drivers/net/ethernet/mellanox/mlx5/core/debugfs.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/debugfs.h>
  35 #include <linux/mlx5/qp.h>
  36 #include <linux/mlx5/cq.h>
  37 #include <linux/mlx5/driver.h>
  38 #include "mlx5_core.h"
  39
  40 enum {
  41         QP_PID,
  42         QP_STATE,
  43         QP_XPORT,
  44         QP_MTU,
  45         QP_N_RECV,
  46         QP_RECV_SZ,
  47         QP_N_SEND,
  48         QP_LOG_PG_SZ,
  49         QP_RQPN,
  50 };
  51
  52 static char *qp_fields[] = {
  53         [QP_PID]        = "pid",
  54         [QP_STATE]      = "state",
  55         [QP_XPORT]      = "transport",
  56         [QP_MTU]        = "mtu",
  57         [QP_N_RECV]     = "num_recv",
  58         [QP_RECV_SZ]    = "rcv_wqe_sz",
  59         [QP_N_SEND]     = "num_send",
  60         [QP_LOG_PG_SZ]  = "log2_page_sz",
  61         [QP_RQPN]       = "remote_qpn",
  62 };
  63
  64 enum {
  65         EQ_NUM_EQES,
  66         EQ_INTR,
  67         EQ_LOG_PG_SZ,
  68 };
  69
  70 static char *eq_fields[] = {
  71         [EQ_NUM_EQES]   = "num_eqes",
  72         [EQ_INTR]       = "intr",
  73         [EQ_LOG_PG_SZ]  = "log_page_size",
  74 };
  75
  76 enum {
  77         CQ_PID,
  78         CQ_NUM_CQES,
  79         CQ_LOG_PG_SZ,
  80 };
  81
  82 static char *cq_fields[] = {
  83         [CQ_PID]        = "pid",
  84         [CQ_NUM_CQES]   = "num_cqes",
  85         [CQ_LOG_PG_SZ]  = "log_page_size",
  86 };
  87
  88 struct dentry *mlx5_debugfs_root;
  89 EXPORT_SYMBOL(mlx5_debugfs_root);
  90
  91 void mlx5_register_debugfs(void)
  92 {
  93         mlx5_debugfs_root = debugfs_create_dir("mlx5", NULL);
  94         if (IS_ERR_OR_NULL(mlx5_debugfs_root))
  95                 mlx5_debugfs_root = NULL;
  96 }
  97
  98 void mlx5_unregister_debugfs(void)
  99 {
 100         debugfs_remove(mlx5_debugfs_root);
 101 }
 102
 103 int mlx5_qp_debugfs_init(struct mlx5_core_dev *dev)
 104 {
 105         if (!mlx5_debugfs_root)
 106                 return 0;
 107
 108         atomic_set(&dev->num_qps, 0);
 109
 110         dev->priv.qp_debugfs = debugfs_create_dir("QPs",  dev->priv.dbg_root);
 111         if (!dev->priv.qp_debugfs)
 112                 return -ENOMEM;
 113
 114         return 0;
 115 }
 116
 117 void mlx5_qp_debugfs_cleanup(struct mlx5_core_dev *dev)
 118 {
 119         if (!mlx5_debugfs_root)
 120                 return;
 121
 122         debugfs_remove_recursive(dev->priv.qp_debugfs);
 123 }
 124
 125 int mlx5_eq_debugfs_init(struct mlx5_core_dev *dev)
 126 {
 127         if (!mlx5_debugfs_root)
 128                 return 0;
 129
 130         dev->priv.eq_debugfs = debugfs_create_dir("EQs",  dev->priv.dbg_root);
 131         if (!dev->priv.eq_debugfs)
 132                 return -ENOMEM;
 133
 134         return 0;
 135 }
 136
 137 void mlx5_eq_debugfs_cleanup(struct mlx5_core_dev *dev)
 138 {
 139         if (!mlx5_debugfs_root)
 140                 return;
 141
 142         debugfs_remove_recursive(dev->priv.eq_debugfs);
 143 }
 144
 145 static ssize_t average_read(struct file *filp, char __user *buf, size_t count,
 146                             loff_t *pos)
 147 {
 148         struct mlx5_cmd_stats *stats;
 149         u64 field = 0;
 150         int ret;
 151         char tbuf[22];
 152
 153         if (*pos)
 154                 return 0;
 155
 156         stats = filp->private_data;
 157         spin_lock_irq(&stats->lock);
 158         if (stats->n)
 159                 field = div64_u64(stats->sum, stats->n);
 160         spin_unlock_irq(&stats->lock);
 161         ret = snprintf(tbuf, sizeof(tbuf), "%llu\n", field);
 162         if (ret > 0) {
 163                 if (copy_to_user(buf, tbuf, ret))
 164                         return -EFAULT;
 165         }
 166
 167         *pos += ret;
 168         return ret;
 169 }
 170
 171
 172 static ssize_t average_write(struct file *filp, const char __user *buf,
 173                              size_t count, loff_t *pos)
 174 {
 175         struct mlx5_cmd_stats *stats;
 176
 177         stats = filp->private_data;
 178         spin_lock_irq(&stats->lock);
 179         stats->sum = 0;
 180         stats->n = 0;
 181         spin_unlock_irq(&stats->lock);
 182
 183         *pos += count;
 184
 185         return count;
 186 }
 187
 188 static const struct file_operations stats_fops = {
 189         .owner  = THIS_MODULE,
 190         .open   = simple_open,
 191         .read   = average_read,
 192         .write  = average_write,
 193 };
 194
 195 int mlx5_cmdif_debugfs_init(struct mlx5_core_dev *dev)
 196 {
 197         struct mlx5_cmd_stats *stats;
 198         struct dentry **cmd;
 199         const char *namep;
 200         int err;
 201         int i;
 202
 203         if (!mlx5_debugfs_root)
 204                 return 0;
 205
 206         cmd = &dev->priv.cmdif_debugfs;
 207         *cmd = debugfs_create_dir("commands", dev->priv.dbg_root);
 208         if (!*cmd)
 209                 return -ENOMEM;
 210
 211         for (i = 0; i < ARRAY_SIZE(dev->cmd.stats); i++) {
 212                 stats = &dev->cmd.stats[i];
 213                 namep = mlx5_command_str(i);
 214                 if (strcmp(namep, "unknown command opcode")) {
 215                         stats->root = debugfs_create_dir(namep, *cmd);
 216                         if (!stats->root) {
 217                                 mlx5_core_warn(dev, "failed adding command %d\n",
 218                                                i);
 219                                 err = -ENOMEM;
 220                                 goto out;
 221                         }
 222
 223                         stats->avg = debugfs_create_file("average", 0400,
 224                                                          stats->root, stats,
 225                                                          &stats_fops);
 226                         if (!stats->avg) {
 227                                 mlx5_core_warn(dev, "failed creating debugfs file\n");
 228                                 err = -ENOMEM;
 229                                 goto out;
 230                         }
 231
 232                         stats->count = debugfs_create_u64("n", 0400,
 233                                                           stats->root,
 234                                                           &stats->n);
 235                         if (!stats->count) {
 236                                 mlx5_core_warn(dev, "failed creating debugfs file\n");
 237                                 err = -ENOMEM;
 238                                 goto out;
 239                         }
 240                 }
 241         }
 242
 243         return 0;
 244 out:
 245         debugfs_remove_recursive(dev->priv.cmdif_debugfs);
 246         return err;
 247 }
 248
 249 void mlx5_cmdif_debugfs_cleanup(struct mlx5_core_dev *dev)
 250 {
 251         if (!mlx5_debugfs_root)
 252                 return;
 253
 254         debugfs_remove_recursive(dev->priv.cmdif_debugfs);
 255 }
 256
 257 int mlx5_cq_debugfs_init(struct mlx5_core_dev *dev)
 258 {
 259         if (!mlx5_debugfs_root)
 260                 return 0;
 261
 262         dev->priv.cq_debugfs = debugfs_create_dir("CQs",  dev->priv.dbg_root);
 263         if (!dev->priv.cq_debugfs)
 264                 return -ENOMEM;
 265
 266         return 0;
 267 }
 268
 269 void mlx5_cq_debugfs_cleanup(struct mlx5_core_dev *dev)
 270 {
 271         if (!mlx5_debugfs_root)
 272                 return;
 273
 274         debugfs_remove_recursive(dev->priv.cq_debugfs);
 275 }
 276
 277 static u64 qp_read_field(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp,
 278                          int index, int *is_str)
 279 {
 280         struct mlx5_query_qp_mbox_out *out;
 281         struct mlx5_qp_context *ctx;
 282         u64 param = 0;
 283         int err;
 284         int no_sq;
 285
 286         out = kzalloc(sizeof(*out), GFP_KERNEL);
 287         if (!out)
 288                 return param;
 289
 290         err = mlx5_core_qp_query(dev, qp, out, sizeof(*out));
 291         if (err) {
 292                 mlx5_core_warn(dev, "failed to query qp\n");
 293                 goto out;
 294         }
 295
 296         *is_str = 0;
 297         ctx = &out->ctx;
 298         switch (index) {
 299         case QP_PID:
 300                 param = qp->pid;
 301                 break;
 302         case QP_STATE:
 303                 param = (unsigned long)mlx5_qp_state_str(be32_to_cpu(ctx->flags) >> 28);
 304                 *is_str = 1;
 305                 break;
 306         case QP_XPORT:
 307                 param = (unsigned long)mlx5_qp_type_str((be32_to_cpu(ctx->flags) >> 16) & 0xff);
 308                 *is_str = 1;
 309                 break;
 310         case QP_MTU:
 311                 switch (ctx->mtu_msgmax >> 5) {
 312                 case IB_MTU_256:
 313                         param = 256;
 314                         break;
 315                 case IB_MTU_512:
 316                         param = 512;
 317                         break;
 318                 case IB_MTU_1024:
 319                         param = 1024;
 320                         break;
 321                 case IB_MTU_2048:
 322                         param = 2048;
 323                         break;
 324                 case IB_MTU_4096:
 325                         param = 4096;
 326                         break;
 327                 default:
 328                         param = 0;
 329                 }
 330                 break;
 331         case QP_N_RECV:
 332                 param = 1 << ((ctx->rq_size_stride >> 3) & 0xf);
 333                 break;
 334         case QP_RECV_SZ:
 335                 param = 1 << ((ctx->rq_size_stride & 7) + 4);
 336                 break;
 337         case QP_N_SEND:
 338                 no_sq = be16_to_cpu(ctx->sq_crq_size) >> 15;
 339                 if (!no_sq)
 340                         param = 1 << (be16_to_cpu(ctx->sq_crq_size) >> 11);
 341                 else
 342                         param = 0;
 343                 break;
 344         case QP_LOG_PG_SZ:
 345                 param = (be32_to_cpu(ctx->log_pg_sz_remote_qpn) >> 24) & 0x1f;
 346                 param += 12;
 347                 break;
 348         case QP_RQPN:
 349                 param = be32_to_cpu(ctx->log_pg_sz_remote_qpn) & 0xffffff;
 350                 break;
 351         }
 352
 353 out:
 354         kfree(out);
 355         return param;
 356 }
 357
 358 static u64 eq_read_field(struct mlx5_core_dev *dev, struct mlx5_eq *eq,
 359                          int index)
 360 {
 361         struct mlx5_query_eq_mbox_out *out;
 362         struct mlx5_eq_context *ctx;
 363         u64 param = 0;
 364         int err;
 365
 366         out = kzalloc(sizeof(*out), GFP_KERNEL);
 367         if (!out)
 368                 return param;
 369
 370         ctx = &out->ctx;
 371
 372         err = mlx5_core_eq_query(dev, eq, out, sizeof(*out));
 373         if (err) {
 374                 mlx5_core_warn(dev, "failed to query eq\n");
 375                 goto out;
 376         }
 377
 378         switch (index) {
 379         case EQ_NUM_EQES:
 380                 param = 1 << ((be32_to_cpu(ctx->log_sz_usr_page) >> 24) & 0x1f);
 381                 break;
 382         case EQ_INTR:
 383                 param = ctx->intr;
 384                 break;
 385         case EQ_LOG_PG_SZ:
 386                 param = (ctx->log_page_size & 0x1f) + 12;
 387                 break;
 388         }
 389
 390 out:
 391         kfree(out);
 392         return param;
 393 }
 394
 395 static u64 cq_read_field(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 396                          int index)
 397 {
 398         struct mlx5_query_cq_mbox_out *out;
 399         struct mlx5_cq_context *ctx;
 400         u64 param = 0;
 401         int err;
 402
 403         out = kzalloc(sizeof(*out), GFP_KERNEL);
 404         if (!out)
 405                 return param;
 406
 407         ctx = &out->ctx;
 408
 409         err = mlx5_core_query_cq(dev, cq, out);
 410         if (err) {
 411                 mlx5_core_warn(dev, "failed to query cq\n");
 412                 goto out;
 413         }
 414
 415         switch (index) {
 416         case CQ_PID:
 417                 param = cq->pid;
 418                 break;
 419         case CQ_NUM_CQES:
 420                 param = 1 << ((be32_to_cpu(ctx->log_sz_usr_page) >> 24) & 0x1f);
 421                 break;
 422         case CQ_LOG_PG_SZ:
 423                 param = (ctx->log_pg_sz & 0x1f) + 12;
 424                 break;
 425         }
 426
 427 out:
 428         kfree(out);
 429         return param;
 430 }
 431
 432 static ssize_t dbg_read(struct file *filp, char __user *buf, size_t count,
 433                         loff_t *pos)
 434 {
 435         struct mlx5_field_desc *desc;
 436         struct mlx5_rsc_debug *d;
 437         char tbuf[18];
 438         int is_str = 0;
 439         u64 field;
 440         int ret;
 441
 442         if (*pos)
 443                 return 0;
 444
 445         desc = filp->private_data;
 446         d = (void *)(desc - desc->i) - sizeof(*d);
 447         switch (d->type) {
 448         case MLX5_DBG_RSC_QP:
 449                 field = qp_read_field(d->dev, d->object, desc->i, &is_str);
 450                 break;
 451
 452         case MLX5_DBG_RSC_EQ:
 453                 field = eq_read_field(d->dev, d->object, desc->i);
 454                 break;
 455
 456         case MLX5_DBG_RSC_CQ:
 457                 field = cq_read_field(d->dev, d->object, desc->i);
 458                 break;
 459
 460         default:
 461                 mlx5_core_warn(d->dev, "invalid resource type %d\n", d->type);
 462                 return -EINVAL;
 463         }
 464
 465
 466         if (is_str)
 467                 ret = snprintf(tbuf, sizeof(tbuf), "%s\n", (const char *)(unsigned long)field);
 468         else
 469                 ret = snprintf(tbuf, sizeof(tbuf), "0x%llx\n", field);
 470
 471         if (ret > 0) {
 472                 if (copy_to_user(buf, tbuf, ret))
 473                         return -EFAULT;
 474         }
 475
 476         *pos += ret;
 477         return ret;
 478 }
 479
 480 static const struct file_operations fops = {
 481         .owner  = THIS_MODULE,
 482         .open   = simple_open,
 483         .read   = dbg_read,
 484 };
 485
 486 static int add_res_tree(struct mlx5_core_dev *dev, enum dbg_rsc_type type,
 487                         struct dentry *root, struct mlx5_rsc_debug **dbg,
 488                         int rsn, char **field, int nfile, void *data)
 489 {
 490         struct mlx5_rsc_debug *d;
 491         char resn[32];
 492         int err;
 493         int i;
 494
 495         d = kzalloc(sizeof(*d) + nfile * sizeof(d->fields[0]), GFP_KERNEL);
 496         if (!d)
 497                 return -ENOMEM;
 498
 499         d->dev = dev;
 500         d->object = data;
 501         d->type = type;
 502         sprintf(resn, "0x%x", rsn);
 503         d->root = debugfs_create_dir(resn,  root);
 504         if (!d->root) {
 505                 err = -ENOMEM;
 506                 goto out_free;
 507         }
 508
 509         for (i = 0; i < nfile; i++) {
 510                 d->fields[i].i = i;
 511                 d->fields[i].dent = debugfs_create_file(field[i], 0400,
 512                                                         d->root, &d->fields[i],
 513                                                         &fops);
 514                 if (!d->fields[i].dent) {
 515                         err = -ENOMEM;
 516                         goto out_rem;
 517                 }
 518         }
 519         *dbg = d;
 520
 521         return 0;
 522 out_rem:
 523         debugfs_remove_recursive(d->root);
 524
 525 out_free:
 526         kfree(d);
 527         return err;
 528 }
 529
 530 static void rem_res_tree(struct mlx5_rsc_debug *d)
 531 {
 532         debugfs_remove_recursive(d->root);
 533         kfree(d);
 534 }
 535
 536 int mlx5_debug_qp_add(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp)
 537 {
 538         int err;
 539
 540         if (!mlx5_debugfs_root)
 541                 return 0;
 542
 543         err = add_res_tree(dev, MLX5_DBG_RSC_QP, dev->priv.qp_debugfs,
 544                            &qp->dbg, qp->qpn, qp_fields,
 545                            ARRAY_SIZE(qp_fields), qp);
 546         if (err)
 547                 qp->dbg = NULL;
 548
 549         return err;
 550 }
 551
 552 void mlx5_debug_qp_remove(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp)
 553 {
 554         if (!mlx5_debugfs_root)
 555                 return;
 556
 557         if (qp->dbg)
 558                 rem_res_tree(qp->dbg);
 559 }
 560
 561
 562 int mlx5_debug_eq_add(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
 563 {
 564         int err;
 565
 566         if (!mlx5_debugfs_root)
 567                 return 0;
 568
 569         err = add_res_tree(dev, MLX5_DBG_RSC_EQ, dev->priv.eq_debugfs,
 570                            &eq->dbg, eq->eqn, eq_fields,
 571                            ARRAY_SIZE(eq_fields), eq);
 572         if (err)
 573                 eq->dbg = NULL;
 574
 575         return err;
 576 }
 577
 578 void mlx5_debug_eq_remove(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
 579 {
 580         if (!mlx5_debugfs_root)
 581                 return;
 582
 583         if (eq->dbg)
 584                 rem_res_tree(eq->dbg);
 585 }
 586
 587 int mlx5_debug_cq_add(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 588 {
 589         int err;
 590
 591         if (!mlx5_debugfs_root)
 592                 return 0;
 593
 594         err = add_res_tree(dev, MLX5_DBG_RSC_CQ, dev->priv.cq_debugfs,
 595                            &cq->dbg, cq->cqn, cq_fields,
 596                            ARRAY_SIZE(cq_fields), cq);
 597         if (err)
 598                 cq->dbg = NULL;
 599
 600         return err;
 601 }
 602
 603 void mlx5_debug_cq_remove(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 604 {
 605         if (!mlx5_debugfs_root)
 606                 return;
 607
 608         if (cq->dbg)
 609                 rem_res_tree(cq->dbg);
 610 }