[PATCH 19/63] dyndbg: make proper substructs in _ddebug_info
Jim Cromie
jim.cromie at gmail.com
Sat Nov 9 05:17:57 UTC 2024
struct _ddebug_info's jobs is to enapsulate the __sections of dyndbg
data from the linker. The data started as a single pair of fields:
descs - ref'g an array of descriptors & num_descs - counting the
"pertinent" descriptors. Then classes & num_classes were added, and
_ddebug_info was invented to contain the 4 fields.
When class_users & num_class_users were added (earlier in this
series), the easy path was to replicate functions and adapt them to
work on ddebug_class_users, instead of class_maps. This worked, but
made repetitive boilerplate code, leading to (other commits with)
macros walking num_##{classes,class_users} to capture the repetition.
To fix it better, create structs to contain start,len for vectors of
all 3 objects: classmaps, class_users, and pr_debug descriptors, and
adjust field-refs accordingly.
Also recompose struct ddebug_table to contain a _ddebug_info (rather
than repeat the contents, as before), and adjust all array-walks to
use the newly contained info.
This allows ridding the class* macros of the num##<T> paste-up, and
should enable further cleanups.
NB: The __packed attribute on _ddebug_info and the 3 contained structs
closes the holes otherwise created by the structification (which was
the excuse for not doing it originally).
TBD: see if this can precede other patches, to reduce churn
Signed-off-by: Jim Cromie <jim.cromie at gmail.com>
---
include/linux/dynamic_debug.h | 29 ++++++++---
kernel/module/main.c | 18 +++----
lib/dynamic_debug.c | 93 +++++++++++++++++------------------
3 files changed, 74 insertions(+), 66 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 2b0c943af330..48d76a273f68 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -173,15 +173,28 @@ struct ddebug_class_user {
.map = &(_var), \
}
-/* encapsulate linker provided built-in (or module) dyndbg data */
+/*
+ * @_ddebug_info: gathers module/builtin dyndbg_* __sections together.
+ * For builtins, it is used as a cursor, with the inner structs
+ * marking sub-vectors of the builtin __sections in DATA.
+ */
+struct _ddebug_descs {
+ struct _ddebug *start;
+ int len;
+} __packed;
+struct dd_class_maps {
+ struct ddebug_class_map *start;
+ int len;
+} __packed;
+struct dd_class_users {
+ struct ddebug_class_user *start;
+ int len;
+} __packed;
struct _ddebug_info {
- struct _ddebug *descs;
- struct ddebug_class_map *classes;
- struct ddebug_class_user *class_users;
- unsigned int num_descs;
- unsigned int num_classes;
- unsigned int num_class_users;
-};
+ struct _ddebug_descs descs;
+ struct dd_class_maps maps;
+ struct dd_class_users users;
+} __packed;
struct ddebug_class_param {
union {
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 3a4eeed2750c..be5c3f346a19 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -2231,15 +2231,15 @@ static int find_module_sections(struct module *mod, struct load_info *info)
pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
#ifdef CONFIG_DYNAMIC_DEBUG_CORE
- mod->dyndbg_info.descs = section_objs(info, "__dyndbg",
- sizeof(*mod->dyndbg_info.descs),
- &mod->dyndbg_info.num_descs);
- mod->dyndbg_info.classes = section_objs(info, "__dyndbg_classes",
- sizeof(*mod->dyndbg_info.classes),
- &mod->dyndbg_info.num_classes);
- mod->dyndbg_info.class_users = section_objs(info, "__dyndbg_class_users",
- sizeof(*mod->dyndbg_info.class_users),
- &mod->dyndbg_info.num_class_users);
+ mod->dyndbg_info.descs.start = section_objs(info, "__dyndbg",
+ sizeof(*mod->dyndbg_info.descs.start),
+ &mod->dyndbg_info.descs.len);
+ mod->dyndbg_info.maps.start = section_objs(info, "__dyndbg_classes",
+ sizeof(*mod->dyndbg_info.maps.start),
+ &mod->dyndbg_info.maps.len);
+ mod->dyndbg_info.users.start = section_objs(info, "__dyndbg_class_users",
+ sizeof(*mod->dyndbg_info.users.start),
+ &mod->dyndbg_info.users.len);
#endif
return 0;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 08b6e4e7489f..067db504dd1d 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -49,10 +49,7 @@ extern struct ddebug_class_user __stop___dyndbg_class_users[];
struct ddebug_table {
struct list_head link;
const char *mod_name;
- struct _ddebug *ddebugs;
- struct ddebug_class_map *classes;
- struct ddebug_class_user *class_users;
- unsigned int num_ddebugs, num_classes, num_class_users;
+ struct _ddebug_info info;
};
struct ddebug_query {
@@ -154,8 +151,8 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
#define vpr_dt_info(dt_p, msg_p, ...) ({ \
struct ddebug_table const *_dt = dt_p; \
v2pr_info(msg_p " module:%s nd:%d nc:%d nu:%d\n", ##__VA_ARGS__, \
- _dt->mod_name, _dt->num_ddebugs, _dt->num_classes, \
- _dt->num_class_users); \
+ _dt->mod_name, _dt->info.descs.len, _dt->info.maps.len, \
+ _dt->info.users.len); \
})
/*
@@ -168,8 +165,8 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
* @_vec: name of a sub-struct member in _box, with array-ref and length
*/
#define for_subvec(_i, _sp, _box, _vec) \
- for ((_i) = 0, (_sp) = (_box)->_vec; \
- (_i) < (_box)->num_##_vec; \
+ for ((_i) = 0, (_sp) = (_box)->_vec.start; \
+ (_i) < (_box)->_vec.len; \
(_i)++, (_sp)++)
static int ddebug_find_valid_class(struct ddebug_table const *dt, const char *class_string)
@@ -178,14 +175,14 @@ static int ddebug_find_valid_class(struct ddebug_table const *dt, const char *cl
struct ddebug_class_user *cli;
int i, idx;
- for_subvec(i, map, dt, classes) {
+ for_subvec(i, map, &dt->info, maps) {
idx = match_string(map->class_names, map->length, class_string);
if (idx >= 0) {
vpr_dt_info(dt, "good-class: %s.%s ", map->mod_name, class_string);
return idx + map->base;
}
}
- for_subvec(i, cli, dt, class_users) {
+ for_subvec(i, cli, &dt->info, users) {
idx = match_string(cli->map->class_names, cli->map->length, class_string);
if (idx >= 0) {
vpr_dt_info(dt, "class-ref: %s -> %s.%s ",
@@ -229,8 +226,8 @@ static int ddebug_change(const struct ddebug_query *query, struct flag_settings
valid_class = _DPRINTK_CLASS_DFLT;
}
- for (i = 0; i < dt->num_ddebugs; i++) {
- struct _ddebug *dp = &dt->ddebugs[i];
+ for (i = 0; i < dt->info.descs.len; i++) {
+ struct _ddebug *dp = &dt->info.descs.start[i];
/* match site against query-class */
if (dp->class_id != valid_class)
@@ -990,8 +987,8 @@ static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
}
iter->table = list_entry(ddebug_tables.next,
struct ddebug_table, link);
- iter->idx = iter->table->num_ddebugs;
- return &iter->table->ddebugs[--iter->idx];
+ iter->idx = iter->table->info.descs.len;
+ return &iter->table->info.descs.start[--iter->idx];
}
/*
@@ -1012,10 +1009,10 @@ static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
}
iter->table = list_entry(iter->table->link.next,
struct ddebug_table, link);
- iter->idx = iter->table->num_ddebugs;
+ iter->idx = iter->table->info.descs.len;
--iter->idx;
}
- return &iter->table->ddebugs[iter->idx];
+ return &iter->table->info.descs.start[iter->idx];
}
/*
@@ -1064,15 +1061,15 @@ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
static const char *ddebug_class_name(struct ddebug_table *dt, struct _ddebug *dp)
{
- struct ddebug_class_map *map = dt->classes;
- struct ddebug_class_user *cli = dt->class_users;
+ struct ddebug_class_map *map;
+ struct ddebug_class_user *cli;
int i;
- for (i = 0; i < dt->num_classes; i++, map++)
+ for_subvec(i, map, &dt->info, maps)
if (class_in_range(dp->class_id, map))
return map->class_names[dp->class_id - map->base];
- for (i = 0; i < dt->num_class_users; i++, cli++)
+ for_subvec(i, cli, &dt->info, users)
if (class_in_range(dp->class_id, cli->map))
return cli->map->class_names[dp->class_id - cli->map->base];
@@ -1203,8 +1200,7 @@ static void ddebug_apply_params(const struct ddebug_class_map *cm, const char *m
if (cm->mod) {
vpr_cm_info(cm, "loaded classmap: %s", modnm);
- /* ifdef protects the cm->mod->kp deref */
- for_subvec(i, kp, cm->mod, kp)
+ for (i = 0, kp = cm->mod->kp; i < cm->mod->num_kp; i++, kp++)
ddebug_match_apply_kparam(kp, cm, modnm);
}
#endif
@@ -1226,20 +1222,20 @@ static void ddebug_attach_module_classes(struct ddebug_table *dt,
struct ddebug_class_map *cm;
int i, nc = 0;
- for_subvec(i, cm, di, classes) {
+ for_subvec(i, cm, di, maps) {
if (!strcmp(cm->mod_name, dt->mod_name)) {
vpr_cm_info(cm, "classes[%d]:", i);
if (!nc++)
- dt->classes = cm;
+ dt->info.maps.start = cm;
}
}
if (!nc)
return;
vpr_info("module:%s attached %d classes\n", dt->mod_name, nc);
- dt->num_classes = nc;
+ dt->info.maps.len = nc;
- for_subvec(i, cm, dt, classes)
+ for_subvec(i, cm, &dt->info, maps)
ddebug_apply_params(cm, cm->mod_name);
}
@@ -1259,23 +1255,23 @@ static void ddebug_attach_user_module_classes(struct ddebug_table *dt,
* module's refs, save to dt. For loadables, this is the
* whole array.
*/
- for_subvec(i, cli, di, class_users) {
+ for_subvec(i, cli, di, users) {
if (WARN_ON_ONCE(!cli || !cli->map || !cli->mod_name))
continue;
if (!strcmp(cli->mod_name, dt->mod_name)) {
vpr_cm_info(cli->map, "class_ref[%d] %s -> %s", i,
cli->mod_name, cli->map->mod_name);
if (!nc++)
- dt->class_users = cli;
+ dt->info.users.start = cli;
}
}
if (!nc)
return;
- dt->num_class_users = nc;
+ dt->info.users.len = nc;
/* now iterate dt */
- for_subvec(i, cli, di, class_users)
+ for_subvec(i, cli, di, users)
ddebug_apply_params(cli->map, cli->mod_name);
vpr_dt_info(dt, "attach-client-module: ");
@@ -1291,10 +1287,10 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
struct _ddebug *iter;
int i, class_ct = 0;
- if (!di->num_descs)
+ if (!di->descs.len)
return 0;
- v3pr_info("add-module: %s %d sites\n", modname, di->num_descs);
+ v3pr_info("add-module: %s %d sites\n", modname, di->descs.len);
dt = kzalloc(sizeof(*dt), GFP_KERNEL);
if (dt == NULL) {
@@ -1308,8 +1304,7 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
* this struct ddebug_table.
*/
dt->mod_name = modname;
- dt->ddebugs = di->descs;
- dt->num_ddebugs = di->num_descs;
+ dt->info.descs = di->descs;
INIT_LIST_HEAD(&dt->link);
@@ -1317,17 +1312,17 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
if (iter->class_id != _DPRINTK_CLASS_DFLT)
class_ct++;
- if (class_ct && di->num_classes)
+ if (class_ct && di->maps.len)
ddebug_attach_module_classes(dt, di);
mutex_lock(&ddebug_lock);
list_add_tail(&dt->link, &ddebug_tables);
mutex_unlock(&ddebug_lock);
- if (class_ct && di->num_class_users)
+ if (class_ct && di->users.len)
ddebug_attach_user_module_classes(dt, di);
- vpr_info("%3u debug prints in module %s\n", di->num_descs, modname);
+ vpr_info("%3u debug prints in module %s\n", di->descs.len, modname);
return 0;
}
@@ -1474,12 +1469,12 @@ static int __init dynamic_debug_init(void)
char *cmdline;
struct _ddebug_info di = {
- .descs = __start___dyndbg,
- .classes = __start___dyndbg_classes,
- .class_users = __start___dyndbg_class_users,
- .num_descs = __stop___dyndbg - __start___dyndbg,
- .num_classes = __stop___dyndbg_classes - __start___dyndbg_classes,
- .num_class_users = __stop___dyndbg_class_users - __start___dyndbg_class_users,
+ .descs.start = __start___dyndbg,
+ .maps.start = __start___dyndbg_classes,
+ .users.start = __start___dyndbg_class_users,
+ .descs.len = __stop___dyndbg - __start___dyndbg,
+ .maps.len = __stop___dyndbg_classes - __start___dyndbg_classes,
+ .users.len = __stop___dyndbg_class_users - __start___dyndbg_class_users,
};
#ifdef CONFIG_MODULES
@@ -1508,8 +1503,8 @@ static int __init dynamic_debug_init(void)
if (strcmp(modname, iter->modname)) {
mod_ct++;
- di.num_descs = mod_sites;
- di.descs = iter_mod_start;
+ di.descs.len = mod_sites;
+ di.descs.start = iter_mod_start;
ret = ddebug_add_module(&di, modname);
if (ret)
goto out_err;
@@ -1519,8 +1514,8 @@ static int __init dynamic_debug_init(void)
iter_mod_start = iter;
}
}
- di.num_descs = mod_sites;
- di.descs = iter_mod_start;
+ di.descs.len = mod_sites;
+ di.descs.start = iter_mod_start;
ret = ddebug_add_module(&di, modname);
if (ret)
goto out_err;
@@ -1530,8 +1525,8 @@ static int __init dynamic_debug_init(void)
i, mod_ct, (int)((mod_ct * sizeof(struct ddebug_table)) >> 10),
(int)((i * sizeof(struct _ddebug)) >> 10));
- if (di.num_classes)
- v2pr_info(" %d builtin ddebug class-maps\n", di.num_classes);
+ if (di.maps.len)
+ v2pr_info(" %d builtin ddebug class-maps\n", di.maps.len);
/* now that ddebug tables are loaded, process all boot args
* again to find and activate queries given in dyndbg params.
--
2.47.0
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