From patchwork Fri May 12 09:57:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 681709 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 865BDC77B7F for ; Fri, 12 May 2023 09:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240579AbjELJ7q (ORCPT ); Fri, 12 May 2023 05:59:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53610 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240684AbjELJ7F (ORCPT ); Fri, 12 May 2023 05:59:05 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3A5AB11B76; Fri, 12 May 2023 02:58:36 -0700 (PDT) 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 3AE9B1063; Fri, 12 May 2023 02:59:21 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.22.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CA13D3F5A1; Fri, 12 May 2023 02:58:33 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rafael@kernel.org Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com, rui.zhang@intel.com, amit.kucheria@verdurent.com, amit.kachhap@gmail.com, daniel.lezcano@linaro.org, viresh.kumar@linaro.org, len.brown@intel.com, pavel@ucw.cz, Pierre.Gondois@arm.com, ionela.voinescu@arm.com, rostedt@goodmis.org, mhiramat@kernel.org Subject: [PATCH v2 13/17] PM: EM: Refactor struct em_perf_domain and add default_table Date: Fri, 12 May 2023 10:57:39 +0100 Message-Id: <20230512095743.3393563-14-lukasz.luba@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230512095743.3393563-1-lukasz.luba@arm.com> References: <20230512095743.3393563-1-lukasz.luba@arm.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The Energy Model support runtime modifications. Refactor old implementation which accessed struct em_perf_state and introduce em_perf_domain::default_table to clean up the design. This new field is better aligned with em_perf_domain::runtime_table and helps to distinguish them better. Update all drivers or frameworks which used the old field: em_perf_domain::table and now should use em_perf_domain::default_table. Signed-off-by: Lukasz Luba --- drivers/powercap/dtpm_cpu.c | 27 ++++++++++++++++++-------- drivers/powercap/dtpm_devfreq.c | 23 +++++++++++++++------- drivers/thermal/cpufreq_cooling.c | 23 ++++++++++++++-------- drivers/thermal/devfreq_cooling.c | 23 ++++++++++++++++------ include/linux/energy_model.h | 4 ++-- kernel/power/energy_model.c | 32 ++++++++++++++++++++++--------- 6 files changed, 92 insertions(+), 40 deletions(-) diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c index 2ff7717530bf..743a0ac8ecdf 100644 --- a/drivers/powercap/dtpm_cpu.c +++ b/drivers/powercap/dtpm_cpu.c @@ -43,6 +43,7 @@ static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) { struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); struct em_perf_domain *pd = em_cpu_get(dtpm_cpu->cpu); + struct em_perf_state *table; struct cpumask cpus; unsigned long freq; u64 power; @@ -51,19 +52,21 @@ static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) cpumask_and(&cpus, cpu_online_mask, to_cpumask(pd->cpus)); nr_cpus = cpumask_weight(&cpus); + table = pd->default_table->state; + for (i = 0; i < pd->nr_perf_states; i++) { - power = pd->table[i].power * nr_cpus; + power = table[i].power * nr_cpus; if (power > power_limit) break; } - freq = pd->table[i - 1].frequency; + freq = table[i - 1].frequency; freq_qos_update_request(&dtpm_cpu->qos_req, freq); - power_limit = pd->table[i - 1].power * nr_cpus; + power_limit = table[i - 1].power * nr_cpus; return power_limit; } @@ -88,12 +91,14 @@ static u64 scale_pd_power_uw(struct cpumask *pd_mask, u64 power) static u64 get_pd_power_uw(struct dtpm *dtpm) { struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); + struct em_perf_state *table; struct em_perf_domain *pd; struct cpumask *pd_mask; unsigned long freq; int i; pd = em_cpu_get(dtpm_cpu->cpu); + table = pd->default_table->state; pd_mask = em_span_cpus(pd); @@ -101,10 +106,10 @@ static u64 get_pd_power_uw(struct dtpm *dtpm) for (i = 0; i < pd->nr_perf_states; i++) { - if (pd->table[i].frequency < freq) + if (table[i].frequency < freq) continue; - return scale_pd_power_uw(pd_mask, pd->table[i].power * + return scale_pd_power_uw(pd_mask, table[i].power * MICROWATT_PER_MILLIWATT); } @@ -115,17 +120,20 @@ static int update_pd_power_uw(struct dtpm *dtpm) { struct dtpm_cpu *dtpm_cpu = to_dtpm_cpu(dtpm); struct em_perf_domain *em = em_cpu_get(dtpm_cpu->cpu); + struct em_perf_state *table; struct cpumask cpus; int nr_cpus; cpumask_and(&cpus, cpu_online_mask, to_cpumask(em->cpus)); nr_cpus = cpumask_weight(&cpus); - dtpm->power_min = em->table[0].power; + table = em->default_table->state; + + dtpm->power_min = table[0].power; dtpm->power_min *= MICROWATT_PER_MILLIWATT; dtpm->power_min *= nr_cpus; - dtpm->power_max = em->table[em->nr_perf_states - 1].power; + dtpm->power_max = table[em->nr_perf_states - 1].power; dtpm->power_max *= MICROWATT_PER_MILLIWATT; dtpm->power_max *= nr_cpus; @@ -182,6 +190,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent) { struct dtpm_cpu *dtpm_cpu; struct cpufreq_policy *policy; + struct em_perf_state *table; struct em_perf_domain *pd; char name[CPUFREQ_NAME_LEN]; int ret = -ENOMEM; @@ -198,6 +207,8 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent) if (!pd || em_is_artificial(pd)) return -EINVAL; + table = pd->default_table->state; + dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL); if (!dtpm_cpu) return -ENOMEM; @@ -216,7 +227,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent) ret = freq_qos_add_request(&policy->constraints, &dtpm_cpu->qos_req, FREQ_QOS_MAX, - pd->table[pd->nr_perf_states - 1].frequency); + table[pd->nr_perf_states - 1].frequency); if (ret) goto out_dtpm_unregister; diff --git a/drivers/powercap/dtpm_devfreq.c b/drivers/powercap/dtpm_devfreq.c index 91276761a31d..6ef0f2b4a683 100644 --- a/drivers/powercap/dtpm_devfreq.c +++ b/drivers/powercap/dtpm_devfreq.c @@ -37,11 +37,14 @@ static int update_pd_power_uw(struct dtpm *dtpm) struct devfreq *devfreq = dtpm_devfreq->devfreq; struct device *dev = devfreq->dev.parent; struct em_perf_domain *pd = em_pd_get(dev); + struct em_perf_state *table; - dtpm->power_min = pd->table[0].power; + table = pd->default_table->state; + + dtpm->power_min = table[0].power; dtpm->power_min *= MICROWATT_PER_MILLIWATT; - dtpm->power_max = pd->table[pd->nr_perf_states - 1].power; + dtpm->power_max = table[pd->nr_perf_states - 1].power; dtpm->power_max *= MICROWATT_PER_MILLIWATT; return 0; @@ -53,22 +56,25 @@ static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit) struct devfreq *devfreq = dtpm_devfreq->devfreq; struct device *dev = devfreq->dev.parent; struct em_perf_domain *pd = em_pd_get(dev); + struct em_perf_state *table; unsigned long freq; u64 power; int i; + table = pd->default_table->state; + for (i = 0; i < pd->nr_perf_states; i++) { - power = pd->table[i].power * MICROWATT_PER_MILLIWATT; + power = table[i].power * MICROWATT_PER_MILLIWATT; if (power > power_limit) break; } - freq = pd->table[i - 1].frequency; + freq = table[i - 1].frequency; dev_pm_qos_update_request(&dtpm_devfreq->qos_req, freq); - power_limit = pd->table[i - 1].power * MICROWATT_PER_MILLIWATT; + power_limit = table[i - 1].power * MICROWATT_PER_MILLIWATT; return power_limit; } @@ -94,6 +100,7 @@ static u64 get_pd_power_uw(struct dtpm *dtpm) struct device *dev = devfreq->dev.parent; struct em_perf_domain *pd = em_pd_get(dev); struct devfreq_dev_status status; + struct em_perf_state *table; unsigned long freq; u64 power; int i; @@ -102,15 +109,17 @@ static u64 get_pd_power_uw(struct dtpm *dtpm) status = devfreq->last_status; mutex_unlock(&devfreq->lock); + table = pd->default_table->state; + freq = DIV_ROUND_UP(status.current_frequency, HZ_PER_KHZ); _normalize_load(&status); for (i = 0; i < pd->nr_perf_states; i++) { - if (pd->table[i].frequency < freq) + if (table[i].frequency < freq) continue; - power = pd->table[i].power * MICROWATT_PER_MILLIWATT; + power = table[i].power * MICROWATT_PER_MILLIWATT; power *= status.busy_time; power >>= 10; diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c index e2cc7bd30862..1d979c5e05ed 100644 --- a/drivers/thermal/cpufreq_cooling.c +++ b/drivers/thermal/cpufreq_cooling.c @@ -91,10 +91,11 @@ struct cpufreq_cooling_device { static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, unsigned int freq) { + struct em_perf_state *table = cpufreq_cdev->em->default_table->state; int i; for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { - if (freq > cpufreq_cdev->em->table[i].frequency) + if (freq > table[i].frequency) break; } @@ -104,15 +105,16 @@ static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev, static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, u32 freq) { + struct em_perf_state *table = cpufreq_cdev->em->default_table->state; unsigned long power_mw; int i; for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { - if (freq > cpufreq_cdev->em->table[i].frequency) + if (freq > table[i].frequency) break; } - power_mw = cpufreq_cdev->em->table[i + 1].power; + power_mw = table[i + 1].power; power_mw /= MICROWATT_PER_MILLIWATT; return power_mw; @@ -121,18 +123,19 @@ static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev, static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, u32 power) { + struct em_perf_state *table = cpufreq_cdev->em->default_table->state; unsigned long em_power_mw; int i; for (i = cpufreq_cdev->max_level; i > 0; i--) { /* Convert EM power to milli-Watts to make safe comparison */ - em_power_mw = cpufreq_cdev->em->table[i].power; + em_power_mw = table[i].power; em_power_mw /= MICROWATT_PER_MILLIWATT; if (power >= em_power_mw) break; } - return cpufreq_cdev->em->table[i].frequency; + return table[i].frequency; } /** @@ -262,8 +265,9 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev, static int cpufreq_state2power(struct thermal_cooling_device *cdev, unsigned long state, u32 *power) { - unsigned int freq, num_cpus, idx; struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; + unsigned int freq, num_cpus, idx; + struct em_perf_state *table; /* Request state should be less than max_level */ if (state > cpufreq_cdev->max_level) @@ -271,8 +275,9 @@ static int cpufreq_state2power(struct thermal_cooling_device *cdev, num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus); + table = cpufreq_cdev->em->default_table->state; idx = cpufreq_cdev->max_level - state; - freq = cpufreq_cdev->em->table[idx].frequency; + freq = table[idx].frequency; *power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus; return 0; @@ -378,8 +383,10 @@ static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev, #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR /* Use the Energy Model table if available */ if (cpufreq_cdev->em) { + struct em_perf_state *table; + table = cpufreq_cdev->em->default_table->state; idx = cpufreq_cdev->max_level - state; - return cpufreq_cdev->em->table[idx].frequency; + return table[idx].frequency; } #endif diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c index 262e62ab6cf2..4207ef850582 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -87,6 +87,7 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, struct devfreq_cooling_device *dfc = cdev->devdata; struct devfreq *df = dfc->devfreq; struct device *dev = df->dev.parent; + struct em_perf_state *table; unsigned long freq; int perf_idx; @@ -99,8 +100,9 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, return -EINVAL; if (dfc->em_pd) { + table = dfc->em_pd->default_table->state; perf_idx = dfc->max_state - state; - freq = dfc->em_pd->table[perf_idx].frequency * 1000; + freq = table[perf_idx].frequency * 1000; } else { freq = dfc->freq_table[state]; } @@ -123,10 +125,11 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, */ static int get_perf_idx(struct em_perf_domain *em_pd, unsigned long freq) { + struct em_perf_state *table = em_pd->default_table->state; int i; for (i = 0; i < em_pd->nr_perf_states; i++) { - if (em_pd->table[i].frequency == freq) + if (table[i].frequency == freq) return i; } @@ -181,6 +184,7 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd struct devfreq_cooling_device *dfc = cdev->devdata; struct devfreq *df = dfc->devfreq; struct devfreq_dev_status status; + struct em_perf_state *table; unsigned long state; unsigned long freq; unsigned long voltage; @@ -192,6 +196,8 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd freq = status.current_frequency; + table = dfc->em_pd->default_table->state; + if (dfc->power_ops && dfc->power_ops->get_real_power) { voltage = get_voltage(df, freq); if (voltage == 0) { @@ -204,7 +210,7 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd state = dfc->capped_state; /* Convert EM power into milli-Watts first */ - dfc->res_util = dfc->em_pd->table[state].power; + dfc->res_util = table[state].power; dfc->res_util /= MICROWATT_PER_MILLIWATT; dfc->res_util *= SCALE_ERROR_MITIGATION; @@ -225,7 +231,7 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd _normalize_load(&status); /* Convert EM power into milli-Watts first */ - *power = dfc->em_pd->table[perf_idx].power; + *power = table[perf_idx].power; *power /= MICROWATT_PER_MILLIWATT; /* Scale power for utilization */ *power *= status.busy_time; @@ -245,13 +251,15 @@ static int devfreq_cooling_state2power(struct thermal_cooling_device *cdev, unsigned long state, u32 *power) { struct devfreq_cooling_device *dfc = cdev->devdata; + struct em_perf_state *table; int perf_idx; if (state > dfc->max_state) return -EINVAL; + table = dfc->em_pd->default_table->state; perf_idx = dfc->max_state - state; - *power = dfc->em_pd->table[perf_idx].power; + *power = table[perf_idx].power; *power /= MICROWATT_PER_MILLIWATT; return 0; @@ -264,6 +272,7 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, struct devfreq *df = dfc->devfreq; struct devfreq_dev_status status; unsigned long freq, em_power_mw; + struct em_perf_state *table; s32 est_power; int i; @@ -273,6 +282,8 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, freq = status.current_frequency; + table = dfc->em_pd->default_table->state; + if (dfc->power_ops && dfc->power_ops->get_real_power) { /* Scale for resource utilization */ est_power = power * dfc->res_util; @@ -290,7 +301,7 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, */ for (i = dfc->max_state; i > 0; i--) { /* Convert EM power to milli-Watts to make safe comparison */ - em_power_mw = dfc->em_pd->table[i].power; + em_power_mw = table[i].power; em_power_mw /= MICROWATT_PER_MILLIWATT; if (est_power >= em_power_mw) break; diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index b8506df9af2d..eb28920b1b2c 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -49,7 +49,7 @@ struct em_perf_table { /** * struct em_perf_domain - Performance domain - * @table: List of performance states, in ascending order + * @default_table: Pointer to the default em_perf_table * @runtime_table: Pointer to the runtime modified em_perf_table * @nr_perf_states: Number of performance states * @flags: See "em_perf_domain flags" @@ -65,7 +65,7 @@ struct em_perf_table { * field is unused. */ struct em_perf_domain { - struct em_perf_state *table; + struct em_perf_table *default_table; struct em_perf_table __rcu *runtime_table; int nr_perf_states; unsigned long flags; diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 456d9f2b4370..204fd415ebc9 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -72,6 +72,7 @@ DEFINE_SHOW_ATTRIBUTE(em_debug_flags); static void em_debug_create_pd(struct device *dev) { + struct em_perf_table *table = dev->em_pd->default_table; struct dentry *d; int i; @@ -87,7 +88,7 @@ static void em_debug_create_pd(struct device *dev) /* Create a sub-directory for each performance state */ for (i = 0; i < dev->em_pd->nr_perf_states; i++) - em_debug_create_ps(&dev->em_pd->table[i], d); + em_debug_create_ps(&table->state[i], d); } @@ -157,7 +158,7 @@ static void em_perf_runtime_table_set(struct device *dev, * Check if the 'state' array is not actually the one from setup. * If it is then don't free it. */ - if (tmp->state == pd->table) + if (tmp->state == pd->default_table->state) call_rcu(&tmp->rcu, em_destroy_tmp_setup_rcu); else call_rcu(&tmp->rcu, em_destroy_rt_table_rcu); @@ -261,7 +262,7 @@ int em_dev_update_perf_domain(struct device *dev, struct em_data_callback *cb, /* Populate runtime table with updated values using driver callback */ for (i = 0; i < pd->nr_perf_states; i++) { - freq = pd->table[i].frequency; + freq = pd->default_table->state[i].frequency; runtime_table->state[i].frequency = freq; /* @@ -352,7 +353,7 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd, if (ret) goto free_ps_table; - pd->table = table; + pd->default_table->state = table; pd->nr_perf_states = nr_states; return 0; @@ -366,7 +367,7 @@ static int em_create_pd(struct device *dev, int nr_states, struct em_data_callback *cb, cpumask_t *cpus, unsigned long flags) { - struct em_perf_table *runtime_table; + struct em_perf_table *default_table, *runtime_table; struct em_perf_domain *pd; struct device *cpu_dev; int cpu, ret, num_cpus; @@ -391,21 +392,31 @@ static int em_create_pd(struct device *dev, int nr_states, return -ENOMEM; } + default_table = kzalloc(sizeof(*default_table), GFP_KERNEL); + if (!default_table) { + kfree(pd); + return -ENOMEM; + } + runtime_table = kzalloc(sizeof(*runtime_table), GFP_KERNEL); if (!runtime_table) { kfree(pd); + kfree(default_table); return -ENOMEM; } + pd->default_table = default_table; + ret = em_create_perf_table(dev, pd, nr_states, cb, flags); if (ret) { kfree(pd); + kfree(default_table); kfree(runtime_table); return ret; } /* Re-use temporally (till 1st modification) the memory */ - runtime_table->state = pd->table; + runtime_table->state = pd->default_table->state; rcu_assign_pointer(pd->runtime_table, runtime_table); if (_is_cpu_device(dev)) @@ -526,6 +537,7 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, bool microwatts) { unsigned long cap, prev_cap = 0; + struct em_perf_state *table; unsigned long flags = 0; int cpu, ret; @@ -584,7 +596,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, dev->em_pd->flags |= flags; - em_cpufreq_update_efficiencies(dev, dev->em_pd->table); + table = dev->em_pd->default_table->state; + em_cpufreq_update_efficiencies(dev, table); em_debug_create_pd(dev); dev_info(dev, "EM: created perf domain\n"); @@ -638,12 +651,13 @@ void em_dev_unregister_perf_domain(struct device *dev) * After the sync no updates will be in-flight, so free the old * memory. */ - if (tmp->state != pd->table) + if (tmp->state != pd->default_table->state) kfree(tmp->state); kfree(tmp); - kfree(dev->em_pd->table); + kfree(pd->default_table->state); + kfree(pd->default_table); kfree(dev->em_pd); dev->em_pd = NULL; mutex_unlock(&em_pd_mutex);