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bootconfig: Add xbc_get_info() for the node information

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Add xbc_get_info() API which allows user to get the
number of used xbc_nodes and the size of bootconfig
data. This is also useful for checking the bootconfig
is initialized or not.

Link: https://lkml.kernel.org/r/163177340877.682366.4360676589783197627.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2021-09-16 15:23:29 +09:00 committed by Steven Rostedt (VMware)
parent bdac5c2b24
commit e306220cb7
4 changed files with 25 additions and 0 deletions
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2
include/linux/bootconfig.h
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@ -273,6 +273,8 @@ static inline int __init xbc_node_compose_key(struct xbc_node *node,
/* XBC node initializer */
int __init xbc_init(const char *buf, size_t size, const char **emsg, int *epos);
/* XBC node and size information */
int __init xbc_get_info(int *node_size, size_t *data_size);
/* XBC cleanup data structures */
void __init xbc_destroy_all(void);

1
init/main.c
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@ -450,6 +450,7 @@ static void __init setup_boot_config(void)
pr_err("Failed to parse bootconfig: %s at %d.\n",
msg, pos);
} else {
xbc_get_info(&ret, NULL);
pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
/* keys starting with "kernel." are passed via cmdline */
extra_command_line = xbc_make_cmdline("kernel");

21
lib/bootconfig.c
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@ -34,6 +34,27 @@ static int xbc_err_pos __initdata;
static int open_brace[XBC_DEPTH_MAX] __initdata;
static int brace_index __initdata;
/**
* xbc_get_info() - Get the information of loaded boot config
* node_size: A pointer to store the number of nodes.
* data_size: A pointer to store the size of bootconfig data.
*
* Get the number of used nodes in @node_size if it is not NULL,
* and the size of bootconfig data in @data_size if it is not NULL.
* Return 0 if the boot config is initialized, or return -ENODEV.
*/
int __init xbc_get_info(int *node_size, size_t *data_size)
{
if (!xbc_data)
return -ENODEV;
if (node_size)
*node_size = xbc_node_num;
if (data_size)
*data_size = xbc_data_size;
return 0;
}
static int __init xbc_parse_error(const char *msg, const char *p)
{
xbc_err_msg = msg;

1
tools/bootconfig/main.c
View File

@ -391,6 +391,7 @@ static int apply_xbc(const char *path, const char *xbc_path)
return ret;
}
printf("Apply %s to %s\n", xbc_path, path);
xbc_get_info(&ret, NULL);
printf("\tNumber of nodes: %d\n", ret);
printf("\tSize: %u bytes\n", (unsigned int)size);
printf("\tChecksum: %d\n", (unsigned int)csum);