1 /* 2 * Copyright (c) 2005-2014 Brocade Communications Systems, Inc. 3 * Copyright (c) 2014- QLogic Corporation. 4 * All rights reserved 5 * www.qlogic.com 6 * 7 * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License (GPL) Version 2 as 11 * published by the Free Software Foundation 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 */ 18 19 #include <linux/debugfs.h> 20 #include <linux/export.h> 21 22 #include "bfad_drv.h" 23 #include "bfad_im.h" 24 25 /* 26 * BFA debufs interface 27 * 28 * To access the interface, debugfs file system should be mounted 29 * if not already mounted using: 30 * mount -t debugfs none /sys/kernel/debug 31 * 32 * BFA Hierarchy: 33 * - bfa/pci_dev:<pci_name> 34 * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa 35 * 36 * Debugging service available per pci_dev: 37 * fwtrc: To collect current firmware trace. 38 * drvtrc: To collect current driver trace 39 * fwsave: To collect last saved fw trace as a result of firmware crash. 40 * regwr: To write one word to chip register 41 * regrd: To read one or more words from chip register. 42 */ 43 44 struct bfad_debug_info { 45 char *debug_buffer; 46 void *i_private; 47 int buffer_len; 48 }; 49 50 static int 51 bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file) 52 { 53 struct bfad_port_s *port = inode->i_private; 54 struct bfad_s *bfad = port->bfad; 55 struct bfad_debug_info *debug; 56 57 debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); 58 if (!debug) 59 return -ENOMEM; 60 61 debug->debug_buffer = (void *) bfad->trcmod; 62 debug->buffer_len = sizeof(struct bfa_trc_mod_s); 63 64 file->private_data = debug; 65 66 return 0; 67 } 68 69 static int 70 bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file) 71 { 72 struct bfad_port_s *port = inode->i_private; 73 struct bfad_s *bfad = port->bfad; 74 struct bfad_debug_info *fw_debug; 75 unsigned long flags; 76 int rc; 77 78 fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); 79 if (!fw_debug) 80 return -ENOMEM; 81 82 fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s); 83 84 fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len); 85 if (!fw_debug->debug_buffer) { 86 kfree(fw_debug); 87 printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n", 88 bfad->inst_no); 89 return -ENOMEM; 90 } 91 92 spin_lock_irqsave(&bfad->bfad_lock, flags); 93 rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc, 94 fw_debug->debug_buffer, 95 &fw_debug->buffer_len); 96 spin_unlock_irqrestore(&bfad->bfad_lock, flags); 97 if (rc != BFA_STATUS_OK) { 98 vfree(fw_debug->debug_buffer); 99 fw_debug->debug_buffer = NULL; 100 kfree(fw_debug); 101 printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n", 102 bfad->inst_no); 103 return -ENOMEM; 104 } 105 106 file->private_data = fw_debug; 107 108 return 0; 109 } 110 111 static int 112 bfad_debugfs_open_fwsave(struct inode *inode, struct file *file) 113 { 114 struct bfad_port_s *port = inode->i_private; 115 struct bfad_s *bfad = port->bfad; 116 struct bfad_debug_info *fw_debug; 117 unsigned long flags; 118 int rc; 119 120 fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); 121 if (!fw_debug) 122 return -ENOMEM; 123 124 fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s); 125 126 fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len); 127 if (!fw_debug->debug_buffer) { 128 kfree(fw_debug); 129 printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n", 130 bfad->inst_no); 131 return -ENOMEM; 132 } 133 134 spin_lock_irqsave(&bfad->bfad_lock, flags); 135 rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc, 136 fw_debug->debug_buffer, 137 &fw_debug->buffer_len); 138 spin_unlock_irqrestore(&bfad->bfad_lock, flags); 139 if (rc != BFA_STATUS_OK) { 140 vfree(fw_debug->debug_buffer); 141 fw_debug->debug_buffer = NULL; 142 kfree(fw_debug); 143 printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n", 144 bfad->inst_no); 145 return -ENOMEM; 146 } 147 148 file->private_data = fw_debug; 149 150 return 0; 151 } 152 153 static int 154 bfad_debugfs_open_reg(struct inode *inode, struct file *file) 155 { 156 struct bfad_debug_info *reg_debug; 157 158 reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL); 159 if (!reg_debug) 160 return -ENOMEM; 161 162 reg_debug->i_private = inode->i_private; 163 164 file->private_data = reg_debug; 165 166 return 0; 167 } 168 169 /* Changes the current file position */ 170 static loff_t 171 bfad_debugfs_lseek(struct file *file, loff_t offset, int orig) 172 { 173 struct bfad_debug_info *debug = file->private_data; 174 return fixed_size_llseek(file, offset, orig, 175 debug->buffer_len); 176 } 177 178 static ssize_t 179 bfad_debugfs_read(struct file *file, char __user *buf, 180 size_t nbytes, loff_t *pos) 181 { 182 struct bfad_debug_info *debug = file->private_data; 183 184 if (!debug || !debug->debug_buffer) 185 return 0; 186 187 return simple_read_from_buffer(buf, nbytes, pos, 188 debug->debug_buffer, debug->buffer_len); 189 } 190 191 #define BFA_REG_CT_ADDRSZ (0x40000) 192 #define BFA_REG_CB_ADDRSZ (0x20000) 193 #define BFA_REG_ADDRSZ(__ioc) \ 194 ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \ 195 BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ)) 196 #define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1) 197 198 static bfa_status_t 199 bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len) 200 { 201 u8 area; 202 203 /* check [16:15] */ 204 area = (offset >> 15) & 0x7; 205 if (area == 0) { 206 /* PCIe core register */ 207 if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */ 208 return BFA_STATUS_EINVAL; 209 } else if (area == 0x1) { 210 /* CB 32 KB memory page */ 211 if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */ 212 return BFA_STATUS_EINVAL; 213 } else { 214 /* CB register space 64KB */ 215 if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc)) 216 return BFA_STATUS_EINVAL; 217 } 218 return BFA_STATUS_OK; 219 } 220 221 static ssize_t 222 bfad_debugfs_read_regrd(struct file *file, char __user *buf, 223 size_t nbytes, loff_t *pos) 224 { 225 struct bfad_debug_info *regrd_debug = file->private_data; 226 struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private; 227 struct bfad_s *bfad = port->bfad; 228 ssize_t rc; 229 230 if (!bfad->regdata) 231 return 0; 232 233 rc = simple_read_from_buffer(buf, nbytes, pos, 234 bfad->regdata, bfad->reglen); 235 236 if ((*pos + nbytes) >= bfad->reglen) { 237 kfree(bfad->regdata); 238 bfad->regdata = NULL; 239 bfad->reglen = 0; 240 } 241 242 return rc; 243 } 244 245 static ssize_t 246 bfad_debugfs_write_regrd(struct file *file, const char __user *buf, 247 size_t nbytes, loff_t *ppos) 248 { 249 struct bfad_debug_info *regrd_debug = file->private_data; 250 struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private; 251 struct bfad_s *bfad = port->bfad; 252 struct bfa_s *bfa = &bfad->bfa; 253 struct bfa_ioc_s *ioc = &bfa->ioc; 254 int addr, rc, i; 255 u32 len; 256 u32 *regbuf; 257 void __iomem *rb, *reg_addr; 258 unsigned long flags; 259 void *kern_buf; 260 261 kern_buf = memdup_user(buf, nbytes); 262 if (IS_ERR(kern_buf)) 263 return PTR_ERR(kern_buf); 264 265 rc = sscanf(kern_buf, "%x:%x", &addr, &len); 266 if (rc < 2 || len > (UINT_MAX >> 2)) { 267 printk(KERN_INFO 268 "bfad[%d]: %s failed to read user buf\n", 269 bfad->inst_no, __func__); 270 kfree(kern_buf); 271 return -EINVAL; 272 } 273 274 kfree(kern_buf); 275 kfree(bfad->regdata); 276 bfad->regdata = NULL; 277 bfad->reglen = 0; 278 279 bfad->regdata = kzalloc(len << 2, GFP_KERNEL); 280 if (!bfad->regdata) { 281 printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n", 282 bfad->inst_no); 283 return -ENOMEM; 284 } 285 286 bfad->reglen = len << 2; 287 rb = bfa_ioc_bar0(ioc); 288 addr &= BFA_REG_ADDRMSK(ioc); 289 290 /* offset and len sanity check */ 291 rc = bfad_reg_offset_check(bfa, addr, len); 292 if (rc) { 293 printk(KERN_INFO "bfad[%d]: Failed reg offset check\n", 294 bfad->inst_no); 295 kfree(bfad->regdata); 296 bfad->regdata = NULL; 297 bfad->reglen = 0; 298 return -EINVAL; 299 } 300 301 reg_addr = rb + addr; 302 regbuf = (u32 *)bfad->regdata; 303 spin_lock_irqsave(&bfad->bfad_lock, flags); 304 for (i = 0; i < len; i++) { 305 *regbuf = readl(reg_addr); 306 regbuf++; 307 reg_addr += sizeof(u32); 308 } 309 spin_unlock_irqrestore(&bfad->bfad_lock, flags); 310 311 return nbytes; 312 } 313 314 static ssize_t 315 bfad_debugfs_write_regwr(struct file *file, const char __user *buf, 316 size_t nbytes, loff_t *ppos) 317 { 318 struct bfad_debug_info *debug = file->private_data; 319 struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private; 320 struct bfad_s *bfad = port->bfad; 321 struct bfa_s *bfa = &bfad->bfa; 322 struct bfa_ioc_s *ioc = &bfa->ioc; 323 int addr, val, rc; 324 void __iomem *reg_addr; 325 unsigned long flags; 326 void *kern_buf; 327 328 kern_buf = memdup_user(buf, nbytes); 329 if (IS_ERR(kern_buf)) 330 return PTR_ERR(kern_buf); 331 332 rc = sscanf(kern_buf, "%x:%x", &addr, &val); 333 if (rc < 2) { 334 printk(KERN_INFO 335 "bfad[%d]: %s failed to read user buf\n", 336 bfad->inst_no, __func__); 337 kfree(kern_buf); 338 return -EINVAL; 339 } 340 kfree(kern_buf); 341 342 addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */ 343 344 /* offset and len sanity check */ 345 rc = bfad_reg_offset_check(bfa, addr, 1); 346 if (rc) { 347 printk(KERN_INFO 348 "bfad[%d]: Failed reg offset check\n", 349 bfad->inst_no); 350 return -EINVAL; 351 } 352 353 reg_addr = (bfa_ioc_bar0(ioc)) + addr; 354 spin_lock_irqsave(&bfad->bfad_lock, flags); 355 writel(val, reg_addr); 356 spin_unlock_irqrestore(&bfad->bfad_lock, flags); 357 358 return nbytes; 359 } 360 361 static int 362 bfad_debugfs_release(struct inode *inode, struct file *file) 363 { 364 struct bfad_debug_info *debug = file->private_data; 365 366 if (!debug) 367 return 0; 368 369 file->private_data = NULL; 370 kfree(debug); 371 return 0; 372 } 373 374 static int 375 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file) 376 { 377 struct bfad_debug_info *fw_debug = file->private_data; 378 379 if (!fw_debug) 380 return 0; 381 382 if (fw_debug->debug_buffer) 383 vfree(fw_debug->debug_buffer); 384 385 file->private_data = NULL; 386 kfree(fw_debug); 387 return 0; 388 } 389 390 static const struct file_operations bfad_debugfs_op_drvtrc = { 391 .owner = THIS_MODULE, 392 .open = bfad_debugfs_open_drvtrc, 393 .llseek = bfad_debugfs_lseek, 394 .read = bfad_debugfs_read, 395 .release = bfad_debugfs_release, 396 }; 397 398 static const struct file_operations bfad_debugfs_op_fwtrc = { 399 .owner = THIS_MODULE, 400 .open = bfad_debugfs_open_fwtrc, 401 .llseek = bfad_debugfs_lseek, 402 .read = bfad_debugfs_read, 403 .release = bfad_debugfs_release_fwtrc, 404 }; 405 406 static const struct file_operations bfad_debugfs_op_fwsave = { 407 .owner = THIS_MODULE, 408 .open = bfad_debugfs_open_fwsave, 409 .llseek = bfad_debugfs_lseek, 410 .read = bfad_debugfs_read, 411 .release = bfad_debugfs_release_fwtrc, 412 }; 413 414 static const struct file_operations bfad_debugfs_op_regrd = { 415 .owner = THIS_MODULE, 416 .open = bfad_debugfs_open_reg, 417 .llseek = bfad_debugfs_lseek, 418 .read = bfad_debugfs_read_regrd, 419 .write = bfad_debugfs_write_regrd, 420 .release = bfad_debugfs_release, 421 }; 422 423 static const struct file_operations bfad_debugfs_op_regwr = { 424 .owner = THIS_MODULE, 425 .open = bfad_debugfs_open_reg, 426 .llseek = bfad_debugfs_lseek, 427 .write = bfad_debugfs_write_regwr, 428 .release = bfad_debugfs_release, 429 }; 430 431 struct bfad_debugfs_entry { 432 const char *name; 433 umode_t mode; 434 const struct file_operations *fops; 435 }; 436 437 static const struct bfad_debugfs_entry bfad_debugfs_files[] = { 438 { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, }, 439 { "fwtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc, }, 440 { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, }, 441 { "regrd", S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd, }, 442 { "regwr", S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr, }, 443 }; 444 445 static struct dentry *bfa_debugfs_root; 446 static atomic_t bfa_debugfs_port_count; 447 448 inline void 449 bfad_debugfs_init(struct bfad_port_s *port) 450 { 451 struct bfad_s *bfad = port->bfad; 452 const struct bfad_debugfs_entry *file; 453 char name[64]; 454 int i; 455 456 if (!bfa_debugfs_enable) 457 return; 458 459 /* Setup the BFA debugfs root directory*/ 460 if (!bfa_debugfs_root) { 461 bfa_debugfs_root = debugfs_create_dir("bfa", NULL); 462 atomic_set(&bfa_debugfs_port_count, 0); 463 } 464 465 /* Setup the pci_dev debugfs directory for the port */ 466 snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name); 467 if (!port->port_debugfs_root) { 468 port->port_debugfs_root = 469 debugfs_create_dir(name, bfa_debugfs_root); 470 471 atomic_inc(&bfa_debugfs_port_count); 472 473 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) { 474 file = &bfad_debugfs_files[i]; 475 bfad->bfad_dentry_files[i] = 476 debugfs_create_file(file->name, 477 file->mode, 478 port->port_debugfs_root, 479 port, 480 file->fops); 481 } 482 } 483 484 return; 485 } 486 487 inline void 488 bfad_debugfs_exit(struct bfad_port_s *port) 489 { 490 struct bfad_s *bfad = port->bfad; 491 int i; 492 493 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) { 494 if (bfad->bfad_dentry_files[i]) { 495 debugfs_remove(bfad->bfad_dentry_files[i]); 496 bfad->bfad_dentry_files[i] = NULL; 497 } 498 } 499 500 /* Remove the pci_dev debugfs directory for the port */ 501 if (port->port_debugfs_root) { 502 debugfs_remove(port->port_debugfs_root); 503 port->port_debugfs_root = NULL; 504 atomic_dec(&bfa_debugfs_port_count); 505 } 506 507 /* Remove the BFA debugfs root directory */ 508 if (atomic_read(&bfa_debugfs_port_count) == 0) { 509 debugfs_remove(bfa_debugfs_root); 510 bfa_debugfs_root = NULL; 511 } 512 } 513