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 = kzalloc(nbytes, GFP_KERNEL);
 264
 265         if (!kern_buf) {
 266                 printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
 267                                 bfad->inst_no);
 268                 return -ENOMEM;
 269         }
 270
 271         if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
 272                 kfree(kern_buf);
 273                 return -ENOMEM;
 274         }
 275
 276         rc = sscanf(kern_buf, "%x:%x", &addr, &len);
 277         if (rc < 2) {
 278                 printk(KERN_INFO
 279                         "bfad[%d]: %s failed to read user buf\n",
 280                         bfad->inst_no, __func__);
 281                 kfree(kern_buf);
 282                 return -EINVAL;
 283         }
 284
 285         kfree(kern_buf);
 286         kfree(bfad->regdata);
 287         bfad->regdata = NULL;
 288         bfad->reglen = 0;
 289
 290         bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
 291         if (!bfad->regdata) {
 292                 printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
 293                                 bfad->inst_no);
 294                 return -ENOMEM;
 295         }
 296
 297         bfad->reglen = len << 2;
 298         rb = bfa_ioc_bar0(ioc);
 299         addr &= BFA_REG_ADDRMSK(ioc);
 300
 301         /* offset and len sanity check */
 302         rc = bfad_reg_offset_check(bfa, addr, len);
 303         if (rc) {
 304                 printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
 305                                 bfad->inst_no);
 306                 kfree(bfad->regdata);
 307                 bfad->regdata = NULL;
 308                 bfad->reglen = 0;
 309                 return -EINVAL;
 310         }
 311
 312         reg_addr = rb + addr;
 313         regbuf =  (u32 *)bfad->regdata;
 314         spin_lock_irqsave(&bfad->bfad_lock, flags);
 315         for (i = 0; i < len; i++) {
 316                 *regbuf = readl(reg_addr);
 317                 regbuf++;
 318                 reg_addr += sizeof(u32);
 319         }
 320         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 321
 322         return nbytes;
 323 }
 324
 325 static ssize_t
 326 bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
 327                 size_t nbytes, loff_t *ppos)
 328 {
 329         struct bfad_debug_info *debug = file->private_data;
 330         struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
 331         struct bfad_s *bfad = port->bfad;
 332         struct bfa_s *bfa = &bfad->bfa;
 333         struct bfa_ioc_s *ioc = &bfa->ioc;
 334         int addr, val, rc;
 335         void __iomem *reg_addr;
 336         unsigned long flags;
 337         void *kern_buf;
 338
 339         kern_buf = kzalloc(nbytes, GFP_KERNEL);
 340
 341         if (!kern_buf) {
 342                 printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
 343                                 bfad->inst_no);
 344                 return -ENOMEM;
 345         }
 346
 347         if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
 348                 kfree(kern_buf);
 349                 return -ENOMEM;
 350         }
 351
 352         rc = sscanf(kern_buf, "%x:%x", &addr, &val);
 353         if (rc < 2) {
 354                 printk(KERN_INFO
 355                         "bfad[%d]: %s failed to read user buf\n",
 356                         bfad->inst_no, __func__);
 357                 kfree(kern_buf);
 358                 return -EINVAL;
 359         }
 360         kfree(kern_buf);
 361
 362         addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
 363
 364         /* offset and len sanity check */
 365         rc = bfad_reg_offset_check(bfa, addr, 1);
 366         if (rc) {
 367                 printk(KERN_INFO
 368                         "bfad[%d]: Failed reg offset check\n",
 369                         bfad->inst_no);
 370                 return -EINVAL;
 371         }
 372
 373         reg_addr = (bfa_ioc_bar0(ioc)) + addr;
 374         spin_lock_irqsave(&bfad->bfad_lock, flags);
 375         writel(val, reg_addr);
 376         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 377
 378         return nbytes;
 379 }
 380
 381 static int
 382 bfad_debugfs_release(struct inode *inode, struct file *file)
 383 {
 384         struct bfad_debug_info *debug = file->private_data;
 385
 386         if (!debug)
 387                 return 0;
 388
 389         file->private_data = NULL;
 390         kfree(debug);
 391         return 0;
 392 }
 393
 394 static int
 395 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
 396 {
 397         struct bfad_debug_info *fw_debug = file->private_data;
 398
 399         if (!fw_debug)
 400                 return 0;
 401
 402         if (fw_debug->debug_buffer)
 403                 vfree(fw_debug->debug_buffer);
 404
 405         file->private_data = NULL;
 406         kfree(fw_debug);
 407         return 0;
 408 }
 409
 410 static const struct file_operations bfad_debugfs_op_drvtrc = {
 411         .owner          =       THIS_MODULE,
 412         .open           =       bfad_debugfs_open_drvtrc,
 413         .llseek         =       bfad_debugfs_lseek,
 414         .read           =       bfad_debugfs_read,
 415         .release        =       bfad_debugfs_release,
 416 };
 417
 418 static const struct file_operations bfad_debugfs_op_fwtrc = {
 419         .owner          =       THIS_MODULE,
 420         .open           =       bfad_debugfs_open_fwtrc,
 421         .llseek         =       bfad_debugfs_lseek,
 422         .read           =       bfad_debugfs_read,
 423         .release        =       bfad_debugfs_release_fwtrc,
 424 };
 425
 426 static const struct file_operations bfad_debugfs_op_fwsave = {
 427         .owner          =       THIS_MODULE,
 428         .open           =       bfad_debugfs_open_fwsave,
 429         .llseek         =       bfad_debugfs_lseek,
 430         .read           =       bfad_debugfs_read,
 431         .release        =       bfad_debugfs_release_fwtrc,
 432 };
 433
 434 static const struct file_operations bfad_debugfs_op_regrd = {
 435         .owner          =       THIS_MODULE,
 436         .open           =       bfad_debugfs_open_reg,
 437         .llseek         =       bfad_debugfs_lseek,
 438         .read           =       bfad_debugfs_read_regrd,
 439         .write          =       bfad_debugfs_write_regrd,
 440         .release        =       bfad_debugfs_release,
 441 };
 442
 443 static const struct file_operations bfad_debugfs_op_regwr = {
 444         .owner          =       THIS_MODULE,
 445         .open           =       bfad_debugfs_open_reg,
 446         .llseek         =       bfad_debugfs_lseek,
 447         .write          =       bfad_debugfs_write_regwr,
 448         .release        =       bfad_debugfs_release,
 449 };
 450
 451 struct bfad_debugfs_entry {
 452         const char *name;
 453         umode_t mode;
 454         const struct file_operations *fops;
 455 };
 456
 457 static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
 458         { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
 459         { "fwtrc",  S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc,  },
 460         { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
 461         { "regrd",  S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd,  },
 462         { "regwr",  S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr,  },
 463 };
 464
 465 static struct dentry *bfa_debugfs_root;
 466 static atomic_t bfa_debugfs_port_count;
 467
 468 inline void
 469 bfad_debugfs_init(struct bfad_port_s *port)
 470 {
 471         struct bfad_s *bfad = port->bfad;
 472         const struct bfad_debugfs_entry *file;
 473         char name[64];
 474         int i;
 475
 476         if (!bfa_debugfs_enable)
 477                 return;
 478
 479         /* Setup the BFA debugfs root directory*/
 480         if (!bfa_debugfs_root) {
 481                 bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
 482                 atomic_set(&bfa_debugfs_port_count, 0);
 483                 if (!bfa_debugfs_root) {
 484                         printk(KERN_WARNING
 485                                 "BFA debugfs root dir creation failed\n");
 486                         goto err;
 487                 }
 488         }
 489
 490         /* Setup the pci_dev debugfs directory for the port */
 491         snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
 492         if (!port->port_debugfs_root) {
 493                 port->port_debugfs_root =
 494                         debugfs_create_dir(name, bfa_debugfs_root);
 495                 if (!port->port_debugfs_root) {
 496                         printk(KERN_WARNING
 497                                 "bfa %s: debugfs root creation failed\n",
 498                                 bfad->pci_name);
 499                         goto err;
 500                 }
 501
 502                 atomic_inc(&bfa_debugfs_port_count);
 503
 504                 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 505                         file = &bfad_debugfs_files[i];
 506                         bfad->bfad_dentry_files[i] =
 507                                         debugfs_create_file(file->name,
 508                                                         file->mode,
 509                                                         port->port_debugfs_root,
 510                                                         port,
 511                                                         file->fops);
 512                         if (!bfad->bfad_dentry_files[i]) {
 513                                 printk(KERN_WARNING
 514                                         "bfa %s: debugfs %s creation failed\n",
 515                                         bfad->pci_name, file->name);
 516                                 goto err;
 517                         }
 518                 }
 519         }
 520
 521 err:
 522         return;
 523 }
 524
 525 inline void
 526 bfad_debugfs_exit(struct bfad_port_s *port)
 527 {
 528         struct bfad_s *bfad = port->bfad;
 529         int i;
 530
 531         for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
 532                 if (bfad->bfad_dentry_files[i]) {
 533                         debugfs_remove(bfad->bfad_dentry_files[i]);
 534                         bfad->bfad_dentry_files[i] = NULL;
 535                 }
 536         }
 537
 538         /* Remove the pci_dev debugfs directory for the port */
 539         if (port->port_debugfs_root) {
 540                 debugfs_remove(port->port_debugfs_root);
 541                 port->port_debugfs_root = NULL;
 542                 atomic_dec(&bfa_debugfs_port_count);
 543         }
 544
 545         /* Remove the BFA debugfs root directory */
 546         if (atomic_read(&bfa_debugfs_port_count) == 0) {
 547                 debugfs_remove(bfa_debugfs_root);
 548                 bfa_debugfs_root = NULL;
 549         }
 550 }