diff options
Diffstat (limited to 'drivers/ntb/test/ntb_perf.c')
| -rw-r--r-- | drivers/ntb/test/ntb_perf.c | 1567 |
1 files changed, 1567 insertions, 0 deletions
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c new file mode 100644 index 000000000..65e1e5cf1 --- /dev/null +++ b/drivers/ntb/test/ntb_perf.c @@ -0,0 +1,1567 @@ +/* + * 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 1000000 +#define MSG_UDELAY_HIGH 2000000 + +#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; + phys_addr_t out_phys_addr; + dma_addr_t dma_dst_addr; + /* 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; + struct perf_peer *peer = pthr->perf->test_peer; + void __iomem *vbase; + void __iomem *dst_vaddr; + dma_addr_t dst_dma_addr; + + 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; + + vbase = peer->outbuf; + dst_vaddr = dst; + dst_dma_addr = peer->dma_dst_addr + (dst_vaddr - vbase); + + unmap = dmaengine_get_unmap_data(dma_dev, 1, 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; + + do { + tx = dmaengine_prep_dma_memcpy(pthr->dma_chan, dst_dma_addr, + 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; + struct perf_peer *peer = pthr->perf->test_peer; + + 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); + goto err_free; + } + peer->dma_dst_addr = + dma_map_resource(pthr->dma_chan->device->dev, + peer->out_phys_addr, peer->outbuf_size, + DMA_FROM_DEVICE, 0); + if (dma_mapping_error(pthr->dma_chan->device->dev, + peer->dma_dst_addr)) { + dev_err(pthr->dma_chan->device->dev, "%d: Failed to map DMA addr\n", + pthr->tidx); + peer->dma_dst_addr = 0; + dma_release_channel(pthr->dma_chan); + goto err_free; + } + dev_dbg(pthr->dma_chan->device->dev, "%d: Map MMIO %pa to DMA addr %pad\n", + pthr->tidx, + &peer->out_phys_addr, + &peer->dma_dst_addr); + + atomic_set(&pthr->dma_sync, 0); + return 0; + +err_free: + atomic_dec(&perf->tsync); + wake_up(&perf->twait); + kfree(pthr->src); + return -ENODEV; +} + +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); + if (pthr->perf->test_peer->dma_dst_addr) + dma_unmap_resource(pthr->dma_chan->device->dev, + pthr->perf->test_peer->dma_dst_addr, + pthr->perf->test_peer->outbuf_size, + DMA_FROM_DEVICE, 0); + + 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 buff phys addr %pa[p]\n", &peer->out_phys_addr); + + 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; + + peer->out_phys_addr = phys_addr; + + 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); |