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[71.255.246.27]) by smtp.googlemail.com with ESMTPSA id 2sm2706287qtp.33.2020.03.19.18.41.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Mar 2020 18:41:13 -0700 (PDT) From: Thara Gopinath To: rui.zhang@intel.com, ulf.hansson@linaro.org, daniel.lezcano@linaro.org, bjorn.andersson@linaro.org, agross@kernel.org, robh@kernel.org Cc: amit.kucheria@verdurent.com, mark.rutland@arm.com, rjw@rjwysocki.net, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [Patch v5 3/6] thermal: Add generic power domain warming device driver. Date: Thu, 19 Mar 2020 21:41:04 -0400 Message-Id: <20200320014107.26087-4-thara.gopinath@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200320014107.26087-1-thara.gopinath@linaro.org> References: <20200320014107.26087-1-thara.gopinath@linaro.org> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Resources modeled as power domains in linux kernel can be used to warm the SoC(eg. mx power domain on sdm845). To support this feature, introduce a generic power domain warming device driver that can be plugged into the thermal framework (The thermal framework itself requires further modifiction to support a warming device in place of a cooling device. Those extensions are not introduced in this patch series). Signed-off-by: Thara Gopinath --- v3->v4: - Removed late_init hook pd_warming_device_ops. - Use of_genpd_add_device instead of pm_genpd_add_device to attach device to the generic power domain. - Use thermal_of_cooling_device_parent_register to register the cooling device so that the device with genpd attached can be made parent of the cooling device. - With above changes, remove reference to generic_pm_domain in pd_warming_device. v4->v5: - All the below changes are as per Ulf's review comments. - Renamed pwr_domain_warming.c and pwr_domain_warming.h to pd_warming.c and pd_warming.h. - Renamed pwr_domain_warming_register API to of_pd_warming_register. - Dropped in-param pd_name to of_pd_warming_register. - Introduced ID allocator to uniquely identify each power domain warming device. - Introduced pd_warming_release to handle device kfree for pd_warming_device. - Introduced pm_genpd_remove_device in the error exit path of of_pd_warming_register. drivers/thermal/Kconfig | 10 +++ drivers/thermal/Makefile | 2 + drivers/thermal/pd_warming.c | 168 +++++++++++++++++++++++++++++++++++ include/linux/pd_warming.h | 29 ++++++ 4 files changed, 209 insertions(+) create mode 100644 drivers/thermal/pd_warming.c create mode 100644 include/linux/pd_warming.h diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 4d6753f2b18f..92522d541d0e 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -206,6 +206,16 @@ config DEVFREQ_THERMAL If you want this support, you should say Y here. +config PWR_DOMAIN_WARMING_THERMAL + bool "Power Domain based warming device" + depends on PM_GENERIC_DOMAINS_OF + help + This implements the generic power domain based warming + mechanism through increasing the performance state of + a power domain. + + If you want this support, you should say Y here. + config THERMAL_EMULATION bool "Thermal emulation mode support" help diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 8c8ed7b79915..7db87a779126 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -28,6 +28,8 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL) += clock_cooling.o # devfreq cooling thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o +thermal_sys-$(CONFIG_PWR_DOMAIN_WARMING_THERMAL) += pd_warming.o + # platform thermal drivers obj-y += broadcom/ obj-$(CONFIG_THERMAL_MMIO) += thermal_mmio.o diff --git a/drivers/thermal/pd_warming.c b/drivers/thermal/pd_warming.c new file mode 100644 index 000000000000..c0854d2e4b92 --- /dev/null +++ b/drivers/thermal/pd_warming.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019, Linaro Ltd + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct pd_warming_device { + struct thermal_cooling_device *cdev; + struct device dev; + int id; + int max_state; + int cur_state; + bool runtime_resumed; +}; + +static DEFINE_IDA(pd_ida); + +static int pd_wdev_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + + *state = pd_wdev->max_state; + return 0; +} + +static int pd_wdev_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + + *state = dev_pm_genpd_get_performance_state(&pd_wdev->dev); + + return 0; +} + +static int pd_wdev_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + struct device *dev = &pd_wdev->dev; + int ret; + + ret = dev_pm_genpd_set_performance_state(dev, state); + + if (ret) + return ret; + + if (state && !pd_wdev->runtime_resumed) { + ret = pm_runtime_get_sync(dev); + pd_wdev->runtime_resumed = true; + } else if (!state && pd_wdev->runtime_resumed) { + ret = pm_runtime_put(dev); + pd_wdev->runtime_resumed = false; + } + + return ret; +} + +static struct thermal_cooling_device_ops pd_warming_device_ops = { + .get_max_state = pd_wdev_get_max_state, + .get_cur_state = pd_wdev_get_cur_state, + .set_cur_state = pd_wdev_set_cur_state, +}; + +static void pd_warming_release(struct device *dev) +{ + kfree(dev); +} + +struct thermal_cooling_device * +of_pd_warming_register(struct device *parent, int pd_id) +{ + struct pd_warming_device *pd_wdev; + struct of_phandle_args pd_args; + char cdev_name[THERMAL_NAME_LENGTH]; + int ret; + + pd_wdev = kzalloc(sizeof(*pd_wdev), GFP_KERNEL); + if (!pd_wdev) + return ERR_PTR(-ENOMEM); + + dev_set_name(&pd_wdev->dev, "%s_%d_warming_dev", + dev_name(parent), pd_id); + pd_wdev->dev.parent = parent; + pd_wdev->dev.release = pd_warming_release; + + ret = device_register(&pd_wdev->dev); + if (ret) { + put_device(&pd_wdev->dev); + goto free_pd_wdev; + } + + ret = ida_simple_get(&pd_ida, 0, 0, GFP_KERNEL); + if (ret < 0) + goto unregister_device; + + pd_wdev->id = ret; + + pd_args.np = parent->of_node; + pd_args.args[0] = pd_id; + pd_args.args_count = 1; + + ret = of_genpd_add_device(&pd_args, &pd_wdev->dev); + + if (ret) + goto remove_ida; + + ret = dev_pm_genpd_performance_state_count(&pd_wdev->dev); + if (ret < 0) + goto out_genpd; + + pd_wdev->max_state = ret - 1; + pm_runtime_enable(&pd_wdev->dev); + pd_wdev->runtime_resumed = false; + + snprintf(cdev_name, sizeof(cdev_name), "thermal-pd-%d", pd_wdev->id); + pd_wdev->cdev = thermal_of_cooling_device_register + (NULL, cdev_name, pd_wdev, + &pd_warming_device_ops); + if (IS_ERR(pd_wdev->cdev)) { + pr_err("unable to register %s cooling device\n", cdev_name); + ret = PTR_ERR(pd_wdev->cdev); + goto out_runtime_disable; + } + + return pd_wdev->cdev; + +out_runtime_disable: + pm_runtime_disable(&pd_wdev->dev); +out_genpd: + pm_genpd_remove_device(&pd_wdev->dev); +remove_ida: + ida_simple_remove(&pd_ida, pd_wdev->id); +unregister_device: + device_unregister(&pd_wdev->dev); + pd_warming_release(&pd_wdev->dev); +free_pd_wdev: + kfree(pd_wdev); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(of_pd_warming_register); + +void pd_warming_unregister(struct thermal_cooling_device *cdev) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + struct device *dev = &pd_wdev->dev; + + if (pd_wdev->runtime_resumed) { + dev_pm_genpd_set_performance_state(dev, 0); + pm_runtime_put(dev); + pd_wdev->runtime_resumed = false; + } + pm_runtime_disable(dev); + pm_genpd_remove_device(dev); + ida_simple_remove(&pd_ida, pd_wdev->id); + thermal_cooling_device_unregister(cdev); + kfree(pd_wdev); +} +EXPORT_SYMBOL_GPL(pd_warming_unregister); diff --git a/include/linux/pd_warming.h b/include/linux/pd_warming.h new file mode 100644 index 000000000000..550a5683b56d --- /dev/null +++ b/include/linux/pd_warming.h @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019, Linaro Ltd. + */ +#ifndef __PWR_DOMAIN_WARMING_H__ +#define __PWR_DOMAIN_WARMING_H__ + +#include +#include + +#ifdef CONFIG_PWR_DOMAIN_WARMING_THERMAL +struct thermal_cooling_device * +of_pd_warming_register(struct device *parent, int pd_id); + +void pd_warming_unregister(struct thermal_cooling_device *cdev); + +#else +static inline struct thermal_cooling_device * +of_pd_warming_register(struct device *parent, int pd_id) +{ + return ERR_PTR(-ENOSYS); +} + +static inline void +pd_warming_unregister(struct thermal_cooling_device *cdev) +{ +} +#endif /* CONFIG_PWR_DOMAIN_WARMING_THERMAL */ +#endif /* __PWR_DOMAIN_WARMING_H__ */