[PATCH v7 2/9] drm: POC drm on dyndbg - use in core, 2 helpers, 3 drivers.

From: Jim Cromie
Date: Mon Sep 12 2022 - 01:29:33 EST

Use DECLARE_DYNDBG_CLASSMAP across DRM:

- in .c files, since macro defines/initializes a record

- in drivers, $mod_{drv,drm,param}.c
ie where param setup is done, since a classmap is param related

- in drm/drm_print.c
since existing __drm_debug param is defined there,
and we ifdef it, and provide an elaborated alternative.

- in drm_*_helper modules:
dp/drm_dp - 1st item in makefile target
drivers/gpu/drm/drm_crtc_helper.c - random pick iirc.

Since these modules all use identical CLASSMAP declarations (ie: names
and .class_id's) they will all respond together to "class DRM_UT_*"
query-commands:

:#> echo class DRM_UT_KMS +p > /proc/dynamic_debug/control

NOTES:

This changes __drm_debug from int to ulong, so BIT() is usable on it.

DRM's enum drm_debug_category values need to sync with the index of
their respective class-names here. Then .class_id == category, and
dyndbg's class FOO mechanisms will enable drm_dbg(DRM_UT_KMS, ...).

Though DRM needs consistent categories across all modules, thats not
generally needed; modules X and Y could define FOO differently (ie a
different NAME => class_id mapping), changes are made according to
each module's private class-map.

No callsites are actually selected by this patch, since none are
class'd yet.

Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 14 +++++++++++++
drivers/gpu/drm/display/drm_dp_helper.c | 13 ++++++++++++
drivers/gpu/drm/drm_crtc_helper.c | 13 ++++++++++++
drivers/gpu/drm/drm_print.c | 27 +++++++++++++++++++++++--
drivers/gpu/drm/i915/i915_params.c | 12 +++++++++++
drivers/gpu/drm/nouveau/nouveau_drm.c | 13 ++++++++++++
include/drm/drm_print.h | 3 ++-
7 files changed, 92 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 429fcdf28836..5f091cb52de2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -38,6 +38,8 @@
#include <linux/mmu_notifier.h>
#include <linux/suspend.h>
#include <linux/cc_platform.h>
+#include <linux/fb.h>
+#include <linux/dynamic_debug.h>

#include "amdgpu.h"
#include "amdgpu_irq.h"
@@ -185,6 +187,18 @@ 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,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
struct amdgpu_mgpu_info mgpu_info = {
.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
.delayed_reset_work = __DELAYED_WORK_INITIALIZER(
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
index e5bab236b3ae..196dfb1e8d87 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -30,6 +30,7 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/string_helpers.h>
+#include <linux/dynamic_debug.h>

#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_dp_mst_helper.h>
@@ -40,6 +41,18 @@

#include "drm_dp_helper_internal.h"

+DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
struct dp_aux_backlight {
struct backlight_device *base;
struct drm_dp_aux *aux;
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 8a6d54515f92..a8cee6694cf6 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -32,6 +32,7 @@
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
+#include <linux/dynamic_debug.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
@@ -51,6 +52,18 @@

#include "drm_crtc_helper_internal.h"

+DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
/**
* DOC: overview
*
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index f783d4963d4b..ec32df35a3e3 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -40,7 +40,7 @@
* __drm_debug: Enable debug output.
* Bitmask of DRM_UT_x. See include/drm/drm_print.h for details.
*/
-unsigned int __drm_debug;
+unsigned long __drm_debug;
EXPORT_SYMBOL(__drm_debug);

MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
@@ -52,7 +52,30 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat
"\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n"
"\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n"
"\t\tBit 8 (0x100) will enable DP messages (displayport code)");
-module_param_named(debug, __drm_debug, int, 0600);
+
+#if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
+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,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
+static struct ddebug_class_param drm_debug_bitmap = {
+ .bits = &__drm_debug,
+ .flags = "p",
+ .map = &drm_debug_classes,
+};
+module_param_cb(debug, &param_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
+#endif

void __drm_puts_coredump(struct drm_printer *p, const char *str)
{
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 6fc475a5db61..d1e4d528cb17 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -29,6 +29,18 @@
#include "i915_params.h"
#include "i915_drv.h"

+DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
#define i915_param_named(name, T, perm, desc) \
module_param_named(name, i915_modparams.name, T, perm); \
MODULE_PARM_DESC(name, desc)
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 561309d447e0..fd99ec0f4257 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -28,6 +28,7 @@
#include <linux/pm_runtime.h>
#include <linux/vga_switcheroo.h>
#include <linux/mmu_notifier.h>
+#include <linux/dynamic_debug.h>

#include <drm/drm_aperture.h>
#include <drm/drm_crtc_helper.h>
@@ -70,6 +71,18 @@
#include "nouveau_svm.h"
#include "nouveau_dmem.h"

+DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
MODULE_PARM_DESC(config, "option string to pass to driver core");
static char *nouveau_config;
module_param_named(config, nouveau_config, charp, 0400);
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index b3b470440e46..668273e36c2c 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -35,7 +35,7 @@
#include <drm/drm.h>

/* Do *not* use outside of drm_print.[ch]! */
-extern unsigned int __drm_debug;
+extern unsigned long __drm_debug;

/**
* DOC: print
@@ -275,6 +275,7 @@ static inline struct drm_printer drm_err_printer(const char *prefix)
*
*/
enum drm_debug_category {
+ /* These names must match those in DYNAMIC_DEBUG_CLASSBITS */
/**
* @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c,
* drm_memory.c, ...
--
2.37.3