From patchwork Thu Dec 23 08:16:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heikki Krogerus X-Patchwork-Id: 12698023 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DE18C433EF for ; Thu, 23 Dec 2021 08:16:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347074AbhLWIQV (ORCPT ); Thu, 23 Dec 2021 03:16:21 -0500 Received: from mga01.intel.com ([192.55.52.88]:28533 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239315AbhLWIQT (ORCPT ); Thu, 23 Dec 2021 03:16:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1640247379; x=1671783379; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZGjf2BsKqKmCiWOumvWShxieb989cWfWjiqvu1NglXs=; b=MPy80rf2L6+okhZooKZsS6kol3HUmSV+ppp/wj0T6TfjZ1Em3JKJkt0E JekETYww5G6HsvZCzYxlGz9RkqsTtYx7NCemLmGqIdKbVucxHs7v2n0zG wlmkqONKwNY3OhN1WBCYS1VVylVzk1E99u0TcRtOoeCg5GWRejKPEzkbO 7iPoMimD2qFm2WRu8FXBD09dza/0WopgA720tkJJia6kzKuv0JxhUM2gj qt13WxbTLvTW7ZYqjrw2dShsO6NM3TsyefYNSSfYLpWaqUdOj7DtLb2iL o9UZPF72CcMv9n3yT3zqUVH0xhq6DtzM3BrP37Sxw3nRb5ejQrC2x5OpM A==; X-IronPort-AV: E=McAfee;i="6200,9189,10206"; a="264990671" X-IronPort-AV: E=Sophos;i="5.88,228,1635231600"; d="scan'208";a="264990671" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Dec 2021 00:16:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,228,1635231600"; d="scan'208";a="664515517" Received: from black.fi.intel.com (HELO black.fi.intel.com.) ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 23 Dec 2021 00:16:17 -0800 From: Heikki Krogerus To: "Rafael J. Wysocki" , Greg Kroah-Hartman Cc: Andy Shevchenko , Sakari Ailus , Prashant Malani , linux-acpi@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 2/5] acpi: Store CRC-32 hash of the _PLD in struct acpi_device Date: Thu, 23 Dec 2021 11:16:17 +0300 Message-Id: <20211223081620.45479-3-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211223081620.45479-1-heikki.krogerus@linux.intel.com> References: <20211223081620.45479-1-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Storing CRC-32 hash of the Physical Location of Device object (_PLD) with devices that have it. The hash is stored to a new struct acpi_device member "pld_crc". The hash makes it easier to find devices that share a location, as there is no need to evaluate the entire object every time. Knowledge about devices that share a location can be used in device drivers that need to know the connections to other components inside a system. USB3 ports will for example always share their location with a USB2 port. Signed-off-by: Heikki Krogerus --- drivers/acpi/scan.c | 16 ++++++++++++++++ include/acpi/acpi_bus.h | 1 + 2 files changed, 17 insertions(+) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 7ff55a197a583..113414c46b713 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "internal.h" @@ -667,6 +668,19 @@ static int acpi_tie_acpi_dev(struct acpi_device *adev) return 0; } +static void acpi_store_pld_crc(struct acpi_device *adev) +{ + struct acpi_pld_info *pld; + acpi_status status; + + status = acpi_get_physical_device_location(adev->handle, &pld); + if (ACPI_FAILURE(status)) + return; + + adev->pld_crc = crc32(~0, pld, sizeof(*pld)); + ACPI_FREE(pld); +} + static int __acpi_device_add(struct acpi_device *device, void (*release)(struct device *)) { @@ -725,6 +739,8 @@ static int __acpi_device_add(struct acpi_device *device, if (device->wakeup.flags.valid) list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); + acpi_store_pld_crc(device); + mutex_unlock(&acpi_device_lock); if (device->parent) diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 8e87ead2af341..f8c945418df23 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -360,6 +360,7 @@ struct acpi_gpio_mapping; /* Device */ struct acpi_device { + u32 pld_crc; int device_type; acpi_handle handle; /* no handle for fixed hardware */ struct fwnode_handle fwnode;