From patchwork Fri Apr 12 14:37:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 788829 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (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 072E81419B1; Fri, 12 Apr 2024 14:40:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712932856; cv=none; b=tiSiNg8GrJdkRXxr5dysvF4FDQMo8xzd2hkWKfGrHeM53S+K033hR3Neu61CUtkujN/0qQAW0XujZi/nCyaRIcHBYJmaRMrdYHgGaaVfMTh+/yUY6qOVELwSdMT3EoV+RAhLM2yxCkVY5JBB3XavJKuiumFWGyeEsDqp5XVvL0w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712932856; c=relaxed/simple; bh=ip6fFydK0+gzKotHNwObsUiXCO5CAhdHx4vmOp5jT9c=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NyDh/xMIxmfl9P0fGpNkQqynmCfg5vCJWWOvloKThSiXedU7f565m9F04wmENPisl5vV6wsZy5sP7I7Fr+qh//QgVebtqqX806uRnunTOW0ni0T/DZZ/ApnhQQcNXwxgyKiVSR9X5ROAYslnl34+BnamolOEHRJYSMYmrcfODjA= 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=185.176.79.56 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 [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4VGK2M4h4bz6K5nM; Fri, 12 Apr 2024 22:39:07 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id EFDC2140CF4; Fri, 12 Apr 2024 22:40:51 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Fri, 12 Apr 2024 15:40:51 +0100 From: Jonathan Cameron To: , , , , , , , , Russell King , "Rafael J . Wysocki" , Miguel Luis , James Morse , Salil Mehta , Jean-Philippe Brucker , Catalin Marinas , Will Deacon CC: , , Subject: [PATCH v5 07/18] ACPI: Add post_eject to struct acpi_scan_handler for cpu hotplug Date: Fri, 12 Apr 2024 15:37:08 +0100 Message-ID: <20240412143719.11398-8-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240412143719.11398-1-Jonathan.Cameron@huawei.com> References: <20240412143719.11398-1-Jonathan.Cameron@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500006.china.huawei.com (7.191.161.198) To lhrpeml500005.china.huawei.com (7.191.163.240) From: James Morse struct acpi_scan_handler has a detach callback that is used to remove a driver when a bus is changed. When interacting with an eject-request, the detach callback is called before _EJ0. This means the ACPI processor driver can't use _STA to determine if a CPU has been made not-present, or some of the other _STA bits have been changed. acpi_processor_remove() needs to know the value of _STA after _EJ0 has been called. Add a post_eject callback to struct acpi_scan_handler. This is called after acpi_scan_hot_remove() has successfully called _EJ0. Because acpi_scan_check_and_detach() also clears the handler pointer, it needs to be told if the caller will go on to call acpi_bus_post_eject(), so that acpi_device_clear_enumerated() and clearing the handler pointer can be deferred. The extra eject flag added in the previous patch is used for this purpose. Signed-off-by: James Morse Reviewed-by: Joanthan Cameron Reviewed-by: Gavin Shan Tested-by: Miguel Luis Tested-by: Vishnu Pajjuri Tested-by: Jianyong Wu Signed-off-by: Jonathan Cameron ---- Russell, you hadn't signed off on this when posting last time. Do you want to insert a suitable tag now? v5: - Rebase to take into account the changes to scan handling in the meantime. --- drivers/acpi/acpi_processor.c | 4 ++-- drivers/acpi/scan.c | 32 +++++++++++++++++++++++++++++--- include/acpi/acpi_bus.h | 1 + 3 files changed, 32 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 3aa43dee4391..6b2ee0643d11 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -463,7 +463,7 @@ static int acpi_processor_add(struct acpi_device *device, #ifdef CONFIG_ACPI_HOTPLUG_CPU /* Removal */ -static void acpi_processor_remove(struct acpi_device *device) +static void acpi_processor_post_eject(struct acpi_device *device) { struct acpi_processor *pr; @@ -631,7 +631,7 @@ static struct acpi_scan_handler processor_handler = { .ids = processor_device_ids, .attach = acpi_processor_add, #ifdef CONFIG_ACPI_HOTPLUG_CPU - .detach = acpi_processor_remove, + .post_eject = acpi_processor_post_eject, #endif .hotplug = { .enabled = true, diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 79b1f4d2b6bd..992779ac31d4 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -276,8 +276,6 @@ static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p) if (handler) { if (handler->detach) handler->detach(adev); - - adev->handler = NULL; } else { device_release_driver(&adev->dev); } @@ -287,6 +285,28 @@ static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p) */ acpi_device_set_power(adev, ACPI_STATE_D3_COLD); adev->flags.initialized = false; + + /* For eject this is deferred to acpi_bus_post_eject() */ + if (!param->eject) { + adev->handler = NULL; + acpi_device_clear_enumerated(adev); + } + return 0; +} + +static int acpi_bus_post_eject(struct acpi_device *adev, void *not_used) +{ + struct acpi_scan_handler *handler = adev->handler; + + acpi_dev_for_each_child_reverse(adev, acpi_bus_post_eject, NULL); + + if (handler) { + if (handler->post_eject) + handler->post_eject(adev); + + adev->handler = NULL; + } + acpi_device_clear_enumerated(adev); return 0; @@ -306,6 +326,10 @@ static int acpi_scan_hot_remove(struct acpi_device *device) acpi_handle handle = device->handle; unsigned long long sta; acpi_status status; + struct acpi_scan_c_and_d_param p = { + .check_status = false, /* Not update until after ej0 */ + .eject = true, + }; if (device->handler && device->handler->hotplug.demand_offline) { if (!acpi_scan_is_offline(device, true)) @@ -318,7 +342,7 @@ static int acpi_scan_hot_remove(struct acpi_device *device) acpi_handle_debug(handle, "Ejecting\n"); - acpi_bus_trim(device); + acpi_scan_check_and_detach(device, &p); acpi_evaluate_lck(handle, 0); /* @@ -341,6 +365,8 @@ static int acpi_scan_hot_remove(struct acpi_device *device) } else if (sta & ACPI_STA_DEVICE_ENABLED) { acpi_handle_warn(handle, "Eject incomplete - status 0x%llx\n", sta); + } else { + acpi_bus_post_eject(device, NULL); } return 0; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index e193507fd743..27fdef17abe5 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -130,6 +130,7 @@ struct acpi_scan_handler { bool (*match)(const char *idstr, const struct acpi_device_id **matchid); int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id); void (*detach)(struct acpi_device *dev); + void (*post_eject)(struct acpi_device *dev); void (*bind)(struct device *phys_dev); void (*unbind)(struct device *phys_dev); struct acpi_hotplug_profile hotplug;