1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
4 * Copyright (c) 2014- QLogic Corporation.
5 * All rights reserved
6 * www.qlogic.com
7 *
8 * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
9 */
10
11 #include <linux/debugfs.h>
12 #include <linux/export.h>
13
14 #include "bfad_drv.h"
15 #include "bfad_im.h"
16
17 /*
18 * BFA debufs interface
19 *
20 * To access the interface, debugfs file system should be mounted
21 * if not already mounted using:
22 * mount -t debugfs none /sys/kernel/debug
23 *
24 * BFA Hierarchy:
25 * - bfa/pci_dev:<pci_name>
26 * where the pci_name corresponds to the one under /sys/bus/pci/drivers/bfa
27 *
28 * Debugging service available per pci_dev:
29 * fwtrc: To collect current firmware trace.
30 * drvtrc: To collect current driver trace
31 * fwsave: To collect last saved fw trace as a result of firmware crash.
32 * regwr: To write one word to chip register
33 * regrd: To read one or more words from chip register.
34 */
35
36 struct bfad_debug_info {
37 char *debug_buffer;
38 void *i_private;
39 int buffer_len;
40 };
41
42 static int
bfad_debugfs_open_drvtrc(struct inode * inode,struct file * file)43 bfad_debugfs_open_drvtrc(struct inode *inode, struct file *file)
44 {
45 struct bfad_port_s *port = inode->i_private;
46 struct bfad_s *bfad = port->bfad;
47 struct bfad_debug_info *debug;
48
49 debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
50 if (!debug)
51 return -ENOMEM;
52
53 debug->debug_buffer = (void *) bfad->trcmod;
54 debug->buffer_len = sizeof(struct bfa_trc_mod_s);
55
56 file->private_data = debug;
57
58 return 0;
59 }
60
61 static int
bfad_debugfs_open_fwtrc(struct inode * inode,struct file * file)62 bfad_debugfs_open_fwtrc(struct inode *inode, struct file *file)
63 {
64 struct bfad_port_s *port = inode->i_private;
65 struct bfad_s *bfad = port->bfad;
66 struct bfad_debug_info *fw_debug;
67 unsigned long flags;
68 int rc;
69
70 fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
71 if (!fw_debug)
72 return -ENOMEM;
73
74 fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
75
76 fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
77 if (!fw_debug->debug_buffer) {
78 kfree(fw_debug);
79 printk(KERN_INFO "bfad[%d]: Failed to allocate fwtrc buffer\n",
80 bfad->inst_no);
81 return -ENOMEM;
82 }
83
84 spin_lock_irqsave(&bfad->bfad_lock, flags);
85 rc = bfa_ioc_debug_fwtrc(&bfad->bfa.ioc,
86 fw_debug->debug_buffer,
87 &fw_debug->buffer_len);
88 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
89 if (rc != BFA_STATUS_OK) {
90 vfree(fw_debug->debug_buffer);
91 fw_debug->debug_buffer = NULL;
92 kfree(fw_debug);
93 printk(KERN_INFO "bfad[%d]: Failed to collect fwtrc\n",
94 bfad->inst_no);
95 return -ENOMEM;
96 }
97
98 file->private_data = fw_debug;
99
100 return 0;
101 }
102
103 static int
bfad_debugfs_open_fwsave(struct inode * inode,struct file * file)104 bfad_debugfs_open_fwsave(struct inode *inode, struct file *file)
105 {
106 struct bfad_port_s *port = inode->i_private;
107 struct bfad_s *bfad = port->bfad;
108 struct bfad_debug_info *fw_debug;
109 unsigned long flags;
110 int rc;
111
112 fw_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
113 if (!fw_debug)
114 return -ENOMEM;
115
116 fw_debug->buffer_len = sizeof(struct bfa_trc_mod_s);
117
118 fw_debug->debug_buffer = vzalloc(fw_debug->buffer_len);
119 if (!fw_debug->debug_buffer) {
120 kfree(fw_debug);
121 printk(KERN_INFO "bfad[%d]: Failed to allocate fwsave buffer\n",
122 bfad->inst_no);
123 return -ENOMEM;
124 }
125
126 spin_lock_irqsave(&bfad->bfad_lock, flags);
127 rc = bfa_ioc_debug_fwsave(&bfad->bfa.ioc,
128 fw_debug->debug_buffer,
129 &fw_debug->buffer_len);
130 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
131 if (rc != BFA_STATUS_OK) {
132 vfree(fw_debug->debug_buffer);
133 fw_debug->debug_buffer = NULL;
134 kfree(fw_debug);
135 printk(KERN_INFO "bfad[%d]: Failed to collect fwsave\n",
136 bfad->inst_no);
137 return -ENOMEM;
138 }
139
140 file->private_data = fw_debug;
141
142 return 0;
143 }
144
145 static int
bfad_debugfs_open_reg(struct inode * inode,struct file * file)146 bfad_debugfs_open_reg(struct inode *inode, struct file *file)
147 {
148 struct bfad_debug_info *reg_debug;
149
150 reg_debug = kzalloc(sizeof(struct bfad_debug_info), GFP_KERNEL);
151 if (!reg_debug)
152 return -ENOMEM;
153
154 reg_debug->i_private = inode->i_private;
155
156 file->private_data = reg_debug;
157
158 return 0;
159 }
160
161 /* Changes the current file position */
162 static loff_t
bfad_debugfs_lseek(struct file * file,loff_t offset,int orig)163 bfad_debugfs_lseek(struct file *file, loff_t offset, int orig)
164 {
165 struct bfad_debug_info *debug = file->private_data;
166 return fixed_size_llseek(file, offset, orig,
167 debug->buffer_len);
168 }
169
170 static ssize_t
bfad_debugfs_read(struct file * file,char __user * buf,size_t nbytes,loff_t * pos)171 bfad_debugfs_read(struct file *file, char __user *buf,
172 size_t nbytes, loff_t *pos)
173 {
174 struct bfad_debug_info *debug = file->private_data;
175
176 if (!debug || !debug->debug_buffer)
177 return 0;
178
179 return simple_read_from_buffer(buf, nbytes, pos,
180 debug->debug_buffer, debug->buffer_len);
181 }
182
183 #define BFA_REG_CT_ADDRSZ (0x40000)
184 #define BFA_REG_CB_ADDRSZ (0x20000)
185 #define BFA_REG_ADDRSZ(__ioc) \
186 ((u32)(bfa_asic_id_ctc(bfa_ioc_devid(__ioc)) ? \
187 BFA_REG_CT_ADDRSZ : BFA_REG_CB_ADDRSZ))
188 #define BFA_REG_ADDRMSK(__ioc) (BFA_REG_ADDRSZ(__ioc) - 1)
189
190 static bfa_status_t
bfad_reg_offset_check(struct bfa_s * bfa,u32 offset,u32 len)191 bfad_reg_offset_check(struct bfa_s *bfa, u32 offset, u32 len)
192 {
193 u8 area;
194
195 /* check [16:15] */
196 area = (offset >> 15) & 0x7;
197 if (area == 0) {
198 /* PCIe core register */
199 if ((offset + (len<<2)) > 0x8000) /* 8k dwords or 32KB */
200 return BFA_STATUS_EINVAL;
201 } else if (area == 0x1) {
202 /* CB 32 KB memory page */
203 if ((offset + (len<<2)) > 0x10000) /* 8k dwords or 32KB */
204 return BFA_STATUS_EINVAL;
205 } else {
206 /* CB register space 64KB */
207 if ((offset + (len<<2)) > BFA_REG_ADDRMSK(&bfa->ioc))
208 return BFA_STATUS_EINVAL;
209 }
210 return BFA_STATUS_OK;
211 }
212
213 static ssize_t
bfad_debugfs_read_regrd(struct file * file,char __user * buf,size_t nbytes,loff_t * pos)214 bfad_debugfs_read_regrd(struct file *file, char __user *buf,
215 size_t nbytes, loff_t *pos)
216 {
217 struct bfad_debug_info *regrd_debug = file->private_data;
218 struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
219 struct bfad_s *bfad = port->bfad;
220 ssize_t rc;
221
222 if (!bfad->regdata)
223 return 0;
224
225 rc = simple_read_from_buffer(buf, nbytes, pos,
226 bfad->regdata, bfad->reglen);
227
228 if ((*pos + nbytes) >= bfad->reglen) {
229 kfree(bfad->regdata);
230 bfad->regdata = NULL;
231 bfad->reglen = 0;
232 }
233
234 return rc;
235 }
236
237 static ssize_t
bfad_debugfs_write_regrd(struct file * file,const char __user * buf,size_t nbytes,loff_t * ppos)238 bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
239 size_t nbytes, loff_t *ppos)
240 {
241 struct bfad_debug_info *regrd_debug = file->private_data;
242 struct bfad_port_s *port = (struct bfad_port_s *)regrd_debug->i_private;
243 struct bfad_s *bfad = port->bfad;
244 struct bfa_s *bfa = &bfad->bfa;
245 struct bfa_ioc_s *ioc = &bfa->ioc;
246 int addr, rc, i;
247 u32 len;
248 u32 *regbuf;
249 void __iomem *rb, *reg_addr;
250 unsigned long flags;
251 void *kern_buf;
252
253 kern_buf = memdup_user(buf, nbytes);
254 if (IS_ERR(kern_buf))
255 return PTR_ERR(kern_buf);
256
257 rc = sscanf(kern_buf, "%x:%x", &addr, &len);
258 if (rc < 2 || len > (UINT_MAX >> 2)) {
259 printk(KERN_INFO
260 "bfad[%d]: %s failed to read user buf\n",
261 bfad->inst_no, __func__);
262 kfree(kern_buf);
263 return -EINVAL;
264 }
265
266 kfree(kern_buf);
267 kfree(bfad->regdata);
268 bfad->regdata = NULL;
269 bfad->reglen = 0;
270
271 bfad->regdata = kzalloc(len << 2, GFP_KERNEL);
272 if (!bfad->regdata) {
273 printk(KERN_INFO "bfad[%d]: Failed to allocate regrd buffer\n",
274 bfad->inst_no);
275 return -ENOMEM;
276 }
277
278 bfad->reglen = len << 2;
279 rb = bfa_ioc_bar0(ioc);
280 addr &= BFA_REG_ADDRMSK(ioc);
281
282 /* offset and len sanity check */
283 rc = bfad_reg_offset_check(bfa, addr, len);
284 if (rc) {
285 printk(KERN_INFO "bfad[%d]: Failed reg offset check\n",
286 bfad->inst_no);
287 kfree(bfad->regdata);
288 bfad->regdata = NULL;
289 bfad->reglen = 0;
290 return -EINVAL;
291 }
292
293 reg_addr = rb + addr;
294 regbuf = (u32 *)bfad->regdata;
295 spin_lock_irqsave(&bfad->bfad_lock, flags);
296 for (i = 0; i < len; i++) {
297 *regbuf = readl(reg_addr);
298 regbuf++;
299 reg_addr += sizeof(u32);
300 }
301 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
302
303 return nbytes;
304 }
305
306 static ssize_t
bfad_debugfs_write_regwr(struct file * file,const char __user * buf,size_t nbytes,loff_t * ppos)307 bfad_debugfs_write_regwr(struct file *file, const char __user *buf,
308 size_t nbytes, loff_t *ppos)
309 {
310 struct bfad_debug_info *debug = file->private_data;
311 struct bfad_port_s *port = (struct bfad_port_s *)debug->i_private;
312 struct bfad_s *bfad = port->bfad;
313 struct bfa_s *bfa = &bfad->bfa;
314 struct bfa_ioc_s *ioc = &bfa->ioc;
315 int addr, val, rc;
316 void __iomem *reg_addr;
317 unsigned long flags;
318 void *kern_buf;
319
320 kern_buf = memdup_user(buf, nbytes);
321 if (IS_ERR(kern_buf))
322 return PTR_ERR(kern_buf);
323
324 rc = sscanf(kern_buf, "%x:%x", &addr, &val);
325 if (rc < 2) {
326 printk(KERN_INFO
327 "bfad[%d]: %s failed to read user buf\n",
328 bfad->inst_no, __func__);
329 kfree(kern_buf);
330 return -EINVAL;
331 }
332 kfree(kern_buf);
333
334 addr &= BFA_REG_ADDRMSK(ioc); /* offset only 17 bit and word align */
335
336 /* offset and len sanity check */
337 rc = bfad_reg_offset_check(bfa, addr, 1);
338 if (rc) {
339 printk(KERN_INFO
340 "bfad[%d]: Failed reg offset check\n",
341 bfad->inst_no);
342 return -EINVAL;
343 }
344
345 reg_addr = (bfa_ioc_bar0(ioc)) + addr;
346 spin_lock_irqsave(&bfad->bfad_lock, flags);
347 writel(val, reg_addr);
348 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
349
350 return nbytes;
351 }
352
353 static int
bfad_debugfs_release(struct inode * inode,struct file * file)354 bfad_debugfs_release(struct inode *inode, struct file *file)
355 {
356 struct bfad_debug_info *debug = file->private_data;
357
358 if (!debug)
359 return 0;
360
361 file->private_data = NULL;
362 kfree(debug);
363 return 0;
364 }
365
366 static int
bfad_debugfs_release_fwtrc(struct inode * inode,struct file * file)367 bfad_debugfs_release_fwtrc(struct inode *inode, struct file *file)
368 {
369 struct bfad_debug_info *fw_debug = file->private_data;
370
371 if (!fw_debug)
372 return 0;
373
374 if (fw_debug->debug_buffer)
375 vfree(fw_debug->debug_buffer);
376
377 file->private_data = NULL;
378 kfree(fw_debug);
379 return 0;
380 }
381
382 static const struct file_operations bfad_debugfs_op_drvtrc = {
383 .owner = THIS_MODULE,
384 .open = bfad_debugfs_open_drvtrc,
385 .llseek = bfad_debugfs_lseek,
386 .read = bfad_debugfs_read,
387 .release = bfad_debugfs_release,
388 };
389
390 static const struct file_operations bfad_debugfs_op_fwtrc = {
391 .owner = THIS_MODULE,
392 .open = bfad_debugfs_open_fwtrc,
393 .llseek = bfad_debugfs_lseek,
394 .read = bfad_debugfs_read,
395 .release = bfad_debugfs_release_fwtrc,
396 };
397
398 static const struct file_operations bfad_debugfs_op_fwsave = {
399 .owner = THIS_MODULE,
400 .open = bfad_debugfs_open_fwsave,
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_regrd = {
407 .owner = THIS_MODULE,
408 .open = bfad_debugfs_open_reg,
409 .llseek = bfad_debugfs_lseek,
410 .read = bfad_debugfs_read_regrd,
411 .write = bfad_debugfs_write_regrd,
412 .release = bfad_debugfs_release,
413 };
414
415 static const struct file_operations bfad_debugfs_op_regwr = {
416 .owner = THIS_MODULE,
417 .open = bfad_debugfs_open_reg,
418 .llseek = bfad_debugfs_lseek,
419 .write = bfad_debugfs_write_regwr,
420 .release = bfad_debugfs_release,
421 };
422
423 struct bfad_debugfs_entry {
424 const char *name;
425 umode_t mode;
426 const struct file_operations *fops;
427 };
428
429 static const struct bfad_debugfs_entry bfad_debugfs_files[] = {
430 { "drvtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_drvtrc, },
431 { "fwtrc", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwtrc, },
432 { "fwsave", S_IFREG|S_IRUGO, &bfad_debugfs_op_fwsave, },
433 { "regrd", S_IFREG|S_IRUGO|S_IWUSR, &bfad_debugfs_op_regrd, },
434 { "regwr", S_IFREG|S_IWUSR, &bfad_debugfs_op_regwr, },
435 };
436
437 static struct dentry *bfa_debugfs_root;
438 static atomic_t bfa_debugfs_port_count;
439
440 inline void
bfad_debugfs_init(struct bfad_port_s * port)441 bfad_debugfs_init(struct bfad_port_s *port)
442 {
443 struct bfad_s *bfad = port->bfad;
444 const struct bfad_debugfs_entry *file;
445 char name[64];
446 int i;
447
448 if (!bfa_debugfs_enable)
449 return;
450
451 /* Setup the BFA debugfs root directory*/
452 if (!bfa_debugfs_root) {
453 bfa_debugfs_root = debugfs_create_dir("bfa", NULL);
454 atomic_set(&bfa_debugfs_port_count, 0);
455 }
456
457 /* Setup the pci_dev debugfs directory for the port */
458 snprintf(name, sizeof(name), "pci_dev:%s", bfad->pci_name);
459 if (!port->port_debugfs_root) {
460 port->port_debugfs_root =
461 debugfs_create_dir(name, bfa_debugfs_root);
462
463 atomic_inc(&bfa_debugfs_port_count);
464
465 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
466 file = &bfad_debugfs_files[i];
467 bfad->bfad_dentry_files[i] =
468 debugfs_create_file(file->name,
469 file->mode,
470 port->port_debugfs_root,
471 port,
472 file->fops);
473 }
474 }
475
476 return;
477 }
478
479 inline void
bfad_debugfs_exit(struct bfad_port_s * port)480 bfad_debugfs_exit(struct bfad_port_s *port)
481 {
482 struct bfad_s *bfad = port->bfad;
483 int i;
484
485 for (i = 0; i < ARRAY_SIZE(bfad_debugfs_files); i++) {
486 if (bfad->bfad_dentry_files[i]) {
487 debugfs_remove(bfad->bfad_dentry_files[i]);
488 bfad->bfad_dentry_files[i] = NULL;
489 }
490 }
491
492 /* Remove the pci_dev debugfs directory for the port */
493 if (port->port_debugfs_root) {
494 debugfs_remove(port->port_debugfs_root);
495 port->port_debugfs_root = NULL;
496 atomic_dec(&bfa_debugfs_port_count);
497 }
498
499 /* Remove the BFA debugfs root directory */
500 if (atomic_read(&bfa_debugfs_port_count) == 0) {
501 debugfs_remove(bfa_debugfs_root);
502 bfa_debugfs_root = NULL;
503 }
504 }
505