From patchwork Thu Apr 13 11:46:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Lezcano X-Patchwork-Id: 13210210 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 93B6DC77B6E for ; Thu, 13 Apr 2023 11:47:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230493AbjDMLrO (ORCPT ); Thu, 13 Apr 2023 07:47:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230270AbjDMLrD (ORCPT ); Thu, 13 Apr 2023 07:47:03 -0400 Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [IPv6:2a00:1450:4864:20::335]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 029F82737 for ; Thu, 13 Apr 2023 04:46:59 -0700 (PDT) Received: by mail-wm1-x335.google.com with SMTP id v10so1669269wmn.5 for ; Thu, 13 Apr 2023 04:46:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1681386417; x=1683978417; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Qbml5Nrapy5QlhDSKkv8bYmTatCmq94onluE6T97zsI=; b=oUIsocyL2eyfnEeDvSc9kP3wwycSa02zBdAcFMEkP/t0DZN9lw5k6CW9PCJNHY+nsc Yf8BlS6E3qC63VRrIcs7fY6N5QxIYG4QDW3GxIxROJ7WDVEkUnbvp+s+b4mjgPFwjRHc AYgzoBLIpFoOtunYrxgbZCrl0ebWWqzZrqlw0/BFPaX7rTYzQlboPUAejctfBGcJpQ3s YKqCShVRSa73RDqO8GXZDQAxcT7teUem1aD8t7kz84AxySvwiMcsl/LY/MnVsdX+KP4v wFL2a0ES9TgYKi0+4nnh+AzU+DbB+r/uHYFOJqY2nr+hB2ydVpM2RpW2jC5rJCNg593s ymEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681386417; x=1683978417; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Qbml5Nrapy5QlhDSKkv8bYmTatCmq94onluE6T97zsI=; b=Qm+ZdkDrCxYsqADF5VKucIXp+Pyoy9DJgmolhReAhImPQvR6b+9S0hywEMon6mv/Bl SlziUAENmGv6cyyl6QliyBW1hC4ooGkYS9JyVDXwFjKG7IdC12cfUWfFb8Ffv0O82d8V jO05wYCzwyeQBihXUUqECyS5TpPdpIxY0KECJjbpKSBP6sd+DPkB8BWXzo5If1lv8Rp8 ++7r6gp4X96hLetpbQgVzA7/tYHHbY6zP5p6D2Wc8gTPkMJ/OGwvJ9q6e27JsY9ItHtL GmlKwwZdQlc2fqi4qhip0GGepyokTHknLh2Wej8eF3xZA1+2sKHBXkMW6bh9AoSjRSUE NZ1Q== X-Gm-Message-State: AAQBX9e98WJYDCNaULj7ITxK5j7bWLfwcgCvNTMN/bk7x5ELjTafkGnm 7QsLd39QzTvMCJOvn+G2HCEVUg== X-Google-Smtp-Source: AKy350bIGUoozacl+l+8gvBRdFdOz3o88Qdy24W8pggqTU9BDd8RDdYNFJ6KeFxbEwXg7xB1OL3lCw== X-Received: by 2002:a1c:6a14:0:b0:3f0:3ce6:9b0e with SMTP id f20-20020a1c6a14000000b003f03ce69b0emr1683021wmc.13.1681386417430; Thu, 13 Apr 2023 04:46:57 -0700 (PDT) Received: from mai.box.freepro.com ([2a05:6e02:1041:c10:6418:c878:b0e:d11b]) by smtp.gmail.com with ESMTPSA id iz11-20020a05600c554b00b003f09aaf547asm6730590wmb.1.2023.04.13.04.46.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Apr 2023 04:46:57 -0700 (PDT) From: Daniel Lezcano To: daniel.lezcano@linaro.org, rafael@kernel.org Cc: rui.zhang@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Len Brown , linux-acpi@vger.kernel.org (open list:ACPI) Subject: [PATCH v3 5/6] thermal/drivers/acpi: Make cross dev link optional by configuration Date: Thu, 13 Apr 2023 13:46:46 +0200 Message-Id: <20230413114647.3878792-6-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230413114647.3878792-1-daniel.lezcano@linaro.org> References: <20230413114647.3878792-1-daniel.lezcano@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The ACPI thermal driver creates a link in the thermal zone device sysfs directory pointing to the device sysfs directory. At the same time, it creates a back pointer link from the device to the thermal zone device sysfs directory. From a generic perspective, having a device pointer in the sysfs thermal zone directory may make sense. But the opposite is not true as the same driver can be related to multiple thermal zones. The usage of these information is very specific to ACPI and it is questionable if they are really needed. Let's make the code optional and disable it by default. If it hurts, we will revert this change. Signed-off-by: Daniel Lezcano --- drivers/acpi/Kconfig | 13 +++++++++ drivers/acpi/thermal.c | 62 ++++++++++++++++++++++++++++-------------- 2 files changed, 55 insertions(+), 20 deletions(-) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index ccbeab9500ec..7df4e18f06ef 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -336,6 +336,19 @@ config ACPI_THERMAL To compile this driver as a module, choose M here: the module will be called thermal. +config ACPI_THERMAL_SYSFS_ADDON + bool "Enable thermal sysfs addon" + depends on ACPI_THERMAL + def_bool n + help + Enable sysfs extra information added in the thermal zone and + the driver specific sysfs directories. That could be a link + to the associated thermal zone as well as a link pointing to + the device from the thermal zone. By default those are + disabled and are candidate for removal, if you need these + information anyway, enable the option or upgrade the + userspace program using them. + config ACPI_PLATFORM_PROFILE tristate diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index 5763db4528b8..30fe189d04f8 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -787,9 +787,44 @@ static struct thermal_zone_device_ops acpi_thermal_zone_ops = { .critical = acpi_thermal_zone_device_critical, }; +#ifdef CONFIG_ACPI_THERMAL_SYSFS_ADDON +static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz) +{ + struct device *tzdev = thermal_zone_device(tz->thermal_zone); + int ret; + + ret = sysfs_create_link(&tz->device->dev.kobj, + &tzdev->kobj, "thermal_zone"); + if (ret) + return ret; + + ret = sysfs_create_link(&tzdev->kobj, + &tz->device->dev.kobj, "device"); + if (ret) + sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); + + return ret; +} + +static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz) +{ + struct device *tzdev = thermal_zone_device(tz->thermal_zone); + + sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); + sysfs_remove_link(&tzdev->kobj, "device"); +} +#else +static inline int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz) +{ + return 0; +} +static inline void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz) +{ +} +#endif + static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) { - struct device *tzdev; int trips = 0; int result; acpi_status status; @@ -821,23 +856,15 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) if (IS_ERR(tz->thermal_zone)) return -ENODEV; - tzdev = thermal_zone_device(tz->thermal_zone); - - result = sysfs_create_link(&tz->device->dev.kobj, - &tzdev->kobj, "thermal_zone"); + result = acpi_thermal_zone_sysfs_add(tz); if (result) goto unregister_tzd; - - result = sysfs_create_link(&tzdev->kobj, - &tz->device->dev.kobj, "device"); - if (result) - goto remove_tz_link; - + status = acpi_bus_attach_private_data(tz->device->handle, tz->thermal_zone); if (ACPI_FAILURE(status)) { result = -ENODEV; - goto remove_dev_link; + goto remove_links; } result = thermal_zone_device_enable(tz->thermal_zone); @@ -851,10 +878,8 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) acpi_bus_detach: acpi_bus_detach_private_data(tz->device->handle); -remove_dev_link: - sysfs_remove_link(&tzdev->kobj, "device"); -remove_tz_link: - sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); +remove_links: + acpi_thermal_zone_sysfs_remove(tz); unregister_tzd: thermal_zone_device_unregister(tz->thermal_zone); @@ -863,10 +888,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) { - struct device *tzdev = thermal_zone_device(tz->thermal_zone); - - sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); - sysfs_remove_link(&tzdev->kobj, "device"); + acpi_thermal_zone_sysfs_remove(tz); thermal_zone_device_unregister(tz->thermal_zone); tz->thermal_zone = NULL; acpi_bus_detach_private_data(tz->device->handle);