From patchwork Tue Mar 5 20:23:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 778186 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 4665112BE8C; Tue, 5 Mar 2024 20:24:07 +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=1709670248; cv=none; b=LD/qTgf/E8iwv+E+ZLHFRD4ZxL7lQjYL93JkdqcyJ2o31s3yKOEiw044S+QSHNaEhpBHOSnNUGBghCpyeL6qFbTtzahn5KB6NMCNwze4tBNKos21eXnyh6ZURijPKBuv4HD8zySAiz1OF8gDtljX7hxjzZl4I/I6j/X6y4nsXAY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709670248; c=relaxed/simple; bh=2Quus8bwOAvZ26pD2KZKwCchqWnTAr6TMdGV+yLI5KI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=kz7IKQ1C/5iRjfqkaFF9CZhF1Ha+kvySQ+qha55NDIMVxvMBSwr4/VaEMxchLhX6x+nqgze/kL6fDjqYF/Kkr2nQWZxKM8+y1uSRXK4SH1KSWvv/OgxSxHwYBCV7S82ZD2slVP/qFbXjNVhGrpozMLHrKHD3N+vOrsEf4jM2x5Q= 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 4.96.2) (envelope-from ) id 1rhbKG-0001ND-2V; Tue, 05 Mar 2024 20:23:48 +0000 Date: Tue, 5 Mar 2024 20:23:44 +0000 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ulf Hansson , Jens Axboe , Daniel Golle , Dave Chinner , Jan Kara , Thomas =?iso-8859-1?q?Wei=DFschuh?= , Christian Brauner , Li Lingfeng , Damien Le Moal , Min Li , Adrian Hunter , Hannes Reinecke , Christian Loehle , Avri Altman , Bean Huo , Yeqi Fu , Victor Shih , Christophe JAILLET , "Ricardo B. Marliere" , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Cc: Diping Zhang , Jianhui Zhao , Jieying Zeng , Chad Monroe , Adam Fox , John Crispin Subject: [RFC PATCH v2 3/8] block: add new genhd flag GENHD_FL_NVMEM Message-ID: 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: 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 715c9201008a6..03e4b1fd5060d 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 { From patchwork Tue Mar 5 20:23:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 778185 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 80A081292C7; Tue, 5 Mar 2024 20:24:23 +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=1709670265; cv=none; b=eSelUpe/TzX/ejqYQe8tx/BXLUtUvCL8CA4k+CDt9B6r1L9OJuzbf3mwCx7gFezgfR3UZj5BjWIq9EDNcdk0azz/BuVj+8P5Ug+PXi/4gDF8KQ0D+311AIMc8QXjzh2FIbzoRBlm71w+48fP8C76hiS+bT/JaE/IqBAPzGofbq0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709670265; c=relaxed/simple; bh=iir94xWEFXfTEvOvBQYZ6cdGLKxLhVg9Jp/2Kfnbt34=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=hd/z9yRz2wO1uh3IbblZ/92/z/8qHKzM8Np14O/ON3zeGcbLsgsC0c95Wt0/OtP4P06nVu4ReZNU+OifR3mIQFi4BAKEDMWn/SISJh9qI9W+pqO1SfORSSAo2CpsURbJfjDTTIM6xBouJOQE3QeBBdSv5bDPnKwlf3XuQ7kthig= 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 4.96.2) (envelope-from ) id 1rhbKQ-0001Np-2O; Tue, 05 Mar 2024 20:23:58 +0000 Date: Tue, 5 Mar 2024 20:23:54 +0000 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ulf Hansson , Jens Axboe , Daniel Golle , Dave Chinner , Jan Kara , Thomas =?iso-8859-1?q?Wei=DFschuh?= , Christian Brauner , Li Lingfeng , Damien Le Moal , Min Li , Adrian Hunter , Hannes Reinecke , Christian Loehle , Avri Altman , Bean Huo , Yeqi Fu , Victor Shih , Christophe JAILLET , "Ricardo B. Marliere" , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Cc: Diping Zhang , Jianhui Zhao , Jieying Zeng , Chad Monroe , Adam Fox , John Crispin Subject: [RFC PATCH v2 4/8] block: implement NVMEM provider Message-ID: <6061aa4201030b9bb2f8d03ef32a564fdb786ed1.1709667858.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: On embedded devices using an eMMC it is common that one or more partitions on the eMMC are used to store MAC addresses and Wi-Fi calibration EEPROM data. Allow referencing the partition in device tree for the kernel and Wi-Fi drivers accessing it via the NVMEM layer. Signed-off-by: Daniel Golle --- block/Kconfig | 9 +++ block/Makefile | 1 + block/blk-nvmem.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 185 insertions(+) create mode 100644 block/blk-nvmem.c diff --git a/block/Kconfig b/block/Kconfig index 1de4682d48ccb..b1d4c88c70040 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -229,6 +229,15 @@ config BLK_INLINE_ENCRYPTION_FALLBACK by falling back to the kernel crypto API when inline encryption hardware is not present. +config BLK_NVMEM + bool "Block device NVMEM provider" + depends on OF + depends on NVMEM + help + Allow block devices (or partitions) to act as NVMEM prodivers, + typically used with eMMC to store MAC addresses or Wi-Fi + calibration data on embedded devices. + source "block/partitions/Kconfig" config BLK_MQ_PCI diff --git a/block/Makefile b/block/Makefile index 46ada9dc8bbfe..03c0bfa8642df 100644 --- a/block/Makefile +++ b/block/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_BLK_DEV_ZONED) += blk-zoned.o obj-$(CONFIG_BLK_WBT) += blk-wbt.o obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o +obj-$(CONFIG_BLK_NVMEM) += blk-nvmem.o obj-$(CONFIG_BLK_SED_OPAL) += sed-opal.o obj-$(CONFIG_BLK_PM) += blk-pm.o obj-$(CONFIG_BLK_INLINE_ENCRYPTION) += blk-crypto.o blk-crypto-profile.o \ diff --git a/block/blk-nvmem.c b/block/blk-nvmem.c new file mode 100644 index 0000000000000..6deb2f251d813 --- /dev/null +++ b/block/blk-nvmem.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * block device NVMEM provider + * + * Copyright (c) 2024 Daniel Golle + * + * Useful on devices using a partition on an eMMC for MAC addresses or + * Wi-Fi calibration EEPROM data. + */ + +#include "blk.h" +#include +#include +#include +#include + +/* List of all NVMEM devices */ +static LIST_HEAD(nvmem_devices); +static DEFINE_MUTEX(devices_mutex); + +struct blk_nvmem { + struct nvmem_device *nvmem; + struct device *dev; + struct list_head list; +}; + +static int blk_nvmem_reg_read(void *priv, unsigned int from, + void *val, size_t bytes) +{ + blk_mode_t mode = BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES; + unsigned long offs = from & ~PAGE_MASK, to_read; + pgoff_t f_index = from >> PAGE_SHIFT; + struct blk_nvmem *bnv = priv; + size_t bytes_left = bytes; + struct file *bdev_file; + struct folio *folio; + void *p; + int ret = 0; + + bdev_file = bdev_file_open_by_dev(bnv->dev->devt, mode, priv, NULL); + if (!bdev_file) + return -ENODEV; + + if (IS_ERR(bdev_file)) + return PTR_ERR(bdev_file); + + while (bytes_left) { + folio = read_mapping_folio(bdev_file->f_mapping, f_index++, NULL); + if (IS_ERR(folio)) { + ret = PTR_ERR(folio); + goto err_release_bdev; + } + to_read = min_t(unsigned long, bytes_left, PAGE_SIZE - offs); + p = folio_address(folio) + offset_in_folio(folio, offs); + memcpy(val, p, to_read); + offs = 0; + bytes_left -= to_read; + val += to_read; + folio_put(folio); + } + +err_release_bdev: + fput(bdev_file); + + return ret; +} + +static int blk_nvmem_register(struct device *dev) +{ + struct device_node *np = dev_of_node(dev); + struct block_device *bdev = dev_to_bdev(dev); + struct nvmem_config config = {}; + struct blk_nvmem *bnv; + + /* skip devices which do not have a device tree node */ + if (!np) + return 0; + + /* skip devices without an nvmem layout defined */ + if (!of_get_child_by_name(np, "nvmem-layout")) + return 0; + + /* + * skip devices which don't have GENHD_FL_NVMEM set + * + * This flag is used for mtdblock and ubiblock devices because + * both, MTD and UBI already implement their own NVMEM provider. + * To avoid registering multiple NVMEM providers for the same + * device node, don't register the block NVMEM provider for them. + */ + if (!(bdev->bd_disk->flags & GENHD_FL_NVMEM)) + return 0; + + /* + * skip block device too large to be represented as NVMEM devices + * which are using an 'int' as address + */ + if (bdev_nr_bytes(bdev) > INT_MAX) + return -EFBIG; + + bnv = kzalloc(sizeof(struct blk_nvmem), GFP_KERNEL); + if (!bnv) + return -ENOMEM; + + config.id = NVMEM_DEVID_NONE; + config.dev = &bdev->bd_device; + config.name = dev_name(&bdev->bd_device); + config.owner = THIS_MODULE; + config.priv = bnv; + config.reg_read = blk_nvmem_reg_read; + config.size = bdev_nr_bytes(bdev); + config.word_size = 1; + config.stride = 1; + config.read_only = true; + config.root_only = true; + config.ignore_wp = true; + config.of_node = to_of_node(dev->fwnode); + + bnv->dev = &bdev->bd_device; + bnv->nvmem = nvmem_register(&config); + if (IS_ERR(bnv->nvmem)) { + dev_err_probe(&bdev->bd_device, PTR_ERR(bnv->nvmem), + "Failed to register NVMEM device\n"); + + kfree(bnv); + return PTR_ERR(bnv->nvmem); + } + + mutex_lock(&devices_mutex); + list_add_tail(&bnv->list, &nvmem_devices); + mutex_unlock(&devices_mutex); + + return 0; +} + +static void blk_nvmem_unregister(struct device *dev) +{ + struct blk_nvmem *bnv_c, *bnv = NULL; + + mutex_lock(&devices_mutex); + list_for_each_entry(bnv_c, &nvmem_devices, list) { + if (bnv_c->dev == dev) { + bnv = bnv_c; + break; + } + } + + if (!bnv) { + mutex_unlock(&devices_mutex); + return; + } + + list_del(&bnv->list); + mutex_unlock(&devices_mutex); + nvmem_unregister(bnv->nvmem); + kfree(bnv); +} + +static struct class_interface blk_nvmem_bus_interface __refdata = { + .class = &block_class, + .add_dev = &blk_nvmem_register, + .remove_dev = &blk_nvmem_unregister, +}; + +static int __init blk_nvmem_init(void) +{ + int ret; + + ret = class_interface_register(&blk_nvmem_bus_interface); + if (ret) + return ret; + + return 0; +} +device_initcall(blk_nvmem_init); From patchwork Tue Mar 5 20:24:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 778184 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 4C6F212AAD1; Tue, 5 Mar 2024 20:24:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.96.2) (envelope-from ) id 1rhbKp-0001Q6-2t; Tue, 05 Mar 2024 20:24:24 +0000 Date: Tue, 5 Mar 2024 20:24:19 +0000 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ulf Hansson , Jens Axboe , Daniel Golle , Dave Chinner , Jan Kara , Thomas =?iso-8859-1?q?Wei=DFschuh?= , Christian Brauner , Li Lingfeng , Damien Le Moal , Min Li , Adrian Hunter , Hannes Reinecke , Christian Loehle , Avri Altman , Bean Huo , Yeqi Fu , Victor Shih , Christophe JAILLET , "Ricardo B. Marliere" , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Cc: Diping Zhang , Jianhui Zhao , Jieying Zeng , Chad Monroe , Adam Fox , John Crispin Subject: [RFC PATCH v2 6/8] mmc: core: set card fwnode_handle Message-ID: <055787bb6085c32907ee1772522a6bfa49d5d2ef.1709667858.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: Set fwnode in case it isn't set yet and of_node is present. Signed-off-by: Daniel Golle --- drivers/mmc/core/bus.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c index 0ddaee0eae54f..e1c5fc1b3ce4b 100644 --- a/drivers/mmc/core/bus.c +++ b/drivers/mmc/core/bus.c @@ -364,6 +364,8 @@ int mmc_add_card(struct mmc_card *card) mmc_add_card_debugfs(card); card->dev.of_node = mmc_of_find_child_device(card->host, 0); + if (card->dev.of_node && !card->dev.fwnode) + card->dev.fwnode = &card->dev.of_node->fwnode; device_enable_async_suspend(&card->dev); From patchwork Tue Mar 5 20:24:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 778183 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 30366128827; Tue, 5 Mar 2024 20:25:09 +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=1709670310; cv=none; b=ogALKf8LZCo7KOSlHJD5Ll1Mhzq3q9h7GptVcwt5KwjP+DkNSiblixy+pPVgl/Dj3bw1JqT86EadRCpeWkOoEw59B7C1bd0TdSfQA4Lbw9TazKIkgsGfHeVLZZD2cexqRsBYl4VsLgXNFeugCSSp8/h8Y4Tq2wujwVoVkyySifY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709670310; c=relaxed/simple; bh=eCjR4mfI+AWqQXtiUhJgIvBVLRaJmzjFD41b5wteOLw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=NOQxzJ13L3u6Ctjztg8a5cgljYI6fbMWGK3C2aLg9joNSstBwurujTaiTyZ4xZmyv6Eg1U5UocAtrSI+lpKMyGEdXLCaFegLZ+6YPTNSW0fwx2Ofg60XQVCRs+Wt3AruFjURTQOMgLP03VOnQLXrcK40S59fEd+rAcsa1mf4arw= 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 4.96.2) (envelope-from ) id 1rhbLB-0001S5-24; Tue, 05 Mar 2024 20:24:45 +0000 Date: Tue, 5 Mar 2024 20:24:41 +0000 From: Daniel Golle To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ulf Hansson , Jens Axboe , Daniel Golle , Dave Chinner , Jan Kara , Thomas =?iso-8859-1?q?Wei=DFschuh?= , Christian Brauner , Li Lingfeng , Damien Le Moal , Min Li , Adrian Hunter , Hannes Reinecke , Christian Loehle , Avri Altman , Bean Huo , Yeqi Fu , Victor Shih , Christophe JAILLET , "Ricardo B. Marliere" , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Cc: Diping Zhang , Jianhui Zhao , Jieying Zeng , Chad Monroe , Adam Fox , John Crispin Subject: [RFC PATCH v2 8/8] mmc: block: set GENHD_FL_NVMEM Message-ID: <9315d06c7b286af445ff32e4db2e7a8c1c2d6ea4.1709667858.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: Set flag to consider MMC block devices as NVMEM providers. Signed-off-by: Daniel Golle --- drivers/mmc/core/block.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index c3e9477743515..8cd0400c9887d 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2514,6 +2514,7 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, md->disk->major = MMC_BLOCK_MAJOR; md->disk->minors = perdev_minors; md->disk->first_minor = devidx * perdev_minors; + md->disk->flags = GENHD_FL_NVMEM; md->disk->fops = &mmc_bdops; md->disk->private_data = md; md->parent = parent;