From patchwork Fri Jul 31 21:37:54 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 38614 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n6VLdAAC017521 for ; Fri, 31 Jul 2009 21:39:11 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753263AbZGaVi7 (ORCPT ); Fri, 31 Jul 2009 17:38:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753324AbZGaVi5 (ORCPT ); Fri, 31 Jul 2009 17:38:57 -0400 Received: from g5t0007.atlanta.hp.com ([15.192.0.44]:45779 "EHLO g5t0007.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753225AbZGaVis (ORCPT ); Fri, 31 Jul 2009 17:38:48 -0400 Received: from g5t0029.atlanta.hp.com (g5t0029.atlanta.hp.com [16.228.8.141]) by g5t0007.atlanta.hp.com (Postfix) with ESMTP id 1A33C1436F; Fri, 31 Jul 2009 21:38:49 +0000 (UTC) Received: from ldl.fc.hp.com (ldl.fc.hp.com [15.11.146.30]) by g5t0029.atlanta.hp.com (Postfix) with ESMTP id D681F10207; Fri, 31 Jul 2009 21:38:48 +0000 (UTC) Received: from localhost (ldl.fc.hp.com [127.0.0.1]) by ldl.fc.hp.com (Postfix) with ESMTP id 86CB439C009; Fri, 31 Jul 2009 15:38:48 -0600 (MDT) X-Virus-Scanned: Debian amavisd-new at ldl.fc.hp.com Received: from ldl.fc.hp.com ([127.0.0.1]) by localhost (ldl.fc.hp.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8I-vMCRkmHTH; Fri, 31 Jul 2009 15:38:45 -0600 (MDT) Received: from eh.fc.hp.com (eh.fc.hp.com [15.11.146.105]) by ldl.fc.hp.com (Postfix) with ESMTP id 178C239C00D; Fri, 31 Jul 2009 15:37:55 -0600 (MDT) Received: from bob.kio (localhost [127.0.0.1]) by eh.fc.hp.com (Postfix) with ESMTP id 0116426169; Fri, 31 Jul 2009 15:37:55 -0600 (MDT) Subject: [PATCH 16/19] ACPI: use acpi_walk_namespace() to enumerate devices To: Len Brown From: Bjorn Helgaas Cc: linux-acpi@vger.kernel.org Date: Fri, 31 Jul 2009 15:37:54 -0600 Message-ID: <20090731213754.29930.48716.stgit@bob.kio> In-Reply-To: <20090731213501.29930.39957.stgit@bob.kio> References: <20090731213501.29930.39957.stgit@bob.kio> User-Agent: StGit/0.14.3.386.gb02d MIME-Version: 1.0 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org acpi_bus_scan() currently walks the namespace manually. This patch changes it to use acpi_walk_namespace() instead. Besides removing some complicated code, this means we take advantage of the namespace locking done by acpi_walk_namespace(). The locking isn't so important at boot-time, but I hope to eventually use this same path to handle hot-addition of devices, when it will be important. Note that acpi_walk_namespace() does not actually visit the starting node first, so we need to do that by hand first. Signed-off-by: Bjorn Helgaas --- drivers/acpi/scan.c | 196 +++++++++++++++++++-------------------------------- 1 files changed, 74 insertions(+), 122 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index c0736f6..4bbfde6 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1347,123 +1347,92 @@ end: return result; } -static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops) +static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, + void *context, void **return_value) { acpi_status status = AE_OK; - struct acpi_device *parent = NULL; - struct acpi_device *child = NULL; - acpi_handle phandle = NULL; - acpi_handle chandle = NULL; + struct acpi_device *device = NULL; acpi_object_type type = 0; - u32 level = 1; - int ret; + struct acpi_bus_ops *ops = context; - /* - * We must have an acpi_device for the starting node already, and - * we scan its children. - */ - phandle = handle; - ret = acpi_bus_get_device(phandle, &parent); - if (ret) - return ret; + status = acpi_get_type(handle, &type); + if (ACPI_FAILURE(status)) + return AE_OK; /* - * Parse through the ACPI namespace, identify all 'devices', and - * create a new 'struct acpi_device' for each. + * We're only interested in objects that we consider 'devices'. */ - while ((level > 0) && parent) { + switch (type) { + case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ + case ACPI_TYPE_DEVICE: + type = ACPI_BUS_TYPE_DEVICE; + break; + case ACPI_TYPE_PROCESSOR: + type = ACPI_BUS_TYPE_PROCESSOR; + break; + case ACPI_TYPE_THERMAL: + type = ACPI_BUS_TYPE_THERMAL; + break; + case ACPI_TYPE_POWER: + type = ACPI_BUS_TYPE_POWER; + break; + default: + return AE_OK; + } - status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, - chandle, &chandle); + if (ops->acpi_op_add) + status = acpi_add_single_object(&device, handle, type, ops); + else + status = acpi_bus_get_device(handle, &device); - /* - * If this scope is exhausted then move our way back up. - */ - if (ACPI_FAILURE(status)) { - level--; - chandle = phandle; - acpi_get_parent(phandle, &phandle); - if (parent->parent) - parent = parent->parent; - continue; - } + if (ACPI_FAILURE(status)) + return AE_CTRL_DEPTH; - status = acpi_get_type(chandle, &type); + if (ops->acpi_op_start && !(ops->acpi_op_add)) { + status = acpi_start_single_object(device); if (ACPI_FAILURE(status)) - continue; - - /* - * If this is a scope object then parse it (depth-first). - */ - if (type == ACPI_TYPE_LOCAL_SCOPE) { - level++; - phandle = chandle; - chandle = NULL; - continue; - } + return AE_CTRL_DEPTH; + } - /* - * We're only interested in objects that we consider 'devices'. - */ - switch (type) { - case ACPI_TYPE_DEVICE: - type = ACPI_BUS_TYPE_DEVICE; - break; - case ACPI_TYPE_PROCESSOR: - type = ACPI_BUS_TYPE_PROCESSOR; - break; - case ACPI_TYPE_THERMAL: - type = ACPI_BUS_TYPE_THERMAL; - break; - case ACPI_TYPE_POWER: - type = ACPI_BUS_TYPE_POWER; - break; - default: - continue; - } + /* + * If the device is present, enabled, and functioning then + * parse its scope (depth-first). Note that we need to + * represent absent devices to facilitate PnP notifications + * -- but only the subtree head (not all of its children, + * which will be enumerated when the parent is inserted). + * + * TBD: Need notifications and other detection mechanisms + * in place before we can fully implement this. + * + * When the device is not present but functional, it is also + * necessary to scan the children of this device. + */ + if (!device->status.present && !device->status.functional) + return AE_CTRL_DEPTH; - if (ops->acpi_op_add) - status = acpi_add_single_object(&child, chandle, type, - ops); - else - status = acpi_bus_get_device(chandle, &child); + if (!*return_value) + *return_value = device; + return AE_OK; +} - if (ACPI_FAILURE(status)) - continue; +static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops, + struct acpi_device **child) +{ + acpi_status status; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + void *device = NULL; - if (ops->acpi_op_start && !(ops->acpi_op_add)) { - status = acpi_start_single_object(child); - if (ACPI_FAILURE(status)) - continue; - } + acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + printk(KERN_INFO PREFIX "Enumerating devices from [%s]\n", + (char *) buffer.pointer); - /* - * If the device is present, enabled, and functioning then - * parse its scope (depth-first). Note that we need to - * represent absent devices to facilitate PnP notifications - * -- but only the subtree head (not all of its children, - * which will be enumerated when the parent is inserted). - * - * TBD: Need notifications and other detection mechanisms - * in place before we can fully implement this. - */ - /* - * When the device is not present but functional, it is also - * necessary to scan the children of this device. - */ - if (child->status.present || (!child->status.present && - child->status.functional)) { - status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, - NULL, NULL); - if (ACPI_SUCCESS(status)) { - level++; - phandle = chandle; - chandle = NULL; - parent = child; - } - } - } + status = acpi_bus_check_add(handle, 0, ops, &device); + if (ACPI_SUCCESS(status)) + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_check_add, ops, &device); + if (child) + *child = device; return 0; } @@ -1471,33 +1440,25 @@ int acpi_bus_add(struct acpi_device **child, struct acpi_device *parent, acpi_handle handle, int type) { - int result; struct acpi_bus_ops ops; memset(&ops, 0, sizeof(ops)); ops.acpi_op_add = 1; - result = acpi_add_single_object(child, handle, type, &ops); - if (!result) - result = acpi_bus_scan((*child)->handle, &ops); - - return result; + acpi_bus_scan(handle, &ops, child); + return 0; } EXPORT_SYMBOL(acpi_bus_add); int acpi_bus_start(struct acpi_device *device) { - int result; struct acpi_bus_ops ops; memset(&ops, 0, sizeof(ops)); ops.acpi_op_start = 1; - result = acpi_start_single_object(device); - if (!result) - result = acpi_bus_scan(device->handle, &ops); - - return result; + acpi_bus_scan(device->handle, &ops, NULL); + return 0; } EXPORT_SYMBOL(acpi_bus_start); @@ -1600,17 +1561,9 @@ int __init acpi_scan_init(void) } /* - * Create the root device in the bus's device tree - */ - result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT, - ACPI_BUS_TYPE_DEVICE, &ops); - if (result) - goto Done; - - /* * Enumerate devices in the ACPI namespace. */ - result = acpi_bus_scan(acpi_root->handle, &ops); + result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root); if (!result) result = acpi_bus_scan_fixed(); @@ -1618,6 +1571,5 @@ int __init acpi_scan_init(void) if (result) acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); -Done: return result; }