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[67.165.245.5]) by smtp.googlemail.com with ESMTPSA id 8926c6da1cb9f-4ec1da476fesm1174144173.58.2025.01.24.22.46.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jan 2025 22:46:57 -0800 (PST) From: Jim Cromie To: linux-kernel@vger.kernel.org, jbaron@akamai.com, gregkh@linuxfoundation.org, ukaszb@chromium.org Cc: intel-gfx-trybot@lists.freedesktop.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com, jani.nikula@intel.com, ville.syrjala@linux.intel.com, Jim Cromie Subject: [PATCH 19/63] dyndbg: make proper substructs in _ddebug_info Date: Fri, 24 Jan 2025 23:45:33 -0700 Message-ID: <20250125064619.8305-20-jim.cromie@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250125064619.8305-1-jim.cromie@gmail.com> References: <20250125064619.8305-1-jim.cromie@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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## 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 Reviewed-by: Louis Chauvet --- 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 =3D &(_var), \ } =20 -/* 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; =20 struct ddebug_class_param { union { diff --git a/kernel/module/main.c b/kernel/module/main.c index c394a0c6e8c6..858882a1eacd 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -2540,15 +2540,15 @@ static int find_module_sections(struct module *mod,= struct load_info *info) pr_warn("%s: Ignoring obsolete parameters\n", mod->name); =20 #ifdef CONFIG_DYNAMIC_DEBUG_CORE - mod->dyndbg_info.descs =3D section_objs(info, "__dyndbg", - sizeof(*mod->dyndbg_info.descs), - &mod->dyndbg_info.num_descs); - mod->dyndbg_info.classes =3D section_objs(info, "__dyndbg_classes", - sizeof(*mod->dyndbg_info.classes), - &mod->dyndbg_info.num_classes); - mod->dyndbg_info.class_users =3D section_objs(info, "__dyndbg_class_users= ", - sizeof(*mod->dyndbg_info.class_users), - &mod->dyndbg_info.num_class_users); + mod->dyndbg_info.descs.start =3D section_objs(info, "__dyndbg", + sizeof(*mod->dyndbg_info.descs.start), + &mod->dyndbg_info.descs.len); + mod->dyndbg_info.maps.start =3D section_objs(info, "__dyndbg_classes", + sizeof(*mod->dyndbg_info.maps.start), + &mod->dyndbg_info.maps.len); + mod->dyndbg_info.users.start =3D section_objs(info, "__dyndbg_class_users= ", + sizeof(*mod->dyndbg_info.users.start), + &mod->dyndbg_info.users.len); #endif =20 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_us= ers[]; 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; }; =20 struct ddebug_query { @@ -154,8 +151,8 @@ static void vpr_info_dq(const struct ddebug_query *quer= y, const char *msg) #define vpr_dt_info(dt_p, msg_p, ...) ({ \ struct ddebug_table const *_dt =3D 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); \ }) =20 /* @@ -168,8 +165,8 @@ static void vpr_info_dq(const struct ddebug_query *quer= y, 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) =3D 0, (_sp) =3D (_box)->_vec; \ - (_i) < (_box)->num_##_vec; \ + for ((_i) =3D 0, (_sp) =3D (_box)->_vec.start; \ + (_i) < (_box)->_vec.len; \ (_i)++, (_sp)++) =20 static int ddebug_find_valid_class(struct ddebug_table const *dt, const ch= ar *class_string) @@ -178,14 +175,14 @@ static int ddebug_find_valid_class(struct ddebug_tabl= e const *dt, const char *cl struct ddebug_class_user *cli; int i, idx; =20 - for_subvec(i, map, dt, classes) { + for_subvec(i, map, &dt->info, maps) { idx =3D match_string(map->class_names, map->length, class_string); if (idx >=3D 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 =3D match_string(cli->map->class_names, cli->map->length, class_stri= ng); if (idx >=3D 0) { vpr_dt_info(dt, "class-ref: %s -> %s.%s ", @@ -229,8 +226,8 @@ static int ddebug_change(const struct ddebug_query *que= ry, struct flag_settings valid_class =3D _DPRINTK_CLASS_DFLT; } =20 - for (i =3D 0; i < dt->num_ddebugs; i++) { - struct _ddebug *dp =3D &dt->ddebugs[i]; + for (i =3D 0; i < dt->info.descs.len; i++) { + struct _ddebug *dp =3D &dt->info.descs.start[i]; =20 /* match site against query-class */ if (dp->class_id !=3D valid_class) @@ -990,8 +987,8 @@ static struct _ddebug *ddebug_iter_first(struct ddebug_= iter *iter) } iter->table =3D list_entry(ddebug_tables.next, struct ddebug_table, link); - iter->idx =3D iter->table->num_ddebugs; - return &iter->table->ddebugs[--iter->idx]; + iter->idx =3D iter->table->info.descs.len; + return &iter->table->info.descs.start[--iter->idx]; } =20 /* @@ -1012,10 +1009,10 @@ static struct _ddebug *ddebug_iter_next(struct ddeb= ug_iter *iter) } iter->table =3D list_entry(iter->table->link.next, struct ddebug_table, link); - iter->idx =3D iter->table->num_ddebugs; + iter->idx =3D iter->table->info.descs.len; --iter->idx; } - return &iter->table->ddebugs[iter->idx]; + return &iter->table->info.descs.start[iter->idx]; } =20 /* @@ -1064,15 +1061,15 @@ static void *ddebug_proc_next(struct seq_file *m, v= oid *p, loff_t *pos) =20 static const char *ddebug_class_name(struct ddebug_table *dt, struct _ddeb= ug *dp) { - struct ddebug_class_map *map =3D dt->classes; - struct ddebug_class_user *cli =3D dt->class_users; + struct ddebug_class_map *map; + struct ddebug_class_user *cli; int i; =20 - for (i =3D 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]; =20 - for (i =3D 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]; =20 @@ -1203,8 +1200,7 @@ static void ddebug_apply_params(const struct ddebug_c= lass_map *cm, const char *m =20 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 =3D 0, kp =3D 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 dde= bug_table *dt, struct ddebug_class_map *cm; int i, nc =3D 0; =20 - 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 =3D cm; + dt->info.maps.start =3D cm; } } if (!nc) return; =20 vpr_info("module:%s attached %d classes\n", dt->mod_name, nc); - dt->num_classes =3D nc; + dt->info.maps.len =3D nc; =20 - for_subvec(i, cm, dt, classes) + for_subvec(i, cm, &dt->info, maps) ddebug_apply_params(cm, cm->mod_name); } =20 @@ -1259,23 +1255,23 @@ static void ddebug_attach_user_module_classes(struc= t 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 =3D cli; + dt->info.users.start =3D cli; } } if (!nc) return; =20 - dt->num_class_users =3D nc; + dt->info.users.len =3D nc; =20 /* now iterate dt */ - for_subvec(i, cli, di, class_users) + for_subvec(i, cli, di, users) ddebug_apply_params(cli->map, cli->mod_name); =20 vpr_dt_info(dt, "attach-client-module: "); @@ -1291,10 +1287,10 @@ static int ddebug_add_module(struct _ddebug_info *d= i, const char *modname) struct _ddebug *iter; int i, class_ct =3D 0; =20 - if (!di->num_descs) + if (!di->descs.len) return 0; =20 - v3pr_info("add-module: %s %d sites\n", modname, di->num_descs); + v3pr_info("add-module: %s %d sites\n", modname, di->descs.len); =20 dt =3D kzalloc(sizeof(*dt), GFP_KERNEL); if (dt =3D=3D NULL) { @@ -1308,8 +1304,7 @@ static int ddebug_add_module(struct _ddebug_info *di,= const char *modname) * this struct ddebug_table. */ dt->mod_name =3D modname; - dt->ddebugs =3D di->descs; - dt->num_ddebugs =3D di->num_descs; + dt->info.descs =3D di->descs; =20 INIT_LIST_HEAD(&dt->link); =20 @@ -1317,17 +1312,17 @@ static int ddebug_add_module(struct _ddebug_info *d= i, const char *modname) if (iter->class_id !=3D _DPRINTK_CLASS_DFLT) class_ct++; =20 - if (class_ct && di->num_classes) + if (class_ct && di->maps.len) ddebug_attach_module_classes(dt, di); =20 mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); =20 - if (class_ct && di->num_class_users) + if (class_ct && di->users.len) ddebug_attach_user_module_classes(dt, di); =20 - 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; } =20 @@ -1474,12 +1469,12 @@ static int __init dynamic_debug_init(void) char *cmdline; =20 struct _ddebug_info di =3D { - .descs =3D __start___dyndbg, - .classes =3D __start___dyndbg_classes, - .class_users =3D __start___dyndbg_class_users, - .num_descs =3D __stop___dyndbg - __start___dyndbg, - .num_classes =3D __stop___dyndbg_classes - __start___dyndbg_classes, - .num_class_users =3D __stop___dyndbg_class_users - __start___dyndbg_clas= s_users, + .descs.start =3D __start___dyndbg, + .maps.start =3D __start___dyndbg_classes, + .users.start =3D __start___dyndbg_class_users, + .descs.len =3D __stop___dyndbg - __start___dyndbg, + .maps.len =3D __stop___dyndbg_classes - __start___dyndbg_classes, + .users.len =3D __stop___dyndbg_class_users - __start___dyndbg_class_user= s, }; =20 #ifdef CONFIG_MODULES @@ -1508,8 +1503,8 @@ static int __init dynamic_debug_init(void) =20 if (strcmp(modname, iter->modname)) { mod_ct++; - di.num_descs =3D mod_sites; - di.descs =3D iter_mod_start; + di.descs.len =3D mod_sites; + di.descs.start =3D iter_mod_start; ret =3D ddebug_add_module(&di, modname); if (ret) goto out_err; @@ -1519,8 +1514,8 @@ static int __init dynamic_debug_init(void) iter_mod_start =3D iter; } } - di.num_descs =3D mod_sites; - di.descs =3D iter_mod_start; + di.descs.len =3D mod_sites; + di.descs.start =3D iter_mod_start; ret =3D 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)); =20 - 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); =20 /* now that ddebug tables are loaded, process all boot args * again to find and activate queries given in dyndbg params. --=20 2.48.1