From mboxrd@z Thu Jan 1 00:00:00 1970 From: Akshay Adiga Subject: [PATCH v2 1/2] cpufreq: powernv: Adding fast_switch for schedutil Date: Mon, 7 Nov 2016 13:09:08 +0530 Message-ID: <1478504349-14796-1-git-send-email-akshay.adiga@linux.vnet.ibm.com> Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:57774 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750922AbcKGHjZ (ORCPT ); Mon, 7 Nov 2016 02:39:25 -0500 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uA77d6bH118806 for ; Mon, 7 Nov 2016 02:39:24 -0500 Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) by mx0a-001b2d01.pphosted.com with ESMTP id 26jb2hma16-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 07 Nov 2016 02:39:24 -0500 Received: from localhost by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 7 Nov 2016 17:39:22 +1000 Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: rjw@rjwysocki.net, ego@linux.vnet.ibm.com, shilpa.bhat@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: Akshay Adiga Adding fast_switch which does light weight operation to set the desired pstate. Both global and local pstates are set to the same desired pstate. Signed-off-by: Akshay Adiga --- Changes from v1 : - Removed unnecessary check for index out of bound. drivers/cpufreq/powernv-cpufreq.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index d3ffde8..4a4380d 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -752,9 +752,12 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy) spin_lock_init(&gpstates->gpstate_lock); ret = cpufreq_table_validate_and_show(policy, powernv_freqs); - if (ret < 0) + if (ret < 0) { kfree(policy->driver_data); + return ret; + } + policy->fast_switch_possible = true; return ret; } @@ -897,6 +900,20 @@ static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy) del_timer_sync(&gpstates->timer); } +static unsigned int powernv_fast_switch(struct cpufreq_policy *policy, + unsigned int target_freq) +{ + int index; + struct powernv_smp_call_data freq_data; + + index = cpufreq_table_find_index_dl(policy, target_freq); + freq_data.pstate_id = powernv_freqs[index].driver_data; + freq_data.gpstate_id = powernv_freqs[index].driver_data; + set_pstate(&freq_data); + + return powernv_freqs[index].frequency; +} + static struct cpufreq_driver powernv_cpufreq_driver = { .name = "powernv-cpufreq", .flags = CPUFREQ_CONST_LOOPS, @@ -904,6 +921,7 @@ static struct cpufreq_driver powernv_cpufreq_driver = { .exit = powernv_cpufreq_cpu_exit, .verify = cpufreq_generic_frequency_table_verify, .target_index = powernv_cpufreq_target_index, + .fast_switch = powernv_fast_switch, .get = powernv_cpufreq_get, .stop_cpu = powernv_cpufreq_stop_cpu, .attr = powernv_cpu_freq_attr, -- 2.5.5