[PATCH] NTB: ntb_perf: Add full multi-port NTB API support

* [PATCH] NTB: ntb_perf: Add full multi-port NTB API support
@ 2017-08-08 10:16 Serge Semin
  2017-11-30 21:38 ` [PATCH v2] " Serge Semin
  0 siblings, 1 reply; 4+ messages in thread
From: Serge Semin @ 2017-08-08 10:16 UTC (permalink / raw)
  To: jdmason, dave.jiang, Allen.Hubbe, Shyam-sundar.S-k,
	Xiangliang.Yu, gary.hook, logang
  Cc: Sergey.Semin, linux-ntb, linux-kernel, Serge Semin

NTB API has been updated to support multi-port devices like IDT
89HPESx series or Microsemi Switchtec. Message registers
functionality has also been added to new API. In order to keep
the new hardware and corresponding capabilities well tested, NTB
performance driver is accordingly altered.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
---

Changelog v1:
- Create Scratchpads and Message compliant NTB link init process
- Simplify memcpy and DMA-based tests process
- Limit DebugFS access methods to prevent the driver failure

 drivers/ntb/test/ntb_perf.c | 1771 ++++++++++++++++++++++++++++---------------
 1 file changed, 1173 insertions(+), 598 deletions(-)

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 759f772fa00c..c09f27ef9e5b 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -5,6 +5,7 @@
  *   GPL LICENSE SUMMARY
  *
  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2017 T-Platforms. All Rights Reserved.
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of version 2 of the GNU General Public License as
@@ -13,6 +14,7 @@
  *   BSD LICENSE
  *
  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2017 T-Platforms. All Rights Reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
  *   modification, are permitted provided that the following conditions
@@ -40,860 +42,1433 @@
  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *   PCIe NTB Perf Linux driver
+ * NTB Perf Linux driver
+ *
+ * Contact Information:
+ * Dave Jiang <dave.jiang@intel.com>
+ * Serge Semin <fancer.lancer@gmail.com>, <Sergey.Semin@t-platforms.ru>
+ */
+
+/*
+ * How to use this tool, by example.
+ *
+ * Assuming $DBG_DIR is something like:
+ * '/sys/kernel/debug/ntb_perf/0000:00:03.0'
+ * Suppose aside from local device there is at least one remote device
+ * connected to NTB with index 0.
+ *-----------------------------------------------------------------------------
+ * Eg: install driver with specified chunk/total orders and dma-enabled flag
+ *
+ * root@self# insmod ntb_perf.ko chunk_order=19 total_order=28 use_dma
+ *-----------------------------------------------------------------------------
+ * Eg: check NTB ports (index) and MW mapping information
+ *
+ * root@self# cat $DBG_DIR/info
+ *-----------------------------------------------------------------------------
+ * Eg: start performance test with peer (index 0) and get the test metrics
+ *
+ * root@self# echo 0 > $DBG_DIR/run
+ * root@self# cat $DBG_DIR/run
  */
 
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/kthread.h>
-#include <linux/time.h>
-#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
 #include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
 #include <linux/pci.h>
+#include <linux/ktime.h>
 #include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/debugfs.h>
-#include <linux/dmaengine.h>
 #include <linux/delay.h>
 #include <linux/sizes.h>
+#include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/random.h>
 #include <linux/ntb.h>
-#include <linux/mutex.h>
 
 #define DRIVER_NAME		"ntb_perf"
-#define DRIVER_DESCRIPTION	"PCIe NTB Performance Measurement Tool"
+#define DRIVER_DESCRIPTION	"NTB Performance Measurement Tool"
 
 #define DRIVER_LICENSE		"Dual BSD/GPL"
-#define DRIVER_VERSION		"1.0"
+#define DRIVER_VERSION		"2.0"
+#define DRIVER_RELDATE		"1 August 2017"
 #define DRIVER_AUTHOR		"Dave Jiang <dave.jiang@intel.com>"
 
-#define PERF_LINK_DOWN_TIMEOUT	10
-#define PERF_VERSION		0xffff0001
-#define MAX_THREADS		32
-#define MAX_TEST_SIZE		SZ_1M
-#define MAX_SRCS		32
-#define DMA_OUT_RESOURCE_TO	msecs_to_jiffies(50)
-#define DMA_RETRIES		20
-#define SZ_4G			(1ULL << 32)
-#define MAX_SEG_ORDER		20 /* no larger than 1M for kmalloc buffer */
-#define PIDX			NTB_DEF_PEER_IDX
-
 MODULE_LICENSE(DRIVER_LICENSE);
 MODULE_VERSION(DRIVER_VERSION);
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
 
-static struct dentry *perf_debugfs_dir;
+#define MAX_THREADS_CNT		32
+#define DEF_THREADS_CNT		1
+#define MAX_CHUNK_SIZE		SZ_1M
+#define MAX_CHUNK_ORDER		20 /* no larger than 1M */
+
+#define DMA_TRIES		100
+#define DMA_MDELAY		10
+
+#define MSG_TRIES		500
+#define MSG_UDELAY_LOW		1000
+#define MSG_UDELAY_HIGH		2000
 
 static unsigned long max_mw_size;
 module_param(max_mw_size, ulong, 0644);
-MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows");
+MODULE_PARM_DESC(max_mw_size, "Upper limit of memory window size");
 
-static unsigned int seg_order = 19; /* 512K */
-module_param(seg_order, uint, 0644);
-MODULE_PARM_DESC(seg_order, "size order [2^n] of buffer segment for testing");
+static unsigned char chunk_order = 19; /* 512K */
+module_param(chunk_order, byte, 0644);
+MODULE_PARM_DESC(chunk_order, "Data chunk order [2^n] to transfer");
 
-static unsigned int run_order = 32; /* 4G */
-module_param(run_order, uint, 0644);
-MODULE_PARM_DESC(run_order, "size order [2^n] of total data to transfer");
+static unsigned char total_order = 30; /* 1G */
+module_param(total_order, byte, 0644);
+MODULE_PARM_DESC(total_order, "Total data order [2^n] to transfer");
 
 static bool use_dma; /* default to 0 */
 module_param(use_dma, bool, 0644);
-MODULE_PARM_DESC(use_dma, "Using DMA engine to measure performance");
-
-static bool on_node = true; /* default to 1 */
-module_param(on_node, bool, 0644);
-MODULE_PARM_DESC(on_node, "Run threads only on NTB device node (default: true)");
-
-struct perf_mw {
-	phys_addr_t	phys_addr;
-	resource_size_t	phys_size;
-	resource_size_t	xlat_align;
-	resource_size_t	xlat_align_size;
-	void __iomem	*vbase;
-	size_t		xlat_size;
-	size_t		buf_size;
-	void		*virt_addr;
-	dma_addr_t	dma_addr;
+MODULE_PARM_DESC(use_dma, "Use DMA engine to measure performance");
+
+/*==============================================================================
+ *                         Perf driver data definition
+ *==============================================================================
+ */
+
+enum perf_cmd {
+	PERF_CMD_INVAL = -1,/* invalid spad command */
+	PERF_CMD_SSIZE = 0, /* send out buffer size */
+	PERF_CMD_RSIZE = 1, /* recv in  buffer size */
+	PERF_CMD_SXLAT = 2, /* send in  buffer xlat */
+	PERF_CMD_RXLAT = 3, /* recv out buffer xlat */
+	PERF_CMD_CLEAR = 4, /* clear allocated memory */
+	PERF_STS_DONE  = 5, /* init is done */
+	PERF_STS_LNKUP = 6, /* link up state flag */
 };
 
 struct perf_ctx;
 
-struct pthr_ctx {
-	struct task_struct	*thread;
-	struct perf_ctx		*perf;
-	atomic_t		dma_sync;
-	struct dma_chan		*dma_chan;
-	int			dma_prep_err;
-	int			src_idx;
-	void			*srcs[MAX_SRCS];
-	wait_queue_head_t       *wq;
-	int			status;
-	u64			copied;
-	u64			diff_us;
+struct perf_peer {
+	struct perf_ctx	*perf;
+	int pidx;
+	int gidx;
+
+	/* Outbound MW params */
+	u64 outbuf_xlat;
+	resource_size_t outbuf_size;
+	void __iomem *outbuf;
+
+	/* Inbound MW params */
+	resource_size_t xlat_align;
+	resource_size_t size_align;
+	resource_size_t size_max;
+	dma_addr_t inbuf_xlat;
+	resource_size_t inbuf_size;
+	void		*inbuf;
+
+	/* NTB connection setup service */
+	struct work_struct	service;
+	unsigned long		sts;
 };
+#define to_peer_service(__work) \
+	container_of(__work, struct perf_peer, service)
 
-struct perf_ctx {
-	struct ntb_dev		*ntb;
-	spinlock_t		db_lock;
-	struct perf_mw		mw;
-	bool			link_is_up;
-	struct delayed_work	link_work;
-	wait_queue_head_t	link_wq;
-	u8			perf_threads;
-	/* mutex ensures only one set of threads run at once */
-	struct mutex		run_mutex;
-	struct pthr_ctx		pthr_ctx[MAX_THREADS];
-	atomic_t		tsync;
-	atomic_t                tdone;
+struct perf_thread {
+	struct perf_ctx *perf;
+	int tidx;
+
+	/* DMA-based test sync parameters */
+	atomic_t dma_sync;
+	wait_queue_head_t dma_wait;
+	struct dma_chan *dma_chan;
+
+	/* Data source and measured statistics */
+	void *src;
+	u64 copied;
+	ktime_t duration;
+	int status;
+	struct work_struct work;
 };
+#define to_thread_work(__work) \
+	container_of(__work, struct perf_thread, work)
 
-enum {
-	VERSION = 0,
-	MW_SZ_HIGH,
-	MW_SZ_LOW,
-	MAX_SPAD
+struct perf_ctx {
+	struct ntb_dev *ntb;
+
+	/* Global device index and peers descriptors */
+	int gidx;
+	int pcnt;
+	struct perf_peer *peers;
+
+	/* Performance measuring work-threads interface */
+	unsigned long busy_flag;
+	wait_queue_head_t twait;
+	atomic_t tsync;
+	u8 tcnt;
+	struct perf_peer *test_peer;
+	struct perf_thread threads[MAX_THREADS_CNT];
+
+	/* Scratchpad/Message IO operations */
+	int (*cmd_send)(struct perf_peer *peer, enum perf_cmd cmd, u64 data);
+	int (*cmd_recv)(struct perf_ctx *perf, int *pidx, enum perf_cmd *cmd,
+			u64 *data);
+
+	struct dentry *dbgfs_dir;
 };
 
+/*==============================================================================
+ *                           Static data declarations
+ *==============================================================================
+ */
+
+static struct dentry *perf_dbgfs_topdir;
+
+static struct workqueue_struct *perf_wq __read_mostly;
+
+/*==============================================================================
+ *                  NTB cross-link commands execution service
+ *==============================================================================
+ */
+
+static void perf_terminate_test(struct perf_ctx *perf);
+
+static inline bool perf_link_is_up(struct perf_peer *peer)
+{
+	u64 link;
+
+	link = ntb_link_is_up(peer->perf->ntb, NULL, NULL);
+	return !!(link & BIT_ULL_MASK(peer->pidx));
+}
+
+static int perf_spad_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
+			      u64 data)
+{
+	struct perf_ctx *perf = peer->perf;
+	int try, sbase;
+	u32 sts;
+
+	/*
+	 * Perform predefined number of attempts before give up.
+	 * We are sending the data to the port specific scratchpad, so
+	 * to prevent a multi-port access race-condition. Additionally
+	 * there is no need in local locking since only thread-safe
+	 * service work is using this method.
+	 */
+	sbase = 3*peer->gidx;
+	for (try = 0; try < MSG_TRIES; try++) {
+		if (!perf_link_is_up(peer))
+			return -ENOLINK;
+
+		sts = ntb_peer_spad_read(perf->ntb, peer->pidx, sbase);
+		if (le32_to_cpu(sts) != PERF_CMD_INVAL) {
+			usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
+			continue;
+		}
+
+		ntb_peer_spad_write(perf->ntb, peer->pidx, sbase + 1,
+				    cpu_to_le32(lower_32_bits(data)));
+		ntb_peer_spad_write(perf->ntb, peer->pidx, sbase + 2,
+				    cpu_to_le32(upper_32_bits(data)));
+		mmiowb();
+		ntb_peer_spad_write(perf->ntb, peer->pidx, sbase,
+				    cpu_to_le32(cmd));
+		mmiowb();
+		ntb_peer_db_set(perf->ntb, BIT_ULL(peer->gidx));
+
+		break;
+	}
+
+	return try < MSG_TRIES ? 0 : -EAGAIN;
+}
+
+static int perf_spad_cmd_recv(struct perf_ctx *perf, int *pidx,
+			      enum perf_cmd *cmd, u64 *data)
+{
+	struct perf_peer *peer;
+	int sbase;
+	u32 val;
+
+	ntb_db_clear(perf->ntb, BIT_ULL(perf->gidx));
+
+	/*
+	 * We start scanning all over, since cleared DB may have been set
+	 * by any peer. Yes, it makes peer with smaller index being
+	 * serviced with greater priority, but it's convenient for spad
+	 * and message code unification and simplicity.
+	 */
+	for (*pidx = 0; *pidx < perf->pcnt; (*pidx)++) {
+		peer = &perf->peers[*pidx];
+
+		if (!perf_link_is_up(peer))
+			continue;
+
+		sbase = 3*peer->gidx;
+		val = le32_to_cpu(ntb_spad_read(perf->ntb, sbase));
+		if (val == PERF_CMD_INVAL)
+			continue;
+
+		*cmd = val;
+
+		val = le32_to_cpu(ntb_spad_read(perf->ntb, sbase + 1));
+		*data = val;
+
+		val = le32_to_cpu(ntb_spad_read(perf->ntb, sbase + 2));
+		*data |= (u64)val << 32;
+
+		/* Next command can be retrieved from now */
+		ntb_spad_write(perf->ntb, sbase, cpu_to_le32(PERF_CMD_INVAL));
+
+		return 0;
+	}
+
+	return -ENODATA;
+}
+
+static int perf_msg_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
+			     u64 data)
+{
+	struct perf_ctx *perf = peer->perf;
+	int try, ret;
+	u64 outbits;
+
+	/*
+	 * Perform predefined number of attempts before give up. Message
+	 * registers are free of race-condition problem when accessed
+	 * from different ports, so we don't need splitting registers
+	 * by global device index. We also won't have local locking,
+	 * since the method is used from service work only.
+	 */
+	outbits = ntb_msg_outbits(perf->ntb);
+	for (try = 0; try < MSG_TRIES; try++) {
+		if (!perf_link_is_up(peer))
+			return -ENOLINK;
+
+		ret = ntb_msg_clear_sts(perf->ntb, outbits);
+		if (ret)
+			return ret;
+
+		ntb_peer_msg_write(perf->ntb, peer->pidx, 1,
+			      cpu_to_le32(lower_32_bits(data)));
+
+		if (ntb_msg_read_sts(perf->ntb) & outbits) {
+			usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
+			continue;
+		}
+
+		ntb_peer_msg_write(perf->ntb, peer->pidx, 2,
+			      cpu_to_le32(upper_32_bits(data)));
+		mmiowb();
+
+		/* This call shall trigger peer message event */
+		ntb_peer_msg_write(perf->ntb, peer->pidx, 0,
+			      cpu_to_le32(cmd));
+
+		break;
+	}
+
+	return try < MSG_TRIES ? 0 : -EAGAIN;
+}
+
+static int perf_msg_cmd_recv(struct perf_ctx *perf, int *pidx,
+			     enum perf_cmd *cmd, u64 *data)
+{
+	u64 inbits;
+	u32 val;
+
+	inbits = ntb_msg_inbits(perf->ntb);
+
+	if (hweight64(ntb_msg_read_sts(perf->ntb) & inbits) < 3)
+		return -ENODATA;
+
+	val = ntb_msg_read(perf->ntb, pidx, 0);
+	*cmd = le32_to_cpu(val);
+
+	val = ntb_msg_read(perf->ntb, pidx, 1);
+	*data = val;
+
+	val = ntb_msg_read(perf->ntb, pidx, 2);
+	*data |= (u64)val << 32;
+
+	/* Next command can be retrieved from now */
+	ntb_msg_clear_sts(perf->ntb, inbits);
+
+	return 0;
+}
+
+static int perf_cmd_send(struct perf_peer *peer, enum perf_cmd cmd, u64 data)
+{
+	struct perf_ctx *perf = peer->perf;
+
+	if (cmd == PERF_CMD_SSIZE || cmd == PERF_CMD_SXLAT)
+		return perf->cmd_send(peer, cmd, data);
+
+	dev_err(&perf->ntb->dev, "Send invalid command\n");
+	return -EINVAL;
+}
+
+static int perf_cmd_exec(struct perf_peer *peer, enum perf_cmd cmd)
+{
+	switch (cmd) {
+	case PERF_CMD_SSIZE:
+	case PERF_CMD_RSIZE:
+	case PERF_CMD_SXLAT:
+	case PERF_CMD_RXLAT:
+	case PERF_CMD_CLEAR:
+		break;
+	default:
+		dev_err(&peer->perf->ntb->dev, "Exec invalid command\n");
+		return -EINVAL;
+	}
+
+	/* No need of memory barrier, since bit ops have invernal lock */
+	set_bit(cmd, &peer->sts);
+
+	(void)queue_work(system_highpri_wq, &peer->service);
+
+	return 0;
+}
+
+static int perf_cmd_recv(struct perf_ctx *perf)
+{
+	struct perf_peer *peer;
+	int ret, pidx, cmd;
+	u64 data;
+
+	while (!(ret = perf->cmd_recv(perf, &pidx, &cmd, &data))) {
+		peer = &perf->peers[pidx];
+
+		switch (cmd) {
+		case PERF_CMD_SSIZE:
+			peer->inbuf_size = data;
+			return perf_cmd_exec(peer, PERF_CMD_RSIZE);
+		case PERF_CMD_SXLAT:
+			peer->outbuf_xlat = data;
+			return perf_cmd_exec(peer, PERF_CMD_RXLAT);
+		default:
+			dev_err(&perf->ntb->dev, "Recv invalid command\n");
+			return -EINVAL;
+		}
+	}
+
+	return ret == -ENODATA ? 0 : ret;
+}
+
 static void perf_link_event(void *ctx)
 {
 	struct perf_ctx *perf = ctx;
+	struct perf_peer *peer;
+	bool lnk_up;
+	int pidx;
 
-	if (ntb_link_is_up(perf->ntb, NULL, NULL) == 1) {
-		schedule_delayed_work(&perf->link_work, 2*HZ);
-	} else {
-		dev_dbg(&perf->ntb->pdev->dev, "link down\n");
+	for (pidx = 0; pidx < perf->pcnt; pidx++) {
+		peer = &perf->peers[pidx];
 
-		if (!perf->link_is_up)
-			cancel_delayed_work_sync(&perf->link_work);
+		lnk_up = perf_link_is_up(peer);
 
-		perf->link_is_up = false;
+		if (lnk_up &&
+		    !test_and_set_bit(PERF_STS_LNKUP, &peer->sts)) {
+			perf_cmd_exec(peer, PERF_CMD_SSIZE);
+		} else if (!lnk_up &&
+			   test_and_clear_bit(PERF_STS_LNKUP, &peer->sts)) {
+			perf_cmd_exec(peer, PERF_CMD_CLEAR);
+		}
 	}
 }
 
 static void perf_db_event(void *ctx, int vec)
 {
 	struct perf_ctx *perf = ctx;
-	u64 db_bits, db_mask;
 
-	db_mask = ntb_db_vector_mask(perf->ntb, vec);
-	db_bits = ntb_db_read(perf->ntb);
+	dev_dbg(&perf->ntb->dev, "DB vec %d mask %#llx bits %#llx\n", vec,
+		ntb_db_vector_mask(perf->ntb, vec), ntb_db_read(perf->ntb));
+
+	/* Just receive all available commands */
+	(void)perf_cmd_recv(perf);
+}
+
+static void perf_msg_event(void *ctx)
+{
+	struct perf_ctx *perf = ctx;
+
+	dev_dbg(&perf->ntb->dev, "Msg status bits %#llx\n",
+		ntb_msg_read_sts(perf->ntb));
 
-	dev_dbg(&perf->ntb->dev, "doorbell vec %d mask %#llx bits %#llx\n",
-		vec, db_mask, db_bits);
+	/* Messages are only sent one-by-one */
+	(void)perf_cmd_recv(perf);
 }
 
 static const struct ntb_ctx_ops perf_ops = {
 	.link_event = perf_link_event,
 	.db_event = perf_db_event,
+	.msg_event = perf_msg_event
 };
 
-static void perf_copy_callback(void *data)
+static void perf_free_outbuf(struct perf_peer *peer)
 {
-	struct pthr_ctx *pctx = data;
+	(void)ntb_peer_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
+}
+
+static int perf_setup_outbuf(struct perf_peer *peer)
+{
+	struct perf_ctx *perf = peer->perf;
+	int ret;
+
+	/* Outbuf size can be unaligned due to custom max_mw_size */
+	ret = ntb_peer_mw_set_trans(perf->ntb, peer->pidx, peer->gidx,
+				    peer->outbuf_xlat, peer->outbuf_size);
+	if (ret) {
+		dev_err(&perf->ntb->dev, "Failed to set outbuf translation\n");
+		return ret;
+	}
+
+	/* Initialization is finally done */
+	set_bit(PERF_STS_DONE, &peer->sts);
 
-	atomic_dec(&pctx->dma_sync);
+	return 0;
 }
 
-static ssize_t perf_copy(struct pthr_ctx *pctx, char __iomem *dst,
-			 char *src, size_t size)
+static void perf_free_inbuf(struct perf_peer *peer)
 {
-	struct perf_ctx *perf = pctx->perf;
-	struct dma_async_tx_descriptor *txd;
-	struct dma_chan *chan = pctx->dma_chan;
-	struct dma_device *device;
-	struct dmaengine_unmap_data *unmap;
-	dma_cookie_t cookie;
-	size_t src_off, dst_off;
-	struct perf_mw *mw = &perf->mw;
-	void __iomem *vbase;
-	void __iomem *dst_vaddr;
-	dma_addr_t dst_phys;
-	int retries = 0;
+	if (!peer->inbuf)
+		return;
 
-	if (!use_dma) {
-		memcpy_toio(dst, src, size);
-		return size;
-	}
+	(void)ntb_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
+	dma_free_coherent(&peer->perf->ntb->dev, peer->inbuf_size,
+			  peer->inbuf, peer->inbuf_xlat);
+	peer->inbuf = NULL;
+}
 
-	if (!chan) {
-		dev_err(&perf->ntb->dev, "DMA engine does not exist\n");
+static int perf_setup_inbuf(struct perf_peer *peer)
+{
+	struct perf_ctx *perf = peer->perf;
+	int ret;
+
+	if (peer->inbuf_size > peer->size_max) {
+		dev_err(&perf->ntb->dev, "Too big inbuf size %pa\n",
+			&peer->inbuf_size);
 		return -EINVAL;
 	}
 
-	device = chan->device;
-	src_off = (uintptr_t)src & ~PAGE_MASK;
-	dst_off = (uintptr_t __force)dst & ~PAGE_MASK;
-
-	if (!is_dma_copy_aligned(device, src_off, dst_off, size))
-		return -ENODEV;
+	peer->inbuf_size = round_up(peer->inbuf_size, peer->size_align);
 
-	vbase = mw->vbase;
-	dst_vaddr = dst;
-	dst_phys = mw->phys_addr + (dst_vaddr - vbase);
+	perf_free_inbuf(peer);
 
-	unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT);
-	if (!unmap)
+	peer->inbuf = dma_alloc_coherent(&perf->ntb->dev, peer->inbuf_size,
+					 &peer->inbuf_xlat, GFP_KERNEL);
+	if (!peer->inbuf) {
+		dev_err(&perf->ntb->dev, "Failed to alloc inbuf of %pa\n",
+			&peer->inbuf_size);
 		return -ENOMEM;
+	}
+	if (!IS_ALIGNED(peer->inbuf_xlat, peer->xlat_align)) {
+		dev_err(&perf->ntb->dev, "Unaligned xlat allocated\n");
+		goto err_free_inbuf;
+	}
 
-	unmap->len = size;
-	unmap->addr[0] = dma_map_page(device->dev, virt_to_page(src),
-				      src_off, size, DMA_TO_DEVICE);
-	if (dma_mapping_error(device->dev, unmap->addr[0]))
-		goto err_get_unmap;
+	ret = ntb_mw_set_trans(perf->ntb, peer->pidx, peer->gidx,
+			       peer->inbuf_xlat, peer->inbuf_size);
+	if (ret) {
+		dev_err(&perf->ntb->dev, "Failed to set inbuf translation\n");
+		goto err_free_inbuf;
+	}
 
-	unmap->to_cnt = 1;
+	/*
+	 * We submit inbuf xlat transmission cmd for execution here to follow
+	 * the code architecture, even though this method is called from service
+	 * work itself so the command will be executed right after it returns.
+	 */
+	(void)perf_cmd_exec(peer, PERF_CMD_SXLAT);
 
-	do {
-		txd = device->device_prep_dma_memcpy(chan, dst_phys,
-						     unmap->addr[0],
-						     size, DMA_PREP_INTERRUPT);
-		if (!txd) {
-			set_current_state(TASK_INTERRUPTIBLE);
-			schedule_timeout(DMA_OUT_RESOURCE_TO);
-		}
-	} while (!txd && (++retries < DMA_RETRIES));
+	return 0;
 
-	if (!txd) {
-		pctx->dma_prep_err++;
-		goto err_get_unmap;
-	}
+err_free_inbuf:
+	perf_free_inbuf(peer);
 
-	txd->callback = perf_copy_callback;
-	txd->callback_param = pctx;
-	dma_set_unmap(txd, unmap);
+	return ret;
+}
 
-	cookie = dmaengine_submit(txd);
-	if (dma_submit_error(cookie))
-		goto err_set_unmap;
+static void perf_service_work(struct work_struct *work)
+{
+	struct perf_peer *peer = to_peer_service(work);
 
-	dmaengine_unmap_put(unmap);
+	if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts))
+		perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size);
 
-	atomic_inc(&pctx->dma_sync);
-	dma_async_issue_pending(chan);
+	if (test_and_clear_bit(PERF_CMD_RSIZE, &peer->sts))
+		perf_setup_inbuf(peer);
 
-	return size;
+	if (test_and_clear_bit(PERF_CMD_SXLAT, &peer->sts))
+		perf_cmd_send(peer, PERF_CMD_SXLAT, peer->inbuf_xlat);
 
-err_set_unmap:
-	dmaengine_unmap_put(unmap);
-err_get_unmap:
-	dmaengine_unmap_put(unmap);
-	return 0;
-}
+	if (test_and_clear_bit(PERF_CMD_RXLAT, &peer->sts))
+		perf_setup_outbuf(peer);
 
-static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src,
-			  u64 buf_size, u64 win_size, u64 total)
-{
-	int chunks, total_chunks, i;
-	int copied_chunks = 0;
-	u64 copied = 0, result;
-	char __iomem *tmp = dst;
-	u64 perf, diff_us;
-	ktime_t kstart, kstop, kdiff;
-	unsigned long last_sleep = jiffies;
-
-	chunks = div64_u64(win_size, buf_size);
-	total_chunks = div64_u64(total, buf_size);
-	kstart = ktime_get();
-
-	for (i = 0; i < total_chunks; i++) {
-		result = perf_copy(pctx, tmp, src, buf_size);
-		copied += result;
-		copied_chunks++;
-		if (copied_chunks == chunks) {
-			tmp = dst;
-			copied_chunks = 0;
-		} else
-			tmp += buf_size;
-
-		/* Probably should schedule every 5s to prevent soft hang. */
-		if (unlikely((jiffies - last_sleep) > 5 * HZ)) {
-			last_sleep = jiffies;
-			set_current_state(TASK_INTERRUPTIBLE);
-			schedule_timeout(1);
+	if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) {
+		clear_bit(PERF_STS_DONE, &peer->sts);
+		if (test_bit(0, &peer->perf->busy_flag) &&
+		    peer == peer->perf->test_peer) {
+			dev_warn(&peer->perf->ntb->dev,
+				"Freeing while test on-fly\n");
+			perf_terminate_test(peer->perf);
 		}
+		perf_free_outbuf(peer);
+		perf_free_inbuf(peer);
+	}
+}
+
+static int perf_init_service(struct perf_ctx *perf)
+{
+	u64 mask;
 
-		if (unlikely(kthread_should_stop()))
-			break;
+	if (ntb_peer_mw_count(perf->ntb) < perf->pcnt + 1) {
+		dev_err(&perf->ntb->dev, "Not enough memory windows\n");
+		return -EINVAL;
 	}
 
-	if (use_dma) {
-		pr_debug("%s: All DMA descriptors submitted\n", current->comm);
-		while (atomic_read(&pctx->dma_sync) != 0) {
-			if (kthread_should_stop())
-				break;
-			msleep(20);
-		}
+	if (ntb_msg_count(perf->ntb) >= 3) {
+		perf->cmd_send = perf_msg_cmd_send;
+		perf->cmd_recv = perf_msg_cmd_recv;
+
+		dev_dbg(&perf->ntb->dev, "Message service initialized\n");
+
+		return 0;
 	}
 
-	kstop = ktime_get();
-	kdiff = ktime_sub(kstop, kstart);
-	diff_us = ktime_to_us(kdiff);
+	dev_dbg(&perf->ntb->dev, "Message service unsupported\n");
 
-	pr_debug("%s: copied %llu bytes\n", current->comm, copied);
+	mask = GENMASK_ULL(perf->pcnt - 1, 0);
+	if (ntb_spad_count(perf->ntb) >= 3*(perf->pcnt + 1) &&
+	    (ntb_db_valid_mask(perf->ntb) & mask) == mask) {
+		perf->cmd_send = perf_spad_cmd_send;
+		perf->cmd_recv = perf_spad_cmd_recv;
 
-	pr_debug("%s: lasted %llu usecs\n", current->comm, diff_us);
+		dev_dbg(&perf->ntb->dev, "Scratchpad service initialized\n");
 
-	perf = div64_u64(copied, diff_us);
+		return 0;
+	}
 
-	pr_debug("%s: MBytes/s: %llu\n", current->comm, perf);
+	dev_dbg(&perf->ntb->dev, "Scratchpad service unsupported\n");
 
-	pctx->copied = copied;
-	pctx->diff_us = diff_us;
+	dev_err(&perf->ntb->dev, "Command services unsupported\n");
 
-	return 0;
+	return -EINVAL;
 }
 
-static bool perf_dma_filter_fn(struct dma_chan *chan, void *node)
+static int perf_enable_service(struct perf_ctx *perf)
 {
-	/* Is the channel required to be on the same node as the device? */
-	if (!on_node)
-		return true;
+	u64 mask, incmd_bit;
+	int ret;
+
+	mask = ntb_db_valid_mask(perf->ntb);
+	(void)ntb_db_set_mask(perf->ntb, mask);
+
+	ret = ntb_set_ctx(perf->ntb, perf, &perf_ops);
+	if (ret)
+		return ret;
+
+	if (perf->cmd_send == perf_msg_cmd_send) {
+		u64 inbits, outbits;
+
+		inbits = ntb_msg_inbits(perf->ntb);
+		outbits = ntb_msg_outbits(perf->ntb);
+		(void)ntb_msg_set_mask(perf->ntb, inbits | outbits);
 
-	return dev_to_node(&chan->dev->device) == (int)(unsigned long)node;
+		incmd_bit = BIT_ULL(__ffs64(inbits));
+		ret = ntb_msg_clear_mask(perf->ntb, incmd_bit);
+	} else {
+		incmd_bit = BIT_ULL(perf->gidx);
+		ret = ntb_db_clear_mask(perf->ntb, incmd_bit);
+	}
+	if (ret) {
+		ntb_clear_ctx(perf->ntb);
+		return ret;
+	}
+
+	ntb_link_enable(perf->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
+	/* Might be not necessary */
+	ntb_link_event(perf->ntb);
+
+	return 0;
 }
 
-static int ntb_perf_thread(void *data)
+static void perf_disable_service(struct perf_ctx *perf)
 {
-	struct pthr_ctx *pctx = data;
-	struct perf_ctx *perf = pctx->perf;
-	struct pci_dev *pdev = perf->ntb->pdev;
-	struct perf_mw *mw = &perf->mw;
-	char __iomem *dst;
-	u64 win_size, buf_size, total;
-	void *src;
-	int rc, node, i;
-	struct dma_chan *dma_chan = NULL;
-
-	pr_debug("kthread %s starting...\n", current->comm);
+	int pidx;
 
-	node = on_node ? dev_to_node(&pdev->dev) : NUMA_NO_NODE;
+	ntb_link_disable(perf->ntb);
 
-	if (use_dma && !pctx->dma_chan) {
-		dma_cap_mask_t dma_mask;
+	if (perf->cmd_send == perf_msg_cmd_send) {
+		u64 inbits;
 
-		dma_cap_zero(dma_mask);
-		dma_cap_set(DMA_MEMCPY, dma_mask);
-		dma_chan = dma_request_channel(dma_mask, perf_dma_filter_fn,
-					       (void *)(unsigned long)node);
-		if (!dma_chan) {
-			pr_warn("%s: cannot acquire DMA channel, quitting\n",
-				current->comm);
-			return -ENODEV;
-		}
-		pctx->dma_chan = dma_chan;
+		inbits = ntb_msg_inbits(perf->ntb);
+		(void)ntb_msg_set_mask(perf->ntb, inbits);
+	} else {
+		(void)ntb_db_set_mask(perf->ntb, BIT_ULL(perf->gidx));
 	}
 
-	for (i = 0; i < MAX_SRCS; i++) {
-		pctx->srcs[i] = kmalloc_node(MAX_TEST_SIZE, GFP_KERNEL, node);
-		if (!pctx->srcs[i]) {
-			rc = -ENOMEM;
-			goto err;
-		}
-	}
+	ntb_clear_ctx(perf->ntb);
+
+	for (pidx = 0; pidx < perf->pcnt; pidx++)
+		perf_cmd_exec(&perf->peers[pidx], PERF_CMD_CLEAR);
 
-	win_size = mw->phys_size;
-	buf_size = 1ULL << seg_order;
-	total = 1ULL << run_order;
+	for (pidx = 0; pidx < perf->pcnt; pidx++)
+		flush_work(&perf->peers[pidx].service);
+}
 
-	if (buf_size > MAX_TEST_SIZE)
-		buf_size = MAX_TEST_SIZE;
+/*==============================================================================
+ *                      Performance measuring work-thread
+ *==============================================================================
+ */
 
-	dst = (char __iomem *)mw->vbase;
+static void perf_dma_copy_callback(void *data)
+{
+	struct perf_thread *pthr = data;
 
-	atomic_inc(&perf->tsync);
-	while (atomic_read(&perf->tsync) != perf->perf_threads)
-		schedule();
+	atomic_dec(&pthr->dma_sync);
+	wake_up(&pthr->dma_wait);
+}
 
-	src = pctx->srcs[pctx->src_idx];
-	pctx->src_idx = (pctx->src_idx + 1) & (MAX_SRCS - 1);
+static int perf_copy_chunk(struct perf_thread *pthr,
+			   void __iomem *dst, void *src, size_t len)
+{
+	struct dma_async_tx_descriptor *tx;
+	struct dmaengine_unmap_data *unmap;
+	struct device *dma_dev;
+	int try, ret = 0;
 
-	rc = perf_move_data(pctx, dst, src, buf_size, win_size, total);
+	if (!use_dma) {
+		memcpy_toio(dst, src, len);
+		goto ret_check_tsync;
+	}
 
-	atomic_dec(&perf->tsync);
+	dma_dev = pthr->dma_chan->device->dev;
 
-	if (rc < 0) {
-		pr_err("%s: failed\n", current->comm);
-		rc = -ENXIO;
-		goto err;
+	if (!is_dma_copy_aligned(pthr->dma_chan->device, offset_in_page(src),
+				 offset_in_page(dst), len))
+		return -EIO;
+
+	unmap = dmaengine_get_unmap_data(dma_dev, 2, GFP_NOWAIT);
+	if (!unmap)
+		return -ENOMEM;
+
+	unmap->len = len;
+	unmap->addr[0] = dma_map_page(dma_dev, virt_to_page(src),
+		offset_in_page(src), len, DMA_TO_DEVICE);
+	if (dma_mapping_error(dma_dev, unmap->addr[0])) {
+		ret = -EIO;
+		goto err_free_resource;
+	}
+	unmap->to_cnt = 1;
+
+	unmap->addr[1] = dma_map_page(dma_dev, virt_to_page(dst),
+		offset_in_page(dst), len, DMA_FROM_DEVICE);
+	if (dma_mapping_error(dma_dev, unmap->addr[1])) {
+		ret = -EIO;
+		goto err_free_resource;
 	}
+	unmap->from_cnt = 1;
 
-	for (i = 0; i < MAX_SRCS; i++) {
-		kfree(pctx->srcs[i]);
-		pctx->srcs[i] = NULL;
+	do {
+		tx = dmaengine_prep_dma_memcpy(pthr->dma_chan, unmap->addr[1],
+			unmap->addr[0], len, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+		if (!tx)
+			msleep(DMA_MDELAY);
+	} while (!tx && (try++ < DMA_TRIES));
+
+	if (!tx) {
+		ret = -EIO;
+		goto err_free_resource;
 	}
 
-	atomic_inc(&perf->tdone);
-	wake_up(pctx->wq);
-	rc = 0;
-	goto done;
+	tx->callback = perf_dma_copy_callback;
+	tx->callback_param = pthr;
+	dma_set_unmap(tx, unmap);
 
-err:
-	for (i = 0; i < MAX_SRCS; i++) {
-		kfree(pctx->srcs[i]);
-		pctx->srcs[i] = NULL;
+	if (dma_submit_error(dmaengine_submit(tx))) {
+		dmaengine_unmap_put(unmap);
+		goto err_free_resource;
 	}
 
-	if (dma_chan) {
-		dma_release_channel(dma_chan);
-		pctx->dma_chan = NULL;
+	dmaengine_unmap_put(unmap);
+
+	atomic_inc(&pthr->dma_sync);
+	dma_async_issue_pending(pthr->dma_chan);
+
+ret_check_tsync:
+	return likely(atomic_read(&pthr->perf->tsync) > 0) ? 0 : -EINTR;
+
+err_free_resource:
+	dmaengine_unmap_put(unmap);
+
+	return ret;
+}
+
+static bool perf_dma_filter(struct dma_chan *chan, void *data)
+{
+	struct perf_ctx *perf = data;
+	int node;
+
+	node = dev_to_node(&perf->ntb->dev);
+
+	return node == NUMA_NO_NODE || node == dev_to_node(chan->device->dev);
+}
+
+static int perf_init_test(struct perf_thread *pthr)
+{
+	struct perf_ctx *perf = pthr->perf;
+	dma_cap_mask_t dma_mask;
+
+	pthr->src = kmalloc_node(perf->test_peer->outbuf_size, GFP_KERNEL,
+				 dev_to_node(&perf->ntb->dev));
+	if (!pthr->src)
+		return -ENOMEM;
+
+	get_random_bytes(pthr->src, perf->test_peer->outbuf_size);
+
+	if (!use_dma)
+		return 0;
+
+	dma_cap_zero(dma_mask);
+	dma_cap_set(DMA_MEMCPY, dma_mask);
+	pthr->dma_chan = dma_request_channel(dma_mask, perf_dma_filter, perf);
+	if (!pthr->dma_chan) {
+		dev_err(&perf->ntb->dev, "%d: Failed to get DMA channel\n",
+			pthr->tidx);
+		atomic_dec(&perf->tsync);
+		wake_up(&perf->twait);
+		kfree(pthr->src);
+		return -ENODEV;
 	}
 
-done:
-	/* Wait until we are told to stop */
-	for (;;) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (kthread_should_stop())
-			break;
+	atomic_set(&pthr->dma_sync, 0);
+
+	return 0;
+}
+
+static int perf_run_test(struct perf_thread *pthr)
+{
+	struct perf_peer *peer = pthr->perf->test_peer;
+	struct perf_ctx *perf = pthr->perf;
+	void __iomem *flt_dst, *bnd_dst;
+	u64 total_size, chunk_size;
+	void *flt_src;
+	int ret = 0;
+
+	total_size = 1ULL << total_order;
+	chunk_size = 1ULL << chunk_order;
+	chunk_size = min_t(u64, peer->outbuf_size, chunk_size);
+
+	flt_src = pthr->src;
+	bnd_dst = peer->outbuf + peer->outbuf_size;
+	flt_dst = peer->outbuf;
+
+	pthr->duration = ktime_get();
+
+	/* Copied field is cleared on test launch stage */
+	while (pthr->copied < total_size) {
+		ret = perf_copy_chunk(pthr, flt_dst, flt_src, chunk_size);
+		if (ret) {
+			dev_err(&perf->ntb->dev, "%d: Got error %d on test\n",
+				pthr->tidx, ret);
+			return ret;
+		}
+
+		pthr->copied += chunk_size;
+
+		flt_dst += chunk_size;
+		flt_src += chunk_size;
+		if (flt_dst >= bnd_dst || flt_dst < peer->outbuf) {
+			flt_dst = peer->outbuf;
+			flt_src = pthr->src;
+		}
+
+		/* Give up CPU to give a chance for other threads to use it */
 		schedule();
 	}
-	__set_current_state(TASK_RUNNING);
 
-	return rc;
+	return 0;
 }
 
-static void perf_free_mw(struct perf_ctx *perf)
+static int perf_sync_test(struct perf_thread *pthr)
 {
-	struct perf_mw *mw = &perf->mw;
-	struct pci_dev *pdev = perf->ntb->pdev;
+	struct perf_ctx *perf = pthr->perf;
 
-	if (!mw->virt_addr)
-		return;
+	if (!use_dma)
+		goto no_dma_ret;
+
+	wait_event(pthr->dma_wait,
+		   (atomic_read(&pthr->dma_sync) == 0 ||
+		    atomic_read(&perf->tsync) < 0));
+
+	if (atomic_read(&perf->tsync) < 0)
+		return -EINTR;
+
+no_dma_ret:
+	pthr->duration = ktime_sub(ktime_get(), pthr->duration);
+
+	dev_dbg(&perf->ntb->dev, "%d: copied %llu bytes\n",
+		pthr->tidx, pthr->copied);
 
-	ntb_mw_clear_trans(perf->ntb, PIDX, 0);
-	dma_free_coherent(&pdev->dev, mw->buf_size,
-			  mw->virt_addr, mw->dma_addr);
-	mw->xlat_size = 0;
-	mw->buf_size = 0;
-	mw->virt_addr = NULL;
+	dev_dbg(&perf->ntb->dev, "%d: lasted %llu usecs\n",
+		pthr->tidx, ktime_to_us(pthr->duration));
+
+	dev_dbg(&perf->ntb->dev, "%d: %llu MBytes/s\n", pthr->tidx,
+		div64_u64(pthr->copied, ktime_to_us(pthr->duration)));
+
+	return 0;
 }
 
-static int perf_set_mw(struct perf_ctx *perf, resource_size_t size)
+static void perf_clear_test(struct perf_thread *pthr)
 {
-	struct perf_mw *mw = &perf->mw;
-	size_t xlat_size, buf_size;
-	int rc;
+	struct perf_ctx *perf = pthr->perf;
 
-	if (!size)
-		return -EINVAL;
-
-	xlat_size = round_up(size, mw->xlat_align_size);
-	buf_size = round_up(size, mw->xlat_align);
+	if (!use_dma)
+		goto no_dma_notify;
 
-	if (mw->xlat_size == xlat_size)
-		return 0;
+	/*
+	 * If test finished without errors, termination isn't needed.
+	 * We call it anyway just to be sure of the transfers completion.
+	 */
+	(void)dmaengine_terminate_sync(pthr->dma_chan);
 
-	if (mw->buf_size)
-		perf_free_mw(perf);
+	dma_release_channel(pthr->dma_chan);
 
-	mw->xlat_size = xlat_size;
-	mw->buf_size = buf_size;
+no_dma_notify:
+	atomic_dec(&perf->tsync);
+	wake_up(&perf->twait);
+	kfree(pthr->src);
+}
 
-	mw->virt_addr = dma_alloc_coherent(&perf->ntb->pdev->dev, buf_size,
-					   &mw->dma_addr, GFP_KERNEL);
-	if (!mw->virt_addr) {
-		mw->xlat_size = 0;
-		mw->buf_size = 0;
+static void perf_thread_work(struct work_struct *work)
+{
+	struct perf_thread *pthr = to_thread_work(work);
+	int ret;
+
+	/*
+	 * Perform stages in compliance with use_dma flag value.
+	 * Test status is changed only if error happened, otherwise
+	 * status -ENODATA is kept while test is on-fly. Results
+	 * synchronization is performed only if test fininshed
+	 * without an error or interruption.
+	 */
+	ret = perf_init_test(pthr);
+	if (ret) {
+		pthr->status = ret;
+		return;
 	}
 
-	rc = ntb_mw_set_trans(perf->ntb, PIDX, 0, mw->dma_addr, mw->xlat_size);
-	if (rc) {
-		dev_err(&perf->ntb->dev, "Unable to set mw0 translation\n");
-		perf_free_mw(perf);
-		return -EIO;
+	ret = perf_run_test(pthr);
+	if (ret) {
+		pthr->status = ret;
+		goto err_clear_test;
 	}
 
-	return 0;
+	pthr->status = perf_sync_test(pthr);
+
+err_clear_test:
+	perf_clear_test(pthr);
 }
 
-static void perf_link_work(struct work_struct *work)
+static int perf_set_tcnt(struct perf_ctx *perf, u8 tcnt)
 {
-	struct perf_ctx *perf =
-		container_of(work, struct perf_ctx, link_work.work);
-	struct ntb_dev *ndev = perf->ntb;
-	struct pci_dev *pdev = ndev->pdev;
-	u32 val;
-	u64 size;
-	int rc;
+	if (tcnt == 0 || tcnt > MAX_THREADS_CNT)
+		return -EINVAL;
 
-	dev_dbg(&perf->ntb->pdev->dev, "%s called\n", __func__);
+	if (test_and_set_bit_lock(0, &perf->busy_flag))
+		return -EBUSY;
 
-	size = perf->mw.phys_size;
+	perf->tcnt = tcnt;
 
-	if (max_mw_size && size > max_mw_size)
-		size = max_mw_size;
+	clear_bit_unlock(0, &perf->busy_flag);
 
-	ntb_peer_spad_write(ndev, PIDX, MW_SZ_HIGH, upper_32_bits(size));
-	ntb_peer_spad_write(ndev, PIDX, MW_SZ_LOW, lower_32_bits(size));
-	ntb_peer_spad_write(ndev, PIDX, VERSION, PERF_VERSION);
+	return 0;
+}
 
-	/* now read what peer wrote */
-	val = ntb_spad_read(ndev, VERSION);
-	if (val != PERF_VERSION) {
-		dev_dbg(&pdev->dev, "Remote version = %#x\n", val);
-		goto out;
+static void perf_terminate_test(struct perf_ctx *perf)
+{
+	int tidx;
+
+	atomic_set(&perf->tsync, -1);
+	wake_up(&perf->twait);
+
+	for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
+		wake_up(&perf->threads[tidx].dma_wait);
+		cancel_work_sync(&perf->threads[tidx].work);
 	}
+}
 
-	val = ntb_spad_read(ndev, MW_SZ_HIGH);
-	size = (u64)val << 32;
+static int perf_submit_test(struct perf_peer *peer)
+{
+	struct perf_ctx *perf = peer->perf;
+	struct perf_thread *pthr;
+	int tidx, ret;
 
-	val = ntb_spad_read(ndev, MW_SZ_LOW);
-	size |= val;
+	if (!test_bit(PERF_STS_DONE, &peer->sts))
+		return -ENOLINK;
 
-	dev_dbg(&pdev->dev, "Remote MW size = %#llx\n", size);
+	if (test_and_set_bit_lock(0, &perf->busy_flag))
+		return -EBUSY;
 
-	rc = perf_set_mw(perf, size);
-	if (rc)
-		goto out1;
+	perf->test_peer = peer;
+	atomic_set(&perf->tsync, perf->tcnt);
 
-	perf->link_is_up = true;
-	wake_up(&perf->link_wq);
+	for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
+		pthr = &perf->threads[tidx];
 
-	return;
+		pthr->status = -ENODATA;
+		pthr->copied = 0;
+		pthr->duration = ktime_set(0, 0);
+		if (tidx < perf->tcnt)
+			(void)queue_work(perf_wq, &pthr->work);
+	}
+
+	ret = wait_event_interruptible(perf->twait,
+				       atomic_read(&perf->tsync) <= 0);
+	if (ret == -ERESTARTSYS) {
+		perf_terminate_test(perf);
+		ret = -EINTR;
+	}
 
-out1:
-	perf_free_mw(perf);
+	clear_bit_unlock(0, &perf->busy_flag);
 
-out:
-	if (ntb_link_is_up(ndev, NULL, NULL) == 1)
-		schedule_delayed_work(&perf->link_work,
-				      msecs_to_jiffies(PERF_LINK_DOWN_TIMEOUT));
+	return ret;
 }
 
-static int perf_setup_mw(struct ntb_dev *ntb, struct perf_ctx *perf)
+static int perf_read_stats(struct perf_ctx *perf, char *buf,
+			   size_t size, ssize_t *pos)
 {
-	struct perf_mw *mw;
-	int rc;
+	struct perf_thread *pthr;
+	int tidx;
 
-	mw = &perf->mw;
+	if (test_and_set_bit_lock(0, &perf->busy_flag))
+		return -EBUSY;
 
-	rc = ntb_mw_get_align(ntb, PIDX, 0, &mw->xlat_align,
-			      &mw->xlat_align_size, NULL);
-	if (rc)
-		return rc;
+	(*pos) += scnprintf(buf + *pos, size - *pos,
+		"    Peer %d test statistics:\n", perf->test_peer->pidx);
 
-	rc = ntb_peer_mw_get_addr(ntb, 0, &mw->phys_addr, &mw->phys_size);
-	if (rc)
-		return rc;
+	for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
+		pthr = &perf->threads[tidx];
 
-	perf->mw.vbase = ioremap_wc(mw->phys_addr, mw->phys_size);
-	if (!mw->vbase)
-		return -ENOMEM;
+		if (pthr->status == -ENODATA)
+			continue;
+
+		if (pthr->status) {
+			(*pos) += scnprintf(buf + *pos, size - *pos,
+				"%d: error status %d\n", tidx, pthr->status);
+			continue;
+		}
+
+		(*pos) += scnprintf(buf + *pos, size - *pos,
+			"%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n",
+			tidx, pthr->copied, ktime_to_us(pthr->duration),
+			div64_u64(pthr->copied, ktime_to_us(pthr->duration)));
+	}
+
+	clear_bit_unlock(0, &perf->busy_flag);
 
 	return 0;
 }
 
-static ssize_t debugfs_run_read(struct file *filp, char __user *ubuf,
-				size_t count, loff_t *offp)
+static void perf_init_threads(struct perf_ctx *perf)
+{
+	struct perf_thread *pthr;
+	int tidx;
+
+	perf->tcnt = DEF_THREADS_CNT;
+	perf->test_peer = &perf->peers[0];
+	init_waitqueue_head(&perf->twait);
+
+	for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
+		pthr = &perf->threads[tidx];
+
+		pthr->perf = perf;
+		pthr->tidx = tidx;
+		pthr->status = -ENODATA;
+		init_waitqueue_head(&pthr->dma_wait);
+		INIT_WORK(&pthr->work, perf_thread_work);
+	}
+}
+
+static void perf_clear_threads(struct perf_ctx *perf)
+{
+	perf_terminate_test(perf);
+}
+
+/*==============================================================================
+ *                               DebugFS nodes
+ *==============================================================================
+ */
+
+static ssize_t perf_dbgfs_read_info(struct file *filep, char __user *ubuf,
+				    size_t size, loff_t *offp)
 {
-	struct perf_ctx *perf = filp->private_data;
+	struct perf_ctx *perf = filep->private_data;
+	struct perf_peer *peer;
+	size_t buf_size;
+	ssize_t pos = 0;
+	int ret, pidx;
 	char *buf;
-	ssize_t ret, out_off = 0;
-	struct pthr_ctx *pctx;
-	int i;
-	u64 rate;
 
-	if (!perf)
-		return 0;
+	buf_size = min_t(size_t, size, 0x1000U);
 
-	buf = kmalloc(1024, GFP_KERNEL);
+	buf = kmalloc(buf_size, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
-	if (mutex_is_locked(&perf->run_mutex)) {
-		out_off = scnprintf(buf, 64, "running\n");
-		goto read_from_buf;
+	pos += scnprintf(buf + pos, buf_size - pos,
+		"    Performance measuring tool info:\n\n");
+
+	pos += scnprintf(buf + pos, buf_size - pos,
+		"Local port %d, Global index %d\n", ntb_port_number(perf->ntb),
+		perf->gidx);
+	pos += scnprintf(buf + pos, buf_size - pos, "Test status: ");
+	if (test_bit(0, &perf->busy_flag)) {
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"on-fly with port %d (%d)\n",
+			ntb_peer_port_number(perf->ntb, perf->test_peer->pidx),
+			perf->test_peer->pidx);
+	} else {
+		pos += scnprintf(buf + pos, buf_size - pos, "idle\n");
 	}
 
-	for (i = 0; i < MAX_THREADS; i++) {
-		pctx = &perf->pthr_ctx[i];
+	for (pidx = 0; pidx < perf->pcnt; pidx++) {
+		peer = &perf->peers[pidx];
 
-		if (pctx->status == -ENODATA)
-			break;
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"Port %d (%d), Global index %d:\n",
+			ntb_peer_port_number(perf->ntb, peer->pidx), peer->pidx,
+			peer->gidx);
 
-		if (pctx->status) {
-			out_off += scnprintf(buf + out_off, 1024 - out_off,
-					    "%d: error %d\n", i,
-					    pctx->status);
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tLink status: %s\n",
+			test_bit(PERF_STS_LNKUP, &peer->sts) ? "up" : "down");
+
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tOut buffer addr 0x%pK\n", peer->outbuf);
+
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tOut buffer size %pa\n", &peer->outbuf_size);
+
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tOut buffer xlat 0x%016llx[p]\n", peer->outbuf_xlat);
+
+		if (!peer->inbuf) {
+			pos += scnprintf(buf + pos, buf_size - pos,
+				"\tIn buffer addr: unallocated\n");
 			continue;
 		}
 
-		rate = div64_u64(pctx->copied, pctx->diff_us);
-		out_off += scnprintf(buf + out_off, 1024 - out_off,
-			"%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n",
-			i, pctx->copied, pctx->diff_us, rate);
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tIn buffer addr 0x%pK\n", peer->inbuf);
+
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tIn buffer size %pa\n", &peer->inbuf_size);
+
+		pos += scnprintf(buf + pos, buf_size - pos,
+			"\tIn buffer xlat %pad[p]\n", &peer->inbuf_xlat);
 	}
 
-read_from_buf:
-	ret = simple_read_from_buffer(ubuf, count, offp, buf, out_off);
+	ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
 	kfree(buf);
 
 	return ret;
 }
 
-static void threads_cleanup(struct perf_ctx *perf)
+static const struct file_operations perf_dbgfs_info = {
+	.open = simple_open,
+	.read = perf_dbgfs_read_info
+};
+
+static ssize_t perf_dbgfs_read_run(struct file *filep, char __user *ubuf,
+				   size_t size, loff_t *offp)
 {
-	struct pthr_ctx *pctx;
-	int i;
+	struct perf_ctx *perf = filep->private_data;
+	ssize_t ret, pos = 0;
+	char *buf;
 
-	for (i = 0; i < MAX_THREADS; i++) {
-		pctx = &perf->pthr_ctx[i];
-		if (pctx->thread) {
-			pctx->status = kthread_stop(pctx->thread);
-			pctx->thread = NULL;
-		}
-	}
-}
+	buf = kmalloc(1024, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
 
-static void perf_clear_thread_status(struct perf_ctx *perf)
-{
-	int i;
+	ret = perf_read_stats(perf, buf, 1024, &pos);
+	if (ret)
+		goto err_free;
 
-	for (i = 0; i < MAX_THREADS; i++)
-		perf->pthr_ctx[i].status = -ENODATA;
+	ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
+err_free:
+	kfree(buf);
+
+	return ret;
 }
 
-static ssize_t debugfs_run_write(struct file *filp, const char __user *ubuf,
-				 size_t count, loff_t *offp)
+static ssize_t perf_dbgfs_write_run(struct file *filep, const char __user *ubuf,
+				    size_t size, loff_t *offp)
 {
-	struct perf_ctx *perf = filp->private_data;
-	int node, i;
-	DECLARE_WAIT_QUEUE_HEAD(wq);
+	struct perf_ctx *perf = filep->private_data;
+	struct perf_peer *peer;
+	int pidx, ret;
 
-	if (wait_event_interruptible(perf->link_wq, perf->link_is_up))
-		return -ENOLINK;
+	ret = kstrtoint_from_user(ubuf, size, 0, &pidx);
+	if (ret)
+		return ret;
 
-	if (perf->perf_threads == 0)
+	if (pidx < 0 || pidx >= perf->pcnt)
 		return -EINVAL;
 
-	if (!mutex_trylock(&perf->run_mutex))
-		return -EBUSY;
+	peer = &perf->peers[pidx];
 
-	perf_clear_thread_status(perf);
+	ret = perf_submit_test(peer);
+	if (ret)
+		return ret;
 
-	if (perf->perf_threads > MAX_THREADS) {
-		perf->perf_threads = MAX_THREADS;
-		pr_info("Reset total threads to: %u\n", MAX_THREADS);
-	}
+	return size;
+}
 
-	/* no greater than 1M */
-	if (seg_order > MAX_SEG_ORDER) {
-		seg_order = MAX_SEG_ORDER;
-		pr_info("Fix seg_order to %u\n", seg_order);
-	}
+static const struct file_operations perf_dbgfs_run = {
+	.open = simple_open,
+	.read = perf_dbgfs_read_run,
+	.write = perf_dbgfs_write_run
+};
 
-	if (run_order < seg_order) {
-		run_order = seg_order;
-		pr_info("Fix run_order to %u\n", run_order);
-	}
+static ssize_t perf_dbgfs_read_tcnt(struct file *filep, char __user *ubuf,
+				    size_t size, loff_t *offp)
+{
+	struct perf_ctx *perf = filep->private_data;
+	char buf[8];
+	ssize_t pos;
 
-	node = on_node ? dev_to_node(&perf->ntb->pdev->dev)
-		       : NUMA_NO_NODE;
-	atomic_set(&perf->tdone, 0);
+	pos = scnprintf(buf, sizeof(buf), "%hhu\n", perf->tcnt);
 
-	/* launch kernel thread */
-	for (i = 0; i < perf->perf_threads; i++) {
-		struct pthr_ctx *pctx;
+	return simple_read_from_buffer(ubuf, size, offp, buf, pos);
+}
 
-		pctx = &perf->pthr_ctx[i];
-		atomic_set(&pctx->dma_sync, 0);
-		pctx->perf = perf;
-		pctx->wq = &wq;
-		pctx->thread =
-			kthread_create_on_node(ntb_perf_thread,
-					       (void *)pctx,
-					       node, "ntb_perf %d", i);
-		if (IS_ERR(pctx->thread)) {
-			pctx->thread = NULL;
-			goto err;
-		} else {
-			wake_up_process(pctx->thread);
-		}
-	}
+static ssize_t perf_dbgfs_write_tcnt(struct file *filep,
+				     const char __user *ubuf,
+				     size_t size, loff_t *offp)
+{
+	struct perf_ctx *perf = filep->private_data;
+	int ret;
+	u8 val;
 
-	wait_event_interruptible(wq,
-		atomic_read(&perf->tdone) == perf->perf_threads);
+	ret = kstrtou8_from_user(ubuf, size, 0, &val);
+	if (ret)
+		return ret;
 
-	threads_cleanup(perf);
-	mutex_unlock(&perf->run_mutex);
-	return count;
+	ret = perf_set_tcnt(perf, val);
+	if (ret)
+		return ret;
 
-err:
-	threads_cleanup(perf);
-	mutex_unlock(&perf->run_mutex);
-	return -ENXIO;
+	return size;
 }
 
-static const struct file_operations ntb_perf_debugfs_run = {
-	.owner = THIS_MODULE,
+static const struct file_operations perf_dbgfs_tcnt = {
 	.open = simple_open,
-	.read = debugfs_run_read,
-	.write = debugfs_run_write,
+	.read = perf_dbgfs_read_tcnt,
+	.write = perf_dbgfs_write_tcnt
 };
 
-static int perf_debugfs_setup(struct perf_ctx *perf)
+static void perf_setup_dbgfs(struct perf_ctx *perf)
 {
 	struct pci_dev *pdev = perf->ntb->pdev;
-	struct dentry *debugfs_node_dir;
-	struct dentry *debugfs_run;
-	struct dentry *debugfs_threads;
-	struct dentry *debugfs_seg_order;
-	struct dentry *debugfs_run_order;
-	struct dentry *debugfs_use_dma;
-	struct dentry *debugfs_on_node;
-
-	if (!debugfs_initialized())
-		return -ENODEV;
 
-	/* Assumpion: only one NTB device in the system */
-	if (!perf_debugfs_dir) {
-		perf_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
-		if (!perf_debugfs_dir)
-			return -ENODEV;
-	}
-
-	debugfs_node_dir = debugfs_create_dir(pci_name(pdev),
-					      perf_debugfs_dir);
-	if (!debugfs_node_dir)
-		goto err;
-
-	debugfs_run = debugfs_create_file("run", S_IRUSR | S_IWUSR,
-					  debugfs_node_dir, perf,
-					  &ntb_perf_debugfs_run);
-	if (!debugfs_run)
-		goto err;
-
-	debugfs_threads = debugfs_create_u8("threads", S_IRUSR | S_IWUSR,
-					    debugfs_node_dir,
-					    &perf->perf_threads);
-	if (!debugfs_threads)
-		goto err;
-
-	debugfs_seg_order = debugfs_create_u32("seg_order", 0600,
-					       debugfs_node_dir,
-					       &seg_order);
-	if (!debugfs_seg_order)
-		goto err;
-
-	debugfs_run_order = debugfs_create_u32("run_order", 0600,
-					       debugfs_node_dir,
-					       &run_order);
-	if (!debugfs_run_order)
-		goto err;
-
-	debugfs_use_dma = debugfs_create_bool("use_dma", 0600,
-					       debugfs_node_dir,
-					       &use_dma);
-	if (!debugfs_use_dma)
-		goto err;
-
-	debugfs_on_node = debugfs_create_bool("on_node", 0600,
-					      debugfs_node_dir,
-					      &on_node);
-	if (!debugfs_on_node)
-		goto err;
+	perf->dbgfs_dir = debugfs_create_dir(pci_name(pdev), perf_dbgfs_topdir);
+	if (!perf->dbgfs_dir) {
+		dev_warn(&perf->ntb->dev, "DebugFS unsupported\n");
+		return;
+	}
+
+	debugfs_create_file("info", 0600, perf->dbgfs_dir, perf,
+			    &perf_dbgfs_info);
 
-	return 0;
+	debugfs_create_file("run", 0600, perf->dbgfs_dir, perf,
+			    &perf_dbgfs_run);
+
+	debugfs_create_file("threads_count", 0600, perf->dbgfs_dir, perf,
+			    &perf_dbgfs_tcnt);
 
-err:
-	debugfs_remove_recursive(perf_debugfs_dir);
-	perf_debugfs_dir = NULL;
-	return -ENODEV;
+	/* They are made read-only for test exec safety and integrity */
+	debugfs_create_u8("chunk_order", 0500, perf->dbgfs_dir, &chunk_order);
+
+	debugfs_create_u8("total_order", 0500, perf->dbgfs_dir, &total_order);
+
+	debugfs_create_bool("use_dma", 0500, perf->dbgfs_dir, &use_dma);
 }
 
-static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
+static void perf_clear_dbgfs(struct perf_ctx *perf)
+{
+	debugfs_remove_recursive(perf->dbgfs_dir);
+}
+
+/*==============================================================================
+ *                        Basic driver initialization
+ *==============================================================================
+ */
+
+static struct perf_ctx *perf_create_data(struct ntb_dev *ntb)
 {
-	struct pci_dev *pdev = ntb->pdev;
 	struct perf_ctx *perf;
-	int node;
-	int rc = 0;
 
-	if (ntb_spad_count(ntb) < MAX_SPAD) {
-		dev_err(&ntb->dev, "Not enough scratch pad registers for %s",
-			DRIVER_NAME);
-		return -EIO;
-	}
+	perf = devm_kzalloc(&ntb->dev, sizeof(*perf), GFP_KERNEL);
+	if (!perf)
+		return ERR_PTR(-ENOMEM);
 
-	if (!ntb->ops->mw_set_trans) {
-		dev_err(&ntb->dev, "Need inbound MW based NTB API\n");
-		return -EINVAL;
+	perf->pcnt = ntb_peer_port_count(ntb);
+	perf->peers = devm_kcalloc(&ntb->dev, perf->pcnt, sizeof(*perf->peers),
+				  GFP_KERNEL);
+	if (!perf->peers)
+		return ERR_PTR(-ENOMEM);
+
+	perf->ntb = ntb;
+
+	return perf;
+}
+
+static int perf_setup_peer_mw(struct perf_peer *peer)
+{
+	struct perf_ctx *perf = peer->perf;
+	phys_addr_t phys_addr;
+	int ret;
+
+	/* Get inbound MW parameters */
+	ret = ntb_mw_get_align(perf->ntb, peer->pidx, peer->gidx,
+			       &peer->xlat_align,
+			       &peer->size_align, &peer->size_max);
+	if (ret)
+		return ret;
+
+	/* Get outbound MW parameters and map it */
+	ret = ntb_peer_mw_get_addr(perf->ntb, peer->gidx, &phys_addr,
+				   &peer->outbuf_size);
+	if (ret)
+		return ret;
+
+	peer->outbuf = devm_ioremap_wc(&perf->ntb->dev, phys_addr,
+					peer->outbuf_size);
+	if (!peer->outbuf)
+		return -ENOMEM;
+
+	if (max_mw_size && peer->outbuf_size > max_mw_size) {
+		peer->outbuf_size = max_mw_size;
+		dev_warn(&peer->perf->ntb->dev,
+			"Peer %d outbuf reduced to %#llx\n", peer->pidx,
+			peer->outbuf_size);
 	}
 
-	if (ntb_peer_port_count(ntb) != NTB_DEF_PEER_CNT)
-		dev_warn(&ntb->dev, "Multi-port NTB devices unsupported\n");
+	return 0;
+}
+
+static int perf_init_peers(struct perf_ctx *perf)
+{
+	struct perf_peer *peer;
+	int pidx, lport, ret;
+
+	lport = ntb_port_number(perf->ntb);
+	perf->gidx = -1;
+	for (pidx = 0; pidx < perf->pcnt; pidx++) {
+		peer = &perf->peers[pidx];
+
+		peer->perf = perf;
+		peer->pidx = pidx;
+		if (lport < ntb_peer_port_number(perf->ntb, pidx)) {
+			if (perf->gidx == -1)
+				perf->gidx = pidx;
+			peer->gidx = pidx + 1;
+		} else {
+			peer->gidx = pidx;
+		}
+		INIT_WORK(&peer->service, perf_service_work);
 
-	node = on_node ? dev_to_node(&pdev->dev) : NUMA_NO_NODE;
-	perf = kzalloc_node(sizeof(*perf), GFP_KERNEL, node);
-	if (!perf) {
-		rc = -ENOMEM;
-		goto err_perf;
+		ret = perf_setup_peer_mw(peer);
+		if (ret)
+			return ret;
 	}
 
-	perf->ntb = ntb;
-	perf->perf_threads = 1;
-	atomic_set(&perf->tsync, 0);
-	mutex_init(&perf->run_mutex);
-	spin_lock_init(&perf->db_lock);
-	perf_setup_mw(ntb, perf);
-	init_waitqueue_head(&perf->link_wq);
-	INIT_DELAYED_WORK(&perf->link_work, perf_link_work);
+	dev_dbg(&perf->ntb->dev, "Global port index %d\n", perf->gidx);
+
+	return 0;
+}
+
+static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
+{
+	struct perf_ctx *perf;
+	int ret;
 
-	rc = ntb_set_ctx(ntb, perf, &perf_ops);
-	if (rc)
-		goto err_ctx;
+	perf = perf_create_data(ntb);
+	if (IS_ERR(perf))
+		return PTR_ERR(perf);
 
-	perf->link_is_up = false;
-	ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
-	ntb_link_event(ntb);
+	ret = perf_init_peers(perf);
+	if (ret)
+		return ret;
 
-	rc = perf_debugfs_setup(perf);
-	if (rc)
-		goto err_ctx;
+	perf_init_threads(perf);
 
-	perf_clear_thread_status(perf);
+	ret = perf_init_service(perf);
+	if (ret)
+		return ret;
 
-	return 0;
+	ret = perf_enable_service(perf);
+	if (ret)
+		return ret;
 
-err_ctx:
-	cancel_delayed_work_sync(&perf->link_work);
-	kfree(perf);
-err_perf:
-	return rc;
+	perf_setup_dbgfs(perf);
+
+	return 0;
 }
 
 static void perf_remove(struct ntb_client *client, struct ntb_dev *ntb)
 {
 	struct perf_ctx *perf = ntb->ctx;
-	int i;
 
-	dev_dbg(&perf->ntb->dev, "%s called\n", __func__);
+	perf_clear_dbgfs(perf);
 
-	mutex_lock(&perf->run_mutex);
+	perf_disable_service(perf);
 
-	cancel_delayed_work_sync(&perf->link_work);
+	perf_clear_threads(perf);
+}
 
-	ntb_clear_ctx(ntb);
-	ntb_link_disable(ntb);
+static struct ntb_client perf_client = {
+	.ops = {
+		.probe = perf_probe,
+		.remove = perf_remove
+	}
+};
 
-	debugfs_remove_recursive(perf_debugfs_dir);
-	perf_debugfs_dir = NULL;
+static int __init perf_init(void)
+{
+	int ret;
 
-	if (use_dma) {
-		for (i = 0; i < MAX_THREADS; i++) {
-			struct pthr_ctx *pctx = &perf->pthr_ctx[i];
+	if (chunk_order > MAX_CHUNK_ORDER) {
+		chunk_order = MAX_CHUNK_ORDER;
+		pr_info("Chunk order reduced to %hhu\n", chunk_order);
+	}
 
-			if (pctx->dma_chan)
-				dma_release_channel(pctx->dma_chan);
-		}
+	if (total_order < chunk_order) {
+		total_order = chunk_order;
+		pr_info("Total data order reduced to %hhu\n", total_order);
+	}
+
+	perf_wq = alloc_workqueue("perf_wq", WQ_UNBOUND | WQ_SYSFS, 0);
+	if (!perf_wq)
+		return -ENOMEM;
+
+	if (debugfs_initialized())
+		perf_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+
+	ret = ntb_register_client(&perf_client);
+	if (ret) {
+		debugfs_remove_recursive(perf_dbgfs_topdir);
+		destroy_workqueue(perf_wq);
 	}
 
-	kfree(perf);
+	return ret;
 }
+module_init(perf_init);
+
+static void __exit perf_exit(void)
+{
+	ntb_unregister_client(&perf_client);
+	debugfs_remove_recursive(perf_dbgfs_topdir);
+	destroy_workqueue(perf_wq);
+}
+module_exit(perf_exit);
 
-static struct ntb_client perf_client = {
-	.ops = {
-		.probe = perf_probe,
-		.remove = perf_remove,
-	},
-};
-module_ntb_client(perf_client);
-- 
2.12.0

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