drivers/ntb/test/ntb_perf.c

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  *   redistributing this file, you may do so under either license.
   4  *
   5  *   GPL LICENSE SUMMARY
   6  *
   7  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
   8  *
   9  *   This program is free software; you can redistribute it and/or modify
  10  *   it under the terms of version 2 of the GNU General Public License as
  11  *   published by the Free Software Foundation.
  12  *
  13  *   BSD LICENSE
  14  *
  15  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
  16  *
  17  *   Redistribution and use in source and binary forms, with or without
  18  *   modification, are permitted provided that the following conditions
  19  *   are met:
  20  *
  21  *     * Redistributions of source code must retain the above copyright
  22  *       notice, this list of conditions and the following disclaimer.
  23  *     * Redistributions in binary form must reproduce the above copy
  24  *       notice, this list of conditions and the following disclaimer in
  25  *       the documentation and/or other materials provided with the
  26  *       distribution.
  27  *     * Neither the name of Intel Corporation nor the names of its
  28  *       contributors may be used to endorse or promote products derived
  29  *       from this software without specific prior written permission.
  30  *
  31  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  34  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  36  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  37  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  38  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  39  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  40  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  41  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42  *
  43  *   PCIe NTB Perf Linux driver
  44  */
  45
  46 #include <linux/init.h>
  47 #include <linux/kernel.h>
  48 #include <linux/module.h>
  49 #include <linux/kthread.h>
  50 #include <linux/time.h>
  51 #include <linux/timer.h>
  52 #include <linux/dma-mapping.h>
  53 #include <linux/pci.h>
  54 #include <linux/slab.h>
  55 #include <linux/spinlock.h>
  56 #include <linux/debugfs.h>
  57 #include <linux/dmaengine.h>
  58 #include <linux/delay.h>
  59 #include <linux/sizes.h>
  60 #include <linux/ntb.h>
  61
  62 #define DRIVER_NAME             "ntb_perf"
  63 #define DRIVER_DESCRIPTION      "PCIe NTB Performance Measurement Tool"
  64
  65 #define DRIVER_LICENSE          "Dual BSD/GPL"
  66 #define DRIVER_VERSION          "1.0"
  67 #define DRIVER_AUTHOR           "Dave Jiang <dave.jiang@intel.com>"
  68
  69 #define PERF_LINK_DOWN_TIMEOUT  10
  70 #define PERF_VERSION            0xffff0001
  71 #define MAX_THREADS             32
  72 #define MAX_TEST_SIZE           SZ_1M
  73 #define MAX_SRCS                32
  74 #define DMA_OUT_RESOURCE_TO     50
  75 #define DMA_RETRIES             20
  76 #define SZ_4G                   (1ULL << 32)
  77 #define MAX_SEG_ORDER           20 /* no larger than 1M for kmalloc buffer */
  78
  79 MODULE_LICENSE(DRIVER_LICENSE);
  80 MODULE_VERSION(DRIVER_VERSION);
  81 MODULE_AUTHOR(DRIVER_AUTHOR);
  82 MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
  83
  84 static struct dentry *perf_debugfs_dir;
  85
  86 static unsigned int seg_order = 19; /* 512K */
  87 module_param(seg_order, uint, 0644);
  88 MODULE_PARM_DESC(seg_order, "size order [n^2] of buffer segment for testing");
  89
  90 static unsigned int run_order = 32; /* 4G */
  91 module_param(run_order, uint, 0644);
  92 MODULE_PARM_DESC(run_order, "size order [n^2] of total data to transfer");
  93
  94 static bool use_dma; /* default to 0 */
  95 module_param(use_dma, bool, 0644);
  96 MODULE_PARM_DESC(use_dma, "Using DMA engine to measure performance");
  97
  98 struct perf_mw {
  99         phys_addr_t     phys_addr;
 100         resource_size_t phys_size;
 101         resource_size_t xlat_align;
 102         resource_size_t xlat_align_size;
 103         void __iomem    *vbase;
 104         size_t          xlat_size;
 105         size_t          buf_size;
 106         void            *virt_addr;
 107         dma_addr_t      dma_addr;
 108 };
 109
 110 struct perf_ctx;
 111
 112 struct pthr_ctx {
 113         struct task_struct      *thread;
 114         struct perf_ctx         *perf;
 115         atomic_t                dma_sync;
 116         struct dma_chan         *dma_chan;
 117         int                     dma_prep_err;
 118         int                     src_idx;
 119         void                    *srcs[MAX_SRCS];
 120 };
 121
 122 struct perf_ctx {
 123         struct ntb_dev          *ntb;
 124         spinlock_t              db_lock;
 125         struct perf_mw          mw;
 126         bool                    link_is_up;
 127         struct work_struct      link_cleanup;
 128         struct delayed_work     link_work;
 129         struct dentry           *debugfs_node_dir;
 130         struct dentry           *debugfs_run;
 131         struct dentry           *debugfs_threads;
 132         u8                      perf_threads;
 133         bool                    run;
 134         struct pthr_ctx         pthr_ctx[MAX_THREADS];
 135         atomic_t                tsync;
 136 };
 137
 138 enum {
 139         VERSION = 0,
 140         MW_SZ_HIGH,
 141         MW_SZ_LOW,
 142         SPAD_MSG,
 143         SPAD_ACK,
 144         MAX_SPAD
 145 };
 146
 147 static void perf_link_event(void *ctx)
 148 {
 149         struct perf_ctx *perf = ctx;
 150
 151         if (ntb_link_is_up(perf->ntb, NULL, NULL) == 1)
 152                 schedule_delayed_work(&perf->link_work, 2*HZ);
 153         else
 154                 schedule_work(&perf->link_cleanup);
 155 }
 156
 157 static void perf_db_event(void *ctx, int vec)
 158 {
 159         struct perf_ctx *perf = ctx;
 160         u64 db_bits, db_mask;
 161
 162         db_mask = ntb_db_vector_mask(perf->ntb, vec);
 163         db_bits = ntb_db_read(perf->ntb);
 164
 165         dev_dbg(&perf->ntb->dev, "doorbell vec %d mask %#llx bits %#llx\n",
 166                 vec, db_mask, db_bits);
 167 }
 168
 169 static const struct ntb_ctx_ops perf_ops = {
 170         .link_event = perf_link_event,
 171         .db_event = perf_db_event,
 172 };
 173
 174 static void perf_copy_callback(void *data)
 175 {
 176         struct pthr_ctx *pctx = data;
 177
 178         atomic_dec(&pctx->dma_sync);
 179 }
 180
 181 static ssize_t perf_copy(struct pthr_ctx *pctx, char *dst,
 182                          char *src, size_t size)
 183 {
 184         struct perf_ctx *perf = pctx->perf;
 185         struct dma_async_tx_descriptor *txd;
 186         struct dma_chan *chan = pctx->dma_chan;
 187         struct dma_device *device;
 188         struct dmaengine_unmap_data *unmap;
 189         dma_cookie_t cookie;
 190         size_t src_off, dst_off;
 191         struct perf_mw *mw = &perf->mw;
 192         u64 vbase, dst_vaddr;
 193         dma_addr_t dst_phys;
 194         int retries = 0;
 195
 196         if (!use_dma) {
 197                 memcpy_toio(dst, src, size);
 198                 return size;
 199         }
 200
 201         if (!chan) {
 202                 dev_err(&perf->ntb->dev, "DMA engine does not exist\n");
 203                 return -EINVAL;
 204         }
 205
 206         device = chan->device;
 207         src_off = (size_t)src & ~PAGE_MASK;
 208         dst_off = (size_t)dst & ~PAGE_MASK;
 209
 210         if (!is_dma_copy_aligned(device, src_off, dst_off, size))
 211                 return -ENODEV;
 212
 213         vbase = (u64)(u64 *)mw->vbase;
 214         dst_vaddr = (u64)(u64 *)dst;
 215         dst_phys = mw->phys_addr + (dst_vaddr - vbase);
 216
 217         unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT);
 218         if (!unmap)
 219                 return -ENOMEM;
 220
 221         unmap->len = size;
 222         unmap->addr[0] = dma_map_page(device->dev, virt_to_page(src),
 223                                       src_off, size, DMA_TO_DEVICE);
 224         if (dma_mapping_error(device->dev, unmap->addr[0]))
 225                 goto err_get_unmap;
 226
 227         unmap->to_cnt = 1;
 228
 229         do {
 230                 txd = device->device_prep_dma_memcpy(chan, dst_phys,
 231                                                      unmap->addr[0],
 232                                                      size, DMA_PREP_INTERRUPT);
 233                 if (!txd) {
 234                         set_current_state(TASK_INTERRUPTIBLE);
 235                         schedule_timeout(DMA_OUT_RESOURCE_TO);
 236                 }
 237         } while (!txd && (++retries < DMA_RETRIES));
 238
 239         if (!txd) {
 240                 pctx->dma_prep_err++;
 241                 goto err_get_unmap;
 242         }
 243
 244         txd->callback = perf_copy_callback;
 245         txd->callback_param = pctx;
 246         dma_set_unmap(txd, unmap);
 247
 248         cookie = dmaengine_submit(txd);
 249         if (dma_submit_error(cookie))
 250                 goto err_set_unmap;
 251
 252         atomic_inc(&pctx->dma_sync);
 253         dma_async_issue_pending(chan);
 254
 255         return size;
 256
 257 err_set_unmap:
 258         dmaengine_unmap_put(unmap);
 259 err_get_unmap:
 260         dmaengine_unmap_put(unmap);
 261         return 0;
 262 }
 263
 264 static int perf_move_data(struct pthr_ctx *pctx, char *dst, char *src,
 265                           u64 buf_size, u64 win_size, u64 total)
 266 {
 267         int chunks, total_chunks, i;
 268         int copied_chunks = 0;
 269         u64 copied = 0, result;
 270         char *tmp = dst;
 271         u64 perf, diff_us;
 272         ktime_t kstart, kstop, kdiff;
 273
 274         chunks = div64_u64(win_size, buf_size);
 275         total_chunks = div64_u64(total, buf_size);
 276         kstart = ktime_get();
 277
 278         for (i = 0; i < total_chunks; i++) {
 279                 result = perf_copy(pctx, tmp, src, buf_size);
 280                 copied += result;
 281                 copied_chunks++;
 282                 if (copied_chunks == chunks) {
 283                         tmp = dst;
 284                         copied_chunks = 0;
 285                 } else
 286                         tmp += buf_size;
 287
 288                 /* Probably should schedule every 4GB to prevent soft hang. */
 289                 if (((copied % SZ_4G) == 0) && !use_dma) {
 290                         set_current_state(TASK_INTERRUPTIBLE);
 291                         schedule_timeout(1);
 292                 }
 293         }
 294
 295         if (use_dma) {
 296                 pr_info("%s: All DMA descriptors submitted\n", current->comm);
 297                 while (atomic_read(&pctx->dma_sync) != 0)
 298                         msleep(20);
 299         }
 300
 301         kstop = ktime_get();
 302         kdiff = ktime_sub(kstop, kstart);
 303         diff_us = ktime_to_us(kdiff);
 304
 305         pr_info("%s: copied %llu bytes\n", current->comm, copied);
 306
 307         pr_info("%s: lasted %llu usecs\n", current->comm, diff_us);
 308
 309         perf = div64_u64(copied, diff_us);
 310
 311         pr_info("%s: MBytes/s: %llu\n", current->comm, perf);
 312
 313         return 0;
 314 }
 315
 316 static bool perf_dma_filter_fn(struct dma_chan *chan, void *node)
 317 {
 318         return dev_to_node(&chan->dev->device) == (int)(unsigned long)node;
 319 }
 320
 321 static int ntb_perf_thread(void *data)
 322 {
 323         struct pthr_ctx *pctx = data;
 324         struct perf_ctx *perf = pctx->perf;
 325         struct pci_dev *pdev = perf->ntb->pdev;
 326         struct perf_mw *mw = &perf->mw;
 327         char *dst;
 328         u64 win_size, buf_size, total;
 329         void *src;
 330         int rc, node, i;
 331         struct dma_chan *dma_chan = NULL;
 332
 333         pr_info("kthread %s starting...\n", current->comm);
 334
 335         node = dev_to_node(&pdev->dev);
 336
 337         if (use_dma && !pctx->dma_chan) {
 338                 dma_cap_mask_t dma_mask;
 339
 340                 dma_cap_zero(dma_mask);
 341                 dma_cap_set(DMA_MEMCPY, dma_mask);
 342                 dma_chan = dma_request_channel(dma_mask, perf_dma_filter_fn,
 343                                                (void *)(unsigned long)node);
 344                 if (!dma_chan) {
 345                         pr_warn("%s: cannot acquire DMA channel, quitting\n",
 346                                 current->comm);
 347                         return -ENODEV;
 348                 }
 349                 pctx->dma_chan = dma_chan;
 350         }
 351
 352         for (i = 0; i < MAX_SRCS; i++) {
 353                 pctx->srcs[i] = kmalloc_node(MAX_TEST_SIZE, GFP_KERNEL, node);
 354                 if (!pctx->srcs[i]) {
 355                         rc = -ENOMEM;
 356                         goto err;
 357                 }
 358         }
 359
 360         win_size = mw->phys_size;
 361         buf_size = 1ULL << seg_order;
 362         total = 1ULL << run_order;
 363
 364         if (buf_size > MAX_TEST_SIZE)
 365                 buf_size = MAX_TEST_SIZE;
 366
 367         dst = (char *)mw->vbase;
 368
 369         atomic_inc(&perf->tsync);
 370         while (atomic_read(&perf->tsync) != perf->perf_threads)
 371                 schedule();
 372
 373         src = pctx->srcs[pctx->src_idx];
 374         pctx->src_idx = (pctx->src_idx + 1) & (MAX_SRCS - 1);
 375
 376         rc = perf_move_data(pctx, dst, src, buf_size, win_size, total);
 377
 378         atomic_dec(&perf->tsync);
 379
 380         if (rc < 0) {
 381                 pr_err("%s: failed\n", current->comm);
 382                 rc = -ENXIO;
 383                 goto err;
 384         }
 385
 386         for (i = 0; i < MAX_SRCS; i++) {
 387                 kfree(pctx->srcs[i]);
 388                 pctx->srcs[i] = NULL;
 389         }
 390
 391         return 0;
 392
 393 err:
 394         for (i = 0; i < MAX_SRCS; i++) {
 395                 kfree(pctx->srcs[i]);
 396                 pctx->srcs[i] = NULL;
 397         }
 398
 399         if (dma_chan) {
 400                 dma_release_channel(dma_chan);
 401                 pctx->dma_chan = NULL;
 402         }
 403
 404         return rc;
 405 }
 406
 407 static void perf_free_mw(struct perf_ctx *perf)
 408 {
 409         struct perf_mw *mw = &perf->mw;
 410         struct pci_dev *pdev = perf->ntb->pdev;
 411
 412         if (!mw->virt_addr)
 413                 return;
 414
 415         ntb_mw_clear_trans(perf->ntb, 0);
 416         dma_free_coherent(&pdev->dev, mw->buf_size,
 417                           mw->virt_addr, mw->dma_addr);
 418         mw->xlat_size = 0;
 419         mw->buf_size = 0;
 420         mw->virt_addr = NULL;
 421 }
 422
 423 static int perf_set_mw(struct perf_ctx *perf, resource_size_t size)
 424 {
 425         struct perf_mw *mw = &perf->mw;
 426         size_t xlat_size, buf_size;
 427
 428         if (!size)
 429                 return -EINVAL;
 430
 431         xlat_size = round_up(size, mw->xlat_align_size);
 432         buf_size = round_up(size, mw->xlat_align);
 433
 434         if (mw->xlat_size == xlat_size)
 435                 return 0;
 436
 437         if (mw->buf_size)
 438                 perf_free_mw(perf);
 439
 440         mw->xlat_size = xlat_size;
 441         mw->buf_size = buf_size;
 442
 443         mw->virt_addr = dma_alloc_coherent(&perf->ntb->pdev->dev, buf_size,
 444                                            &mw->dma_addr, GFP_KERNEL);
 445         if (!mw->virt_addr) {
 446                 mw->xlat_size = 0;
 447                 mw->buf_size = 0;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static void perf_link_work(struct work_struct *work)
 454 {
 455         struct perf_ctx *perf =
 456                 container_of(work, struct perf_ctx, link_work.work);
 457         struct ntb_dev *ndev = perf->ntb;
 458         struct pci_dev *pdev = ndev->pdev;
 459         u32 val;
 460         u64 size;
 461         int rc;
 462
 463         dev_dbg(&perf->ntb->pdev->dev, "%s called\n", __func__);
 464
 465         size = perf->mw.phys_size;
 466         ntb_peer_spad_write(ndev, MW_SZ_HIGH, upper_32_bits(size));
 467         ntb_peer_spad_write(ndev, MW_SZ_LOW, lower_32_bits(size));
 468         ntb_peer_spad_write(ndev, VERSION, PERF_VERSION);
 469
 470         /* now read what peer wrote */
 471         val = ntb_spad_read(ndev, VERSION);
 472         if (val != PERF_VERSION) {
 473                 dev_dbg(&pdev->dev, "Remote version = %#x\n", val);
 474                 goto out;
 475         }
 476
 477         val = ntb_spad_read(ndev, MW_SZ_HIGH);
 478         size = (u64)val << 32;
 479
 480         val = ntb_spad_read(ndev, MW_SZ_LOW);
 481         size |= val;
 482
 483         dev_dbg(&pdev->dev, "Remote MW size = %#llx\n", size);
 484
 485         rc = perf_set_mw(perf, size);
 486         if (rc)
 487                 goto out1;
 488
 489         perf->link_is_up = true;
 490
 491         return;
 492
 493 out1:
 494         perf_free_mw(perf);
 495
 496 out:
 497         if (ntb_link_is_up(ndev, NULL, NULL) == 1)
 498                 schedule_delayed_work(&perf->link_work,
 499                                       msecs_to_jiffies(PERF_LINK_DOWN_TIMEOUT));
 500 }
 501
 502 static void perf_link_cleanup(struct work_struct *work)
 503 {
 504         struct perf_ctx *perf = container_of(work,
 505                                              struct perf_ctx,
 506                                              link_cleanup);
 507
 508         dev_dbg(&perf->ntb->pdev->dev, "%s called\n", __func__);
 509
 510         if (!perf->link_is_up)
 511                 cancel_delayed_work_sync(&perf->link_work);
 512 }
 513
 514 static int perf_setup_mw(struct ntb_dev *ntb, struct perf_ctx *perf)
 515 {
 516         struct perf_mw *mw;
 517         int rc;
 518
 519         mw = &perf->mw;
 520
 521         rc = ntb_mw_get_range(ntb, 0, &mw->phys_addr, &mw->phys_size,
 522                               &mw->xlat_align, &mw->xlat_align_size);
 523         if (rc)
 524                 return rc;
 525
 526         perf->mw.vbase = ioremap_wc(mw->phys_addr, mw->phys_size);
 527         if (!mw->vbase)
 528                 return -ENOMEM;
 529
 530         return 0;
 531 }
 532
 533 static ssize_t debugfs_run_read(struct file *filp, char __user *ubuf,
 534                                 size_t count, loff_t *offp)
 535 {
 536         struct perf_ctx *perf = filp->private_data;
 537         char *buf;
 538         ssize_t ret, out_offset;
 539
 540         if (!perf)
 541                 return 0;
 542
 543         buf = kmalloc(64, GFP_KERNEL);
 544         out_offset = snprintf(buf, 64, "%d\n", perf->run);
 545         ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
 546         kfree(buf);
 547
 548         return ret;
 549 }
 550
 551 static ssize_t debugfs_run_write(struct file *filp, const char __user *ubuf,
 552                                  size_t count, loff_t *offp)
 553 {
 554         struct perf_ctx *perf = filp->private_data;
 555         int node, i;
 556
 557         if (!perf->link_is_up)
 558                 return 0;
 559
 560         if (perf->perf_threads == 0)
 561                 return 0;
 562
 563         if (atomic_read(&perf->tsync) == 0)
 564                 perf->run = false;
 565
 566         if (perf->run) {
 567                 /* lets stop the threads */
 568                 perf->run = false;
 569                 for (i = 0; i < MAX_THREADS; i++) {
 570                         if (perf->pthr_ctx[i].thread) {
 571                                 kthread_stop(perf->pthr_ctx[i].thread);
 572                                 perf->pthr_ctx[i].thread = NULL;
 573                         } else
 574                                 break;
 575                 }
 576         } else {
 577                 perf->run = true;
 578
 579                 if (perf->perf_threads > MAX_THREADS) {
 580                         perf->perf_threads = MAX_THREADS;
 581                         pr_info("Reset total threads to: %u\n", MAX_THREADS);
 582                 }
 583
 584                 /* no greater than 1M */
 585                 if (seg_order > MAX_SEG_ORDER) {
 586                         seg_order = MAX_SEG_ORDER;
 587                         pr_info("Fix seg_order to %u\n", seg_order);
 588                 }
 589
 590                 if (run_order < seg_order) {
 591                         run_order = seg_order;
 592                         pr_info("Fix run_order to %u\n", run_order);
 593                 }
 594
 595                 node = dev_to_node(&perf->ntb->pdev->dev);
 596                 /* launch kernel thread */
 597                 for (i = 0; i < perf->perf_threads; i++) {
 598                         struct pthr_ctx *pctx;
 599
 600                         pctx = &perf->pthr_ctx[i];
 601                         atomic_set(&pctx->dma_sync, 0);
 602                         pctx->perf = perf;
 603                         pctx->thread =
 604                                 kthread_create_on_node(ntb_perf_thread,
 605                                                        (void *)pctx,
 606                                                        node, "ntb_perf %d", i);
 607                         if (pctx->thread)
 608                                 wake_up_process(pctx->thread);
 609                         else {
 610                                 perf->run = false;
 611                                 for (i = 0; i < MAX_THREADS; i++) {
 612                                         if (pctx->thread) {
 613                                                 kthread_stop(pctx->thread);
 614                                                 pctx->thread = NULL;
 615                                         }
 616                                 }
 617                         }
 618
 619                         if (perf->run == false)
 620                                 return -ENXIO;
 621                 }
 622
 623         }
 624
 625         return count;
 626 }
 627
 628 static const struct file_operations ntb_perf_debugfs_run = {
 629         .owner = THIS_MODULE,
 630         .open = simple_open,
 631         .read = debugfs_run_read,
 632         .write = debugfs_run_write,
 633 };
 634
 635 static int perf_debugfs_setup(struct perf_ctx *perf)
 636 {
 637         struct pci_dev *pdev = perf->ntb->pdev;
 638
 639         if (!debugfs_initialized())
 640                 return -ENODEV;
 641
 642         if (!perf_debugfs_dir) {
 643                 perf_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 644                 if (!perf_debugfs_dir)
 645                         return -ENODEV;
 646         }
 647
 648         perf->debugfs_node_dir = debugfs_create_dir(pci_name(pdev),
 649                                                     perf_debugfs_dir);
 650         if (!perf->debugfs_node_dir)
 651                 return -ENODEV;
 652
 653         perf->debugfs_run = debugfs_create_file("run", S_IRUSR | S_IWUSR,
 654                                                 perf->debugfs_node_dir, perf,
 655                                                 &ntb_perf_debugfs_run);
 656         if (!perf->debugfs_run)
 657                 return -ENODEV;
 658
 659         perf->debugfs_threads = debugfs_create_u8("threads", S_IRUSR | S_IWUSR,
 660                                                   perf->debugfs_node_dir,
 661                                                   &perf->perf_threads);
 662         if (!perf->debugfs_threads)
 663                 return -ENODEV;
 664
 665         return 0;
 666 }
 667
 668 static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
 669 {
 670         struct pci_dev *pdev = ntb->pdev;
 671         struct perf_ctx *perf;
 672         int node;
 673         int rc = 0;
 674
 675         node = dev_to_node(&pdev->dev);
 676
 677         perf = kzalloc_node(sizeof(*perf), GFP_KERNEL, node);
 678         if (!perf) {
 679                 rc = -ENOMEM;
 680                 goto err_perf;
 681         }
 682
 683         perf->ntb = ntb;
 684         perf->perf_threads = 1;
 685         atomic_set(&perf->tsync, 0);
 686         perf->run = false;
 687         spin_lock_init(&perf->db_lock);
 688         perf_setup_mw(ntb, perf);
 689         INIT_DELAYED_WORK(&perf->link_work, perf_link_work);
 690         INIT_WORK(&perf->link_cleanup, perf_link_cleanup);
 691
 692         rc = ntb_set_ctx(ntb, perf, &perf_ops);
 693         if (rc)
 694                 goto err_ctx;
 695
 696         perf->link_is_up = false;
 697         ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
 698         ntb_link_event(ntb);
 699
 700         rc = perf_debugfs_setup(perf);
 701         if (rc)
 702                 goto err_ctx;
 703
 704         return 0;
 705
 706 err_ctx:
 707         cancel_delayed_work_sync(&perf->link_work);
 708         cancel_work_sync(&perf->link_cleanup);
 709         kfree(perf);
 710 err_perf:
 711         return rc;
 712 }
 713
 714 static void perf_remove(struct ntb_client *client, struct ntb_dev *ntb)
 715 {
 716         struct perf_ctx *perf = ntb->ctx;
 717         int i;
 718
 719         dev_dbg(&perf->ntb->dev, "%s called\n", __func__);
 720
 721         cancel_delayed_work_sync(&perf->link_work);
 722         cancel_work_sync(&perf->link_cleanup);
 723
 724         ntb_clear_ctx(ntb);
 725         ntb_link_disable(ntb);
 726
 727         debugfs_remove_recursive(perf_debugfs_dir);
 728         perf_debugfs_dir = NULL;
 729
 730         if (use_dma) {
 731                 for (i = 0; i < MAX_THREADS; i++) {
 732                         struct pthr_ctx *pctx = &perf->pthr_ctx[i];
 733
 734                         if (pctx->dma_chan)
 735                                 dma_release_channel(pctx->dma_chan);
 736                 }
 737         }
 738
 739         kfree(perf);
 740 }
 741
 742 static struct ntb_client perf_client = {
 743         .ops = {
 744                 .probe = perf_probe,
 745                 .remove = perf_remove,
 746         },
 747 };
 748 module_ntb_client(perf_client);