[PATCH v4 41/41] nouveau-dyndbg: wip subdev refine, breaks on use

[Jim Cromie <jim.cromie@gmail.com>]

Change nvkm_subdev.debug to a ulong, so dyndbg can maybe use it.

Move macro decl from nv-drm.c to subdev.c, and add a struct
ddebug_classes_bitmap_param and a module_param_cb() that creates the
sysfs-knob.

Finally, in nvkm_subdev_ctor(), *attempt* to set dyndbg's pointer to
the debug address, so that dyndbg can observe the underlying debug
value, and make enable/disable decisions based upon it.

But Im not getting the ctor called, so the ptr is NULL when refd.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 .../drm/nouveau/include/nvkm/core/subdev.h    |  2 +-
 drivers/gpu/drm/nouveau/nouveau_drm.c         |  7 ------
 drivers/gpu/drm/nouveau/nvkm/core/subdev.c    | 23 +++++++++++++++++++
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h b/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h
index d5f6ca05d5fa..05807403fdd6 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/core/subdev.h
@@ -19,7 +19,7 @@ struct nvkm_subdev {
 	enum nvkm_subdev_type type;
 	int inst;
 	char name[16];
-	u32 debug;
+	unsigned long debug;
 	struct list_head head;
 
 	void **pself;
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 85b63b527877..d45c71ffc09e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -90,13 +90,6 @@ DECLARE_DYNDBG_CLASSMAP(nv_cli_debug_verbose, DD_CLASS_TYPE_VERBOSE, 10,
 			"NV_CLI_DBG_TRACE",
 			"NV_CLI_DBG_SPAM");
 
-DECLARE_DYNDBG_CLASSMAP(nv_subdev_debug_verbose, DD_CLASS_TYPE_VERBOSE, 15,
-			"NV_SUBDEV_DBG_OFF",
-			"NV_SUBDEV_DBG_INFO",
-			"NV_SUBDEV_DBG_DEBUG",
-			"NV_SUBDEV_DBG_TRACE",
-			"NV_SUBDEV_DBG_SPAM");
-
 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/drivers/gpu/drm/nouveau/nvkm/core/subdev.c b/drivers/gpu/drm/nouveau/nvkm/core/subdev.c
index a74b7acb6832..227871c3a749 100644
--- a/drivers/gpu/drm/nouveau/nvkm/core/subdev.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/subdev.c
@@ -26,6 +26,27 @@
 #include <core/option.h>
 #include <subdev/mc.h>
 
+#include <linux/dynamic_debug.h>
+#include <linux/module.h>
+
+#define DEBUG
+
+DECLARE_DYNDBG_CLASSMAP(nv_subdev_debug_verbose, DD_CLASS_TYPE_VERBOSE, 15,
+			"NV_SUBDEV_DBG_OFF",
+			"NV_SUBDEV_DBG_INFO",
+			"NV_SUBDEV_DBG_DEBUG",
+			"NV_SUBDEV_DBG_TRACE",
+			"NV_SUBDEV_DBG_SPAM");
+
+static struct ddebug_classes_bitmap_param nv_subdev_verbose = {
+	.bits = NULL, // wants &_subdev->debug
+	.flags = "p",
+	.map = &nv_subdev_debug_verbose,
+};
+module_param_cb(debug_subdev, &param_ops_dyndbg_classes, &nv_subdev_verbose, 0600);
+
+
+
 const char *
 nvkm_subdev_type[NVKM_SUBDEV_NR] = {
 #define NVKM_LAYOUT_ONCE(type,data,ptr,...) [type] = #ptr,
@@ -180,6 +201,8 @@ nvkm_subdev_ctor(const struct nvkm_subdev_func *func, struct nvkm_device *device
 	else
 		strscpy(subdev->name, nvkm_subdev_type[type], sizeof(subdev->name));
 	subdev->debug = nvkm_dbgopt(device->dbgopt, subdev->name);
+	nv_subdev_verbose.bits = &subdev->debug;
+	pr_debug("updated bitmap: %px\n", &nv_subdev_verbose.bits);
 	list_add_tail(&subdev->head, &device->subdev);
 }
 
-- 
2.36.1