diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index dce631e678dd..233e3cddf6de 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -181,6 +181,10 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
 				   KERN_DEBUG, prefix_str, prefix_type,	\
 				   rowsize, groupsize, buf, len, ascii)
 
+struct kernel_param;
+int param_set_dyndbg(const char *instr, const struct kernel_param *kp);
+int param_get_dyndbg(char *buffer, const struct kernel_param *kp);
+
 #else /* !CONFIG_DYNAMIC_DEBUG_CORE */
 
 #include <linux/string.h>
@@ -227,6 +231,64 @@ static inline int dynamic_debug_exec_queries(const char *query, const char *modn
 	return 0;
 }
 
+struct kernel_param;
+static inline int param_set_dyndbg(const char *instr, const struct kernel_param *kp)
+{ return 0; }
+static inline int param_get_dyndbg(char *buffer, const struct kernel_param *kp)
+{ return 0; }
+
 #endif /* !CONFIG_DYNAMIC_DEBUG_CORE */
 
+struct dyndbg_bitdesc {
+	const char *match;	/* search format for this substr */
+};
+
+struct dyndbg_bitmap_param {
+	unsigned long *bits;		/* ref to shared state */
+	struct dyndbg_bitdesc map[];	/* indexed by bitpos */
+};
+
+#if defined(CONFIG_DYNAMIC_DEBUG) || \
+	(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
+/**
+ * DEFINE_DYNAMIC_DEBUG_CATEGORIES() - bitmap control of categorized prdbgs
+ * @fsname: parameter basename under /sys
+ * @_var:    C-identifier holding bitmap
+ * @desc:  string summarizing the controls provided
+ * @...:    list of struct dyndbg_bitdesc initializations
+ *
+ * Intended for modules with substantial use of "categorized" prdbgs
+ * (those with some systematic prefix in the format string), this lets
+ * modules using pr_debug to control them in groups according to their
+ * format prefixes, and map them to bits 0-N of a sysfs control point.
+ * Each @... gives the index and prefix map.
+ */
+#define DEFINE_DYNAMIC_DEBUG_CATEGORIES(fsname, _var, desc, ...)	\
+	MODULE_PARM_DESC(fsname, desc);					\
+	static struct dyndbg_bitmap_param ddcats_##_var =		\
+	{ .bits = &(_var), .map = { __VA_ARGS__, { .match = NULL }}};	\
+	module_param_cb(fsname, &param_ops_dyndbg, &ddcats_##_var, 0644)
+
+/* helper macros provide combos of ^prefix and ' ' postfix */
+#define _DD_cat_(N, pfx)	[N] = { .match = "^" pfx " " }
+#define _DD_cats_(N, pfx)	[N] = { .match = "^" pfx }
+#define _DD_subtr_(N, flt)	[N] = { .match = flt }
+
+extern const struct kernel_param_ops param_ops_dyndbg;
+
+#elif (defined(CONFIG_DYNAMIC_DEBUG_CORE) && !defined(DYNAMIC_DEBUG_MODULE))
+
+#define DEFINE_DYNAMIC_DEBUG_CATEGORIES(fsname, var, bitmap_desc, ...)	\
+	BUILD_BUG_ON_MSG(1, "you need -DDYNAMIC_DEBUG_MODULE in compile")
+#define _DD_cat_(pfx)
+#define _DD_cats_(N, pfx)
+#define _DD_subtr_(N, flt)
+#else
+#define DEFINE_DYNAMIC_DEBUG_CATEGORIES(fsname, var, bitmap_desc, ...)	\
+	BUILD_BUG_ON_MSG(1, "CONFIG_DYNAMIC_DEBUG needed to use this macro: " #var)
+#define _DD_cat_(pfx)
+#define _DD_cats_(pfx)
+#define _DD_subtr_(N, flt)
+#endif
+
 #endif
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 356c8231175f..03ef9865fd5d 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -580,6 +580,82 @@ int dynamic_debug_exec_queries(const char *query, const char *modname)
 }
 EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
 
+#ifdef CONFIG_MODULES
+#define KP_MOD_NAME kp->mod->name
+#else
+#define KP_MOD_NAME NULL /* wildcard */
+#endif
+#define FMT_QUERY_SIZE 128 /* typically need <40 */
+/**
+ * param_set_dyndbg - bits => categories >control setter
+ * @instr: string echo>d to sysfs
+ * @kp:    kp->arg has state: bits, map
+ *
+ * Enable/disable prdbgs by their "category", as specified in
+ * DEFINE_DYNAMIC_DEBUG_CATEGORIES arguments.
+ *
+ * Returns: 0 or <0 if error.
+ */
+int param_set_dyndbg(const char *instr, const struct kernel_param *kp)
+{
+	unsigned long inbits;
+	int rc, i, matches = 0, totct = 0;
+	char query[FMT_QUERY_SIZE];
+	const struct dyndbg_bitmap_param *p = kp->arg;
+	const struct dyndbg_bitdesc *map = p->map;
+
+	if (!map) {
+		pr_err("set_dyndbg: no bits=>queries map\n");
+		return -EINVAL;
+	}
+	rc = kstrtoul(instr, 0, &inbits);
+	if (rc) {
+		pr_err("set_dyndbg: expecting unsigned int\n");
+		return rc;
+	}
+	vpr_info("set_dyndbg: new 0x%lx old 0x%lx\n", inbits, *p->bits);
+
+	for (i = 0; map->match && i < BITS_PER_LONG; map++, i++) {
+		if (test_bit(i, &inbits) == test_bit(i, p->bits))
+			continue;
+		snprintf(query, FMT_QUERY_SIZE, "format '%s' %cp", map->match,
+			 test_bit(i, &inbits) ? '+' : '-');
+
+		matches = ddebug_exec_queries(query, KP_MOD_NAME);
+
+		v2pr_info("bit-%d: %d matches on format '%s'\n", i,
+			  matches, map->match);
+		totct += matches;
+	}
+	*p->bits = inbits;
+	vpr_info("total matches: %d\n", totct);
+	return 0;
+}
+EXPORT_SYMBOL(param_set_dyndbg);
+
+/**
+ * param_get_dyndbg - bitmap reader
+ * @buffer: receives string rep of bitmap
+ * @kp:    kp->arg has state: bits, map
+ *
+ * Reads last written bits, underlying prdbg state may have changed since.
+ * Returns: #chars written
+ */
+int param_get_dyndbg(char *buffer, const struct kernel_param *kp)
+{
+	const struct dyndbg_bitmap_param *p = kp->arg;
+	unsigned long val = *p->bits;
+
+	return scnprintf(buffer, PAGE_SIZE, "0x%lx\n", val);
+}
+EXPORT_SYMBOL(param_get_dyndbg);
+
+const struct kernel_param_ops param_ops_dyndbg = {
+	.set = param_set_dyndbg,
+	.get = param_get_dyndbg,
+};
+EXPORT_SYMBOL(param_ops_dyndbg);
+
 #define PREFIX_SIZE 64
 
 static int remaining(int wrote)
