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 static ssize_t average_write(struct file *filp, const char __user *buf,
 172                              size_t count, loff_t *pos)
 173 {
 174         struct mlx5_cmd_stats *stats;
 175
 176         stats = filp->private_data;
 177         spin_lock_irq(&stats->lock);
 178         stats->sum = 0;
 179         stats->n = 0;
 180         spin_unlock_irq(&stats->lock);
 181
 182         *pos += count;
 183
 184         return count;
 185 }
 186
 187 static const struct file_operations stats_fops = {
 188         .owner  = THIS_MODULE,
 189         .open   = simple_open,
 190         .read   = average_read,
 191         .write  = average_write,
 192 };
 193
 194 int mlx5_cmdif_debugfs_init(struct mlx5_core_dev *dev)
 195 {
 196         struct mlx5_cmd_stats *stats;
 197         struct dentry **cmd;
 198         const char *namep;
 199         int err;
 200         int i;
 201
 202         if (!mlx5_debugfs_root)
 203                 return 0;
 204
 205         cmd = &dev->priv.cmdif_debugfs;
 206         *cmd = debugfs_create_dir("commands", dev->priv.dbg_root);
 207         if (!*cmd)
 208                 return -ENOMEM;
 209
 210         for (i = 0; i < ARRAY_SIZE(dev->cmd.stats); i++) {
 211                 stats = &dev->cmd.stats[i];
 212                 namep = mlx5_command_str(i);
 213                 if (strcmp(namep, "unknown command opcode")) {
 214                         stats->root = debugfs_create_dir(namep, *cmd);
 215                         if (!stats->root) {
 216                                 mlx5_core_warn(dev, "failed adding command %d\n",
 217                                                i);
 218                                 err = -ENOMEM;
 219                                 goto out;
 220                         }
 221
 222                         stats->avg = debugfs_create_file("average", 0400,
 223                                                          stats->root, stats,
 224                                                          &stats_fops);
 225                         if (!stats->avg) {
 226                                 mlx5_core_warn(dev, "failed creating debugfs file\n");
 227                                 err = -ENOMEM;
 228                                 goto out;
 229                         }
 230
 231                         stats->count = debugfs_create_u64("n", 0400,
 232                                                           stats->root,
 233                                                           &stats->n);
 234                         if (!stats->count) {
 235                                 mlx5_core_warn(dev, "failed creating debugfs file\n");
 236                                 err = -ENOMEM;
 237                                 goto out;
 238                         }
 239                 }
 240         }
 241
 242         return 0;
 243 out:
 244         debugfs_remove_recursive(dev->priv.cmdif_debugfs);
 245         return err;
 246 }
 247
 248 void mlx5_cmdif_debugfs_cleanup(struct mlx5_core_dev *dev)
 249 {
 250         if (!mlx5_debugfs_root)
 251                 return;
 252
 253         debugfs_remove_recursive(dev->priv.cmdif_debugfs);
 254 }
 255
 256 int mlx5_cq_debugfs_init(struct mlx5_core_dev *dev)
 257 {
 258         if (!mlx5_debugfs_root)
 259                 return 0;
 260
 261         dev->priv.cq_debugfs = debugfs_create_dir("CQs",  dev->priv.dbg_root);
 262         if (!dev->priv.cq_debugfs)
 263                 return -ENOMEM;
 264
 265         return 0;
 266 }
 267
 268 void mlx5_cq_debugfs_cleanup(struct mlx5_core_dev *dev)
 269 {
 270         if (!mlx5_debugfs_root)
 271                 return;
 272
 273         debugfs_remove_recursive(dev->priv.cq_debugfs);
 274 }
 275
 276 static u64 qp_read_field(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp,
 277                          int index, int *is_str)
 278 {
 279         int outlen = MLX5_ST_SZ_BYTES(query_qp_out);
 280         struct mlx5_qp_context *ctx;
 281         u64 param = 0;
 282         u32 *out;
 283         int err;
 284         int no_sq;
 285
 286         out = kzalloc(outlen, GFP_KERNEL);
 287         if (!out)
 288                 return param;
 289
 290         err = mlx5_core_qp_query(dev, qp, out, outlen);
 291         if (err) {
 292                 mlx5_core_warn(dev, "failed to query qp err=%d\n", err);
 293                 goto out;
 294         }
 295
 296         *is_str = 0;
 297
 298         /* FIXME: use MLX5_GET rather than mlx5_qp_context manual struct */
 299         ctx = (struct mlx5_qp_context *)MLX5_ADDR_OF(query_qp_out, out, qpc);
 300
 301         switch (index) {
 302         case QP_PID:
 303                 param = qp->pid;
 304                 break;
 305         case QP_STATE:
 306                 param = (unsigned long)mlx5_qp_state_str(be32_to_cpu(ctx->flags) >> 28);
 307                 *is_str = 1;
 308                 break;
 309         case QP_XPORT:
 310                 param = (unsigned long)mlx5_qp_type_str((be32_to_cpu(ctx->flags) >> 16) & 0xff);
 311                 *is_str = 1;
 312                 break;
 313         case QP_MTU:
 314                 switch (ctx->mtu_msgmax >> 5) {
 315                 case IB_MTU_256:
 316                         param = 256;
 317                         break;
 318                 case IB_MTU_512:
 319                         param = 512;
 320                         break;
 321                 case IB_MTU_1024:
 322                         param = 1024;
 323                         break;
 324                 case IB_MTU_2048:
 325                         param = 2048;
 326                         break;
 327                 case IB_MTU_4096:
 328                         param = 4096;
 329                         break;
 330                 default:
 331                         param = 0;
 332                 }
 333                 break;
 334         case QP_N_RECV:
 335                 param = 1 << ((ctx->rq_size_stride >> 3) & 0xf);
 336                 break;
 337         case QP_RECV_SZ:
 338                 param = 1 << ((ctx->rq_size_stride & 7) + 4);
 339                 break;
 340         case QP_N_SEND:
 341                 no_sq = be16_to_cpu(ctx->sq_crq_size) >> 15;
 342                 if (!no_sq)
 343                         param = 1 << (be16_to_cpu(ctx->sq_crq_size) >> 11);
 344                 else
 345                         param = 0;
 346                 break;
 347         case QP_LOG_PG_SZ:
 348                 param = (be32_to_cpu(ctx->log_pg_sz_remote_qpn) >> 24) & 0x1f;
 349                 param += 12;
 350                 break;
 351         case QP_RQPN:
 352                 param = be32_to_cpu(ctx->log_pg_sz_remote_qpn) & 0xffffff;
 353                 break;
 354         }
 355
 356 out:
 357         kfree(out);
 358         return param;
 359 }
 360
 361 static u64 eq_read_field(struct mlx5_core_dev *dev, struct mlx5_eq *eq,
 362                          int index)
 363 {
 364         int outlen = MLX5_ST_SZ_BYTES(query_eq_out);
 365         u64 param = 0;
 366         void *ctx;
 367         u32 *out;
 368         int err;
 369
 370         out = kzalloc(outlen, GFP_KERNEL);
 371         if (!out)
 372                 return param;
 373
 374         err = mlx5_core_eq_query(dev, eq, out, outlen);
 375         if (err) {
 376                 mlx5_core_warn(dev, "failed to query eq\n");
 377                 goto out;
 378         }
 379         ctx = MLX5_ADDR_OF(query_eq_out, out, eq_context_entry);
 380
 381         switch (index) {
 382         case EQ_NUM_EQES:
 383                 param = 1 << MLX5_GET(eqc, ctx, log_eq_size);
 384                 break;
 385         case EQ_INTR:
 386                 param = MLX5_GET(eqc, ctx, intr);
 387                 break;
 388         case EQ_LOG_PG_SZ:
 389                 param = MLX5_GET(eqc, ctx, log_page_size) + 12;
 390                 break;
 391         }
 392
 393 out:
 394         kfree(out);
 395         return param;
 396 }
 397
 398 static u64 cq_read_field(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 399                          int index)
 400 {
 401         int outlen = MLX5_ST_SZ_BYTES(query_cq_out);
 402         u64 param = 0;
 403         void *ctx;
 404         u32 *out;
 405         int err;
 406
 407         out = kvzalloc(outlen, GFP_KERNEL);
 408         if (!out)
 409                 return param;
 410
 411         err = mlx5_core_query_cq(dev, cq, out, outlen);
 412         if (err) {
 413                 mlx5_core_warn(dev, "failed to query cq\n");
 414                 goto out;
 415         }
 416         ctx = MLX5_ADDR_OF(query_cq_out, out, cq_context);
 417
 418         switch (index) {
 419         case CQ_PID:
 420                 param = cq->pid;
 421                 break;
 422         case CQ_NUM_CQES:
 423                 param = 1 << MLX5_GET(cqc, ctx, log_cq_size);
 424                 break;
 425         case CQ_LOG_PG_SZ:
 426                 param = MLX5_GET(cqc, ctx, log_page_size);
 427                 break;
 428         }
 429
 430 out:
 431         kvfree(out);
 432         return param;
 433 }
 434
 435 static ssize_t dbg_read(struct file *filp, char __user *buf, size_t count,
 436                         loff_t *pos)
 437 {
 438         struct mlx5_field_desc *desc;
 439         struct mlx5_rsc_debug *d;
 440         char tbuf[18];
 441         int is_str = 0;
 442         u64 field;
 443         int ret;
 444
 445         if (*pos)
 446                 return 0;
 447
 448         desc = filp->private_data;
 449         d = (void *)(desc - desc->i) - sizeof(*d);
 450         switch (d->type) {
 451         case MLX5_DBG_RSC_QP:
 452                 field = qp_read_field(d->dev, d->object, desc->i, &is_str);
 453                 break;
 454
 455         case MLX5_DBG_RSC_EQ:
 456                 field = eq_read_field(d->dev, d->object, desc->i);
 457                 break;
 458
 459         case MLX5_DBG_RSC_CQ:
 460                 field = cq_read_field(d->dev, d->object, desc->i);
 461                 break;
 462
 463         default:
 464                 mlx5_core_warn(d->dev, "invalid resource type %d\n", d->type);
 465                 return -EINVAL;
 466         }
 467
 468         if (is_str)
 469                 ret = snprintf(tbuf, sizeof(tbuf), "%s\n", (const char *)(unsigned long)field);
 470         else
 471                 ret = snprintf(tbuf, sizeof(tbuf), "0x%llx\n", field);
 472
 473         if (ret > 0) {
 474                 if (copy_to_user(buf, tbuf, ret))
 475                         return -EFAULT;
 476         }
 477
 478         *pos += ret;
 479         return ret;
 480 }
 481
 482 static const struct file_operations fops = {
 483         .owner  = THIS_MODULE,
 484         .open   = simple_open,
 485         .read   = dbg_read,
 486 };
 487
 488 static int add_res_tree(struct mlx5_core_dev *dev, enum dbg_rsc_type type,
 489                         struct dentry *root, struct mlx5_rsc_debug **dbg,
 490                         int rsn, char **field, int nfile, void *data)
 491 {
 492         struct mlx5_rsc_debug *d;
 493         char resn[32];
 494         int err;
 495         int i;
 496
 497         d = kzalloc(sizeof(*d) + nfile * sizeof(d->fields[0]), GFP_KERNEL);
 498         if (!d)
 499                 return -ENOMEM;
 500
 501         d->dev = dev;
 502         d->object = data;
 503         d->type = type;
 504         sprintf(resn, "0x%x", rsn);
 505         d->root = debugfs_create_dir(resn,  root);
 506         if (!d->root) {
 507                 err = -ENOMEM;
 508                 goto out_free;
 509         }
 510
 511         for (i = 0; i < nfile; i++) {
 512                 d->fields[i].i = i;
 513                 d->fields[i].dent = debugfs_create_file(field[i], 0400,
 514                                                         d->root, &d->fields[i],
 515                                                         &fops);
 516                 if (!d->fields[i].dent) {
 517                         err = -ENOMEM;
 518                         goto out_rem;
 519                 }
 520         }
 521         *dbg = d;
 522
 523         return 0;
 524 out_rem:
 525         debugfs_remove_recursive(d->root);
 526
 527 out_free:
 528         kfree(d);
 529         return err;
 530 }
 531
 532 static void rem_res_tree(struct mlx5_rsc_debug *d)
 533 {
 534         debugfs_remove_recursive(d->root);
 535         kfree(d);
 536 }
 537
 538 int mlx5_debug_qp_add(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp)
 539 {
 540         int err;
 541
 542         if (!mlx5_debugfs_root)
 543                 return 0;
 544
 545         err = add_res_tree(dev, MLX5_DBG_RSC_QP, dev->priv.qp_debugfs,
 546                            &qp->dbg, qp->qpn, qp_fields,
 547                            ARRAY_SIZE(qp_fields), qp);
 548         if (err)
 549                 qp->dbg = NULL;
 550
 551         return err;
 552 }
 553
 554 void mlx5_debug_qp_remove(struct mlx5_core_dev *dev, struct mlx5_core_qp *qp)
 555 {
 556         if (!mlx5_debugfs_root)
 557                 return;
 558
 559         if (qp->dbg)
 560                 rem_res_tree(qp->dbg);
 561 }
 562
 563 int mlx5_debug_eq_add(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
 564 {
 565         int err;
 566
 567         if (!mlx5_debugfs_root)
 568                 return 0;
 569
 570         err = add_res_tree(dev, MLX5_DBG_RSC_EQ, dev->priv.eq_debugfs,
 571                            &eq->dbg, eq->eqn, eq_fields,
 572                            ARRAY_SIZE(eq_fields), eq);
 573         if (err)
 574                 eq->dbg = NULL;
 575
 576         return err;
 577 }
 578
 579 void mlx5_debug_eq_remove(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
 580 {
 581         if (!mlx5_debugfs_root)
 582                 return;
 583
 584         if (eq->dbg)
 585                 rem_res_tree(eq->dbg);
 586 }
 587
 588 int mlx5_debug_cq_add(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 589 {
 590         int err;
 591
 592         if (!mlx5_debugfs_root)
 593                 return 0;
 594
 595         err = add_res_tree(dev, MLX5_DBG_RSC_CQ, dev->priv.cq_debugfs,
 596                            &cq->dbg, cq->cqn, cq_fields,
 597                            ARRAY_SIZE(cq_fields), cq);
 598         if (err)
 599                 cq->dbg = NULL;
 600
 601         return err;
 602 }
 603
 604 void mlx5_debug_cq_remove(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 605 {
 606         if (!mlx5_debugfs_root)
 607                 return;
 608
 609         if (cq->dbg)
 610                 rem_res_tree(cq->dbg);
 611 }