From: Ulf Hansson <ulf.hansson@linaro.org> To: "Rafael J . Wysocki" <rafael@kernel.org>, linux-pm@vger.kernel.org Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>, Geert Uytterhoeven <geert+renesas@glider.be>, Maulik Shah <quic_mkshah@quicinc.com>, Gabriel Fernandez <gabriel.fernandez@foss.st.com>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Dmitry Osipenko <digetx@gmail.com>, Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/14] PM: domains: Allocate gpd_timing_data dynamically based on governor Date: Wed, 11 May 2022 16:56:56 +0200 [thread overview] Message-ID: <20220511145704.698189-7-ulf.hansson@linaro.org> (raw) In-Reply-To: <20220511145704.698189-1-ulf.hansson@linaro.org> If a genpd doesn't have an associated governor assigned, there's really no point to allocate the per device gpd_timing_data, as the data isn't being used by a governor anyway. To avoid wasting memory, let's therefore convert the corresponding td variable in the struct generic_pm_domain_data into a pointer and manage the allocation of its data dynamically. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/base/power/domain.c | 48 +++++++++++++++++++--------- drivers/base/power/domain_governor.c | 9 ++++-- include/linux/pm_domain.h | 2 +- 3 files changed, 40 insertions(+), 19 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a3e727c9a4fa..ca86fb3db901 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -773,13 +773,16 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, for (;;) { struct generic_pm_domain *genpd; struct pm_domain_data *pdd; + struct gpd_timing_data *td; spin_lock_irq(&dev->power.lock); pdd = dev->power.subsys_data ? dev->power.subsys_data->domain_data : NULL; if (pdd) { - to_gpd_data(pdd)->td.constraint_changed = true; + td = to_gpd_data(pdd)->td; + if (td) + td->constraint_changed = true; genpd = dev_to_genpd(dev); } else { genpd = ERR_PTR(-ENODATA); @@ -875,7 +878,7 @@ static int genpd_runtime_suspend(struct device *dev) struct generic_pm_domain *genpd; bool (*suspend_ok)(struct device *__dev); struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - struct gpd_timing_data *td = &gpd_data->td; + struct gpd_timing_data *td = gpd_data->td; bool runtime_pm = pm_runtime_enabled(dev); ktime_t time_start; s64 elapsed_ns; @@ -915,7 +918,7 @@ static int genpd_runtime_suspend(struct device *dev) /* Update suspend latency value if the measured time exceeds it. */ if (runtime_pm) { elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns > td->suspend_latency_ns) { + if (td && (elapsed_ns > td->suspend_latency_ns)) { td->suspend_latency_ns = elapsed_ns; dev_dbg(dev, "suspend latency exceeded, %lld ns\n", elapsed_ns); @@ -951,7 +954,7 @@ static int genpd_runtime_resume(struct device *dev) { struct generic_pm_domain *genpd; struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - struct gpd_timing_data *td = &gpd_data->td; + struct gpd_timing_data *td = gpd_data->td; bool runtime_pm = pm_runtime_enabled(dev); ktime_t time_start; s64 elapsed_ns; @@ -999,7 +1002,7 @@ static int genpd_runtime_resume(struct device *dev) /* Update resume latency value if the measured time exceeds it. */ if (timed && runtime_pm) { elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns > td->resume_latency_ns) { + if (td && (elapsed_ns > td->resume_latency_ns)) { td->resume_latency_ns = elapsed_ns; dev_dbg(dev, "resume latency exceeded, %lld ns\n", elapsed_ns); @@ -1496,9 +1499,11 @@ EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); #endif /* CONFIG_PM_SLEEP */ -static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) +static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, + bool has_governor) { struct generic_pm_domain_data *gpd_data; + struct gpd_timing_data *td; int ret; ret = dev_pm_get_subsys_data(dev); @@ -1512,26 +1517,38 @@ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) } gpd_data->base.dev = dev; - gpd_data->td.constraint_changed = true; - gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; gpd_data->next_wakeup = KTIME_MAX; - spin_lock_irq(&dev->power.lock); + /* Allocate data used by a governor. */ + if (has_governor) { + td = kzalloc(sizeof(*td), GFP_KERNEL); + if (!td) { + ret = -ENOMEM; + goto err_free; + } - if (dev->power.subsys_data->domain_data) { - ret = -EINVAL; - goto err_free; + td->constraint_changed = true; + td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; + gpd_data->td = td; } - dev->power.subsys_data->domain_data = &gpd_data->base; + spin_lock_irq(&dev->power.lock); + + if (dev->power.subsys_data->domain_data) + ret = -EINVAL; + else + dev->power.subsys_data->domain_data = &gpd_data->base; spin_unlock_irq(&dev->power.lock); + if (ret) + goto err_free; + return gpd_data; err_free: - spin_unlock_irq(&dev->power.lock); + kfree(gpd_data->td); kfree(gpd_data); err_put: dev_pm_put_subsys_data(dev); @@ -1547,6 +1564,7 @@ static void genpd_free_dev_data(struct device *dev, spin_unlock_irq(&dev->power.lock); + kfree(gpd_data->td); kfree(gpd_data); dev_pm_put_subsys_data(dev); } @@ -1611,7 +1629,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) return -EINVAL; - gpd_data = genpd_alloc_dev_data(dev); + gpd_data = genpd_alloc_dev_data(dev, genpd->gov); if (IS_ERR(gpd_data)) return PTR_ERR(gpd_data); diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c index c13e44823f16..62be9b3f8c90 100644 --- a/drivers/base/power/domain_governor.c +++ b/drivers/base/power/domain_governor.c @@ -18,6 +18,8 @@ static int dev_update_qos_constraint(struct device *dev, void *data) s64 constraint_ns; if (dev->power.subsys_data && dev->power.subsys_data->domain_data) { + struct gpd_timing_data *td = dev_gpd_data(dev)->td; + /* * Only take suspend-time QoS constraints of devices into * account, because constraints updated after the device has @@ -25,7 +27,8 @@ static int dev_update_qos_constraint(struct device *dev, void *data) * anyway. In order for them to take effect, the device has to * be resumed and suspended again. */ - constraint_ns = dev_gpd_data(dev)->td.effective_constraint_ns; + constraint_ns = td ? td->effective_constraint_ns : + PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; } else { /* * The child is not in a domain and there's no info on its @@ -49,7 +52,7 @@ static int dev_update_qos_constraint(struct device *dev, void *data) */ static bool default_suspend_ok(struct device *dev) { - struct gpd_timing_data *td = &dev_gpd_data(dev)->td; + struct gpd_timing_data *td = dev_gpd_data(dev)->td; unsigned long flags; s64 constraint_ns; @@ -215,7 +218,7 @@ static bool __default_power_down_ok(struct dev_pm_domain *pd, * domain to turn off and on (that's how much time it will * have to wait worst case). */ - td = &to_gpd_data(pdd)->td; + td = to_gpd_data(pdd)->td; constraint_ns = td->effective_constraint_ns; /* * Zero means "no suspend at all" and this runs only when all diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 043d48e4420a..126a4b9ab215 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -193,7 +193,7 @@ struct pm_domain_data { struct generic_pm_domain_data { struct pm_domain_data base; - struct gpd_timing_data td; + struct gpd_timing_data *td; struct notifier_block nb; struct notifier_block *power_nb; int cpu; -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Ulf Hansson <ulf.hansson@linaro.org> To: "Rafael J . Wysocki" <rafael@kernel.org>, linux-pm@vger.kernel.org Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>, Geert Uytterhoeven <geert+renesas@glider.be>, Maulik Shah <quic_mkshah@quicinc.com>, Gabriel Fernandez <gabriel.fernandez@foss.st.com>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Dmitry Osipenko <digetx@gmail.com>, Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/14] PM: domains: Allocate gpd_timing_data dynamically based on governor Date: Wed, 11 May 2022 16:56:56 +0200 [thread overview] Message-ID: <20220511145704.698189-7-ulf.hansson@linaro.org> (raw) In-Reply-To: <20220511145704.698189-1-ulf.hansson@linaro.org> If a genpd doesn't have an associated governor assigned, there's really no point to allocate the per device gpd_timing_data, as the data isn't being used by a governor anyway. To avoid wasting memory, let's therefore convert the corresponding td variable in the struct generic_pm_domain_data into a pointer and manage the allocation of its data dynamically. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/base/power/domain.c | 48 +++++++++++++++++++--------- drivers/base/power/domain_governor.c | 9 ++++-- include/linux/pm_domain.h | 2 +- 3 files changed, 40 insertions(+), 19 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a3e727c9a4fa..ca86fb3db901 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -773,13 +773,16 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, for (;;) { struct generic_pm_domain *genpd; struct pm_domain_data *pdd; + struct gpd_timing_data *td; spin_lock_irq(&dev->power.lock); pdd = dev->power.subsys_data ? dev->power.subsys_data->domain_data : NULL; if (pdd) { - to_gpd_data(pdd)->td.constraint_changed = true; + td = to_gpd_data(pdd)->td; + if (td) + td->constraint_changed = true; genpd = dev_to_genpd(dev); } else { genpd = ERR_PTR(-ENODATA); @@ -875,7 +878,7 @@ static int genpd_runtime_suspend(struct device *dev) struct generic_pm_domain *genpd; bool (*suspend_ok)(struct device *__dev); struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - struct gpd_timing_data *td = &gpd_data->td; + struct gpd_timing_data *td = gpd_data->td; bool runtime_pm = pm_runtime_enabled(dev); ktime_t time_start; s64 elapsed_ns; @@ -915,7 +918,7 @@ static int genpd_runtime_suspend(struct device *dev) /* Update suspend latency value if the measured time exceeds it. */ if (runtime_pm) { elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns > td->suspend_latency_ns) { + if (td && (elapsed_ns > td->suspend_latency_ns)) { td->suspend_latency_ns = elapsed_ns; dev_dbg(dev, "suspend latency exceeded, %lld ns\n", elapsed_ns); @@ -951,7 +954,7 @@ static int genpd_runtime_resume(struct device *dev) { struct generic_pm_domain *genpd; struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - struct gpd_timing_data *td = &gpd_data->td; + struct gpd_timing_data *td = gpd_data->td; bool runtime_pm = pm_runtime_enabled(dev); ktime_t time_start; s64 elapsed_ns; @@ -999,7 +1002,7 @@ static int genpd_runtime_resume(struct device *dev) /* Update resume latency value if the measured time exceeds it. */ if (timed && runtime_pm) { elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns > td->resume_latency_ns) { + if (td && (elapsed_ns > td->resume_latency_ns)) { td->resume_latency_ns = elapsed_ns; dev_dbg(dev, "resume latency exceeded, %lld ns\n", elapsed_ns); @@ -1496,9 +1499,11 @@ EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); #endif /* CONFIG_PM_SLEEP */ -static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) +static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, + bool has_governor) { struct generic_pm_domain_data *gpd_data; + struct gpd_timing_data *td; int ret; ret = dev_pm_get_subsys_data(dev); @@ -1512,26 +1517,38 @@ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) } gpd_data->base.dev = dev; - gpd_data->td.constraint_changed = true; - gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; gpd_data->next_wakeup = KTIME_MAX; - spin_lock_irq(&dev->power.lock); + /* Allocate data used by a governor. */ + if (has_governor) { + td = kzalloc(sizeof(*td), GFP_KERNEL); + if (!td) { + ret = -ENOMEM; + goto err_free; + } - if (dev->power.subsys_data->domain_data) { - ret = -EINVAL; - goto err_free; + td->constraint_changed = true; + td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; + gpd_data->td = td; } - dev->power.subsys_data->domain_data = &gpd_data->base; + spin_lock_irq(&dev->power.lock); + + if (dev->power.subsys_data->domain_data) + ret = -EINVAL; + else + dev->power.subsys_data->domain_data = &gpd_data->base; spin_unlock_irq(&dev->power.lock); + if (ret) + goto err_free; + return gpd_data; err_free: - spin_unlock_irq(&dev->power.lock); + kfree(gpd_data->td); kfree(gpd_data); err_put: dev_pm_put_subsys_data(dev); @@ -1547,6 +1564,7 @@ static void genpd_free_dev_data(struct device *dev, spin_unlock_irq(&dev->power.lock); + kfree(gpd_data->td); kfree(gpd_data); dev_pm_put_subsys_data(dev); } @@ -1611,7 +1629,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) return -EINVAL; - gpd_data = genpd_alloc_dev_data(dev); + gpd_data = genpd_alloc_dev_data(dev, genpd->gov); if (IS_ERR(gpd_data)) return PTR_ERR(gpd_data); diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c index c13e44823f16..62be9b3f8c90 100644 --- a/drivers/base/power/domain_governor.c +++ b/drivers/base/power/domain_governor.c @@ -18,6 +18,8 @@ static int dev_update_qos_constraint(struct device *dev, void *data) s64 constraint_ns; if (dev->power.subsys_data && dev->power.subsys_data->domain_data) { + struct gpd_timing_data *td = dev_gpd_data(dev)->td; + /* * Only take suspend-time QoS constraints of devices into * account, because constraints updated after the device has @@ -25,7 +27,8 @@ static int dev_update_qos_constraint(struct device *dev, void *data) * anyway. In order for them to take effect, the device has to * be resumed and suspended again. */ - constraint_ns = dev_gpd_data(dev)->td.effective_constraint_ns; + constraint_ns = td ? td->effective_constraint_ns : + PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; } else { /* * The child is not in a domain and there's no info on its @@ -49,7 +52,7 @@ static int dev_update_qos_constraint(struct device *dev, void *data) */ static bool default_suspend_ok(struct device *dev) { - struct gpd_timing_data *td = &dev_gpd_data(dev)->td; + struct gpd_timing_data *td = dev_gpd_data(dev)->td; unsigned long flags; s64 constraint_ns; @@ -215,7 +218,7 @@ static bool __default_power_down_ok(struct dev_pm_domain *pd, * domain to turn off and on (that's how much time it will * have to wait worst case). */ - td = &to_gpd_data(pdd)->td; + td = to_gpd_data(pdd)->td; constraint_ns = td->effective_constraint_ns; /* * Zero means "no suspend at all" and this runs only when all diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 043d48e4420a..126a4b9ab215 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -193,7 +193,7 @@ struct pm_domain_data { struct generic_pm_domain_data { struct pm_domain_data base; - struct gpd_timing_data td; + struct gpd_timing_data *td; struct notifier_block nb; struct notifier_block *power_nb; int cpu; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-11 14:58 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-11 14:56 [PATCH 00/14] PM: domains: Various improvements for genpd Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 01/14] PM: domains: Add GENPD_FLAG_RPM_ALWAYS_ON for the always-on governor Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 02/14] PM: domains: Drop redundant code for genpd " Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 03/14] PM: domains: Don't check PM_QOS_FLAG_NO_POWER_OFF in genpd Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 04/14] PM: domains: Rename irq_safe_dev_in_no_sleep_domain() " Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 05/14] PM: domains: Skip another warning in irq_safe_dev_in_sleep_domain() Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson [this message] 2022-05-11 14:56 ` [PATCH 06/14] PM: domains: Allocate gpd_timing_data dynamically based on governor Ulf Hansson 2022-05-11 14:56 ` [PATCH 07/14] PM: domains: Move the next_wakeup variable into the struct gpd_timing_data Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 08/14] PM: domains: Measure suspend/resume latencies in genpd based on governor Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:56 ` [PATCH 09/14] PM: domains: Fixup QoS latency measurements for IRQ safe devices in genpd Ulf Hansson 2022-05-11 14:56 ` Ulf Hansson 2022-05-11 14:57 ` [PATCH 10/14] PM: domains: Fix initialization of genpd's next_wakeup Ulf Hansson 2022-05-11 14:57 ` Ulf Hansson 2022-05-11 14:57 ` [PATCH 11/14] PM: domains: Clean up some code in pm_genpd_init() and genpd_remove() Ulf Hansson 2022-05-11 14:57 ` Ulf Hansson 2022-05-11 14:57 ` [PATCH 12/14] PM: domains: Allocate governor data dynamically based on a genpd governor Ulf Hansson 2022-05-11 14:57 ` Ulf Hansson 2022-05-11 14:57 ` [PATCH 13/14] PM: domains: Measure power-on/off latencies in genpd based on a governor Ulf Hansson 2022-05-11 14:57 ` Ulf Hansson 2022-05-11 14:57 ` [PATCH 14/14] PM: domains: Trust domain-idle-states from DT to be correct by genpd Ulf Hansson 2022-05-11 14:57 ` Ulf Hansson 2022-05-19 18:37 ` [PATCH 00/14] PM: domains: Various improvements for genpd Rafael J. Wysocki 2022-05-19 18:37 ` Rafael J. Wysocki
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