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Message-ID: <20250125064619.8305-23-jim.cromie@gmail.com>
Date: Fri, 24 Jan 2025 23:45:36 -0700
From: Jim Cromie <jim.cromie@...il.com>
To: linux-kernel@...r.kernel.org,
jbaron@...mai.com,
gregkh@...uxfoundation.org,
ukaszb@...omium.org
Cc: intel-gfx-trybot@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org,
amd-gfx@...ts.freedesktop.org,
intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org,
daniel.vetter@...ll.ch,
tvrtko.ursulin@...ux.intel.com,
jani.nikula@...el.com,
ville.syrjala@...ux.intel.com,
Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 22/63] dyndbg: rework ddebug_attach_*module_classes()
These 2 fns both start with a codeblock which cleans up the classmaps
arrays, finding the few that pertain to the module being added.
Reduce this repetition to a macro: dd_mark_vector_subrange() and call
it 2x. This macro finds the matching-on-modname subrange of a linker
ordered array of builtin classmaps/users, and saves the subrange into
the dt/debug-table's ddebug-info record.
Then hoist those calls from ddebug_attach*() up to ddebug_add_module().
This puts the "cleanup" of class* arrays into ddebug_add_module(), not
cluttering the original purpose of the 2 routines.
And with ddebug_add_module() now updating dt with the classmaps for
the module, the di arg to ddebug_attach_{,user}module_classes() is no
longer needed, so drop it.
Finally, rename the 2 functions, from *attach* (describing the dt
update in the macro) to module_apply_class_{maps,users} to reflect the
tighter focus.
NB: The macro's main purpose is to handle multiple builtin classmaps
or users, which is the only circumstance where less than the full
array of classmaps is pertinent.
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
---
lib/dynamic_debug.c | 104 ++++++++++++++++++++------------------------
1 file changed, 48 insertions(+), 56 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 0ef243e30663..8afcd4111531 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1212,72 +1212,54 @@ static void ddebug_apply_params(const struct ddebug_class_map *cm, const char *m
}
/*
- * Find this module's classmaps in a sub/whole-range of the builtin/
- * modular classmap vector/section. Save the start and length of the
- * subrange at its edges.
+ * scan the named array: @_vec, ref'd from inside @_box, for the
+ * start,len of the sub-array of elements matching on ->mod_name;
+ * remember them in _dst. Macro depends upon the fields being in both
+ * _box and _dst.
+ * @_i: caller provided counter var.
+ * @_sp: cursor into @_vec.
+ * @_box: ptr to a struct with @_vec, num__##@...c, mod_name fields.
+ * @_vec: name of ref into array[T] of builtin/modular __section data.
+ * @_dst: ptr to struct with @_vec and num__##@...c fields, both updated.
*/
-static int ddebug_attach_module_classes(struct ddebug_table *dt,
- const struct _ddebug_info *di,
- u64 *reserved_ids)
+#define dd_mark_vector_subrange(_i, _dst, _sp, _box, _vec) ({ \
+ int nc = 0; \
+ for_subvec(_i, _sp, _box, _vec) { \
+ if (!strcmp((_sp)->mod_name, (_dst)->mod_name)) { \
+ if (!nc++) \
+ (_dst)->info._vec.start = (_sp); \
+ } else { \
+ if (nc) \
+ break; /* end of consecutive matches */ \
+ } \
+ } \
+ (_dst)->info._vec.len = nc; \
+})
+
+static int ddebug_module_apply_class_maps(struct ddebug_table *dt,
+ u64 *reserved_ids)
{
struct ddebug_class_map *cm;
- int i, nc = 0;
-
- for_subvec(i, cm, di, maps) {
- if (!strcmp(cm->mod_name, dt->mod_name)) {
- vpr_cm_info(cm, "classes[%d]:", i);
- if (!nc++)
- dt->info.maps.start = cm;
- }
- }
- if (!nc)
- return 0;
-
- vpr_info("module:%s attached %d classes\n", dt->mod_name, nc);
- dt->info.maps.len = nc;
+ int i;
for_subvec(i, cm, &dt->info, maps)
ddebug_apply_params(cm, cm->mod_name);
+
+ vpr_info("module:%s attached %d classmaps\n", dt->mod_name, dt->info.maps.len);
return 0;
}
-/*
- * propagates class-params thru their classmaps to class-users. this
- * means a query against the dt/module, which means it must be on the
- * list to be seen by ddebug_change.
- */
-static int ddebug_attach_user_module_classes(struct ddebug_table *dt,
- const struct _ddebug_info *di,
- u64 *reserved_ids)
+static int ddebug_module_apply_class_users(struct ddebug_table *dt,
+ u64 *reserved_ids)
{
struct ddebug_class_user *cli;
- int i, nc = 0;
-
- /*
- * For builtins: scan the array, find start/length of this
- * module's refs, save to dt. For loadables, this is the
- * whole array.
- */
- 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->info.users.start = cli;
- }
- }
- if (!nc)
- return 0;
-
- dt->info.users.len = nc;
+ int i;
/* now iterate dt */
- for_subvec(i, cli, di, users)
+ for_subvec(i, cli, &dt->info, users)
ddebug_apply_params(cli->map, cli->mod_name);
- vpr_dt_info(dt, "attach-client-module: ");
+ vpr_info("module:%s attached %d classmap uses\n", dt->mod_name, dt->info.users.len);
return 0;
}
@@ -1288,8 +1270,10 @@ static int ddebug_attach_user_module_classes(struct ddebug_table *dt,
static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
{
struct ddebug_table *dt;
+ struct ddebug_class_map *cm;
+ struct ddebug_class_user *cli;
u64 reserved_ids = 0;
- int rc;
+ int rc, i;
if (!di->descs.len)
return 0;
@@ -1311,9 +1295,17 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
dt->info.descs = di->descs;
INIT_LIST_HEAD(&dt->link);
+ /*
+ * for builtin modules, ddebug_init() insures that the di
+ * cursor marks just the module's descriptors, but it doesn't
+ * do so for the builtin class _maps & _users. find the
+ * start,len of the vectors by mod_name, save to dt.
+ */
+ dd_mark_vector_subrange(i, dt, cm, di, maps);
+ dd_mark_vector_subrange(i, dt, cli, di, users);
- if (di->maps.len) {
- rc = ddebug_attach_module_classes(dt, di, &reserved_ids);
+ if (dt->info.maps.len) {
+ rc = ddebug_module_apply_class_maps(dt, &reserved_ids);
if (rc) {
kfree(dt);
return rc;
@@ -1324,8 +1316,8 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
mutex_unlock(&ddebug_lock);
- if (di->users.len) {
- rc = ddebug_attach_user_module_classes(dt, di, &reserved_ids);
+ if (dt->info.users.len) {
+ rc = ddebug_module_apply_class_users(dt, &reserved_ids);
if (rc)
return rc;
}
--
2.48.1
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