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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 | * | |
9f62fa16 | 6 | * Copyright IBM Corp. 2004, 2009 |
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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/errno.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <asm/atomic.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/cpcmd.h> | |
27 | #include <asm/debug.h> | |
28 | #include <asm/ebcdic.h> | |
c9101c5b | 29 | #include <net/iucv/iucv.h> |
1da177e4 LT |
30 | #include <linux/kmod.h> |
31 | #include <linux/cdev.h> | |
32 | #include <linux/device.h> | |
764a4a8e | 33 | #include <linux/smp_lock.h> |
1da177e4 LT |
34 | #include <linux/string.h> |
35 | ||
1da177e4 LT |
36 | MODULE_AUTHOR |
37 | ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n" | |
38 | " Stefan Weinhuber (wein@de.ibm.com)"); | |
39 | MODULE_DESCRIPTION ("Character device driver for reading z/VM " | |
40 | "system service records."); | |
41 | MODULE_LICENSE("GPL"); | |
42 | ||
43 | ||
44 | /* | |
45 | * The size of the buffer for iucv data transfer is one page, | |
46 | * but in addition to the data we read from iucv we also | |
47 | * place an integer and some characters into that buffer, | |
48 | * so the maximum size for record data is a little less then | |
49 | * one page. | |
50 | */ | |
51 | #define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE)) | |
52 | ||
53 | /* | |
54 | * The elements that are concurrently accessed by bottom halves are | |
55 | * connection_established, iucv_path_severed, local_interrupt_buffer | |
56 | * and receive_ready. The first three can be protected by | |
57 | * priv_lock. receive_ready is atomic, so it can be incremented and | |
58 | * decremented without holding a lock. | |
59 | * The variable dev_in_use needs to be protected by the lock, since | |
60 | * it's a flag used by open to make sure that the device is opened only | |
61 | * by one user at the same time. | |
62 | */ | |
63 | struct vmlogrdr_priv_t { | |
64 | char system_service[8]; | |
65 | char internal_name[8]; | |
66 | char recording_name[8]; | |
c9101c5b | 67 | struct iucv_path *path; |
1da177e4 LT |
68 | int connection_established; |
69 | int iucv_path_severed; | |
c9101c5b | 70 | struct iucv_message local_interrupt_buffer; |
1da177e4 | 71 | atomic_t receive_ready; |
1da177e4 LT |
72 | int minor_num; |
73 | char * buffer; | |
74 | char * current_position; | |
75 | int remaining; | |
76 | ulong residual_length; | |
77 | int buffer_free; | |
78 | int dev_in_use; /* 1: already opened, 0: not opened*/ | |
79 | spinlock_t priv_lock; | |
80 | struct device *device; | |
7f021ce1 | 81 | struct device *class_device; |
1da177e4 LT |
82 | int autorecording; |
83 | int autopurge; | |
84 | }; | |
85 | ||
86 | ||
87 | /* | |
88 | * File operation structure for vmlogrdr devices | |
89 | */ | |
90 | static int vmlogrdr_open(struct inode *, struct file *); | |
91 | static int vmlogrdr_release(struct inode *, struct file *); | |
d2c993d8 HC |
92 | static ssize_t vmlogrdr_read (struct file *filp, char __user *data, |
93 | size_t count, loff_t * ppos); | |
1da177e4 | 94 | |
d54b1fdb | 95 | static const struct file_operations vmlogrdr_fops = { |
1da177e4 LT |
96 | .owner = THIS_MODULE, |
97 | .open = vmlogrdr_open, | |
98 | .release = vmlogrdr_release, | |
99 | .read = vmlogrdr_read, | |
100 | }; | |
101 | ||
102 | ||
c9101c5b MS |
103 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]); |
104 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]); | |
105 | static void vmlogrdr_iucv_message_pending(struct iucv_path *, | |
106 | struct iucv_message *); | |
1da177e4 LT |
107 | |
108 | ||
c9101c5b MS |
109 | static struct iucv_handler vmlogrdr_iucv_handler = { |
110 | .path_complete = vmlogrdr_iucv_path_complete, | |
111 | .path_severed = vmlogrdr_iucv_path_severed, | |
112 | .message_pending = vmlogrdr_iucv_message_pending, | |
1da177e4 LT |
113 | }; |
114 | ||
115 | ||
2b67fc46 HC |
116 | static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); |
117 | static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
1da177e4 LT |
118 | |
119 | /* | |
120 | * pointer to system service private structure | |
121 | * minor number 0 --> logrec | |
122 | * minor number 1 --> account | |
123 | * minor number 2 --> symptom | |
124 | */ | |
125 | ||
126 | static struct vmlogrdr_priv_t sys_ser[] = { | |
127 | { .system_service = "*LOGREC ", | |
128 | .internal_name = "logrec", | |
129 | .recording_name = "EREP", | |
130 | .minor_num = 0, | |
131 | .buffer_free = 1, | |
cb629a01 | 132 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), |
1da177e4 LT |
133 | .autorecording = 1, |
134 | .autopurge = 1, | |
135 | }, | |
136 | { .system_service = "*ACCOUNT", | |
137 | .internal_name = "account", | |
138 | .recording_name = "ACCOUNT", | |
139 | .minor_num = 1, | |
140 | .buffer_free = 1, | |
cb629a01 | 141 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), |
1da177e4 LT |
142 | .autorecording = 1, |
143 | .autopurge = 1, | |
144 | }, | |
145 | { .system_service = "*SYMPTOM", | |
146 | .internal_name = "symptom", | |
147 | .recording_name = "SYMPTOM", | |
148 | .minor_num = 2, | |
149 | .buffer_free = 1, | |
cb629a01 | 150 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), |
1da177e4 LT |
151 | .autorecording = 1, |
152 | .autopurge = 1, | |
153 | } | |
154 | }; | |
155 | ||
156 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
157 | ||
158 | static char FENCE[] = {"EOR"}; | |
159 | static int vmlogrdr_major = 0; | |
160 | static struct cdev *vmlogrdr_cdev = NULL; | |
161 | static int recording_class_AB; | |
162 | ||
163 | ||
c9101c5b | 164 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 165 | { |
c9101c5b MS |
166 | struct vmlogrdr_priv_t * logptr = path->private; |
167 | ||
1da177e4 LT |
168 | spin_lock(&logptr->priv_lock); |
169 | logptr->connection_established = 1; | |
170 | spin_unlock(&logptr->priv_lock); | |
171 | wake_up(&conn_wait_queue); | |
1da177e4 LT |
172 | } |
173 | ||
174 | ||
c9101c5b | 175 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 176 | { |
c9101c5b MS |
177 | struct vmlogrdr_priv_t * logptr = path->private; |
178 | u8 reason = (u8) ipuser[8]; | |
1da177e4 | 179 | |
5466c2e4 | 180 | pr_err("vmlogrdr: connection severed with reason %i\n", reason); |
1da177e4 | 181 | |
c9101c5b MS |
182 | iucv_path_sever(path, NULL); |
183 | kfree(path); | |
184 | logptr->path = NULL; | |
185 | ||
1da177e4 LT |
186 | spin_lock(&logptr->priv_lock); |
187 | logptr->connection_established = 0; | |
188 | logptr->iucv_path_severed = 1; | |
189 | spin_unlock(&logptr->priv_lock); | |
190 | ||
191 | wake_up(&conn_wait_queue); | |
192 | /* just in case we're sleeping waiting for a record */ | |
193 | wake_up_interruptible(&read_wait_queue); | |
194 | } | |
195 | ||
196 | ||
c9101c5b MS |
197 | static void vmlogrdr_iucv_message_pending(struct iucv_path *path, |
198 | struct iucv_message *msg) | |
1da177e4 | 199 | { |
c9101c5b | 200 | struct vmlogrdr_priv_t * logptr = path->private; |
1da177e4 LT |
201 | |
202 | /* | |
203 | * This function is the bottom half so it should be quick. | |
204 | * Copy the external interrupt data into our local eib and increment | |
205 | * the usage count | |
206 | */ | |
207 | spin_lock(&logptr->priv_lock); | |
c9101c5b | 208 | memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); |
1da177e4 LT |
209 | atomic_inc(&logptr->receive_ready); |
210 | spin_unlock(&logptr->priv_lock); | |
211 | wake_up_interruptible(&read_wait_queue); | |
212 | } | |
213 | ||
214 | ||
c9101c5b MS |
215 | static int vmlogrdr_get_recording_class_AB(void) |
216 | { | |
1da177e4 LT |
217 | char cp_command[]="QUERY COMMAND RECORDING "; |
218 | char cp_response[80]; | |
219 | char *tail; | |
220 | int len,i; | |
221 | ||
6b979de3 | 222 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
223 | len = strnlen(cp_response,sizeof(cp_response)); |
224 | // now the parsing | |
225 | tail=strnchr(cp_response,len,'='); | |
226 | if (!tail) | |
227 | return 0; | |
228 | tail++; | |
229 | if (!strncmp("ANY",tail,3)) | |
230 | return 1; | |
231 | if (!strncmp("NONE",tail,4)) | |
232 | return 0; | |
233 | /* | |
234 | * expect comma separated list of classes here, if one of them | |
235 | * is A or B return 1 otherwise 0 | |
236 | */ | |
237 | for (i=tail-cp_response; i<len; i++) | |
238 | if ( cp_response[i]=='A' || cp_response[i]=='B' ) | |
239 | return 1; | |
240 | return 0; | |
241 | } | |
242 | ||
243 | ||
c9101c5b MS |
244 | static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, |
245 | int action, int purge) | |
246 | { | |
1da177e4 LT |
247 | |
248 | char cp_command[80]; | |
249 | char cp_response[160]; | |
250 | char *onoff, *qid_string; | |
251 | ||
252 | memset(cp_command, 0x00, sizeof(cp_command)); | |
253 | memset(cp_response, 0x00, sizeof(cp_response)); | |
254 | ||
255 | onoff = ((action == 1) ? "ON" : "OFF"); | |
256 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); | |
257 | ||
258 | /* | |
259 | * The recording commands needs to be called with option QID | |
260 | * for guests that have previlege classes A or B. | |
261 | * Purging has to be done as separate step, because recording | |
262 | * can't be switched on as long as records are on the queue. | |
263 | * Doing both at the same time doesn't work. | |
264 | */ | |
265 | ||
266 | if (purge) { | |
267 | snprintf(cp_command, sizeof(cp_command), | |
268 | "RECORDING %s PURGE %s", | |
269 | logptr->recording_name, | |
270 | qid_string); | |
271 | ||
6b979de3 | 272 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
273 | } |
274 | ||
275 | memset(cp_command, 0x00, sizeof(cp_command)); | |
276 | memset(cp_response, 0x00, sizeof(cp_response)); | |
277 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
278 | logptr->recording_name, | |
279 | onoff, | |
280 | qid_string); | |
281 | ||
6b979de3 | 282 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
283 | /* The recording command will usually answer with 'Command complete' |
284 | * on success, but when the specific service was never connected | |
285 | * before then there might be an additional informational message | |
286 | * 'HCPCRC8072I Recording entry not found' before the | |
287 | * 'Command complete'. So I use strstr rather then the strncmp. | |
288 | */ | |
289 | if (strstr(cp_response,"Command complete")) | |
290 | return 0; | |
291 | else | |
292 | return -EIO; | |
293 | ||
294 | } | |
295 | ||
296 | ||
c9101c5b | 297 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
298 | { |
299 | int dev_num = 0; | |
300 | struct vmlogrdr_priv_t * logptr = NULL; | |
301 | int connect_rc = 0; | |
302 | int ret; | |
303 | ||
304 | dev_num = iminor(inode); | |
305 | if (dev_num > MAXMINOR) | |
306 | return -ENODEV; | |
1da177e4 | 307 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
308 | |
309 | /* | |
310 | * only allow for blocking reads to be open | |
311 | */ | |
312 | if (filp->f_flags & O_NONBLOCK) | |
313 | return -ENOSYS; | |
314 | ||
315 | /* Besure this device hasn't already been opened */ | |
316 | spin_lock_bh(&logptr->priv_lock); | |
317 | if (logptr->dev_in_use) { | |
318 | spin_unlock_bh(&logptr->priv_lock); | |
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 | 335 | if (ret) |
5466c2e4 MS |
336 | pr_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 | 347 | if (connect_rc) { |
5466c2e4 MS |
348 | pr_err("vmlogrdr: iucv connection to %s " |
349 | "failed with rc %i \n", | |
350 | logptr->system_service, 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; | |
3b47f9d5 MS |
362 | nonseekable_open(inode, filp); |
363 | return 0; | |
1da177e4 | 364 | |
c9101c5b | 365 | out_record: |
1da177e4 LT |
366 | if (logptr->autorecording) |
367 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
c9101c5b MS |
368 | out_path: |
369 | kfree(logptr->path); /* kfree(NULL) is ok. */ | |
370 | logptr->path = NULL; | |
371 | out_dev: | |
1da177e4 LT |
372 | logptr->dev_in_use = 0; |
373 | return -EIO; | |
1da177e4 LT |
374 | } |
375 | ||
376 | ||
c9101c5b | 377 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
378 | { |
379 | int ret; | |
380 | ||
381 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
382 | ||
66b494a7 UB |
383 | iucv_path_sever(logptr->path, NULL); |
384 | kfree(logptr->path); | |
385 | logptr->path = NULL; | |
1da177e4 LT |
386 | if (logptr->autorecording) { |
387 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
388 | if (ret) | |
5466c2e4 MS |
389 | pr_warning("vmlogrdr: failed to stop " |
390 | "recording automatically\n"); | |
1da177e4 LT |
391 | } |
392 | logptr->dev_in_use = 0; | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | ||
c9101c5b MS |
398 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
399 | { | |
1da177e4 LT |
400 | int rc, *temp; |
401 | /* we need to keep track of two data sizes here: | |
402 | * The number of bytes we need to receive from iucv and | |
403 | * the total number of bytes we actually write into the buffer. | |
404 | */ | |
405 | int user_data_count, iucv_data_count; | |
406 | char * buffer; | |
407 | ||
408 | if (atomic_read(&priv->receive_ready)) { | |
409 | spin_lock_bh(&priv->priv_lock); | |
410 | if (priv->residual_length){ | |
411 | /* receive second half of a record */ | |
412 | iucv_data_count = priv->residual_length; | |
413 | user_data_count = 0; | |
414 | buffer = priv->buffer; | |
415 | } else { | |
416 | /* receive a new record: | |
417 | * We need to return the total length of the record | |
418 | * + size of FENCE in the first 4 bytes of the buffer. | |
419 | */ | |
c9101c5b | 420 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
421 | user_data_count = sizeof(int); |
422 | temp = (int*)priv->buffer; | |
423 | *temp= iucv_data_count + sizeof(FENCE); | |
424 | buffer = priv->buffer + sizeof(int); | |
425 | } | |
426 | /* | |
025dfdaf | 427 | * If the record is bigger than our buffer, we receive only |
1da177e4 LT |
428 | * a part of it. We can get the rest later. |
429 | */ | |
430 | if (iucv_data_count > NET_BUFFER_SIZE) | |
431 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
432 | rc = iucv_message_receive(priv->path, |
433 | &priv->local_interrupt_buffer, | |
434 | 0, buffer, iucv_data_count, | |
435 | &priv->residual_length); | |
1da177e4 | 436 | spin_unlock_bh(&priv->priv_lock); |
025dfdaf | 437 | /* An rc of 5 indicates that the record was bigger than |
1da177e4 LT |
438 | * the buffer, which is OK for us. A 9 indicates that the |
439 | * record was purged befor we could receive it. | |
440 | */ | |
441 | if (rc == 5) | |
442 | rc = 0; | |
443 | if (rc == 9) | |
444 | atomic_set(&priv->receive_ready, 0); | |
445 | } else { | |
446 | rc = 1; | |
447 | } | |
448 | if (!rc) { | |
449 | priv->buffer_free = 0; | |
450 | user_data_count += iucv_data_count; | |
451 | priv->current_position = priv->buffer; | |
452 | if (priv->residual_length == 0){ | |
453 | /* the whole record has been captured, | |
454 | * now add the fence */ | |
455 | atomic_dec(&priv->receive_ready); | |
456 | buffer = priv->buffer + user_data_count; | |
457 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
458 | user_data_count += sizeof(FENCE); | |
459 | } | |
460 | priv->remaining = user_data_count; | |
461 | } | |
462 | ||
463 | return rc; | |
464 | } | |
465 | ||
466 | ||
c9101c5b MS |
467 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
468 | size_t count, loff_t * ppos) | |
1da177e4 LT |
469 | { |
470 | int rc; | |
471 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
472 | ||
473 | while (priv->buffer_free) { | |
474 | rc = vmlogrdr_receive_data(priv); | |
475 | if (rc) { | |
476 | rc = wait_event_interruptible(read_wait_queue, | |
477 | atomic_read(&priv->receive_ready)); | |
478 | if (rc) | |
479 | return rc; | |
480 | } | |
481 | } | |
482 | /* copy only up to end of record */ | |
483 | if (count > priv->remaining) | |
484 | count = priv->remaining; | |
485 | ||
486 | if (copy_to_user(data, priv->current_position, count)) | |
487 | return -EFAULT; | |
488 | ||
489 | *ppos += count; | |
490 | priv->current_position += count; | |
491 | priv->remaining -= count; | |
492 | ||
493 | /* if all data has been transferred, set buffer free */ | |
494 | if (priv->remaining == 0) | |
495 | priv->buffer_free = 1; | |
496 | ||
497 | return count; | |
498 | } | |
499 | ||
c9101c5b MS |
500 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
501 | struct device_attribute *attr, | |
502 | const char * buf, size_t count) | |
503 | { | |
dff59b64 | 504 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
505 | ssize_t ret = count; |
506 | ||
507 | switch (buf[0]) { | |
508 | case '0': | |
509 | priv->autopurge=0; | |
510 | break; | |
511 | case '1': | |
512 | priv->autopurge=1; | |
513 | break; | |
514 | default: | |
515 | ret = -EINVAL; | |
516 | } | |
517 | return ret; | |
518 | } | |
519 | ||
520 | ||
c9101c5b MS |
521 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
522 | struct device_attribute *attr, | |
523 | char *buf) | |
524 | { | |
dff59b64 | 525 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
526 | return sprintf(buf, "%u\n", priv->autopurge); |
527 | } | |
528 | ||
529 | ||
530 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
531 | vmlogrdr_autopurge_store); | |
532 | ||
533 | ||
c9101c5b MS |
534 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
535 | struct device_attribute *attr, | |
536 | const char * buf, size_t count) | |
537 | { | |
1da177e4 LT |
538 | |
539 | char cp_command[80]; | |
540 | char cp_response[80]; | |
dff59b64 | 541 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
542 | |
543 | if (buf[0] != '1') | |
544 | return -EINVAL; | |
545 | ||
546 | memset(cp_command, 0x00, sizeof(cp_command)); | |
547 | memset(cp_response, 0x00, sizeof(cp_response)); | |
548 | ||
549 | /* | |
550 | * The recording command needs to be called with option QID | |
551 | * for guests that have previlege classes A or B. | |
552 | * Other guests will not recognize the command and we have to | |
553 | * issue the same command without the QID parameter. | |
554 | */ | |
555 | ||
556 | if (recording_class_AB) | |
557 | snprintf(cp_command, sizeof(cp_command), | |
558 | "RECORDING %s PURGE QID * ", | |
559 | priv->recording_name); | |
560 | else | |
561 | snprintf(cp_command, sizeof(cp_command), | |
562 | "RECORDING %s PURGE ", | |
563 | priv->recording_name); | |
564 | ||
6b979de3 | 565 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
566 | |
567 | return count; | |
568 | } | |
569 | ||
570 | ||
571 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
572 | ||
573 | ||
c9101c5b MS |
574 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
575 | struct device_attribute *attr, | |
576 | const char *buf, size_t count) | |
577 | { | |
dff59b64 | 578 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
579 | ssize_t ret = count; |
580 | ||
581 | switch (buf[0]) { | |
582 | case '0': | |
583 | priv->autorecording=0; | |
584 | break; | |
585 | case '1': | |
586 | priv->autorecording=1; | |
587 | break; | |
588 | default: | |
589 | ret = -EINVAL; | |
590 | } | |
591 | return ret; | |
592 | } | |
593 | ||
594 | ||
c9101c5b MS |
595 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
596 | struct device_attribute *attr, | |
597 | char *buf) | |
598 | { | |
dff59b64 | 599 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
600 | return sprintf(buf, "%u\n", priv->autorecording); |
601 | } | |
602 | ||
603 | ||
604 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
605 | vmlogrdr_autorecording_store); | |
606 | ||
607 | ||
c9101c5b MS |
608 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
609 | struct device_attribute *attr, | |
610 | const char * buf, size_t count) | |
611 | { | |
dff59b64 | 612 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
613 | ssize_t ret; |
614 | ||
615 | switch (buf[0]) { | |
616 | case '0': | |
617 | ret = vmlogrdr_recording(priv,0,0); | |
618 | break; | |
619 | case '1': | |
620 | ret = vmlogrdr_recording(priv,1,0); | |
621 | break; | |
622 | default: | |
623 | ret = -EINVAL; | |
624 | } | |
625 | if (ret) | |
626 | return ret; | |
627 | else | |
628 | return count; | |
629 | ||
630 | } | |
631 | ||
632 | ||
633 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
634 | ||
635 | ||
c9101c5b MS |
636 | static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver, |
637 | char *buf) | |
638 | { | |
1da177e4 LT |
639 | |
640 | char cp_command[] = "QUERY RECORDING "; | |
641 | int len; | |
642 | ||
6b979de3 | 643 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
644 | len = strlen(buf); |
645 | return len; | |
646 | } | |
647 | ||
648 | ||
649 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, | |
650 | NULL); | |
651 | ||
652 | static struct attribute *vmlogrdr_attrs[] = { | |
653 | &dev_attr_autopurge.attr, | |
654 | &dev_attr_purge.attr, | |
655 | &dev_attr_autorecording.attr, | |
656 | &dev_attr_recording.attr, | |
657 | NULL, | |
658 | }; | |
659 | ||
9f62fa16 SW |
660 | static int vmlogrdr_pm_prepare(struct device *dev) |
661 | { | |
662 | int rc; | |
4f0076f7 | 663 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
9f62fa16 SW |
664 | |
665 | rc = 0; | |
666 | if (priv) { | |
667 | spin_lock_bh(&priv->priv_lock); | |
668 | if (priv->dev_in_use) | |
669 | rc = -EBUSY; | |
670 | spin_unlock_bh(&priv->priv_lock); | |
671 | } | |
672 | if (rc) | |
673 | pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n", | |
674 | dev_name(dev)); | |
675 | return rc; | |
676 | } | |
677 | ||
678 | ||
47145210 | 679 | static const struct dev_pm_ops vmlogrdr_pm_ops = { |
9f62fa16 SW |
680 | .prepare = vmlogrdr_pm_prepare, |
681 | }; | |
682 | ||
1da177e4 LT |
683 | static struct attribute_group vmlogrdr_attr_group = { |
684 | .attrs = vmlogrdr_attrs, | |
685 | }; | |
686 | ||
56b22935 | 687 | static struct class *vmlogrdr_class; |
1da177e4 LT |
688 | static struct device_driver vmlogrdr_driver = { |
689 | .name = "vmlogrdr", | |
690 | .bus = &iucv_bus, | |
9f62fa16 | 691 | .pm = &vmlogrdr_pm_ops, |
1da177e4 LT |
692 | }; |
693 | ||
694 | ||
c9101c5b MS |
695 | static int vmlogrdr_register_driver(void) |
696 | { | |
1da177e4 LT |
697 | int ret; |
698 | ||
c9101c5b MS |
699 | /* Register with iucv driver */ |
700 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
2f6f2521 | 701 | if (ret) |
c9101c5b | 702 | goto out; |
c9101c5b | 703 | |
1da177e4 | 704 | ret = driver_register(&vmlogrdr_driver); |
2f6f2521 | 705 | if (ret) |
c9101c5b | 706 | goto out_iucv; |
1da177e4 LT |
707 | |
708 | ret = driver_create_file(&vmlogrdr_driver, | |
709 | &driver_attr_recording_status); | |
2f6f2521 | 710 | if (ret) |
c9101c5b | 711 | goto out_driver; |
1da177e4 | 712 | |
56b22935 | 713 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 | 714 | if (IS_ERR(vmlogrdr_class)) { |
c9101c5b MS |
715 | ret = PTR_ERR(vmlogrdr_class); |
716 | vmlogrdr_class = NULL; | |
717 | goto out_attr; | |
1da177e4 LT |
718 | } |
719 | return 0; | |
720 | ||
c9101c5b | 721 | out_attr: |
1da177e4 | 722 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); |
c9101c5b | 723 | out_driver: |
1da177e4 | 724 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
725 | out_iucv: |
726 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
727 | out: | |
1da177e4 LT |
728 | return ret; |
729 | } | |
730 | ||
731 | ||
c9101c5b MS |
732 | static void vmlogrdr_unregister_driver(void) |
733 | { | |
56b22935 | 734 | class_destroy(vmlogrdr_class); |
1da177e4 LT |
735 | vmlogrdr_class = NULL; |
736 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
737 | driver_unregister(&vmlogrdr_driver); | |
c9101c5b | 738 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
739 | } |
740 | ||
741 | ||
c9101c5b MS |
742 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
743 | { | |
1da177e4 LT |
744 | struct device *dev; |
745 | int ret; | |
746 | ||
88abaab4 | 747 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 748 | if (dev) { |
1bf5b285 | 749 | dev_set_name(dev, priv->internal_name); |
1da177e4 LT |
750 | dev->bus = &iucv_bus; |
751 | dev->parent = iucv_root; | |
752 | dev->driver = &vmlogrdr_driver; | |
4f0076f7 | 753 | dev_set_drvdata(dev, priv); |
1da177e4 LT |
754 | /* |
755 | * The release function could be called after the | |
756 | * module has been unloaded. It's _only_ task is to | |
757 | * free the struct. Therefore, we specify kfree() | |
758 | * directly here. (Probably a little bit obfuscating | |
759 | * but legitime ...). | |
760 | */ | |
761 | dev->release = (void (*)(struct device *))kfree; | |
762 | } else | |
763 | return -ENOMEM; | |
764 | ret = device_register(dev); | |
c6304933 SO |
765 | if (ret) { |
766 | put_device(dev); | |
1da177e4 | 767 | return ret; |
c6304933 | 768 | } |
1da177e4 LT |
769 | |
770 | ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group); | |
771 | if (ret) { | |
772 | device_unregister(dev); | |
773 | return ret; | |
774 | } | |
ea9e42f6 GKH |
775 | priv->class_device = device_create(vmlogrdr_class, dev, |
776 | MKDEV(vmlogrdr_major, | |
777 | priv->minor_num), | |
778 | priv, "%s", dev_name(dev)); | |
1da177e4 LT |
779 | if (IS_ERR(priv->class_device)) { |
780 | ret = PTR_ERR(priv->class_device); | |
781 | priv->class_device=NULL; | |
782 | sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group); | |
783 | device_unregister(dev); | |
784 | return ret; | |
785 | } | |
1da177e4 LT |
786 | priv->device = dev; |
787 | return 0; | |
788 | } | |
789 | ||
790 | ||
c9101c5b MS |
791 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
792 | { | |
7f021ce1 | 793 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 LT |
794 | if (priv->device != NULL) { |
795 | sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group); | |
796 | device_unregister(priv->device); | |
797 | priv->device=NULL; | |
798 | } | |
799 | return 0; | |
800 | } | |
801 | ||
802 | ||
c9101c5b MS |
803 | static int vmlogrdr_register_cdev(dev_t dev) |
804 | { | |
1da177e4 LT |
805 | int rc = 0; |
806 | vmlogrdr_cdev = cdev_alloc(); | |
807 | if (!vmlogrdr_cdev) { | |
808 | return -ENOMEM; | |
809 | } | |
810 | vmlogrdr_cdev->owner = THIS_MODULE; | |
811 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
812 | vmlogrdr_cdev->dev = dev; | |
813 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
814 | if (!rc) | |
815 | return 0; | |
816 | ||
817 | // cleanup: cdev is not fully registered, no cdev_del here! | |
818 | kobject_put(&vmlogrdr_cdev->kobj); | |
819 | vmlogrdr_cdev=NULL; | |
820 | return rc; | |
821 | } | |
822 | ||
823 | ||
c9101c5b MS |
824 | static void vmlogrdr_cleanup(void) |
825 | { | |
1da177e4 | 826 | int i; |
c9101c5b | 827 | |
1da177e4 LT |
828 | if (vmlogrdr_cdev) { |
829 | cdev_del(vmlogrdr_cdev); | |
830 | vmlogrdr_cdev=NULL; | |
831 | } | |
832 | for (i=0; i < MAXMINOR; ++i ) { | |
833 | vmlogrdr_unregister_device(&sys_ser[i]); | |
834 | free_page((unsigned long)sys_ser[i].buffer); | |
835 | } | |
836 | vmlogrdr_unregister_driver(); | |
837 | if (vmlogrdr_major) { | |
838 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
839 | vmlogrdr_major=0; | |
840 | } | |
841 | } | |
842 | ||
843 | ||
f60d8910 | 844 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
845 | { |
846 | int rc; | |
847 | int i; | |
848 | dev_t dev; | |
849 | ||
850 | if (! MACHINE_IS_VM) { | |
5466c2e4 | 851 | pr_err("not running under VM, driver not loaded.\n"); |
1da177e4 LT |
852 | return -ENODEV; |
853 | } | |
854 | ||
855 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
856 | ||
857 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
858 | if (rc) | |
859 | return rc; | |
860 | vmlogrdr_major = MAJOR(dev); | |
861 | ||
862 | rc=vmlogrdr_register_driver(); | |
863 | if (rc) | |
864 | goto cleanup; | |
865 | ||
866 | for (i=0; i < MAXMINOR; ++i ) { | |
867 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
868 | if (!sys_ser[i].buffer) { | |
3cb2cea1 | 869 | rc = -ENOMEM; |
1da177e4 LT |
870 | break; |
871 | } | |
872 | sys_ser[i].current_position = sys_ser[i].buffer; | |
873 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
874 | if (rc) | |
875 | break; | |
876 | } | |
877 | if (rc) | |
878 | goto cleanup; | |
879 | ||
880 | rc = vmlogrdr_register_cdev(dev); | |
881 | if (rc) | |
882 | goto cleanup; | |
1da177e4 LT |
883 | return 0; |
884 | ||
885 | cleanup: | |
886 | vmlogrdr_cleanup(); | |
1da177e4 LT |
887 | return rc; |
888 | } | |
889 | ||
890 | ||
f60d8910 | 891 | static void __exit vmlogrdr_exit(void) |
1da177e4 LT |
892 | { |
893 | vmlogrdr_cleanup(); | |
1da177e4 LT |
894 | return; |
895 | } | |
896 | ||
897 | ||
898 | module_init(vmlogrdr_init); | |
899 | module_exit(vmlogrdr_exit); |