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 | * | |
c9101c5b | 6 | * Copyright 2004 IBM Corporation |
1da177e4 LT |
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> | |
c9101c5b | 24 | #include <net/iucv/iucv.h> |
1da177e4 LT |
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]; | |
c9101c5b | 63 | struct iucv_path *path; |
1da177e4 LT |
64 | int connection_established; |
65 | int iucv_path_severed; | |
c9101c5b | 66 | struct iucv_message local_interrupt_buffer; |
1da177e4 | 67 | atomic_t receive_ready; |
1da177e4 LT |
68 | int minor_num; |
69 | char * buffer; | |
70 | char * current_position; | |
71 | int remaining; | |
72 | ulong residual_length; | |
73 | int buffer_free; | |
74 | int dev_in_use; /* 1: already opened, 0: not opened*/ | |
75 | spinlock_t priv_lock; | |
76 | struct device *device; | |
7f021ce1 | 77 | struct device *class_device; |
1da177e4 LT |
78 | int autorecording; |
79 | int autopurge; | |
80 | }; | |
81 | ||
82 | ||
83 | /* | |
84 | * File operation structure for vmlogrdr devices | |
85 | */ | |
86 | static int vmlogrdr_open(struct inode *, struct file *); | |
87 | static int vmlogrdr_release(struct inode *, struct file *); | |
d2c993d8 HC |
88 | static ssize_t vmlogrdr_read (struct file *filp, char __user *data, |
89 | size_t count, loff_t * ppos); | |
1da177e4 | 90 | |
d54b1fdb | 91 | static const struct file_operations vmlogrdr_fops = { |
1da177e4 LT |
92 | .owner = THIS_MODULE, |
93 | .open = vmlogrdr_open, | |
94 | .release = vmlogrdr_release, | |
95 | .read = vmlogrdr_read, | |
96 | }; | |
97 | ||
98 | ||
c9101c5b MS |
99 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]); |
100 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]); | |
101 | static void vmlogrdr_iucv_message_pending(struct iucv_path *, | |
102 | struct iucv_message *); | |
1da177e4 LT |
103 | |
104 | ||
c9101c5b MS |
105 | static struct iucv_handler vmlogrdr_iucv_handler = { |
106 | .path_complete = vmlogrdr_iucv_path_complete, | |
107 | .path_severed = vmlogrdr_iucv_path_severed, | |
108 | .message_pending = vmlogrdr_iucv_message_pending, | |
1da177e4 LT |
109 | }; |
110 | ||
111 | ||
2b67fc46 HC |
112 | static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); |
113 | static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
1da177e4 LT |
114 | |
115 | /* | |
116 | * pointer to system service private structure | |
117 | * minor number 0 --> logrec | |
118 | * minor number 1 --> account | |
119 | * minor number 2 --> symptom | |
120 | */ | |
121 | ||
122 | static struct vmlogrdr_priv_t sys_ser[] = { | |
123 | { .system_service = "*LOGREC ", | |
124 | .internal_name = "logrec", | |
125 | .recording_name = "EREP", | |
126 | .minor_num = 0, | |
127 | .buffer_free = 1, | |
cb629a01 | 128 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), |
1da177e4 LT |
129 | .autorecording = 1, |
130 | .autopurge = 1, | |
131 | }, | |
132 | { .system_service = "*ACCOUNT", | |
133 | .internal_name = "account", | |
134 | .recording_name = "ACCOUNT", | |
135 | .minor_num = 1, | |
136 | .buffer_free = 1, | |
cb629a01 | 137 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), |
1da177e4 LT |
138 | .autorecording = 1, |
139 | .autopurge = 1, | |
140 | }, | |
141 | { .system_service = "*SYMPTOM", | |
142 | .internal_name = "symptom", | |
143 | .recording_name = "SYMPTOM", | |
144 | .minor_num = 2, | |
145 | .buffer_free = 1, | |
cb629a01 | 146 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), |
1da177e4 LT |
147 | .autorecording = 1, |
148 | .autopurge = 1, | |
149 | } | |
150 | }; | |
151 | ||
152 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
153 | ||
154 | static char FENCE[] = {"EOR"}; | |
155 | static int vmlogrdr_major = 0; | |
156 | static struct cdev *vmlogrdr_cdev = NULL; | |
157 | static int recording_class_AB; | |
158 | ||
159 | ||
c9101c5b | 160 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 161 | { |
c9101c5b MS |
162 | struct vmlogrdr_priv_t * logptr = path->private; |
163 | ||
1da177e4 LT |
164 | spin_lock(&logptr->priv_lock); |
165 | logptr->connection_established = 1; | |
166 | spin_unlock(&logptr->priv_lock); | |
167 | wake_up(&conn_wait_queue); | |
1da177e4 LT |
168 | } |
169 | ||
170 | ||
c9101c5b | 171 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 172 | { |
c9101c5b MS |
173 | struct vmlogrdr_priv_t * logptr = path->private; |
174 | u8 reason = (u8) ipuser[8]; | |
1da177e4 LT |
175 | |
176 | printk (KERN_ERR "vmlogrdr: connection severed with" | |
177 | " reason %i\n", reason); | |
178 | ||
c9101c5b MS |
179 | iucv_path_sever(path, NULL); |
180 | kfree(path); | |
181 | logptr->path = NULL; | |
182 | ||
1da177e4 LT |
183 | spin_lock(&logptr->priv_lock); |
184 | logptr->connection_established = 0; | |
185 | logptr->iucv_path_severed = 1; | |
186 | spin_unlock(&logptr->priv_lock); | |
187 | ||
188 | wake_up(&conn_wait_queue); | |
189 | /* just in case we're sleeping waiting for a record */ | |
190 | wake_up_interruptible(&read_wait_queue); | |
191 | } | |
192 | ||
193 | ||
c9101c5b MS |
194 | static void vmlogrdr_iucv_message_pending(struct iucv_path *path, |
195 | struct iucv_message *msg) | |
1da177e4 | 196 | { |
c9101c5b | 197 | struct vmlogrdr_priv_t * logptr = path->private; |
1da177e4 LT |
198 | |
199 | /* | |
200 | * This function is the bottom half so it should be quick. | |
201 | * Copy the external interrupt data into our local eib and increment | |
202 | * the usage count | |
203 | */ | |
204 | spin_lock(&logptr->priv_lock); | |
c9101c5b | 205 | memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); |
1da177e4 LT |
206 | atomic_inc(&logptr->receive_ready); |
207 | spin_unlock(&logptr->priv_lock); | |
208 | wake_up_interruptible(&read_wait_queue); | |
209 | } | |
210 | ||
211 | ||
c9101c5b MS |
212 | static int vmlogrdr_get_recording_class_AB(void) |
213 | { | |
1da177e4 LT |
214 | char cp_command[]="QUERY COMMAND RECORDING "; |
215 | char cp_response[80]; | |
216 | char *tail; | |
217 | int len,i; | |
218 | ||
219 | printk (KERN_DEBUG "vmlogrdr: query command: %s\n", cp_command); | |
6b979de3 | 220 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
221 | printk (KERN_DEBUG "vmlogrdr: response: %s", cp_response); |
222 | len = strnlen(cp_response,sizeof(cp_response)); | |
223 | // now the parsing | |
224 | tail=strnchr(cp_response,len,'='); | |
225 | if (!tail) | |
226 | return 0; | |
227 | tail++; | |
228 | if (!strncmp("ANY",tail,3)) | |
229 | return 1; | |
230 | if (!strncmp("NONE",tail,4)) | |
231 | return 0; | |
232 | /* | |
233 | * expect comma separated list of classes here, if one of them | |
234 | * is A or B return 1 otherwise 0 | |
235 | */ | |
236 | for (i=tail-cp_response; i<len; i++) | |
237 | if ( cp_response[i]=='A' || cp_response[i]=='B' ) | |
238 | return 1; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | ||
c9101c5b MS |
243 | static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, |
244 | int action, int purge) | |
245 | { | |
1da177e4 LT |
246 | |
247 | char cp_command[80]; | |
248 | char cp_response[160]; | |
249 | char *onoff, *qid_string; | |
250 | ||
251 | memset(cp_command, 0x00, sizeof(cp_command)); | |
252 | memset(cp_response, 0x00, sizeof(cp_response)); | |
253 | ||
254 | onoff = ((action == 1) ? "ON" : "OFF"); | |
255 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); | |
256 | ||
257 | /* | |
258 | * The recording commands needs to be called with option QID | |
259 | * for guests that have previlege classes A or B. | |
260 | * Purging has to be done as separate step, because recording | |
261 | * can't be switched on as long as records are on the queue. | |
262 | * Doing both at the same time doesn't work. | |
263 | */ | |
264 | ||
265 | if (purge) { | |
266 | snprintf(cp_command, sizeof(cp_command), | |
267 | "RECORDING %s PURGE %s", | |
268 | logptr->recording_name, | |
269 | qid_string); | |
270 | ||
271 | printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", | |
272 | cp_command); | |
6b979de3 | 273 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
274 | printk (KERN_DEBUG "vmlogrdr: recording response: %s", |
275 | cp_response); | |
276 | } | |
277 | ||
278 | memset(cp_command, 0x00, sizeof(cp_command)); | |
279 | memset(cp_response, 0x00, sizeof(cp_response)); | |
280 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
281 | logptr->recording_name, | |
282 | onoff, | |
283 | qid_string); | |
284 | ||
285 | printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command); | |
6b979de3 | 286 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
287 | printk (KERN_DEBUG "vmlogrdr: recording response: %s", |
288 | cp_response); | |
289 | /* The recording command will usually answer with 'Command complete' | |
290 | * on success, but when the specific service was never connected | |
291 | * before then there might be an additional informational message | |
292 | * 'HCPCRC8072I Recording entry not found' before the | |
293 | * 'Command complete'. So I use strstr rather then the strncmp. | |
294 | */ | |
295 | if (strstr(cp_response,"Command complete")) | |
296 | return 0; | |
297 | else | |
298 | return -EIO; | |
299 | ||
300 | } | |
301 | ||
302 | ||
c9101c5b | 303 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
304 | { |
305 | int dev_num = 0; | |
306 | struct vmlogrdr_priv_t * logptr = NULL; | |
307 | int connect_rc = 0; | |
308 | int ret; | |
309 | ||
310 | dev_num = iminor(inode); | |
311 | if (dev_num > MAXMINOR) | |
312 | return -ENODEV; | |
1da177e4 | 313 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
314 | |
315 | /* | |
316 | * only allow for blocking reads to be open | |
317 | */ | |
318 | if (filp->f_flags & O_NONBLOCK) | |
319 | return -ENOSYS; | |
320 | ||
321 | /* Besure this device hasn't already been opened */ | |
322 | spin_lock_bh(&logptr->priv_lock); | |
323 | if (logptr->dev_in_use) { | |
324 | spin_unlock_bh(&logptr->priv_lock); | |
325 | return -EBUSY; | |
1da177e4 | 326 | } |
c9101c5b MS |
327 | logptr->dev_in_use = 1; |
328 | logptr->connection_established = 0; | |
329 | logptr->iucv_path_severed = 0; | |
1da177e4 LT |
330 | atomic_set(&logptr->receive_ready, 0); |
331 | logptr->buffer_free = 1; | |
c9101c5b | 332 | spin_unlock_bh(&logptr->priv_lock); |
1da177e4 LT |
333 | |
334 | /* set the file options */ | |
335 | filp->private_data = logptr; | |
336 | filp->f_op = &vmlogrdr_fops; | |
337 | ||
338 | /* start recording for this service*/ | |
c9101c5b | 339 | if (logptr->autorecording) { |
1da177e4 | 340 | ret = vmlogrdr_recording(logptr,1,logptr->autopurge); |
c9101c5b MS |
341 | if (ret) |
342 | printk (KERN_WARNING "vmlogrdr: failed to start " | |
343 | "recording automatically\n"); | |
1da177e4 LT |
344 | } |
345 | ||
346 | /* create connection to the system service */ | |
c9101c5b MS |
347 | logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL); |
348 | if (!logptr->path) | |
349 | goto out_dev; | |
350 | connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler, | |
351 | logptr->system_service, NULL, NULL, | |
352 | logptr); | |
1da177e4 LT |
353 | if (connect_rc) { |
354 | printk (KERN_ERR "vmlogrdr: iucv connection to %s " | |
355 | "failed with rc %i \n", logptr->system_service, | |
356 | connect_rc); | |
c9101c5b | 357 | goto out_path; |
1da177e4 LT |
358 | } |
359 | ||
360 | /* We've issued the connect and now we must wait for a | |
361 | * ConnectionComplete or ConnectinSevered Interrupt | |
362 | * before we can continue to process. | |
363 | */ | |
364 | wait_event(conn_wait_queue, (logptr->connection_established) | |
365 | || (logptr->iucv_path_severed)); | |
c9101c5b MS |
366 | if (logptr->iucv_path_severed) |
367 | goto out_record; | |
1da177e4 LT |
368 | return nonseekable_open(inode, filp); |
369 | ||
c9101c5b | 370 | out_record: |
1da177e4 LT |
371 | if (logptr->autorecording) |
372 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
c9101c5b MS |
373 | out_path: |
374 | kfree(logptr->path); /* kfree(NULL) is ok. */ | |
375 | logptr->path = NULL; | |
376 | out_dev: | |
1da177e4 LT |
377 | logptr->dev_in_use = 0; |
378 | return -EIO; | |
1da177e4 LT |
379 | } |
380 | ||
381 | ||
c9101c5b | 382 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
383 | { |
384 | int ret; | |
385 | ||
386 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
387 | ||
66b494a7 UB |
388 | iucv_path_sever(logptr->path, NULL); |
389 | kfree(logptr->path); | |
390 | logptr->path = NULL; | |
1da177e4 LT |
391 | if (logptr->autorecording) { |
392 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
393 | if (ret) | |
394 | printk (KERN_WARNING "vmlogrdr: failed to stop " | |
395 | "recording automatically\n"); | |
396 | } | |
397 | logptr->dev_in_use = 0; | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | ||
c9101c5b MS |
403 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
404 | { | |
1da177e4 LT |
405 | int rc, *temp; |
406 | /* we need to keep track of two data sizes here: | |
407 | * The number of bytes we need to receive from iucv and | |
408 | * the total number of bytes we actually write into the buffer. | |
409 | */ | |
410 | int user_data_count, iucv_data_count; | |
411 | char * buffer; | |
412 | ||
413 | if (atomic_read(&priv->receive_ready)) { | |
414 | spin_lock_bh(&priv->priv_lock); | |
415 | if (priv->residual_length){ | |
416 | /* receive second half of a record */ | |
417 | iucv_data_count = priv->residual_length; | |
418 | user_data_count = 0; | |
419 | buffer = priv->buffer; | |
420 | } else { | |
421 | /* receive a new record: | |
422 | * We need to return the total length of the record | |
423 | * + size of FENCE in the first 4 bytes of the buffer. | |
424 | */ | |
c9101c5b | 425 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
426 | user_data_count = sizeof(int); |
427 | temp = (int*)priv->buffer; | |
428 | *temp= iucv_data_count + sizeof(FENCE); | |
429 | buffer = priv->buffer + sizeof(int); | |
430 | } | |
431 | /* | |
432 | * If the record is bigger then our buffer, we receive only | |
433 | * a part of it. We can get the rest later. | |
434 | */ | |
435 | if (iucv_data_count > NET_BUFFER_SIZE) | |
436 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
437 | rc = iucv_message_receive(priv->path, |
438 | &priv->local_interrupt_buffer, | |
439 | 0, buffer, iucv_data_count, | |
440 | &priv->residual_length); | |
1da177e4 LT |
441 | spin_unlock_bh(&priv->priv_lock); |
442 | /* An rc of 5 indicates that the record was bigger then | |
443 | * the buffer, which is OK for us. A 9 indicates that the | |
444 | * record was purged befor we could receive it. | |
445 | */ | |
446 | if (rc == 5) | |
447 | rc = 0; | |
448 | if (rc == 9) | |
449 | atomic_set(&priv->receive_ready, 0); | |
450 | } else { | |
451 | rc = 1; | |
452 | } | |
453 | if (!rc) { | |
454 | priv->buffer_free = 0; | |
455 | user_data_count += iucv_data_count; | |
456 | priv->current_position = priv->buffer; | |
457 | if (priv->residual_length == 0){ | |
458 | /* the whole record has been captured, | |
459 | * now add the fence */ | |
460 | atomic_dec(&priv->receive_ready); | |
461 | buffer = priv->buffer + user_data_count; | |
462 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
463 | user_data_count += sizeof(FENCE); | |
464 | } | |
465 | priv->remaining = user_data_count; | |
466 | } | |
467 | ||
468 | return rc; | |
469 | } | |
470 | ||
471 | ||
c9101c5b MS |
472 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
473 | size_t count, loff_t * ppos) | |
1da177e4 LT |
474 | { |
475 | int rc; | |
476 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
477 | ||
478 | while (priv->buffer_free) { | |
479 | rc = vmlogrdr_receive_data(priv); | |
480 | if (rc) { | |
481 | rc = wait_event_interruptible(read_wait_queue, | |
482 | atomic_read(&priv->receive_ready)); | |
483 | if (rc) | |
484 | return rc; | |
485 | } | |
486 | } | |
487 | /* copy only up to end of record */ | |
488 | if (count > priv->remaining) | |
489 | count = priv->remaining; | |
490 | ||
491 | if (copy_to_user(data, priv->current_position, count)) | |
492 | return -EFAULT; | |
493 | ||
494 | *ppos += count; | |
495 | priv->current_position += count; | |
496 | priv->remaining -= count; | |
497 | ||
498 | /* if all data has been transferred, set buffer free */ | |
499 | if (priv->remaining == 0) | |
500 | priv->buffer_free = 1; | |
501 | ||
502 | return count; | |
503 | } | |
504 | ||
c9101c5b MS |
505 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
506 | struct device_attribute *attr, | |
507 | const char * buf, size_t count) | |
508 | { | |
1da177e4 LT |
509 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
510 | ssize_t ret = count; | |
511 | ||
512 | switch (buf[0]) { | |
513 | case '0': | |
514 | priv->autopurge=0; | |
515 | break; | |
516 | case '1': | |
517 | priv->autopurge=1; | |
518 | break; | |
519 | default: | |
520 | ret = -EINVAL; | |
521 | } | |
522 | return ret; | |
523 | } | |
524 | ||
525 | ||
c9101c5b MS |
526 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
527 | struct device_attribute *attr, | |
528 | char *buf) | |
529 | { | |
1da177e4 LT |
530 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
531 | return sprintf(buf, "%u\n", priv->autopurge); | |
532 | } | |
533 | ||
534 | ||
535 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
536 | vmlogrdr_autopurge_store); | |
537 | ||
538 | ||
c9101c5b MS |
539 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
540 | struct device_attribute *attr, | |
541 | const char * buf, size_t count) | |
542 | { | |
1da177e4 LT |
543 | |
544 | char cp_command[80]; | |
545 | char cp_response[80]; | |
546 | struct vmlogrdr_priv_t *priv = dev->driver_data; | |
547 | ||
548 | if (buf[0] != '1') | |
549 | return -EINVAL; | |
550 | ||
551 | memset(cp_command, 0x00, sizeof(cp_command)); | |
552 | memset(cp_response, 0x00, sizeof(cp_response)); | |
553 | ||
554 | /* | |
555 | * The recording command needs to be called with option QID | |
556 | * for guests that have previlege classes A or B. | |
557 | * Other guests will not recognize the command and we have to | |
558 | * issue the same command without the QID parameter. | |
559 | */ | |
560 | ||
561 | if (recording_class_AB) | |
562 | snprintf(cp_command, sizeof(cp_command), | |
563 | "RECORDING %s PURGE QID * ", | |
564 | priv->recording_name); | |
565 | else | |
566 | snprintf(cp_command, sizeof(cp_command), | |
567 | "RECORDING %s PURGE ", | |
568 | priv->recording_name); | |
569 | ||
570 | printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command); | |
6b979de3 | 571 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
572 | printk (KERN_DEBUG "vmlogrdr: recording response: %s", |
573 | cp_response); | |
574 | ||
575 | return count; | |
576 | } | |
577 | ||
578 | ||
579 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
580 | ||
581 | ||
c9101c5b MS |
582 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
583 | struct device_attribute *attr, | |
584 | const char *buf, size_t count) | |
585 | { | |
1da177e4 LT |
586 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
587 | ssize_t ret = count; | |
588 | ||
589 | switch (buf[0]) { | |
590 | case '0': | |
591 | priv->autorecording=0; | |
592 | break; | |
593 | case '1': | |
594 | priv->autorecording=1; | |
595 | break; | |
596 | default: | |
597 | ret = -EINVAL; | |
598 | } | |
599 | return ret; | |
600 | } | |
601 | ||
602 | ||
c9101c5b MS |
603 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
604 | struct device_attribute *attr, | |
605 | char *buf) | |
606 | { | |
1da177e4 LT |
607 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
608 | return sprintf(buf, "%u\n", priv->autorecording); | |
609 | } | |
610 | ||
611 | ||
612 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
613 | vmlogrdr_autorecording_store); | |
614 | ||
615 | ||
c9101c5b MS |
616 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
617 | struct device_attribute *attr, | |
618 | const char * buf, size_t count) | |
619 | { | |
1da177e4 LT |
620 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
621 | ssize_t ret; | |
622 | ||
623 | switch (buf[0]) { | |
624 | case '0': | |
625 | ret = vmlogrdr_recording(priv,0,0); | |
626 | break; | |
627 | case '1': | |
628 | ret = vmlogrdr_recording(priv,1,0); | |
629 | break; | |
630 | default: | |
631 | ret = -EINVAL; | |
632 | } | |
633 | if (ret) | |
634 | return ret; | |
635 | else | |
636 | return count; | |
637 | ||
638 | } | |
639 | ||
640 | ||
641 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
642 | ||
643 | ||
c9101c5b MS |
644 | static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver, |
645 | char *buf) | |
646 | { | |
1da177e4 LT |
647 | |
648 | char cp_command[] = "QUERY RECORDING "; | |
649 | int len; | |
650 | ||
6b979de3 | 651 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
652 | len = strlen(buf); |
653 | return len; | |
654 | } | |
655 | ||
656 | ||
657 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, | |
658 | NULL); | |
659 | ||
660 | static struct attribute *vmlogrdr_attrs[] = { | |
661 | &dev_attr_autopurge.attr, | |
662 | &dev_attr_purge.attr, | |
663 | &dev_attr_autorecording.attr, | |
664 | &dev_attr_recording.attr, | |
665 | NULL, | |
666 | }; | |
667 | ||
668 | static struct attribute_group vmlogrdr_attr_group = { | |
669 | .attrs = vmlogrdr_attrs, | |
670 | }; | |
671 | ||
56b22935 | 672 | static struct class *vmlogrdr_class; |
1da177e4 LT |
673 | static struct device_driver vmlogrdr_driver = { |
674 | .name = "vmlogrdr", | |
675 | .bus = &iucv_bus, | |
676 | }; | |
677 | ||
678 | ||
c9101c5b MS |
679 | static int vmlogrdr_register_driver(void) |
680 | { | |
1da177e4 LT |
681 | int ret; |
682 | ||
c9101c5b MS |
683 | /* Register with iucv driver */ |
684 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
685 | if (ret) { | |
ceb3dfba | 686 | printk (KERN_ERR "vmlogrdr: failed to register with " |
c9101c5b MS |
687 | "iucv driver\n"); |
688 | goto out; | |
689 | } | |
690 | ||
1da177e4 LT |
691 | ret = driver_register(&vmlogrdr_driver); |
692 | if (ret) { | |
693 | printk(KERN_ERR "vmlogrdr: failed to register driver.\n"); | |
c9101c5b | 694 | goto out_iucv; |
1da177e4 LT |
695 | } |
696 | ||
697 | ret = driver_create_file(&vmlogrdr_driver, | |
698 | &driver_attr_recording_status); | |
699 | if (ret) { | |
700 | printk(KERN_ERR "vmlogrdr: failed to add driver attribute.\n"); | |
c9101c5b | 701 | goto out_driver; |
1da177e4 LT |
702 | } |
703 | ||
56b22935 | 704 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 LT |
705 | if (IS_ERR(vmlogrdr_class)) { |
706 | printk(KERN_ERR "vmlogrdr: failed to create class.\n"); | |
c9101c5b MS |
707 | ret = PTR_ERR(vmlogrdr_class); |
708 | vmlogrdr_class = NULL; | |
709 | goto out_attr; | |
1da177e4 LT |
710 | } |
711 | return 0; | |
712 | ||
c9101c5b | 713 | out_attr: |
1da177e4 | 714 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); |
c9101c5b | 715 | out_driver: |
1da177e4 | 716 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
717 | out_iucv: |
718 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
719 | out: | |
1da177e4 LT |
720 | return ret; |
721 | } | |
722 | ||
723 | ||
c9101c5b MS |
724 | static void vmlogrdr_unregister_driver(void) |
725 | { | |
56b22935 | 726 | class_destroy(vmlogrdr_class); |
1da177e4 LT |
727 | vmlogrdr_class = NULL; |
728 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
729 | driver_unregister(&vmlogrdr_driver); | |
c9101c5b | 730 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
731 | } |
732 | ||
733 | ||
c9101c5b MS |
734 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
735 | { | |
1da177e4 LT |
736 | struct device *dev; |
737 | int ret; | |
738 | ||
88abaab4 | 739 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 740 | if (dev) { |
1da177e4 LT |
741 | snprintf(dev->bus_id, BUS_ID_SIZE, "%s", |
742 | priv->internal_name); | |
743 | dev->bus = &iucv_bus; | |
744 | dev->parent = iucv_root; | |
745 | dev->driver = &vmlogrdr_driver; | |
746 | /* | |
747 | * The release function could be called after the | |
748 | * module has been unloaded. It's _only_ task is to | |
749 | * free the struct. Therefore, we specify kfree() | |
750 | * directly here. (Probably a little bit obfuscating | |
751 | * but legitime ...). | |
752 | */ | |
753 | dev->release = (void (*)(struct device *))kfree; | |
754 | } else | |
755 | return -ENOMEM; | |
756 | ret = device_register(dev); | |
757 | if (ret) | |
758 | return ret; | |
759 | ||
760 | ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group); | |
761 | if (ret) { | |
762 | device_unregister(dev); | |
763 | return ret; | |
764 | } | |
c5fb920a GKH |
765 | priv->class_device = device_create_drvdata(vmlogrdr_class, dev, |
766 | MKDEV(vmlogrdr_major, | |
767 | priv->minor_num), | |
768 | priv, "%s", dev->bus_id); | |
1da177e4 LT |
769 | if (IS_ERR(priv->class_device)) { |
770 | ret = PTR_ERR(priv->class_device); | |
771 | priv->class_device=NULL; | |
772 | sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group); | |
773 | device_unregister(dev); | |
774 | return ret; | |
775 | } | |
1da177e4 LT |
776 | priv->device = dev; |
777 | return 0; | |
778 | } | |
779 | ||
780 | ||
c9101c5b MS |
781 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
782 | { | |
7f021ce1 | 783 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 LT |
784 | if (priv->device != NULL) { |
785 | sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group); | |
786 | device_unregister(priv->device); | |
787 | priv->device=NULL; | |
788 | } | |
789 | return 0; | |
790 | } | |
791 | ||
792 | ||
c9101c5b MS |
793 | static int vmlogrdr_register_cdev(dev_t dev) |
794 | { | |
1da177e4 LT |
795 | int rc = 0; |
796 | vmlogrdr_cdev = cdev_alloc(); | |
797 | if (!vmlogrdr_cdev) { | |
798 | return -ENOMEM; | |
799 | } | |
800 | vmlogrdr_cdev->owner = THIS_MODULE; | |
801 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
802 | vmlogrdr_cdev->dev = dev; | |
803 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
804 | if (!rc) | |
805 | return 0; | |
806 | ||
807 | // cleanup: cdev is not fully registered, no cdev_del here! | |
808 | kobject_put(&vmlogrdr_cdev->kobj); | |
809 | vmlogrdr_cdev=NULL; | |
810 | return rc; | |
811 | } | |
812 | ||
813 | ||
c9101c5b MS |
814 | static void vmlogrdr_cleanup(void) |
815 | { | |
1da177e4 | 816 | int i; |
c9101c5b | 817 | |
1da177e4 LT |
818 | if (vmlogrdr_cdev) { |
819 | cdev_del(vmlogrdr_cdev); | |
820 | vmlogrdr_cdev=NULL; | |
821 | } | |
822 | for (i=0; i < MAXMINOR; ++i ) { | |
823 | vmlogrdr_unregister_device(&sys_ser[i]); | |
824 | free_page((unsigned long)sys_ser[i].buffer); | |
825 | } | |
826 | vmlogrdr_unregister_driver(); | |
827 | if (vmlogrdr_major) { | |
828 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
829 | vmlogrdr_major=0; | |
830 | } | |
831 | } | |
832 | ||
833 | ||
f60d8910 | 834 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
835 | { |
836 | int rc; | |
837 | int i; | |
838 | dev_t dev; | |
839 | ||
840 | if (! MACHINE_IS_VM) { | |
841 | printk (KERN_ERR "vmlogrdr: not running under VM, " | |
842 | "driver not loaded.\n"); | |
843 | return -ENODEV; | |
844 | } | |
845 | ||
846 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
847 | ||
848 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
849 | if (rc) | |
850 | return rc; | |
851 | vmlogrdr_major = MAJOR(dev); | |
852 | ||
853 | rc=vmlogrdr_register_driver(); | |
854 | if (rc) | |
855 | goto cleanup; | |
856 | ||
857 | for (i=0; i < MAXMINOR; ++i ) { | |
858 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
859 | if (!sys_ser[i].buffer) { | |
3cb2cea1 | 860 | rc = -ENOMEM; |
1da177e4 LT |
861 | break; |
862 | } | |
863 | sys_ser[i].current_position = sys_ser[i].buffer; | |
864 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
865 | if (rc) | |
866 | break; | |
867 | } | |
868 | if (rc) | |
869 | goto cleanup; | |
870 | ||
871 | rc = vmlogrdr_register_cdev(dev); | |
872 | if (rc) | |
873 | goto cleanup; | |
874 | printk (KERN_INFO "vmlogrdr: driver loaded\n"); | |
875 | return 0; | |
876 | ||
877 | cleanup: | |
878 | vmlogrdr_cleanup(); | |
879 | printk (KERN_ERR "vmlogrdr: driver not loaded.\n"); | |
880 | return rc; | |
881 | } | |
882 | ||
883 | ||
f60d8910 | 884 | static void __exit vmlogrdr_exit(void) |
1da177e4 LT |
885 | { |
886 | vmlogrdr_cleanup(); | |
887 | printk (KERN_INFO "vmlogrdr: driver unloaded\n"); | |
888 | return; | |
889 | } | |
890 | ||
891 | ||
892 | module_init(vmlogrdr_init); | |
893 | module_exit(vmlogrdr_exit); |