From patchwork Tue Jul 30 19:24:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13747809 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 26E5E189B97; Tue, 30 Jul 2024 19:25:04 +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=1722367506; cv=none; b=NCFyFESKOe8qVJaQzxzH6ueQUN1TI3RbtqwveAyqfBdonO7LdL2p3uaSdCDAdukuyfFV17WXeNi/vk6GGLzncOsfZp27DUJqW4TETDMmpcLeVOZRG3iPcC6BDSBuwEYAhpjdvi+8Jl9IOWxSPVs71TQtfZ1FgRvBqh0hrqqJP+c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722367506; c=relaxed/simple; bh=SMwuI++WDdWUu7eCGhGJabbU9UQdQZM6IqiYwy2zG3k=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=md3zl5NTB7zCqQ+n0rYQ33+7iHBxr7bC07lD8r4LZt3Y9dLuTq/7jBv9qU2DIzGL4+mbXxIrBCU4RACOv2PcgMYqEA+MVHe1bIIMDN8rEJKs2L+og/TmAEBWwslsNWgQN0q5Y0sTlcAJbkKSSf4pRU9cFogzaZxfkU/97pp1y+M= 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 4.98) (envelope-from ) id 1sYsSp-000000003CL-0AsN; Tue, 30 Jul 2024 19:24:51 +0000 Date: Tue, 30 Jul 2024 20:24:47 +0100 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jens Axboe , Daniel Golle , Christian Brauner , Al Viro , Li Lingfeng , Ming Lei , Christian Heusel , =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= , Felix Fietkau , John Crispin , Chad Monroe , Yangyu Chen , Tianling Shen , Chuanhong Guo , Chen Minqiang , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH v5 1/4] dt-bindings: block: add basic bindings for block devices Message-ID: <8b6d5fadd6304cbd99672deb950cd7ff3e7c4ce0.1722365899.git.daniel@makrotopia.org> References: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Add bindings for block devices and partitions which are used to allow referencing nvmem bits on them. Signed-off-by: Daniel Golle --- .../bindings/block/block-device.yaml | 22 ++++++++ .../devicetree/bindings/block/partition.yaml | 51 +++++++++++++++++++ .../devicetree/bindings/block/partitions.yaml | 20 ++++++++ 3 files changed, 93 insertions(+) create mode 100644 Documentation/devicetree/bindings/block/block-device.yaml create mode 100644 Documentation/devicetree/bindings/block/partition.yaml create mode 100644 Documentation/devicetree/bindings/block/partitions.yaml diff --git a/Documentation/devicetree/bindings/block/block-device.yaml b/Documentation/devicetree/bindings/block/block-device.yaml new file mode 100644 index 0000000000000..c83ea525650ba --- /dev/null +++ b/Documentation/devicetree/bindings/block/block-device.yaml @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/block/block-device.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: block storage device + +description: | + This binding is generic and describes a block-oriented storage device. + +maintainers: + - Daniel Golle + +properties: + partitions: + $ref: /schemas/block/partitions.yaml + + nvmem-layout: + $ref: /schemas/nvmem/layouts/nvmem-layout.yaml# + +unevaluatedProperties: false diff --git a/Documentation/devicetree/bindings/block/partition.yaml b/Documentation/devicetree/bindings/block/partition.yaml new file mode 100644 index 0000000000000..86b61e30f9a41 --- /dev/null +++ b/Documentation/devicetree/bindings/block/partition.yaml @@ -0,0 +1,51 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/block/partition.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Partition on a block device + +description: | + This binding describes a partition on a block device. + Partitions may be matched by a combination of partition number, name, + and UUID. + +maintainers: + - Daniel Golle + +properties: + $nodename: + pattern: '^block-partition-.+$' + + partnum: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Matches partition by number if present. + + partname: + $ref: /schemas/types.yaml#/definitions/string + description: + Matches partition by PARTNAME if present. + + partuuid: + $ref: /schemas/types.yaml#/definitions/string + description: + Matches partition by PARTUUID if present. + + nvmem-layout: + $ref: /schemas/nvmem/layouts/nvmem-layout.yaml# + description: + This container may reference an NVMEM layout parser. + +anyOf: + - required: + - partnum + + - required: + - partname + + - required: + - partuuid + +unevaluatedProperties: false diff --git a/Documentation/devicetree/bindings/block/partitions.yaml b/Documentation/devicetree/bindings/block/partitions.yaml new file mode 100644 index 0000000000000..fd84c3ba8493b --- /dev/null +++ b/Documentation/devicetree/bindings/block/partitions.yaml @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/block/partitions.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Partitions on block devices + +description: | + This binding is generic and describes the content of the partitions container + node. + +maintainers: + - Daniel Golle + +patternProperties: + "^block-partition-.+$": + $ref: partition.yaml + +unevaluatedProperties: false From patchwork Tue Jul 30 19:25:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13747816 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 20E441AA3C5; Tue, 30 Jul 2024 19:26:13 +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=1722367575; cv=none; b=W4fCVymt2qaY/UaMRZRJSFZkiEm/qoRYUxqmAfgAWiaEdYMot7SmwlZJ0kS1q1gvTquOQSBOgmgHiRzTcJd3GYuDktGMnp8p4np0aW134w75Q9WDiWZ1P1/tqAQl+01m79Ry8h09AKErkmbVgzsbULXw5p9eFsaVAjX2X9F5+vc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722367575; c=relaxed/simple; bh=Vqr43TWMp2ey/8RIG6AR6Moccf1jabXlNXNjAQhYzso=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; 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Signed-off-by: Daniel Golle --- block/partitions/core.c | 72 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) diff --git a/block/partitions/core.c b/block/partitions/core.c index ab76e64f0f6c3..cd54300e1d621 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 +283,74 @@ 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 +425,8 @@ 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); From patchwork Tue Jul 30 19:26:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13747817 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 F1EEE1AA3C5; 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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 4.98) (envelope-from ) id 1sYsUg-000000003EJ-1BpC; Tue, 30 Jul 2024 19:26:46 +0000 Date: Tue, 30 Jul 2024 20:26:42 +0100 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jens Axboe , Daniel Golle , Christian Brauner , Al Viro , Li Lingfeng , Ming Lei , Christian Heusel , =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= , Felix Fietkau , John Crispin , Chad Monroe , Yangyu Chen , Tianling Shen , Chuanhong Guo , Chen Minqiang , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH v5 3/4] block: add support for notifications Message-ID: References: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Add notifier block to notify other subsystems about the addition or removal of block devices. Signed-off-by: Daniel Golle --- block/Kconfig | 6 +++ block/Makefile | 1 + block/blk-notify.c | 87 ++++++++++++++++++++++++++++++++++++++++++ include/linux/blkdev.h | 11 ++++++ 4 files changed, 105 insertions(+) create mode 100644 block/blk-notify.c diff --git a/block/Kconfig b/block/Kconfig index 5b623b876d3b4..67cd4f92378af 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -209,6 +209,12 @@ config BLK_INLINE_ENCRYPTION_FALLBACK by falling back to the kernel crypto API when inline encryption hardware is not present. +config BLOCK_NOTIFIERS + bool "Enable support for notifications in block layer" + help + Enable this option to provide notifiers for other subsystems + upon addition or removal of block devices. + source "block/partitions/Kconfig" config BLK_MQ_PCI diff --git a/block/Makefile b/block/Makefile index ddfd21c1a9ffc..a131fa7d6b26e 100644 --- a/block/Makefile +++ b/block/Makefile @@ -38,3 +38,4 @@ obj-$(CONFIG_BLK_INLINE_ENCRYPTION) += blk-crypto.o blk-crypto-profile.o \ blk-crypto-sysfs.o obj-$(CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK) += blk-crypto-fallback.o obj-$(CONFIG_BLOCK_HOLDER_DEPRECATED) += holder.o +obj-$(CONFIG_BLOCK_NOTIFIERS) += blk-notify.o diff --git a/block/blk-notify.c b/block/blk-notify.c new file mode 100644 index 0000000000000..fd727288ea19a --- /dev/null +++ b/block/blk-notify.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Notifiers for addition and removal of block devices + * + * Copyright (c) 2024 Daniel Golle + */ + +#include +#include +#include + +#include "blk.h" + +struct blk_device_list { + struct device *dev; + struct list_head list; +}; + +static RAW_NOTIFIER_HEAD(blk_notifier_list); +static DEFINE_MUTEX(blk_notifier_lock); +static LIST_HEAD(blk_devices); + +void blk_register_notify(struct notifier_block *nb) +{ + struct blk_device_list *existing_blkdev; + + mutex_lock(&blk_notifier_lock); + raw_notifier_chain_register(&blk_notifier_list, nb); + + list_for_each_entry(existing_blkdev, &blk_devices, list) + nb->notifier_call(nb, BLK_DEVICE_ADD, existing_blkdev->dev); + + mutex_unlock(&blk_notifier_lock); +} +EXPORT_SYMBOL_GPL(blk_register_notify); + +void blk_unregister_notify(struct notifier_block *nb) +{ + mutex_lock(&blk_notifier_lock); + raw_notifier_chain_unregister(&blk_notifier_list, nb); + mutex_unlock(&blk_notifier_lock); +} +EXPORT_SYMBOL_GPL(blk_unregister_notify); + +static int blk_call_notifier_add(struct device *dev) +{ + struct blk_device_list *new_blkdev; + + new_blkdev = kmalloc(sizeof(*new_blkdev), GFP_KERNEL); + if (!new_blkdev) + return -ENOMEM; + + new_blkdev->dev = dev; + mutex_lock(&blk_notifier_lock); + list_add_tail(&new_blkdev->list, &blk_devices); + raw_notifier_call_chain(&blk_notifier_list, BLK_DEVICE_ADD, dev); + mutex_unlock(&blk_notifier_lock); + return 0; +} + +static void blk_call_notifier_remove(struct device *dev) +{ + struct blk_device_list *old_blkdev, *tmp; + + mutex_lock(&blk_notifier_lock); + list_for_each_entry_safe(old_blkdev, tmp, &blk_devices, list) { + if (old_blkdev->dev != dev) + continue; + + list_del(&old_blkdev->list); + kfree(old_blkdev); + } + raw_notifier_call_chain(&blk_notifier_list, BLK_DEVICE_REMOVE, dev); + mutex_unlock(&blk_notifier_lock); +} + +static struct class_interface blk_notifications_bus_interface __refdata = { + .class = &block_class, + .add_dev = &blk_call_notifier_add, + .remove_dev = &blk_call_notifier_remove, +}; + +static int __init blk_notifications_init(void) +{ + return class_interface_register(&blk_notifications_bus_interface); +} +device_initcall(blk_notifications_init); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index e85ec73a07d57..2f871158d2860 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1682,4 +1682,15 @@ static inline bool bdev_can_atomic_write(struct block_device *bdev) #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { } + +#define BLK_DEVICE_ADD 1 +#define BLK_DEVICE_REMOVE 2 +#if defined(CONFIG_BLOCK_NOTIFIERS) +void blk_register_notify(struct notifier_block *nb); +void blk_unregister_notify(struct notifier_block *nb); +#else +static inline void blk_register_notify(struct notifier_block *nb) { }; +static inline void blk_unregister_notify(struct notifier_block *nb) { }; +#endif + #endif /* _LINUX_BLKDEV_H */ From patchwork Tue Jul 30 19:27:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13747818 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 F1D8918B473; Tue, 30 Jul 2024 19:27:17 +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=1722367639; cv=none; b=H2zojT0S4OdwLk8YnQy7DknEpWWhN9qnSHBX6lZyEOQ8GhvL/A9ppGv7VR0UdE67aEapayjKfH2YfDDTCy94qiMMCNCZnlObYg45G536nJNa1fu2BniUvXb96969vI+md+Qxpac4qCudHqTNmANg6DynGrUbYaAdaItOVlOcURM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722367639; c=relaxed/simple; bh=L8zusH9t9xhimicb6WVbLo8ISzabexbaDpqexqASPiM=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Wk0lGV+3CCG8DogMfXe2cptbhdklRp86NiYoAsbnEcgGmUZ2nKPLCV3w/eXRZe1BRGdegFRZyCLFDHFFomcwGA3P8b4ItWPx0+SfBNCv8OIn0DWYWCY7IC1MiA2QclRG3j8xmDiuq8kR6+t1xO27RgxIaH+Fn4nzNCcigHd83yk= 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 4.98) (envelope-from ) id 1sYsV4-000000003Eu-3WXT; Tue, 30 Jul 2024 19:27:10 +0000 Date: Tue, 30 Jul 2024 20:27:07 +0100 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jens Axboe , Daniel Golle , Christian Brauner , Al Viro , Li Lingfeng , Ming Lei , Christian Heusel , =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= , Felix Fietkau , John Crispin , Chad Monroe , Yangyu Chen , Tianling Shen , Chuanhong Guo , Chen Minqiang , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH v5 4/4] block: add new genhd flag GENHD_FL_NVMEM Message-ID: <311ea569c23ce14e2896cd3b069dc494c58c49c2.1722365899.git.daniel@makrotopia.org> References: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Add new flag to destinguish block devices which may act as an NVMEM provider. Signed-off-by: Daniel Golle --- include/linux/blkdev.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 2f871158d2860..cab689851211b 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -81,11 +81,13 @@ struct partition_meta_info { * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not * scan for partitions from add_disk, and users can't add partitions manually. * + * ``GENHD_FL_NVMEM``: the block device should be considered as NVMEM provider. */ enum { GENHD_FL_REMOVABLE = 1 << 0, GENHD_FL_HIDDEN = 1 << 1, GENHD_FL_NO_PART = 1 << 2, + GENHD_FL_NVMEM = 1 << 3, }; enum {