drivers/scsi/bfa/bfad_debugfs.c

   1 /*
   2  * Copyright (c) 2005-2010 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/debugfs.h>
  19 #include <linux/export.h>
  20
  21 #include "bfad_drv.h"
  22 #include "bfad_im.h"
  23
  24 /*
  25  * BFA 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  * BFA Hierarchy:
  32  *      - bfa/pci_dev:<pci_name>
  33  * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
  34  *
  35  * Debugging service available per pci_dev:
  36  * fwtrc:  To collect current firmware trace.
  37  * drvtrc: To collect current driver trace
  38  * fwsave: To collect last saved fw trace as a result of firmware crash.
  39  * regwr:  To write one word to chip register
  40  * regrd:  To read one or more words from chip register.
  41  */
  42
  43 struct bfad_debug_info {
  44         char *debug_buffer;
  45         void *i_private;
  46         int buffer_len;
  47 };
  48
  49 static int
  50 bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file)
  51 {
  52         struct bfad_port_s *port = inode->i_private;
  53         struct bfad_s *bfad = port->bfad;
  54         struct bfad_debug_info *debug;
  55
  56         debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
  57         if (!debug)
  58                 return -ENOMEM;
  59
  60         debug->debug_buffer = (void *) bfad->trcmod;
  61         debug->buffer_len = sizeof(struct bfa_trc_mod_s);
  62
  63         file->private_data = debug;
  64
  65         return 0;
  66 }
  67
  68 static int
  69 bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
  70 {
  71         struct bfad_port_s *port = inode->i_private;
  72         struct bfad_s *bfad = port->bfad;
  73         struct bfad_debug_info *fw_debug;
  74         unsigned long flags;
  75         int rc;
  76
  77         fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
  78         if (!fw_debug)
  79                 return -ENOMEM;
  80
  81         fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
  82
  83         fw_debug->debug_buffer = vmalloc(fw_debug->buffer_len);
  84         if (!fw_debug->debug_buffer) {
  85                 kfree(fw_debug);
  86                 printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
  87                                 bfad->inst_no);
  88                 return -ENOMEM;
  89         }
  90
  91         memset(fw_debug->debug_buffer, 0, fw_debug->buffer_len);
  92
  93         spin_lock_irqsave(&bfad->bfad_lock, flags);
  94         rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc,
  95                         fw_debug->debug_buffer,
  96                         &fw_debug->buffer_len);
  97         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
  98         if (rc != BFA_STATUS_OK) {
  99                 vfree(fw_debug->debug_buffer);
 100                 fw_debug->debug_buffer = NULL;
 101                 kfree(fw_debug);
 102                 printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n",
 103                                 bfad->inst_no);
 104                 return -ENOMEM;
 105         }
 106
 107         file->private_data = fw_debug;
 108
 109         return 0;
 110 }
 111
 112 static int
 113 bfad_debugfs_open_fwsave(struct inode *inode, struct file *file)
 114 {
 115         struct bfad_port_s *port = inode->i_private;
 116         struct bfad_s *bfad = port->bfad;
 117         struct bfad_debug_info *fw_debug;
 118         unsigned long flags;
 119         int rc;
 120
 121         fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
 122         if (!fw_debug)
 123                 return -ENOMEM;
 124
 125         fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
 126
 127         fw_debug->debug_buffer = vmalloc(fw_debug->buffer_len);
 128         if (!fw_debug->debug_buffer) {
 129                 kfree(fw_debug);
 130                 printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n",
 131                                 bfad->inst_no);
 132                 return -ENOMEM;
 133         }
 134
 135         memset(fw_debug->debug_buffer, 0, fw_debug->buffer_len);
 136
 137         spin_lock_irqsave(&bfad->bfad_lock, flags);
 138         rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
 139                         fw_debug->debug_buffer,
 140                         &fw_debug->buffer_len);
 141         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 142         if (rc != BFA_STATUS_OK) {
 143                 vfree(fw_debug->debug_buffer);
 144                 fw_debug->debug_buffer = NULL;
 145                 kfree(fw_debug);
 146                 printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
 147                                 bfad->inst_no);
 148                 return -ENOMEM;
 149         }
 150
 151         file->private_data = fw_debug;
 152
 153         return 0;
 154 }
 155
 156 static int
 157 bfad_debugfs_open_reg(struct inode *inode, struct file *file)
 158 {
 159         struct bfad_debug_info *reg_debug;
 160
 161         reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
 162         if (!reg_debug)
 163                 return -ENOMEM;
 164
 165         reg_debug->i_private = inode->i_private;
 166
 167         file->private_data = reg_debug;
 168
 169         return 0;
 170 }
 171
 172 /* Changes the current file position */
 173 static loff_t
 174 bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
 175 {
 176         struct bfad_debug_info *debug;
 177         loff_t pos = file->f_pos;
 178
 179         debug = file->private_data;
 180
 181         switch (orig) {
 182         case 0:
 183                 file->f_pos = offset;
 184                 break;
 185         case 1:
 186                 file->f_pos += offset;
 187                 break;
 188         case 2:
 189                 file->f_pos = debug->buffer_len - offset;
 190                 break;
 191         default:
 192                 return -EINVAL;
 193         }
 194
 195         if (file->f_pos < 0 || file->f_pos > debug->buffer_len) {
 196                 file->f_pos = pos;
 197                 return -EINVAL;
 198         }
 199
 200         return file->f_pos;
 201 }
 202
 203 static ssize_t
 204 bfad_debugfs_read(struct file *file, char __user *buf,
 205                         size_t nbytes, loff_t *pos)
 206 {
 207         struct bfad_debug_info *debug = file->private_data;
 208
 209         if (!debug || !debug->debug_buffer)
 210                 return 0;
 211
 212         return simple_read_from_buffer(buf, nbytes, pos,
 213                                 debug->debug_buffer, debug->buffer_len);
 214 }
 215
 216 #define BFA_REG_CT_ADDRSZ       (0x40000)
 217 #define BFA_REG_CB_ADDRSZ       (0x20000)
 218 #define BFA_REG_ADDRSZ(__ioc)   \
 219         ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ?  \
 220          BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
 221 #define BFA_REG_ADDRMSK(__ioc)  (BFA_REG_ADDRSZ(__ioc) - 1)
 222
 223 static bfa_status_t
 224 bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
 225 {
 226         u8      area;
 227
 228         /* check [16:15] */
 229         area = (offset >> 15) & 0x7;
 230         if (area == 0) {
 231                 /* PCIe core register */
 232                 if ((offset + (len<<2)) > 0x8000)    /* 8k dwords or 32KB */
 233                         return BFA_STATUS_EINVAL;
 234         } else if (area == 0x1) {
 235                 /* CB 32 KB memory page */
 236                 if ((offset + (len<<2)) > 0x10000)    /* 8k dwords or 32KB */
 237                         return BFA_STATUS_EINVAL;
 238         } else {
 239                 /* CB register space 64KB */
 240                 if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
 241                         return BFA_STATUS_EINVAL;
 242         }
 243         return BFA_STATUS_OK;
 244 }
 245
 246 static ssize_t
 247 bfad_debugfs_read_regrd(struct file *file, char __user *buf,
 248                 size_t nbytes, loff_t *pos)
 249 {
 250         struct bfad_debug_info *regrd_debug = file->private_data;
 251         struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
 252         struct bfad_s *bfad = port->bfad;
 253         ssize_t rc;
 254
 255         if (!bfad->regdata)
 256                 return 0;
 257
 258         rc = simple_read_from_buffer(buf, nbytes, pos,
 259                         bfad->regdata, bfad->reglen);
 260
 261         if ((*pos + nbytes) >= bfad->reglen) {
 262                 kfree(bfad->regdata);
 263                 bfad->regdata = NULL;
 264                 bfad->reglen = 0;
 265         }
 266
 267         return rc;
 268 }
 269
 270 static ssize_t
 271 bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
 272                 size_t nbytes, loff_t *ppos)
 273 {
 274         struct bfad_debug_info *regrd_debug = file->private_data;
 275         struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
 276         struct bfad_s *bfad = port->bfad;
 277         struct bfa_s *bfa = &bfad->bfa;
 278         struct bfa_ioc_s *ioc = &bfa->ioc;
 279         int addr, len, rc, i;
 280         u32 *regbuf;
 281         void __iomem *rb, *reg_addr;
 282         unsigned long flags;
 283         void *kern_buf;
 284
 285         kern_buf = kzalloc(nbytes, GFP_KERNEL);
 286
 287         if (!kern_buf) {
 288                 printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
 289                                 bfad->inst_no);
 290                 return -ENOMEM;
 291         }
 292
 293         if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
 294                 kfree(kern_buf);
 295                 return -ENOMEM;
 296         }
 297
 298         rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 299         if (rc < 2) {
 300                 printk(KERN_INFO
 301                         "bfad[%d]: %s failed to read user buf\n",
 302                         bfad->inst_no, __func__);
 303                 kfree(kern_buf);
 304                 return -EINVAL;
 305         }
 306
 307         kfree(kern_buf);
 308         kfree(bfad->regdata);
 309         bfad->regdata = NULL;
 310         bfad->reglen = 0;
 311
 312         bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
 313         if (!bfad->regdata) {
 314                 printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
 315                                 bfad->inst_no);
 316                 return -ENOMEM;
 317         }
 318
 319         bfad->reglen = len << 2;
 320         rb = bfa_ioc_bar0(ioc);
 321         addr &= BFA_REG_ADDRMSK(ioc);
 322
 323         /* offset and len sanity check */
 324         rc = bfad_reg_offset_check(bfa, addr, len);
 325         if (rc) {
 326                 printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
 327                                 bfad->inst_no);
 328                 kfree(bfad->regdata);
 329                 bfad->regdata = NULL;
 330                 bfad->reglen = 0;
 331                 return -EINVAL;
 332         }
 333
 334         reg_addr = rb + addr;
 335         regbuf =  (u32 *)bfad->regdata;
 336         spin_lock_irqsave(&bfad->bfad_lock, flags);
 337         for (i = 0; i < len; i++) {
 338                 *regbuf = readl(reg_addr);
 339                 regbuf++;
 340                 reg_addr += sizeof(u32);
 341         }
 342         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 343
 344         return nbytes;
 345 }
 346
 347 static ssize_t
 348 bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
 349                 size_t nbytes, loff_t *ppos)
 350 {
 351         struct bfad_debug_info *debug = file->private_data;
 352         struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
 353         struct bfad_s *bfad = port->bfad;
 354         struct bfa_s *bfa = &bfad->bfa;
 355         struct bfa_ioc_s *ioc = &bfa->ioc;
 356         int addr, val, rc;
 357         void __iomem *reg_addr;
 358         unsigned long flags;
 359         void *kern_buf;
 360
 361         kern_buf = kzalloc(nbytes, GFP_KERNEL);
 362
 363         if (!kern_buf) {
 364                 printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
 365                                 bfad->inst_no);
 366                 return -ENOMEM;
 367         }
 368
 369         if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
 370                 kfree(kern_buf);
 371                 return -ENOMEM;
 372         }
 373
 374         rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 375         if (rc < 2) {
 376                 printk(KERN_INFO
 377                         "bfad[%d]: %s failed to read user buf\n",
 378                         bfad->inst_no, __func__);
 379                 kfree(kern_buf);
 380                 return -EINVAL;
 381         }
 382         kfree(kern_buf);
 383
 384         addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
 385
 386         /* offset and len sanity check */
 387         rc = bfad_reg_offset_check(bfa, addr, 1);
 388         if (rc) {
 389                 printk(KERN_INFO
 390                         "bfad[%d]: Failed reg offset check\n",
 391                         bfad->inst_no);
 392                 return -EINVAL;
 393         }
 394
 395         reg_addr = (bfa_ioc_bar0(ioc)) + addr;
 396         spin_lock_irqsave(&bfad->bfad_lock, flags);
 397         writel(val, reg_addr);
 398         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 399
 400         return nbytes;
 401 }
 402
 403 static int
 404 bfad_debugfs_release(struct inode *inode, struct file *file)
 405 {
 406         struct bfad_debug_info *debug = file->private_data;
 407
 408         if (!debug)
 409                 return 0;
 410
 411         file->private_data = NULL;
 412         kfree(debug);
 413         return 0;
 414 }
 415
 416 static int
 417 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
 418 {
 419         struct bfad_debug_info *fw_debug = file->private_data;
 420
 421         if (!fw_debug)
 422                 return 0;
 423
 424         if (fw_debug->debug_buffer)
 425                 vfree(fw_debug->debug_buffer);
 426
 427         file->private_data = NULL;
 428         kfree(fw_debug);
 429         return 0;
 430 }
 431
 432 static const struct file_operations bfad_debugfs_op_drvtrc = {
 433         .owner          =       THIS_MODULE,
 434         .open           =       bfad_debugfs_open_drvtrc,
 435         .llseek         =       bfad_debugfs_lseek,
 436         .read           =       bfad_debugfs_read,
 437         .release        =       bfad_debugfs_release,
 438 };
 439
 440 static const struct file_operations bfad_debugfs_op_fwtrc = {
 441         .owner          =       THIS_MODULE,
 442         .open           =       bfad_debugfs_open_fwtrc,
 443         .llseek         =       bfad_debugfs_lseek,
 444         .read           =       bfad_debugfs_read,
 445         .release        =       bfad_debugfs_release_fwtrc,
 446 };
 447
 448 static const struct file_operations bfad_debugfs_op_fwsave = {
 449         .owner          =       THIS_MODULE,
 450         .open           =       bfad_debugfs_open_fwsave,
 451         .llseek         =       bfad_debugfs_lseek,
 452         .read           =       bfad_debugfs_read,
 453         .release        =       bfad_debugfs_release_fwtrc,
 454 };
 455
 456 static const struct file_operations bfad_debugfs_op_regrd = {
 457         .owner          =       THIS_MODULE,
 458         .open           =       bfad_debugfs_open_reg,
 459         .llseek         =       bfad_debugfs_lseek,
 460         .read           =       bfad_debugfs_read_regrd,
 461         .write          =       bfad_debugfs_write_regrd,
 462         .release        =       bfad_debugfs_release,
 463 };
 464
 465 static const struct file_operations bfad_debugfs_op_regwr = {
 466         .owner          =       THIS_MODULE,
 467         .open           =       bfad_debugfs_open_reg,
 468         .llseek         =       bfad_debugfs_lseek,
 469         .write          =       bfad_debugfs_write_regwr,
 470         .release        =       bfad_debugfs_release,
 471 };
 472
 473 struct bfad_debugfs_entry {
 474         const char *name;
 475         umode_t mode;
 476         const struct file_operations *fops;
 477 };
 478
 479 static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
 480         { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
 481         { "fwtrc",  S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc,  },
 482         { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
 483         { "regrd",  S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd,  },
 484         { "regwr",  S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr,  },
 485 };
 486
 487 static struct dentry *bfa_debugfs_root;
 488 static atomic_t bfa_debugfs_port_count;
 489
 490 inline void
 491 bfad_debugfs_init(struct bfad_port_s *port)
 492 {
 493         struct bfad_s *bfad = port->bfad;
 494         const struct bfad_debugfs_entry *file;
 495         char name[64];
 496         int i;
 497
 498         if (!bfa_debugfs_enable)
 499                 return;
 500
 501         /* Setup the BFA debugfs root directory*/
 502         if (!bfa_debugfs_root) {
 503                 bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
 504                 atomic_set(&bfa_debugfs_port_count, 0);
 505                 if (!bfa_debugfs_root) {
 506                         printk(KERN_WARNING
 507                                 "BFA debugfs root dir creation failed\n");
 508                         goto err;
 509                 }
 510         }
 511
 512         /* Setup the pci_dev debugfs directory for the port */
 513         snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
 514         if (!port->port_debugfs_root) {
 515                 port->port_debugfs_root =
 516                         debugfs_create_dir(name, bfa_debugfs_root);
 517                 if (!port->port_debugfs_root) {
 518                         printk(KERN_WARNING
 519                                 "bfa %s: debugfs root creation failed\n",
 520                                 bfad->pci_name);
 521                         goto err;
 522                 }
 523
 524                 atomic_inc(&bfa_debugfs_port_count);
 525
 526                 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 527                         file = &bfad_debugfs_files[i];
 528                         bfad->bfad_dentry_files[i] =
 529                                         debugfs_create_file(file->name,
 530                                                         file->mode,
 531                                                         port->port_debugfs_root,
 532                                                         port,
 533                                                         file->fops);
 534                         if (!bfad->bfad_dentry_files[i]) {
 535                                 printk(KERN_WARNING
 536                                         "bfa %s: debugfs %s creation failed\n",
 537                                         bfad->pci_name, file->name);
 538                                 goto err;
 539                         }
 540                 }
 541         }
 542
 543 err:
 544         return;
 545 }
 546
 547 inline void
 548 bfad_debugfs_exit(struct bfad_port_s *port)
 549 {
 550         struct bfad_s *bfad = port->bfad;
 551         int i;
 552
 553         for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 554                 if (bfad->bfad_dentry_files[i]) {
 555                         debugfs_remove(bfad->bfad_dentry_files[i]);
 556                         bfad->bfad_dentry_files[i] = NULL;
 557                 }
 558         }
 559
 560         /* Remove the pci_dev debugfs directory for the port */
 561         if (port->port_debugfs_root) {
 562                 debugfs_remove(port->port_debugfs_root);
 563                 port->port_debugfs_root = NULL;
 564                 atomic_dec(&bfa_debugfs_port_count);
 565         }
 566
 567         /* Remove the BFA debugfs root directory */
 568         if (atomic_read(&bfa_debugfs_port_count) == 0) {
 569                 debugfs_remove(bfa_debugfs_root);
 570                 bfa_debugfs_root = NULL;
 571         }
 572 }