[PATCH v3 33/39] dyndbg/drm: POC add tracebits sysfs-knob
Jim Cromie
jim.cromie at gmail.com
Mon Jul 18 06:36:27 UTC 2022
clone DRM.debug interface to DRM.tracebits: ie map bits to
drm-debug-categories, except this interface enables messages to
tracefs, not to syslog.
1- we reuse the class-map added previously.
this reflects the single source of both syslog/trace events
2- add a 2nd struct ddebug_classes_bitmap_param
refs 1, reusing it.
flags = "T", to enable trace-events on this callsite.
3- module_param_cb([2]) - does the sysfs part
Signed-off-by: Jim Cromie <jim.cromie at gmail.com>
---
drivers/gpu/drm/drm_print.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 9fb0b8e40dca..47a41d96beea 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -45,6 +45,9 @@
unsigned long __drm_debug;
EXPORT_SYMBOL(__drm_debug);
+unsigned long __drm_trace;
+EXPORT_SYMBOL(__drm_trace);
+
MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
"\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
"\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
@@ -77,6 +80,13 @@ static struct ddebug_classes_bitmap_param drm_debug_bitmap = {
.map = &drm_debug_classes,
};
module_param_cb(debug, ¶m_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
+
+static struct ddebug_classes_bitmap_param drm_trace_bitmap = {
+ .bits = &__drm_trace,
+ .flags = "T",
+ .map = &drm_debug_classes,
+};
+module_param_cb(tracecats, ¶m_ops_dyndbg_classes, &drm_trace_bitmap, 0600);
#endif
void __drm_puts_coredump(struct drm_printer *p, const char *str)
--
2.36.1
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