From patchwork Mon Mar 24 04:06:09 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 3881171 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id B10F99F43E for ; Mon, 24 Mar 2014 04:07:56 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C93C7202AE for ; Mon, 24 Mar 2014 04:07:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA3F120263 for ; Mon, 24 Mar 2014 04:07:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751124AbaCXEGu (ORCPT ); Mon, 24 Mar 2014 00:06:50 -0400 Received: from mga01.intel.com ([192.55.52.88]:37242 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750790AbaCXEGg (ORCPT ); Mon, 24 Mar 2014 00:06:36 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 23 Mar 2014 21:06:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,718,1389772800"; d="scan'208";a="505176971" Received: from unknown (HELO [10.255.20.24]) ([10.255.20.24]) by fmsmga002.fm.intel.com with ESMTP; 23 Mar 2014 21:06:11 -0700 Message-ID: <1395633969.2206.36.camel@rzhang1-mobl4> Subject: Re: [PATCH V4 07/11] ACPI: use platform bus as the default bus for _HID enumeration From: Zhang Rui To: "Rafael J. Wysocki" Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, bhelgaas@google.com, matthew.garrett@nebula.com, rafael.j.wysocki@intel.com, dmitry.torokhov@gmail.com Date: Mon, 24 Mar 2014 12:06:09 +0800 In-Reply-To: <28494711.6ccuzjUcKA@vostro.rjw.lan> References: <1395042580-3344-1-git-send-email-rui.zhang@intel.com> <1395042580-3344-8-git-send-email-rui.zhang@intel.com> <28494711.6ccuzjUcKA@vostro.rjw.lan> X-Mailer: Evolution 3.2.3-0ubuntu6 Mime-Version: 1.0 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Mon, 2014-03-24 at 03:00 +0100, Rafael J. Wysocki wrote: > On Monday, March 17, 2014 03:49:36 PM Zhang Rui wrote: > > Because of the growing demand for enumerating ACPI devices to platform bus, > > this patch changes the code to enumerate ACPI devices with _HID to > > platform bus by default, unless the device already has a scan handler attached. > > I think we need to be more careful here still. > > For example, we shouldn't create platform devices for ACPI device objects that > correspond to I2C devices (or any other "simple peripheral bus" devices for that > matter). > agreed. Then how about the patch below? Note that I've just finished with build test. thanks, rui From a21cef9a840d979362bfaac3feeae19236a93d22 Mon Sep 17 00:00:00 2001 From: Zhang Rui Date: Mon, 24 Mar 2014 11:48:05 +0800 Subject: [PATCH] ACPI: introduce .handle_children flag for acpi scan handler For some devices with scan handler attached, their children devices are enumerated by the scan handler, indirectly, as well. In this case, we do not want to enumerate the children devices in acpi scan code explicitly. Thus a new flag .handle_children is introduced in this patch. For scan handlers with this flag set, we will do default enumeration neither for the attached devices nor for the children of the attached devices. Signed-off-by: Zhang Rui --- drivers/acpi/acpi_lpss.c | 1 + drivers/acpi/scan.c | 28 ++++++++++++++++++++++++++-- include/acpi/acpi_bus.h | 4 +++- 3 files changed, 30 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index cfbf2c0..9857343 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -453,6 +453,7 @@ static int acpi_lpss_dummy_attach(struct acpi_device *adev, static struct acpi_scan_handler lpss_dummy_handler = { .ids = acpi_lpss_device_ids, .attach = acpi_lpss_dummy_attach, + .handle_children = true, }; void __init acpi_lpss_init(void) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index c0456e7..cd833f4 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2016,6 +2016,31 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, return AE_OK; } +static void acpi_do_default_enumeration(struct acpi_device *device) +{ + /* + * Do not do enumeration for device object that + * its parent doesn't want to + */ + if (device->parent && device->parent->flags.no_child_enumeration) { + device->flags.no_child_enumeration = 1; + return; + } + + /* Do not do enumeration for device object with scan handler attached */ + if (device->handler) { + if (device->handler->handle_children) + device->flags.no_child_enumeration = 1; + return; + } + + /* Do not do enumeration for device object w/o platform_id */ + if (!device->pnp.type.platform_id) + return; + + acpi_create_platform_device(device, NULL); +} + static int acpi_scan_attach_handler(struct acpi_device *device) { struct acpi_hardware_id *hwid; @@ -2035,8 +2060,7 @@ static int acpi_scan_attach_handler(struct acpi_device *device) } } end: - if (device->pnp.type.platform_id && !device->handler) - acpi_create_platform_device(device, NULL); + acpi_do_default_enumeration(device); return ret; } diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index f998746..bc7235f 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -135,6 +135,7 @@ struct acpi_scan_handler { int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id); void (*detach)(struct acpi_device *dev); struct acpi_hotplug_profile hotplug; + bool handle_children; }; /* @@ -191,7 +192,8 @@ struct acpi_device_flags { u32 initialized:1; u32 visited:1; u32 no_hotplug:1; - u32 reserved:24; + u32 no_child_enumeration:1; + u32 reserved:23; }; /* File System */