linux-kernel - [PATCH v8 11/16] i915/gvt: use DEFINE_DYNAMIC_DEBUG

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Message-Id: <20210915163957.2949166-12-jim.cromie@gmail.com>
Date:   Wed, 15 Sep 2021 10:39:52 -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, daniel@...ll.ch
Cc:     Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH v8 11/16] i915/gvt: use DEFINE_DYNAMIC_DEBUG_CATEGORIES for existing prdbgs

The gvt component of this driver has ~120 pr_debugs, in 9 categories
quite similar to those in DRM.  Following the interface model of
drm.debug, add a parameter to map bits to these categorizations.

DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug_gvt, __gvt_debug,
	"dyndbg bitmap desc",
	_DD_cat_(0, "gvt:cmd:"),
	_DD_cat_(1, "gvt:core:"),
	_DD_cat_(2, "gvt:dpy:"),
	_DD_cat_(3, "gvt:el:"),
	_DD_cat_(4, "gvt:irq:"),
	_DD_cat_(5, "gvt:mm:"),
	_DD_cat_(6, "gvt:mmio:"),
	_DD_cat_(7, "gvt:render:"),
	_DD_cat_(8, "gvt:sched:"));

If CONFIG_DYNAMIC_DEBUG_CORE=y, then gvt/Makefile adds
-DDYNAMIC_DEBUG_MODULE to cflags, which CONFIG_DYNAMIC_DEBUG=n
(CORE-only) builds need.  This is redone more comprehensively soon.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
v5:
. static decl of vector of bit->class descriptors - Emil.V
. relocate gvt-makefile chunk from elsewhere

v7:
. move ccflags addition up to i915/Makefile from i915/gvt

v8:
. relocate DDD_CAT decl code into intel_gvt.c - Tvrtko
  cflags back to i915/Makefile
. add -DDYNAMIC_DEBUG_MODULE to support DYNAMIC_DEBUG_CORE-only builds

heres unchanged? footprint:

bash-5.1# for m in i915 amdgpu nouveau; do modprobe $m; done
dyndbg:   1 debug prints in module drm
dyndbg:   2 debug prints in module ttm
dyndbg:   8 debug prints in module video
dyndbg: 167 debug prints in module i915
dyndbg: 2339 debug prints in module amdgpu
[drm] amdgpu kernel modesetting enabled.
amdgpu: CRAT table disabled by module option
amdgpu: Virtual CRAT table created for CPU
amdgpu: Topology: Add CPU node
dyndbg:   3 debug prints in module wmi
dyndbg:   3 debug prints in module nouveau
---
 drivers/gpu/drm/i915/Makefile    |  2 ++
 drivers/gpu/drm/i915/intel_gvt.c | 34 ++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 4f22cac1c49b..038fd29c89d4 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -295,6 +295,8 @@ i915-y += intel_gvt.o
 include $(src)/gvt/Makefile
 endif
 
+ccflags-$(CONFIG_DYNAMIC_DEBUG_CORE) += -DDYNAMIC_DEBUG_MODULE
+
 obj-$(CONFIG_DRM_I915) += i915.o
 obj-$(CONFIG_DRM_I915_GVT_KVMGT) += gvt/kvmgt.o
 
diff --git a/drivers/gpu/drm/i915/intel_gvt.c b/drivers/gpu/drm/i915/intel_gvt.c
index 4e70c1a9ef2e..eb0da9173b23 100644
--- a/drivers/gpu/drm/i915/intel_gvt.c
+++ b/drivers/gpu/drm/i915/intel_gvt.c
@@ -162,3 +162,37 @@ void intel_gvt_resume(struct drm_i915_private *dev_priv)
 	if (intel_gvt_active(dev_priv))
 		intel_gvt_pm_resume(dev_priv->gvt);
 }
+
+#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+
+unsigned long __gvt_debug;
+EXPORT_SYMBOL(__gvt_debug);
+
+#define help_(_N, _cat)	"\t  Bit-" #_N ":\t" _cat "\n"
+
+#define I915_GVT_CATEGORIES(name) \
+	" Enable debug output via /sys/module/i915/parameters/" #name	\
+	", where each bit enables a debug category.\n"			\
+	help_(0, "gvt:cmd:")						\
+	help_(1, "gvt:core:")						\
+	help_(2, "gvt:dpy:")						\
+	help_(3, "gvt:el:")						\
+	help_(4, "gvt:irq:")						\
+	help_(5, "gvt:mm:")						\
+	help_(6, "gvt:mmio:")						\
+	help_(7, "gvt:render:")						\
+	help_(8, "gvt:sched:")
+
+DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug_gvt, __gvt_debug,
+				I915_GVT_CATEGORIES(debug_gvt),
+				_DD_cat_(0, "gvt:cmd:"),
+				_DD_cat_(1, "gvt:core:"),
+				_DD_cat_(2, "gvt:dpy:"),
+				_DD_cat_(3, "gvt:el:"),
+				_DD_cat_(4, "gvt:irq:"),
+				_DD_cat_(5, "gvt:mm:"),
+				_DD_cat_(6, "gvt:mmio:"),
+				_DD_cat_(7, "gvt:render:"),
+				_DD_cat_(8, "gvt:sched:"));
+
+#endif
-- 
2.31.1