]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/vmlogrdr.c | |
3 | * character device driver for reading z/VM system service records | |
4 | * | |
5 | * | |
6 | * Copyright (C) 2004 IBM Corporation | |
7 | * character device driver for reading z/VM system service records, | |
8 | * Version 1.0 | |
9 | * Author(s): Xenia Tkatschow <xenia@us.ibm.com> | |
10 | * Stefan Weinhuber <wein@de.ibm.com> | |
11 | * | |
12 | */ | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <asm/atomic.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/cpcmd.h> | |
22 | #include <asm/debug.h> | |
23 | #include <asm/ebcdic.h> | |
24 | #include "../net/iucv.h" | |
25 | #include <linux/kmod.h> | |
26 | #include <linux/cdev.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/string.h> | |
29 | ||
30 | ||
31 | ||
32 | MODULE_AUTHOR | |
33 | ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n" | |
34 | " Stefan Weinhuber (wein@de.ibm.com)"); | |
35 | MODULE_DESCRIPTION ("Character device driver for reading z/VM " | |
36 | "system service records."); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | ||
40 | /* | |
41 | * The size of the buffer for iucv data transfer is one page, | |
42 | * but in addition to the data we read from iucv we also | |
43 | * place an integer and some characters into that buffer, | |
44 | * so the maximum size for record data is a little less then | |
45 | * one page. | |
46 | */ | |
47 | #define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE)) | |
48 | ||
49 | /* | |
50 | * The elements that are concurrently accessed by bottom halves are | |
51 | * connection_established, iucv_path_severed, local_interrupt_buffer | |
52 | * and receive_ready. The first three can be protected by | |
53 | * priv_lock. receive_ready is atomic, so it can be incremented and | |
54 | * decremented without holding a lock. | |
55 | * The variable dev_in_use needs to be protected by the lock, since | |
56 | * it's a flag used by open to make sure that the device is opened only | |
57 | * by one user at the same time. | |
58 | */ | |
59 | struct vmlogrdr_priv_t { | |
60 | char system_service[8]; | |
61 | char internal_name[8]; | |
62 | char recording_name[8]; | |
63 | u16 pathid; | |
64 | int connection_established; | |
65 | int iucv_path_severed; | |
66 | iucv_MessagePending local_interrupt_buffer; | |
67 | atomic_t receive_ready; | |
68 | iucv_handle_t iucv_handle; | |
69 | int minor_num; | |
70 | char * buffer; | |
71 | char * current_position; | |
72 | int remaining; | |
73 | ulong residual_length; | |
74 | int buffer_free; | |
75 | int dev_in_use; /* 1: already opened, 0: not opened*/ | |
76 | spinlock_t priv_lock; | |
77 | struct device *device; | |
78 | struct class_device *class_device; | |
79 | int autorecording; | |
80 | int autopurge; | |
81 | }; | |
82 | ||
83 | ||
84 | /* | |
85 | * File operation structure for vmlogrdr devices | |
86 | */ | |
87 | static int vmlogrdr_open(struct inode *, struct file *); | |
88 | static int vmlogrdr_release(struct inode *, struct file *); | |
89 | static ssize_t vmlogrdr_read (struct file *filp, char *data, size_t count, | |
90 | loff_t * ppos); | |
91 | ||
92 | static struct file_operations vmlogrdr_fops = { | |
93 | .owner = THIS_MODULE, | |
94 | .open = vmlogrdr_open, | |
95 | .release = vmlogrdr_release, | |
96 | .read = vmlogrdr_read, | |
97 | }; | |
98 | ||
99 | ||
100 | static u8 iucvMagic[16] = { | |
101 | 0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, | |
102 | 0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 | |
103 | }; | |
104 | ||
105 | ||
106 | static u8 mask[] = { | |
107 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
108 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
109 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
110 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
111 | }; | |
112 | ||
113 | ||
114 | static u8 iucv_host[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
115 | ||
116 | ||
117 | static void | |
118 | vmlogrdr_iucv_ConnectionComplete(iucv_ConnectionComplete *eib, void *pgm_data); | |
119 | static void | |
120 | vmlogrdr_iucv_ConnectionSevered(iucv_ConnectionSevered *eib, void *pgm_data); | |
121 | static void | |
122 | vmlogrdr_iucv_MessagePending(iucv_MessagePending *eib, void *pgm_data); | |
123 | ||
124 | ||
125 | static iucv_interrupt_ops_t vmlogrdr_iucvops = { | |
126 | .ConnectionComplete = vmlogrdr_iucv_ConnectionComplete, | |
127 | .ConnectionSevered = vmlogrdr_iucv_ConnectionSevered, | |
128 | .MessagePending = vmlogrdr_iucv_MessagePending, | |
129 | }; | |
130 | ||
131 | ||
132 | DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); | |
133 | DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
134 | ||
135 | /* | |
136 | * pointer to system service private structure | |
137 | * minor number 0 --> logrec | |
138 | * minor number 1 --> account | |
139 | * minor number 2 --> symptom | |
140 | */ | |
141 | ||
142 | static struct vmlogrdr_priv_t sys_ser[] = { | |
143 | { .system_service = "*LOGREC ", | |
144 | .internal_name = "logrec", | |
145 | .recording_name = "EREP", | |
146 | .minor_num = 0, | |
147 | .buffer_free = 1, | |
148 | .priv_lock = SPIN_LOCK_UNLOCKED, | |
149 | .autorecording = 1, | |
150 | .autopurge = 1, | |
151 | }, | |
152 | { .system_service = "*ACCOUNT", | |
153 | .internal_name = "account", | |
154 | .recording_name = "ACCOUNT", | |
155 | .minor_num = 1, | |
156 | .buffer_free = 1, | |
157 | .priv_lock = SPIN_LOCK_UNLOCKED, | |
158 | .autorecording = 1, | |
159 | .autopurge = 1, | |
160 | }, | |
161 | { .system_service = "*SYMPTOM", | |
162 | .internal_name = "symptom", | |
163 | .recording_name = "SYMPTOM", | |
164 | .minor_num = 2, | |
165 | .buffer_free = 1, | |
166 | .priv_lock = SPIN_LOCK_UNLOCKED, | |
167 | .autorecording = 1, | |
168 | .autopurge = 1, | |
169 | } | |
170 | }; | |
171 | ||
172 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
173 | ||
174 | static char FENCE[] = {"EOR"}; | |
175 | static int vmlogrdr_major = 0; | |
176 | static struct cdev *vmlogrdr_cdev = NULL; | |
177 | static int recording_class_AB; | |
178 | ||
179 | ||
180 | static void | |
181 | vmlogrdr_iucv_ConnectionComplete (iucv_ConnectionComplete * eib, | |
182 | void * pgm_data) | |
183 | { | |
184 | struct vmlogrdr_priv_t * logptr = pgm_data; | |
185 | spin_lock(&logptr->priv_lock); | |
186 | logptr->connection_established = 1; | |
187 | spin_unlock(&logptr->priv_lock); | |
188 | wake_up(&conn_wait_queue); | |
189 | return; | |
190 | } | |
191 | ||
192 | ||
193 | static void | |
194 | vmlogrdr_iucv_ConnectionSevered (iucv_ConnectionSevered * eib, void * pgm_data) | |
195 | { | |
196 | u8 reason = (u8) eib->ipuser[8]; | |
197 | struct vmlogrdr_priv_t * logptr = pgm_data; | |
198 | ||
199 | printk (KERN_ERR "vmlogrdr: connection severed with" | |
200 | " reason %i\n", reason); | |
201 | ||
202 | spin_lock(&logptr->priv_lock); | |
203 | logptr->connection_established = 0; | |
204 | logptr->iucv_path_severed = 1; | |
205 | spin_unlock(&logptr->priv_lock); | |
206 | ||
207 | wake_up(&conn_wait_queue); | |
208 | /* just in case we're sleeping waiting for a record */ | |
209 | wake_up_interruptible(&read_wait_queue); | |
210 | } | |
211 | ||
212 | ||
213 | static void | |
214 | vmlogrdr_iucv_MessagePending (iucv_MessagePending * eib, void * pgm_data) | |
215 | { | |
216 | struct vmlogrdr_priv_t * logptr = pgm_data; | |
217 | ||
218 | /* | |
219 | * This function is the bottom half so it should be quick. | |
220 | * Copy the external interrupt data into our local eib and increment | |
221 | * the usage count | |
222 | */ | |
223 | spin_lock(&logptr->priv_lock); | |
224 | memcpy(&(logptr->local_interrupt_buffer), eib, sizeof(*eib)); | |
225 | atomic_inc(&logptr->receive_ready); | |
226 | spin_unlock(&logptr->priv_lock); | |
227 | wake_up_interruptible(&read_wait_queue); | |
228 | } | |
229 | ||
230 | ||
231 | static int | |
232 | vmlogrdr_get_recording_class_AB(void) { | |
233 | char cp_command[]="QUERY COMMAND RECORDING "; | |
234 | char cp_response[80]; | |
235 | char *tail; | |
236 | int len,i; | |
237 | ||
238 | printk (KERN_DEBUG "vmlogrdr: query command: %s\n", cp_command); | |
239 | cpcmd(cp_command, cp_response, sizeof(cp_response)); | |
240 | printk (KERN_DEBUG "vmlogrdr: response: %s", cp_response); | |
241 | len = strnlen(cp_response,sizeof(cp_response)); | |
242 | // now the parsing | |
243 | tail=strnchr(cp_response,len,'='); | |
244 | if (!tail) | |
245 | return 0; | |
246 | tail++; | |
247 | if (!strncmp("ANY",tail,3)) | |
248 | return 1; | |
249 | if (!strncmp("NONE",tail,4)) | |
250 | return 0; | |
251 | /* | |
252 | * expect comma separated list of classes here, if one of them | |
253 | * is A or B return 1 otherwise 0 | |
254 | */ | |
255 | for (i=tail-cp_response; i<len; i++) | |
256 | if ( cp_response[i]=='A' || cp_response[i]=='B' ) | |
257 | return 1; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | ||
262 | static int | |
263 | vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, int action, int purge) { | |
264 | ||
265 | char cp_command[80]; | |
266 | char cp_response[160]; | |
267 | char *onoff, *qid_string; | |
268 | ||
269 | memset(cp_command, 0x00, sizeof(cp_command)); | |
270 | memset(cp_response, 0x00, sizeof(cp_response)); | |
271 | ||
272 | onoff = ((action == 1) ? "ON" : "OFF"); | |
273 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); | |
274 | ||
275 | /* | |
276 | * The recording commands needs to be called with option QID | |
277 | * for guests that have previlege classes A or B. | |
278 | * Purging has to be done as separate step, because recording | |
279 | * can't be switched on as long as records are on the queue. | |
280 | * Doing both at the same time doesn't work. | |
281 | */ | |
282 | ||
283 | if (purge) { | |
284 | snprintf(cp_command, sizeof(cp_command), | |
285 | "RECORDING %s PURGE %s", | |
286 | logptr->recording_name, | |
287 | qid_string); | |
288 | ||
289 | printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", | |
290 | cp_command); | |
291 | cpcmd(cp_command, cp_response, sizeof(cp_response)); | |
292 | printk (KERN_DEBUG "vmlogrdr: recording response: %s", | |
293 | cp_response); | |
294 | } | |
295 | ||
296 | memset(cp_command, 0x00, sizeof(cp_command)); | |
297 | memset(cp_response, 0x00, sizeof(cp_response)); | |
298 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
299 | logptr->recording_name, | |
300 | onoff, | |
301 | qid_string); | |
302 | ||
303 | printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command); | |
304 | cpcmd(cp_command, cp_response, sizeof(cp_response)); | |
305 | printk (KERN_DEBUG "vmlogrdr: recording response: %s", | |
306 | cp_response); | |
307 | /* The recording command will usually answer with 'Command complete' | |
308 | * on success, but when the specific service was never connected | |
309 | * before then there might be an additional informational message | |
310 | * 'HCPCRC8072I Recording entry not found' before the | |
311 | * 'Command complete'. So I use strstr rather then the strncmp. | |
312 | */ | |
313 | if (strstr(cp_response,"Command complete")) | |
314 | return 0; | |
315 | else | |
316 | return -EIO; | |
317 | ||
318 | } | |
319 | ||
320 | ||
321 | static int | |
322 | vmlogrdr_open (struct inode *inode, struct file *filp) | |
323 | { | |
324 | int dev_num = 0; | |
325 | struct vmlogrdr_priv_t * logptr = NULL; | |
326 | int connect_rc = 0; | |
327 | int ret; | |
328 | ||
329 | dev_num = iminor(inode); | |
330 | if (dev_num > MAXMINOR) | |
331 | return -ENODEV; | |
332 | ||
333 | logptr = &sys_ser[dev_num]; | |
334 | if (logptr == NULL) | |
335 | return -ENODEV; | |
336 | ||
337 | /* | |
338 | * only allow for blocking reads to be open | |
339 | */ | |
340 | if (filp->f_flags & O_NONBLOCK) | |
341 | return -ENOSYS; | |
342 | ||
343 | /* Besure this device hasn't already been opened */ | |
344 | spin_lock_bh(&logptr->priv_lock); | |
345 | if (logptr->dev_in_use) { | |
346 | spin_unlock_bh(&logptr->priv_lock); | |
347 | return -EBUSY; | |
348 | } else { | |
349 | logptr->dev_in_use = 1; | |
350 | spin_unlock_bh(&logptr->priv_lock); | |
351 | } | |
352 | ||
353 | atomic_set(&logptr->receive_ready, 0); | |
354 | logptr->buffer_free = 1; | |
355 | ||
356 | /* set the file options */ | |
357 | filp->private_data = logptr; | |
358 | filp->f_op = &vmlogrdr_fops; | |
359 | ||
360 | /* start recording for this service*/ | |
361 | ret=0; | |
362 | if (logptr->autorecording) | |
363 | ret = vmlogrdr_recording(logptr,1,logptr->autopurge); | |
364 | if (ret) | |
365 | printk (KERN_WARNING "vmlogrdr: failed to start " | |
366 | "recording automatically\n"); | |
367 | ||
368 | /* Register with iucv driver */ | |
369 | logptr->iucv_handle = iucv_register_program(iucvMagic, | |
370 | logptr->system_service, mask, &vmlogrdr_iucvops, | |
371 | logptr); | |
372 | ||
373 | if (logptr->iucv_handle == NULL) { | |
374 | printk (KERN_ERR "vmlogrdr: failed to register with" | |
375 | "iucv driver\n"); | |
376 | goto not_registered; | |
377 | } | |
378 | ||
379 | /* create connection to the system service */ | |
380 | spin_lock_bh(&logptr->priv_lock); | |
381 | logptr->connection_established = 0; | |
382 | logptr->iucv_path_severed = 0; | |
383 | spin_unlock_bh(&logptr->priv_lock); | |
384 | ||
385 | connect_rc = iucv_connect (&(logptr->pathid), 10, iucvMagic, | |
386 | logptr->system_service, iucv_host, 0, | |
387 | NULL, NULL, | |
388 | logptr->iucv_handle, NULL); | |
389 | if (connect_rc) { | |
390 | printk (KERN_ERR "vmlogrdr: iucv connection to %s " | |
391 | "failed with rc %i \n", logptr->system_service, | |
392 | connect_rc); | |
393 | goto not_connected; | |
394 | } | |
395 | ||
396 | /* We've issued the connect and now we must wait for a | |
397 | * ConnectionComplete or ConnectinSevered Interrupt | |
398 | * before we can continue to process. | |
399 | */ | |
400 | wait_event(conn_wait_queue, (logptr->connection_established) | |
401 | || (logptr->iucv_path_severed)); | |
402 | if (logptr->iucv_path_severed) { | |
403 | goto not_connected; | |
404 | } | |
405 | ||
406 | return nonseekable_open(inode, filp); | |
407 | ||
408 | not_connected: | |
409 | iucv_unregister_program(logptr->iucv_handle); | |
410 | logptr->iucv_handle = NULL; | |
411 | not_registered: | |
412 | if (logptr->autorecording) | |
413 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
414 | logptr->dev_in_use = 0; | |
415 | return -EIO; | |
416 | ||
417 | ||
418 | } | |
419 | ||
420 | ||
421 | static int | |
422 | vmlogrdr_release (struct inode *inode, struct file *filp) | |
423 | { | |
424 | int ret; | |
425 | ||
426 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
427 | ||
428 | iucv_unregister_program(logptr->iucv_handle); | |
429 | logptr->iucv_handle = NULL; | |
430 | ||
431 | if (logptr->autorecording) { | |
432 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
433 | if (ret) | |
434 | printk (KERN_WARNING "vmlogrdr: failed to stop " | |
435 | "recording automatically\n"); | |
436 | } | |
437 | logptr->dev_in_use = 0; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | ||
443 | static int | |
444 | vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) { | |
445 | int rc, *temp; | |
446 | /* we need to keep track of two data sizes here: | |
447 | * The number of bytes we need to receive from iucv and | |
448 | * the total number of bytes we actually write into the buffer. | |
449 | */ | |
450 | int user_data_count, iucv_data_count; | |
451 | char * buffer; | |
452 | ||
453 | if (atomic_read(&priv->receive_ready)) { | |
454 | spin_lock_bh(&priv->priv_lock); | |
455 | if (priv->residual_length){ | |
456 | /* receive second half of a record */ | |
457 | iucv_data_count = priv->residual_length; | |
458 | user_data_count = 0; | |
459 | buffer = priv->buffer; | |
460 | } else { | |
461 | /* receive a new record: | |
462 | * We need to return the total length of the record | |
463 | * + size of FENCE in the first 4 bytes of the buffer. | |
464 | */ | |
465 | iucv_data_count = | |
466 | priv->local_interrupt_buffer.ln1msg2.ipbfln1f; | |
467 | user_data_count = sizeof(int); | |
468 | temp = (int*)priv->buffer; | |
469 | *temp= iucv_data_count + sizeof(FENCE); | |
470 | buffer = priv->buffer + sizeof(int); | |
471 | } | |
472 | /* | |
473 | * If the record is bigger then our buffer, we receive only | |
474 | * a part of it. We can get the rest later. | |
475 | */ | |
476 | if (iucv_data_count > NET_BUFFER_SIZE) | |
477 | iucv_data_count = NET_BUFFER_SIZE; | |
478 | rc = iucv_receive(priv->pathid, | |
479 | priv->local_interrupt_buffer.ipmsgid, | |
480 | priv->local_interrupt_buffer.iptrgcls, | |
481 | buffer, | |
482 | iucv_data_count, | |
483 | NULL, | |
484 | NULL, | |
485 | &priv->residual_length); | |
486 | spin_unlock_bh(&priv->priv_lock); | |
487 | /* An rc of 5 indicates that the record was bigger then | |
488 | * the buffer, which is OK for us. A 9 indicates that the | |
489 | * record was purged befor we could receive it. | |
490 | */ | |
491 | if (rc == 5) | |
492 | rc = 0; | |
493 | if (rc == 9) | |
494 | atomic_set(&priv->receive_ready, 0); | |
495 | } else { | |
496 | rc = 1; | |
497 | } | |
498 | if (!rc) { | |
499 | priv->buffer_free = 0; | |
500 | user_data_count += iucv_data_count; | |
501 | priv->current_position = priv->buffer; | |
502 | if (priv->residual_length == 0){ | |
503 | /* the whole record has been captured, | |
504 | * now add the fence */ | |
505 | atomic_dec(&priv->receive_ready); | |
506 | buffer = priv->buffer + user_data_count; | |
507 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
508 | user_data_count += sizeof(FENCE); | |
509 | } | |
510 | priv->remaining = user_data_count; | |
511 | } | |
512 | ||
513 | return rc; | |
514 | } | |
515 | ||
516 | ||
517 | static ssize_t | |
518 | vmlogrdr_read (struct file *filp, char *data, size_t count, loff_t * ppos) | |
519 | { | |
520 | int rc; | |
521 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
522 | ||
523 | while (priv->buffer_free) { | |
524 | rc = vmlogrdr_receive_data(priv); | |
525 | if (rc) { | |
526 | rc = wait_event_interruptible(read_wait_queue, | |
527 | atomic_read(&priv->receive_ready)); | |
528 | if (rc) | |
529 | return rc; | |
530 | } | |
531 | } | |
532 | /* copy only up to end of record */ | |
533 | if (count > priv->remaining) | |
534 | count = priv->remaining; | |
535 | ||
536 | if (copy_to_user(data, priv->current_position, count)) | |
537 | return -EFAULT; | |
538 | ||
539 | *ppos += count; | |
540 | priv->current_position += count; | |
541 | priv->remaining -= count; | |
542 | ||
543 | /* if all data has been transferred, set buffer free */ | |
544 | if (priv->remaining == 0) | |
545 | priv->buffer_free = 1; | |
546 | ||
547 | return count; | |
548 | } | |
549 | ||
550 | static ssize_t | |
3fd3c0a5 | 551 | vmlogrdr_autopurge_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count) { |
1da177e4 LT |
552 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
553 | ssize_t ret = count; | |
554 | ||
555 | switch (buf[0]) { | |
556 | case '0': | |
557 | priv->autopurge=0; | |
558 | break; | |
559 | case '1': | |
560 | priv->autopurge=1; | |
561 | break; | |
562 | default: | |
563 | ret = -EINVAL; | |
564 | } | |
565 | return ret; | |
566 | } | |
567 | ||
568 | ||
569 | static ssize_t | |
3fd3c0a5 | 570 | vmlogrdr_autopurge_show(struct device *dev, struct device_attribute *attr, char *buf) { |
1da177e4 LT |
571 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
572 | return sprintf(buf, "%u\n", priv->autopurge); | |
573 | } | |
574 | ||
575 | ||
576 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
577 | vmlogrdr_autopurge_store); | |
578 | ||
579 | ||
580 | static ssize_t | |
3fd3c0a5 | 581 | vmlogrdr_purge_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count) { |
1da177e4 LT |
582 | |
583 | char cp_command[80]; | |
584 | char cp_response[80]; | |
585 | struct vmlogrdr_priv_t *priv = dev->driver_data; | |
586 | ||
587 | if (buf[0] != '1') | |
588 | return -EINVAL; | |
589 | ||
590 | memset(cp_command, 0x00, sizeof(cp_command)); | |
591 | memset(cp_response, 0x00, sizeof(cp_response)); | |
592 | ||
593 | /* | |
594 | * The recording command needs to be called with option QID | |
595 | * for guests that have previlege classes A or B. | |
596 | * Other guests will not recognize the command and we have to | |
597 | * issue the same command without the QID parameter. | |
598 | */ | |
599 | ||
600 | if (recording_class_AB) | |
601 | snprintf(cp_command, sizeof(cp_command), | |
602 | "RECORDING %s PURGE QID * ", | |
603 | priv->recording_name); | |
604 | else | |
605 | snprintf(cp_command, sizeof(cp_command), | |
606 | "RECORDING %s PURGE ", | |
607 | priv->recording_name); | |
608 | ||
609 | printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command); | |
610 | cpcmd(cp_command, cp_response, sizeof(cp_response)); | |
611 | printk (KERN_DEBUG "vmlogrdr: recording response: %s", | |
612 | cp_response); | |
613 | ||
614 | return count; | |
615 | } | |
616 | ||
617 | ||
618 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
619 | ||
620 | ||
621 | static ssize_t | |
3fd3c0a5 | 622 | vmlogrdr_autorecording_store(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
623 | size_t count) { |
624 | struct vmlogrdr_priv_t *priv = dev->driver_data; | |
625 | ssize_t ret = count; | |
626 | ||
627 | switch (buf[0]) { | |
628 | case '0': | |
629 | priv->autorecording=0; | |
630 | break; | |
631 | case '1': | |
632 | priv->autorecording=1; | |
633 | break; | |
634 | default: | |
635 | ret = -EINVAL; | |
636 | } | |
637 | return ret; | |
638 | } | |
639 | ||
640 | ||
641 | static ssize_t | |
3fd3c0a5 | 642 | vmlogrdr_autorecording_show(struct device *dev, struct device_attribute *attr, char *buf) { |
1da177e4 LT |
643 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
644 | return sprintf(buf, "%u\n", priv->autorecording); | |
645 | } | |
646 | ||
647 | ||
648 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
649 | vmlogrdr_autorecording_store); | |
650 | ||
651 | ||
652 | static ssize_t | |
3fd3c0a5 | 653 | vmlogrdr_recording_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count) { |
1da177e4 LT |
654 | |
655 | struct vmlogrdr_priv_t *priv = dev->driver_data; | |
656 | ssize_t ret; | |
657 | ||
658 | switch (buf[0]) { | |
659 | case '0': | |
660 | ret = vmlogrdr_recording(priv,0,0); | |
661 | break; | |
662 | case '1': | |
663 | ret = vmlogrdr_recording(priv,1,0); | |
664 | break; | |
665 | default: | |
666 | ret = -EINVAL; | |
667 | } | |
668 | if (ret) | |
669 | return ret; | |
670 | else | |
671 | return count; | |
672 | ||
673 | } | |
674 | ||
675 | ||
676 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
677 | ||
678 | ||
679 | static ssize_t | |
680 | vmlogrdr_recording_status_show(struct device_driver *driver, char *buf) { | |
681 | ||
682 | char cp_command[] = "QUERY RECORDING "; | |
683 | int len; | |
684 | ||
685 | cpcmd(cp_command, buf, 4096); | |
686 | len = strlen(buf); | |
687 | return len; | |
688 | } | |
689 | ||
690 | ||
691 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, | |
692 | NULL); | |
693 | ||
694 | static struct attribute *vmlogrdr_attrs[] = { | |
695 | &dev_attr_autopurge.attr, | |
696 | &dev_attr_purge.attr, | |
697 | &dev_attr_autorecording.attr, | |
698 | &dev_attr_recording.attr, | |
699 | NULL, | |
700 | }; | |
701 | ||
702 | static struct attribute_group vmlogrdr_attr_group = { | |
703 | .attrs = vmlogrdr_attrs, | |
704 | }; | |
705 | ||
56b22935 | 706 | static struct class *vmlogrdr_class; |
1da177e4 LT |
707 | static struct device_driver vmlogrdr_driver = { |
708 | .name = "vmlogrdr", | |
709 | .bus = &iucv_bus, | |
710 | }; | |
711 | ||
712 | ||
713 | static int | |
714 | vmlogrdr_register_driver(void) { | |
715 | int ret; | |
716 | ||
717 | ret = driver_register(&vmlogrdr_driver); | |
718 | if (ret) { | |
719 | printk(KERN_ERR "vmlogrdr: failed to register driver.\n"); | |
720 | return ret; | |
721 | } | |
722 | ||
723 | ret = driver_create_file(&vmlogrdr_driver, | |
724 | &driver_attr_recording_status); | |
725 | if (ret) { | |
726 | printk(KERN_ERR "vmlogrdr: failed to add driver attribute.\n"); | |
727 | goto unregdriver; | |
728 | } | |
729 | ||
56b22935 | 730 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 LT |
731 | if (IS_ERR(vmlogrdr_class)) { |
732 | printk(KERN_ERR "vmlogrdr: failed to create class.\n"); | |
733 | ret=PTR_ERR(vmlogrdr_class); | |
734 | vmlogrdr_class=NULL; | |
735 | goto unregattr; | |
736 | } | |
737 | return 0; | |
738 | ||
739 | unregattr: | |
740 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
741 | unregdriver: | |
742 | driver_unregister(&vmlogrdr_driver); | |
743 | return ret; | |
744 | } | |
745 | ||
746 | ||
747 | static void | |
748 | vmlogrdr_unregister_driver(void) { | |
56b22935 | 749 | class_destroy(vmlogrdr_class); |
1da177e4 LT |
750 | vmlogrdr_class = NULL; |
751 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
752 | driver_unregister(&vmlogrdr_driver); | |
753 | return; | |
754 | } | |
755 | ||
756 | ||
757 | static int | |
758 | vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) { | |
759 | struct device *dev; | |
760 | int ret; | |
761 | ||
762 | dev = kmalloc(sizeof(struct device), GFP_KERNEL); | |
763 | if (dev) { | |
764 | memset(dev, 0, sizeof(struct device)); | |
765 | snprintf(dev->bus_id, BUS_ID_SIZE, "%s", | |
766 | priv->internal_name); | |
767 | dev->bus = &iucv_bus; | |
768 | dev->parent = iucv_root; | |
769 | dev->driver = &vmlogrdr_driver; | |
770 | /* | |
771 | * The release function could be called after the | |
772 | * module has been unloaded. It's _only_ task is to | |
773 | * free the struct. Therefore, we specify kfree() | |
774 | * directly here. (Probably a little bit obfuscating | |
775 | * but legitime ...). | |
776 | */ | |
777 | dev->release = (void (*)(struct device *))kfree; | |
778 | } else | |
779 | return -ENOMEM; | |
780 | ret = device_register(dev); | |
781 | if (ret) | |
782 | return ret; | |
783 | ||
784 | ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group); | |
785 | if (ret) { | |
786 | device_unregister(dev); | |
787 | return ret; | |
788 | } | |
56b22935 | 789 | priv->class_device = class_device_create( |
1da177e4 LT |
790 | vmlogrdr_class, |
791 | MKDEV(vmlogrdr_major, priv->minor_num), | |
792 | dev, | |
793 | "%s", dev->bus_id ); | |
794 | if (IS_ERR(priv->class_device)) { | |
795 | ret = PTR_ERR(priv->class_device); | |
796 | priv->class_device=NULL; | |
797 | sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group); | |
798 | device_unregister(dev); | |
799 | return ret; | |
800 | } | |
801 | dev->driver_data = priv; | |
802 | priv->device = dev; | |
803 | return 0; | |
804 | } | |
805 | ||
806 | ||
807 | static int | |
808 | vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv ) { | |
56b22935 | 809 | class_device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 LT |
810 | if (priv->device != NULL) { |
811 | sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group); | |
812 | device_unregister(priv->device); | |
813 | priv->device=NULL; | |
814 | } | |
815 | return 0; | |
816 | } | |
817 | ||
818 | ||
819 | static int | |
820 | vmlogrdr_register_cdev(dev_t dev) { | |
821 | int rc = 0; | |
822 | vmlogrdr_cdev = cdev_alloc(); | |
823 | if (!vmlogrdr_cdev) { | |
824 | return -ENOMEM; | |
825 | } | |
826 | vmlogrdr_cdev->owner = THIS_MODULE; | |
827 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
828 | vmlogrdr_cdev->dev = dev; | |
829 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
830 | if (!rc) | |
831 | return 0; | |
832 | ||
833 | // cleanup: cdev is not fully registered, no cdev_del here! | |
834 | kobject_put(&vmlogrdr_cdev->kobj); | |
835 | vmlogrdr_cdev=NULL; | |
836 | return rc; | |
837 | } | |
838 | ||
839 | ||
840 | static void | |
841 | vmlogrdr_cleanup(void) { | |
842 | int i; | |
843 | if (vmlogrdr_cdev) { | |
844 | cdev_del(vmlogrdr_cdev); | |
845 | vmlogrdr_cdev=NULL; | |
846 | } | |
847 | for (i=0; i < MAXMINOR; ++i ) { | |
848 | vmlogrdr_unregister_device(&sys_ser[i]); | |
849 | free_page((unsigned long)sys_ser[i].buffer); | |
850 | } | |
851 | vmlogrdr_unregister_driver(); | |
852 | if (vmlogrdr_major) { | |
853 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
854 | vmlogrdr_major=0; | |
855 | } | |
856 | } | |
857 | ||
858 | ||
859 | static int | |
860 | vmlogrdr_init(void) | |
861 | { | |
862 | int rc; | |
863 | int i; | |
864 | dev_t dev; | |
865 | ||
866 | if (! MACHINE_IS_VM) { | |
867 | printk (KERN_ERR "vmlogrdr: not running under VM, " | |
868 | "driver not loaded.\n"); | |
869 | return -ENODEV; | |
870 | } | |
871 | ||
872 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
873 | ||
874 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
875 | if (rc) | |
876 | return rc; | |
877 | vmlogrdr_major = MAJOR(dev); | |
878 | ||
879 | rc=vmlogrdr_register_driver(); | |
880 | if (rc) | |
881 | goto cleanup; | |
882 | ||
883 | for (i=0; i < MAXMINOR; ++i ) { | |
884 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
885 | if (!sys_ser[i].buffer) { | |
886 | rc = ENOMEM; | |
887 | break; | |
888 | } | |
889 | sys_ser[i].current_position = sys_ser[i].buffer; | |
890 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
891 | if (rc) | |
892 | break; | |
893 | } | |
894 | if (rc) | |
895 | goto cleanup; | |
896 | ||
897 | rc = vmlogrdr_register_cdev(dev); | |
898 | if (rc) | |
899 | goto cleanup; | |
900 | printk (KERN_INFO "vmlogrdr: driver loaded\n"); | |
901 | return 0; | |
902 | ||
903 | cleanup: | |
904 | vmlogrdr_cleanup(); | |
905 | printk (KERN_ERR "vmlogrdr: driver not loaded.\n"); | |
906 | return rc; | |
907 | } | |
908 | ||
909 | ||
910 | static void | |
911 | vmlogrdr_exit(void) | |
912 | { | |
913 | vmlogrdr_cleanup(); | |
914 | printk (KERN_INFO "vmlogrdr: driver unloaded\n"); | |
915 | return; | |
916 | } | |
917 | ||
918 | ||
919 | module_init(vmlogrdr_init); | |
920 | module_exit(vmlogrdr_exit); |