On Fri, 22 May 2026, Michał Grzelak wrote:
Setting 6th or 9th bit of drm.debug change debug logging. Meanwhile
`modinfo drm` does not inform about it at all.
Add info to MODULE_PARAM_DESC(debug, ...) about setting 6th and 9th bit
basing on DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, ...). Match
description of corresponding bits with enum drm_debug_category. Include
9th bit in the example with enabling all possible logging provided at
comment at include/drm/drm_print.h.
Signed-off-by: Michał Grzelak <[email protected]>
What should have been added here is R-B: tag provided by Chaitanya,
which currently is very much absent. The omission was not intentional.
BR,
Michał
---
drivers/gpu/drm/drm_print.c | 4 +++-
include/drm/drm_print.h | 2 +-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index ded9461df5f2..86cef1a37678 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -50,8 +50,10 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit
enables a debug cat
"\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
"\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
"\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n"
+"\t\tBit 6 (0x40) will enable STATE messages (atomic state code)\n"
"\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n"
-"\t\tBit 8 (0x100) will enable DP messages (displayport code)");
+"\t\tBit 8 (0x100) will enable DP messages (displayport code)\n"
+"\t\tBit 9 (0x200) will enable DRMRES messages (managed resources code)");
#if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
module_param_named(debug, __drm_debug, ulong, 0600);
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index ab017b05e175..2adc5ac688e1 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -87,7 +87,7 @@ extern unsigned long __drm_debug;
* - drm.debug=0x2 will enable DRIVER messages
* - drm.debug=0x3 will enable CORE and DRIVER messages
* - ...
- * - drm.debug=0x1ff will enable all messages
+ * - drm.debug=0x3ff will enable all messages
*
* An interesting feature is that it's possible to enable verbose logging at
* run-time by echoing the debug value in its sysfs node::
--
2.45.2
