linux-kernel - [PATCH v7 4/8] amdgpu: use DEFINE_DYNAMIC_DEBUG

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Message-Id: <20210831202133.2165222-5-jim.cromie@gmail.com>
Date:   Tue, 31 Aug 2021 14:21:29 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org
Cc:     Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH v7 4/8] amdgpu: use DEFINE_DYNAMIC_DEBUG_CATEGORIES

logger_types.h defines many DC_LOG_*() categorized debug wrappers.
Most of these use DRM debug API, so are controllable using drm.debug,
but others use bare pr_debug("$prefix: .."), each with a different
class-prefix matching "^\[\w+\]:"

Use DEFINE_DYNAMIC_DEBUG_CATEGORIES to create a /sys debug_dc
parameter, modinfos, and to specify a map from bits -> categorized
pr_debugs to be controlled.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 .../gpu/drm/amd/display/dc/core/dc_debug.c    | 44 ++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_debug.c b/drivers/gpu/drm/amd/display/dc/core/dc_debug.c
index 21be2a684393..9fd43254db88 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_debug.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_debug.c
@@ -36,8 +36,50 @@
 
 #include "resource.h"
 
-#define DC_LOGGER_INIT(logger)
+#ifdef CONFIG_DRM_USE_DYNAMIC_DEBUG
+/* define a drm.debug style dyndbg pr-debug control point */
+#include <linux/dynamic_debug.h>
+
+unsigned long __debug_dc;
+EXPORT_SYMBOL(__debug_dc);
+
+#define _help_(key)	"\t   " key "\t- help for " key "\n"
+
+/* Id like to do these inside DEFINE_DYNAMIC_DEBUG_CATEGORIES, if possible */
+#define DC_DYNDBG_BITMAP_DESC(name)					\
+	"Control pr_debugs via /sys/module/amdgpu/parameters/" #name	\
+	", where each bit controls a debug category.\n"			\
+	_help_("[SURFACE]:")						\
+	_help_("[CURSOR]:")						\
+	_help_("[PFLIP]:")						\
+	_help_("[VBLANK]:")						\
+	_help_("[HW_LINK_TRAINING]:")					\
+	_help_("[HW_AUDIO]:")						\
+	_help_("[SCALER]:")						\
+	_help_("[BIOS]:")						\
+	_help_("[BANDWIDTH_CALCS]:")					\
+	_help_("[DML]:")						\
+	_help_("[IF_TRACE]:")						\
+	_help_("[GAMMA]:")						\
+	_help_("[SMU_MSG]:")
+
+DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug_dc, __debug_dc,
+	DC_DYNDBG_BITMAP_DESC(debug_dc),
+	_DD_cat_("[CURSOR]:"),
+	_DD_cat_("[PFLIP]:"),
+	_DD_cat_("[VBLANK]:"),
+	_DD_cat_("[HW_LINK_TRAINING]:"),
+	_DD_cat_("[HW_AUDIO]:"),
+	_DD_cat_("[SCALER]:"),
+	_DD_cat_("[BIOS]:"),
+	_DD_cat_("[BANDWIDTH_CALCS]:"),
+	_DD_cat_("[DML]:"),
+	_DD_cat_("[IF_TRACE]:"),
+	_DD_cat_("[GAMMA]:"),
+	_DD_cat_("[SMU_MSG]:"));
+#endif
 
+#define DC_LOGGER_INIT(logger)
 
 #define SURFACE_TRACE(...) do {\
 		if (dc->debug.surface_trace) \
-- 
2.31.1