drivers/infiniband/hw/hfi1/debugfs.c

   1 #ifdef CONFIG_DEBUG_FS
   2 /*
   3  * Copyright(c) 2015, 2016 Intel Corporation.
   4  *
   5  * This file is provided under a dual BSD/GPLv2 license.  When using or
   6  * redistributing this file, you may do so under either license.
   7  *
   8  * GPL LICENSE SUMMARY
   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  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * BSD LICENSE
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  *
  25  *  - Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  *  - Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in
  29  *    the documentation and/or other materials provided with the
  30  *    distribution.
  31  *  - Neither the name of Intel Corporation nor the names of its
  32  *    contributors may be used to endorse or promote products derived
  33  *    from this software without specific prior written permission.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  38  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  39  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  42  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  43  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  44  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  45  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46  *
  47  */
  48 #include <linux/debugfs.h>
  49 #include <linux/seq_file.h>
  50 #include <linux/kernel.h>
  51 #include <linux/export.h>
  52 #include <linux/module.h>
  53
  54 #include "hfi.h"
  55 #include "debugfs.h"
  56 #include "device.h"
  57 #include "qp.h"
  58 #include "sdma.h"
  59
  60 static struct dentry *hfi1_dbg_root;
  61
  62 #define private2dd(file) (file_inode(file)->i_private)
  63 #define private2ppd(file) (file_inode(file)->i_private)
  64
  65 #define DEBUGFS_SEQ_FILE_OPS(name) \
  66 static const struct seq_operations _##name##_seq_ops = { \
  67         .start = _##name##_seq_start, \
  68         .next  = _##name##_seq_next, \
  69         .stop  = _##name##_seq_stop, \
  70         .show  = _##name##_seq_show \
  71 }
  72
  73 #define DEBUGFS_SEQ_FILE_OPEN(name) \
  74 static int _##name##_open(struct inode *inode, struct file *s) \
  75 { \
  76         struct seq_file *seq; \
  77         int ret; \
  78         ret =  seq_open(s, &_##name##_seq_ops); \
  79         if (ret) \
  80                 return ret; \
  81         seq = s->private_data; \
  82         seq->private = inode->i_private; \
  83         return 0; \
  84 }
  85
  86 #define DEBUGFS_FILE_OPS(name) \
  87 static const struct file_operations _##name##_file_ops = { \
  88         .owner   = THIS_MODULE, \
  89         .open    = _##name##_open, \
  90         .read    = seq_read, \
  91         .llseek  = seq_lseek, \
  92         .release = seq_release \
  93 }
  94
  95 #define DEBUGFS_FILE_CREATE(name, parent, data, ops, mode)      \
  96 do { \
  97         struct dentry *ent; \
  98         ent = debugfs_create_file(name, mode, parent, \
  99                 data, ops); \
 100         if (!ent) \
 101                 pr_warn("create of %s failed\n", name); \
 102 } while (0)
 103
 104 #define DEBUGFS_SEQ_FILE_CREATE(name, parent, data) \
 105         DEBUGFS_FILE_CREATE(#name, parent, data, &_##name##_file_ops, S_IRUGO)
 106
 107 static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
 108 __acquires(RCU)
 109 {
 110         struct hfi1_opcode_stats_perctx *opstats;
 111
 112         rcu_read_lock();
 113         if (*pos >= ARRAY_SIZE(opstats->stats))
 114                 return NULL;
 115         return pos;
 116 }
 117
 118 static void *_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
 119 {
 120         struct hfi1_opcode_stats_perctx *opstats;
 121
 122         ++*pos;
 123         if (*pos >= ARRAY_SIZE(opstats->stats))
 124                 return NULL;
 125         return pos;
 126 }
 127
 128 static void _opcode_stats_seq_stop(struct seq_file *s, void *v)
 129 __releases(RCU)
 130 {
 131         rcu_read_unlock();
 132 }
 133
 134 static int _opcode_stats_seq_show(struct seq_file *s, void *v)
 135 {
 136         loff_t *spos = v;
 137         loff_t i = *spos, j;
 138         u64 n_packets = 0, n_bytes = 0;
 139         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
 140         struct hfi1_devdata *dd = dd_from_dev(ibd);
 141
 142         for (j = 0; j < dd->first_user_ctxt; j++) {
 143                 if (!dd->rcd[j])
 144                         continue;
 145                 n_packets += dd->rcd[j]->opstats->stats[i].n_packets;
 146                 n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes;
 147         }
 148         if (!n_packets && !n_bytes)
 149                 return SEQ_SKIP;
 150         seq_printf(s, "%02llx %llu/%llu\n", i,
 151                    (unsigned long long)n_packets,
 152                    (unsigned long long)n_bytes);
 153
 154         return 0;
 155 }
 156
 157 DEBUGFS_SEQ_FILE_OPS(opcode_stats);
 158 DEBUGFS_SEQ_FILE_OPEN(opcode_stats)
 159 DEBUGFS_FILE_OPS(opcode_stats);
 160
 161 static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
 162 {
 163         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
 164         struct hfi1_devdata *dd = dd_from_dev(ibd);
 165
 166         if (!*pos)
 167                 return SEQ_START_TOKEN;
 168         if (*pos >= dd->first_user_ctxt)
 169                 return NULL;
 170         return pos;
 171 }
 172
 173 static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
 174 {
 175         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
 176         struct hfi1_devdata *dd = dd_from_dev(ibd);
 177
 178         if (v == SEQ_START_TOKEN)
 179                 return pos;
 180
 181         ++*pos;
 182         if (*pos >= dd->first_user_ctxt)
 183                 return NULL;
 184         return pos;
 185 }
 186
 187 static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
 188 {
 189         /* nothing allocated */
 190 }
 191
 192 static int _ctx_stats_seq_show(struct seq_file *s, void *v)
 193 {
 194         loff_t *spos;
 195         loff_t i, j;
 196         u64 n_packets = 0;
 197         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
 198         struct hfi1_devdata *dd = dd_from_dev(ibd);
 199
 200         if (v == SEQ_START_TOKEN) {
 201                 seq_puts(s, "Ctx:npkts\n");
 202                 return 0;
 203         }
 204
 205         spos = v;
 206         i = *spos;
 207
 208         if (!dd->rcd[i])
 209                 return SEQ_SKIP;
 210
 211         for (j = 0; j < ARRAY_SIZE(dd->rcd[i]->opstats->stats); j++)
 212                 n_packets += dd->rcd[i]->opstats->stats[j].n_packets;
 213
 214         if (!n_packets)
 215                 return SEQ_SKIP;
 216
 217         seq_printf(s, "  %llu:%llu\n", i, n_packets);
 218         return 0;
 219 }
 220
 221 DEBUGFS_SEQ_FILE_OPS(ctx_stats);
 222 DEBUGFS_SEQ_FILE_OPEN(ctx_stats)
 223 DEBUGFS_FILE_OPS(ctx_stats);
 224
 225 static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
 226         __acquires(RCU)
 227 {
 228         struct qp_iter *iter;
 229         loff_t n = *pos;
 230
 231         iter = qp_iter_init(s->private);
 232
 233         /* stop calls rcu_read_unlock */
 234         rcu_read_lock();
 235
 236         if (!iter)
 237                 return NULL;
 238
 239         do {
 240                 if (qp_iter_next(iter)) {
 241                         kfree(iter);
 242                         return NULL;
 243                 }
 244         } while (n--);
 245
 246         return iter;
 247 }
 248
 249 static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
 250                                 loff_t *pos)
 251         __must_hold(RCU)
 252 {
 253         struct qp_iter *iter = iter_ptr;
 254
 255         (*pos)++;
 256
 257         if (qp_iter_next(iter)) {
 258                 kfree(iter);
 259                 return NULL;
 260         }
 261
 262         return iter;
 263 }
 264
 265 static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
 266         __releases(RCU)
 267 {
 268         rcu_read_unlock();
 269 }
 270
 271 static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
 272 {
 273         struct qp_iter *iter = iter_ptr;
 274
 275         if (!iter)
 276                 return 0;
 277
 278         qp_iter_print(s, iter);
 279
 280         return 0;
 281 }
 282
 283 DEBUGFS_SEQ_FILE_OPS(qp_stats);
 284 DEBUGFS_SEQ_FILE_OPEN(qp_stats)
 285 DEBUGFS_FILE_OPS(qp_stats);
 286
 287 static void *_sdes_seq_start(struct seq_file *s, loff_t *pos)
 288 __acquires(RCU)
 289 {
 290         struct hfi1_ibdev *ibd;
 291         struct hfi1_devdata *dd;
 292
 293         rcu_read_lock();
 294         ibd = (struct hfi1_ibdev *)s->private;
 295         dd = dd_from_dev(ibd);
 296         if (!dd->per_sdma || *pos >= dd->num_sdma)
 297                 return NULL;
 298         return pos;
 299 }
 300
 301 static void *_sdes_seq_next(struct seq_file *s, void *v, loff_t *pos)
 302 {
 303         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
 304         struct hfi1_devdata *dd = dd_from_dev(ibd);
 305
 306         ++*pos;
 307         if (!dd->per_sdma || *pos >= dd->num_sdma)
 308                 return NULL;
 309         return pos;
 310 }
 311
 312 static void _sdes_seq_stop(struct seq_file *s, void *v)
 313 __releases(RCU)
 314 {
 315         rcu_read_unlock();
 316 }
 317
 318 static int _sdes_seq_show(struct seq_file *s, void *v)
 319 {
 320         struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
 321         struct hfi1_devdata *dd = dd_from_dev(ibd);
 322         loff_t *spos = v;
 323         loff_t i = *spos;
 324
 325         sdma_seqfile_dump_sde(s, &dd->per_sdma[i]);
 326         return 0;
 327 }
 328
 329 DEBUGFS_SEQ_FILE_OPS(sdes);
 330 DEBUGFS_SEQ_FILE_OPEN(sdes)
 331 DEBUGFS_FILE_OPS(sdes);
 332
 333 /* read the per-device counters */
 334 static ssize_t dev_counters_read(struct file *file, char __user *buf,
 335                                  size_t count, loff_t *ppos)
 336 {
 337         u64 *counters;
 338         size_t avail;
 339         struct hfi1_devdata *dd;
 340         ssize_t rval;
 341
 342         rcu_read_lock();
 343         dd = private2dd(file);
 344         avail = hfi1_read_cntrs(dd, NULL, &counters);
 345         rval =  simple_read_from_buffer(buf, count, ppos, counters, avail);
 346         rcu_read_unlock();
 347         return rval;
 348 }
 349
 350 /* read the per-device counters */
 351 static ssize_t dev_names_read(struct file *file, char __user *buf,
 352                               size_t count, loff_t *ppos)
 353 {
 354         char *names;
 355         size_t avail;
 356         struct hfi1_devdata *dd;
 357         ssize_t rval;
 358
 359         rcu_read_lock();
 360         dd = private2dd(file);
 361         avail = hfi1_read_cntrs(dd, &names, NULL);
 362         rval =  simple_read_from_buffer(buf, count, ppos, names, avail);
 363         rcu_read_unlock();
 364         return rval;
 365 }
 366
 367 struct counter_info {
 368         char *name;
 369         const struct file_operations ops;
 370 };
 371
 372 /*
 373  * Could use file_inode(file)->i_ino to figure out which file,
 374  * instead of separate routine for each, but for now, this works...
 375  */
 376
 377 /* read the per-port names (same for each port) */
 378 static ssize_t portnames_read(struct file *file, char __user *buf,
 379                               size_t count, loff_t *ppos)
 380 {
 381         char *names;
 382         size_t avail;
 383         struct hfi1_devdata *dd;
 384         ssize_t rval;
 385
 386         rcu_read_lock();
 387         dd = private2dd(file);
 388         avail = hfi1_read_portcntrs(dd->pport, &names, NULL);
 389         rval = simple_read_from_buffer(buf, count, ppos, names, avail);
 390         rcu_read_unlock();
 391         return rval;
 392 }
 393
 394 /* read the per-port counters */
 395 static ssize_t portcntrs_debugfs_read(struct file *file, char __user *buf,
 396                                       size_t count, loff_t *ppos)
 397 {
 398         u64 *counters;
 399         size_t avail;
 400         struct hfi1_pportdata *ppd;
 401         ssize_t rval;
 402
 403         rcu_read_lock();
 404         ppd = private2ppd(file);
 405         avail = hfi1_read_portcntrs(ppd, NULL, &counters);
 406         rval = simple_read_from_buffer(buf, count, ppos, counters, avail);
 407         rcu_read_unlock();
 408         return rval;
 409 }
 410
 411 static void check_dyn_flag(u64 scratch0, char *p, int size, int *used,
 412                            int this_hfi, int hfi, u32 flag, const char *what)
 413 {
 414         u32 mask;
 415
 416         mask = flag << (hfi ? CR_DYN_SHIFT : 0);
 417         if (scratch0 & mask) {
 418                 *used += scnprintf(p + *used, size - *used,
 419                                    "  0x%08x - HFI%d %s in use, %s device\n",
 420                                    mask, hfi, what,
 421                                    this_hfi == hfi ? "this" : "other");
 422         }
 423 }
 424
 425 static ssize_t asic_flags_read(struct file *file, char __user *buf,
 426                                size_t count, loff_t *ppos)
 427 {
 428         struct hfi1_pportdata *ppd;
 429         struct hfi1_devdata *dd;
 430         u64 scratch0;
 431         char *tmp;
 432         int ret = 0;
 433         int size;
 434         int used;
 435         int i;
 436
 437         rcu_read_lock();
 438         ppd = private2ppd(file);
 439         dd = ppd->dd;
 440         size = PAGE_SIZE;
 441         used = 0;
 442         tmp = kmalloc(size, GFP_KERNEL);
 443         if (!tmp) {
 444                 rcu_read_unlock();
 445                 return -ENOMEM;
 446         }
 447
 448         scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
 449         used += scnprintf(tmp + used, size - used,
 450                           "Resource flags: 0x%016llx\n", scratch0);
 451
 452         /* check permanent flag */
 453         if (scratch0 & CR_THERM_INIT) {
 454                 used += scnprintf(tmp + used, size - used,
 455                                   "  0x%08x - thermal monitoring initialized\n",
 456                                   (u32)CR_THERM_INIT);
 457         }
 458
 459         /* check each dynamic flag on each HFI */
 460         for (i = 0; i < 2; i++) {
 461                 check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
 462                                CR_SBUS, "SBus");
 463                 check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
 464                                CR_EPROM, "EPROM");
 465                 check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
 466                                CR_I2C1, "i2c chain 1");
 467                 check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
 468                                CR_I2C2, "i2c chain 2");
 469         }
 470         used += scnprintf(tmp + used, size - used, "Write bits to clear\n");
 471
 472         ret = simple_read_from_buffer(buf, count, ppos, tmp, used);
 473         rcu_read_unlock();
 474         kfree(tmp);
 475         return ret;
 476 }
 477
 478 static ssize_t asic_flags_write(struct file *file, const char __user *buf,
 479                                 size_t count, loff_t *ppos)
 480 {
 481         struct hfi1_pportdata *ppd;
 482         struct hfi1_devdata *dd;
 483         char *buff;
 484         int ret;
 485         unsigned long long value;
 486         u64 scratch0;
 487         u64 clear;
 488
 489         rcu_read_lock();
 490         ppd = private2ppd(file);
 491         dd = ppd->dd;
 492
 493         buff = kmalloc(count + 1, GFP_KERNEL);
 494         if (!buff) {
 495                 ret = -ENOMEM;
 496                 goto do_return;
 497         }
 498
 499         ret = copy_from_user(buff, buf, count);
 500         if (ret > 0) {
 501                 ret = -EFAULT;
 502                 goto do_free;
 503         }
 504
 505         /* zero terminate and read the expected integer */
 506         buff[count] = 0;
 507         ret = kstrtoull(buff, 0, &value);
 508         if (ret)
 509                 goto do_free;
 510         clear = value;
 511
 512         /* obtain exclusive access */
 513         mutex_lock(&dd->asic_data->asic_resource_mutex);
 514         acquire_hw_mutex(dd);
 515
 516         scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
 517         scratch0 &= ~clear;
 518         write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
 519         /* force write to be visible to other HFI on another OS */
 520         (void)read_csr(dd, ASIC_CFG_SCRATCH);
 521
 522         release_hw_mutex(dd);
 523         mutex_unlock(&dd->asic_data->asic_resource_mutex);
 524
 525         /* return the number of bytes written */
 526         ret = count;
 527
 528  do_free:
 529         kfree(buff);
 530  do_return:
 531         rcu_read_unlock();
 532         return ret;
 533 }
 534
 535 /*
 536  * read the per-port QSFP data for ppd
 537  */
 538 static ssize_t qsfp_debugfs_dump(struct file *file, char __user *buf,
 539                                  size_t count, loff_t *ppos)
 540 {
 541         struct hfi1_pportdata *ppd;
 542         char *tmp;
 543         int ret;
 544
 545         rcu_read_lock();
 546         ppd = private2ppd(file);
 547         tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
 548         if (!tmp) {
 549                 rcu_read_unlock();
 550                 return -ENOMEM;
 551         }
 552
 553         ret = qsfp_dump(ppd, tmp, PAGE_SIZE);
 554         if (ret > 0)
 555                 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
 556         rcu_read_unlock();
 557         kfree(tmp);
 558         return ret;
 559 }
 560
 561 /* Do an i2c write operation on the chain for the given HFI. */
 562 static ssize_t __i2c_debugfs_write(struct file *file, const char __user *buf,
 563                                    size_t count, loff_t *ppos, u32 target)
 564 {
 565         struct hfi1_pportdata *ppd;
 566         char *buff;
 567         int ret;
 568         int i2c_addr;
 569         int offset;
 570         int total_written;
 571
 572         rcu_read_lock();
 573         ppd = private2ppd(file);
 574
 575         /* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
 576         i2c_addr = (*ppos >> 16) & 0xffff;
 577         offset = *ppos & 0xffff;
 578
 579         /* explicitly reject invalid address 0 to catch cp and cat */
 580         if (i2c_addr == 0) {
 581                 ret = -EINVAL;
 582                 goto _return;
 583         }
 584
 585         buff = kmalloc(count, GFP_KERNEL);
 586         if (!buff) {
 587                 ret = -ENOMEM;
 588                 goto _return;
 589         }
 590
 591         ret = copy_from_user(buff, buf, count);
 592         if (ret > 0) {
 593                 ret = -EFAULT;
 594                 goto _free;
 595         }
 596
 597         total_written = i2c_write(ppd, target, i2c_addr, offset, buff, count);
 598         if (total_written < 0) {
 599                 ret = total_written;
 600                 goto _free;
 601         }
 602
 603         *ppos += total_written;
 604
 605         ret = total_written;
 606
 607  _free:
 608         kfree(buff);
 609  _return:
 610         rcu_read_unlock();
 611         return ret;
 612 }
 613
 614 /* Do an i2c write operation on chain for HFI 0. */
 615 static ssize_t i2c1_debugfs_write(struct file *file, const char __user *buf,
 616                                   size_t count, loff_t *ppos)
 617 {
 618         return __i2c_debugfs_write(file, buf, count, ppos, 0);
 619 }
 620
 621 /* Do an i2c write operation on chain for HFI 1. */
 622 static ssize_t i2c2_debugfs_write(struct file *file, const char __user *buf,
 623                                   size_t count, loff_t *ppos)
 624 {
 625         return __i2c_debugfs_write(file, buf, count, ppos, 1);
 626 }
 627
 628 /* Do an i2c read operation on the chain for the given HFI. */
 629 static ssize_t __i2c_debugfs_read(struct file *file, char __user *buf,
 630                                   size_t count, loff_t *ppos, u32 target)
 631 {
 632         struct hfi1_pportdata *ppd;
 633         char *buff;
 634         int ret;
 635         int i2c_addr;
 636         int offset;
 637         int total_read;
 638
 639         rcu_read_lock();
 640         ppd = private2ppd(file);
 641
 642         /* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
 643         i2c_addr = (*ppos >> 16) & 0xffff;
 644         offset = *ppos & 0xffff;
 645
 646         /* explicitly reject invalid address 0 to catch cp and cat */
 647         if (i2c_addr == 0) {
 648                 ret = -EINVAL;
 649                 goto _return;
 650         }
 651
 652         buff = kmalloc(count, GFP_KERNEL);
 653         if (!buff) {
 654                 ret = -ENOMEM;
 655                 goto _return;
 656         }
 657
 658         total_read = i2c_read(ppd, target, i2c_addr, offset, buff, count);
 659         if (total_read < 0) {
 660                 ret = total_read;
 661                 goto _free;
 662         }
 663
 664         *ppos += total_read;
 665
 666         ret = copy_to_user(buf, buff, total_read);
 667         if (ret > 0) {
 668                 ret = -EFAULT;
 669                 goto _free;
 670         }
 671
 672         ret = total_read;
 673
 674  _free:
 675         kfree(buff);
 676  _return:
 677         rcu_read_unlock();
 678         return ret;
 679 }
 680
 681 /* Do an i2c read operation on chain for HFI 0. */
 682 static ssize_t i2c1_debugfs_read(struct file *file, char __user *buf,
 683                                  size_t count, loff_t *ppos)
 684 {
 685         return __i2c_debugfs_read(file, buf, count, ppos, 0);
 686 }
 687
 688 /* Do an i2c read operation on chain for HFI 1. */
 689 static ssize_t i2c2_debugfs_read(struct file *file, char __user *buf,
 690                                  size_t count, loff_t *ppos)
 691 {
 692         return __i2c_debugfs_read(file, buf, count, ppos, 1);
 693 }
 694
 695 /* Do a QSFP write operation on the i2c chain for the given HFI. */
 696 static ssize_t __qsfp_debugfs_write(struct file *file, const char __user *buf,
 697                                     size_t count, loff_t *ppos, u32 target)
 698 {
 699         struct hfi1_pportdata *ppd;
 700         char *buff;
 701         int ret;
 702         int total_written;
 703
 704         rcu_read_lock();
 705         if (*ppos + count > QSFP_PAGESIZE * 4) { /* base page + page00-page03 */
 706                 ret = -EINVAL;
 707                 goto _return;
 708         }
 709
 710         ppd = private2ppd(file);
 711
 712         buff = kmalloc(count, GFP_KERNEL);
 713         if (!buff) {
 714                 ret = -ENOMEM;
 715                 goto _return;
 716         }
 717
 718         ret = copy_from_user(buff, buf, count);
 719         if (ret > 0) {
 720                 ret = -EFAULT;
 721                 goto _free;
 722         }
 723
 724         total_written = qsfp_write(ppd, target, *ppos, buff, count);
 725         if (total_written < 0) {
 726                 ret = total_written;
 727                 goto _free;
 728         }
 729
 730         *ppos += total_written;
 731
 732         ret = total_written;
 733
 734  _free:
 735         kfree(buff);
 736  _return:
 737         rcu_read_unlock();
 738         return ret;
 739 }
 740
 741 /* Do a QSFP write operation on i2c chain for HFI 0. */
 742 static ssize_t qsfp1_debugfs_write(struct file *file, const char __user *buf,
 743                                    size_t count, loff_t *ppos)
 744 {
 745         return __qsfp_debugfs_write(file, buf, count, ppos, 0);
 746 }
 747
 748 /* Do a QSFP write operation on i2c chain for HFI 1. */
 749 static ssize_t qsfp2_debugfs_write(struct file *file, const char __user *buf,
 750                                    size_t count, loff_t *ppos)
 751 {
 752         return __qsfp_debugfs_write(file, buf, count, ppos, 1);
 753 }
 754
 755 /* Do a QSFP read operation on the i2c chain for the given HFI. */
 756 static ssize_t __qsfp_debugfs_read(struct file *file, char __user *buf,
 757                                    size_t count, loff_t *ppos, u32 target)
 758 {
 759         struct hfi1_pportdata *ppd;
 760         char *buff;
 761         int ret;
 762         int total_read;
 763
 764         rcu_read_lock();
 765         if (*ppos + count > QSFP_PAGESIZE * 4) { /* base page + page00-page03 */
 766                 ret = -EINVAL;
 767                 goto _return;
 768         }
 769
 770         ppd = private2ppd(file);
 771
 772         buff = kmalloc(count, GFP_KERNEL);
 773         if (!buff) {
 774                 ret = -ENOMEM;
 775                 goto _return;
 776         }
 777
 778         total_read = qsfp_read(ppd, target, *ppos, buff, count);
 779         if (total_read < 0) {
 780                 ret = total_read;
 781                 goto _free;
 782         }
 783
 784         *ppos += total_read;
 785
 786         ret = copy_to_user(buf, buff, total_read);
 787         if (ret > 0) {
 788                 ret = -EFAULT;
 789                 goto _free;
 790         }
 791
 792         ret = total_read;
 793
 794  _free:
 795         kfree(buff);
 796  _return:
 797         rcu_read_unlock();
 798         return ret;
 799 }
 800
 801 /* Do a QSFP read operation on i2c chain for HFI 0. */
 802 static ssize_t qsfp1_debugfs_read(struct file *file, char __user *buf,
 803                                   size_t count, loff_t *ppos)
 804 {
 805         return __qsfp_debugfs_read(file, buf, count, ppos, 0);
 806 }
 807
 808 /* Do a QSFP read operation on i2c chain for HFI 1. */
 809 static ssize_t qsfp2_debugfs_read(struct file *file, char __user *buf,
 810                                   size_t count, loff_t *ppos)
 811 {
 812         return __qsfp_debugfs_read(file, buf, count, ppos, 1);
 813 }
 814
 815 static int __i2c_debugfs_open(struct inode *in, struct file *fp, u32 target)
 816 {
 817         struct hfi1_pportdata *ppd;
 818         int ret;
 819
 820         if (!try_module_get(THIS_MODULE))
 821                 return -ENODEV;
 822
 823         ppd = private2ppd(fp);
 824
 825         ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
 826         if (ret) /* failed - release the module */
 827                 module_put(THIS_MODULE);
 828
 829         return ret;
 830 }
 831
 832 static int i2c1_debugfs_open(struct inode *in, struct file *fp)
 833 {
 834         return __i2c_debugfs_open(in, fp, 0);
 835 }
 836
 837 static int i2c2_debugfs_open(struct inode *in, struct file *fp)
 838 {
 839         return __i2c_debugfs_open(in, fp, 1);
 840 }
 841
 842 static int __i2c_debugfs_release(struct inode *in, struct file *fp, u32 target)
 843 {
 844         struct hfi1_pportdata *ppd;
 845
 846         ppd = private2ppd(fp);
 847
 848         release_chip_resource(ppd->dd, i2c_target(target));
 849         module_put(THIS_MODULE);
 850
 851         return 0;
 852 }
 853
 854 static int i2c1_debugfs_release(struct inode *in, struct file *fp)
 855 {
 856         return __i2c_debugfs_release(in, fp, 0);
 857 }
 858
 859 static int i2c2_debugfs_release(struct inode *in, struct file *fp)
 860 {
 861         return __i2c_debugfs_release(in, fp, 1);
 862 }
 863
 864 static int __qsfp_debugfs_open(struct inode *in, struct file *fp, u32 target)
 865 {
 866         struct hfi1_pportdata *ppd;
 867         int ret;
 868
 869         if (!try_module_get(THIS_MODULE))
 870                 return -ENODEV;
 871
 872         ppd = private2ppd(fp);
 873
 874         ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
 875         if (ret) /* failed - release the module */
 876                 module_put(THIS_MODULE);
 877
 878         return ret;
 879 }
 880
 881 static int qsfp1_debugfs_open(struct inode *in, struct file *fp)
 882 {
 883         return __qsfp_debugfs_open(in, fp, 0);
 884 }
 885
 886 static int qsfp2_debugfs_open(struct inode *in, struct file *fp)
 887 {
 888         return __qsfp_debugfs_open(in, fp, 1);
 889 }
 890
 891 static int __qsfp_debugfs_release(struct inode *in, struct file *fp, u32 target)
 892 {
 893         struct hfi1_pportdata *ppd;
 894
 895         ppd = private2ppd(fp);
 896
 897         release_chip_resource(ppd->dd, i2c_target(target));
 898         module_put(THIS_MODULE);
 899
 900         return 0;
 901 }
 902
 903 static int qsfp1_debugfs_release(struct inode *in, struct file *fp)
 904 {
 905         return __qsfp_debugfs_release(in, fp, 0);
 906 }
 907
 908 static int qsfp2_debugfs_release(struct inode *in, struct file *fp)
 909 {
 910         return __qsfp_debugfs_release(in, fp, 1);
 911 }
 912
 913 #define DEBUGFS_OPS(nm, readroutine, writeroutine)      \
 914 { \
 915         .name = nm, \
 916         .ops = { \
 917                 .read = readroutine, \
 918                 .write = writeroutine, \
 919                 .llseek = generic_file_llseek, \
 920         }, \
 921 }
 922
 923 #define DEBUGFS_XOPS(nm, readf, writef, openf, releasef) \
 924 { \
 925         .name = nm, \
 926         .ops = { \
 927                 .read = readf, \
 928                 .write = writef, \
 929                 .llseek = generic_file_llseek, \
 930                 .open = openf, \
 931                 .release = releasef \
 932         }, \
 933 }
 934
 935 static const struct counter_info cntr_ops[] = {
 936         DEBUGFS_OPS("counter_names", dev_names_read, NULL),
 937         DEBUGFS_OPS("counters", dev_counters_read, NULL),
 938         DEBUGFS_OPS("portcounter_names", portnames_read, NULL),
 939 };
 940
 941 static const struct counter_info port_cntr_ops[] = {
 942         DEBUGFS_OPS("port%dcounters", portcntrs_debugfs_read, NULL),
 943         DEBUGFS_XOPS("i2c1", i2c1_debugfs_read, i2c1_debugfs_write,
 944                      i2c1_debugfs_open, i2c1_debugfs_release),
 945         DEBUGFS_XOPS("i2c2", i2c2_debugfs_read, i2c2_debugfs_write,
 946                      i2c2_debugfs_open, i2c2_debugfs_release),
 947         DEBUGFS_OPS("qsfp_dump%d", qsfp_debugfs_dump, NULL),
 948         DEBUGFS_XOPS("qsfp1", qsfp1_debugfs_read, qsfp1_debugfs_write,
 949                      qsfp1_debugfs_open, qsfp1_debugfs_release),
 950         DEBUGFS_XOPS("qsfp2", qsfp2_debugfs_read, qsfp2_debugfs_write,
 951                      qsfp2_debugfs_open, qsfp2_debugfs_release),
 952         DEBUGFS_OPS("asic_flags", asic_flags_read, asic_flags_write),
 953 };
 954
 955 void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
 956 {
 957         char name[sizeof("port0counters") + 1];
 958         char link[10];
 959         struct hfi1_devdata *dd = dd_from_dev(ibd);
 960         struct hfi1_pportdata *ppd;
 961         int unit = dd->unit;
 962         int i, j;
 963
 964         if (!hfi1_dbg_root)
 965                 return;
 966         snprintf(name, sizeof(name), "%s_%d", class_name(), unit);
 967         snprintf(link, sizeof(link), "%d", unit);
 968         ibd->hfi1_ibdev_dbg = debugfs_create_dir(name, hfi1_dbg_root);
 969         if (!ibd->hfi1_ibdev_dbg) {
 970                 pr_warn("create of %s failed\n", name);
 971                 return;
 972         }
 973         ibd->hfi1_ibdev_link =
 974                 debugfs_create_symlink(link, hfi1_dbg_root, name);
 975         if (!ibd->hfi1_ibdev_link) {
 976                 pr_warn("create of %s symlink failed\n", name);
 977                 return;
 978         }
 979         DEBUGFS_SEQ_FILE_CREATE(opcode_stats, ibd->hfi1_ibdev_dbg, ibd);
 980         DEBUGFS_SEQ_FILE_CREATE(ctx_stats, ibd->hfi1_ibdev_dbg, ibd);
 981         DEBUGFS_SEQ_FILE_CREATE(qp_stats, ibd->hfi1_ibdev_dbg, ibd);
 982         DEBUGFS_SEQ_FILE_CREATE(sdes, ibd->hfi1_ibdev_dbg, ibd);
 983         /* dev counter files */
 984         for (i = 0; i < ARRAY_SIZE(cntr_ops); i++)
 985                 DEBUGFS_FILE_CREATE(cntr_ops[i].name,
 986                                     ibd->hfi1_ibdev_dbg,
 987                                     dd,
 988                                     &cntr_ops[i].ops, S_IRUGO);
 989         /* per port files */
 990         for (ppd = dd->pport, j = 0; j < dd->num_pports; j++, ppd++)
 991                 for (i = 0; i < ARRAY_SIZE(port_cntr_ops); i++) {
 992                         snprintf(name,
 993                                  sizeof(name),
 994                                  port_cntr_ops[i].name,
 995                                  j + 1);
 996                         DEBUGFS_FILE_CREATE(name,
 997                                             ibd->hfi1_ibdev_dbg,
 998                                             ppd,
 999                                             &port_cntr_ops[i].ops,
1000                                             !port_cntr_ops[i].ops.write ?
1001                                             S_IRUGO : S_IRUGO | S_IWUSR);
1002                 }
1003 }
1004
1005 void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd)
1006 {
1007         if (!hfi1_dbg_root)
1008                 goto out;
1009         debugfs_remove(ibd->hfi1_ibdev_link);
1010         debugfs_remove_recursive(ibd->hfi1_ibdev_dbg);
1011 out:
1012         ibd->hfi1_ibdev_dbg = NULL;
1013         synchronize_rcu();
1014 }
1015
1016 /*
1017  * driver stats field names, one line per stat, single string.  Used by
1018  * programs like hfistats to print the stats in a way which works for
1019  * different versions of drivers, without changing program source.
1020  * if hfi1_ib_stats changes, this needs to change.  Names need to be
1021  * 12 chars or less (w/o newline), for proper display by hfistats utility.
1022  */
1023 static const char * const hfi1_statnames[] = {
1024         /* must be element 0*/
1025         "KernIntr",
1026         "ErrorIntr",
1027         "Tx_Errs",
1028         "Rcv_Errs",
1029         "H/W_Errs",
1030         "NoPIOBufs",
1031         "CtxtsOpen",
1032         "RcvLen_Errs",
1033         "EgrBufFull",
1034         "EgrHdrFull"
1035 };
1036
1037 static void *_driver_stats_names_seq_start(struct seq_file *s, loff_t *pos)
1038 __acquires(RCU)
1039 {
1040         rcu_read_lock();
1041         if (*pos >= ARRAY_SIZE(hfi1_statnames))
1042                 return NULL;
1043         return pos;
1044 }
1045
1046 static void *_driver_stats_names_seq_next(
1047         struct seq_file *s,
1048         void *v,
1049         loff_t *pos)
1050 {
1051         ++*pos;
1052         if (*pos >= ARRAY_SIZE(hfi1_statnames))
1053                 return NULL;
1054         return pos;
1055 }
1056
1057 static void _driver_stats_names_seq_stop(struct seq_file *s, void *v)
1058 __releases(RCU)
1059 {
1060         rcu_read_unlock();
1061 }
1062
1063 static int _driver_stats_names_seq_show(struct seq_file *s, void *v)
1064 {
1065         loff_t *spos = v;
1066
1067         seq_printf(s, "%s\n", hfi1_statnames[*spos]);
1068         return 0;
1069 }
1070
1071 DEBUGFS_SEQ_FILE_OPS(driver_stats_names);
1072 DEBUGFS_SEQ_FILE_OPEN(driver_stats_names)
1073 DEBUGFS_FILE_OPS(driver_stats_names);
1074
1075 static void *_driver_stats_seq_start(struct seq_file *s, loff_t *pos)
1076 __acquires(RCU)
1077 {
1078         rcu_read_lock();
1079         if (*pos >= ARRAY_SIZE(hfi1_statnames))
1080                 return NULL;
1081         return pos;
1082 }
1083
1084 static void *_driver_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
1085 {
1086         ++*pos;
1087         if (*pos >= ARRAY_SIZE(hfi1_statnames))
1088                 return NULL;
1089         return pos;
1090 }
1091
1092 static void _driver_stats_seq_stop(struct seq_file *s, void *v)
1093 __releases(RCU)
1094 {
1095         rcu_read_unlock();
1096 }
1097
1098 static u64 hfi1_sps_ints(void)
1099 {
1100         unsigned long flags;
1101         struct hfi1_devdata *dd;
1102         u64 sps_ints = 0;
1103
1104         spin_lock_irqsave(&hfi1_devs_lock, flags);
1105         list_for_each_entry(dd, &hfi1_dev_list, list) {
1106                 sps_ints += get_all_cpu_total(dd->int_counter);
1107         }
1108         spin_unlock_irqrestore(&hfi1_devs_lock, flags);
1109         return sps_ints;
1110 }
1111
1112 static int _driver_stats_seq_show(struct seq_file *s, void *v)
1113 {
1114         loff_t *spos = v;
1115         char *buffer;
1116         u64 *stats = (u64 *)&hfi1_stats;
1117         size_t sz = seq_get_buf(s, &buffer);
1118
1119         if (sz < sizeof(u64))
1120                 return SEQ_SKIP;
1121         /* special case for interrupts */
1122         if (*spos == 0)
1123                 *(u64 *)buffer = hfi1_sps_ints();
1124         else
1125                 *(u64 *)buffer = stats[*spos];
1126         seq_commit(s,  sizeof(u64));
1127         return 0;
1128 }
1129
1130 DEBUGFS_SEQ_FILE_OPS(driver_stats);
1131 DEBUGFS_SEQ_FILE_OPEN(driver_stats)
1132 DEBUGFS_FILE_OPS(driver_stats);
1133
1134 void hfi1_dbg_init(void)
1135 {
1136         hfi1_dbg_root  = debugfs_create_dir(DRIVER_NAME, NULL);
1137         if (!hfi1_dbg_root)
1138                 pr_warn("init of debugfs failed\n");
1139         DEBUGFS_SEQ_FILE_CREATE(driver_stats_names, hfi1_dbg_root, NULL);
1140         DEBUGFS_SEQ_FILE_CREATE(driver_stats, hfi1_dbg_root, NULL);
1141 }
1142
1143 void hfi1_dbg_exit(void)
1144 {
1145         debugfs_remove_recursive(hfi1_dbg_root);
1146         hfi1_dbg_root = NULL;
1147 }
1148
1149 #endif