summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMasami Hiramatsu <mhiramat@kernel.org>2021-09-16 09:23:29 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-10-11 03:43:53 +0300
commite306220cb7b7c2948f191414ab06851e143b54c1 (patch)
treeba1934544e721a548cc94935c1a4878cec050739
parentbdac5c2b243f68ec15f8203c3348ae79fee8e8d8 (diff)
downloadlinux-e306220cb7b7c2948f191414ab06851e143b54c1.tar.xz
bootconfig: Add xbc_get_info() for the node information
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>
-rw-r--r--include/linux/bootconfig.h2
-rw-r--r--init/main.c1
-rw-r--r--lib/bootconfig.c21
-rw-r--r--tools/bootconfig/main.c1
4 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/bootconfig.h b/include/linux/bootconfig.h
index 62e09b788172..f955bb7eabbb 100644
--- a/include/linux/bootconfig.h
+++ b/include/linux/bootconfig.h
@@ -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);
diff --git a/init/main.c b/init/main.c
index d894989d86bc..afaed805de19 100644
--- a/init/main.c
+++ b/init/main.c
@@ -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");
diff --git a/lib/bootconfig.c b/lib/bootconfig.c
index 66b02fddfea8..b088fe5c0001 100644
--- a/lib/bootconfig.c
+++ b/lib/bootconfig.c
@@ -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;
diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
index 7269c9e35335..4f2a8d884745 100644
--- a/tools/bootconfig/main.c
+++ b/tools/bootconfig/main.c
@@ -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);