78 lines
2.3 KiB
Diff
78 lines
2.3 KiB
Diff
From 614f4f6fdda09e30ecf7ef6c8091579db15018cb Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Fri, 21 Jul 2023 17:51:03 +0100
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Subject: [PATCH 09/15] block: partitions: populate fwnode
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Let block partitions to be represented by a firmware node and hence
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allow them to being referenced e.g. for use with blk-nvmem.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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block/partitions/core.c | 41 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 41 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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@@ -298,6 +300,43 @@ 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 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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+
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+ fw_parts = device_get_named_child_node(ddev, "partitions");
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+ if (!fw_parts)
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+ fw_parts = device_get_named_child_node(ddev->parent, "partitions");
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+
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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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+ if (!fwnode_property_read_string(fw_part, "uuid", &uuid) &&
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+ (!bdev->bd_meta_info || strncmp(uuid,
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+ 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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+ if (!fwnode_property_read_string(fw_part, "partname", &partname) &&
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+ (!bdev->bd_meta_info || strncmp(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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+ if (!fwnode_property_read_u32(fw_part, "partno", &partno) &&
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+ bdev->bd_partno != 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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@@ -380,6 +419,8 @@ 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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