linux-kernel - [PATCH v4 35/58] drm-dyndbg: adapt DRM to invoke DYNAMIC_DEBUG_CLASSMAP

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Message-ID: <20250803035816.603405-36-jim.cromie@gmail.com>
Date: Sat,  2 Aug 2025 21:57:53 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: linux-kernel@...r.kernel.org,
	jbaron@...mai.com,
	gregkh@...uxfoundation.org,
	ukaszb@...omium.org,
	louis.chauvet@...tlin.com
Cc: 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,
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	robdclark@...il.com,
	groeck@...gle.com,
	yanivt@...gle.com,
	bleung@...gle.com,
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	jim.cromie@...il.com
Subject: [PATCH v4 35/58] drm-dyndbg: adapt DRM to invoke DYNAMIC_DEBUG_CLASSMAP_PARAM

Invoke DYNAMIC_DEBUG_CLASSMAP_PARAM to hook drm.debug (__drm_debug) to the
DRM_UT_* classmap, replacing the ad-hoc wiring previously doing it.

Add DRM_CLASSMAP_* adapter macros to selectively use
DYNAMIC_DEBUG_CLASSMAP_* when DRM_USE_DYNAMIC_DEBUG=y is configured.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/drm_print.c | 8 ++------
 include/drm/drm_print.h     | 4 ++++
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index a3b70d104afaa..46d53fe302047 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -69,12 +69,8 @@ DRM_CLASSMAP_DEFINE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS,
 		    "DRM_UT_DP",
 		    "DRM_UT_DRMRES");
 
-static struct ddebug_class_param drm_debug_bitmap = {
-	.bits = &__drm_debug,
-	.flags = "p",
-	.map = &drm_debug_classes,
-};
-module_param_cb(debug, &param_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
+DRM_CLASSMAP_PARAM_REF(debug, __drm_debug, drm_debug_classes, p);
+
 #endif
 
 void __drm_puts_coredump(struct drm_printer *p, const char *str)
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 03b0a2bbf91b3..769036b2942b8 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -144,9 +144,13 @@ enum drm_debug_category {
 #ifdef CONFIG_DRM_USE_DYNAMIC_DEBUG
 #define DRM_CLASSMAP_DEFINE(...)    DYNAMIC_DEBUG_CLASSMAP_DEFINE(__VA_ARGS__)
 #define DRM_CLASSMAP_USE(name)      DYNAMIC_DEBUG_CLASSMAP_USE(name)
+#define DRM_CLASSMAP_PARAM_REF(...) DYNAMIC_DEBUG_CLASSMAP_PARAM_REF(__VA_ARGS__)
+#define DRM_CLASSMAP_PARAM(...)     DYNAMIC_DEBUG_CLASSMAP_PARAM(__VA_ARGS__)
 #else
 #define DRM_CLASSMAP_DEFINE(...)
 #define DRM_CLASSMAP_USE(name)
+#define DRM_CLASSMAP_PARAM_REF(...)
+#define DRM_CLASSMAP_PARAM(...)
 #endif
 
 static inline bool drm_debug_enabled_raw(enum drm_debug_category category)
-- 
2.50.1