From patchwork Thu Jun 27 20:50:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13715026 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) (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 0E0774EB37; Thu, 27 Jun 2024 20:50:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.142.180.65 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719521457; cv=none; b=PvixhZ68tK5NarHbnByLDGWj0EFOCkYzASWYQomcMBaqs5uFeobyE5Taw7rimPAA/gHoHjC9GFQHzZMEnQFGdS9Jt6iy73bvj6Qw8VCyPOZgIUxDYz4MRqJyjn6qEYZySB9MFPU5xCmWYxXJT7gUAM8m3E2JA69U/wLWaVPjRcU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719521457; c=relaxed/simple; bh=XSkZ8Rhleru2ig5e7eYcbAjIsYDSQDyob39l0dJdjYg=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=eOye3So3DRo5MdAk7TjpyuIlcUM8pGuVajVCTg3m5x15fZpLv9JO8fR4/Vcsq8R8EWmPOdO2Ekh/TYiUR0JLBHZL3M4SZld9JDk3nsvM203bB/baRCMH7oxQnruC22oqA6t3aTKS5jbRcxXQqU2gvGBVcMq5LFw+PIqdQP1K5ec= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org; spf=pass smtp.mailfrom=makrotopia.org; arc=none smtp.client-ip=185.142.180.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.97.1) (envelope-from ) id 1sMw4q-000000007lU-0S0c; Thu, 27 Jun 2024 20:50:44 +0000 Date: Thu, 27 Jun 2024 21:50:39 +0100 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ulf Hansson , Jens Axboe , Hauke Mehrtens , Felix Fietkau , Srinivas Kandagatla , Daniel Golle , Dave Chinner , Jan Kara , Christian Brauner , Thomas =?iso-8859-1?q?Wei=DFschuh?= , Al Viro , Li Lingfeng , Christian Heusel , Min Li , Avri Altman , Adrian Hunter , Hannes Reinecke , Mikko Rapeli , Yeqi Fu , Victor Shih , Christophe JAILLET , Li Zhijian , "Ricardo B. Marliere" , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH v4 2/4] block: partitions: populate fwnode Message-ID: <6acc459a392d562abc58f7e55c6f04dba8073257.1719520771.git.daniel@makrotopia.org> References: Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Let block partitions to be represented by a firmware node and hence allow them to being referenced e.g. for use with blk-nvmem. Signed-off-by: Daniel Golle --- block/partitions/core.c | 70 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/block/partitions/core.c b/block/partitions/core.c index ab76e64f0f6c..edf582de741f 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -10,6 +10,8 @@ #include #include #include +#include + #include "check.h" static int (*const check_part[])(struct parsed_partitions *) = { @@ -281,6 +283,72 @@ static ssize_t whole_disk_show(struct device *dev, } static const DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); +static bool part_meta_match(const char *attr, const char *member, size_t length) +{ + /* check if length of attr exceeds specified maximum length */ + if (strnlen(attr, length) == length) + return false; + + /* return true if strings match */ + return !strncmp(attr, member, length); +} + +static struct fwnode_handle *find_partition_fwnode(struct block_device *bdev) +{ + struct fwnode_handle *fw_parts, *fw_part; + struct device *ddev = disk_to_dev(bdev->bd_disk); + const char *partname, *uuid; + u32 partno; + bool got_uuid, got_partname, got_partno; + + fw_parts = device_get_named_child_node(ddev, "partitions"); + if (!fw_parts) + return NULL; + + fwnode_for_each_child_node(fw_parts, fw_part) { + got_uuid = false; + got_partname = false; + got_partno = false; + /* + * In case 'uuid' is defined in the partitions firmware node require + * partition meta info being present and the specified uuid to match. + */ + got_uuid = !fwnode_property_read_string(fw_part, "uuid", &uuid); + if (got_uuid && (!bdev->bd_meta_info || + !part_meta_match(uuid, bdev->bd_meta_info->uuid, + PARTITION_META_INFO_UUIDLTH))) + continue; + + /* + * In case 'partname' is defined in the partitions firmware node require + * partition meta info being present and the specified volname to match. + */ + got_partname = !fwnode_property_read_string(fw_part, "partname", + &partname); + if (got_partname && (!bdev->bd_meta_info || + !part_meta_match(partname, + bdev->bd_meta_info->volname, + PARTITION_META_INFO_VOLNAMELTH))) + continue; + + /* + * In case 'partno' is defined in the partitions firmware node the + * specified partno needs to match. + */ + got_partno = !fwnode_property_read_u32(fw_part, "partno", &partno); + if (got_partno && bdev_partno(bdev) != partno) + continue; + + /* Skip if no matching criteria is present in firmware node */ + if (!got_uuid && !got_partname && !got_partno) + continue; + + return fw_part; + } + + return NULL; +} + /* * Must be called either with open_mutex held, before a disk can be opened or * after all disk users are gone. @@ -355,6 +423,8 @@ static struct block_device *add_partition(struct gendisk *disk, int partno, goto out_put; } + device_set_node(pdev, find_partition_fwnode(bdev)); + /* delay uevent until 'holders' subdir is created */ dev_set_uevent_suppress(pdev, 1); err = device_add(pdev);