From patchwork Tue Nov 12 02:03:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "lihuisong (C)" X-Patchwork-Id: 13871657 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 233C6208971; Tue, 12 Nov 2024 02:14:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731377678; cv=none; b=S5Rm4TpauD12zl0IdiGKZaGoCAmMM8CBZ6D7Ha7SQmuW9N84GXT1KZvhUQzzmDV2hfmJqHwyow0crxqTqLn6lmG3sN2ejcTDf+mWF8qS5clZYbEmdZeT3acva6FVqPguQ6dopDcrND+ajZbhYta+h1wsWjfAui93wjZyaYC7eHo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731377678; c=relaxed/simple; bh=IDtzZOHG5JBqnfrcxS2T7mLOiushLLE+N5GaCFCFo+U=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=HK/GABVFU6AUfhVOJY4bEIv5bRQiJ7HlXZrF6tWE9mTKLXrP9Q8fxKW0MhYQg4uI0ecZ5jwWyMOcGM8p/cRoIwVZzXgy1NvQ3UrpV73ymJQbnmbL7MobroiB2t5vwjMVwA216qUrEoU8FstggUTVi1tukf2HqHSvnu6jQxqJltI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.163]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4XnVLN1DNwz1jxtv; Tue, 12 Nov 2024 10:12:44 +0800 (CST) Received: from dggemv711-chm.china.huawei.com (unknown [10.1.198.66]) by mail.maildlp.com (Postfix) with ESMTPS id 45DB7180042; Tue, 12 Nov 2024 10:14:32 +0800 (CST) Received: from kwepemn100009.china.huawei.com (7.202.194.112) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 12 Nov 2024 10:14:32 +0800 Received: from localhost.localdomain (10.28.79.22) by kwepemn100009.china.huawei.com (7.202.194.112) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 12 Nov 2024 10:14:31 +0800 From: Huisong Li To: , , CC: , , , , Subject: [PATCH] ACPI: thermal: Support for linking devices associated with the thermal zone Date: Tue, 12 Nov 2024 10:03:27 +0800 Message-ID: <20241112020327.17781-1-lihuisong@huawei.com> X-Mailer: git-send-email 2.22.0 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemn100009.china.huawei.com (7.202.194.112) As ACPI spec said, '_TZD' evaluates to a package of device names. Each name corresponds to a device in the ACPI namespace that is associated with the thermal zone. The temperature reported by the thermal zone is roughly correspondent to that of each of the devices. Signed-off-by: Huisong Li --- drivers/acpi/thermal.c | 114 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 113 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index 78db38c7076e..398195a5d42f 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -119,6 +119,9 @@ struct acpi_thermal { struct work_struct thermal_check_work; struct mutex thermal_check_lock; refcount_t thermal_check_count; + int num_domain_devices; + struct acpi_device **domain_devices; + struct kobject *holders_dir; }; /* -------------------------------------------------------------------------- @@ -589,6 +592,103 @@ static const struct thermal_zone_device_ops acpi_thermal_zone_ops = { .critical = acpi_thermal_zone_device_critical, }; +static void acpi_thermal_remove_domain_devices(struct acpi_thermal *tz) +{ + int i; + + if (!tz->num_domain_devices) + return; + + for (i = 0; i < tz->num_domain_devices; i++) { + struct acpi_device *obj = tz->domain_devices[i]; + + if (!obj) + continue; + + sysfs_remove_link(tz->holders_dir, + kobject_name(&obj->dev.kobj)); + acpi_dev_put(obj); + } + + kfree(tz->domain_devices); + kobject_put(tz->holders_dir); + tz->num_domain_devices = 0; +} + +static int acpi_thermal_read_domain_devices(struct acpi_thermal *tz) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *pss; + acpi_status status; + int ret = 0; + int i; + + status = acpi_evaluate_object(tz->device->handle, "_TZD", NULL, + &buffer); + if (ACPI_FAILURE(status)) { + acpi_evaluation_failure_warn(tz->device->handle, "_TZD", + status); + return -ENODEV; + } + + pss = buffer.pointer; + if (!pss || + pss->type != ACPI_TYPE_PACKAGE) { + dev_err(&tz->device->dev, "Thermal zone invalid _TZD data\n"); + ret = -EFAULT; + goto end; + } + + if (!pss->package.count) + goto end; + + tz->domain_devices = kcalloc(pss->package.count, + sizeof(struct acpi_device *), GFP_KERNEL); + if (!tz->domain_devices) { + ret = -ENOMEM; + goto end; + } + + tz->holders_dir = kobject_create_and_add("measures", + &tz->device->dev.kobj); + if (!tz->holders_dir) { + ret = -ENOMEM; + goto exit_free; + } + + tz->num_domain_devices = pss->package.count; + for (i = 0; i < pss->package.count; i++) { + struct acpi_device *obj; + union acpi_object *element = &pss->package.elements[i]; + + /* Refuse non-references */ + if (element->type != ACPI_TYPE_LOCAL_REFERENCE) + continue; + + /* Create a symlink to domain objects */ + obj = acpi_get_acpi_dev(element->reference.handle); + tz->domain_devices[i] = obj; + if (!obj) + continue; + + ret = sysfs_create_link(tz->holders_dir, &obj->dev.kobj, + kobject_name(&obj->dev.kobj)); + if (ret) { + acpi_dev_put(obj); + tz->domain_devices[i] = NULL; + } + } + + ret = 0; + goto end; + +exit_free: + kfree(tz->domain_devices); +end: + kfree(buffer.pointer); + return ret; +} + static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz) { struct device *tzdev = thermal_zone_device(tz->thermal_zone); @@ -602,8 +702,19 @@ static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz) ret = sysfs_create_link(&tzdev->kobj, &tz->device->dev.kobj, "device"); if (ret) - sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); + goto remove_thermal_zone; + /* _TZD method is optional. */ + ret = acpi_thermal_read_domain_devices(tz); + if (ret != -ENODEV) + goto remove_device; + + return 0; + +remove_device: + sysfs_remove_link(&tz->device->dev.kobj, "device"); +remove_thermal_zone: + sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); return ret; } @@ -611,6 +722,7 @@ static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz) { struct device *tzdev = thermal_zone_device(tz->thermal_zone); + acpi_thermal_remove_domain_devices(tz); sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); sysfs_remove_link(&tzdev->kobj, "device"); }