linux-kernel - [PATCH v9 10/10] drm: use DEFINE_DYNAMIC_DEBUG_TRACE

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Date:   Tue, 26 Oct 2021 22:36:45 -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 10/10] drm: use DEFINE_DYNAMIC_DEBUG_TRACE_CATEGORIES bitmap to tracefs

Use new macro to create a sysfs control bitmap knob to control
print-to-trace in: /sys/module/drm/parameters/trace

todo: reconsider this api, ie a single macro expecting both debug &
trace terms (2 each), followed by a single description and the
bitmap-spec::

Good: declares bitmap once for both interfaces

Bad: arg-type/count handling (expecting 4 args) is ugly,
     especially preceding the bitmap-init var-args.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 drivers/gpu/drm/drm_print.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index ce662d0f339b..7b49fbc5e21d 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -73,6 +73,25 @@ DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug, __drm_debug,
 				[7] = { DRM_DBG_CAT_LEASE },
 				[8] = { DRM_DBG_CAT_DP },
 				[9] = { DRM_DBG_CAT_DRMRES });
+
+#ifdef CONFIG_TRACING
+unsigned long __drm_trace;
+EXPORT_SYMBOL(__drm_trace);
+DEFINE_DYNAMIC_DEBUG_TRACE_CATEGORIES(trace, __drm_trace,
+				      DRM_DEBUG_DESC,
+				      [0] = { DRM_DBG_CAT_CORE },
+				      [1] = { DRM_DBG_CAT_DRIVER },
+				      [2] = { DRM_DBG_CAT_KMS },
+				      [3] = { DRM_DBG_CAT_PRIME },
+				      [4] = { DRM_DBG_CAT_ATOMIC },
+				      [5] = { DRM_DBG_CAT_VBL },
+				      [6] = { DRM_DBG_CAT_STATE },
+				      [7] = { DRM_DBG_CAT_LEASE },
+				      [8] = { DRM_DBG_CAT_DP },
+				      [9] = { DRM_DBG_CAT_DRMRES });
+
+struct trace_array *trace_arr;
+#endif
 #endif
 
 void __drm_puts_coredump(struct drm_printer *p, const char *str)
-- 
2.31.1