[Intel-gfx] [PATCH v3 10/19] dyndbg-API: split DECLARE_(DYNDBG_CLASSMAP) to $1(_DEFINE|_USE)

Jim Cromie
2023-01-25T20:38:37Z

DECLARE_DYNDBG_CLASSMAP's job was to allow modules to declare the debug
classes/categories they want dyndbg to >control on their behalf. Its
args give the class-names, their mapping to class_ids, and the sysfs
interface style (usually a class-bitmap). Modules wanting a drm.debug
style knob need to create the kparam, and call module_param_cb() to
wire the sysfs node to the classmap. DRM does this is in drm_print.c

In DRM, multiple modules declare identical DRM_UT_* classmaps, so that
the class'd prdbgs are modified across those modules in a coordinated
way across the subsystem, by either explicit class DRM_UT_* queries to
>control, or by writes to /sys/module/drm/parameters/debug (drm.debug)

This coordination-by-identical-declarations is weird, so this patch
splits the macro into _DEFINE and _USE flavors. This distinction
follows the definition vs declaration that K&R gave us, improving the
api; _DEFINE is used once to specify the classmap, and multiple users
_USE the single definition explicitly.

Currently the latter just reuses the former, and still needs all the
same args, but that can be tuned later; the _DEFINE can initialize an
(extern/global) struct classmap, and _USE can, well use/reference
that struct.

Also wrap DYNDBG_CLASSMAP_USEs with ifdef DRM_USE_DYNAMIC_DEBUG to
balance with the one around drm_print's use of DYNDBG_CLASSMAP_DEFINE.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 +++-
drivers/gpu/drm/display/drm_dp_helper.c | 4 +++-
drivers/gpu/drm/drm_crtc_helper.c | 4 +++-
drivers/gpu/drm/drm_print.c | 2 +-
drivers/gpu/drm/i915/i915_params.c | 4 +++-
drivers/gpu/drm/nouveau/nouveau_drm.c | 4 +++-
include/linux/dynamic_debug.h | 20 ++++++++++++----
lib/test_dynamic_debug.c | 32 ++++++++++++-------------
8 files changed, 48 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index cd4caaa29528..a7a3a382c4a6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -189,7 +189,8 @@ int amdgpu_vcnfw_log;

static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work);

-DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+DYNDBG_CLASSMAP_USE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
@@ -200,6 +201,7 @@ DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
+#endif

struct amdgpu_mgpu_info mgpu_info = {
.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index 16565a0a5da6..8fa7a88299e7 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -41,7 +41,8 @@

#include "drm_dp_helper_internal.h"

-DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+DYNDBG_CLASSMAP_USE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
@@ -52,6 +53,7 @@ DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
+#endif

struct dp_aux_backlight {
struct backlight_device *base;
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index a209659a996c..7e6b25446303 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -50,7 +50,8 @@

#include "drm_crtc_helper_internal.h"

-DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+DYNDBG_CLASSMAP_USE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
@@ -61,6 +62,7 @@ DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
+#endif

/**
* DOC: overview
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 5b93c11895bb..4b697e18238d 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -56,7 +56,7 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat
module_param_named(debug, __drm_debug, ulong, 0600);
#else
/* classnames must match vals of enum drm_debug_category */
-DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+DYNDBG_CLASSMAP_DEFINE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index d1e4d528cb17..b5b2542ae364 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -29,7 +29,8 @@
#include "i915_params.h"
#include "i915_drv.h"

-DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+DYNDBG_CLASSMAP_USE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
@@ -40,6 +41,7 @@ DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
+#endif

#define i915_param_named(name, T, perm, desc) \
module_param_named(name, i915_modparams.name, T, perm); \
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 80f154b6adab..e4146b9af357 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -71,7 +71,8 @@
#include "nouveau_svm.h"
#include "nouveau_dmem.h"

-DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+#if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+DYNDBG_CLASSMAP_USE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
@@ -82,6 +83,7 @@ DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
+#endif

MODULE_PARM_DESC(config, "option string to pass to driver core");
static char *nouveau_config;
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 81b643ab7f6e..1cdfd62fd2e4 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -56,7 +56,7 @@ struct _ddebug {
#endif
} __attribute__((aligned(8)));

-enum class_map_type {
+enum ddebug_class_map_type {
DD_CLASS_TYPE_DISJOINT_BITS,
/**
* DD_CLASS_TYPE_DISJOINT_BITS: classes are independent, one per bit.
@@ -86,17 +86,19 @@ struct ddebug_class_map {
const char **class_names;
const int length;
const int base; /* index of 1st .class_id, allows split/shared space */
- enum class_map_type map_type;
+ enum ddebug_class_map_type map_type;
};

/**
- * DECLARE_DYNDBG_CLASSMAP - declare classnames known by a module
+ * DYNDBG_CLASSMAP_DEFINE - define the class_map that names the
+ * debug classes used in this module. This tells dyndbg the authorized
+ * classnames it should manipulate.
* @_var: a struct ddebug_class_map, passed to module_param_cb
* @_type: enum class_map_type, chooses bits/verbose, numeric/symbolic
* @_base: offset of 1st class-name. splits .class_id space
* @classes: class-names used to control class'd prdbgs
*/
-#define DECLARE_DYNDBG_CLASSMAP(_var, _maptype, _base, ...) \
+#define DYNDBG_CLASSMAP_DEFINE(_var, _maptype, _base, ...) \
static const char *_var##_classnames[] = { __VA_ARGS__ }; \
static struct ddebug_class_map __aligned(8) __used \
__section("__dyndbg_classes") _var = { \
@@ -108,6 +110,16 @@ struct ddebug_class_map {
.class_names = _var##_classnames, \
}

+/*
+ * refer to the classmap instantiated once, by the macro above. This
+ * distinguishes the multiple users of drm.debug from the single
+ * definition, allowing them to specialize. ATM its a pass-thru, but
+ * it should help regularize the admittedly wierd sharing by identical
+ * definitions.
+ */
+#define DYNDBG_CLASSMAP_USE(_var, _maptype, _base, ...) \
+ DYNDBG_CLASSMAP_DEFINE(_var, _maptype, _base, __VA_ARGS__)
+
/* encapsulate linker provided built-in (or module) dyndbg data */
struct _ddebug_info {
struct _ddebug *descs;
diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c
index 89dd7f285e31..8d384b979e74 100644
--- a/lib/test_dynamic_debug.c
+++ b/lib/test_dynamic_debug.c
@@ -62,38 +62,38 @@ enum cat_disjoint_bits {
D2_LEASE,
D2_DP,
D2_DRMRES };
-DECLARE_DYNDBG_CLASSMAP(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0,
- "D2_CORE",
- "D2_DRIVER",
- "D2_KMS",
- "D2_PRIME",
- "D2_ATOMIC",
- "D2_VBL",
- "D2_STATE",
- "D2_LEASE",
- "D2_DP",
- "D2_DRMRES");
+DYNDBG_CLASSMAP_DEFINE(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+ "D2_CORE",
+ "D2_DRIVER",
+ "D2_KMS",
+ "D2_PRIME",
+ "D2_ATOMIC",
+ "D2_VBL",
+ "D2_STATE",
+ "D2_LEASE",
+ "D2_DP",
+ "D2_DRMRES");
DD_SYS_WRAP(disjoint_bits, p);
DD_SYS_WRAP(disjoint_bits, T);

/* symbolic input, independent bits */
enum cat_disjoint_names { LOW = 10, MID, HI };
-DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,
- "LOW", "MID", "HI");
+DYNDBG_CLASSMAP_DEFINE(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,
+ "LOW", "MID", "HI");
DD_SYS_WRAP(disjoint_names, p);
DD_SYS_WRAP(disjoint_names, T);

/* numeric verbosity, V2 > V1 related */
enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };
-DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
+DYNDBG_CLASSMAP_DEFINE(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
"V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");
DD_SYS_WRAP(level_num, p);
DD_SYS_WRAP(level_num, T);

/* symbolic verbosity */
enum cat_level_names { L0 = 22, L1, L2, L3, L4, L5, L6, L7 };
-DECLARE_DYNDBG_CLASSMAP(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22,
- "L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7");
+DYNDBG_CLASSMAP_DEFINE(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22,
+ "L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7");
DD_SYS_WRAP(level_names, p);
DD_SYS_WRAP(level_names, T);

--
2.39.1