Message-ID: <1425912115-27398-6-git-send-email-Emilian.Medve@Freescale.com>
Date:	Mon, 9 Mar 2015 09:41:50 -0500
From:	Emil Medve <Emilian.Medve@...escale.com>
To:	<scottwood@...escale.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
CC:	Geoff Thorpe <Geoff.Thorpe@...escale.com>
Subject: [RFC v3 05/10] fsl_bman: Add self-tester

From: Geoff Thorpe <Geoff.Thorpe@...escale.com>

Signed-off-by: Geoff Thorpe <Geoff.Thorpe@...escale.com>
---
 drivers/soc/fsl/Kconfig            |  26 +++++
 drivers/soc/fsl/Makefile           |   4 +
 drivers/soc/fsl/bman_test.c        |  55 +++++++++++
 drivers/soc/fsl/bman_test.h        |  43 ++++++++
 drivers/soc/fsl/bman_test_api.c    | 180 ++++++++++++++++++++++++++++++++++
 drivers/soc/fsl/bman_test_thresh.c | 195 +++++++++++++++++++++++++++++++++++++
 6 files changed, 503 insertions(+)
 create mode 100644 drivers/soc/fsl/bman_test.c
 create mode 100644 drivers/soc/fsl/bman_test.h
 create mode 100644 drivers/soc/fsl/bman_test_api.c
 create mode 100644 drivers/soc/fsl/bman_test_thresh.c

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
index 73fdfb8..4abf25b 100644
--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig
@@ -47,6 +47,32 @@ config FSL_BMAN_CONFIG
 	  linux image is running as a guest OS under the hypervisor, only one
 	  guest OS ("the control plane") needs this option.
 
+config FSL_BMAN_TEST
+	tristate "BMan self-tests"
+	default n
+	---help---
+	  This option compiles self-test code for BMan.
+
+config FSL_BMAN_TEST_HIGH
+	bool "BMan high-level self-test"
+	depends on FSL_BMAN_TEST
+	default y
+	---help---
+	  This requires the presence of cpu-affine portals, and performs
+	  high-level API testing with them (whichever portal(s) are affine to
+	  the cpu(s) the test executes on).
+
+config FSL_BMAN_TEST_THRESH
+	bool "BMan threshold test"
+	depends on FSL_BMAN_TEST
+	default y
+	---help---
+	  Multi-threaded (SMP) test of BMan pool depletion. A pool is seeded
+	  before multiple threads (one per cpu) create pool objects to track
+	  depletion state changes. The pool is then drained to empty by a
+	  "drainer" thread, and the other threads that they observe exactly
+	  the depletion state changes that are expected.
+
 endif # FSL_BMAN
 
 config FSL_QMAN
diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index d53627d..55e62f1 100644
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -4,6 +4,10 @@ obj-$(CONFIG_HAS_FSL_QBMAN)			+= qbman_driver.o
 
 obj-$(CONFIG_FSL_BMAN)				+= bman_api.o
 obj-$(CONFIG_FSL_BMAN_CONFIG)			+= bman.o bman_portal.o
+obj-$(CONFIG_FSL_BMAN_TEST)			+= bman_tester.o
+bman_tester-y					 = bman_test.o
+bman_tester-$(CONFIG_FSL_BMAN_TEST_API)		+= bman_test_api.o
+bman_tester-$(CONFIG_FSL_BMAN_TEST_THRESH)	+= bman_test_thresh.o
 
 obj-$(CONFIG_FSL_QMAN)				+= qman_api.o qman_utils.o
 obj-$(CONFIG_FSL_QMAN_CONFIG)			+= qman.o qman_portal.o
diff --git a/drivers/soc/fsl/bman_test.c b/drivers/soc/fsl/bman_test.c
new file mode 100644
index 0000000..d09f4e1
--- /dev/null
+++ b/drivers/soc/fsl/bman_test.c
@@ -0,0 +1,55 @@
+/* Copyright 2008 - 2015 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "bman_test.h"
+
+MODULE_AUTHOR("Geoff Thorpe");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("BMan testing");
+
+static int test_init(void)
+{
+#ifdef CONFIG_FSL_BMAN_TEST_HIGH
+	int loop = 1;
+	while (loop--)
+		bman_test_api();
+#endif
+#ifdef CONFIG_FSL_BMAN_TEST_THRESH
+	bman_test_thresh();
+#endif
+	return 0;
+}
+
+static void test_exit(void)
+{
+}
+
+module_init(test_init);
+module_exit(test_exit);
diff --git a/drivers/soc/fsl/bman_test.h b/drivers/soc/fsl/bman_test.h
new file mode 100644
index 0000000..b36c203
--- /dev/null
+++ b/drivers/soc/fsl/bman_test.h
@@ -0,0 +1,43 @@
+/* Copyright 2008 - 2015 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+
+#include <soc/fsl/bman.h>
+
+void bman_test_api(void);
+void bman_test_thresh(void);
diff --git a/drivers/soc/fsl/bman_test_api.c b/drivers/soc/fsl/bman_test_api.c
new file mode 100644
index 0000000..f19d4f0
--- /dev/null
+++ b/drivers/soc/fsl/bman_test_api.c
@@ -0,0 +1,180 @@
+/* Copyright 2008 - 2015 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "bman_test.h"
+#include "bman_priv.h"
+
+/*************/
+/* constants */
+/*************/
+
+#define PORTAL_OPAQUE	((void *)0xf00dbeef)
+#define POOL_OPAQUE	((void *)0xdeadabba)
+#define NUM_BUFS	93
+#define LOOPS		3
+#define BMAN_TOKEN_MASK 0x00FFFFFFFFFFLLU
+
+/***************/
+/* global vars */
+/***************/
+
+static struct bman_pool *pool;
+static int depleted;
+static struct bm_buffer bufs_in[NUM_BUFS] ____cacheline_aligned;
+static struct bm_buffer bufs_out[NUM_BUFS] ____cacheline_aligned;
+static int bufs_received;
+
+/* Predeclare the callback so we can instantiate pool parameters */
+static void depletion_cb(struct bman_portal *, struct bman_pool *, void *, int);
+
+/**********************/
+/* internal functions */
+/**********************/
+
+static void bufs_init(void)
+{
+	int i;
+	for (i = 0; i < NUM_BUFS; i++)
+		bm_buffer_set64(&bufs_in[i], 0xfedc01234567LLU * i);
+	bufs_received = 0;
+}
+
+static inline int bufs_cmp(const struct bm_buffer *a, const struct bm_buffer *b)
+{
+	if ((bman_ip_rev == BMAN_REV20) || (bman_ip_rev == BMAN_REV21)) {
+
+		/* On SoCs with BMan revison 2.0, BMan only respects the 40
+		 * LS-bits of buffer addresses, masking off the upper 8-bits on
+		 * release commands. The API provides for 48-bit addresses
+		 * because some SoCs support all 48-bits. When generating
+		 * garbage addresses for testing, we either need to zero the
+		 * upper 8-bits when releasing to BMan (otherwise we'll be
+		 * disappointed when the buffers we acquire back from BMan
+		 * don't match), or we need to mask the upper 8-bits off when
+		 * comparing. We do the latter.
+		 */
+		if ((bm_buffer_get64(a) & BMAN_TOKEN_MASK)
+				< (bm_buffer_get64(b) & BMAN_TOKEN_MASK))
+			return -1;
+		if ((bm_buffer_get64(a) & BMAN_TOKEN_MASK)
+				> (bm_buffer_get64(b) & BMAN_TOKEN_MASK))
+			return 1;
+	} else {
+		if (bm_buffer_get64(a) < bm_buffer_get64(b))
+			return -1;
+		if (bm_buffer_get64(a) > bm_buffer_get64(b))
+			return 1;
+	}
+
+	return 0;
+}
+
+static void bufs_confirm(void)
+{
+	int i, j;
+	for (i = 0; i < NUM_BUFS; i++) {
+		int matches = 0;
+		for (j = 0; j < NUM_BUFS; j++)
+			if (!bufs_cmp(&bufs_in[i], &bufs_out[j]))
+				matches++;
+		BUG_ON(matches != 1);
+	}
+}
+
+/********/
+/* test */
+/********/
+
+static void depletion_cb(struct bman_portal *__portal, struct bman_pool *__pool,
+			void *pool_ctx, int __depleted)
+{
+	BUG_ON(__pool != pool);
+	BUG_ON(pool_ctx != POOL_OPAQUE);
+	depleted = __depleted;
+}
+
+void bman_test_api(void)
+{
+	struct bman_pool_params pparams = {
+		.flags = BMAN_POOL_FLAG_DEPLETION | BMAN_POOL_FLAG_DYNAMIC_BPID,
+		.cb = depletion_cb,
+		.cb_ctx = POOL_OPAQUE,
+	};
+	int i, loops = LOOPS;
+
+	bufs_init();
+
+	pr_info("BMAN:	--- starting high-level test ---\n");
+
+	pool = bman_new_pool(&pparams);
+	BUG_ON(!pool);
+
+	/*******************/
+	/* Release buffers */
+	/*******************/
+do_loop:
+	i = 0;
+	while (i < NUM_BUFS) {
+		u32 flags = BMAN_RELEASE_FLAG_WAIT;
+		int num = 8;
+		if ((i + num) > NUM_BUFS)
+			num = NUM_BUFS - i;
+		if ((i + num) == NUM_BUFS)
+			flags |= BMAN_RELEASE_FLAG_WAIT_SYNC;
+		if (bman_release(pool, bufs_in + i, num, flags))
+			panic("bman_release() failed\n");
+		i += num;
+	}
+
+	/*******************/
+	/* Acquire buffers */
+	/*******************/
+	while (i > 0) {
+		int tmp, num = 8;
+		if (num > i)
+			num = i;
+		tmp = bman_acquire(pool, bufs_out + i - num, num, 0);
+		BUG_ON(tmp != num);
+		i -= num;
+	}
+	i = bman_acquire(pool, NULL, 1, 0);
+	BUG_ON(i > 0);
+
+	bufs_confirm();
+
+	if (--loops)
+		goto do_loop;
+
+	/************/
+	/* Clean up */
+	/************/
+	bman_free_pool(pool);
+	pr_info("BMAN:	--- finished high-level test ---\n");
+}
diff --git a/drivers/soc/fsl/bman_test_thresh.c b/drivers/soc/fsl/bman_test_thresh.c
new file mode 100644
index 0000000..872383d
--- /dev/null
+++ b/drivers/soc/fsl/bman_test_thresh.c
@@ -0,0 +1,195 @@
+/* Copyright 2010 - 2015 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "bman_test.h"
+
+/* Test constants */
+#define TEST_NUMBUFS	129728
+#define TEST_EXIT	129536
+#define TEST_ENTRY	129024
+
+struct affine_test_data {
+	struct task_struct *t;
+	int cpu;
+	int expect_affinity;
+	int drain;
+	int num_enter;
+	int num_exit;
+	struct list_head node;
+	struct completion wakethread;
+	struct completion wakeparent;
+};
+
+static void cb_depletion(struct bman_portal *portal,
+			struct bman_pool *pool,
+			void *opaque,
+			int depleted)
+{
+	struct affine_test_data *data = opaque;
+	int c = smp_processor_id();
+	pr_info("cb_depletion: bpid=%d, depleted=%d, cpu=%d, original=%d\n",
+		bman_get_params(pool)->bpid, !!depleted, c, data->cpu);
+	/* We should be executing on the CPU of the thread that owns the pool if
+	 * and that CPU has an affine portal (ie. it isn't slaved). */
+	BUG_ON((c != data->cpu) && data->expect_affinity);
+	BUG_ON((c == data->cpu) && !data->expect_affinity);
+	if (depleted)
+		data->num_enter++;
+	else
+		data->num_exit++;
+}
+
+/* Params used to set up a pool, this also dynamically allocates a BPID */
+static const struct bman_pool_params params_nocb = {
+	.flags = BMAN_POOL_FLAG_DYNAMIC_BPID | BMAN_POOL_FLAG_THRESH,
+	.thresholds = { TEST_ENTRY, TEST_EXIT, 0, 0 }
+};
+
+/* Params used to set up each cpu's pool with callbacks enabled */
+static struct bman_pool_params params_cb = {
+	.bpid = 0, /* will be replaced to match pool_nocb */
+	.flags = BMAN_POOL_FLAG_DEPLETION,
+	.cb = cb_depletion
+};
+
+static struct bman_pool *pool_nocb;
+static LIST_HEAD(threads);
+
+static int affine_test(void *__data)
+{
+	struct bman_pool *pool;
+	struct affine_test_data *data = __data;
+	struct bman_pool_params my_params = params_cb;
+
+	pr_info("thread %d: starting\n", data->cpu);
+	/* create the pool */
+	my_params.cb_ctx = data;
+	pool = bman_new_pool(&my_params);
+	BUG_ON(!pool);
+	complete(&data->wakeparent);
+	wait_for_completion(&data->wakethread);
+	init_completion(&data->wakethread);
+
+	/* if we're the drainer, we get signalled for that */
+	if (data->drain) {
+		struct bm_buffer buf;
+		int ret;
+		pr_info("thread %d: draining...\n", data->cpu);
+		do {
+			ret = bman_acquire(pool, &buf, 1, 0);
+		} while (ret > 0);
+		pr_info("thread %d: draining done.\n", data->cpu);
+		complete(&data->wakeparent);
+		wait_for_completion(&data->wakethread);
+		init_completion(&data->wakethread);
+	}
+
+	/* cleanup */
+	bman_free_pool(pool);
+	while (!kthread_should_stop())
+		cpu_relax();
+	pr_info("thread %d: exiting\n", data->cpu);
+	return 0;
+}
+
+static struct affine_test_data *start_affine_test(int cpu, int drain)
+{
+	struct affine_test_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
+
+	if (!data)
+		return NULL;
+	data->cpu = cpu;
+	data->expect_affinity = cpumask_test_cpu(cpu, bman_affine_cpus());
+	data->drain = drain;
+	data->num_enter = 0;
+	data->num_exit = 0;
+	init_completion(&data->wakethread);
+	init_completion(&data->wakeparent);
+	list_add_tail(&data->node, &threads);
+	data->t = kthread_create(affine_test, data, "threshtest%d", cpu);
+	BUG_ON(IS_ERR(data->t));
+	kthread_bind(data->t, cpu);
+	wake_up_process(data->t);
+	return data;
+}
+
+void bman_test_thresh(void)
+{
+	int loop = TEST_NUMBUFS;
+	int ret, num_cpus = 0;
+	struct affine_test_data *data, *drainer = NULL;
+
+	pr_info("bman_test_thresh: start\n");
+
+	/* allocate a BPID and seed it */
+	pool_nocb = bman_new_pool(&params_nocb);
+	BUG_ON(!pool_nocb);
+	while (loop--) {
+		struct bm_buffer buf;
+		bm_buffer_set64(&buf, 0x0badbeef + loop);
+		ret = bman_release(pool_nocb, &buf, 1,
+					BMAN_RELEASE_FLAG_WAIT);
+		BUG_ON(ret);
+	}
+	while (!bman_rcr_is_empty())
+		cpu_relax();
+	pr_info("bman_test_thresh: buffers are in\n");
+
+	/* create threads and wait for them to create pools */
+	params_cb.bpid = bman_get_params(pool_nocb)->bpid;
+	for_each_cpu(loop, cpu_online_mask) {
+		data = start_affine_test(loop, drainer ? 0 : 1);
+		BUG_ON(!data);
+		if (!drainer)
+			drainer = data;
+		num_cpus++;
+		wait_for_completion(&data->wakeparent);
+	}
+
+	/* signal the drainer to start draining */
+	complete(&drainer->wakethread);
+	wait_for_completion(&drainer->wakeparent);
+	init_completion(&drainer->wakeparent);
+
+	/* tear down */
+	list_for_each_entry_safe(data, drainer, &threads, node) {
+		complete(&data->wakethread);
+		ret = kthread_stop(data->t);
+		BUG_ON(ret);
+		list_del(&data->node);
+		/* check that we get the expected callbacks (and no others) */
+		BUG_ON(data->num_enter != 1);
+		BUG_ON(data->num_exit != 0);
+		kfree(data);
+	}
+	bman_free_pool(pool_nocb);
+
+	pr_info("bman_test_thresh: done\n");
+}
-- 
2.3.0
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