Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752701AbbGMOLf (ORCPT ); Mon, 13 Jul 2015 10:11:35 -0400 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:54329 "EHLO e23smtp03.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752641AbbGMOLb (ORCPT ); Mon, 13 Jul 2015 10:11:31 -0400 X-Helo: d23dlp02.au.ibm.com X-MailFrom: shilpa.bhat@linux.vnet.ibm.com X-RcptTo: linux-pm@vger.kernel.org From: Shilpasri G Bhat To: rjw@rjwysocki.net Cc: viresh.kumar@linaro.org, linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Shilpasri G Bhat Subject: [PATCH v4 6/6] cpufreq: powernv: Restore cpu frequency to policy->cur on unthrottling Date: Mon, 13 Jul 2015 19:40:02 +0530 Message-Id: <1436796602-10228-7-git-send-email-shilpa.bhat@linux.vnet.ibm.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1436796602-10228-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> References: <1436796602-10228-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15071314-0009-0000-0000-000001B25A45 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2967 Lines: 98 If frequency is throttled due to OCC reset then cpus will be in Psafe frequency, so restore the frequency on all cpus to policy->cur when OCCs are active again. And if frequency is throttled due to Pmax capping then restore the frequency of all the cpus in the chip on unthrottling. Signed-off-by: Shilpasri G Bhat --- Changes from v3: - Refer to the members of 'struct opal_occ_msg' in the patch. Replace 'reason' with 'omsg.throttle_status' drivers/cpufreq/powernv-cpufreq.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index d6d7e68..824141a 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -48,6 +48,7 @@ static struct chip { bool throttled; cpumask_t mask; struct work_struct throttle; + bool restore; } *chips; static int nr_chips; @@ -415,9 +416,29 @@ static struct notifier_block powernv_cpufreq_reboot_nb = { void powernv_cpufreq_work_fn(struct work_struct *work) { struct chip *chip = container_of(work, struct chip, throttle); + unsigned int cpu; + cpumask_var_t mask; smp_call_function_any(&chip->mask, powernv_cpufreq_throttle_check, NULL, 0); + + if (!chip->restore) + return; + + chip->restore = false; + cpumask_copy(mask, &chip->mask); + for_each_cpu_and(cpu, mask, cpu_online_mask) { + int index, tcpu; + struct cpufreq_policy policy; + + cpufreq_get_policy(&policy, cpu); + cpufreq_frequency_table_target(&policy, policy.freq_table, + policy.cur, + CPUFREQ_RELATION_C, &index); + powernv_cpufreq_target_index(&policy, index); + for_each_cpu(tcpu, policy.cpus) + cpumask_clear_cpu(tcpu, mask); + } } static char throttle_reason[][30] = { @@ -466,8 +487,10 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb, throttled = false; pr_info("OCC: Active\n"); - for (i = 0; i < nr_chips; i++) + for (i = 0; i < nr_chips; i++) { + chips[i].restore = true; schedule_work(&chips[i].throttle); + } return 0; } @@ -484,8 +507,11 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb, return 0; for (i = 0; i < nr_chips; i++) - if (chips[i].id == omsg.chip) + if (chips[i].id == omsg.chip) { + if (!omsg.throttle_status) + chips[i].restore = true; schedule_work(&chips[i].throttle); + } } return 0; } @@ -539,6 +565,7 @@ static int init_chip_info(void) chips[i].throttled = false; cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i])); INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn); + chips[i].restore = false; } return 0; -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/