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USB: ftdi_sio: Add more identifiers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / bfa / bfad_debugfs.c
blobdee1a094c2c2a6af5a80871785afea81a60e5833
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 mode_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 /*
561 * Remove the pci_dev debugfs directory for the port */
562 if (port->port_debugfs_root) {
563 debugfs_remove(port->port_debugfs_root);
564 port->port_debugfs_root = NULL;
565 atomic_dec(&bfa_debugfs_port_count);
566 }
567
568 /* Remove the BFA debugfs root directory */
569 if (atomic_read(&bfa_debugfs_port_count) == 0) {
570 debugfs_remove(bfa_debugfs_root);
571 bfa_debugfs_root = NULL;
572 }
573 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree