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  *   Copyright(c) 2017 T-Platforms. All Rights Reserved.
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of version 2 of the GNU General Public License as
  12  *   published by the Free Software Foundation.
  13  *
  14  *   BSD LICENSE
  15  *
  16  *   Copyright(c) 2015 Intel Corporation. All rights reserved.
  17  *   Copyright(c) 2017 T-Platforms. All Rights Reserved.
  18  *
  19  *   Redistribution and use in source and binary forms, with or without
  20  *   modification, are permitted provided that the following conditions
  21  *   are met:
  22  *
  23  *     * Redistributions of source code must retain the above copyright
  24  *       notice, this list of conditions and the following disclaimer.
  25  *     * Redistributions in binary form must reproduce the above copy
  26  *       notice, this list of conditions and the following disclaimer in
  27  *       the documentation and/or other materials provided with the
  28  *       distribution.
  29  *     * Neither the name of Intel Corporation nor the names of its
  30  *       contributors may be used to endorse or promote products derived
  31  *       from this software without specific prior written permission.
  32  *
  33  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  34  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  35  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  36  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  37  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  38  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  39  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  40  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  41  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  42  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  43  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  44  *
  45  * PCIe NTB Perf Linux driver
  46  */
  47
  48 /*
  49  * How to use this tool, by example.
  50  *
  51  * Assuming $DBG_DIR is something like:
  52  * '/sys/kernel/debug/ntb_perf/0000:00:03.0'
  53  * Suppose aside from local device there is at least one remote device
  54  * connected to NTB with index 0.
  55  *-----------------------------------------------------------------------------
  56  * Eg: install driver with specified chunk/total orders and dma-enabled flag
  57  *
  58  * root@self# insmod ntb_perf.ko chunk_order=19 total_order=28 use_dma
  59  *-----------------------------------------------------------------------------
  60  * Eg: check NTB ports (index) and MW mapping information
  61  *
  62  * root@self# cat $DBG_DIR/info
  63  *-----------------------------------------------------------------------------
  64  * Eg: start performance test with peer (index 0) and get the test metrics
  65  *
  66  * root@self# echo 0 > $DBG_DIR/run
  67  * root@self# cat $DBG_DIR/run
  68  */
  69
  70 #include <linux/init.h>
  71 #include <linux/kernel.h>
  72 #include <linux/module.h>
  73 #include <linux/sched.h>
  74 #include <linux/wait.h>
  75 #include <linux/dma-mapping.h>
  76 #include <linux/dmaengine.h>
  77 #include <linux/pci.h>
  78 #include <linux/ktime.h>
  79 #include <linux/slab.h>
  80 #include <linux/delay.h>
  81 #include <linux/sizes.h>
  82 #include <linux/workqueue.h>
  83 #include <linux/debugfs.h>
  84 #include <linux/random.h>
  85 #include <linux/ntb.h>
  86
  87 #define DRIVER_NAME             "ntb_perf"
  88 #define DRIVER_VERSION          "2.0"
  89
  90 MODULE_LICENSE("Dual BSD/GPL");
  91 MODULE_VERSION(DRIVER_VERSION);
  92 MODULE_AUTHOR("Dave Jiang <dave.jiang@intel.com>");
  93 MODULE_DESCRIPTION("PCIe NTB Performance Measurement Tool");
  94
  95 #define MAX_THREADS_CNT         32
  96 #define DEF_THREADS_CNT         1
  97 #define MAX_CHUNK_SIZE          SZ_1M
  98 #define MAX_CHUNK_ORDER         20 /* no larger than 1M */
  99
 100 #define DMA_TRIES               100
 101 #define DMA_MDELAY              10
 102
 103 #define MSG_TRIES               500
 104 #define MSG_UDELAY_LOW          1000
 105 #define MSG_UDELAY_HIGH         2000
 106
 107 #define PERF_BUF_LEN 1024
 108
 109 static unsigned long max_mw_size;
 110 module_param(max_mw_size, ulong, 0644);
 111 MODULE_PARM_DESC(max_mw_size, "Upper limit of memory window size");
 112
 113 static unsigned char chunk_order = 19; /* 512K */
 114 module_param(chunk_order, byte, 0644);
 115 MODULE_PARM_DESC(chunk_order, "Data chunk order [2^n] to transfer");
 116
 117 static unsigned char total_order = 30; /* 1G */
 118 module_param(total_order, byte, 0644);
 119 MODULE_PARM_DESC(total_order, "Total data order [2^n] to transfer");
 120
 121 static bool use_dma; /* default to 0 */
 122 module_param(use_dma, bool, 0644);
 123 MODULE_PARM_DESC(use_dma, "Use DMA engine to measure performance");
 124
 125 /*==============================================================================
 126  *                         Perf driver data definition
 127  *==============================================================================
 128  */
 129
 130 enum perf_cmd {
 131         PERF_CMD_INVAL = -1,/* invalid spad command */
 132         PERF_CMD_SSIZE = 0, /* send out buffer size */
 133         PERF_CMD_RSIZE = 1, /* recv in  buffer size */
 134         PERF_CMD_SXLAT = 2, /* send in  buffer xlat */
 135         PERF_CMD_RXLAT = 3, /* recv out buffer xlat */
 136         PERF_CMD_CLEAR = 4, /* clear allocated memory */
 137         PERF_STS_DONE  = 5, /* init is done */
 138         PERF_STS_LNKUP = 6, /* link up state flag */
 139 };
 140
 141 struct perf_ctx;
 142
 143 struct perf_peer {
 144         struct perf_ctx *perf;
 145         int pidx;
 146         int gidx;
 147
 148         /* Outbound MW params */
 149         u64 outbuf_xlat;
 150         resource_size_t outbuf_size;
 151         void __iomem *outbuf;
 152
 153         /* Inbound MW params */
 154         dma_addr_t inbuf_xlat;
 155         resource_size_t inbuf_size;
 156         void            *inbuf;
 157
 158         /* NTB connection setup service */
 159         struct work_struct      service;
 160         unsigned long           sts;
 161 };
 162 #define to_peer_service(__work) \
 163         container_of(__work, struct perf_peer, service)
 164
 165 struct perf_thread {
 166         struct perf_ctx *perf;
 167         int tidx;
 168
 169         /* DMA-based test sync parameters */
 170         atomic_t dma_sync;
 171         wait_queue_head_t dma_wait;
 172         struct dma_chan *dma_chan;
 173
 174         /* Data source and measured statistics */
 175         void *src;
 176         u64 copied;
 177         ktime_t duration;
 178         int status;
 179         struct work_struct work;
 180 };
 181 #define to_thread_work(__work) \
 182         container_of(__work, struct perf_thread, work)
 183
 184 struct perf_ctx {
 185         struct ntb_dev *ntb;
 186
 187         /* Global device index and peers descriptors */
 188         int gidx;
 189         int pcnt;
 190         struct perf_peer *peers;
 191
 192         /* Performance measuring work-threads interface */
 193         unsigned long busy_flag;
 194         wait_queue_head_t twait;
 195         atomic_t tsync;
 196         u8 tcnt;
 197         struct perf_peer *test_peer;
 198         struct perf_thread threads[MAX_THREADS_CNT];
 199
 200         /* Scratchpad/Message IO operations */
 201         int (*cmd_send)(struct perf_peer *peer, enum perf_cmd cmd, u64 data);
 202         int (*cmd_recv)(struct perf_ctx *perf, int *pidx, enum perf_cmd *cmd,
 203                         u64 *data);
 204
 205         struct dentry *dbgfs_dir;
 206 };
 207
 208 /*
 209  * Scratchpads-base commands interface
 210  */
 211 #define PERF_SPAD_CNT(_pcnt) \
 212         (3*((_pcnt) + 1))
 213 #define PERF_SPAD_CMD(_gidx) \
 214         (3*(_gidx))
 215 #define PERF_SPAD_LDATA(_gidx) \
 216         (3*(_gidx) + 1)
 217 #define PERF_SPAD_HDATA(_gidx) \
 218         (3*(_gidx) + 2)
 219 #define PERF_SPAD_NOTIFY(_gidx) \
 220         (BIT_ULL(_gidx))
 221
 222 /*
 223  * Messages-base commands interface
 224  */
 225 #define PERF_MSG_CNT            3
 226 #define PERF_MSG_CMD            0
 227 #define PERF_MSG_LDATA          1
 228 #define PERF_MSG_HDATA          2
 229
 230 /*==============================================================================
 231  *                           Static data declarations
 232  *==============================================================================
 233  */
 234
 235 static struct dentry *perf_dbgfs_topdir;
 236
 237 static struct workqueue_struct *perf_wq __read_mostly;
 238
 239 /*==============================================================================
 240  *                  NTB cross-link commands execution service
 241  *==============================================================================
 242  */
 243
 244 static void perf_terminate_test(struct perf_ctx *perf);
 245
 246 static inline bool perf_link_is_up(struct perf_peer *peer)
 247 {
 248         u64 link;
 249
 250         link = ntb_link_is_up(peer->perf->ntb, NULL, NULL);
 251         return !!(link & BIT_ULL_MASK(peer->pidx));
 252 }
 253
 254 static int perf_spad_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
 255                               u64 data)
 256 {
 257         struct perf_ctx *perf = peer->perf;
 258         int try;
 259         u32 sts;
 260
 261         dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data);
 262
 263         /*
 264          * Perform predefined number of attempts before give up.
 265          * We are sending the data to the port specific scratchpad, so
 266          * to prevent a multi-port access race-condition. Additionally
 267          * there is no need in local locking since only thread-safe
 268          * service work is using this method.
 269          */
 270         for (try = 0; try < MSG_TRIES; try++) {
 271                 if (!perf_link_is_up(peer))
 272                         return -ENOLINK;
 273
 274                 sts = ntb_peer_spad_read(perf->ntb, peer->pidx,
 275                                          PERF_SPAD_CMD(perf->gidx));
 276                 if (sts != PERF_CMD_INVAL) {
 277                         usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
 278                         continue;
 279                 }
 280
 281                 ntb_peer_spad_write(perf->ntb, peer->pidx,
 282                                     PERF_SPAD_LDATA(perf->gidx),
 283                                     lower_32_bits(data));
 284                 ntb_peer_spad_write(perf->ntb, peer->pidx,
 285                                     PERF_SPAD_HDATA(perf->gidx),
 286                                     upper_32_bits(data));
 287                 mmiowb();
 288                 ntb_peer_spad_write(perf->ntb, peer->pidx,
 289                                     PERF_SPAD_CMD(perf->gidx),
 290                                     cmd);
 291                 mmiowb();
 292                 ntb_peer_db_set(perf->ntb, PERF_SPAD_NOTIFY(peer->gidx));
 293
 294                 dev_dbg(&perf->ntb->dev, "DB ring peer %#llx\n",
 295                         PERF_SPAD_NOTIFY(peer->gidx));
 296
 297                 break;
 298         }
 299
 300         return try < MSG_TRIES ? 0 : -EAGAIN;
 301 }
 302
 303 static int perf_spad_cmd_recv(struct perf_ctx *perf, int *pidx,
 304                               enum perf_cmd *cmd, u64 *data)
 305 {
 306         struct perf_peer *peer;
 307         u32 val;
 308
 309         ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
 310
 311         /*
 312          * We start scanning all over, since cleared DB may have been set
 313          * by any peer. Yes, it makes peer with smaller index being
 314          * serviced with greater priority, but it's convenient for spad
 315          * and message code unification and simplicity.
 316          */
 317         for (*pidx = 0; *pidx < perf->pcnt; (*pidx)++) {
 318                 peer = &perf->peers[*pidx];
 319
 320                 if (!perf_link_is_up(peer))
 321                         continue;
 322
 323                 val = ntb_spad_read(perf->ntb, PERF_SPAD_CMD(peer->gidx));
 324                 if (val == PERF_CMD_INVAL)
 325                         continue;
 326
 327                 *cmd = val;
 328
 329                 val = ntb_spad_read(perf->ntb, PERF_SPAD_LDATA(peer->gidx));
 330                 *data = val;
 331
 332                 val = ntb_spad_read(perf->ntb, PERF_SPAD_HDATA(peer->gidx));
 333                 *data |= (u64)val << 32;
 334
 335                 /* Next command can be retrieved from now */
 336                 ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx),
 337                                PERF_CMD_INVAL);
 338
 339                 dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data);
 340
 341                 return 0;
 342         }
 343
 344         return -ENODATA;
 345 }
 346
 347 static int perf_msg_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
 348                              u64 data)
 349 {
 350         struct perf_ctx *perf = peer->perf;
 351         int try, ret;
 352         u64 outbits;
 353
 354         dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data);
 355
 356         /*
 357          * Perform predefined number of attempts before give up. Message
 358          * registers are free of race-condition problem when accessed
 359          * from different ports, so we don't need splitting registers
 360          * by global device index. We also won't have local locking,
 361          * since the method is used from service work only.
 362          */
 363         outbits = ntb_msg_outbits(perf->ntb);
 364         for (try = 0; try < MSG_TRIES; try++) {
 365                 if (!perf_link_is_up(peer))
 366                         return -ENOLINK;
 367
 368                 ret = ntb_msg_clear_sts(perf->ntb, outbits);
 369                 if (ret)
 370                         return ret;
 371
 372                 ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_LDATA,
 373                                    lower_32_bits(data));
 374
 375                 if (ntb_msg_read_sts(perf->ntb) & outbits) {
 376                         usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH);
 377                         continue;
 378                 }
 379
 380                 ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_HDATA,
 381                                    upper_32_bits(data));
 382                 mmiowb();
 383
 384                 /* This call shall trigger peer message event */
 385                 ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_CMD, cmd);
 386
 387                 break;
 388         }
 389
 390         return try < MSG_TRIES ? 0 : -EAGAIN;
 391 }
 392
 393 static int perf_msg_cmd_recv(struct perf_ctx *perf, int *pidx,
 394                              enum perf_cmd *cmd, u64 *data)
 395 {
 396         u64 inbits;
 397         u32 val;
 398
 399         inbits = ntb_msg_inbits(perf->ntb);
 400
 401         if (hweight64(ntb_msg_read_sts(perf->ntb) & inbits) < 3)
 402                 return -ENODATA;
 403
 404         val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_CMD);
 405         *cmd = val;
 406
 407         val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_LDATA);
 408         *data = val;
 409
 410         val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_HDATA);
 411         *data |= (u64)val << 32;
 412
 413         /* Next command can be retrieved from now */
 414         ntb_msg_clear_sts(perf->ntb, inbits);
 415
 416         dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data);
 417
 418         return 0;
 419 }
 420
 421 static int perf_cmd_send(struct perf_peer *peer, enum perf_cmd cmd, u64 data)
 422 {
 423         struct perf_ctx *perf = peer->perf;
 424
 425         if (cmd == PERF_CMD_SSIZE || cmd == PERF_CMD_SXLAT)
 426                 return perf->cmd_send(peer, cmd, data);
 427
 428         dev_err(&perf->ntb->dev, "Send invalid command\n");
 429         return -EINVAL;
 430 }
 431
 432 static int perf_cmd_exec(struct perf_peer *peer, enum perf_cmd cmd)
 433 {
 434         switch (cmd) {
 435         case PERF_CMD_SSIZE:
 436         case PERF_CMD_RSIZE:
 437         case PERF_CMD_SXLAT:
 438         case PERF_CMD_RXLAT:
 439         case PERF_CMD_CLEAR:
 440                 break;
 441         default:
 442                 dev_err(&peer->perf->ntb->dev, "Exec invalid command\n");
 443                 return -EINVAL;
 444         }
 445
 446         /* No need of memory barrier, since bit ops have invernal lock */
 447         set_bit(cmd, &peer->sts);
 448
 449         dev_dbg(&peer->perf->ntb->dev, "CMD exec: %d\n", cmd);
 450
 451         (void)queue_work(system_highpri_wq, &peer->service);
 452
 453         return 0;
 454 }
 455
 456 static int perf_cmd_recv(struct perf_ctx *perf)
 457 {
 458         struct perf_peer *peer;
 459         int ret, pidx, cmd;
 460         u64 data;
 461
 462         while (!(ret = perf->cmd_recv(perf, &pidx, &cmd, &data))) {
 463                 peer = &perf->peers[pidx];
 464
 465                 switch (cmd) {
 466                 case PERF_CMD_SSIZE:
 467                         peer->inbuf_size = data;
 468                         return perf_cmd_exec(peer, PERF_CMD_RSIZE);
 469                 case PERF_CMD_SXLAT:
 470                         peer->outbuf_xlat = data;
 471                         return perf_cmd_exec(peer, PERF_CMD_RXLAT);
 472                 default:
 473                         dev_err(&perf->ntb->dev, "Recv invalid command\n");
 474                         return -EINVAL;
 475                 }
 476         }
 477
 478         /* Return 0 if no data left to process, otherwise an error */
 479         return ret == -ENODATA ? 0 : ret;
 480 }
 481
 482 static void perf_link_event(void *ctx)
 483 {
 484         struct perf_ctx *perf = ctx;
 485         struct perf_peer *peer;
 486         bool lnk_up;
 487         int pidx;
 488
 489         for (pidx = 0; pidx < perf->pcnt; pidx++) {
 490                 peer = &perf->peers[pidx];
 491
 492                 lnk_up = perf_link_is_up(peer);
 493
 494                 if (lnk_up &&
 495                     !test_and_set_bit(PERF_STS_LNKUP, &peer->sts)) {
 496                         perf_cmd_exec(peer, PERF_CMD_SSIZE);
 497                 } else if (!lnk_up &&
 498                            test_and_clear_bit(PERF_STS_LNKUP, &peer->sts)) {
 499                         perf_cmd_exec(peer, PERF_CMD_CLEAR);
 500                 }
 501         }
 502 }
 503
 504 static void perf_db_event(void *ctx, int vec)
 505 {
 506         struct perf_ctx *perf = ctx;
 507
 508         dev_dbg(&perf->ntb->dev, "DB vec %d mask %#llx bits %#llx\n", vec,
 509                 ntb_db_vector_mask(perf->ntb, vec), ntb_db_read(perf->ntb));
 510
 511         /* Just receive all available commands */
 512         (void)perf_cmd_recv(perf);
 513 }
 514
 515 static void perf_msg_event(void *ctx)
 516 {
 517         struct perf_ctx *perf = ctx;
 518
 519         dev_dbg(&perf->ntb->dev, "Msg status bits %#llx\n",
 520                 ntb_msg_read_sts(perf->ntb));
 521
 522         /* Messages are only sent one-by-one */
 523         (void)perf_cmd_recv(perf);
 524 }
 525
 526 static const struct ntb_ctx_ops perf_ops = {
 527         .link_event = perf_link_event,
 528         .db_event = perf_db_event,
 529         .msg_event = perf_msg_event
 530 };
 531
 532 static void perf_free_outbuf(struct perf_peer *peer)
 533 {
 534         (void)ntb_peer_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
 535 }
 536
 537 static int perf_setup_outbuf(struct perf_peer *peer)
 538 {
 539         struct perf_ctx *perf = peer->perf;
 540         int ret;
 541
 542         /* Outbuf size can be unaligned due to custom max_mw_size */
 543         ret = ntb_peer_mw_set_trans(perf->ntb, peer->pidx, peer->gidx,
 544                                     peer->outbuf_xlat, peer->outbuf_size);
 545         if (ret) {
 546                 dev_err(&perf->ntb->dev, "Failed to set outbuf translation\n");
 547                 return ret;
 548         }
 549
 550         /* Initialization is finally done */
 551         set_bit(PERF_STS_DONE, &peer->sts);
 552
 553         return 0;
 554 }
 555
 556 static void perf_free_inbuf(struct perf_peer *peer)
 557 {
 558         if (!peer->inbuf)
 559                 return;
 560
 561         (void)ntb_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx);
 562         dma_free_coherent(&peer->perf->ntb->dev, peer->inbuf_size,
 563                           peer->inbuf, peer->inbuf_xlat);
 564         peer->inbuf = NULL;
 565 }
 566
 567 static int perf_setup_inbuf(struct perf_peer *peer)
 568 {
 569         resource_size_t xlat_align, size_align, size_max;
 570         struct perf_ctx *perf = peer->perf;
 571         int ret;
 572
 573         /* Get inbound MW parameters */
 574         ret = ntb_mw_get_align(perf->ntb, peer->pidx, perf->gidx,
 575                                &xlat_align, &size_align, &size_max);
 576         if (ret) {
 577                 dev_err(&perf->ntb->dev, "Couldn't get inbuf restrictions\n");
 578                 return ret;
 579         }
 580
 581         if (peer->inbuf_size > size_max) {
 582                 dev_err(&perf->ntb->dev, "Too big inbuf size %pa > %pa\n",
 583                         &peer->inbuf_size, &size_max);
 584                 return -EINVAL;
 585         }
 586
 587         peer->inbuf_size = round_up(peer->inbuf_size, size_align);
 588
 589         perf_free_inbuf(peer);
 590
 591         peer->inbuf = dma_alloc_coherent(&perf->ntb->dev, peer->inbuf_size,
 592                                          &peer->inbuf_xlat, GFP_KERNEL);
 593         if (!peer->inbuf) {
 594                 dev_err(&perf->ntb->dev, "Failed to alloc inbuf of %pa\n",
 595                         &peer->inbuf_size);
 596                 return -ENOMEM;
 597         }
 598         if (!IS_ALIGNED(peer->inbuf_xlat, xlat_align)) {
 599                 dev_err(&perf->ntb->dev, "Unaligned inbuf allocated\n");
 600                 goto err_free_inbuf;
 601         }
 602
 603         ret = ntb_mw_set_trans(perf->ntb, peer->pidx, peer->gidx,
 604                                peer->inbuf_xlat, peer->inbuf_size);
 605         if (ret) {
 606                 dev_err(&perf->ntb->dev, "Failed to set inbuf translation\n");
 607                 goto err_free_inbuf;
 608         }
 609
 610         /*
 611          * We submit inbuf xlat transmission cmd for execution here to follow
 612          * the code architecture, even though this method is called from service
 613          * work itself so the command will be executed right after it returns.
 614          */
 615         (void)perf_cmd_exec(peer, PERF_CMD_SXLAT);
 616
 617         return 0;
 618
 619 err_free_inbuf:
 620         perf_free_inbuf(peer);
 621
 622         return ret;
 623 }
 624
 625 static void perf_service_work(struct work_struct *work)
 626 {
 627         struct perf_peer *peer = to_peer_service(work);
 628
 629         if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts))
 630                 perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size);
 631
 632         if (test_and_clear_bit(PERF_CMD_RSIZE, &peer->sts))
 633                 perf_setup_inbuf(peer);
 634
 635         if (test_and_clear_bit(PERF_CMD_SXLAT, &peer->sts))
 636                 perf_cmd_send(peer, PERF_CMD_SXLAT, peer->inbuf_xlat);
 637
 638         if (test_and_clear_bit(PERF_CMD_RXLAT, &peer->sts))
 639                 perf_setup_outbuf(peer);
 640
 641         if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) {
 642                 clear_bit(PERF_STS_DONE, &peer->sts);
 643                 if (test_bit(0, &peer->perf->busy_flag) &&
 644                     peer == peer->perf->test_peer) {
 645                         dev_warn(&peer->perf->ntb->dev,
 646                                 "Freeing while test on-fly\n");
 647                         perf_terminate_test(peer->perf);
 648                 }
 649                 perf_free_outbuf(peer);
 650                 perf_free_inbuf(peer);
 651         }
 652 }
 653
 654 static int perf_init_service(struct perf_ctx *perf)
 655 {
 656         u64 mask;
 657
 658         if (ntb_peer_mw_count(perf->ntb) < perf->pcnt + 1) {
 659                 dev_err(&perf->ntb->dev, "Not enough memory windows\n");
 660                 return -EINVAL;
 661         }
 662
 663         if (ntb_msg_count(perf->ntb) >= PERF_MSG_CNT) {
 664                 perf->cmd_send = perf_msg_cmd_send;
 665                 perf->cmd_recv = perf_msg_cmd_recv;
 666
 667                 dev_dbg(&perf->ntb->dev, "Message service initialized\n");
 668
 669                 return 0;
 670         }
 671
 672         dev_dbg(&perf->ntb->dev, "Message service unsupported\n");
 673
 674         mask = GENMASK_ULL(perf->pcnt, 0);
 675         if (ntb_spad_count(perf->ntb) >= PERF_SPAD_CNT(perf->pcnt) &&
 676             (ntb_db_valid_mask(perf->ntb) & mask) == mask) {
 677                 perf->cmd_send = perf_spad_cmd_send;
 678                 perf->cmd_recv = perf_spad_cmd_recv;
 679
 680                 dev_dbg(&perf->ntb->dev, "Scratchpad service initialized\n");
 681
 682                 return 0;
 683         }
 684
 685         dev_dbg(&perf->ntb->dev, "Scratchpad service unsupported\n");
 686
 687         dev_err(&perf->ntb->dev, "Command services unsupported\n");
 688
 689         return -EINVAL;
 690 }
 691
 692 static int perf_enable_service(struct perf_ctx *perf)
 693 {
 694         u64 mask, incmd_bit;
 695         int ret, sidx, scnt;
 696
 697         mask = ntb_db_valid_mask(perf->ntb);
 698         (void)ntb_db_set_mask(perf->ntb, mask);
 699
 700         ret = ntb_set_ctx(perf->ntb, perf, &perf_ops);
 701         if (ret)
 702                 return ret;
 703
 704         if (perf->cmd_send == perf_msg_cmd_send) {
 705                 u64 inbits, outbits;
 706
 707                 inbits = ntb_msg_inbits(perf->ntb);
 708                 outbits = ntb_msg_outbits(perf->ntb);
 709                 (void)ntb_msg_set_mask(perf->ntb, inbits | outbits);
 710
 711                 incmd_bit = BIT_ULL(__ffs64(inbits));
 712                 ret = ntb_msg_clear_mask(perf->ntb, incmd_bit);
 713
 714                 dev_dbg(&perf->ntb->dev, "MSG sts unmasked %#llx\n", incmd_bit);
 715         } else {
 716                 scnt = ntb_spad_count(perf->ntb);
 717                 for (sidx = 0; sidx < scnt; sidx++)
 718                         ntb_spad_write(perf->ntb, sidx, PERF_CMD_INVAL);
 719                 incmd_bit = PERF_SPAD_NOTIFY(perf->gidx);
 720                 ret = ntb_db_clear_mask(perf->ntb, incmd_bit);
 721
 722                 dev_dbg(&perf->ntb->dev, "DB bits unmasked %#llx\n", incmd_bit);
 723         }
 724         if (ret) {
 725                 ntb_clear_ctx(perf->ntb);
 726                 return ret;
 727         }
 728
 729         ntb_link_enable(perf->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
 730         /* Might be not necessary */
 731         ntb_link_event(perf->ntb);
 732
 733         return 0;
 734 }
 735
 736 static void perf_disable_service(struct perf_ctx *perf)
 737 {
 738         int pidx;
 739
 740         ntb_link_disable(perf->ntb);
 741
 742         if (perf->cmd_send == perf_msg_cmd_send) {
 743                 u64 inbits;
 744
 745                 inbits = ntb_msg_inbits(perf->ntb);
 746                 (void)ntb_msg_set_mask(perf->ntb, inbits);
 747         } else {
 748                 (void)ntb_db_set_mask(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx));
 749         }
 750
 751         ntb_clear_ctx(perf->ntb);
 752
 753         for (pidx = 0; pidx < perf->pcnt; pidx++)
 754                 perf_cmd_exec(&perf->peers[pidx], PERF_CMD_CLEAR);
 755
 756         for (pidx = 0; pidx < perf->pcnt; pidx++)
 757                 flush_work(&perf->peers[pidx].service);
 758 }
 759
 760 /*==============================================================================
 761  *                      Performance measuring work-thread
 762  *==============================================================================
 763  */
 764
 765 static void perf_dma_copy_callback(void *data)
 766 {
 767         struct perf_thread *pthr = data;
 768
 769         atomic_dec(&pthr->dma_sync);
 770         wake_up(&pthr->dma_wait);
 771 }
 772
 773 static int perf_copy_chunk(struct perf_thread *pthr,
 774                            void __iomem *dst, void *src, size_t len)
 775 {
 776         struct dma_async_tx_descriptor *tx;
 777         struct dmaengine_unmap_data *unmap;
 778         struct device *dma_dev;
 779         int try = 0, ret = 0;
 780
 781         if (!use_dma) {
 782                 memcpy_toio(dst, src, len);
 783                 goto ret_check_tsync;
 784         }
 785
 786         dma_dev = pthr->dma_chan->device->dev;
 787
 788         if (!is_dma_copy_aligned(pthr->dma_chan->device, offset_in_page(src),
 789                                  offset_in_page(dst), len))
 790                 return -EIO;
 791
 792         unmap = dmaengine_get_unmap_data(dma_dev, 2, GFP_NOWAIT);
 793         if (!unmap)
 794                 return -ENOMEM;
 795
 796         unmap->len = len;
 797         unmap->addr[0] = dma_map_page(dma_dev, virt_to_page(src),
 798                 offset_in_page(src), len, DMA_TO_DEVICE);
 799         if (dma_mapping_error(dma_dev, unmap->addr[0])) {
 800                 ret = -EIO;
 801                 goto err_free_resource;
 802         }
 803         unmap->to_cnt = 1;
 804
 805         unmap->addr[1] = dma_map_page(dma_dev, virt_to_page(dst),
 806                 offset_in_page(dst), len, DMA_FROM_DEVICE);
 807         if (dma_mapping_error(dma_dev, unmap->addr[1])) {
 808                 ret = -EIO;
 809                 goto err_free_resource;
 810         }
 811         unmap->from_cnt = 1;
 812
 813         do {
 814                 tx = dmaengine_prep_dma_memcpy(pthr->dma_chan, unmap->addr[1],
 815                         unmap->addr[0], len, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 816                 if (!tx)
 817                         msleep(DMA_MDELAY);
 818         } while (!tx && (try++ < DMA_TRIES));
 819
 820         if (!tx) {
 821                 ret = -EIO;
 822                 goto err_free_resource;
 823         }
 824
 825         tx->callback = perf_dma_copy_callback;
 826         tx->callback_param = pthr;
 827         dma_set_unmap(tx, unmap);
 828
 829         ret = dma_submit_error(dmaengine_submit(tx));
 830         if (ret) {
 831                 dmaengine_unmap_put(unmap);
 832                 goto err_free_resource;
 833         }
 834
 835         dmaengine_unmap_put(unmap);
 836
 837         atomic_inc(&pthr->dma_sync);
 838         dma_async_issue_pending(pthr->dma_chan);
 839
 840 ret_check_tsync:
 841         return likely(atomic_read(&pthr->perf->tsync) > 0) ? 0 : -EINTR;
 842
 843 err_free_resource:
 844         dmaengine_unmap_put(unmap);
 845
 846         return ret;
 847 }
 848
 849 static bool perf_dma_filter(struct dma_chan *chan, void *data)
 850 {
 851         struct perf_ctx *perf = data;
 852         int node;
 853
 854         node = dev_to_node(&perf->ntb->dev);
 855
 856         return node == NUMA_NO_NODE || node == dev_to_node(chan->device->dev);
 857 }
 858
 859 static int perf_init_test(struct perf_thread *pthr)
 860 {
 861         struct perf_ctx *perf = pthr->perf;
 862         dma_cap_mask_t dma_mask;
 863
 864         pthr->src = kmalloc_node(perf->test_peer->outbuf_size, GFP_KERNEL,
 865                                  dev_to_node(&perf->ntb->dev));
 866         if (!pthr->src)
 867                 return -ENOMEM;
 868
 869         get_random_bytes(pthr->src, perf->test_peer->outbuf_size);
 870
 871         if (!use_dma)
 872                 return 0;
 873
 874         dma_cap_zero(dma_mask);
 875         dma_cap_set(DMA_MEMCPY, dma_mask);
 876         pthr->dma_chan = dma_request_channel(dma_mask, perf_dma_filter, perf);
 877         if (!pthr->dma_chan) {
 878                 dev_err(&perf->ntb->dev, "%d: Failed to get DMA channel\n",
 879                         pthr->tidx);
 880                 atomic_dec(&perf->tsync);
 881                 wake_up(&perf->twait);
 882                 kfree(pthr->src);
 883                 return -ENODEV;
 884         }
 885
 886         atomic_set(&pthr->dma_sync, 0);
 887
 888         return 0;
 889 }
 890
 891 static int perf_run_test(struct perf_thread *pthr)
 892 {
 893         struct perf_peer *peer = pthr->perf->test_peer;
 894         struct perf_ctx *perf = pthr->perf;
 895         void __iomem *flt_dst, *bnd_dst;
 896         u64 total_size, chunk_size;
 897         void *flt_src;
 898         int ret = 0;
 899
 900         total_size = 1ULL << total_order;
 901         chunk_size = 1ULL << chunk_order;
 902         chunk_size = min_t(u64, peer->outbuf_size, chunk_size);
 903
 904         flt_src = pthr->src;
 905         bnd_dst = peer->outbuf + peer->outbuf_size;
 906         flt_dst = peer->outbuf;
 907
 908         pthr->duration = ktime_get();
 909
 910         /* Copied field is cleared on test launch stage */
 911         while (pthr->copied < total_size) {
 912                 ret = perf_copy_chunk(pthr, flt_dst, flt_src, chunk_size);
 913                 if (ret) {
 914                         dev_err(&perf->ntb->dev, "%d: Got error %d on test\n",
 915                                 pthr->tidx, ret);
 916                         return ret;
 917                 }
 918
 919                 pthr->copied += chunk_size;
 920
 921                 flt_dst += chunk_size;
 922                 flt_src += chunk_size;
 923                 if (flt_dst >= bnd_dst || flt_dst < peer->outbuf) {
 924                         flt_dst = peer->outbuf;
 925                         flt_src = pthr->src;
 926                 }
 927
 928                 /* Give up CPU to give a chance for other threads to use it */
 929                 schedule();
 930         }
 931
 932         return 0;
 933 }
 934
 935 static int perf_sync_test(struct perf_thread *pthr)
 936 {
 937         struct perf_ctx *perf = pthr->perf;
 938
 939         if (!use_dma)
 940                 goto no_dma_ret;
 941
 942         wait_event(pthr->dma_wait,
 943                    (atomic_read(&pthr->dma_sync) == 0 ||
 944                     atomic_read(&perf->tsync) < 0));
 945
 946         if (atomic_read(&perf->tsync) < 0)
 947                 return -EINTR;
 948
 949 no_dma_ret:
 950         pthr->duration = ktime_sub(ktime_get(), pthr->duration);
 951
 952         dev_dbg(&perf->ntb->dev, "%d: copied %llu bytes\n",
 953                 pthr->tidx, pthr->copied);
 954
 955         dev_dbg(&perf->ntb->dev, "%d: lasted %llu usecs\n",
 956                 pthr->tidx, ktime_to_us(pthr->duration));
 957
 958         dev_dbg(&perf->ntb->dev, "%d: %llu MBytes/s\n", pthr->tidx,
 959                 div64_u64(pthr->copied, ktime_to_us(pthr->duration)));
 960
 961         return 0;
 962 }
 963
 964 static void perf_clear_test(struct perf_thread *pthr)
 965 {
 966         struct perf_ctx *perf = pthr->perf;
 967
 968         if (!use_dma)
 969                 goto no_dma_notify;
 970
 971         /*
 972          * If test finished without errors, termination isn't needed.
 973          * We call it anyway just to be sure of the transfers completion.
 974          */
 975         (void)dmaengine_terminate_sync(pthr->dma_chan);
 976
 977         dma_release_channel(pthr->dma_chan);
 978
 979 no_dma_notify:
 980         atomic_dec(&perf->tsync);
 981         wake_up(&perf->twait);
 982         kfree(pthr->src);
 983 }
 984
 985 static void perf_thread_work(struct work_struct *work)
 986 {
 987         struct perf_thread *pthr = to_thread_work(work);
 988         int ret;
 989
 990         /*
 991          * Perform stages in compliance with use_dma flag value.
 992          * Test status is changed only if error happened, otherwise
 993          * status -ENODATA is kept while test is on-fly. Results
 994          * synchronization is performed only if test fininshed
 995          * without an error or interruption.
 996          */
 997         ret = perf_init_test(pthr);
 998         if (ret) {
 999                 pthr->status = ret;
1000                 return;
1001         }
1002
1003         ret = perf_run_test(pthr);
1004         if (ret) {
1005                 pthr->status = ret;
1006                 goto err_clear_test;
1007         }
1008
1009         pthr->status = perf_sync_test(pthr);
1010
1011 err_clear_test:
1012         perf_clear_test(pthr);
1013 }
1014
1015 static int perf_set_tcnt(struct perf_ctx *perf, u8 tcnt)
1016 {
1017         if (tcnt == 0 || tcnt > MAX_THREADS_CNT)
1018                 return -EINVAL;
1019
1020         if (test_and_set_bit_lock(0, &perf->busy_flag))
1021                 return -EBUSY;
1022
1023         perf->tcnt = tcnt;
1024
1025         clear_bit_unlock(0, &perf->busy_flag);
1026
1027         return 0;
1028 }
1029
1030 static void perf_terminate_test(struct perf_ctx *perf)
1031 {
1032         int tidx;
1033
1034         atomic_set(&perf->tsync, -1);
1035         wake_up(&perf->twait);
1036
1037         for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1038                 wake_up(&perf->threads[tidx].dma_wait);
1039                 cancel_work_sync(&perf->threads[tidx].work);
1040         }
1041 }
1042
1043 static int perf_submit_test(struct perf_peer *peer)
1044 {
1045         struct perf_ctx *perf = peer->perf;
1046         struct perf_thread *pthr;
1047         int tidx, ret;
1048
1049         if (!test_bit(PERF_STS_DONE, &peer->sts))
1050                 return -ENOLINK;
1051
1052         if (test_and_set_bit_lock(0, &perf->busy_flag))
1053                 return -EBUSY;
1054
1055         perf->test_peer = peer;
1056         atomic_set(&perf->tsync, perf->tcnt);
1057
1058         for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1059                 pthr = &perf->threads[tidx];
1060
1061                 pthr->status = -ENODATA;
1062                 pthr->copied = 0;
1063                 pthr->duration = ktime_set(0, 0);
1064                 if (tidx < perf->tcnt)
1065                         (void)queue_work(perf_wq, &pthr->work);
1066         }
1067
1068         ret = wait_event_interruptible(perf->twait,
1069                                        atomic_read(&perf->tsync) <= 0);
1070         if (ret == -ERESTARTSYS) {
1071                 perf_terminate_test(perf);
1072                 ret = -EINTR;
1073         }
1074
1075         clear_bit_unlock(0, &perf->busy_flag);
1076
1077         return ret;
1078 }
1079
1080 static int perf_read_stats(struct perf_ctx *perf, char *buf,
1081                            size_t size, ssize_t *pos)
1082 {
1083         struct perf_thread *pthr;
1084         int tidx;
1085
1086         if (test_and_set_bit_lock(0, &perf->busy_flag))
1087                 return -EBUSY;
1088
1089         (*pos) += scnprintf(buf + *pos, size - *pos,
1090                 "    Peer %d test statistics:\n", perf->test_peer->pidx);
1091
1092         for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1093                 pthr = &perf->threads[tidx];
1094
1095                 if (pthr->status == -ENODATA)
1096                         continue;
1097
1098                 if (pthr->status) {
1099                         (*pos) += scnprintf(buf + *pos, size - *pos,
1100                                 "%d: error status %d\n", tidx, pthr->status);
1101                         continue;
1102                 }
1103
1104                 (*pos) += scnprintf(buf + *pos, size - *pos,
1105                         "%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n",
1106                         tidx, pthr->copied, ktime_to_us(pthr->duration),
1107                         div64_u64(pthr->copied, ktime_to_us(pthr->duration)));
1108         }
1109
1110         clear_bit_unlock(0, &perf->busy_flag);
1111
1112         return 0;
1113 }
1114
1115 static void perf_init_threads(struct perf_ctx *perf)
1116 {
1117         struct perf_thread *pthr;
1118         int tidx;
1119
1120         perf->tcnt = DEF_THREADS_CNT;
1121         perf->test_peer = &perf->peers[0];
1122         init_waitqueue_head(&perf->twait);
1123
1124         for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) {
1125                 pthr = &perf->threads[tidx];
1126
1127                 pthr->perf = perf;
1128                 pthr->tidx = tidx;
1129                 pthr->status = -ENODATA;
1130                 init_waitqueue_head(&pthr->dma_wait);
1131                 INIT_WORK(&pthr->work, perf_thread_work);
1132         }
1133 }
1134
1135 static void perf_clear_threads(struct perf_ctx *perf)
1136 {
1137         perf_terminate_test(perf);
1138 }
1139
1140 /*==============================================================================
1141  *                               DebugFS nodes
1142  *==============================================================================
1143  */
1144
1145 static ssize_t perf_dbgfs_read_info(struct file *filep, char __user *ubuf,
1146                                     size_t size, loff_t *offp)
1147 {
1148         struct perf_ctx *perf = filep->private_data;
1149         struct perf_peer *peer;
1150         size_t buf_size;
1151         ssize_t pos = 0;
1152         int ret, pidx;
1153         char *buf;
1154
1155         buf_size = min_t(size_t, size, 0x1000U);
1156
1157         buf = kmalloc(buf_size, GFP_KERNEL);
1158         if (!buf)
1159                 return -ENOMEM;
1160
1161         pos += scnprintf(buf + pos, buf_size - pos,
1162                 "    Performance measuring tool info:\n\n");
1163
1164         pos += scnprintf(buf + pos, buf_size - pos,
1165                 "Local port %d, Global index %d\n", ntb_port_number(perf->ntb),
1166                 perf->gidx);
1167         pos += scnprintf(buf + pos, buf_size - pos, "Test status: ");
1168         if (test_bit(0, &perf->busy_flag)) {
1169                 pos += scnprintf(buf + pos, buf_size - pos,
1170                         "on-fly with port %d (%d)\n",
1171                         ntb_peer_port_number(perf->ntb, perf->test_peer->pidx),
1172                         perf->test_peer->pidx);
1173         } else {
1174                 pos += scnprintf(buf + pos, buf_size - pos, "idle\n");
1175         }
1176
1177         for (pidx = 0; pidx < perf->pcnt; pidx++) {
1178                 peer = &perf->peers[pidx];
1179
1180                 pos += scnprintf(buf + pos, buf_size - pos,
1181                         "Port %d (%d), Global index %d:\n",
1182                         ntb_peer_port_number(perf->ntb, peer->pidx), peer->pidx,
1183                         peer->gidx);
1184
1185                 pos += scnprintf(buf + pos, buf_size - pos,
1186                         "\tLink status: %s\n",
1187                         test_bit(PERF_STS_LNKUP, &peer->sts) ? "up" : "down");
1188
1189                 pos += scnprintf(buf + pos, buf_size - pos,
1190                         "\tOut buffer addr 0x%pK\n", peer->outbuf);
1191
1192                 pos += scnprintf(buf + pos, buf_size - pos,
1193                         "\tOut buffer size %pa\n", &peer->outbuf_size);
1194
1195                 pos += scnprintf(buf + pos, buf_size - pos,
1196                         "\tOut buffer xlat 0x%016llx[p]\n", peer->outbuf_xlat);
1197
1198                 if (!peer->inbuf) {
1199                         pos += scnprintf(buf + pos, buf_size - pos,
1200                                 "\tIn buffer addr: unallocated\n");
1201                         continue;
1202                 }
1203
1204                 pos += scnprintf(buf + pos, buf_size - pos,
1205                         "\tIn buffer addr 0x%pK\n", peer->inbuf);
1206
1207                 pos += scnprintf(buf + pos, buf_size - pos,
1208                         "\tIn buffer size %pa\n", &peer->inbuf_size);
1209
1210                 pos += scnprintf(buf + pos, buf_size - pos,
1211                         "\tIn buffer xlat %pad[p]\n", &peer->inbuf_xlat);
1212         }
1213
1214         ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
1215         kfree(buf);
1216
1217         return ret;
1218 }
1219
1220 static const struct file_operations perf_dbgfs_info = {
1221         .open = simple_open,
1222         .read = perf_dbgfs_read_info
1223 };
1224
1225 static ssize_t perf_dbgfs_read_run(struct file *filep, char __user *ubuf,
1226                                    size_t size, loff_t *offp)
1227 {
1228         struct perf_ctx *perf = filep->private_data;
1229         ssize_t ret, pos = 0;
1230         char *buf;
1231
1232         buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL);
1233         if (!buf)
1234                 return -ENOMEM;
1235
1236         ret = perf_read_stats(perf, buf, PERF_BUF_LEN, &pos);
1237         if (ret)
1238                 goto err_free;
1239
1240         ret = simple_read_from_buffer(ubuf, size, offp, buf, pos);
1241 err_free:
1242         kfree(buf);
1243
1244         return ret;
1245 }
1246
1247 static ssize_t perf_dbgfs_write_run(struct file *filep, const char __user *ubuf,
1248                                     size_t size, loff_t *offp)
1249 {
1250         struct perf_ctx *perf = filep->private_data;
1251         struct perf_peer *peer;
1252         int pidx, ret;
1253
1254         ret = kstrtoint_from_user(ubuf, size, 0, &pidx);
1255         if (ret)
1256                 return ret;
1257
1258         if (pidx < 0 || pidx >= perf->pcnt)
1259                 return -EINVAL;
1260
1261         peer = &perf->peers[pidx];
1262
1263         ret = perf_submit_test(peer);
1264         if (ret)
1265                 return ret;
1266
1267         return size;
1268 }
1269
1270 static const struct file_operations perf_dbgfs_run = {
1271         .open = simple_open,
1272         .read = perf_dbgfs_read_run,
1273         .write = perf_dbgfs_write_run
1274 };
1275
1276 static ssize_t perf_dbgfs_read_tcnt(struct file *filep, char __user *ubuf,
1277                                     size_t size, loff_t *offp)
1278 {
1279         struct perf_ctx *perf = filep->private_data;
1280         char buf[8];
1281         ssize_t pos;
1282
1283         pos = scnprintf(buf, sizeof(buf), "%hhu\n", perf->tcnt);
1284
1285         return simple_read_from_buffer(ubuf, size, offp, buf, pos);
1286 }
1287
1288 static ssize_t perf_dbgfs_write_tcnt(struct file *filep,
1289                                      const char __user *ubuf,
1290                                      size_t size, loff_t *offp)
1291 {
1292         struct perf_ctx *perf = filep->private_data;
1293         int ret;
1294         u8 val;
1295
1296         ret = kstrtou8_from_user(ubuf, size, 0, &val);
1297         if (ret)
1298                 return ret;
1299
1300         ret = perf_set_tcnt(perf, val);
1301         if (ret)
1302                 return ret;
1303
1304         return size;
1305 }
1306
1307 static const struct file_operations perf_dbgfs_tcnt = {
1308         .open = simple_open,
1309         .read = perf_dbgfs_read_tcnt,
1310         .write = perf_dbgfs_write_tcnt
1311 };
1312
1313 static void perf_setup_dbgfs(struct perf_ctx *perf)
1314 {
1315         struct pci_dev *pdev = perf->ntb->pdev;
1316
1317         perf->dbgfs_dir = debugfs_create_dir(pci_name(pdev), perf_dbgfs_topdir);
1318         if (!perf->dbgfs_dir) {
1319                 dev_warn(&perf->ntb->dev, "DebugFS unsupported\n");
1320                 return;
1321         }
1322
1323         debugfs_create_file("info", 0600, perf->dbgfs_dir, perf,
1324                             &perf_dbgfs_info);
1325
1326         debugfs_create_file("run", 0600, perf->dbgfs_dir, perf,
1327                             &perf_dbgfs_run);
1328
1329         debugfs_create_file("threads_count", 0600, perf->dbgfs_dir, perf,
1330                             &perf_dbgfs_tcnt);
1331
1332         /* They are made read-only for test exec safety and integrity */
1333         debugfs_create_u8("chunk_order", 0500, perf->dbgfs_dir, &chunk_order);
1334
1335         debugfs_create_u8("total_order", 0500, perf->dbgfs_dir, &total_order);
1336
1337         debugfs_create_bool("use_dma", 0500, perf->dbgfs_dir, &use_dma);
1338 }
1339
1340 static void perf_clear_dbgfs(struct perf_ctx *perf)
1341 {
1342         debugfs_remove_recursive(perf->dbgfs_dir);
1343 }
1344
1345 /*==============================================================================
1346  *                        Basic driver initialization
1347  *==============================================================================
1348  */
1349
1350 static struct perf_ctx *perf_create_data(struct ntb_dev *ntb)
1351 {
1352         struct perf_ctx *perf;
1353
1354         perf = devm_kzalloc(&ntb->dev, sizeof(*perf), GFP_KERNEL);
1355         if (!perf)
1356                 return ERR_PTR(-ENOMEM);
1357
1358         perf->pcnt = ntb_peer_port_count(ntb);
1359         perf->peers = devm_kcalloc(&ntb->dev, perf->pcnt, sizeof(*perf->peers),
1360                                   GFP_KERNEL);
1361         if (!perf->peers)
1362                 return ERR_PTR(-ENOMEM);
1363
1364         perf->ntb = ntb;
1365
1366         return perf;
1367 }
1368
1369 static int perf_setup_peer_mw(struct perf_peer *peer)
1370 {
1371         struct perf_ctx *perf = peer->perf;
1372         phys_addr_t phys_addr;
1373         int ret;
1374
1375         /* Get outbound MW parameters and map it */
1376         ret = ntb_peer_mw_get_addr(perf->ntb, perf->gidx, &phys_addr,
1377                                    &peer->outbuf_size);
1378         if (ret)
1379                 return ret;
1380
1381         peer->outbuf = devm_ioremap_wc(&perf->ntb->dev, phys_addr,
1382                                         peer->outbuf_size);
1383         if (!peer->outbuf)
1384                 return -ENOMEM;
1385
1386         if (max_mw_size && peer->outbuf_size > max_mw_size) {
1387                 peer->outbuf_size = max_mw_size;
1388                 dev_warn(&peer->perf->ntb->dev,
1389                         "Peer %d outbuf reduced to %pa\n", peer->pidx,
1390                         &peer->outbuf_size);
1391         }
1392
1393         return 0;
1394 }
1395
1396 static int perf_init_peers(struct perf_ctx *perf)
1397 {
1398         struct perf_peer *peer;
1399         int pidx, lport, ret;
1400
1401         lport = ntb_port_number(perf->ntb);
1402         perf->gidx = -1;
1403         for (pidx = 0; pidx < perf->pcnt; pidx++) {
1404                 peer = &perf->peers[pidx];
1405
1406                 peer->perf = perf;
1407                 peer->pidx = pidx;
1408                 if (lport < ntb_peer_port_number(perf->ntb, pidx)) {
1409                         if (perf->gidx == -1)
1410                                 perf->gidx = pidx;
1411                         peer->gidx = pidx + 1;
1412                 } else {
1413                         peer->gidx = pidx;
1414                 }
1415                 INIT_WORK(&peer->service, perf_service_work);
1416         }
1417         if (perf->gidx == -1)
1418                 perf->gidx = pidx;
1419
1420         for (pidx = 0; pidx < perf->pcnt; pidx++) {
1421                 ret = perf_setup_peer_mw(&perf->peers[pidx]);
1422                 if (ret)
1423                         return ret;
1424         }
1425
1426         dev_dbg(&perf->ntb->dev, "Global port index %d\n", perf->gidx);
1427
1428         return 0;
1429 }
1430
1431 static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
1432 {
1433         struct perf_ctx *perf;
1434         int ret;
1435
1436         perf = perf_create_data(ntb);
1437         if (IS_ERR(perf))
1438                 return PTR_ERR(perf);
1439
1440         ret = perf_init_peers(perf);
1441         if (ret)
1442                 return ret;
1443
1444         perf_init_threads(perf);
1445
1446         ret = perf_init_service(perf);
1447         if (ret)
1448                 return ret;
1449
1450         ret = perf_enable_service(perf);
1451         if (ret)
1452                 return ret;
1453
1454         perf_setup_dbgfs(perf);
1455
1456         return 0;
1457 }
1458
1459 static void perf_remove(struct ntb_client *client, struct ntb_dev *ntb)
1460 {
1461         struct perf_ctx *perf = ntb->ctx;
1462
1463         perf_clear_dbgfs(perf);
1464
1465         perf_disable_service(perf);
1466
1467         perf_clear_threads(perf);
1468 }
1469
1470 static struct ntb_client perf_client = {
1471         .ops = {
1472                 .probe = perf_probe,
1473                 .remove = perf_remove
1474         }
1475 };
1476
1477 static int __init perf_init(void)
1478 {
1479         int ret;
1480
1481         if (chunk_order > MAX_CHUNK_ORDER) {
1482                 chunk_order = MAX_CHUNK_ORDER;
1483                 pr_info("Chunk order reduced to %hhu\n", chunk_order);
1484         }
1485
1486         if (total_order < chunk_order) {
1487                 total_order = chunk_order;
1488                 pr_info("Total data order reduced to %hhu\n", total_order);
1489         }
1490
1491         perf_wq = alloc_workqueue("perf_wq", WQ_UNBOUND | WQ_SYSFS, 0);
1492         if (!perf_wq)
1493                 return -ENOMEM;
1494
1495         if (debugfs_initialized())
1496                 perf_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
1497
1498         ret = ntb_register_client(&perf_client);
1499         if (ret) {
1500                 debugfs_remove_recursive(perf_dbgfs_topdir);
1501                 destroy_workqueue(perf_wq);
1502         }
1503
1504         return ret;
1505 }
1506 module_init(perf_init);
1507
1508 static void __exit perf_exit(void)
1509 {
1510         ntb_unregister_client(&perf_client);
1511         debugfs_remove_recursive(perf_dbgfs_topdir);
1512         destroy_workqueue(perf_wq);
1513 }
1514 module_exit(perf_exit);
1515