From patchwork Wed Jun 1 10:39:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 69015 Delivered-To: patch@linaro.org Received: by 10.140.92.199 with SMTP id b65csp16828qge; Wed, 1 Jun 2016 03:40:09 -0700 (PDT) X-Received: by 10.98.12.143 with SMTP id 15mr7311303pfm.12.1464777608755; Wed, 01 Jun 2016 03:40:08 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id c2si24497631pas.175.2016.06.01.03.40.08; Wed, 01 Jun 2016 03:40:08 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755316AbcFAKkF (ORCPT + 30 others); Wed, 1 Jun 2016 06:40:05 -0400 Received: from mail-pf0-f172.google.com ([209.85.192.172]:35994 "EHLO mail-pf0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751423AbcFAKkD (ORCPT ); Wed, 1 Jun 2016 06:40:03 -0400 Received: by mail-pf0-f172.google.com with SMTP id f144so12979490pfa.3 for ; Wed, 01 Jun 2016 03:40:02 -0700 (PDT) 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 :in-reply-to:references; bh=JIgLOUWtFPfVIUt3EsaVqCzOPisxtCJDSb13ZQsTgKI=; b=G8Dts4kZu+t7cSKuJU15WTg2rkO5ILZcrqYvkqh13kNZ8gsp/x9SmeFAWrgUtRojE4 RtEm+hpRHuv/rwPwXJlvBx3px3qdhMgE/3E5GutT8zXc+VZWs61uNeuamBKeumsg5sWZ HJHdsVryv7H2PvediBHy2Bi6Yi/3BXrenrqTk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=JIgLOUWtFPfVIUt3EsaVqCzOPisxtCJDSb13ZQsTgKI=; b=e5wuavN+I1fG+uhjC81xA19GXE+sdsDyBR6Jd6pHTACVHSnW6kPP6AnpHLk+jb0kS9 GTA4hRucsq+ILJ3ZD7L3HHdLGc3N/K+umA9+0W6d5EFZ2Kgo9EB9cJSsvgcXXJkGDjMp nrQjE41XfZ4c9UBPP19S5f3mJSekzWiPB9Lb2UiWaduMsbExbaTq49CMOWxkAlKt+4WQ 4VKY4BLJGXbnfxOjgfHKJqnTAS2i50Ka2JaCdBISRPcx59x58gyamijxzfyd2tt223Cw WmKGMS3V/IWqTiTWC4SXX/kOKOrmd6YrLb0QvZd0sJm3qJBllKQuC8zPV27vl4p2s8Jl a4Xw== X-Gm-Message-State: ALyK8tJTZX0dvYXi9wrz4OvjGBVIOy5uXS/SPMwvHDYv4PiGbrOCl+EigXATur1jkQ7dddX+ X-Received: by 10.98.86.151 with SMTP id h23mr7375581pfj.16.1464777602247; Wed, 01 Jun 2016 03:40:02 -0700 (PDT) Received: from localhost ([122.167.174.248]) by smtp.gmail.com with ESMTPSA id a62sm47058230pfj.29.2016.06.01.03.40.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Jun 2016 03:40:01 -0700 (PDT) From: Viresh Kumar To: Rafael Wysocki , Viresh Kumar Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, smuckle@linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH V2 1/2] cpufreq: Store sorted frequency table Date: Wed, 1 Jun 2016 16:09:54 +0530 Message-Id: <8094732e9276cd108a40e0e88643e408257d030c.1464777376.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.7.1.410.g6faf27b In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The drivers aren't required to provide a sorted frequency table today, and its not optimal to work on an unsorted freq table. To simplify and improve code performance, create a frequency table within core and keep it sorted in ascending order. Note that this should eventually replace policy->freq_table itself, which isn't done currently as few drivers will break due to that. Signed-off-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 23 ++++++++++----- drivers/cpufreq/freq_table.c | 67 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/cpufreq.h | 3 ++ 3 files changed, 86 insertions(+), 7 deletions(-) -- 2.7.1.410.g6faf27b diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 07c933c6c29a..799e03daa4a3 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1137,6 +1137,16 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify) kfree(policy); } +static void cpufreq_policy_exit(struct cpufreq_policy *policy) +{ + if (!cpufreq_driver->exit) + return; + + cpufreq_driver->exit(policy); + free_sorted_freq_table(policy); + policy->freq_table = NULL; +} + static int cpufreq_online(unsigned int cpu) { struct cpufreq_policy *policy; @@ -1178,6 +1188,10 @@ static int cpufreq_online(unsigned int cpu) goto out_free_policy; } + ret = create_sorted_freq_table(policy); + if (ret) + goto out_exit_policy; + down_write(&policy->rwsem); if (new_policy) { @@ -1291,9 +1305,7 @@ static int cpufreq_online(unsigned int cpu) out_exit_policy: up_write(&policy->rwsem); - - if (cpufreq_driver->exit) - cpufreq_driver->exit(policy); + cpufreq_policy_exit(policy); out_free_policy: cpufreq_policy_free(policy, !new_policy); return ret; @@ -1378,10 +1390,7 @@ static void cpufreq_offline(unsigned int cpu) * since this is a core component, and is essential for the * subsequent light-weight ->init() to succeed. */ - if (cpufreq_driver->exit) { - cpufreq_driver->exit(policy); - policy->freq_table = NULL; - } + cpufreq_policy_exit(policy); unlock: up_write(&policy->rwsem); diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c index eac8bcbdaad1..d536136c8e1f 100644 --- a/drivers/cpufreq/freq_table.c +++ b/drivers/cpufreq/freq_table.c @@ -13,6 +13,7 @@ #include #include +#include /********************************************************************* * FREQUENCY TABLE HELPERS * @@ -297,6 +298,72 @@ struct freq_attr *cpufreq_generic_attr[] = { }; EXPORT_SYMBOL_GPL(cpufreq_generic_attr); +static int next_larger(struct cpufreq_policy *policy, unsigned int freq, + struct cpufreq_frequency_table *table) +{ + struct cpufreq_frequency_table *pos; + unsigned int next_freq = ~0; + int index = -EINVAL; + + cpufreq_for_each_valid_entry(pos, table) { + if (pos->frequency <= freq) + continue; + + if (next_freq > pos->frequency) { + next_freq = pos->frequency; + index = pos - table; + } + } + + return index; +} + +void free_sorted_freq_table(struct cpufreq_policy *policy) +{ + kfree(policy->sorted_freq_table); + policy->sorted_freq_table = NULL; +} + +int create_sorted_freq_table(struct cpufreq_policy *policy) +{ + struct cpufreq_frequency_table *pos, *new_table; + unsigned int freq, index, i, count = 0; + struct cpufreq_frequency_table *table = policy->freq_table; + + if (!table) + return 0; + + cpufreq_for_each_valid_entry(pos, table) + count++; + + /* Extra entry for CPUFREQ_TABLE_END */ + count++; + + new_table = kmalloc_array(count, sizeof(*new_table), GFP_KERNEL); + if (!new_table) + return -ENOMEM; + + for (i = 0, freq = 0; i < count - 1; i++) { + index = next_larger(policy, freq, table); + if (index == -EINVAL) + break; + + /* + * driver_data of the sorted table points to the index of the + * unsorted table. + */ + new_table[i].driver_data = index; + new_table[i].frequency = table[index].frequency; + + freq = table[index].frequency; + } + + new_table[i].frequency = CPUFREQ_TABLE_END; + policy->sorted_freq_table = new_table; + + return 0; +} + int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, struct cpufreq_frequency_table *table) { diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index c378776628b4..5e23eed2252c 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -87,6 +87,7 @@ struct cpufreq_policy { struct cpufreq_user_policy user_policy; struct cpufreq_frequency_table *freq_table; + struct cpufreq_frequency_table *sorted_freq_table; struct list_head policy_list; struct kobject kobj; @@ -592,6 +593,8 @@ static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, struct cpufreq_frequency_table *table); +int create_sorted_freq_table(struct cpufreq_policy *policy); +void free_sorted_freq_table(struct cpufreq_policy *policy); int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, struct cpufreq_frequency_table *table);