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Diffstat (limited to 'lib/dynamic_debug.c')
-rw-r--r--lib/dynamic_debug.c60
1 files changed, 26 insertions, 34 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index cb5abb42c16a..dd7f56af9aed 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -71,6 +71,8 @@ static DEFINE_MUTEX(ddebug_lock);
static LIST_HEAD(ddebug_tables);
static int verbose;
module_param(verbose, int, 0644);
+MODULE_PARM_DESC(verbose, " dynamic_debug/control processing "
+ "( 0 = off (default), 1 = module add/rm, 2 = >control summary, 3 = parsing, 4 = per-site changes)");
/* Return the path relative to source root */
static inline const char *trim_prefix(const char *path)
@@ -118,6 +120,8 @@ do { \
#define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__)
#define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__)
+#define v3pr_info(fmt, ...) vnpr_info(3, fmt, ##__VA_ARGS__)
+#define v4pr_info(fmt, ...) vnpr_info(4, fmt, ##__VA_ARGS__)
static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
{
@@ -130,7 +134,7 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
fmtlen--;
}
- vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
+ v3pr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
msg,
query->function ?: "",
query->filename ?: "",
@@ -213,7 +217,7 @@ static int ddebug_change(const struct ddebug_query *query,
static_branch_enable(&dp->key.dd_key_true);
#endif
dp->flags = newflags;
- v2pr_info("changed %s:%d [%s]%s =%s\n",
+ v4pr_info("changed %s:%d [%s]%s =%s\n",
trim_prefix(dp->filename), dp->lineno,
dt->mod_name, dp->function,
ddebug_describe_flags(dp->flags, &fbuf));
@@ -273,7 +277,7 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
buf = end;
}
- if (verbose) {
+ if (verbose >= 3) {
int i;
pr_info("split into words:");
for (i = 0; i < nwords; i++)
@@ -333,7 +337,7 @@ static int parse_linerange(struct ddebug_query *query, const char *first)
} else {
query->last_lineno = query->first_lineno;
}
- vpr_info("parsed line %d-%d\n", query->first_lineno,
+ v3pr_info("parsed line %d-%d\n", query->first_lineno,
query->last_lineno);
return 0;
}
@@ -447,7 +451,7 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
pr_err("bad flag-op %c, at start of %s\n", *str, str);
return -EINVAL;
}
- vpr_info("op='%c'\n", op);
+ v3pr_info("op='%c'\n", op);
for (; *str ; ++str) {
for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
@@ -461,7 +465,7 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
return -EINVAL;
}
}
- vpr_info("flags=0x%x\n", modifiers->flags);
+ v3pr_info("flags=0x%x\n", modifiers->flags);
/* calculate final flags, mask based upon op */
switch (op) {
@@ -477,7 +481,7 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
modifiers->flags = 0;
break;
}
- vpr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask);
+ v3pr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask);
return 0;
}
@@ -529,7 +533,7 @@ static int ddebug_exec_queries(char *query, const char *modname)
if (!query || !*query || *query == '#')
continue;
- vpr_info("query %d: \"%s\"\n", i, query);
+ vpr_info("query %d: \"%s\" mod:%s\n", i, query, modname ?: "*");
rc = ddebug_exec_query(query, modname);
if (rc < 0) {
@@ -540,8 +544,9 @@ static int ddebug_exec_queries(char *query, const char *modname)
}
i++;
}
- vpr_info("processed %d queries, with %d matches, %d errs\n",
- i, nfound, errs);
+ if (i)
+ v2pr_info("processed %d queries, with %d matches, %d errs\n",
+ i, nfound, errs);
if (exitcode)
return exitcode;
@@ -746,20 +751,17 @@ EXPORT_SYMBOL(__dynamic_ibdev_dbg);
#endif
-#define DDEBUG_STRING_SIZE 1024
-static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
-
-static __init int ddebug_setup_query(char *str)
+/*
+ * Install a noop handler to make dyndbg look like a normal kernel cli param.
+ * This avoids warnings about dyndbg being an unknown cli param when supplied
+ * by a user.
+ */
+static __init int dyndbg_setup(char *str)
{
- if (strlen(str) >= DDEBUG_STRING_SIZE) {
- pr_warn("ddebug boot param string too large\n");
- return 0;
- }
- strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
return 1;
}
-__setup("ddebug_query=", ddebug_setup_query);
+__setup("dyndbg=", dyndbg_setup);
/*
* File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
@@ -781,7 +783,7 @@ static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
tmpbuf = memdup_user_nul(ubuf, len);
if (IS_ERR(tmpbuf))
return PTR_ERR(tmpbuf);
- vpr_info("read %d bytes from userspace\n", (int)len);
+ v2pr_info("read %zu bytes from userspace\n", len);
ret = ddebug_exec_queries(tmpbuf, NULL);
kfree(tmpbuf);
@@ -969,7 +971,7 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
list_add(&dt->link, &ddebug_tables);
mutex_unlock(&ddebug_lock);
- v2pr_info("%3u debug prints in module %s\n", n, dt->mod_name);
+ vpr_info("%3u debug prints in module %s\n", n, dt->mod_name);
return 0;
}
@@ -1028,8 +1030,6 @@ int ddebug_remove_module(const char *mod_name)
struct ddebug_table *dt, *nextdt;
int ret = -ENOENT;
- v2pr_info("removing module \"%s\"\n", mod_name);
-
mutex_lock(&ddebug_lock);
list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
if (dt->mod_name == mod_name) {
@@ -1039,6 +1039,8 @@ int ddebug_remove_module(const char *mod_name)
}
}
mutex_unlock(&ddebug_lock);
+ if (!ret)
+ v2pr_info("removed module \"%s\"\n", mod_name);
return ret;
}
@@ -1121,16 +1123,6 @@ static int __init dynamic_debug_init(void)
entries, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10),
(int)((entries * sizeof(struct _ddebug)) >> 10));
- /* apply ddebug_query boot param, dont unload tables on err */
- if (ddebug_setup_string[0] != '\0') {
- pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
- ret = ddebug_exec_queries(ddebug_setup_string, NULL);
- if (ret < 0)
- pr_warn("Invalid ddebug boot param %s\n",
- ddebug_setup_string);
- else
- pr_info("%d changes by ddebug_query\n", ret);
- }
/* now that ddebug tables are loaded, process all boot args
* again to find and activate queries given in dyndbg params.
* While this has already been done for known boot params, it
generated by cgit (git 2.34.1) at 2024-05-15 18:57:42 +0000