kernel/drivers/net/ethernet/brocade/bna/bnad_debugfs.c

   1 /*
   2  * Linux network driver for QLogic BR-series Converged Network Adapter.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License (GPL) Version 2 as
   6  * published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 /*
  14  * Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
  15  * Copyright (c) 2014-2015 QLogic Corporation
  16  * All rights reserved
  17  * www.qlogic.com
  18  */
  19
  20 #include <linux/debugfs.h>
  21 #include <linux/module.h>
  22 #include "bnad.h"
  23
  24 /*
  25  * BNA debufs interface
  26  *
  27  * To access the interface, debugfs file system should be mounted
  28  * if not already mounted using:
  29  *      mount -t debugfs none /sys/kernel/debug
  30  *
  31  * BNA Hierarchy:
  32  *      - bna/pci_dev:<pci_name>
  33  * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bna
  34  *
  35  * Debugging service available per pci_dev:
  36  *      fwtrc:  To collect current firmware trace.
  37  *      fwsave: To collect last saved fw trace as a result of firmware crash.
  38  *      regwr:  To write one word to chip register
  39  *      regrd:  To read one or more words from chip register.
  40  */
  41
  42 struct bnad_debug_info {
  43         char *debug_buffer;
  44         void *i_private;
  45         int buffer_len;
  46 };
  47
  48 static int
  49 bnad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
  50 {
  51         struct bnad *bnad = inode->i_private;
  52         struct bnad_debug_info *fw_debug;
  53         unsigned long flags;
  54         int rc;
  55
  56         fw_debug = kzalloc(sizeof(struct bnad_debug_info), GFP_KERNEL);
  57         if (!fw_debug)
  58                 return -ENOMEM;
  59
  60         fw_debug->buffer_len = BNA_DBG_FWTRC_LEN;
  61
  62         fw_debug->debug_buffer = kzalloc(fw_debug->buffer_len, GFP_KERNEL);
  63         if (!fw_debug->debug_buffer) {
  64                 kfree(fw_debug);
  65                 fw_debug = NULL;
  66                 return -ENOMEM;
  67         }
  68
  69         spin_lock_irqsave(&bnad->bna_lock, flags);
  70         rc = bfa_nw_ioc_debug_fwtrc(&bnad->bna.ioceth.ioc,
  71                         fw_debug->debug_buffer,
  72                         &fw_debug->buffer_len);
  73         spin_unlock_irqrestore(&bnad->bna_lock, flags);
  74         if (rc != BFA_STATUS_OK) {
  75                 kfree(fw_debug->debug_buffer);
  76                 fw_debug->debug_buffer = NULL;
  77                 kfree(fw_debug);
  78                 fw_debug = NULL;
  79                 netdev_warn(bnad->netdev, "failed to collect fwtrc\n");
  80                 return -ENOMEM;
  81         }
  82
  83         file->private_data = fw_debug;
  84
  85         return 0;
  86 }
  87
  88 static int
  89 bnad_debugfs_open_fwsave(struct inode *inode, struct file *file)
  90 {
  91         struct bnad *bnad = inode->i_private;
  92         struct bnad_debug_info *fw_debug;
  93         unsigned long flags;
  94         int rc;
  95
  96         fw_debug = kzalloc(sizeof(struct bnad_debug_info), GFP_KERNEL);
  97         if (!fw_debug)
  98                 return -ENOMEM;
  99
 100         fw_debug->buffer_len = BNA_DBG_FWTRC_LEN;
 101
 102         fw_debug->debug_buffer = kzalloc(fw_debug->buffer_len, GFP_KERNEL);
 103         if (!fw_debug->debug_buffer) {
 104                 kfree(fw_debug);
 105                 fw_debug = NULL;
 106                 return -ENOMEM;
 107         }
 108
 109         spin_lock_irqsave(&bnad->bna_lock, flags);
 110         rc = bfa_nw_ioc_debug_fwsave(&bnad->bna.ioceth.ioc,
 111                         fw_debug->debug_buffer,
 112                         &fw_debug->buffer_len);
 113         spin_unlock_irqrestore(&bnad->bna_lock, flags);
 114         if (rc != BFA_STATUS_OK && rc != BFA_STATUS_ENOFSAVE) {
 115                 kfree(fw_debug->debug_buffer);
 116                 fw_debug->debug_buffer = NULL;
 117                 kfree(fw_debug);
 118                 fw_debug = NULL;
 119                 netdev_warn(bnad->netdev, "failed to collect fwsave\n");
 120                 return -ENOMEM;
 121         }
 122
 123         file->private_data = fw_debug;
 124
 125         return 0;
 126 }
 127
 128 static int
 129 bnad_debugfs_open_reg(struct inode *inode, struct file *file)
 130 {
 131         struct bnad_debug_info *reg_debug;
 132
 133         reg_debug = kzalloc(sizeof(struct bnad_debug_info), GFP_KERNEL);
 134         if (!reg_debug)
 135                 return -ENOMEM;
 136
 137         reg_debug->i_private = inode->i_private;
 138
 139         file->private_data = reg_debug;
 140
 141         return 0;
 142 }
 143
 144 static int
 145 bnad_get_debug_drvinfo(struct bnad *bnad, void *buffer, u32 len)
 146 {
 147         struct bnad_drvinfo *drvinfo = (struct bnad_drvinfo *) buffer;
 148         struct bnad_iocmd_comp fcomp;
 149         unsigned long flags = 0;
 150         int ret = BFA_STATUS_FAILED;
 151
 152         /* Get IOC info */
 153         spin_lock_irqsave(&bnad->bna_lock, flags);
 154         bfa_nw_ioc_get_attr(&bnad->bna.ioceth.ioc, &drvinfo->ioc_attr);
 155         spin_unlock_irqrestore(&bnad->bna_lock, flags);
 156
 157         /* Retrieve CEE related info */
 158         fcomp.bnad = bnad;
 159         fcomp.comp_status = 0;
 160         init_completion(&fcomp.comp);
 161         spin_lock_irqsave(&bnad->bna_lock, flags);
 162         ret = bfa_nw_cee_get_attr(&bnad->bna.cee, &drvinfo->cee_attr,
 163                                 bnad_cb_completion, &fcomp);
 164         if (ret != BFA_STATUS_OK) {
 165                 spin_unlock_irqrestore(&bnad->bna_lock, flags);
 166                 goto out;
 167         }
 168         spin_unlock_irqrestore(&bnad->bna_lock, flags);
 169         wait_for_completion(&fcomp.comp);
 170         drvinfo->cee_status = fcomp.comp_status;
 171
 172         /* Retrieve flash partition info */
 173         fcomp.comp_status = 0;
 174         reinit_completion(&fcomp.comp);
 175         spin_lock_irqsave(&bnad->bna_lock, flags);
 176         ret = bfa_nw_flash_get_attr(&bnad->bna.flash, &drvinfo->flash_attr,
 177                                 bnad_cb_completion, &fcomp);
 178         if (ret != BFA_STATUS_OK) {
 179                 spin_unlock_irqrestore(&bnad->bna_lock, flags);
 180                 goto out;
 181         }
 182         spin_unlock_irqrestore(&bnad->bna_lock, flags);
 183         wait_for_completion(&fcomp.comp);
 184         drvinfo->flash_status = fcomp.comp_status;
 185 out:
 186         return ret;
 187 }
 188
 189 static int
 190 bnad_debugfs_open_drvinfo(struct inode *inode, struct file *file)
 191 {
 192         struct bnad *bnad = inode->i_private;
 193         struct bnad_debug_info *drv_info;
 194         int rc;
 195
 196         drv_info = kzalloc(sizeof(struct bnad_debug_info), GFP_KERNEL);
 197         if (!drv_info)
 198                 return -ENOMEM;
 199
 200         drv_info->buffer_len = sizeof(struct bnad_drvinfo);
 201
 202         drv_info->debug_buffer = kzalloc(drv_info->buffer_len, GFP_KERNEL);
 203         if (!drv_info->debug_buffer) {
 204                 kfree(drv_info);
 205                 drv_info = NULL;
 206                 return -ENOMEM;
 207         }
 208
 209         mutex_lock(&bnad->conf_mutex);
 210         rc = bnad_get_debug_drvinfo(bnad, drv_info->debug_buffer,
 211                                 drv_info->buffer_len);
 212         mutex_unlock(&bnad->conf_mutex);
 213         if (rc != BFA_STATUS_OK) {
 214                 kfree(drv_info->debug_buffer);
 215                 drv_info->debug_buffer = NULL;
 216                 kfree(drv_info);
 217                 drv_info = NULL;
 218                 netdev_warn(bnad->netdev, "failed to collect drvinfo\n");
 219                 return -ENOMEM;
 220         }
 221
 222         file->private_data = drv_info;
 223
 224         return 0;
 225 }
 226
 227 /* Changes the current file position */
 228 static loff_t
 229 bnad_debugfs_lseek(struct file *file, loff_t offset, int orig)
 230 {
 231         struct bnad_debug_info *debug = file->private_data;
 232
 233         if (!debug)
 234                 return -EINVAL;
 235
 236         return fixed_size_llseek(file, offset, orig, debug->buffer_len);
 237 }
 238
 239 static ssize_t
 240 bnad_debugfs_read(struct file *file, char __user *buf,
 241                   size_t nbytes, loff_t *pos)
 242 {
 243         struct bnad_debug_info *debug = file->private_data;
 244
 245         if (!debug || !debug->debug_buffer)
 246                 return 0;
 247
 248         return simple_read_from_buffer(buf, nbytes, pos,
 249                                 debug->debug_buffer, debug->buffer_len);
 250 }
 251
 252 #define BFA_REG_CT_ADDRSZ       (0x40000)
 253 #define BFA_REG_CB_ADDRSZ       (0x20000)
 254 #define BFA_REG_ADDRSZ(__ioc)   \
 255         ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ?  \
 256          BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
 257 #define BFA_REG_ADDRMSK(__ioc)  (BFA_REG_ADDRSZ(__ioc) - 1)
 258
 259 /*
 260  * Function to check if the register offset passed is valid.
 261  */
 262 static int
 263 bna_reg_offset_check(struct bfa_ioc *ioc, u32 offset, u32 len)
 264 {
 265         u8 area;
 266
 267         /* check [16:15] */
 268         area = (offset >> 15) & 0x7;
 269         if (area == 0) {
 270                 /* PCIe core register */
 271                 if (offset + (len << 2) > 0x8000)       /* 8k dwords or 32KB */
 272                         return BFA_STATUS_EINVAL;
 273         } else if (area == 0x1) {
 274                 /* CB 32 KB memory page */
 275                 if (offset + (len << 2) > 0x10000)      /* 8k dwords or 32KB */
 276                         return BFA_STATUS_EINVAL;
 277         } else {
 278                 /* CB register space 64KB */
 279                 if (offset + (len << 2) > BFA_REG_ADDRMSK(ioc))
 280                         return BFA_STATUS_EINVAL;
 281         }
 282         return BFA_STATUS_OK;
 283 }
 284
 285 static ssize_t
 286 bnad_debugfs_read_regrd(struct file *file, char __user *buf,
 287                         size_t nbytes, loff_t *pos)
 288 {
 289         struct bnad_debug_info *regrd_debug = file->private_data;
 290         struct bnad *bnad = (struct bnad *)regrd_debug->i_private;
 291         ssize_t rc;
 292
 293         if (!bnad->regdata)
 294                 return 0;
 295
 296         rc = simple_read_from_buffer(buf, nbytes, pos,
 297                         bnad->regdata, bnad->reglen);
 298
 299         if ((*pos + nbytes) >= bnad->reglen) {
 300                 kfree(bnad->regdata);
 301                 bnad->regdata = NULL;
 302                 bnad->reglen = 0;
 303         }
 304
 305         return rc;
 306 }
 307
 308 static ssize_t
 309 bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
 310                 size_t nbytes, loff_t *ppos)
 311 {
 312         struct bnad_debug_info *regrd_debug = file->private_data;
 313         struct bnad *bnad = (struct bnad *)regrd_debug->i_private;
 314         struct bfa_ioc *ioc = &bnad->bna.ioceth.ioc;
 315         int addr, len, rc, i;
 316         u32 *regbuf;
 317         void __iomem *rb, *reg_addr;
 318         unsigned long flags;
 319         void *kern_buf;
 320
 321         /* Copy the user space buf */
 322         kern_buf = memdup_user(buf, nbytes);
 323         if (IS_ERR(kern_buf))
 324                 return PTR_ERR(kern_buf);
 325
 326         rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 327         if (rc < 2) {
 328                 netdev_warn(bnad->netdev, "failed to read user buffer\n");
 329                 kfree(kern_buf);
 330                 return -EINVAL;
 331         }
 332
 333         kfree(kern_buf);
 334         kfree(bnad->regdata);
 335         bnad->reglen = 0;
 336
 337         bnad->regdata = kzalloc(len << 2, GFP_KERNEL);
 338         if (!bnad->regdata)
 339                 return -ENOMEM;
 340
 341         bnad->reglen = len << 2;
 342         rb = bfa_ioc_bar0(ioc);
 343         addr &= BFA_REG_ADDRMSK(ioc);
 344
 345         /* offset and len sanity check */
 346         rc = bna_reg_offset_check(ioc, addr, len);
 347         if (rc) {
 348                 netdev_warn(bnad->netdev, "failed reg offset check\n");
 349                 kfree(bnad->regdata);
 350                 bnad->regdata = NULL;
 351                 bnad->reglen = 0;
 352                 return -EINVAL;
 353         }
 354
 355         reg_addr = rb + addr;
 356         regbuf =  (u32 *)bnad->regdata;
 357         spin_lock_irqsave(&bnad->bna_lock, flags);
 358         for (i = 0; i < len; i++) {
 359                 *regbuf = readl(reg_addr);
 360                 regbuf++;
 361                 reg_addr += sizeof(u32);
 362         }
 363         spin_unlock_irqrestore(&bnad->bna_lock, flags);
 364
 365         return nbytes;
 366 }
 367
 368 static ssize_t
 369 bnad_debugfs_write_regwr(struct file *file, const char __user *buf,
 370                 size_t nbytes, loff_t *ppos)
 371 {
 372         struct bnad_debug_info *debug = file->private_data;
 373         struct bnad *bnad = (struct bnad *)debug->i_private;
 374         struct bfa_ioc *ioc = &bnad->bna.ioceth.ioc;
 375         int addr, val, rc;
 376         void __iomem *reg_addr;
 377         unsigned long flags;
 378         void *kern_buf;
 379
 380         /* Copy the user space buf */
 381         kern_buf = memdup_user(buf, nbytes);
 382         if (IS_ERR(kern_buf))
 383                 return PTR_ERR(kern_buf);
 384
 385         rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 386         if (rc < 2) {
 387                 netdev_warn(bnad->netdev, "failed to read user buffer\n");
 388                 kfree(kern_buf);
 389                 return -EINVAL;
 390         }
 391         kfree(kern_buf);
 392
 393         addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
 394
 395         /* offset and len sanity check */
 396         rc = bna_reg_offset_check(ioc, addr, 1);
 397         if (rc) {
 398                 netdev_warn(bnad->netdev, "failed reg offset check\n");
 399                 return -EINVAL;
 400         }
 401
 402         reg_addr = (bfa_ioc_bar0(ioc)) + addr;
 403         spin_lock_irqsave(&bnad->bna_lock, flags);
 404         writel(val, reg_addr);
 405         spin_unlock_irqrestore(&bnad->bna_lock, flags);
 406
 407         return nbytes;
 408 }
 409
 410 static int
 411 bnad_debugfs_release(struct inode *inode, struct file *file)
 412 {
 413         struct bnad_debug_info *debug = file->private_data;
 414
 415         if (!debug)
 416                 return 0;
 417
 418         file->private_data = NULL;
 419         kfree(debug);
 420         return 0;
 421 }
 422
 423 static int
 424 bnad_debugfs_buffer_release(struct inode *inode, struct file *file)
 425 {
 426         struct bnad_debug_info *debug = file->private_data;
 427
 428         if (!debug)
 429                 return 0;
 430
 431         kfree(debug->debug_buffer);
 432
 433         file->private_data = NULL;
 434         kfree(debug);
 435         debug = NULL;
 436         return 0;
 437 }
 438
 439 static const struct file_operations bnad_debugfs_op_fwtrc = {
 440         .owner          =       THIS_MODULE,
 441         .open           =       bnad_debugfs_open_fwtrc,
 442         .llseek         =       bnad_debugfs_lseek,
 443         .read           =       bnad_debugfs_read,
 444         .release        =       bnad_debugfs_buffer_release,
 445 };
 446
 447 static const struct file_operations bnad_debugfs_op_fwsave = {
 448         .owner          =       THIS_MODULE,
 449         .open           =       bnad_debugfs_open_fwsave,
 450         .llseek         =       bnad_debugfs_lseek,
 451         .read           =       bnad_debugfs_read,
 452         .release        =       bnad_debugfs_buffer_release,
 453 };
 454
 455 static const struct file_operations bnad_debugfs_op_regrd = {
 456         .owner          =       THIS_MODULE,
 457         .open           =       bnad_debugfs_open_reg,
 458         .llseek         =       bnad_debugfs_lseek,
 459         .read           =       bnad_debugfs_read_regrd,
 460         .write          =       bnad_debugfs_write_regrd,
 461         .release        =       bnad_debugfs_release,
 462 };
 463
 464 static const struct file_operations bnad_debugfs_op_regwr = {
 465         .owner          =       THIS_MODULE,
 466         .open           =       bnad_debugfs_open_reg,
 467         .llseek         =       bnad_debugfs_lseek,
 468         .write          =       bnad_debugfs_write_regwr,
 469         .release        =       bnad_debugfs_release,
 470 };
 471
 472 static const struct file_operations bnad_debugfs_op_drvinfo = {
 473         .owner          =       THIS_MODULE,
 474         .open           =       bnad_debugfs_open_drvinfo,
 475         .llseek         =       bnad_debugfs_lseek,
 476         .read           =       bnad_debugfs_read,
 477         .release        =       bnad_debugfs_buffer_release,
 478 };
 479
 480 struct bnad_debugfs_entry {
 481         const char *name;
 482         umode_t  mode;
 483         const struct file_operations *fops;
 484 };
 485
 486 static const struct bnad_debugfs_entry bnad_debugfs_files[] = {
 487         { "fwtrc",  S_IFREG|S_IRUGO, &bnad_debugfs_op_fwtrc, },
 488         { "fwsave", S_IFREG|S_IRUGO, &bnad_debugfs_op_fwsave, },
 489         { "regrd",  S_IFREG|S_IRUGO|S_IWUSR, &bnad_debugfs_op_regrd, },
 490         { "regwr",  S_IFREG|S_IWUSR, &bnad_debugfs_op_regwr, },
 491         { "drvinfo", S_IFREG|S_IRUGO, &bnad_debugfs_op_drvinfo, },
 492 };
 493
 494 static struct dentry *bna_debugfs_root;
 495 static atomic_t bna_debugfs_port_count;
 496
 497 /* Initialize debugfs interface for BNA */
 498 void
 499 bnad_debugfs_init(struct bnad *bnad)
 500 {
 501         const struct bnad_debugfs_entry *file;
 502         char name[64];
 503         int i;
 504
 505         /* Setup the BNA debugfs root directory*/
 506         if (!bna_debugfs_root) {
 507                 bna_debugfs_root = debugfs_create_dir("bna", NULL);
 508                 atomic_set(&bna_debugfs_port_count, 0);
 509                 if (!bna_debugfs_root) {
 510                         netdev_warn(bnad->netdev,
 511                                     "debugfs root dir creation failed\n");
 512                         return;
 513                 }
 514         }
 515
 516         /* Setup the pci_dev debugfs directory for the port */
 517         snprintf(name, sizeof(name), "pci_dev:%s", pci_name(bnad->pcidev));
 518         if (!bnad->port_debugfs_root) {
 519                 bnad->port_debugfs_root =
 520                         debugfs_create_dir(name, bna_debugfs_root);
 521                 if (!bnad->port_debugfs_root) {
 522                         netdev_warn(bnad->netdev,
 523                                     "debugfs root dir creation failed\n");
 524                         return;
 525                 }
 526
 527                 atomic_inc(&bna_debugfs_port_count);
 528
 529                 for (i = 0; i < ARRAY_SIZE(bnad_debugfs_files); i++) {
 530                         file = &bnad_debugfs_files[i];
 531                         bnad->bnad_dentry_files[i] =
 532                                         debugfs_create_file(file->name,
 533                                                         file->mode,
 534                                                         bnad->port_debugfs_root,
 535                                                         bnad,
 536                                                         file->fops);
 537                         if (!bnad->bnad_dentry_files[i]) {
 538                                 netdev_warn(bnad->netdev,
 539                                             "create %s entry failed\n",
 540                                             file->name);
 541                                 return;
 542                         }
 543                 }
 544         }
 545 }
 546
 547 /* Uninitialize debugfs interface for BNA */
 548 void
 549 bnad_debugfs_uninit(struct bnad *bnad)
 550 {
 551         int i;
 552
 553         for (i = 0; i < ARRAY_SIZE(bnad_debugfs_files); i++) {
 554                 if (bnad->bnad_dentry_files[i]) {
 555                         debugfs_remove(bnad->bnad_dentry_files[i]);
 556                         bnad->bnad_dentry_files[i] = NULL;
 557                 }
 558         }
 559
 560         /* Remove the pci_dev debugfs directory for the port */
 561         if (bnad->port_debugfs_root) {
 562                 debugfs_remove(bnad->port_debugfs_root);
 563                 bnad->port_debugfs_root = NULL;
 564                 atomic_dec(&bna_debugfs_port_count);
 565         }
 566
 567         /* Remove the BNA debugfs root directory */
 568         if (atomic_read(&bna_debugfs_port_count) == 0) {
 569                 debugfs_remove(bna_debugfs_root);
 570                 bna_debugfs_root = NULL;
 571         }
 572 }