diff --git a/drivers/char/lrng/Kconfig b/drivers/char/lrng/Kconfig
index 452ee4adb577..de20f189e297 100644
--- a/drivers/char/lrng/Kconfig
+++ b/drivers/char/lrng/Kconfig
@@ -164,4 +164,128 @@ config LRNG_APT_CUTOFF
 	default 325 if !LRNG_APT_BROKEN
 	default 32 if LRNG_APT_BROKEN
 
+menuconfig LRNG_TESTING_MENU
+	bool "LRNG testing interfaces"
+	depends on DEBUG_FS
+	help
+	  Enable one or more of the following test interfaces.
+
+	  If unsure, say N.
+
+if LRNG_TESTING_MENU
+
+config LRNG_RAW_HIRES_ENTROPY
+	bool "Enable entropy test interface to hires timer noise source"
+	default y
+	help
+	  The test interface allows a privileged process to capture
+	  the raw unconditioned high resolution time stamp noise that
+	  is collected by the LRNG for statistical analysis. Extracted
+	  noise data is not used to seed the LRNG.
+
+	  The raw noise data can be obtained using the lrng_raw_hires
+	  debugfs file. Using the option lrng_testing.boot_raw_hires_test=1
+	  the raw noise of the first 1000 entropy events since boot
+	  can be sampled.
+
+config LRNG_RAW_JIFFIES_ENTROPY
+	bool "Enable entropy test interface to Jiffies noise source"
+	help
+	  The test interface allows a privileged process to capture
+	  the raw unconditioned Jiffies that is collected by
+	  the LRNG for statistical analysis. This data is used for
+	  seeding the LRNG if a high-resolution time stamp is not
+	  available. If a high-resolution time stamp is detected,
+	  the Jiffies value is not collected by the LRNG and no
+	  data is provided via the test interface. Extracted noise
+	  data is not used to seed the random number generator.
+
+	  The raw noise data can be obtained using the lrng_raw_jiffies
+	  debugfs file. Using the option lrng_testing.boot_raw_jiffies_test=1
+	  the raw noise of the first 1000 entropy events since boot
+	  can be sampled.
+
+config LRNG_RAW_IRQ_ENTROPY
+	bool "Enable entropy test interface to IRQ number noise source"
+	help
+	  The test interface allows a privileged process to capture
+	  the raw unconditioned interrupt number that is collected by
+	  the LRNG for statistical analysis. This data is used for
+	  seeding the random32 PRNG external to the LRNG if a
+	  high-resolution time stamp is available or it will be used to
+	  seed the LRNG otherwise. Extracted noise data is not used to
+	  seed the random number generator.
+
+	  The raw noise data can be obtained using the lrng_raw_irq
+	  debugfs file. Using the option lrng_testing.boot_raw_irq_test=1
+	  the raw noise of the first 1000 entropy events since boot
+	  can be sampled.
+
+config LRNG_RAW_IRQFLAGS_ENTROPY
+	bool "Enable entropy test interface to IRQ flags noise source"
+	help
+	  The test interface allows a privileged process to capture
+	  the raw unconditioned interrupt flags that is collected by
+	  the LRNG for statistical analysis. This data is used for
+	  seeding the random32 PRNG external to the LRNG if a
+	  high-resolution time stamp is available or it will be used to
+	  seed the LRNG otherwise. Extracted noise data is not used to
+	  seed the random number generator.
+
+	  The raw noise data can be obtained using the lrng_raw_irqflags
+	  debugfs file. Using the option lrng_testing.boot_raw_irqflags_test=1
+	  the raw noise of the first 1000 entropy events since boot
+	  can be sampled.
+
+config LRNG_RAW_RETIP_ENTROPY
+	bool "Enable entropy test interface to RETIP value noise source"
+	help
+	  The test interface allows a privileged process to capture
+	  the raw unconditioned return instruction pointer value
+	  that is collected by the LRNG for statistical analysis.
+	  This data is used for seeding the random32 PRNG external
+	  to the LRNG if a high-resolution time stamp is available or
+	  it will be used to seed the LRNG otherwise. Extracted noise
+	  data is not used to seed the random number generator.
+
+	  The raw noise data can be obtained using the lrng_raw_retip
+	  debugfs file. Using the option lrng_testing.boot_raw_retip_test=1
+	  the raw noise of the first 1000 entropy events since boot
+	  can be sampled.
+
+config LRNG_RAW_ARRAY
+	bool "Enable test interface to LRNG raw entropy storage array"
+	help
+	  The test interface allows a privileged process to capture
+	  the raw noise data that is collected by the LRNG
+	  in the per-CPU array for statistical analysis. The purpose
+	  of this interface is to verify that the array handling code
+	  truly only concatenates data and provides the same entropy
+	  rate as the raw unconditioned noise source when assessing
+	  the collected data byte-wise.
+
+	  The data can be obtained using the lrng_raw_array debugfs
+	  file. Using the option lrng_testing.boot_raw_array=1
+	  the raw noise of the first 1000 entropy events since boot
+	  can be sampled.
+
+config LRNG_IRQ_PERF
+	bool "Enable LRNG interrupt performance monitor"
+	help
+	  With this option, the performance monitor of the LRNG
+	  interrupt handling code is enabled. The file provides
+	  the execution time of the interrupt handler in
+	  cycles.
+
+	  The interrupt performance data can be obtained using
+	  the lrng_irq_perf debugfs file. Using the option
+	  lrng_testing.boot_irq_perf=1 the performance data of
+	  the first 1000 entropy events since boot can be sampled.
+
+config LRNG_TESTING
+	bool
+	default y if (LRNG_RAW_HIRES_ENTROPY || LRNG_RAW_JIFFIES_ENTROPY ||LRNG_RAW_IRQ_ENTROPY || LRNG_RAW_IRQFLAGS_ENTROPY || LRNG_RAW_RETIP_ENTROPY || LRNG_RAW_ARRAY || LRNG_IRQ_PERF)
+
+endif #LRNG_TESTING_MENU
+
 endif # LRNG
diff --git a/drivers/char/lrng/Makefile b/drivers/char/lrng/Makefile
index c3008763dd14..b2ce1979dc4b 100644
--- a/drivers/char/lrng/Makefile
+++ b/drivers/char/lrng/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_LRNG_DRBG)		+= lrng_drbg.o
 obj-$(CONFIG_LRNG_KCAPI)	+= lrng_kcapi.o
 obj-$(CONFIG_LRNG_JENT)		+= lrng_jent.o
 obj-$(CONFIG_LRNG_HEALTH_TESTS)	+= lrng_health.o
+obj-$(CONFIG_LRNG_TESTING)	+= lrng_testing.o
diff --git a/drivers/char/lrng/lrng_testing.c b/drivers/char/lrng/lrng_testing.c
new file mode 100644
index 000000000000..a6e2c2b56fe2
--- /dev/null
+++ b/drivers/char/lrng/lrng_testing.c
@@ -0,0 +1,575 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+/*
+ * Linux Random Number Generator (LRNG) testing interfaces
+ *
+ * Copyright (C) 2019 - 2020, Stephan Mueller <smueller@chronox.de>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/atomic.h>
+#include <linux/bug.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/workqueue.h>
+#include <asm/errno.h>
+
+#include "lrng_internal.h"
+
+#define LRNG_TESTING_RINGBUFFER_SIZE	1024
+#define LRNG_TESTING_RINGBUFFER_MASK	(LRNG_TESTING_RINGBUFFER_SIZE - 1)
+
+struct lrng_testing {
+	u32 lrng_testing_rb[LRNG_TESTING_RINGBUFFER_SIZE];
+	u32 rb_reader;
+	u32 rb_writer;
+	atomic_t lrng_testing_enabled;
+	spinlock_t lock;
+	wait_queue_head_t read_wait;
+};
+
+/*************************** Generic Data Handling ****************************/
+
+/*
+ * boot variable:
+ * 0 ==> No boot test, gathering of runtime data allowed
+ * 1 ==> Boot test enabled and ready for collecting data, gathering runtime
+ *	 data is disabled
+ * 2 ==> Boot test completed and disabled, gathering of runtime data is
+ *	 disabled
+ */
+
+static inline void lrng_testing_reset(struct lrng_testing *data)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&data->lock, flags);
+	data->rb_reader = 0;
+	data->rb_writer = 0;
+	spin_unlock_irqrestore(&data->lock, flags);
+}
+
+static inline void lrng_testing_init(struct lrng_testing *data, u32 boot)
+{
+	/*
+	 * The boot time testing implies we have a running test. If the
+	 * caller wants to clear it, he has to unset the boot_test flag
+	 * at runtime via sysfs to enable regular runtime testing
+	 */
+	if (boot)
+		return;
+
+	lrng_testing_reset(data);
+	atomic_set(&data->lrng_testing_enabled, 1);
+	pr_warn("Enabling data collection\n");
+}
+
+static inline void lrng_testing_fini(struct lrng_testing *data)
+{
+	atomic_set(&data->lrng_testing_enabled, 0);
+	lrng_testing_reset(data);
+	pr_warn("Disabling data collection\n");
+}
+
+
+static inline bool lrng_testing_store(struct lrng_testing *data, u32 value,
+				      u32 *boot)
+{
+	unsigned long flags;
+
+	if (!atomic_read(&data->lrng_testing_enabled) && (*boot != 1))
+		return false;
+
+	spin_lock_irqsave(&data->lock, flags);
+
+	/*
+	 * Disable entropy testing for boot time testing after ring buffer
+	 * is filled.
+	 */
+	if (*boot) {
+		if (data->rb_writer > LRNG_TESTING_RINGBUFFER_SIZE) {
+			*boot = 2;
+			pr_warn_once("One time data collection test disabled\n");
+			spin_unlock_irqrestore(&data->lock, flags);
+			return false;
+		}
+
+		if (data->rb_writer == 1)
+			pr_warn("One time data collection test enabled\n");
+	}
+
+	data->lrng_testing_rb[data->rb_writer & LRNG_TESTING_RINGBUFFER_MASK] =
+									value;
+	data->rb_writer++;
+
+	spin_unlock_irqrestore(&data->lock, flags);
+
+	if (wq_has_sleeper(&data->read_wait))
+		wake_up_interruptible(&data->read_wait);
+
+	return true;
+}
+
+static inline bool lrng_testing_have_data(struct lrng_testing *data)
+{
+	return ((data->rb_writer & LRNG_TESTING_RINGBUFFER_MASK) !=
+		 (data->rb_reader & LRNG_TESTING_RINGBUFFER_MASK));
+}
+
+static inline int lrng_testing_reader(struct lrng_testing *data, u32 *boot,
+				      u8 *outbuf, u32 outbuflen)
+{
+	unsigned long flags;
+	int collected_data = 0;
+
+	lrng_testing_init(data, *boot);
+
+	while (outbuflen) {
+		spin_lock_irqsave(&data->lock, flags);
+
+		/* We have no data or reached the writer. */
+		if (!data->rb_writer ||
+		    (data->rb_writer == data->rb_reader)) {
+
+			spin_unlock_irqrestore(&data->lock, flags);
+
+			/*
+			 * Now we gathered all boot data, enable regular data
+			 * collection.
+			 */
+			if (*boot) {
+				*boot = 0;
+				goto out;
+			}
+
+			wait_event_interruptible(data->read_wait,
+						 lrng_testing_have_data(data));
+			if (signal_pending(current)) {
+				collected_data = -ERESTARTSYS;
+				goto out;
+			}
+
+			continue;
+		}
+
+		/* We copy out word-wise */
+		if (outbuflen < sizeof(u32)) {
+			spin_unlock_irqrestore(&data->lock, flags);
+			goto out;
+		}
+
+		memcpy(outbuf, &data->lrng_testing_rb[data->rb_reader],
+		       sizeof(u32));
+		data->rb_reader++;
+
+		spin_unlock_irqrestore(&data->lock, flags);
+
+		outbuf += sizeof(u32);
+		outbuflen -= sizeof(u32);
+		collected_data += sizeof(u32);
+	}
+
+out:
+	if (!lrng_testing_have_data(data))
+		lrng_testing_fini(data);
+	return collected_data;
+}
+
+static int lrng_testing_extract_user(struct file *file, char __user *buf,
+				     size_t nbytes, loff_t *ppos,
+				     int (*reader)(u8 *outbuf, u32 outbuflen))
+{
+	loff_t pos = *ppos;
+	u8 *tmp, *tmp_aligned;
+	int ret = 0, large_request = (nbytes > 256);
+
+	if (!nbytes)
+		return 0;
+
+	/*
+	 * The intention of this interface is for collecting at least
+	 * 1000 samples due to the SP800-90B requirements. So, we make no
+	 * effort in avoiding allocating more memory that actually needed
+	 * by the user. Hence, we allocate sufficient memory to always hold
+	 * that amount of data.
+	 */
+	tmp = kmalloc(LRNG_TESTING_RINGBUFFER_SIZE + sizeof(u32), GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	tmp_aligned = PTR_ALIGN(tmp, sizeof(u32));
+
+	while (nbytes) {
+		int i;
+
+		if (large_request && need_resched()) {
+			if (signal_pending(current)) {
+				if (ret == 0)
+					ret = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+		}
+
+		i = min_t(int, nbytes, LRNG_TESTING_RINGBUFFER_SIZE);
+		i = reader(tmp_aligned, i);
+		if (i <= 0) {
+			if (i < 0)
+				ret = i;
+			break;
+		}
+		if (copy_to_user(buf, tmp_aligned, i)) {
+			ret = -EFAULT;
+			break;
+		}
+
+		nbytes -= i;
+		buf += i;
+		ret += i;
+	}
+
+	kzfree(tmp);
+
+	nbytes -= ret;
+	*ppos = pos + nbytes;
+
+	return ret;
+}
+
+/************** Raw High-Resolution Timer Entropy Data Handling ***************/
+
+#ifdef CONFIG_LRNG_RAW_HIRES_ENTROPY
+
+static u32 boot_raw_hires_test = 0;
+module_param(boot_raw_hires_test, uint, 0644);
+MODULE_PARM_DESC(boot_raw_hires_test, "Enable gathering boot time high resolution timer entropy of the first entropy events");
+
+static struct lrng_testing lrng_raw_hires = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_raw_hires.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_raw_hires.read_wait)
+};
+
+bool lrng_raw_hires_entropy_store(u32 value)
+{
+	return lrng_testing_store(&lrng_raw_hires, value, &boot_raw_hires_test);
+}
+
+static int lrng_raw_hires_entropy_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_raw_hires, &boot_raw_hires_test,
+				   outbuf, outbuflen);
+}
+
+static ssize_t lrng_raw_hires_read(struct file *file, char __user *to,
+				   size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_raw_hires_entropy_reader);
+}
+
+static const struct file_operations lrng_raw_hires_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_raw_hires_read,
+};
+
+#endif /* CONFIG_LRNG_RAW_HIRES_ENTROPY */
+
+/********************* Raw Jiffies Entropy Data Handling **********************/
+
+#ifdef CONFIG_LRNG_RAW_JIFFIES_ENTROPY
+
+static u32 boot_raw_jiffies_test = 0;
+module_param(boot_raw_jiffies_test, uint, 0644);
+MODULE_PARM_DESC(boot_raw_jiffies_test, "Enable gathering boot time high resolution timer entropy of the first entropy events");
+
+static struct lrng_testing lrng_raw_jiffies = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_raw_jiffies.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_raw_jiffies.read_wait)
+};
+
+bool lrng_raw_jiffies_entropy_store(u32 value)
+{
+	return lrng_testing_store(&lrng_raw_jiffies, value,
+				  &boot_raw_jiffies_test);
+}
+
+static int lrng_raw_jiffies_entropy_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_raw_jiffies, &boot_raw_jiffies_test,
+				   outbuf, outbuflen);
+}
+
+static ssize_t lrng_raw_jiffies_read(struct file *file, char __user *to,
+				   size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_raw_jiffies_entropy_reader);
+}
+
+static const struct file_operations lrng_raw_jiffies_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_raw_jiffies_read,
+};
+
+#endif /* CONFIG_LRNG_RAW_JIFFIES_ENTROPY */
+
+/************************** Raw IRQ Data Handling ****************************/
+
+#ifdef CONFIG_LRNG_RAW_IRQ_ENTROPY
+
+static u32 boot_raw_irq_test = 0;
+module_param(boot_raw_irq_test, uint, 0644);
+MODULE_PARM_DESC(boot_raw_irq_test, "Enable gathering boot time entropy of the first IRQ entropy events");
+
+static struct lrng_testing lrng_raw_irq = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_raw_irq.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_raw_irq.read_wait)
+};
+
+bool lrng_raw_irq_entropy_store(u32 value)
+{
+	return lrng_testing_store(&lrng_raw_irq, value, &boot_raw_irq_test);
+}
+
+static int lrng_raw_irq_entropy_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_raw_irq, &boot_raw_irq_test, outbuf,
+				   outbuflen);
+}
+
+static ssize_t lrng_raw_irq_read(struct file *file, char __user *to,
+				 size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_raw_irq_entropy_reader);
+}
+
+static const struct file_operations lrng_raw_irq_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_raw_irq_read,
+};
+
+#endif /* CONFIG_LRNG_RAW_IRQ_ENTROPY */
+
+/************************ Raw IRQFLAGS Data Handling **************************/
+
+#ifdef CONFIG_LRNG_RAW_IRQFLAGS_ENTROPY
+
+static u32 boot_raw_irqflags_test = 0;
+module_param(boot_raw_irqflags_test, uint, 0644);
+MODULE_PARM_DESC(boot_raw_irqflags_test, "Enable gathering boot time entropy of the first IRQ flags entropy events");
+
+static struct lrng_testing lrng_raw_irqflags = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_raw_irqflags.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_raw_irqflags.read_wait)
+};
+
+bool lrng_raw_irqflags_entropy_store(u32 value)
+{
+	return lrng_testing_store(&lrng_raw_irqflags, value,
+				  &boot_raw_irqflags_test);
+}
+
+static int lrng_raw_irqflags_entropy_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_raw_irqflags, &boot_raw_irqflags_test,
+				   outbuf, outbuflen);
+}
+
+static ssize_t lrng_raw_irqflags_read(struct file *file, char __user *to,
+				      size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_raw_irqflags_entropy_reader);
+}
+
+static const struct file_operations lrng_raw_irqflags_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_raw_irqflags_read,
+};
+
+#endif /* CONFIG_LRNG_RAW_IRQFLAGS_ENTROPY */
+
+/************************ Raw _RET_IP_ Data Handling **************************/
+
+#ifdef CONFIG_LRNG_RAW_RETIP_ENTROPY
+
+static u32 boot_raw_retip_test = 0;
+module_param(boot_raw_retip_test, uint, 0644);
+MODULE_PARM_DESC(boot_raw_retip_test, "Enable gathering boot time entropy of the first return instruction pointer entropy events");
+
+static struct lrng_testing lrng_raw_retip = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_raw_retip.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_raw_retip.read_wait)
+};
+
+bool lrng_raw_retip_entropy_store(u32 value)
+{
+	return lrng_testing_store(&lrng_raw_retip, value, &boot_raw_retip_test);
+}
+
+static int lrng_raw_retip_entropy_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_raw_retip, &boot_raw_retip_test,
+				   outbuf, outbuflen);
+}
+
+static ssize_t lrng_raw_retip_read(struct file *file, char __user *to,
+				   size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_raw_retip_entropy_reader);
+}
+
+static const struct file_operations lrng_raw_retip_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_raw_retip_read,
+};
+
+#endif /* CONFIG_LRNG_RAW_RETIP_ENTROPY */
+
+/********************** Raw Entropy Array Data Handling ***********************/
+
+#ifdef CONFIG_LRNG_RAW_ARRAY
+
+static u32 boot_raw_array = 0;
+module_param(boot_raw_array, uint, 0644);
+MODULE_PARM_DESC(boot_raw_array, "Enable gathering boot time raw noise array data of the first entropy events");
+
+static struct lrng_testing lrng_raw_array = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_raw_array.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_raw_array.read_wait)
+};
+
+bool lrng_raw_array_entropy_store(u32 value)
+{
+	return lrng_testing_store(&lrng_raw_array, value, &boot_raw_array);
+}
+
+static int lrng_raw_array_entropy_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_raw_array, &boot_raw_array, outbuf,
+				   outbuflen);
+}
+
+static ssize_t lrng_raw_array_read(struct file *file, char __user *to,
+				   size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_raw_array_entropy_reader);
+}
+
+static const struct file_operations lrng_raw_array_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_raw_array_read,
+};
+
+#endif /* CONFIG_LRNG_RAW_ARRAY */
+
+/******************** Interrupt Performance Data Handling *********************/
+
+#ifdef CONFIG_LRNG_IRQ_PERF
+
+static u32 boot_irq_perf = 0;
+module_param(boot_irq_perf, uint, 0644);
+MODULE_PARM_DESC(boot_irq_perf, "Enable gathering boot time interrupt performance data of the first entropy events");
+
+static struct lrng_testing lrng_irq_perf = {
+	.rb_reader = 0,
+	.rb_writer = 0,
+	.lock      = __SPIN_LOCK_UNLOCKED(lrng_irq_perf.lock),
+	.read_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lrng_irq_perf.read_wait)
+};
+
+bool lrng_perf_time(u32 start)
+{
+	return lrng_testing_store(&lrng_irq_perf, random_get_entropy() - start,
+				  &boot_irq_perf);
+}
+
+static int lrng_irq_perf_reader(u8 *outbuf, u32 outbuflen)
+{
+	return lrng_testing_reader(&lrng_irq_perf, &boot_irq_perf, outbuf,
+				   outbuflen);
+}
+
+static ssize_t lrng_irq_perf_read(struct file *file, char __user *to,
+				  size_t count, loff_t *ppos)
+{
+	return lrng_testing_extract_user(file, to, count, ppos,
+					 lrng_irq_perf_reader);
+}
+
+static const struct file_operations lrng_irq_perf_fops = {
+	.owner = THIS_MODULE,
+	.read = lrng_irq_perf_read,
+};
+
+#endif /* CONFIG_LRNG_IRQ_PERF */
+
+/**************************************************************************
+ * Debugfs interface
+ **************************************************************************/
+
+static int __init lrng_raw_init(void)
+{
+	struct dentry *lrng_raw_debugfs_root;
+
+	lrng_raw_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
+
+#ifdef CONFIG_LRNG_RAW_HIRES_ENTROPY
+	debugfs_create_file_unsafe("lrng_raw_hires", 0400,
+				   lrng_raw_debugfs_root, NULL,
+				   &lrng_raw_hires_fops);
+#endif
+#ifdef CONFIG_LRNG_RAW_JIFFIES_ENTROPY
+	debugfs_create_file_unsafe("lrng_raw_jiffies", 0400,
+				   lrng_raw_debugfs_root, NULL,
+				   &lrng_raw_jiffies_fops);
+#endif
+#ifdef CONFIG_LRNG_RAW_IRQ_ENTROPY
+	debugfs_create_file_unsafe("lrng_raw_irq", 0400, lrng_raw_debugfs_root,
+				   NULL, &lrng_raw_irq_fops);
+#endif
+#ifdef CONFIG_LRNG_RAW_IRQFLAGS_ENTROPY
+	debugfs_create_file_unsafe("lrng_raw_irqflags", 0400,
+				   lrng_raw_debugfs_root, NULL,
+				   &lrng_raw_irqflags_fops);
+#endif
+#ifdef CONFIG_LRNG_RAW_RETIP_ENTROPY
+	debugfs_create_file_unsafe("lrng_raw_retip", 0400,
+				   lrng_raw_debugfs_root, NULL,
+				   &lrng_raw_retip_fops);
+#endif
+#ifdef CONFIG_LRNG_RAW_ARRAY
+	debugfs_create_file_unsafe("lrng_raw_array", 0400,
+				   lrng_raw_debugfs_root, NULL,
+				   &lrng_raw_array_fops);
+#endif
+#ifdef CONFIG_LRNG_IRQ_PERF
+	debugfs_create_file_unsafe("lrng_irq_perf", 0400, lrng_raw_debugfs_root,
+				   NULL, &lrng_irq_perf_fops);
+#endif
+
+	return 0;
+}
+
+module_init(lrng_raw_init);
