ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/ntb/test/ntb_perf.c b/marvell/linux/drivers/ntb/test/ntb_perf.c
new file mode 100644
index 0000000..251fe75
--- /dev/null
+++ b/marvell/linux/drivers/ntb/test/ntb_perf.c
@@ -0,0 +1,1537 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * 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
+ * published by the Free Software Foundation.
+ *
+ * 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
+ * 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 copy
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ *
+ * PCIe NTB Perf Linux driver
+ */
+
+/*
+ * 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/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/delay.h>
+#include <linux/sizes.h>
+#include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/random.h>
+#include <linux/ntb.h>
+
+#define DRIVER_NAME "ntb_perf"
+#define DRIVER_VERSION "2.0"
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_AUTHOR("Dave Jiang <dave.jiang@intel.com>");
+MODULE_DESCRIPTION("PCIe NTB Performance Measurement Tool");
+
+#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 1000
+#define MSG_UDELAY_LOW 1000
+#define MSG_UDELAY_HIGH 2000
+
+#define PERF_BUF_LEN 1024
+
+static unsigned long max_mw_size;
+module_param(max_mw_size, ulong, 0644);
+MODULE_PARM_DESC(max_mw_size, "Upper limit of memory window size");
+
+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 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, "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 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 */
+ dma_addr_t inbuf_xlat;
+ resource_size_t inbuf_size;
+ void *inbuf;
+
+ /* NTB connection setup service */
+ struct work_struct service;
+ unsigned long sts;
+
+ struct completion init_comp;
+};
+#define to_peer_service(__work) \
+ container_of(__work, struct perf_peer, service)
+
+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)
+
+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;
+};
+
+/*
+ * Scratchpads-base commands interface
+ */
+#define PERF_SPAD_CNT(_pcnt) \
+ (3*((_pcnt) + 1))
+#define PERF_SPAD_CMD(_gidx) \
+ (3*(_gidx))
+#define PERF_SPAD_LDATA(_gidx) \
+ (3*(_gidx) + 1)
+#define PERF_SPAD_HDATA(_gidx) \
+ (3*(_gidx) + 2)
+#define PERF_SPAD_NOTIFY(_gidx) \
+ (BIT_ULL(_gidx))
+
+/*
+ * Messages-base commands interface
+ */
+#define PERF_MSG_CNT 3
+#define PERF_MSG_CMD 0
+#define PERF_MSG_LDATA 1
+#define PERF_MSG_HDATA 2
+
+/*==============================================================================
+ * 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;
+ u32 sts;
+
+ dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data);
+
+ /*
+ * 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.
+ */
+ for (try = 0; try < MSG_TRIES; try++) {
+ if (!perf_link_is_up(peer))
+ return -ENOLINK;
+
+ sts = ntb_peer_spad_read(perf->ntb, peer->pidx,
+ PERF_SPAD_CMD(perf->gidx));
+ if (sts != PERF_CMD_INVAL) {
+ usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
+ continue;
+ }
+
+ ntb_peer_spad_write(perf->ntb, peer->pidx,
+ PERF_SPAD_LDATA(perf->gidx),
+ lower_32_bits(data));
+ ntb_peer_spad_write(perf->ntb, peer->pidx,
+ PERF_SPAD_HDATA(perf->gidx),
+ upper_32_bits(data));
+ ntb_peer_spad_write(perf->ntb, peer->pidx,
+ PERF_SPAD_CMD(perf->gidx),
+ cmd);
+ ntb_peer_db_set(perf->ntb, PERF_SPAD_NOTIFY(peer->gidx));
+
+ dev_dbg(&perf->ntb->dev, "DB ring peer %#llx\n",
+ PERF_SPAD_NOTIFY(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;
+ u32 val;
+
+ ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(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;
+
+ val = ntb_spad_read(perf->ntb, PERF_SPAD_CMD(peer->gidx));
+ if (val == PERF_CMD_INVAL)
+ continue;
+
+ *cmd = val;
+
+ val = ntb_spad_read(perf->ntb, PERF_SPAD_LDATA(peer->gidx));
+ *data = val;
+
+ val = ntb_spad_read(perf->ntb, PERF_SPAD_HDATA(peer->gidx));
+ *data |= (u64)val << 32;
+
+ /* Next command can be retrieved from now */
+ ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx),
+ PERF_CMD_INVAL);
+
+ dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data);
+
+ 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;
+
+ dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data);
+
+ /*
+ * 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, PERF_MSG_LDATA,
+ 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, PERF_MSG_HDATA,
+ upper_32_bits(data));
+
+ /* This call shall trigger peer message event */
+ ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_CMD, 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, PERF_MSG_CMD);
+ *cmd = val;
+
+ val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_LDATA);
+ *data = val;
+
+ val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_HDATA);
+ *data |= (u64)val << 32;
+
+ /* Next command can be retrieved from now */
+ ntb_msg_clear_sts(perf->ntb, inbits);
+
+ dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data);
+
+ 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);
+
+ dev_dbg(&peer->perf->ntb->dev, "CMD exec: %d\n", cmd);
+
+ (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 0 if no data left to process, otherwise an error */
+ 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;
+
+ for (pidx = 0; pidx < perf->pcnt; pidx++) {
+ peer = &perf->peers[pidx];
+
+ lnk_up = perf_link_is_up(peer);
+
+ 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;
+
+ 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));
+
+ /* 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_free_outbuf(struct perf_peer *peer)
+{
+ (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);
+ complete_all(&peer->init_comp);
+
+ return 0;
+}
+
+static void perf_free_inbuf(struct perf_peer *peer)
+{
+ if (!peer->inbuf)
+ return;
+
+ (void)ntb_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
+ dma_free_coherent(&peer->perf->ntb->pdev->dev, peer->inbuf_size,
+ peer->inbuf, peer->inbuf_xlat);
+ peer->inbuf = NULL;
+}
+
+static int perf_setup_inbuf(struct perf_peer *peer)
+{
+ resource_size_t xlat_align, size_align, size_max;
+ struct perf_ctx *perf = peer->perf;
+ int ret;
+
+ /* Get inbound MW parameters */
+ ret = ntb_mw_get_align(perf->ntb, peer->pidx, perf->gidx,
+ &xlat_align, &size_align, &size_max);
+ if (ret) {
+ dev_err(&perf->ntb->dev, "Couldn't get inbuf restrictions\n");
+ return ret;
+ }
+
+ if (peer->inbuf_size > size_max) {
+ dev_err(&perf->ntb->dev, "Too big inbuf size %pa > %pa\n",
+ &peer->inbuf_size, &size_max);
+ return -EINVAL;
+ }
+
+ peer->inbuf_size = round_up(peer->inbuf_size, size_align);
+
+ perf_free_inbuf(peer);
+
+ peer->inbuf = dma_alloc_coherent(&perf->ntb->pdev->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, xlat_align)) {
+ ret = -EINVAL;
+ dev_err(&perf->ntb->dev, "Unaligned inbuf allocated\n");
+ goto err_free_inbuf;
+ }
+
+ 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;
+ }
+
+ /*
+ * 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);
+
+ return 0;
+
+err_free_inbuf:
+ perf_free_inbuf(peer);
+
+ return ret;
+}
+
+static void perf_service_work(struct work_struct *work)
+{
+ struct perf_peer *peer = to_peer_service(work);
+
+ if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts))
+ perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size);
+
+ if (test_and_clear_bit(PERF_CMD_RSIZE, &peer->sts))
+ perf_setup_inbuf(peer);
+
+ if (test_and_clear_bit(PERF_CMD_SXLAT, &peer->sts))
+ perf_cmd_send(peer, PERF_CMD_SXLAT, peer->inbuf_xlat);
+
+ if (test_and_clear_bit(PERF_CMD_RXLAT, &peer->sts))
+ perf_setup_outbuf(peer);
+
+ if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) {
+ init_completion(&peer->init_comp);
+ 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 (ntb_peer_mw_count(perf->ntb) < perf->pcnt) {
+ dev_err(&perf->ntb->dev, "Not enough memory windows\n");
+ return -EINVAL;
+ }
+
+ if (ntb_msg_count(perf->ntb) >= PERF_MSG_CNT) {
+ 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;
+ }
+
+ dev_dbg(&perf->ntb->dev, "Message service unsupported\n");
+
+ mask = GENMASK_ULL(perf->pcnt, 0);
+ if (ntb_spad_count(perf->ntb) >= PERF_SPAD_CNT(perf->pcnt) &&
+ (ntb_db_valid_mask(perf->ntb) & mask) == mask) {
+ perf->cmd_send = perf_spad_cmd_send;
+ perf->cmd_recv = perf_spad_cmd_recv;
+
+ dev_dbg(&perf->ntb->dev, "Scratchpad service initialized\n");
+
+ return 0;
+ }
+
+ dev_dbg(&perf->ntb->dev, "Scratchpad service unsupported\n");
+
+ dev_err(&perf->ntb->dev, "Command services unsupported\n");
+
+ return -EINVAL;
+}
+
+static int perf_enable_service(struct perf_ctx *perf)
+{
+ u64 mask, incmd_bit;
+ int ret, sidx, scnt;
+
+ 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);
+
+ incmd_bit = BIT_ULL(__ffs64(inbits));
+ ret = ntb_msg_clear_mask(perf->ntb, incmd_bit);
+
+ dev_dbg(&perf->ntb->dev, "MSG sts unmasked %#llx\n", incmd_bit);
+ } else {
+ scnt = ntb_spad_count(perf->ntb);
+ for (sidx = 0; sidx < scnt; sidx++)
+ ntb_spad_write(perf->ntb, sidx, PERF_CMD_INVAL);
+ incmd_bit = PERF_SPAD_NOTIFY(perf->gidx);
+ ret = ntb_db_clear_mask(perf->ntb, incmd_bit);
+
+ dev_dbg(&perf->ntb->dev, "DB bits unmasked %#llx\n", 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 void perf_disable_service(struct perf_ctx *perf)
+{
+ int pidx;
+
+ if (perf->cmd_send == perf_msg_cmd_send) {
+ u64 inbits;
+
+ inbits = ntb_msg_inbits(perf->ntb);
+ (void)ntb_msg_set_mask(perf->ntb, inbits);
+ } else {
+ (void)ntb_db_set_mask(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
+ }
+
+ ntb_clear_ctx(perf->ntb);
+
+ for (pidx = 0; pidx < perf->pcnt; pidx++)
+ perf_cmd_exec(&perf->peers[pidx], PERF_CMD_CLEAR);
+
+ for (pidx = 0; pidx < perf->pcnt; pidx++)
+ flush_work(&perf->peers[pidx].service);
+
+ for (pidx = 0; pidx < perf->pcnt; pidx++) {
+ struct perf_peer *peer = &perf->peers[pidx];
+
+ ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx), 0);
+ }
+
+ ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
+
+ ntb_link_disable(perf->ntb);
+}
+
+/*==============================================================================
+ * Performance measuring work-thread
+ *==============================================================================
+ */
+
+static void perf_dma_copy_callback(void *data)
+{
+ struct perf_thread *pthr = data;
+
+ atomic_dec(&pthr->dma_sync);
+ wake_up(&pthr->dma_wait);
+}
+
+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 = 0, ret = 0;
+
+ if (!use_dma) {
+ memcpy_toio(dst, src, len);
+ goto ret_check_tsync;
+ }
+
+ dma_dev = pthr->dma_chan->device->dev;
+
+ 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;
+
+ 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;
+ }
+
+ tx->callback = perf_dma_copy_callback;
+ tx->callback_param = pthr;
+ dma_set_unmap(tx, unmap);
+
+ ret = dma_submit_error(dmaengine_submit(tx));
+ if (ret) {
+ dmaengine_unmap_put(unmap);
+ goto err_free_resource;
+ }
+
+ 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;
+ }
+
+ 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();
+ }
+
+ return 0;
+}
+
+static int perf_sync_test(struct perf_thread *pthr)
+{
+ struct perf_ctx *perf = pthr->perf;
+
+ 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);
+
+ 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 void perf_clear_test(struct perf_thread *pthr)
+{
+ struct perf_ctx *perf = pthr->perf;
+
+ if (!use_dma)
+ goto no_dma_notify;
+
+ /*
+ * 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);
+
+ dma_release_channel(pthr->dma_chan);
+
+no_dma_notify:
+ atomic_dec(&perf->tsync);
+ wake_up(&perf->twait);
+ kfree(pthr->src);
+}
+
+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;
+ }
+
+ ret = perf_run_test(pthr);
+ if (ret) {
+ pthr->status = ret;
+ goto err_clear_test;
+ }
+
+ pthr->status = perf_sync_test(pthr);
+
+err_clear_test:
+ perf_clear_test(pthr);
+}
+
+static int perf_set_tcnt(struct perf_ctx *perf, u8 tcnt)
+{
+ if (tcnt == 0 || tcnt > MAX_THREADS_CNT)
+ return -EINVAL;
+
+ if (test_and_set_bit_lock(0, &perf->busy_flag))
+ return -EBUSY;
+
+ perf->tcnt = tcnt;
+
+ clear_bit_unlock(0, &perf->busy_flag);
+
+ return 0;
+}
+
+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);
+ }
+}
+
+static int perf_submit_test(struct perf_peer *peer)
+{
+ struct perf_ctx *perf = peer->perf;
+ struct perf_thread *pthr;
+ int tidx, ret;
+
+ ret = wait_for_completion_interruptible(&peer->init_comp);
+ if (ret < 0)
+ return ret;
+
+ if (test_and_set_bit_lock(0, &perf->busy_flag))
+ return -EBUSY;
+
+ perf->test_peer = peer;
+ atomic_set(&perf->tsync, perf->tcnt);
+
+ for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
+ pthr = &perf->threads[tidx];
+
+ 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;
+ }
+
+ clear_bit_unlock(0, &perf->busy_flag);
+
+ return ret;
+}
+
+static int perf_read_stats(struct perf_ctx *perf, char *buf,
+ size_t size, ssize_t *pos)
+{
+ struct perf_thread *pthr;
+ int tidx;
+
+ if (test_and_set_bit_lock(0, &perf->busy_flag))
+ return -EBUSY;
+
+ (*pos) += scnprintf(buf + *pos, size - *pos,
+ " Peer %d test statistics:\n", perf->test_peer->pidx);
+
+ for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
+ pthr = &perf->threads[tidx];
+
+ 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 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 = filep->private_data;
+ struct perf_peer *peer;
+ size_t buf_size;
+ ssize_t pos = 0;
+ int ret, pidx;
+ char *buf;
+
+ buf_size = min_t(size_t, size, 0x1000U);
+
+ buf = kmalloc(buf_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ 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 (pidx = 0; pidx < perf->pcnt; pidx++) {
+ peer = &perf->peers[pidx];
+
+ 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);
+
+ 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;
+ }
+
+ 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);
+ }
+
+ ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
+ kfree(buf);
+
+ return ret;
+}
+
+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 perf_ctx *perf = filep->private_data;
+ ssize_t ret, pos = 0;
+ char *buf;
+
+ buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = perf_read_stats(perf, buf, PERF_BUF_LEN, &pos);
+ if (ret)
+ goto err_free;
+
+ ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
+err_free:
+ kfree(buf);
+
+ return ret;
+}
+
+static ssize_t perf_dbgfs_write_run(struct file *filep, const char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct perf_ctx *perf = filep->private_data;
+ struct perf_peer *peer;
+ int pidx, ret;
+
+ ret = kstrtoint_from_user(ubuf, size, 0, &pidx);
+ if (ret)
+ return ret;
+
+ if (pidx < 0 || pidx >= perf->pcnt)
+ return -EINVAL;
+
+ peer = &perf->peers[pidx];
+
+ ret = perf_submit_test(peer);
+ if (ret)
+ return ret;
+
+ return size;
+}
+
+static const struct file_operations perf_dbgfs_run = {
+ .open = simple_open,
+ .read = perf_dbgfs_read_run,
+ .write = perf_dbgfs_write_run
+};
+
+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;
+
+ pos = scnprintf(buf, sizeof(buf), "%hhu\n", perf->tcnt);
+
+ return simple_read_from_buffer(ubuf, size, offp, buf, pos);
+}
+
+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;
+
+ ret = kstrtou8_from_user(ubuf, size, 0, &val);
+ if (ret)
+ return ret;
+
+ ret = perf_set_tcnt(perf, val);
+ if (ret)
+ return ret;
+
+ return size;
+}
+
+static const struct file_operations perf_dbgfs_tcnt = {
+ .open = simple_open,
+ .read = perf_dbgfs_read_tcnt,
+ .write = perf_dbgfs_write_tcnt
+};
+
+static void perf_setup_dbgfs(struct perf_ctx *perf)
+{
+ struct pci_dev *pdev = perf->ntb->pdev;
+
+ 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);
+
+ 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);
+
+ /* 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 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 perf_ctx *perf;
+
+ perf = devm_kzalloc(&ntb->dev, sizeof(*perf), GFP_KERNEL);
+ if (!perf)
+ return ERR_PTR(-ENOMEM);
+
+ 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 outbound MW parameters and map it */
+ ret = ntb_peer_mw_get_addr(perf->ntb, perf->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 %pa\n", peer->pidx,
+ &peer->outbuf_size);
+ }
+
+ 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);
+ init_completion(&peer->init_comp);
+ }
+ if (perf->gidx == -1)
+ perf->gidx = pidx;
+
+ /*
+ * Hardware with only two ports may not have unique port
+ * numbers. In this case, the gidxs should all be zero.
+ */
+ if (perf->pcnt == 1 && ntb_port_number(perf->ntb) == 0 &&
+ ntb_peer_port_number(perf->ntb, 0) == 0) {
+ perf->gidx = 0;
+ perf->peers[0].gidx = 0;
+ }
+
+ for (pidx = 0; pidx < perf->pcnt; pidx++) {
+ ret = perf_setup_peer_mw(&perf->peers[pidx]);
+ if (ret)
+ return ret;
+ }
+
+ 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;
+
+ perf = perf_create_data(ntb);
+ if (IS_ERR(perf))
+ return PTR_ERR(perf);
+
+ ret = perf_init_peers(perf);
+ if (ret)
+ return ret;
+
+ perf_init_threads(perf);
+
+ ret = perf_init_service(perf);
+ if (ret)
+ return ret;
+
+ ret = perf_enable_service(perf);
+ if (ret)
+ return ret;
+
+ perf_setup_dbgfs(perf);
+
+ return 0;
+}
+
+static void perf_remove(struct ntb_client *client, struct ntb_dev *ntb)
+{
+ struct perf_ctx *perf = ntb->ctx;
+
+ perf_clear_dbgfs(perf);
+
+ perf_disable_service(perf);
+
+ perf_clear_threads(perf);
+}
+
+static struct ntb_client perf_client = {
+ .ops = {
+ .probe = perf_probe,
+ .remove = perf_remove
+ }
+};
+
+static int __init perf_init(void)
+{
+ int ret;
+
+ if (chunk_order > MAX_CHUNK_ORDER) {
+ chunk_order = MAX_CHUNK_ORDER;
+ pr_info("Chunk order reduced to %hhu\n", chunk_order);
+ }
+
+ 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);
+ }
+
+ 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);