recompose struct _ddebug_info, inserting proper sub-structs. The struct _ddebug_info has 2 pairs of _vec, num_##_vec fields, for descs and classes respectively. for_subvec() makes walking these vectors less cumbersome, now lets move those field pairs into their own "vec" structs: _ddebug_descs & _ddebug_class_maps, and re-compose struct _ddebug_info to contain them cleanly. This also lets us get rid of for_subvec()'s num_##_vec paste-up.
Also recompose struct ddebug_table to contain a _ddebug_info. This reinforces _ddebug_info's use as a cursor into relevant data for a builtin module, and access to the full _ddebug state for modules. NOTES: Change section names together, for more obvious name pairing. Invariant: These vectors ref a contiguous subrange of __section memory in builtin/DATA or in loadable modules via mod->dyndbg_info; with guaranteed life-time for us. struct module contains a _ddebug_info field and module/main.c sets it up, so that gets adjusted rather obviously. Signed-off-by: Jim Cromie <[email protected]> Reviewed-by: Louis Chauvet <[email protected]> --- v3: squash in section name changes. v2: Move RvB after SoB In structs _ddebug_descs & _ddebug_class_maps, change int length to unsigned int No use of <0 vals is contemplated. dyndbg: improve section names change __dyndbg to __dyndbg_descs change __dyndbg_classes to __dyndbg_class_maps this sets up for adding __dyndbg_class_users --- drivers/gpu/drm/drm_print.c | 2 +- include/asm-generic/dyndbg.lds.h | 14 +++--- include/linux/dynamic_debug.h | 34 +++++++++----- kernel/module/main.c | 12 ++--- lib/dynamic_debug.c | 98 ++++++++++++++++++++-------------------- 5 files changed, 86 insertions(+), 74 deletions(-) diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c index 711ae6606c6e..da2171186c6b 100644 --- a/drivers/gpu/drm/drm_print.c +++ b/drivers/gpu/drm/drm_print.c @@ -69,7 +69,7 @@ DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, "DRM_UT_DP", "DRM_UT_DRMRES"); -static struct ddebug_class_param drm_debug_bitmap = { +static struct _ddebug_class_param drm_debug_bitmap = { .bits = &__drm_debug, .flags = "p", .map = &drm_debug_classes, diff --git a/include/asm-generic/dyndbg.lds.h b/include/asm-generic/dyndbg.lds.h index 9d8951bef688..ec661f9f3793 100644 --- a/include/asm-generic/dyndbg.lds.h +++ b/include/asm-generic/dyndbg.lds.h @@ -3,16 +3,16 @@ #define __ASM_GENERIC_DYNDBG_LDS_H #include <asm-generic/bounded_sections.lds.h> -#define DYNDBG_SECTIONS() \ - BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ - BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) +#define DYNDBG_SECTIONS() \ + BOUNDED_SECTION_BY(__dyndbg_descs, ___dyndbg_descs) \ + BOUNDED_SECTION_BY(__dyndbg_class_maps, ___dyndbg_class_maps) #define MOD_DYNDBG_SECTIONS() \ - __dyndbg 0 : ALIGN(8) { \ - KEEP(*(__dyndbg)) \ + __dyndbg_descs 0 : ALIGN(8) { \ + KEEP(*(__dyndbg_descs)) \ } \ - __dyndbg_classes 0 : ALIGN(8) { \ - KEEP(*(__dyndbg_classes)) \ + __dyndbg_class_maps 0 : ALIGN(8) { \ + KEEP(*(__dyndbg_class_maps)) \ } #endif /* __ASM_GENERIC_DYNDBG_LDS_H */ diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index 250b8391cb14..ca27bdd92693 100644 --- a/include/linux/dynamic_debug.h +++ b/include/linux/dynamic_debug.h @@ -87,7 +87,7 @@ enum ddebug_class_map_type { }; struct ddebug_class_map { - struct module *mod; + struct module *mod; /* NULL for builtins */ const char *mod_name; /* needed for builtins */ const char **class_names; const int length; @@ -95,12 +95,24 @@ struct ddebug_class_map { enum ddebug_class_map_type map_type; }; -/* 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; + unsigned int len; +}; + +struct _ddebug_class_maps { + struct ddebug_class_map *start; + unsigned int len; +}; + struct _ddebug_info { - struct _ddebug *descs; - struct ddebug_class_map *classes; - unsigned int num_descs; - unsigned int num_classes; + struct _ddebug_descs descs; + struct _ddebug_class_maps maps; }; struct ddebug_class_param { @@ -121,7 +133,7 @@ struct ddebug_class_param { /** * DECLARE_DYNDBG_CLASSMAP - declare classnames known by a module - * @_var: a struct _ddebug_class_map, passed to module_param_cb + * @_var: a struct ddebug_class_map, passed to module_param_cb * @_maptype: enum ddebug_class_map_type, chooses bits/verbose * @_base: offset of 1st class-name. splits .class_id space * @classes: class-names used to control class'd prdbgs @@ -129,7 +141,7 @@ struct ddebug_class_param { #define DECLARE_DYNDBG_CLASSMAP(_var, _maptype, _base, ...) \ static const char *_var##_classnames[] = { __VA_ARGS__ }; \ static struct ddebug_class_map __aligned(8) __used \ - __section("__dyndbg_classes") _var = { \ + __section("__dyndbg_class_maps") _var = { \ .mod = THIS_MODULE, \ .mod_name = DDEBUG_MODNAME, \ .base = _base, \ @@ -169,7 +181,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor, #define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \ static struct _ddebug __aligned(8) \ - __section("__dyndbg") name = { \ + __section("__dyndbg_descs") name = { \ .modname = DDEBUG_MODNAME, \ .function = __func__, \ .filename = __FILE__, \ @@ -256,7 +268,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor, * macro. */ #define _dynamic_func_call_cls(cls, fmt, func, ...) \ - __dynamic_func_call_cls(__UNIQUE_ID(ddebug), cls, fmt, func, ##__VA_ARGS__) + __dynamic_func_call_cls(__UNIQUE_ID(_ddebug), cls, fmt, func, ##__VA_ARGS__) #define _dynamic_func_call(fmt, func, ...) \ _dynamic_func_call_cls(_DPRINTK_CLASS_DFLT, fmt, func, ##__VA_ARGS__) @@ -266,7 +278,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor, * with precisely the macro's varargs. */ #define _dynamic_func_call_cls_no_desc(cls, fmt, func, ...) \ - __dynamic_func_call_cls_no_desc(__UNIQUE_ID(ddebug), cls, fmt, \ + __dynamic_func_call_cls_no_desc(__UNIQUE_ID(_ddebug), cls, fmt, \ func, ##__VA_ARGS__) #define _dynamic_func_call_no_desc(fmt, func, ...) \ _dynamic_func_call_cls_no_desc(_DPRINTK_CLASS_DFLT, fmt, \ diff --git a/kernel/module/main.c b/kernel/module/main.c index 46dd8d25a605..bd7899a91755 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -2774,12 +2774,12 @@ 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.descs.start = section_objs(info, "__dyndbg_descs", + sizeof(*mod->dyndbg_info.descs.start), + &mod->dyndbg_info.descs.len); + mod->dyndbg_info.maps.start = section_objs(info, "__dyndbg_class_maps", + sizeof(*mod->dyndbg_info.maps.start), + &mod->dyndbg_info.maps.len); #endif return 0; diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index af05f4ae3b55..5a884cbd6294 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -39,17 +39,15 @@ #include <rdma/ib_verbs.h> -extern struct _ddebug __start___dyndbg[]; -extern struct _ddebug __stop___dyndbg[]; -extern struct ddebug_class_map __start___dyndbg_classes[]; -extern struct ddebug_class_map __stop___dyndbg_classes[]; +extern struct _ddebug __start___dyndbg_descs[]; +extern struct _ddebug __stop___dyndbg_descs[]; +extern struct ddebug_class_map __start___dyndbg_class_maps[]; +extern struct ddebug_class_map __stop___dyndbg_class_maps[]; struct ddebug_table { struct list_head link; const char *mod_name; - struct _ddebug *ddebugs; - struct ddebug_class_map *classes; - unsigned int num_ddebugs, num_classes; + struct _ddebug_info info; }; struct ddebug_query { @@ -159,18 +157,18 @@ static void v3pr_info_dq(const struct ddebug_query *query, const char *msg) * @_vec: name of a member in @_box */ #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)++) /* { block } */ static struct ddebug_class_map *ddebug_find_valid_class(struct ddebug_table const *dt, - const char *class_string, - int *class_id) + const char *class_string, + int *class_id) { struct ddebug_class_map *map; 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) { *class_id = idx + map->base; @@ -267,8 +265,8 @@ static int ddebug_change(const struct ddebug_query *query, 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]; if (!ddebug_match_desc(query, dp, valid_class)) continue; @@ -1013,8 +1011,8 @@ 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]; } /* @@ -1035,10 +1033,10 @@ 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]; } /* @@ -1082,16 +1080,19 @@ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) return dp; } -#define class_in_range(class_id, map) \ - (class_id >= map->base && class_id < map->base + map->length) +static bool ddebug_class_in_range(const int class_id, const struct ddebug_class_map *map) +{ + return (class_id >= map->base && + class_id < map->base + map->length); +} -static const char *ddebug_class_name(struct ddebug_iter *iter, struct _ddebug *dp) +static const char *ddebug_class_name(struct ddebug_table *dt, struct _ddebug *dp) { - struct ddebug_class_map *map = iter->table->classes; - int i, nc = iter->table->num_classes; + struct ddebug_class_map *map; + int i; - for (i = 0; i < nc; i++, map++) - if (class_in_range(dp->class_id, map)) + for_subvec(i, map, &dt->info, maps) + if (ddebug_class_in_range(dp->class_id, map)) return map->class_names[dp->class_id - map->base]; return NULL; @@ -1124,7 +1125,7 @@ static int ddebug_proc_show(struct seq_file *m, void *p) seq_putc(m, '"'); if (dp->class_id != _DPRINTK_CLASS_DFLT) { - class = ddebug_class_name(iter, dp); + class = ddebug_class_name(iter->table, dp); if (class) seq_printf(m, " class:%s", class); else @@ -1184,12 +1185,12 @@ static void ddebug_attach_module_classes(struct ddebug_table *dt, struct _ddebug * the builtin/modular classmap vector/section. Save the start * and length of the subrange at its edges. */ - for_subvec(i, cm, di, classes) { + for_subvec(i, cm, di, maps) { if (!strcmp(cm->mod_name, dt->mod_name)) { if (!nc) { v2pr_info("start subrange, class[%d]: module:%s base:%d len:%d ty:%d\n", i, cm->mod_name, cm->base, cm->length, cm->map_type); - dt->classes = cm; + dt->info.maps.start = cm; } nc++; } else if (nc) { @@ -1198,7 +1199,7 @@ static void ddebug_attach_module_classes(struct ddebug_table *dt, struct _ddebug } } if (nc) { - dt->num_classes = nc; + dt->info.maps.len = nc; vpr_info("module:%s attached %d classes\n", dt->mod_name, nc); } } @@ -1211,10 +1212,10 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname) { struct ddebug_table *dt; - 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_obj(*dt); if (dt == NULL) { @@ -1228,19 +1229,18 @@ 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 = *di; INIT_LIST_HEAD(&dt->link); - if (di->classes && di->num_classes) + if (di->maps.len) ddebug_attach_module_classes(dt, di); mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); - 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; } @@ -1387,10 +1387,10 @@ static int __init dynamic_debug_init(void) char *cmdline; struct _ddebug_info di = { - .descs = __start___dyndbg, - .classes = __start___dyndbg_classes, - .num_descs = __stop___dyndbg - __start___dyndbg, - .num_classes = __stop___dyndbg_classes - __start___dyndbg_classes, + .descs.start = __start___dyndbg_descs, + .maps.start = __start___dyndbg_class_maps, + .descs.len = __stop___dyndbg_descs - __start___dyndbg_descs, + .maps.len = __stop___dyndbg_class_maps - __start___dyndbg_class_maps, }; #ifdef CONFIG_MODULES @@ -1401,7 +1401,7 @@ static int __init dynamic_debug_init(void) } #endif /* CONFIG_MODULES */ - if (&__start___dyndbg == &__stop___dyndbg) { + if (&__start___dyndbg_descs == &__stop___dyndbg_descs) { if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); return 1; @@ -1411,16 +1411,16 @@ static int __init dynamic_debug_init(void) return 0; } - iter = iter_mod_start = __start___dyndbg; + iter = iter_mod_start = __start___dyndbg_descs; modname = iter->modname; i = mod_sites = mod_ct = 0; - for (; iter < __stop___dyndbg; iter++, i++, mod_sites++) { + for (; iter < __stop___dyndbg_descs; iter++, i++, mod_sites++) { 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; @@ -1430,19 +1430,19 @@ 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; ddebug_init_success = 1; - vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg section\n", + vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg_descs section\n", 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. -- 2.54.0
