From patchwork Mon Dec 5 23:25:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 9461709 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C048D60231 for ; Mon, 5 Dec 2016 23:25:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B4959281E1 for ; Mon, 5 Dec 2016 23:25:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A93DD282F5; Mon, 5 Dec 2016 23:25:32 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 59718281E1 for ; Mon, 5 Dec 2016 23:25:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751515AbcLEXZb (ORCPT ); Mon, 5 Dec 2016 18:25:31 -0500 Received: from mail.kernel.org ([198.145.29.136]:39492 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751427AbcLEXZb (ORCPT ); Mon, 5 Dec 2016 18:25:31 -0500 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8BB892035B; Mon, 5 Dec 2016 23:25:29 +0000 (UTC) Received: from localhost (unknown [69.71.4.155]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0CA642034F; Mon, 5 Dec 2016 23:25:28 +0000 (UTC) Subject: [PATCH v11 01/15] ACPI: Add acpi_resource_consumer() to find device that claims a resource From: Bjorn Helgaas To: linux-pci@vger.kernel.org Cc: Lorenzo Pieralisi , Gabriele Paoloni , "Rafael J. Wysocki" , Tomasz Nowicki , Duc Dang , Sinan Kaya , Christopher Covington , Dongdong Liu Date: Mon, 05 Dec 2016 17:25:27 -0600 Message-ID: <20161205232526.3957.81144.stgit@bhelgaas-glaptop.roam.corp.google.com> In-Reply-To: <20161205232117.3957.50546.stgit@bhelgaas-glaptop.roam.corp.google.com> References: <20161205232117.3957.50546.stgit@bhelgaas-glaptop.roam.corp.google.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Bjorn Helgaas Add acpi_resource_consumer(). This takes a struct resource and searches the ACPI namespace for a device whose current resource settings (_CRS) includes the resource. It returns the device if it exists, or NULL if no device uses the resource. If more than one device uses the resource (this may happen in the case of bridges), acpi_resource_consumer() returns the first one found by acpi_get_devices() in its modified depth-first walk of the namespace. Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki --- drivers/acpi/resource.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 7 ++++++ 2 files changed, 64 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" 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/resource.c b/drivers/acpi/resource.c index 56241eb..cb57962 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -664,3 +664,60 @@ int acpi_dev_filter_resource_type(struct acpi_resource *ares, return (type & types) ? 0 : 1; } EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type); + +static int acpi_dev_consumes_res(struct acpi_device *adev, struct resource *res) +{ + struct list_head resource_list; + struct resource_entry *rentry; + int ret, found = 0; + + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); + if (ret < 0) + return 0; + + list_for_each_entry(rentry, &resource_list, node) { + if (resource_contains(rentry->res, res)) { + found = 1; + break; + } + + } + + acpi_dev_free_resource_list(&resource_list); + return found; +} + +static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth, + void *context, void **ret) +{ + struct resource *res = context; + struct acpi_device **consumer = (struct acpi_device **) ret; + struct acpi_device *adev; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + if (acpi_dev_consumes_res(adev, res)) { + *consumer = adev; + return AE_CTRL_TERMINATE; + } + + return AE_OK; +} + +/** + * acpi_resource_consumer - Find the ACPI device that consumes @res. + * @res: Resource to search for. + * + * Search the current resource settings (_CRS) of every ACPI device node + * for @res. If we find an ACPI device whose _CRS includes @res, return + * it. Otherwise, return NULL. + */ +struct acpi_device *acpi_resource_consumer(struct resource *res) +{ + struct acpi_device *consumer = NULL; + + acpi_get_devices(NULL, acpi_res_consumer_cb, res, (void **) &consumer); + return consumer; +} diff --git a/include/linux/acpi.h b/include/linux/acpi.h index ddbeda6..b00ad73 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -419,6 +419,8 @@ static inline int acpi_dev_filter_resource_type_cb(struct acpi_resource *ares, return acpi_dev_filter_resource_type(ares, (unsigned long)arg); } +struct acpi_device *acpi_resource_consumer(struct resource *res); + int acpi_check_resource_conflict(const struct resource *res); int acpi_check_region(resource_size_t start, resource_size_t n, @@ -762,6 +764,11 @@ static inline int acpi_reconfig_notifier_unregister(struct notifier_block *nb) return -EINVAL; } +static inline struct acpi_device *acpi_resource_consumer(struct resource *res) +{ + return NULL; +} + #endif /* !CONFIG_ACPI */ #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC