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Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / drivers / scsi / bfa / bfad_debugfs.c
blobb412e0300dd4756cc6549974ec9368c9c50eb794
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
20 #include "bfad_drv.h"
21 #include "bfad_im.h"
22
23 /*
24 * BFA debufs interface
25 *
26 * To access the interface, debugfs file system should be mounted
27 * if not already mounted using:
28 * mount -t debugfs none /sys/kernel/debug
29 *
30 * BFA Hierarchy:
31 * - bfa/pci_dev:<pci_name>
32 * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
33 *
34 * Debugging service available per pci_dev:
35 * fwtrc: To collect current firmware trace.
36 * drvtrc: To collect current driver 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 bfad_debug_info {
43 char *debug_buffer;
44 void *i_private;
45 int buffer_len;
46 };
47
48 static int
49 bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file)
50 {
51 struct bfad_port_s *port = inode->i_private;
52 struct bfad_s *bfad = port->bfad;
53 struct bfad_debug_info *debug;
54
55 debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
56 if (!debug)
57 return -ENOMEM;
58
59 debug->debug_buffer = (void *) bfad->trcmod;
60 debug->buffer_len = sizeof(struct bfa_trc_mod_s);
61
62 file->private_data = debug;
63
64 return 0;
65 }
66
67 static int
68 bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
69 {
70 struct bfad_port_s *port = inode->i_private;
71 struct bfad_s *bfad = port->bfad;
72 struct bfad_debug_info *fw_debug;
73 unsigned long flags;
74 int rc;
75
76 fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
77 if (!fw_debug)
78 return -ENOMEM;
79
80 fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
81
82 fw_debug->debug_buffer = vmalloc(fw_debug->buffer_len);
83 if (!fw_debug->debug_buffer) {
84 kfree(fw_debug);
85 printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
86 bfad->inst_no);
87 return -ENOMEM;
88 }
89
90 memset(fw_debug->debug_buffer, 0, fw_debug->buffer_len);
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 = vmalloc(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 memset(fw_debug->debug_buffer, 0, fw_debug->buffer_len);
135
136 spin_lock_irqsave(&bfad->bfad_lock, flags);
137 rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
138 fw_debug->debug_buffer,
139 &fw_debug->buffer_len);
140 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
141 if (rc != BFA_STATUS_OK) {
142 vfree(fw_debug->debug_buffer);
143 fw_debug->debug_buffer = NULL;
144 kfree(fw_debug);
145 printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
146 bfad->inst_no);
147 return -ENOMEM;
148 }
149
150 file->private_data = fw_debug;
151
152 return 0;
153 }
154
155 static int
156 bfad_debugfs_open_reg(struct inode *inode, struct file *file)
157 {
158 struct bfad_debug_info *reg_debug;
159
160 reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
161 if (!reg_debug)
162 return -ENOMEM;
163
164 reg_debug->i_private = inode->i_private;
165
166 file->private_data = reg_debug;
167
168 return 0;
169 }
170
171 /* Changes the current file position */
172 static loff_t
173 bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
174 {
175 struct bfad_debug_info *debug;
176 loff_t pos = file->f_pos;
177
178 debug = file->private_data;
179
180 switch (orig) {
181 case 0:
182 file->f_pos = offset;
183 break;
184 case 1:
185 file->f_pos += offset;
186 break;
187 case 2:
188 file->f_pos = debug->buffer_len - offset;
189 break;
190 default:
191 return -EINVAL;
192 }
193
194 if (file->f_pos < 0 || file->f_pos > debug->buffer_len) {
195 file->f_pos = pos;
196 return -EINVAL;
197 }
198
199 return file->f_pos;
200 }
201
202 static ssize_t
203 bfad_debugfs_read(struct file *file, char __user *buf,
204 size_t nbytes, loff_t *pos)
205 {
206 struct bfad_debug_info *debug = file->private_data;
207
208 if (!debug || !debug->debug_buffer)
209 return 0;
210
211 return simple_read_from_buffer(buf, nbytes, pos,
212 debug->debug_buffer, debug->buffer_len);
213 }
214
215 #define BFA_REG_CT_ADDRSZ (0x40000)
216 #define BFA_REG_CB_ADDRSZ (0x20000)
217 #define BFA_REG_ADDRSZ(__ioc) \
218 ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \
219 BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
220 #define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1)
221
222 static bfa_status_t
223 bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
224 {
225 u8 area;
226
227 /* check [16:15] */
228 area = (offset >> 15) & 0x7;
229 if (area == 0) {
230 /* PCIe core register */
231 if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */
232 return BFA_STATUS_EINVAL;
233 } else if (area == 0x1) {
234 /* CB 32 KB memory page */
235 if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */
236 return BFA_STATUS_EINVAL;
237 } else {
238 /* CB register space 64KB */
239 if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
240 return BFA_STATUS_EINVAL;
241 }
242 return BFA_STATUS_OK;
243 }
244
245 static ssize_t
246 bfad_debugfs_read_regrd(struct file *file, char __user *buf,
247 size_t nbytes, loff_t *pos)
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 ssize_t rc;
253
254 if (!bfad->regdata)
255 return 0;
256
257 rc = simple_read_from_buffer(buf, nbytes, pos,
258 bfad->regdata, bfad->reglen);
259
260 if ((*pos + nbytes) >= bfad->reglen) {
261 kfree(bfad->regdata);
262 bfad->regdata = NULL;
263 bfad->reglen = 0;
264 }
265
266 return rc;
267 }
268
269 static ssize_t
270 bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
271 size_t nbytes, loff_t *ppos)
272 {
273 struct bfad_debug_info *regrd_debug = file->private_data;
274 struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
275 struct bfad_s *bfad = port->bfad;
276 struct bfa_s *bfa = &bfad->bfa;
277 struct bfa_ioc_s *ioc = &bfa->ioc;
278 int addr, len, rc, i;
279 u32 *regbuf;
280 void __iomem *rb, *reg_addr;
281 unsigned long flags;
282 void *kern_buf;
283
284 kern_buf = kzalloc(nbytes, GFP_KERNEL);
285
286 if (!kern_buf) {
287 printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
288 bfad->inst_no);
289 return -ENOMEM;
290 }
291
292 if (copy_from_user(kern_buf, (void __user *)buf, nbytes)) {
293 kfree(kern_buf);
294 return -ENOMEM;
295 }
296
297 rc = sscanf(kern_buf, "%x:%x", &addr, &len);
298 if (rc < 2) {
299 printk(KERN_INFO
300 "bfad[%d]: %s failed to read user buf\n",
301 bfad->inst_no, __func__);
302 kfree(kern_buf);
303 return -EINVAL;
304 }
305
306 kfree(kern_buf);
307 kfree(bfad->regdata);
308 bfad->regdata = NULL;
309 bfad->reglen = 0;
310
311 bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
312 if (!bfad->regdata) {
313 printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
314 bfad->inst_no);
315 return -ENOMEM;
316 }
317
318 bfad->reglen = len << 2;
319 rb = bfa_ioc_bar0(ioc);
320 addr &= BFA_REG_ADDRMSK(ioc);
321
322 /* offset and len sanity check */
323 rc = bfad_reg_offset_check(bfa, addr, len);
324 if (rc) {
325 printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
326 bfad->inst_no);
327 kfree(bfad->regdata);
328 bfad->regdata = NULL;
329 bfad->reglen = 0;
330 return -EINVAL;
331 }
332
333 reg_addr = rb + addr;
334 regbuf = (u32 *)bfad->regdata;
335 spin_lock_irqsave(&bfad->bfad_lock, flags);
336 for (i = 0; i < len; i++) {
337 *regbuf = readl(reg_addr);
338 regbuf++;
339 reg_addr += sizeof(u32);
340 }
341 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
342
343 return nbytes;
344 }
345
346 static ssize_t
347 bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
348 size_t nbytes, loff_t *ppos)
349 {
350 struct bfad_debug_info *debug = file->private_data;
351 struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
352 struct bfad_s *bfad = port->bfad;
353 struct bfa_s *bfa = &bfad->bfa;
354 struct bfa_ioc_s *ioc = &bfa->ioc;
355 int addr, val, rc;
356 void __iomem *reg_addr;
357 unsigned long flags;
358 void *kern_buf;
359
360 kern_buf = kzalloc(nbytes, GFP_KERNEL);
361
362 if (!kern_buf) {
363 printk(KERN_INFO "bfad[%d]: Failed to allocate buffer\n",
364 bfad->inst_no);
365 return -ENOMEM;
366 }
367
368 if (copy_from_user(kern_buf, (void __user *)buf, nbytes)) {
369 kfree(kern_buf);
370 return -ENOMEM;
371 }
372
373 rc = sscanf(kern_buf, "%x:%x", &addr, &val);
374 if (rc < 2) {
375 printk(KERN_INFO
376 "bfad[%d]: %s failed to read user buf\n",
377 bfad->inst_no, __func__);
378 kfree(kern_buf);
379 return -EINVAL;
380 }
381 kfree(kern_buf);
382
383 addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
384
385 /* offset and len sanity check */
386 rc = bfad_reg_offset_check(bfa, addr, 1);
387 if (rc) {
388 printk(KERN_INFO
389 "bfad[%d]: Failed reg offset check\n",
390 bfad->inst_no);
391 return -EINVAL;
392 }
393
394 reg_addr = (bfa_ioc_bar0(ioc)) + addr;
395 spin_lock_irqsave(&bfad->bfad_lock, flags);
396 writel(val, reg_addr);
397 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
398
399 return nbytes;
400 }
401
402 static int
403 bfad_debugfs_release(struct inode *inode, struct file *file)
404 {
405 struct bfad_debug_info *debug = file->private_data;
406
407 if (!debug)
408 return 0;
409
410 file->private_data = NULL;
411 kfree(debug);
412 return 0;
413 }
414
415 static int
416 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
417 {
418 struct bfad_debug_info *fw_debug = file->private_data;
419
420 if (!fw_debug)
421 return 0;
422
423 if (fw_debug->debug_buffer)
424 vfree(fw_debug->debug_buffer);
425
426 file->private_data = NULL;
427 kfree(fw_debug);
428 return 0;
429 }
430
431 static const struct file_operations bfad_debugfs_op_drvtrc = {
432 .owner = THIS_MODULE,
433 .open = bfad_debugfs_open_drvtrc,
434 .llseek = bfad_debugfs_lseek,
435 .read = bfad_debugfs_read,
436 .release = bfad_debugfs_release,
437 };
438
439 static const struct file_operations bfad_debugfs_op_fwtrc = {
440 .owner = THIS_MODULE,
441 .open = bfad_debugfs_open_fwtrc,
442 .llseek = bfad_debugfs_lseek,
443 .read = bfad_debugfs_read,
444 .release = bfad_debugfs_release_fwtrc,
445 };
446
447 static const struct file_operations bfad_debugfs_op_fwsave = {
448 .owner = THIS_MODULE,
449 .open = bfad_debugfs_open_fwsave,
450 .llseek = bfad_debugfs_lseek,
451 .read = bfad_debugfs_read,
452 .release = bfad_debugfs_release_fwtrc,
453 };
454
455 static const struct file_operations bfad_debugfs_op_regrd = {
456 .owner = THIS_MODULE,
457 .open = bfad_debugfs_open_reg,
458 .llseek = bfad_debugfs_lseek,
459 .read = bfad_debugfs_read_regrd,
460 .write = bfad_debugfs_write_regrd,
461 .release = bfad_debugfs_release,
462 };
463
464 static const struct file_operations bfad_debugfs_op_regwr = {
465 .owner = THIS_MODULE,
466 .open = bfad_debugfs_open_reg,
467 .llseek = bfad_debugfs_lseek,
468 .write = bfad_debugfs_write_regwr,
469 .release = bfad_debugfs_release,
470 };
471
472 struct bfad_debugfs_entry {
473 const char *name;
474 mode_t mode;
475 const struct file_operations *fops;
476 };
477
478 static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
479 { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
480 { "fwtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc, },
481 { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
482 { "regrd", S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd, },
483 { "regwr", S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr, },
484 };
485
486 static struct dentry *bfa_debugfs_root;
487 static atomic_t bfa_debugfs_port_count;
488
489 inline void
490 bfad_debugfs_init(struct bfad_port_s *port)
491 {
492 struct bfad_s *bfad = port->bfad;
493 const struct bfad_debugfs_entry *file;
494 char name[64];
495 int i;
496
497 if (!bfa_debugfs_enable)
498 return;
499
500 /* Setup the BFA debugfs root directory*/
501 if (!bfa_debugfs_root) {
502 bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
503 atomic_set(&bfa_debugfs_port_count, 0);
504 if (!bfa_debugfs_root) {
505 printk(KERN_WARNING
506 "BFA debugfs root dir creation failed\n");
507 goto err;
508 }
509 }
510
511 /* Setup the pci_dev debugfs directory for the port */
512 snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
513 if (!port->port_debugfs_root) {
514 port->port_debugfs_root =
515 debugfs_create_dir(name, bfa_debugfs_root);
516 if (!port->port_debugfs_root) {
517 printk(KERN_WARNING
518 "bfa %s: debugfs root creation failed\n",
519 bfad->pci_name);
520 goto err;
521 }
522
523 atomic_inc(&bfa_debugfs_port_count);
524
525 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
526 file = &bfad_debugfs_files[i];
527 bfad->bfad_dentry_files[i] =
528 debugfs_create_file(file->name,
529 file->mode,
530 port->port_debugfs_root,
531 port,
532 file->fops);
533 if (!bfad->bfad_dentry_files[i]) {
534 printk(KERN_WARNING
535 "bfa %s: debugfs %s creation failed\n",
536 bfad->pci_name, file->name);
537 goto err;
538 }
539 }
540 }
541
542 err:
543 return;
544 }
545
546 inline void
547 bfad_debugfs_exit(struct bfad_port_s *port)
548 {
549 struct bfad_s *bfad = port->bfad;
550 int i;
551
552 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
553 if (bfad->bfad_dentry_files[i]) {
554 debugfs_remove(bfad->bfad_dentry_files[i]);
555 bfad->bfad_dentry_files[i] = NULL;
556 }
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 }
linux-next