linux-kernel - [PATCH v9 03/10] amdgpu: use dyndbg.CATEGORIES to control existing pr

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Message-Id: <20211027043645.153133-4-jim.cromie@gmail.com>
Date:   Tue, 26 Oct 2021 22:36:38 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux@...musvillemoes.dk,
        daniel.vetter@...ll.ch, seanpaul@...omium.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 v9 03/10] amdgpu: use dyndbg.CATEGORIES to control existing pr_dbgs

logger_types.h defines many DC_LOG_*() categorized debug wrappers.
Most of these already use DRM debug API, so are controllable using
drm.debug, but others use a bare pr_debug("$prefix: .."), with 1 of 13
different class-prefixes matching [:uppercase:]

Use DEFINE_DYNAMIC_DEBUG_CATEGORIES to create a sysfs location which
maps from bits to these 13 sets of categorized pr_debugs to en/disable.

Makefile adds -DDYNAMIC_DEBUG_MODULE for CONFIG_DYNAMIC_DEBUG_CORE,
otherwise BUILD_BUG_ON triggers (obvious errors on subtle misuse is
better than mysterious ones).

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/Makefile           |  2 +
 .../gpu/drm/amd/display/dc/core/dc_debug.c    | 44 ++++++++++++++++++-
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 8d0748184a14..26d974edd5c1 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -38,6 +38,8 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \
 	-I$(FULL_AMD_DISPLAY_PATH)/amdgpu_dm \
 	-I$(FULL_AMD_PATH)/amdkfd
 
+ccflags-$(CONFIG_DYNAMIC_DEBUG_CORE) += -DYNAMIC_DEBUG_MODULE
+
 amdgpu-y := amdgpu_drv.o
 
 # add KMS driver
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..f08d9cf6c4b3 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_(_N, _cat)	"\t  Bit-" #_N "\t" _cat "\n"
+
+#define DC_DYNDBG_BITMAP_DESC(name)					\
+	"Control pr_debugs via /sys/module/amdgpu/parameters/" #name	\
+	", where each bit controls a debug category.\n"			\
+	help_(0, "[SURFACE]:")						\
+	help_(1, "[CURSOR]:")						\
+	help_(2, "[PFLIP]:")						\
+	help_(3, "[VBLANK]:")						\
+	help_(4, "[HW_LINK_TRAINING]:")				\
+	help_(5, "[HW_AUDIO]:")					\
+	help_(6, "[SCALER]:")						\
+	help_(7, "[BIOS]:")						\
+	help_(8, "[BANDWIDTH_CALCS]:")					\
+	help_(9, "[DML]:")						\
+	help_(10, "[IF_TRACE]:")					\
+	help_(11, "[GAMMA]:")						\
+	help_(12, "[SMU_MSG]:")
+
+DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug_dc, __debug_dc,
+				DC_DYNDBG_BITMAP_DESC(debug_dc),
+				[0] = { "[CURSOR]:" },
+				[1] = { "[PFLIP]:" },
+				[2] = { "[VBLANK]:" },
+				[3] = { "[HW_LINK_TRAINING]:" },
+				[4] = { "[HW_AUDIO]:" },
+				[5] = { "[SCALER]:" },
+				[6] = { "[BIOS]:" },
+				[7] = { "[BANDWIDTH_CALCS]:" },
+				[8] = { "[DML]:" },
+				[9] = { "[IF_TRACE]:" },
+				[10] = { "[GAMMA]:" },
+				[11] = { "[SMU_MSG]:" });
+
+#endif
 
+#define DC_LOGGER_INIT(logger)
 
 #define SURFACE_TRACE(...) do {\
 		if (dc->debug.surface_trace) \
-- 
2.31.1