update_power(&dtpm_cpu->dtpm); } static int cpuhp_dtpm_cpu_online(unsigned int cpu) { - struct dtpm *dtpm; struct dtpm_cpu *dtpm_cpu; struct cpufreq_policy *policy; struct em_perf_domain *pd; @@ -157,27 +162,23 @@ static int cpuhp_dtpm_cpu_online(unsigned int cpu) if (!pd) return -EINVAL; - dtpm = per_cpu(dtpm_per_cpu, cpu); - if (dtpm) - return dtpm_update_power(dtpm); - - dtpm = dtpm_alloc(&dtpm_ops); - if (!dtpm) - return -EINVAL; + dtpm_cpu = per_cpu(dtpm_per_cpu, cpu); + if (dtpm_cpu) + return dtpm_update_power(&dtpm_cpu->dtpm); dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL); if (!dtpm_cpu) - goto out_kfree_dtpm; + return -ENOMEM; - dtpm->private = dtpm_cpu; + dtpm_init(&dtpm_cpu->dtpm, &dtpm_ops); dtpm_cpu->cpu = cpu; for_each_cpu(cpu, policy->related_cpus) - per_cpu(dtpm_per_cpu, cpu) = dtpm; + per_cpu(dtpm_per_cpu, cpu) = dtpm_cpu; sprintf(name, "cpu%d-cpufreq", dtpm_cpu->cpu); - ret = dtpm_register(name, dtpm); + ret = dtpm_register(name, &dtpm_cpu->dtpm); if (ret) goto out_kfree_dtpm_cpu; @@ -192,15 +193,12 @@ static int cpuhp_dtpm_cpu_online(unsigned int cpu) out_dtpm_unregister: dtpm_unregister(name); dtpm_cpu = NULL; - dtpm = NULL; out_kfree_dtpm_cpu: for_each_cpu(cpu, policy->related_cpus) per_cpu(dtpm_per_cpu, cpu) = NULL; kfree(dtpm_cpu); -out_kfree_dtpm: - kfree(dtpm); return ret; } diff --git a/include/linux/dtpm.h b/include/linux/dtpm.h index 5f71ddc18ee9..4f7ad21291e6 100644 --- a/include/linux/dtpm.h +++ b/include/linux/dtpm.h @@ -24,7 +24,6 @@ struct dtpm { u64 power_max; u64 power_min; int weight; - void *private; }; struct dtpm_ops { @@ -66,7 +65,7 @@ int dtpm_update_power(struct dtpm *dtpm); int dtpm_release_zone(struct powercap_zone *pcz); -struct dtpm *dtpm_alloc(struct dtpm_ops *ops); +void dtpm_init(struct dtpm *dtpm, struct dtpm_ops *ops); void dtpm_destroy(struct dtpm *dtpm); -- 2.17.1