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9778174086
While discussions are still ongoing, update the block NVMEM provider patchset to the level submitted upstream to allow testing and validation. Link: https://patchwork.kernel.org/project/linux-block/list/?series=875202 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
136 lines
4.6 KiB
Diff
136 lines
4.6 KiB
Diff
From patchwork Tue Jul 30 19:25:59 2024
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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X-Patchwork-Submitter: Daniel Golle <daniel@makrotopia.org>
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X-Patchwork-Id: 13747816
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Date: Tue, 30 Jul 2024 20:25:59 +0100
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From: Daniel Golle <daniel@makrotopia.org>
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To: Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>,
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Conor Dooley <conor+dt@kernel.org>, Jens Axboe <axboe@kernel.dk>,
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Daniel Golle <daniel@makrotopia.org>, Christian Brauner <brauner@kernel.org>,
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Al Viro <viro@zeniv.linux.org.uk>, Li Lingfeng <lilingfeng3@huawei.com>,
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Ming Lei <ming.lei@redhat.com>, Christian Heusel <christian@heusel.eu>,
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=?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
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Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
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Chad Monroe <chad.monroe@adtran.com>, Yangyu Chen <cyy@cyyself.name>,
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Tianling Shen <cnsztl@immortalwrt.org>, Chuanhong Guo <gch981213@gmail.com>,
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Chen Minqiang <ptpt52@gmail.com>, devicetree@vger.kernel.org,
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linux-kernel@vger.kernel.org, linux-block@vger.kernel.org
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Subject: [PATCH v5 2/4] block: partitions: populate fwnode
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Message-ID:
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<3051ac090ad3b3e2f5adb6b67c923261ead729a5.1722365899.git.daniel@makrotopia.org>
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References: <cover.1722365899.git.daniel@makrotopia.org>
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Precedence: bulk
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X-Mailing-List: linux-block@vger.kernel.org
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List-Id: <linux-block.vger.kernel.org>
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List-Subscribe: <mailto:linux-block+subscribe@vger.kernel.org>
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List-Unsubscribe: <mailto:linux-block+unsubscribe@vger.kernel.org>
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MIME-Version: 1.0
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Content-Disposition: inline
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In-Reply-To: <cover.1722365899.git.daniel@makrotopia.org>
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Assign matching firmware nodes to block partitions in order to allow
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them to be referenced e.g. as NVMEM providers.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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block/partitions/core.c | 72 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 72 insertions(+)
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--- a/block/partitions/core.c
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+++ b/block/partitions/core.c
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@@ -10,6 +10,8 @@
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#include <linux/ctype.h>
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#include <linux/vmalloc.h>
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#include <linux/raid/detect.h>
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+#include <linux/property.h>
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+
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#include "check.h"
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static int (*const check_part[])(struct parsed_partitions *) = {
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@@ -292,6 +294,74 @@ static ssize_t whole_disk_show(struct de
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}
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static const DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
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+static bool part_meta_match(const char *attr, const char *member, size_t length)
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+{
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+ /* check if length of attr exceeds specified maximum length */
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+ if (strnlen(attr, length) == length)
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+ return false;
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+
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+ /* return true if strings match */
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+ return !strncmp(attr, member, length);
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+}
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+
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+static struct fwnode_handle *find_partition_fwnode(struct block_device *bdev)
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+{
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+ struct fwnode_handle *fw_parts, *fw_part;
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+ struct device *ddev = disk_to_dev(bdev->bd_disk);
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+ const char *partname, *uuid;
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+ u32 partno;
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+ bool got_uuid, got_partname, got_partno;
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+
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+ fw_parts = device_get_named_child_node(ddev, "partitions");
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+ if (!fw_parts)
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+ return NULL;
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+
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+ fwnode_for_each_child_node(fw_parts, fw_part) {
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+ got_uuid = false;
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+ got_partname = false;
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+ got_partno = false;
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+ /*
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+ * In case 'uuid' is defined in the partitions firmware node
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+ * require partition meta info being present and the specified
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+ * uuid to match.
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+ */
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+ got_uuid = !fwnode_property_read_string(fw_part, "uuid", &uuid);
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+ if (got_uuid && (!bdev->bd_meta_info ||
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+ !part_meta_match(uuid, bdev->bd_meta_info->uuid,
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+ PARTITION_META_INFO_UUIDLTH)))
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+ continue;
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+
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+ /*
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+ * In case 'partname' is defined in the partitions firmware node
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+ * require partition meta info being present and the specified
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+ * volname to match.
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+ */
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+ got_partname = !fwnode_property_read_string(fw_part, "partname",
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+ &partname);
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+ if (got_partname && (!bdev->bd_meta_info ||
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+ !part_meta_match(partname,
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+ bdev->bd_meta_info->volname,
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+ PARTITION_META_INFO_VOLNAMELTH)))
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+ continue;
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+
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+ /*
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+ * In case 'partno' is defined in the partitions firmware node
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+ * the specified partno needs to match.
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+ */
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+ got_partno = !fwnode_property_read_u32(fw_part, "partno", &partno);
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+ if (got_partno && bdev->bd_partno != partno)
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+ continue;
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+
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+ /* Skip if no matching criteria is present in firmware node */
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+ if (!got_uuid && !got_partname && !got_partno)
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+ continue;
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+
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+ return fw_part;
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+ }
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+
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+ return NULL;
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+}
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+
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/*
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* Must be called either with open_mutex held, before a disk can be opened or
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* after all disk users are gone.
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@@ -374,6 +444,8 @@ static struct block_device *add_partitio
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goto out_put;
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}
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+ device_set_node(pdev, find_partition_fwnode(bdev));
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+
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/* delay uevent until 'holders' subdir is created */
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dev_set_uevent_suppress(pdev, 1);
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err = device_add(pdev);
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