kernel/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 = file->private_data;
 177         return fixed_size_llseek(file, offset, orig,
 178                                 debug->buffer_len);
 179 }
 180
 181 static ssize_t
 182 bfad_debugfs_read(struct file *file, char __user *buf,
 183                         size_t nbytes, loff_t *pos)
 184 {
 185         struct bfad_debug_info *debug = file->private_data;
 186
 187         if (!debug || !debug->debug_buffer)
 188                 return 0;
 189
 190         return simple_read_from_buffer(buf, nbytes, pos,
 191                                 debug->debug_buffer, debug->buffer_len);
 192 }
 193
 194 #define BFA_REG_CT_ADDRSZ       (0x40000)
 195 #define BFA_REG_CB_ADDRSZ       (0x20000)
 196 #define BFA_REG_ADDRSZ(__ioc)   \
 197         ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ?  \
 198          BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
 199 #define BFA_REG_ADDRMSK(__ioc)  (BFA_REG_ADDRSZ(__ioc) - 1)
 200
 201 static bfa_status_t
 202 bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
 203 {
 204         u8      area;
 205
 206         /* check [16:15] */
 207         area = (offset >> 15) & 0x7;
 208         if (area == 0) {
 209                 /* PCIe core register */
 210                 if ((offset + (len<<2)) > 0x8000)    /* 8k dwords or 32KB */
 211                         return BFA_STATUS_EINVAL;
 212         } else if (area == 0x1) {
 213                 /* CB 32 KB memory page */
 214                 if ((offset + (len<<2)) > 0x10000)    /* 8k dwords or 32KB */
 215                         return BFA_STATUS_EINVAL;
 216         } else {
 217                 /* CB register space 64KB */
 218                 if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
 219                         return BFA_STATUS_EINVAL;
 220         }
 221         return BFA_STATUS_OK;
 222 }
 223
 224 static ssize_t
 225 bfad_debugfs_read_regrd(struct file *file, char __user *buf,
 226                 size_t nbytes, loff_t *pos)
 227 {
 228         struct bfad_debug_info *regrd_debug = file->private_data;
 229         struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
 230         struct bfad_s *bfad = port->bfad;
 231         ssize_t rc;
 232
 233         if (!bfad->regdata)
 234                 return 0;
 235
 236         rc = simple_read_from_buffer(buf, nbytes, pos,
 237                         bfad->regdata, bfad->reglen);
 238
 239         if ((*pos + nbytes) >= bfad->reglen) {
 240                 kfree(bfad->regdata);
 241                 bfad->regdata = NULL;
 242                 bfad->reglen = 0;
 243         }
 244
 245         return rc;
 246 }
 247
 248 static ssize_t
 249 bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
 250                 size_t nbytes, loff_t *ppos)
 251 {
 252         struct bfad_debug_info *regrd_debug = file->private_data;
 253         struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
 254         struct bfad_s *bfad = port->bfad;
 255         struct bfa_s *bfa = &bfad->bfa;
 256         struct bfa_ioc_s *ioc = &bfa->ioc;
 257         int addr, len, rc, i;
 258         u32 *regbuf;
 259         void __iomem *rb, *reg_addr;
 260         unsigned long flags;
 261         void *kern_buf;
 262
 263         kern_buf = memdup_user(buf, nbytes);
 264         if (IS_ERR(kern_buf))
 265                 return PTR_ERR(kern_buf);
 266
 267         rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 268         if (rc < 2) {
 269                 printk(KERN_INFO
 270                         "bfad[%d]: %s failed to read user buf\n",
 271                         bfad->inst_no, __func__);
 272                 kfree(kern_buf);
 273                 return -EINVAL;
 274         }
 275
 276         kfree(kern_buf);
 277         kfree(bfad->regdata);
 278         bfad->regdata = NULL;
 279         bfad->reglen = 0;
 280
 281         bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
 282         if (!bfad->regdata) {
 283                 printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
 284                                 bfad->inst_no);
 285                 return -ENOMEM;
 286         }
 287
 288         bfad->reglen = len << 2;
 289         rb = bfa_ioc_bar0(ioc);
 290         addr &= BFA_REG_ADDRMSK(ioc);
 291
 292         /* offset and len sanity check */
 293         rc = bfad_reg_offset_check(bfa, addr, len);
 294         if (rc) {
 295                 printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
 296                                 bfad->inst_no);
 297                 kfree(bfad->regdata);
 298                 bfad->regdata = NULL;
 299                 bfad->reglen = 0;
 300                 return -EINVAL;
 301         }
 302
 303         reg_addr = rb + addr;
 304         regbuf =  (u32 *)bfad->regdata;
 305         spin_lock_irqsave(&bfad->bfad_lock, flags);
 306         for (i = 0; i < len; i++) {
 307                 *regbuf = readl(reg_addr);
 308                 regbuf++;
 309                 reg_addr += sizeof(u32);
 310         }
 311         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 312
 313         return nbytes;
 314 }
 315
 316 static ssize_t
 317 bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
 318                 size_t nbytes, loff_t *ppos)
 319 {
 320         struct bfad_debug_info *debug = file->private_data;
 321         struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
 322         struct bfad_s *bfad = port->bfad;
 323         struct bfa_s *bfa = &bfad->bfa;
 324         struct bfa_ioc_s *ioc = &bfa->ioc;
 325         int addr, val, rc;
 326         void __iomem *reg_addr;
 327         unsigned long flags;
 328         void *kern_buf;
 329
 330         kern_buf = memdup_user(buf, nbytes);
 331         if (IS_ERR(kern_buf))
 332                 return PTR_ERR(kern_buf);
 333
 334         rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 335         if (rc < 2) {
 336                 printk(KERN_INFO
 337                         "bfad[%d]: %s failed to read user buf\n",
 338                         bfad->inst_no, __func__);
 339                 kfree(kern_buf);
 340                 return -EINVAL;
 341         }
 342         kfree(kern_buf);
 343
 344         addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
 345
 346         /* offset and len sanity check */
 347         rc = bfad_reg_offset_check(bfa, addr, 1);
 348         if (rc) {
 349                 printk(KERN_INFO
 350                         "bfad[%d]: Failed reg offset check\n",
 351                         bfad->inst_no);
 352                 return -EINVAL;
 353         }
 354
 355         reg_addr = (bfa_ioc_bar0(ioc)) + addr;
 356         spin_lock_irqsave(&bfad->bfad_lock, flags);
 357         writel(val, reg_addr);
 358         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 359
 360         return nbytes;
 361 }
 362
 363 static int
 364 bfad_debugfs_release(struct inode *inode, struct file *file)
 365 {
 366         struct bfad_debug_info *debug = file->private_data;
 367
 368         if (!debug)
 369                 return 0;
 370
 371         file->private_data = NULL;
 372         kfree(debug);
 373         return 0;
 374 }
 375
 376 static int
 377 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
 378 {
 379         struct bfad_debug_info *fw_debug = file->private_data;
 380
 381         if (!fw_debug)
 382                 return 0;
 383
 384         if (fw_debug->debug_buffer)
 385                 vfree(fw_debug->debug_buffer);
 386
 387         file->private_data = NULL;
 388         kfree(fw_debug);
 389         return 0;
 390 }
 391
 392 static const struct file_operations bfad_debugfs_op_drvtrc = {
 393         .owner          =       THIS_MODULE,
 394         .open           =       bfad_debugfs_open_drvtrc,
 395         .llseek         =       bfad_debugfs_lseek,
 396         .read           =       bfad_debugfs_read,
 397         .release        =       bfad_debugfs_release,
 398 };
 399
 400 static const struct file_operations bfad_debugfs_op_fwtrc = {
 401         .owner          =       THIS_MODULE,
 402         .open           =       bfad_debugfs_open_fwtrc,
 403         .llseek         =       bfad_debugfs_lseek,
 404         .read           =       bfad_debugfs_read,
 405         .release        =       bfad_debugfs_release_fwtrc,
 406 };
 407
 408 static const struct file_operations bfad_debugfs_op_fwsave = {
 409         .owner          =       THIS_MODULE,
 410         .open           =       bfad_debugfs_open_fwsave,
 411         .llseek         =       bfad_debugfs_lseek,
 412         .read           =       bfad_debugfs_read,
 413         .release        =       bfad_debugfs_release_fwtrc,
 414 };
 415
 416 static const struct file_operations bfad_debugfs_op_regrd = {
 417         .owner          =       THIS_MODULE,
 418         .open           =       bfad_debugfs_open_reg,
 419         .llseek         =       bfad_debugfs_lseek,
 420         .read           =       bfad_debugfs_read_regrd,
 421         .write          =       bfad_debugfs_write_regrd,
 422         .release        =       bfad_debugfs_release,
 423 };
 424
 425 static const struct file_operations bfad_debugfs_op_regwr = {
 426         .owner          =       THIS_MODULE,
 427         .open           =       bfad_debugfs_open_reg,
 428         .llseek         =       bfad_debugfs_lseek,
 429         .write          =       bfad_debugfs_write_regwr,
 430         .release        =       bfad_debugfs_release,
 431 };
 432
 433 struct bfad_debugfs_entry {
 434         const char *name;
 435         umode_t mode;
 436         const struct file_operations *fops;
 437 };
 438
 439 static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
 440         { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
 441         { "fwtrc",  S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc,  },
 442         { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
 443         { "regrd",  S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd,  },
 444         { "regwr",  S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr,  },
 445 };
 446
 447 static struct dentry *bfa_debugfs_root;
 448 static atomic_t bfa_debugfs_port_count;
 449
 450 inline void
 451 bfad_debugfs_init(struct bfad_port_s *port)
 452 {
 453         struct bfad_s *bfad = port->bfad;
 454         const struct bfad_debugfs_entry *file;
 455         char name[64];
 456         int i;
 457
 458         if (!bfa_debugfs_enable)
 459                 return;
 460
 461         /* Setup the BFA debugfs root directory*/
 462         if (!bfa_debugfs_root) {
 463                 bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
 464                 atomic_set(&bfa_debugfs_port_count, 0);
 465                 if (!bfa_debugfs_root) {
 466                         printk(KERN_WARNING
 467                                 "BFA debugfs root dir creation failed\n");
 468                         goto err;
 469                 }
 470         }
 471
 472         /* Setup the pci_dev debugfs directory for the port */
 473         snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
 474         if (!port->port_debugfs_root) {
 475                 port->port_debugfs_root =
 476                         debugfs_create_dir(name, bfa_debugfs_root);
 477                 if (!port->port_debugfs_root) {
 478                         printk(KERN_WARNING
 479                                 "bfa %s: debugfs root creation failed\n",
 480                                 bfad->pci_name);
 481                         goto err;
 482                 }
 483
 484                 atomic_inc(&bfa_debugfs_port_count);
 485
 486                 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 487                         file = &bfad_debugfs_files[i];
 488                         bfad->bfad_dentry_files[i] =
 489                                         debugfs_create_file(file->name,
 490                                                         file->mode,
 491                                                         port->port_debugfs_root,
 492                                                         port,
 493                                                         file->fops);
 494                         if (!bfad->bfad_dentry_files[i]) {
 495                                 printk(KERN_WARNING
 496                                         "bfa %s: debugfs %s creation failed\n",
 497                                         bfad->pci_name, file->name);
 498                                 goto err;
 499                         }
 500                 }
 501         }
 502
 503 err:
 504         return;
 505 }
 506
 507 inline void
 508 bfad_debugfs_exit(struct bfad_port_s *port)
 509 {
 510         struct bfad_s *bfad = port->bfad;
 511         int i;
 512
 513         for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 514                 if (bfad->bfad_dentry_files[i]) {
 515                         debugfs_remove(bfad->bfad_dentry_files[i]);
 516                         bfad->bfad_dentry_files[i] = NULL;
 517                 }
 518         }
 519
 520         /* Remove the pci_dev debugfs directory for the port */
 521         if (port->port_debugfs_root) {
 522                 debugfs_remove(port->port_debugfs_root);
 523                 port->port_debugfs_root = NULL;
 524                 atomic_dec(&bfa_debugfs_port_count);
 525         }
 526
 527         /* Remove the BFA debugfs root directory */
 528         if (atomic_read(&bfa_debugfs_port_count) == 0) {
 529                 debugfs_remove(bfa_debugfs_root);
 530                 bfa_debugfs_root = NULL;
 531         }
 532 }