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drm/print: describe 6th & 9th bit of drm.debug

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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 <michal.grzelak@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260522135520.1862848-2-michal.grzelak@intel.com
This commit is contained in:
Michał Grzelak
2026-06-03 11:24:52 +02:00
committed by Thomas Zimmermann
parent d59676b3eb
commit 96889ef7dc
2 changed files with 4 additions and 2 deletions
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drivers/gpu/drm/drm_print.c
+3 -1
View File
@@ -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);
include/drm/drm_print.h
+1 -1
View File
@@ -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::