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- From 614f4f6fdda09e30ecf7ef6c8091579db15018cb Mon Sep 17 00:00:00 2001
- From: Daniel Golle <[email protected]>
- Date: Fri, 21 Jul 2023 17:51:03 +0100
- Subject: [PATCH 09/15] block: partitions: populate fwnode
- 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 <[email protected]>
- ---
- block/partitions/core.c | 41 +++++++++++++++++++++++++++++++++++++++++
- 1 file changed, 41 insertions(+)
- --- a/block/partitions/core.c
- +++ b/block/partitions/core.c
- @@ -10,6 +10,8 @@
- #include <linux/ctype.h>
- #include <linux/vmalloc.h>
- #include <linux/raid/detect.h>
- +#include <linux/property.h>
- +
- #include "check.h"
-
- static int (*const check_part[])(struct parsed_partitions *) = {
- @@ -292,6 +294,43 @@ static ssize_t whole_disk_show(struct de
- }
- static const DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
-
- +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;
- +
- + fw_parts = device_get_named_child_node(ddev, "partitions");
- + if (!fw_parts)
- + fw_parts = device_get_named_child_node(ddev->parent, "partitions");
- +
- + if (!fw_parts)
- + return NULL;
- +
- + fwnode_for_each_child_node(fw_parts, fw_part) {
- + if (!fwnode_property_read_string(fw_part, "uuid", &uuid) &&
- + (!bdev->bd_meta_info || strncmp(uuid,
- + bdev->bd_meta_info->uuid,
- + PARTITION_META_INFO_UUIDLTH)))
- + continue;
- +
- + if (!fwnode_property_read_string(fw_part, "partname", &partname) &&
- + (!bdev->bd_meta_info || strncmp(partname,
- + bdev->bd_meta_info->volname,
- + PARTITION_META_INFO_VOLNAMELTH)))
- + continue;
- +
- + if (!fwnode_property_read_u32(fw_part, "partno", &partno) &&
- + bdev->bd_partno != 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.
- @@ -374,6 +413,8 @@ static struct block_device *add_partitio
- 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);
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