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Commit | Line | Data |
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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 | */ | |
5466c2e4 MS |
13 | |
14 | #define KMSG_COMPONENT "vmlogrdr" | |
15 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <asm/atomic.h> | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/cpcmd.h> | |
26 | #include <asm/debug.h> | |
27 | #include <asm/ebcdic.h> | |
c9101c5b | 28 | #include <net/iucv/iucv.h> |
1da177e4 LT |
29 | #include <linux/kmod.h> |
30 | #include <linux/cdev.h> | |
31 | #include <linux/device.h> | |
764a4a8e | 32 | #include <linux/smp_lock.h> |
1da177e4 LT |
33 | #include <linux/string.h> |
34 | ||
1da177e4 LT |
35 | MODULE_AUTHOR |
36 | ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n" | |
37 | " Stefan Weinhuber (wein@de.ibm.com)"); | |
38 | MODULE_DESCRIPTION ("Character device driver for reading z/VM " | |
39 | "system service records."); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
42 | ||
43 | /* | |
44 | * The size of the buffer for iucv data transfer is one page, | |
45 | * but in addition to the data we read from iucv we also | |
46 | * place an integer and some characters into that buffer, | |
47 | * so the maximum size for record data is a little less then | |
48 | * one page. | |
49 | */ | |
50 | #define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE)) | |
51 | ||
52 | /* | |
53 | * The elements that are concurrently accessed by bottom halves are | |
54 | * connection_established, iucv_path_severed, local_interrupt_buffer | |
55 | * and receive_ready. The first three can be protected by | |
56 | * priv_lock. receive_ready is atomic, so it can be incremented and | |
57 | * decremented without holding a lock. | |
58 | * The variable dev_in_use needs to be protected by the lock, since | |
59 | * it's a flag used by open to make sure that the device is opened only | |
60 | * by one user at the same time. | |
61 | */ | |
62 | struct vmlogrdr_priv_t { | |
63 | char system_service[8]; | |
64 | char internal_name[8]; | |
65 | char recording_name[8]; | |
c9101c5b | 66 | struct iucv_path *path; |
1da177e4 LT |
67 | int connection_established; |
68 | int iucv_path_severed; | |
c9101c5b | 69 | struct iucv_message local_interrupt_buffer; |
1da177e4 | 70 | atomic_t receive_ready; |
1da177e4 LT |
71 | int minor_num; |
72 | char * buffer; | |
73 | char * current_position; | |
74 | int remaining; | |
75 | ulong residual_length; | |
76 | int buffer_free; | |
77 | int dev_in_use; /* 1: already opened, 0: not opened*/ | |
78 | spinlock_t priv_lock; | |
79 | struct device *device; | |
7f021ce1 | 80 | struct device *class_device; |
1da177e4 LT |
81 | int autorecording; |
82 | int autopurge; | |
83 | }; | |
84 | ||
85 | ||
86 | /* | |
87 | * File operation structure for vmlogrdr devices | |
88 | */ | |
89 | static int vmlogrdr_open(struct inode *, struct file *); | |
90 | static int vmlogrdr_release(struct inode *, struct file *); | |
d2c993d8 HC |
91 | static ssize_t vmlogrdr_read (struct file *filp, char __user *data, |
92 | size_t count, loff_t * ppos); | |
1da177e4 | 93 | |
d54b1fdb | 94 | static const struct file_operations vmlogrdr_fops = { |
1da177e4 LT |
95 | .owner = THIS_MODULE, |
96 | .open = vmlogrdr_open, | |
97 | .release = vmlogrdr_release, | |
98 | .read = vmlogrdr_read, | |
99 | }; | |
100 | ||
101 | ||
c9101c5b MS |
102 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]); |
103 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]); | |
104 | static void vmlogrdr_iucv_message_pending(struct iucv_path *, | |
105 | struct iucv_message *); | |
1da177e4 LT |
106 | |
107 | ||
c9101c5b MS |
108 | static struct iucv_handler vmlogrdr_iucv_handler = { |
109 | .path_complete = vmlogrdr_iucv_path_complete, | |
110 | .path_severed = vmlogrdr_iucv_path_severed, | |
111 | .message_pending = vmlogrdr_iucv_message_pending, | |
1da177e4 LT |
112 | }; |
113 | ||
114 | ||
2b67fc46 HC |
115 | static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); |
116 | static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
1da177e4 LT |
117 | |
118 | /* | |
119 | * pointer to system service private structure | |
120 | * minor number 0 --> logrec | |
121 | * minor number 1 --> account | |
122 | * minor number 2 --> symptom | |
123 | */ | |
124 | ||
125 | static struct vmlogrdr_priv_t sys_ser[] = { | |
126 | { .system_service = "*LOGREC ", | |
127 | .internal_name = "logrec", | |
128 | .recording_name = "EREP", | |
129 | .minor_num = 0, | |
130 | .buffer_free = 1, | |
cb629a01 | 131 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), |
1da177e4 LT |
132 | .autorecording = 1, |
133 | .autopurge = 1, | |
134 | }, | |
135 | { .system_service = "*ACCOUNT", | |
136 | .internal_name = "account", | |
137 | .recording_name = "ACCOUNT", | |
138 | .minor_num = 1, | |
139 | .buffer_free = 1, | |
cb629a01 | 140 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), |
1da177e4 LT |
141 | .autorecording = 1, |
142 | .autopurge = 1, | |
143 | }, | |
144 | { .system_service = "*SYMPTOM", | |
145 | .internal_name = "symptom", | |
146 | .recording_name = "SYMPTOM", | |
147 | .minor_num = 2, | |
148 | .buffer_free = 1, | |
cb629a01 | 149 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), |
1da177e4 LT |
150 | .autorecording = 1, |
151 | .autopurge = 1, | |
152 | } | |
153 | }; | |
154 | ||
155 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
156 | ||
157 | static char FENCE[] = {"EOR"}; | |
158 | static int vmlogrdr_major = 0; | |
159 | static struct cdev *vmlogrdr_cdev = NULL; | |
160 | static int recording_class_AB; | |
161 | ||
162 | ||
c9101c5b | 163 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 164 | { |
c9101c5b MS |
165 | struct vmlogrdr_priv_t * logptr = path->private; |
166 | ||
1da177e4 LT |
167 | spin_lock(&logptr->priv_lock); |
168 | logptr->connection_established = 1; | |
169 | spin_unlock(&logptr->priv_lock); | |
170 | wake_up(&conn_wait_queue); | |
1da177e4 LT |
171 | } |
172 | ||
173 | ||
c9101c5b | 174 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 175 | { |
c9101c5b MS |
176 | struct vmlogrdr_priv_t * logptr = path->private; |
177 | u8 reason = (u8) ipuser[8]; | |
1da177e4 | 178 | |
5466c2e4 | 179 | pr_err("vmlogrdr: connection severed with reason %i\n", reason); |
1da177e4 | 180 | |
c9101c5b MS |
181 | iucv_path_sever(path, NULL); |
182 | kfree(path); | |
183 | logptr->path = NULL; | |
184 | ||
1da177e4 LT |
185 | spin_lock(&logptr->priv_lock); |
186 | logptr->connection_established = 0; | |
187 | logptr->iucv_path_severed = 1; | |
188 | spin_unlock(&logptr->priv_lock); | |
189 | ||
190 | wake_up(&conn_wait_queue); | |
191 | /* just in case we're sleeping waiting for a record */ | |
192 | wake_up_interruptible(&read_wait_queue); | |
193 | } | |
194 | ||
195 | ||
c9101c5b MS |
196 | static void vmlogrdr_iucv_message_pending(struct iucv_path *path, |
197 | struct iucv_message *msg) | |
1da177e4 | 198 | { |
c9101c5b | 199 | struct vmlogrdr_priv_t * logptr = path->private; |
1da177e4 LT |
200 | |
201 | /* | |
202 | * This function is the bottom half so it should be quick. | |
203 | * Copy the external interrupt data into our local eib and increment | |
204 | * the usage count | |
205 | */ | |
206 | spin_lock(&logptr->priv_lock); | |
c9101c5b | 207 | memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); |
1da177e4 LT |
208 | atomic_inc(&logptr->receive_ready); |
209 | spin_unlock(&logptr->priv_lock); | |
210 | wake_up_interruptible(&read_wait_queue); | |
211 | } | |
212 | ||
213 | ||
c9101c5b MS |
214 | static int vmlogrdr_get_recording_class_AB(void) |
215 | { | |
1da177e4 LT |
216 | char cp_command[]="QUERY COMMAND RECORDING "; |
217 | char cp_response[80]; | |
218 | char *tail; | |
219 | int len,i; | |
220 | ||
6b979de3 | 221 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
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 | ||
6b979de3 | 271 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
272 | } |
273 | ||
274 | memset(cp_command, 0x00, sizeof(cp_command)); | |
275 | memset(cp_response, 0x00, sizeof(cp_response)); | |
276 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
277 | logptr->recording_name, | |
278 | onoff, | |
279 | qid_string); | |
280 | ||
6b979de3 | 281 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
282 | /* The recording command will usually answer with 'Command complete' |
283 | * on success, but when the specific service was never connected | |
284 | * before then there might be an additional informational message | |
285 | * 'HCPCRC8072I Recording entry not found' before the | |
286 | * 'Command complete'. So I use strstr rather then the strncmp. | |
287 | */ | |
288 | if (strstr(cp_response,"Command complete")) | |
289 | return 0; | |
290 | else | |
291 | return -EIO; | |
292 | ||
293 | } | |
294 | ||
295 | ||
c9101c5b | 296 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
297 | { |
298 | int dev_num = 0; | |
299 | struct vmlogrdr_priv_t * logptr = NULL; | |
300 | int connect_rc = 0; | |
301 | int ret; | |
302 | ||
303 | dev_num = iminor(inode); | |
304 | if (dev_num > MAXMINOR) | |
305 | return -ENODEV; | |
1da177e4 | 306 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
307 | |
308 | /* | |
309 | * only allow for blocking reads to be open | |
310 | */ | |
311 | if (filp->f_flags & O_NONBLOCK) | |
312 | return -ENOSYS; | |
313 | ||
314 | /* Besure this device hasn't already been opened */ | |
764a4a8e | 315 | lock_kernel(); |
1da177e4 LT |
316 | spin_lock_bh(&logptr->priv_lock); |
317 | if (logptr->dev_in_use) { | |
318 | spin_unlock_bh(&logptr->priv_lock); | |
764a4a8e | 319 | unlock_kernel(); |
1da177e4 | 320 | return -EBUSY; |
1da177e4 | 321 | } |
c9101c5b MS |
322 | logptr->dev_in_use = 1; |
323 | logptr->connection_established = 0; | |
324 | logptr->iucv_path_severed = 0; | |
1da177e4 LT |
325 | atomic_set(&logptr->receive_ready, 0); |
326 | logptr->buffer_free = 1; | |
c9101c5b | 327 | spin_unlock_bh(&logptr->priv_lock); |
1da177e4 LT |
328 | |
329 | /* set the file options */ | |
330 | filp->private_data = logptr; | |
331 | filp->f_op = &vmlogrdr_fops; | |
332 | ||
333 | /* start recording for this service*/ | |
c9101c5b | 334 | if (logptr->autorecording) { |
1da177e4 | 335 | ret = vmlogrdr_recording(logptr,1,logptr->autopurge); |
c9101c5b | 336 | if (ret) |
5466c2e4 MS |
337 | pr_warning("vmlogrdr: failed to start " |
338 | "recording automatically\n"); | |
1da177e4 LT |
339 | } |
340 | ||
341 | /* create connection to the system service */ | |
c9101c5b MS |
342 | logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL); |
343 | if (!logptr->path) | |
344 | goto out_dev; | |
345 | connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler, | |
346 | logptr->system_service, NULL, NULL, | |
347 | logptr); | |
1da177e4 | 348 | if (connect_rc) { |
5466c2e4 MS |
349 | pr_err("vmlogrdr: iucv connection to %s " |
350 | "failed with rc %i \n", | |
351 | logptr->system_service, connect_rc); | |
c9101c5b | 352 | goto out_path; |
1da177e4 LT |
353 | } |
354 | ||
355 | /* We've issued the connect and now we must wait for a | |
356 | * ConnectionComplete or ConnectinSevered Interrupt | |
357 | * before we can continue to process. | |
358 | */ | |
359 | wait_event(conn_wait_queue, (logptr->connection_established) | |
360 | || (logptr->iucv_path_severed)); | |
c9101c5b MS |
361 | if (logptr->iucv_path_severed) |
362 | goto out_record; | |
764a4a8e JC |
363 | ret = nonseekable_open(inode, filp); |
364 | unlock_kernel(); | |
365 | return ret; | |
1da177e4 | 366 | |
c9101c5b | 367 | out_record: |
1da177e4 LT |
368 | if (logptr->autorecording) |
369 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
c9101c5b MS |
370 | out_path: |
371 | kfree(logptr->path); /* kfree(NULL) is ok. */ | |
372 | logptr->path = NULL; | |
373 | out_dev: | |
1da177e4 | 374 | logptr->dev_in_use = 0; |
764a4a8e | 375 | unlock_kernel(); |
1da177e4 | 376 | return -EIO; |
1da177e4 LT |
377 | } |
378 | ||
379 | ||
c9101c5b | 380 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
381 | { |
382 | int ret; | |
383 | ||
384 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
385 | ||
66b494a7 UB |
386 | iucv_path_sever(logptr->path, NULL); |
387 | kfree(logptr->path); | |
388 | logptr->path = NULL; | |
1da177e4 LT |
389 | if (logptr->autorecording) { |
390 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
391 | if (ret) | |
5466c2e4 MS |
392 | pr_warning("vmlogrdr: failed to stop " |
393 | "recording automatically\n"); | |
1da177e4 LT |
394 | } |
395 | logptr->dev_in_use = 0; | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | ||
c9101c5b MS |
401 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
402 | { | |
1da177e4 LT |
403 | int rc, *temp; |
404 | /* we need to keep track of two data sizes here: | |
405 | * The number of bytes we need to receive from iucv and | |
406 | * the total number of bytes we actually write into the buffer. | |
407 | */ | |
408 | int user_data_count, iucv_data_count; | |
409 | char * buffer; | |
410 | ||
411 | if (atomic_read(&priv->receive_ready)) { | |
412 | spin_lock_bh(&priv->priv_lock); | |
413 | if (priv->residual_length){ | |
414 | /* receive second half of a record */ | |
415 | iucv_data_count = priv->residual_length; | |
416 | user_data_count = 0; | |
417 | buffer = priv->buffer; | |
418 | } else { | |
419 | /* receive a new record: | |
420 | * We need to return the total length of the record | |
421 | * + size of FENCE in the first 4 bytes of the buffer. | |
422 | */ | |
c9101c5b | 423 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
424 | user_data_count = sizeof(int); |
425 | temp = (int*)priv->buffer; | |
426 | *temp= iucv_data_count + sizeof(FENCE); | |
427 | buffer = priv->buffer + sizeof(int); | |
428 | } | |
429 | /* | |
025dfdaf | 430 | * If the record is bigger than our buffer, we receive only |
1da177e4 LT |
431 | * a part of it. We can get the rest later. |
432 | */ | |
433 | if (iucv_data_count > NET_BUFFER_SIZE) | |
434 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
435 | rc = iucv_message_receive(priv->path, |
436 | &priv->local_interrupt_buffer, | |
437 | 0, buffer, iucv_data_count, | |
438 | &priv->residual_length); | |
1da177e4 | 439 | spin_unlock_bh(&priv->priv_lock); |
025dfdaf | 440 | /* An rc of 5 indicates that the record was bigger than |
1da177e4 LT |
441 | * the buffer, which is OK for us. A 9 indicates that the |
442 | * record was purged befor we could receive it. | |
443 | */ | |
444 | if (rc == 5) | |
445 | rc = 0; | |
446 | if (rc == 9) | |
447 | atomic_set(&priv->receive_ready, 0); | |
448 | } else { | |
449 | rc = 1; | |
450 | } | |
451 | if (!rc) { | |
452 | priv->buffer_free = 0; | |
453 | user_data_count += iucv_data_count; | |
454 | priv->current_position = priv->buffer; | |
455 | if (priv->residual_length == 0){ | |
456 | /* the whole record has been captured, | |
457 | * now add the fence */ | |
458 | atomic_dec(&priv->receive_ready); | |
459 | buffer = priv->buffer + user_data_count; | |
460 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
461 | user_data_count += sizeof(FENCE); | |
462 | } | |
463 | priv->remaining = user_data_count; | |
464 | } | |
465 | ||
466 | return rc; | |
467 | } | |
468 | ||
469 | ||
c9101c5b MS |
470 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
471 | size_t count, loff_t * ppos) | |
1da177e4 LT |
472 | { |
473 | int rc; | |
474 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
475 | ||
476 | while (priv->buffer_free) { | |
477 | rc = vmlogrdr_receive_data(priv); | |
478 | if (rc) { | |
479 | rc = wait_event_interruptible(read_wait_queue, | |
480 | atomic_read(&priv->receive_ready)); | |
481 | if (rc) | |
482 | return rc; | |
483 | } | |
484 | } | |
485 | /* copy only up to end of record */ | |
486 | if (count > priv->remaining) | |
487 | count = priv->remaining; | |
488 | ||
489 | if (copy_to_user(data, priv->current_position, count)) | |
490 | return -EFAULT; | |
491 | ||
492 | *ppos += count; | |
493 | priv->current_position += count; | |
494 | priv->remaining -= count; | |
495 | ||
496 | /* if all data has been transferred, set buffer free */ | |
497 | if (priv->remaining == 0) | |
498 | priv->buffer_free = 1; | |
499 | ||
500 | return count; | |
501 | } | |
502 | ||
c9101c5b MS |
503 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
504 | struct device_attribute *attr, | |
505 | const char * buf, size_t count) | |
506 | { | |
1da177e4 LT |
507 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
508 | ssize_t ret = count; | |
509 | ||
510 | switch (buf[0]) { | |
511 | case '0': | |
512 | priv->autopurge=0; | |
513 | break; | |
514 | case '1': | |
515 | priv->autopurge=1; | |
516 | break; | |
517 | default: | |
518 | ret = -EINVAL; | |
519 | } | |
520 | return ret; | |
521 | } | |
522 | ||
523 | ||
c9101c5b MS |
524 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
525 | struct device_attribute *attr, | |
526 | char *buf) | |
527 | { | |
1da177e4 LT |
528 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
529 | return sprintf(buf, "%u\n", priv->autopurge); | |
530 | } | |
531 | ||
532 | ||
533 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
534 | vmlogrdr_autopurge_store); | |
535 | ||
536 | ||
c9101c5b MS |
537 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
538 | struct device_attribute *attr, | |
539 | const char * buf, size_t count) | |
540 | { | |
1da177e4 LT |
541 | |
542 | char cp_command[80]; | |
543 | char cp_response[80]; | |
544 | struct vmlogrdr_priv_t *priv = dev->driver_data; | |
545 | ||
546 | if (buf[0] != '1') | |
547 | return -EINVAL; | |
548 | ||
549 | memset(cp_command, 0x00, sizeof(cp_command)); | |
550 | memset(cp_response, 0x00, sizeof(cp_response)); | |
551 | ||
552 | /* | |
553 | * The recording command needs to be called with option QID | |
554 | * for guests that have previlege classes A or B. | |
555 | * Other guests will not recognize the command and we have to | |
556 | * issue the same command without the QID parameter. | |
557 | */ | |
558 | ||
559 | if (recording_class_AB) | |
560 | snprintf(cp_command, sizeof(cp_command), | |
561 | "RECORDING %s PURGE QID * ", | |
562 | priv->recording_name); | |
563 | else | |
564 | snprintf(cp_command, sizeof(cp_command), | |
565 | "RECORDING %s PURGE ", | |
566 | priv->recording_name); | |
567 | ||
6b979de3 | 568 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
569 | |
570 | return count; | |
571 | } | |
572 | ||
573 | ||
574 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
575 | ||
576 | ||
c9101c5b MS |
577 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
578 | struct device_attribute *attr, | |
579 | const char *buf, size_t count) | |
580 | { | |
1da177e4 LT |
581 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
582 | ssize_t ret = count; | |
583 | ||
584 | switch (buf[0]) { | |
585 | case '0': | |
586 | priv->autorecording=0; | |
587 | break; | |
588 | case '1': | |
589 | priv->autorecording=1; | |
590 | break; | |
591 | default: | |
592 | ret = -EINVAL; | |
593 | } | |
594 | return ret; | |
595 | } | |
596 | ||
597 | ||
c9101c5b MS |
598 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
599 | struct device_attribute *attr, | |
600 | char *buf) | |
601 | { | |
1da177e4 LT |
602 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
603 | return sprintf(buf, "%u\n", priv->autorecording); | |
604 | } | |
605 | ||
606 | ||
607 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
608 | vmlogrdr_autorecording_store); | |
609 | ||
610 | ||
c9101c5b MS |
611 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
612 | struct device_attribute *attr, | |
613 | const char * buf, size_t count) | |
614 | { | |
1da177e4 LT |
615 | struct vmlogrdr_priv_t *priv = dev->driver_data; |
616 | ssize_t ret; | |
617 | ||
618 | switch (buf[0]) { | |
619 | case '0': | |
620 | ret = vmlogrdr_recording(priv,0,0); | |
621 | break; | |
622 | case '1': | |
623 | ret = vmlogrdr_recording(priv,1,0); | |
624 | break; | |
625 | default: | |
626 | ret = -EINVAL; | |
627 | } | |
628 | if (ret) | |
629 | return ret; | |
630 | else | |
631 | return count; | |
632 | ||
633 | } | |
634 | ||
635 | ||
636 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
637 | ||
638 | ||
c9101c5b MS |
639 | static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver, |
640 | char *buf) | |
641 | { | |
1da177e4 LT |
642 | |
643 | char cp_command[] = "QUERY RECORDING "; | |
644 | int len; | |
645 | ||
6b979de3 | 646 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
647 | len = strlen(buf); |
648 | return len; | |
649 | } | |
650 | ||
651 | ||
652 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, | |
653 | NULL); | |
654 | ||
655 | static struct attribute *vmlogrdr_attrs[] = { | |
656 | &dev_attr_autopurge.attr, | |
657 | &dev_attr_purge.attr, | |
658 | &dev_attr_autorecording.attr, | |
659 | &dev_attr_recording.attr, | |
660 | NULL, | |
661 | }; | |
662 | ||
663 | static struct attribute_group vmlogrdr_attr_group = { | |
664 | .attrs = vmlogrdr_attrs, | |
665 | }; | |
666 | ||
56b22935 | 667 | static struct class *vmlogrdr_class; |
1da177e4 LT |
668 | static struct device_driver vmlogrdr_driver = { |
669 | .name = "vmlogrdr", | |
670 | .bus = &iucv_bus, | |
671 | }; | |
672 | ||
673 | ||
c9101c5b MS |
674 | static int vmlogrdr_register_driver(void) |
675 | { | |
1da177e4 LT |
676 | int ret; |
677 | ||
c9101c5b MS |
678 | /* Register with iucv driver */ |
679 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
2f6f2521 | 680 | if (ret) |
c9101c5b | 681 | goto out; |
c9101c5b | 682 | |
1da177e4 | 683 | ret = driver_register(&vmlogrdr_driver); |
2f6f2521 | 684 | if (ret) |
c9101c5b | 685 | goto out_iucv; |
1da177e4 LT |
686 | |
687 | ret = driver_create_file(&vmlogrdr_driver, | |
688 | &driver_attr_recording_status); | |
2f6f2521 | 689 | if (ret) |
c9101c5b | 690 | goto out_driver; |
1da177e4 | 691 | |
56b22935 | 692 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 | 693 | if (IS_ERR(vmlogrdr_class)) { |
c9101c5b MS |
694 | ret = PTR_ERR(vmlogrdr_class); |
695 | vmlogrdr_class = NULL; | |
696 | goto out_attr; | |
1da177e4 LT |
697 | } |
698 | return 0; | |
699 | ||
c9101c5b | 700 | out_attr: |
1da177e4 | 701 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); |
c9101c5b | 702 | out_driver: |
1da177e4 | 703 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
704 | out_iucv: |
705 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
706 | out: | |
1da177e4 LT |
707 | return ret; |
708 | } | |
709 | ||
710 | ||
c9101c5b MS |
711 | static void vmlogrdr_unregister_driver(void) |
712 | { | |
56b22935 | 713 | class_destroy(vmlogrdr_class); |
1da177e4 LT |
714 | vmlogrdr_class = NULL; |
715 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
716 | driver_unregister(&vmlogrdr_driver); | |
c9101c5b | 717 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
718 | } |
719 | ||
720 | ||
c9101c5b MS |
721 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
722 | { | |
1da177e4 LT |
723 | struct device *dev; |
724 | int ret; | |
725 | ||
88abaab4 | 726 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 727 | if (dev) { |
1bf5b285 | 728 | dev_set_name(dev, priv->internal_name); |
1da177e4 LT |
729 | dev->bus = &iucv_bus; |
730 | dev->parent = iucv_root; | |
731 | dev->driver = &vmlogrdr_driver; | |
732 | /* | |
733 | * The release function could be called after the | |
734 | * module has been unloaded. It's _only_ task is to | |
735 | * free the struct. Therefore, we specify kfree() | |
736 | * directly here. (Probably a little bit obfuscating | |
737 | * but legitime ...). | |
738 | */ | |
739 | dev->release = (void (*)(struct device *))kfree; | |
740 | } else | |
741 | return -ENOMEM; | |
742 | ret = device_register(dev); | |
743 | if (ret) | |
744 | return ret; | |
745 | ||
746 | ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group); | |
747 | if (ret) { | |
748 | device_unregister(dev); | |
749 | return ret; | |
750 | } | |
ea9e42f6 GKH |
751 | priv->class_device = device_create(vmlogrdr_class, dev, |
752 | MKDEV(vmlogrdr_major, | |
753 | priv->minor_num), | |
754 | priv, "%s", dev_name(dev)); | |
1da177e4 LT |
755 | if (IS_ERR(priv->class_device)) { |
756 | ret = PTR_ERR(priv->class_device); | |
757 | priv->class_device=NULL; | |
758 | sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group); | |
759 | device_unregister(dev); | |
760 | return ret; | |
761 | } | |
1da177e4 LT |
762 | priv->device = dev; |
763 | return 0; | |
764 | } | |
765 | ||
766 | ||
c9101c5b MS |
767 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
768 | { | |
7f021ce1 | 769 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 LT |
770 | if (priv->device != NULL) { |
771 | sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group); | |
772 | device_unregister(priv->device); | |
773 | priv->device=NULL; | |
774 | } | |
775 | return 0; | |
776 | } | |
777 | ||
778 | ||
c9101c5b MS |
779 | static int vmlogrdr_register_cdev(dev_t dev) |
780 | { | |
1da177e4 LT |
781 | int rc = 0; |
782 | vmlogrdr_cdev = cdev_alloc(); | |
783 | if (!vmlogrdr_cdev) { | |
784 | return -ENOMEM; | |
785 | } | |
786 | vmlogrdr_cdev->owner = THIS_MODULE; | |
787 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
788 | vmlogrdr_cdev->dev = dev; | |
789 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
790 | if (!rc) | |
791 | return 0; | |
792 | ||
793 | // cleanup: cdev is not fully registered, no cdev_del here! | |
794 | kobject_put(&vmlogrdr_cdev->kobj); | |
795 | vmlogrdr_cdev=NULL; | |
796 | return rc; | |
797 | } | |
798 | ||
799 | ||
c9101c5b MS |
800 | static void vmlogrdr_cleanup(void) |
801 | { | |
1da177e4 | 802 | int i; |
c9101c5b | 803 | |
1da177e4 LT |
804 | if (vmlogrdr_cdev) { |
805 | cdev_del(vmlogrdr_cdev); | |
806 | vmlogrdr_cdev=NULL; | |
807 | } | |
808 | for (i=0; i < MAXMINOR; ++i ) { | |
809 | vmlogrdr_unregister_device(&sys_ser[i]); | |
810 | free_page((unsigned long)sys_ser[i].buffer); | |
811 | } | |
812 | vmlogrdr_unregister_driver(); | |
813 | if (vmlogrdr_major) { | |
814 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
815 | vmlogrdr_major=0; | |
816 | } | |
817 | } | |
818 | ||
819 | ||
f60d8910 | 820 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
821 | { |
822 | int rc; | |
823 | int i; | |
824 | dev_t dev; | |
825 | ||
826 | if (! MACHINE_IS_VM) { | |
5466c2e4 | 827 | pr_err("not running under VM, driver not loaded.\n"); |
1da177e4 LT |
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); |