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[209.132.180.67]) by mx.google.com with ESMTP id s1si6996560oij.237.2020.03.23.09.00.03; Mon, 23 Mar 2020 09:00:19 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=YSYjEAYd; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727431AbgCWP6M (ORCPT + 99 others); Mon, 23 Mar 2020 11:58:12 -0400 Received: from mail-vs1-f68.google.com ([209.85.217.68]:44767 "EHLO mail-vs1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727129AbgCWP6L (ORCPT ); Mon, 23 Mar 2020 11:58:11 -0400 Received: by mail-vs1-f68.google.com with SMTP id e138so9042787vsc.11 for ; Mon, 23 Mar 2020 08:58:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=n3nF2XEJF+3VJmtugEEG0k9Mal8VgUQrukDbfKGmZmw=; b=YSYjEAYdWU+Fcf3THNsHZiqYlveQL9H5/YFc9huB2qW0SVXTH1coofuUlbrn12kIXG oEk+JCxz5/G4NuMkHiNN7TAz7qKbGH/2/LivZdBvUWyHlsMIQKNiU0onzYv8obbaoTjt aeVMD/Sshl9NlDcl26nZwcS9+y/BY7b/zTqTcHFSp9ZQaR0PJSbVTm8cebq6uNXVaIt6 59OCuJye0bTcysKaPKl2VgWUCHsPLLdSSdH9zqfrmljm1SRIc9ovUMHITte6oii5+Ggo I7/RrIzz0BW+kdgHwlADprLyL3QG6UqLfHEgIq9e+d1drrFHbg7oOZajk5V27vtRp6JJ fh6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=n3nF2XEJF+3VJmtugEEG0k9Mal8VgUQrukDbfKGmZmw=; b=RVVnCldUxg+tkTiZ/ZIAxlSxQGFU/yeH4+dmnAVBzA72n7IdxcDVVjxfUidfQAhIZk RtlsWBSTFiyJ26+u8Q0sd1cmTE7An0mKmUjznUYnooSMCV2e5eUPjggMxTvXiBAG6moU XIYoFDKtBoLJmkuWqfGPExbPu2IQS9RtIF2o5a/ES5vg0NRn9Bdw/uEikRH9yNSD7NZf lxyCGRJP/UKkSbCfZRWhnN94Jarpj0Gf9YBHZ+Dn+LHn4e8hr06j8rGqAko1dkx7f1f6 uLVPi5kAWRaaGLWEd2v3XEQ8fHmO17eR8RyARz3lCDFD0qms5xiKvPWOxANIyo0Y3cZT 7QBg== X-Gm-Message-State: ANhLgQ3jaT3Ld1UylI7oDL3h6Y9eOAbvsDGCZK3BObI5dPfqMY8siEuK dRcDfxpcThXcR97R/rjT21W7PQd9k7DwgABJdlSR9w== X-Received: by 2002:a05:6102:2051:: with SMTP id q17mr16732708vsr.165.1584979089841; Mon, 23 Mar 2020 08:58:09 -0700 (PDT) MIME-Version: 1.0 References: <20200320014107.26087-1-thara.gopinath@linaro.org> <20200320014107.26087-4-thara.gopinath@linaro.org> In-Reply-To: <20200320014107.26087-4-thara.gopinath@linaro.org> From: Ulf Hansson Date: Mon, 23 Mar 2020 16:57:33 +0100 Message-ID: Subject: Re: [Patch v5 3/6] thermal: Add generic power domain warming device driver. To: Thara Gopinath Cc: Zhang Rui , Daniel Lezcano , Bjorn Andersson , Andy Gross , Rob Herring , Amit Kucheria , Mark Rutland , "Rafael J. Wysocki" , Linux PM , DTML , linux-arm-msm , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 20 Mar 2020 at 02:41, Thara Gopinath wrote: > > 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); This is wrong, you should free a "struct pd_warming_device *". Use the "container of" macro to get it from '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; If you use and ida, you might as well use it as a part of the dev_set_name() above. That should give you a unique name, similar to how you use it for the cdev_name below. > + > + 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); This is wrong, drop this. > +free_pd_wdev: > + kfree(pd_wdev); Since you should free this from the ->release() callback, there is no need to do this here. > + 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); Don't use kfree here, but instead device_unregister(dev); > +} > +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__ */ > -- > 2.20.1 > Besides the few things above, this looks good to me. Kind regards Uffe