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> | |
764a4a8e | 28 | #include <linux/smp_lock.h> |
1da177e4 LT |
29 | #include <linux/string.h> |
30 | ||
31 | ||
32 | ||
33 | MODULE_AUTHOR | |
34 | ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n" | |
35 | " Stefan Weinhuber (wein@de.ibm.com)"); | |
36 | MODULE_DESCRIPTION ("Character device driver for reading z/VM " | |
37 | "system service records."); | |
38 | MODULE_LICENSE("GPL"); | |
39 | ||
40 | ||
41 | /* | |
42 | * The size of the buffer for iucv data transfer is one page, | |
43 | * but in addition to the data we read from iucv we also | |
44 | * place an integer and some characters into that buffer, | |
45 | * so the maximum size for record data is a little less then | |
46 | * one page. | |
47 | */ | |
48 | #define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE)) | |
49 | ||
50 | /* | |
51 | * The elements that are concurrently accessed by bottom halves are | |
52 | * connection_established, iucv_path_severed, local_interrupt_buffer | |
53 | * and receive_ready. The first three can be protected by | |
54 | * priv_lock. receive_ready is atomic, so it can be incremented and | |
55 | * decremented without holding a lock. | |
56 | * The variable dev_in_use needs to be protected by the lock, since | |
57 | * it's a flag used by open to make sure that the device is opened only | |
58 | * by one user at the same time. | |
59 | */ | |
60 | struct vmlogrdr_priv_t { | |
61 | char system_service[8]; | |
62 | char internal_name[8]; | |
63 | char recording_name[8]; | |
c9101c5b | 64 | struct iucv_path *path; |
1da177e4 LT |
65 | int connection_established; |
66 | int iucv_path_severed; | |
c9101c5b | 67 | struct iucv_message local_interrupt_buffer; |
1da177e4 | 68 | atomic_t receive_ready; |
1da177e4 LT |
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; | |
7f021ce1 | 78 | struct device *class_device; |
1da177e4 LT |
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 *); | |
d2c993d8 HC |
89 | static ssize_t vmlogrdr_read (struct file *filp, char __user *data, |
90 | size_t count, loff_t * ppos); | |
1da177e4 | 91 | |
d54b1fdb | 92 | static const struct file_operations vmlogrdr_fops = { |
1da177e4 LT |
93 | .owner = THIS_MODULE, |
94 | .open = vmlogrdr_open, | |
95 | .release = vmlogrdr_release, | |
96 | .read = vmlogrdr_read, | |
97 | }; | |
98 | ||
99 | ||
c9101c5b MS |
100 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]); |
101 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]); | |
102 | static void vmlogrdr_iucv_message_pending(struct iucv_path *, | |
103 | struct iucv_message *); | |
1da177e4 LT |
104 | |
105 | ||
c9101c5b MS |
106 | static struct iucv_handler vmlogrdr_iucv_handler = { |
107 | .path_complete = vmlogrdr_iucv_path_complete, | |
108 | .path_severed = vmlogrdr_iucv_path_severed, | |
109 | .message_pending = vmlogrdr_iucv_message_pending, | |
1da177e4 LT |
110 | }; |
111 | ||
112 | ||
2b67fc46 HC |
113 | static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); |
114 | static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
1da177e4 LT |
115 | |
116 | /* | |
117 | * pointer to system service private structure | |
118 | * minor number 0 --> logrec | |
119 | * minor number 1 --> account | |
120 | * minor number 2 --> symptom | |
121 | */ | |
122 | ||
123 | static struct vmlogrdr_priv_t sys_ser[] = { | |
124 | { .system_service = "*LOGREC ", | |
125 | .internal_name = "logrec", | |
126 | .recording_name = "EREP", | |
127 | .minor_num = 0, | |
128 | .buffer_free = 1, | |
cb629a01 | 129 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), |
1da177e4 LT |
130 | .autorecording = 1, |
131 | .autopurge = 1, | |
132 | }, | |
133 | { .system_service = "*ACCOUNT", | |
134 | .internal_name = "account", | |
135 | .recording_name = "ACCOUNT", | |
136 | .minor_num = 1, | |
137 | .buffer_free = 1, | |
cb629a01 | 138 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), |
1da177e4 LT |
139 | .autorecording = 1, |
140 | .autopurge = 1, | |
141 | }, | |
142 | { .system_service = "*SYMPTOM", | |
143 | .internal_name = "symptom", | |
144 | .recording_name = "SYMPTOM", | |
145 | .minor_num = 2, | |
146 | .buffer_free = 1, | |
cb629a01 | 147 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), |
1da177e4 LT |
148 | .autorecording = 1, |
149 | .autopurge = 1, | |
150 | } | |
151 | }; | |
152 | ||
153 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
154 | ||
155 | static char FENCE[] = {"EOR"}; | |
156 | static int vmlogrdr_major = 0; | |
157 | static struct cdev *vmlogrdr_cdev = NULL; | |
158 | static int recording_class_AB; | |
159 | ||
160 | ||
c9101c5b | 161 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 162 | { |
c9101c5b MS |
163 | struct vmlogrdr_priv_t * logptr = path->private; |
164 | ||
1da177e4 LT |
165 | spin_lock(&logptr->priv_lock); |
166 | logptr->connection_established = 1; | |
167 | spin_unlock(&logptr->priv_lock); | |
168 | wake_up(&conn_wait_queue); | |
1da177e4 LT |
169 | } |
170 | ||
171 | ||
c9101c5b | 172 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 173 | { |
c9101c5b MS |
174 | struct vmlogrdr_priv_t * logptr = path->private; |
175 | u8 reason = (u8) ipuser[8]; | |
1da177e4 LT |
176 | |
177 | printk (KERN_ERR "vmlogrdr: connection severed with" | |
178 | " reason %i\n", reason); | |
179 | ||
c9101c5b MS |
180 | iucv_path_sever(path, NULL); |
181 | kfree(path); | |
182 | logptr->path = NULL; | |
183 | ||
1da177e4 LT |
184 | spin_lock(&logptr->priv_lock); |
185 | logptr->connection_established = 0; | |
186 | logptr->iucv_path_severed = 1; | |
187 | spin_unlock(&logptr->priv_lock); | |
188 | ||
189 | wake_up(&conn_wait_queue); | |
190 | /* just in case we're sleeping waiting for a record */ | |
191 | wake_up_interruptible(&read_wait_queue); | |
192 | } | |
193 | ||
194 | ||
c9101c5b MS |
195 | static void vmlogrdr_iucv_message_pending(struct iucv_path *path, |
196 | struct iucv_message *msg) | |
1da177e4 | 197 | { |
c9101c5b | 198 | struct vmlogrdr_priv_t * logptr = path->private; |
1da177e4 LT |
199 | |
200 | /* | |
201 | * This function is the bottom half so it should be quick. | |
202 | * Copy the external interrupt data into our local eib and increment | |
203 | * the usage count | |
204 | */ | |
205 | spin_lock(&logptr->priv_lock); | |
c9101c5b | 206 | memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); |
1da177e4 LT |
207 | atomic_inc(&logptr->receive_ready); |
208 | spin_unlock(&logptr->priv_lock); | |
209 | wake_up_interruptible(&read_wait_queue); | |
210 | } | |
211 | ||
212 | ||
c9101c5b MS |
213 | static int vmlogrdr_get_recording_class_AB(void) |
214 | { | |
1da177e4 LT |
215 | char cp_command[]="QUERY COMMAND RECORDING "; |
216 | char cp_response[80]; | |
217 | char *tail; | |
218 | int len,i; | |
219 | ||
6b979de3 | 220 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
221 | len = strnlen(cp_response,sizeof(cp_response)); |
222 | // now the parsing | |
223 | tail=strnchr(cp_response,len,'='); | |
224 | if (!tail) | |
225 | return 0; | |
226 | tail++; | |
227 | if (!strncmp("ANY",tail,3)) | |
228 | return 1; | |
229 | if (!strncmp("NONE",tail,4)) | |
230 | return 0; | |
231 | /* | |
232 | * expect comma separated list of classes here, if one of them | |
233 | * is A or B return 1 otherwise 0 | |
234 | */ | |
235 | for (i=tail-cp_response; i<len; i++) | |
236 | if ( cp_response[i]=='A' || cp_response[i]=='B' ) | |
237 | return 1; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | ||
c9101c5b MS |
242 | static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, |
243 | int action, int purge) | |
244 | { | |
1da177e4 LT |
245 | |
246 | char cp_command[80]; | |
247 | char cp_response[160]; | |
248 | char *onoff, *qid_string; | |
249 | ||
250 | memset(cp_command, 0x00, sizeof(cp_command)); | |
251 | memset(cp_response, 0x00, sizeof(cp_response)); | |
252 | ||
253 | onoff = ((action == 1) ? "ON" : "OFF"); | |
254 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); | |
255 | ||
256 | /* | |
257 | * The recording commands needs to be called with option QID | |
258 | * for guests that have previlege classes A or B. | |
259 | * Purging has to be done as separate step, because recording | |
260 | * can't be switched on as long as records are on the queue. | |
261 | * Doing both at the same time doesn't work. | |
262 | */ | |
263 | ||
264 | if (purge) { | |
265 | snprintf(cp_command, sizeof(cp_command), | |
266 | "RECORDING %s PURGE %s", | |
267 | logptr->recording_name, | |
268 | qid_string); | |
269 | ||
6b979de3 | 270 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
271 | } |
272 | ||
273 | memset(cp_command, 0x00, sizeof(cp_command)); | |
274 | memset(cp_response, 0x00, sizeof(cp_response)); | |
275 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
276 | logptr->recording_name, | |
277 | onoff, | |
278 | qid_string); | |
279 | ||
6b979de3 | 280 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
281 | /* The recording command will usually answer with 'Command complete' |
282 | * on success, but when the specific service was never connected | |
283 | * before then there might be an additional informational message | |
284 | * 'HCPCRC8072I Recording entry not found' before the | |
285 | * 'Command complete'. So I use strstr rather then the strncmp. | |
286 | */ | |
287 | if (strstr(cp_response,"Command complete")) | |
288 | return 0; | |
289 | else | |
290 | return -EIO; | |
291 | ||
292 | } | |
293 | ||
294 | ||
c9101c5b | 295 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
296 | { |
297 | int dev_num = 0; | |
298 | struct vmlogrdr_priv_t * logptr = NULL; | |
299 | int connect_rc = 0; | |
300 | int ret; | |
301 | ||
302 | dev_num = iminor(inode); | |
303 | if (dev_num > MAXMINOR) | |
304 | return -ENODEV; | |
1da177e4 | 305 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
306 | |
307 | /* | |
308 | * only allow for blocking reads to be open | |
309 | */ | |
310 | if (filp->f_flags & O_NONBLOCK) | |
311 | return -ENOSYS; | |
312 | ||
313 | /* Besure this device hasn't already been opened */ | |
764a4a8e | 314 | lock_kernel(); |
1da177e4 LT |
315 | spin_lock_bh(&logptr->priv_lock); |
316 | if (logptr->dev_in_use) { | |
317 | spin_unlock_bh(&logptr->priv_lock); | |
764a4a8e | 318 | unlock_kernel(); |
1da177e4 | 319 | return -EBUSY; |
1da177e4 | 320 | } |
c9101c5b MS |
321 | logptr->dev_in_use = 1; |
322 | logptr->connection_established = 0; | |
323 | logptr->iucv_path_severed = 0; | |
1da177e4 LT |
324 | atomic_set(&logptr->receive_ready, 0); |
325 | logptr->buffer_free = 1; | |
c9101c5b | 326 | spin_unlock_bh(&logptr->priv_lock); |
1da177e4 LT |
327 | |
328 | /* set the file options */ | |
329 | filp->private_data = logptr; | |
330 | filp->f_op = &vmlogrdr_fops; | |
331 | ||
332 | /* start recording for this service*/ | |
c9101c5b | 333 | if (logptr->autorecording) { |
1da177e4 | 334 | ret = vmlogrdr_recording(logptr,1,logptr->autopurge); |
c9101c5b MS |
335 | if (ret) |
336 | printk (KERN_WARNING "vmlogrdr: failed to start " | |
337 | "recording automatically\n"); | |
1da177e4 LT |
338 | } |
339 | ||
340 | /* create connection to the system service */ | |
c9101c5b MS |
341 | logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL); |
342 | if (!logptr->path) | |
343 | goto out_dev; | |
344 | connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler, | |
345 | logptr->system_service, NULL, NULL, | |
346 | logptr); | |
1da177e4 LT |
347 | if (connect_rc) { |
348 | printk (KERN_ERR "vmlogrdr: iucv connection to %s " | |
349 | "failed with rc %i \n", logptr->system_service, | |
350 | connect_rc); | |
c9101c5b | 351 | goto out_path; |
1da177e4 LT |
352 | } |
353 | ||
354 | /* We've issued the connect and now we must wait for a | |
355 | * ConnectionComplete or ConnectinSevered Interrupt | |
356 | * before we can continue to process. | |
357 | */ | |
358 | wait_event(conn_wait_queue, (logptr->connection_established) | |
359 | || (logptr->iucv_path_severed)); | |
c9101c5b MS |
360 | if (logptr->iucv_path_severed) |
361 | goto out_record; | |
764a4a8e JC |
362 | ret = nonseekable_open(inode, filp); |
363 | unlock_kernel(); | |
364 | return ret; | |
1da177e4 | 365 | |
c9101c5b | 366 | out_record: |
1da177e4 LT |
367 | if (logptr->autorecording) |
368 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
c9101c5b MS |
369 | out_path: |
370 | kfree(logptr->path); /* kfree(NULL) is ok. */ | |
371 | logptr->path = NULL; | |
372 | out_dev: | |
1da177e4 | 373 | logptr->dev_in_use = 0; |
764a4a8e | 374 | unlock_kernel(); |
1da177e4 | 375 | return -EIO; |
1da177e4 LT |
376 | } |
377 | ||
378 | ||
c9101c5b | 379 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
380 | { |
381 | int ret; | |
382 | ||
383 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
384 | ||
66b494a7 UB |
385 | iucv_path_sever(logptr->path, NULL); |
386 | kfree(logptr->path); | |
387 | logptr->path = NULL; | |
1da177e4 LT |
388 | if (logptr->autorecording) { |
389 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
390 | if (ret) | |
391 | printk (KERN_WARNING "vmlogrdr: failed to stop " | |
392 | "recording automatically\n"); | |
393 | } | |
394 | logptr->dev_in_use = 0; | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | ||
c9101c5b MS |
400 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
401 | { | |
1da177e4 LT |
402 | int rc, *temp; |
403 | /* we need to keep track of two data sizes here: | |
404 | * The number of bytes we need to receive from iucv and | |
405 | * the total number of bytes we actually write into the buffer. | |
406 | */ | |
407 | int user_data_count, iucv_data_count; | |
408 | char * buffer; | |
409 | ||
410 | if (atomic_read(&priv->receive_ready)) { | |
411 | spin_lock_bh(&priv->priv_lock); | |
412 | if (priv->residual_length){ | |
413 | /* receive second half of a record */ | |
414 | iucv_data_count = priv->residual_length; | |
415 | user_data_count = 0; | |
416 | buffer = priv->buffer; | |
417 | } else { | |
418 | /* receive a new record: | |
419 | * We need to return the total length of the record | |
420 | * + size of FENCE in the first 4 bytes of the buffer. | |
421 | */ | |
c9101c5b | 422 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
423 | user_data_count = sizeof(int); |
424 | temp = (int*)priv->buffer; | |
425 | *temp= iucv_data_count + sizeof(FENCE); | |
426 | buffer = priv->buffer + sizeof(int); | |
427 | } | |
428 | /* | |
429 | * If the record is bigger then our buffer, we receive only | |
430 | * a part of it. We can get the rest later. | |
431 | */ | |
432 | if (iucv_data_count > NET_BUFFER_SIZE) | |
433 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
434 | rc = iucv_message_receive(priv->path, |
435 | &priv->local_interrupt_buffer, | |
436 | 0, buffer, iucv_data_count, | |
437 | &priv->residual_length); | |
1da177e4 LT |
438 | spin_unlock_bh(&priv->priv_lock); |
439 | /* An rc of 5 indicates that the record was bigger then | |
440 | * the buffer, which is OK for us. A 9 indicates that the | |
441 | * record was purged befor we could receive it. | |
442 | */ | |
443 | if (rc == 5) | |
444 | rc = 0; | |
445 | if (rc == 9) | |
446 | atomic_set(&priv->receive_ready, 0); | |
447 | } else { | |
448 | rc = 1; | |
449 | } | |
450 | if (!rc) { | |
451 | priv->buffer_free = 0; | |
452 | user_data_count += iucv_data_count; | |
453 | priv->current_position = priv->buffer; | |
454 | if (priv->residual_length == 0){ | |
455 | /* the whole record has been captured, | |
456 | * now add the fence */ | |
457 | atomic_dec(&priv->receive_ready); | |
458 | buffer = priv->buffer + user_data_count; | |
459 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
460 | user_data_count += sizeof(FENCE); | |
461 | } | |
462 | priv->remaining = user_data_count; | |
463 | } | |
464 | ||
465 | return rc; | |
466 | } | |
467 | ||
468 | ||
c9101c5b MS |
469 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
470 | size_t count, loff_t * ppos) | |
1da177e4 LT |
471 | { |
472 | int rc; | |
473 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
474 | ||
475 | while (priv->buffer_free) { | |
476 | rc = vmlogrdr_receive_data(priv); | |
477 | if (rc) { | |
478 | rc = wait_event_interruptible(read_wait_queue, | |
479 | atomic_read(&priv->receive_ready)); | |
480 | if (rc) | |
481 | return rc; | |
482 | } | |
483 | } | |
484 | /* copy only up to end of record */ | |
485 | if (count > priv->remaining) | |
486 | count = priv->remaining; | |
487 | ||
488 | if (copy_to_user(data, priv->current_position, count)) | |
489 | return -EFAULT; | |
490 | ||
491 | *ppos += count; | |
492 | priv->current_position += count; | |
493 | priv->remaining -= count; | |
494 | ||
495 | /* if all data has been transferred, set buffer free */ | |
496 | if (priv->remaining == 0) | |
497 | priv->buffer_free = 1; | |
498 | ||
499 | return count; | |
500 | } | |
501 | ||
c9101c5b MS |
502 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
503 | struct device_attribute *attr, | |
504 | const char * buf, size_t count) | |
505 | { | |
1da177e4 LT |
506 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
507 | ssize_t ret = count; | |
508 | ||
509 | switch (buf[0]) { | |
510 | case '0': | |
511 | priv->autopurge=0; | |
512 | break; | |
513 | case '1': | |
514 | priv->autopurge=1; | |
515 | break; | |
516 | default: | |
517 | ret = -EINVAL; | |
518 | } | |
519 | return ret; | |
520 | } | |
521 | ||
522 | ||
c9101c5b MS |
523 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
524 | struct device_attribute *attr, | |
525 | char *buf) | |
526 | { | |
1da177e4 LT |
527 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
528 | return sprintf(buf, "%u\n", priv->autopurge); | |
529 | } | |
530 | ||
531 | ||
532 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
533 | vmlogrdr_autopurge_store); | |
534 | ||
535 | ||
c9101c5b MS |
536 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
537 | struct device_attribute *attr, | |
538 | const char * buf, size_t count) | |
539 | { | |
1da177e4 LT |
540 | |
541 | char cp_command[80]; | |
542 | char cp_response[80]; | |
543 | struct vmlogrdr_priv_t *priv = dev->driver_data; | |
544 | ||
545 | if (buf[0] != '1') | |
546 | return -EINVAL; | |
547 | ||
548 | memset(cp_command, 0x00, sizeof(cp_command)); | |
549 | memset(cp_response, 0x00, sizeof(cp_response)); | |
550 | ||
551 | /* | |
552 | * The recording command needs to be called with option QID | |
553 | * for guests that have previlege classes A or B. | |
554 | * Other guests will not recognize the command and we have to | |
555 | * issue the same command without the QID parameter. | |
556 | */ | |
557 | ||
558 | if (recording_class_AB) | |
559 | snprintf(cp_command, sizeof(cp_command), | |
560 | "RECORDING %s PURGE QID * ", | |
561 | priv->recording_name); | |
562 | else | |
563 | snprintf(cp_command, sizeof(cp_command), | |
564 | "RECORDING %s PURGE ", | |
565 | priv->recording_name); | |
566 | ||
6b979de3 | 567 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
568 | |
569 | return count; | |
570 | } | |
571 | ||
572 | ||
573 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
574 | ||
575 | ||
c9101c5b MS |
576 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
577 | struct device_attribute *attr, | |
578 | const char *buf, size_t count) | |
579 | { | |
1da177e4 LT |
580 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
581 | ssize_t ret = count; | |
582 | ||
583 | switch (buf[0]) { | |
584 | case '0': | |
585 | priv->autorecording=0; | |
586 | break; | |
587 | case '1': | |
588 | priv->autorecording=1; | |
589 | break; | |
590 | default: | |
591 | ret = -EINVAL; | |
592 | } | |
593 | return ret; | |
594 | } | |
595 | ||
596 | ||
c9101c5b MS |
597 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
598 | struct device_attribute *attr, | |
599 | char *buf) | |
600 | { | |
1da177e4 LT |
601 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
602 | return sprintf(buf, "%u\n", priv->autorecording); | |
603 | } | |
604 | ||
605 | ||
606 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
607 | vmlogrdr_autorecording_store); | |
608 | ||
609 | ||
c9101c5b MS |
610 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
611 | struct device_attribute *attr, | |
612 | const char * buf, size_t count) | |
613 | { | |
1da177e4 LT |
614 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
615 | ssize_t ret; | |
616 | ||
617 | switch (buf[0]) { | |
618 | case '0': | |
619 | ret = vmlogrdr_recording(priv,0,0); | |
620 | break; | |
621 | case '1': | |
622 | ret = vmlogrdr_recording(priv,1,0); | |
623 | break; | |
624 | default: | |
625 | ret = -EINVAL; | |
626 | } | |
627 | if (ret) | |
628 | return ret; | |
629 | else | |
630 | return count; | |
631 | ||
632 | } | |
633 | ||
634 | ||
635 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
636 | ||
637 | ||
c9101c5b MS |
638 | static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver, |
639 | char *buf) | |
640 | { | |
1da177e4 LT |
641 | |
642 | char cp_command[] = "QUERY RECORDING "; | |
643 | int len; | |
644 | ||
6b979de3 | 645 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
646 | len = strlen(buf); |
647 | return len; | |
648 | } | |
649 | ||
650 | ||
651 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, | |
652 | NULL); | |
653 | ||
654 | static struct attribute *vmlogrdr_attrs[] = { | |
655 | &dev_attr_autopurge.attr, | |
656 | &dev_attr_purge.attr, | |
657 | &dev_attr_autorecording.attr, | |
658 | &dev_attr_recording.attr, | |
659 | NULL, | |
660 | }; | |
661 | ||
662 | static struct attribute_group vmlogrdr_attr_group = { | |
663 | .attrs = vmlogrdr_attrs, | |
664 | }; | |
665 | ||
56b22935 | 666 | static struct class *vmlogrdr_class; |
1da177e4 LT |
667 | static struct device_driver vmlogrdr_driver = { |
668 | .name = "vmlogrdr", | |
669 | .bus = &iucv_bus, | |
670 | }; | |
671 | ||
672 | ||
c9101c5b MS |
673 | static int vmlogrdr_register_driver(void) |
674 | { | |
1da177e4 LT |
675 | int ret; |
676 | ||
c9101c5b MS |
677 | /* Register with iucv driver */ |
678 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
2f6f2521 | 679 | if (ret) |
c9101c5b | 680 | goto out; |
c9101c5b | 681 | |
1da177e4 | 682 | ret = driver_register(&vmlogrdr_driver); |
2f6f2521 | 683 | if (ret) |
c9101c5b | 684 | goto out_iucv; |
1da177e4 LT |
685 | |
686 | ret = driver_create_file(&vmlogrdr_driver, | |
687 | &driver_attr_recording_status); | |
2f6f2521 | 688 | if (ret) |
c9101c5b | 689 | goto out_driver; |
1da177e4 | 690 | |
56b22935 | 691 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 | 692 | if (IS_ERR(vmlogrdr_class)) { |
c9101c5b MS |
693 | ret = PTR_ERR(vmlogrdr_class); |
694 | vmlogrdr_class = NULL; | |
695 | goto out_attr; | |
1da177e4 LT |
696 | } |
697 | return 0; | |
698 | ||
c9101c5b | 699 | out_attr: |
1da177e4 | 700 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); |
c9101c5b | 701 | out_driver: |
1da177e4 | 702 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
703 | out_iucv: |
704 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
705 | out: | |
1da177e4 LT |
706 | return ret; |
707 | } | |
708 | ||
709 | ||
c9101c5b MS |
710 | static void vmlogrdr_unregister_driver(void) |
711 | { | |
56b22935 | 712 | class_destroy(vmlogrdr_class); |
1da177e4 LT |
713 | vmlogrdr_class = NULL; |
714 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
715 | driver_unregister(&vmlogrdr_driver); | |
c9101c5b | 716 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
717 | } |
718 | ||
719 | ||
c9101c5b MS |
720 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
721 | { | |
1da177e4 LT |
722 | struct device *dev; |
723 | int ret; | |
724 | ||
88abaab4 | 725 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 726 | if (dev) { |
1bf5b285 | 727 | dev_set_name(dev, priv->internal_name); |
1da177e4 LT |
728 | dev->bus = &iucv_bus; |
729 | dev->parent = iucv_root; | |
730 | dev->driver = &vmlogrdr_driver; | |
731 | /* | |
732 | * The release function could be called after the | |
733 | * module has been unloaded. It's _only_ task is to | |
734 | * free the struct. Therefore, we specify kfree() | |
735 | * directly here. (Probably a little bit obfuscating | |
736 | * but legitime ...). | |
737 | */ | |
738 | dev->release = (void (*)(struct device *))kfree; | |
739 | } else | |
740 | return -ENOMEM; | |
741 | ret = device_register(dev); | |
742 | if (ret) | |
743 | return ret; | |
744 | ||
745 | ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group); | |
746 | if (ret) { | |
747 | device_unregister(dev); | |
748 | return ret; | |
749 | } | |
ea9e42f6 GKH |
750 | priv->class_device = device_create(vmlogrdr_class, dev, |
751 | MKDEV(vmlogrdr_major, | |
752 | priv->minor_num), | |
753 | priv, "%s", dev_name(dev)); | |
1da177e4 LT |
754 | if (IS_ERR(priv->class_device)) { |
755 | ret = PTR_ERR(priv->class_device); | |
756 | priv->class_device=NULL; | |
757 | sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group); | |
758 | device_unregister(dev); | |
759 | return ret; | |
760 | } | |
1da177e4 LT |
761 | priv->device = dev; |
762 | return 0; | |
763 | } | |
764 | ||
765 | ||
c9101c5b MS |
766 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
767 | { | |
7f021ce1 | 768 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 LT |
769 | if (priv->device != NULL) { |
770 | sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group); | |
771 | device_unregister(priv->device); | |
772 | priv->device=NULL; | |
773 | } | |
774 | return 0; | |
775 | } | |
776 | ||
777 | ||
c9101c5b MS |
778 | static int vmlogrdr_register_cdev(dev_t dev) |
779 | { | |
1da177e4 LT |
780 | int rc = 0; |
781 | vmlogrdr_cdev = cdev_alloc(); | |
782 | if (!vmlogrdr_cdev) { | |
783 | return -ENOMEM; | |
784 | } | |
785 | vmlogrdr_cdev->owner = THIS_MODULE; | |
786 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
787 | vmlogrdr_cdev->dev = dev; | |
788 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
789 | if (!rc) | |
790 | return 0; | |
791 | ||
792 | // cleanup: cdev is not fully registered, no cdev_del here! | |
793 | kobject_put(&vmlogrdr_cdev->kobj); | |
794 | vmlogrdr_cdev=NULL; | |
795 | return rc; | |
796 | } | |
797 | ||
798 | ||
c9101c5b MS |
799 | static void vmlogrdr_cleanup(void) |
800 | { | |
1da177e4 | 801 | int i; |
c9101c5b | 802 | |
1da177e4 LT |
803 | if (vmlogrdr_cdev) { |
804 | cdev_del(vmlogrdr_cdev); | |
805 | vmlogrdr_cdev=NULL; | |
806 | } | |
807 | for (i=0; i < MAXMINOR; ++i ) { | |
808 | vmlogrdr_unregister_device(&sys_ser[i]); | |
809 | free_page((unsigned long)sys_ser[i].buffer); | |
810 | } | |
811 | vmlogrdr_unregister_driver(); | |
812 | if (vmlogrdr_major) { | |
813 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
814 | vmlogrdr_major=0; | |
815 | } | |
816 | } | |
817 | ||
818 | ||
f60d8910 | 819 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
820 | { |
821 | int rc; | |
822 | int i; | |
823 | dev_t dev; | |
824 | ||
825 | if (! MACHINE_IS_VM) { | |
826 | printk (KERN_ERR "vmlogrdr: not running under VM, " | |
827 | "driver not loaded.\n"); | |
828 | return -ENODEV; | |
829 | } | |
830 | ||
831 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
832 | ||
833 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
834 | if (rc) | |
835 | return rc; | |
836 | vmlogrdr_major = MAJOR(dev); | |
837 | ||
838 | rc=vmlogrdr_register_driver(); | |
839 | if (rc) | |
840 | goto cleanup; | |
841 | ||
842 | for (i=0; i < MAXMINOR; ++i ) { | |
843 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
844 | if (!sys_ser[i].buffer) { | |
3cb2cea1 | 845 | rc = -ENOMEM; |
1da177e4 LT |
846 | break; |
847 | } | |
848 | sys_ser[i].current_position = sys_ser[i].buffer; | |
849 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
850 | if (rc) | |
851 | break; | |
852 | } | |
853 | if (rc) | |
854 | goto cleanup; | |
855 | ||
856 | rc = vmlogrdr_register_cdev(dev); | |
857 | if (rc) | |
858 | goto cleanup; | |
1da177e4 LT |
859 | return 0; |
860 | ||
861 | cleanup: | |
862 | vmlogrdr_cleanup(); | |
1da177e4 LT |
863 | return rc; |
864 | } | |
865 | ||
866 | ||
f60d8910 | 867 | static void __exit vmlogrdr_exit(void) |
1da177e4 LT |
868 | { |
869 | vmlogrdr_cleanup(); | |
1da177e4 LT |
870 | return; |
871 | } | |
872 | ||
873 | ||
874 | module_init(vmlogrdr_init); | |
875 | module_exit(vmlogrdr_exit); |