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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, | |
6038f373 | 100 | .llseek = no_llseek, |
1da177e4 LT |
101 | }; |
102 | ||
103 | ||
c9101c5b MS |
104 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]); |
105 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]); | |
106 | static void vmlogrdr_iucv_message_pending(struct iucv_path *, | |
107 | struct iucv_message *); | |
1da177e4 LT |
108 | |
109 | ||
c9101c5b MS |
110 | static struct iucv_handler vmlogrdr_iucv_handler = { |
111 | .path_complete = vmlogrdr_iucv_path_complete, | |
112 | .path_severed = vmlogrdr_iucv_path_severed, | |
113 | .message_pending = vmlogrdr_iucv_message_pending, | |
1da177e4 LT |
114 | }; |
115 | ||
116 | ||
2b67fc46 HC |
117 | static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); |
118 | static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
1da177e4 LT |
119 | |
120 | /* | |
121 | * pointer to system service private structure | |
122 | * minor number 0 --> logrec | |
123 | * minor number 1 --> account | |
124 | * minor number 2 --> symptom | |
125 | */ | |
126 | ||
127 | static struct vmlogrdr_priv_t sys_ser[] = { | |
128 | { .system_service = "*LOGREC ", | |
129 | .internal_name = "logrec", | |
130 | .recording_name = "EREP", | |
131 | .minor_num = 0, | |
132 | .buffer_free = 1, | |
cb629a01 | 133 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), |
1da177e4 LT |
134 | .autorecording = 1, |
135 | .autopurge = 1, | |
136 | }, | |
137 | { .system_service = "*ACCOUNT", | |
138 | .internal_name = "account", | |
139 | .recording_name = "ACCOUNT", | |
140 | .minor_num = 1, | |
141 | .buffer_free = 1, | |
cb629a01 | 142 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), |
1da177e4 LT |
143 | .autorecording = 1, |
144 | .autopurge = 1, | |
145 | }, | |
146 | { .system_service = "*SYMPTOM", | |
147 | .internal_name = "symptom", | |
148 | .recording_name = "SYMPTOM", | |
149 | .minor_num = 2, | |
150 | .buffer_free = 1, | |
cb629a01 | 151 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), |
1da177e4 LT |
152 | .autorecording = 1, |
153 | .autopurge = 1, | |
154 | } | |
155 | }; | |
156 | ||
157 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
158 | ||
159 | static char FENCE[] = {"EOR"}; | |
160 | static int vmlogrdr_major = 0; | |
161 | static struct cdev *vmlogrdr_cdev = NULL; | |
162 | static int recording_class_AB; | |
163 | ||
164 | ||
c9101c5b | 165 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 166 | { |
c9101c5b MS |
167 | struct vmlogrdr_priv_t * logptr = path->private; |
168 | ||
1da177e4 LT |
169 | spin_lock(&logptr->priv_lock); |
170 | logptr->connection_established = 1; | |
171 | spin_unlock(&logptr->priv_lock); | |
172 | wake_up(&conn_wait_queue); | |
1da177e4 LT |
173 | } |
174 | ||
175 | ||
c9101c5b | 176 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 177 | { |
c9101c5b MS |
178 | struct vmlogrdr_priv_t * logptr = path->private; |
179 | u8 reason = (u8) ipuser[8]; | |
1da177e4 | 180 | |
5466c2e4 | 181 | pr_err("vmlogrdr: connection severed with reason %i\n", reason); |
1da177e4 | 182 | |
c9101c5b MS |
183 | iucv_path_sever(path, NULL); |
184 | kfree(path); | |
185 | logptr->path = NULL; | |
186 | ||
1da177e4 LT |
187 | spin_lock(&logptr->priv_lock); |
188 | logptr->connection_established = 0; | |
189 | logptr->iucv_path_severed = 1; | |
190 | spin_unlock(&logptr->priv_lock); | |
191 | ||
192 | wake_up(&conn_wait_queue); | |
193 | /* just in case we're sleeping waiting for a record */ | |
194 | wake_up_interruptible(&read_wait_queue); | |
195 | } | |
196 | ||
197 | ||
c9101c5b MS |
198 | static void vmlogrdr_iucv_message_pending(struct iucv_path *path, |
199 | struct iucv_message *msg) | |
1da177e4 | 200 | { |
c9101c5b | 201 | struct vmlogrdr_priv_t * logptr = path->private; |
1da177e4 LT |
202 | |
203 | /* | |
204 | * This function is the bottom half so it should be quick. | |
205 | * Copy the external interrupt data into our local eib and increment | |
206 | * the usage count | |
207 | */ | |
208 | spin_lock(&logptr->priv_lock); | |
c9101c5b | 209 | memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); |
1da177e4 LT |
210 | atomic_inc(&logptr->receive_ready); |
211 | spin_unlock(&logptr->priv_lock); | |
212 | wake_up_interruptible(&read_wait_queue); | |
213 | } | |
214 | ||
215 | ||
c9101c5b MS |
216 | static int vmlogrdr_get_recording_class_AB(void) |
217 | { | |
bf2106ae | 218 | static const char cp_command[] = "QUERY COMMAND RECORDING "; |
1da177e4 LT |
219 | char cp_response[80]; |
220 | char *tail; | |
221 | int len,i; | |
222 | ||
6b979de3 | 223 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
224 | len = strnlen(cp_response,sizeof(cp_response)); |
225 | // now the parsing | |
226 | tail=strnchr(cp_response,len,'='); | |
227 | if (!tail) | |
228 | return 0; | |
229 | tail++; | |
230 | if (!strncmp("ANY",tail,3)) | |
231 | return 1; | |
232 | if (!strncmp("NONE",tail,4)) | |
233 | return 0; | |
234 | /* | |
235 | * expect comma separated list of classes here, if one of them | |
236 | * is A or B return 1 otherwise 0 | |
237 | */ | |
238 | for (i=tail-cp_response; i<len; i++) | |
239 | if ( cp_response[i]=='A' || cp_response[i]=='B' ) | |
240 | return 1; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | ||
c9101c5b MS |
245 | static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, |
246 | int action, int purge) | |
247 | { | |
1da177e4 LT |
248 | |
249 | char cp_command[80]; | |
250 | char cp_response[160]; | |
251 | char *onoff, *qid_string; | |
252 | ||
253 | memset(cp_command, 0x00, sizeof(cp_command)); | |
254 | memset(cp_response, 0x00, sizeof(cp_response)); | |
255 | ||
256 | onoff = ((action == 1) ? "ON" : "OFF"); | |
257 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); | |
258 | ||
259 | /* | |
260 | * The recording commands needs to be called with option QID | |
261 | * for guests that have previlege classes A or B. | |
262 | * Purging has to be done as separate step, because recording | |
263 | * can't be switched on as long as records are on the queue. | |
264 | * Doing both at the same time doesn't work. | |
265 | */ | |
266 | ||
267 | if (purge) { | |
268 | snprintf(cp_command, sizeof(cp_command), | |
269 | "RECORDING %s PURGE %s", | |
270 | logptr->recording_name, | |
271 | qid_string); | |
272 | ||
6b979de3 | 273 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
274 | } |
275 | ||
276 | memset(cp_command, 0x00, sizeof(cp_command)); | |
277 | memset(cp_response, 0x00, sizeof(cp_response)); | |
278 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
279 | logptr->recording_name, | |
280 | onoff, | |
281 | qid_string); | |
282 | ||
6b979de3 | 283 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
284 | /* The recording command will usually answer with 'Command complete' |
285 | * on success, but when the specific service was never connected | |
286 | * before then there might be an additional informational message | |
287 | * 'HCPCRC8072I Recording entry not found' before the | |
288 | * 'Command complete'. So I use strstr rather then the strncmp. | |
289 | */ | |
290 | if (strstr(cp_response,"Command complete")) | |
291 | return 0; | |
292 | else | |
293 | return -EIO; | |
294 | ||
295 | } | |
296 | ||
297 | ||
c9101c5b | 298 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
299 | { |
300 | int dev_num = 0; | |
301 | struct vmlogrdr_priv_t * logptr = NULL; | |
302 | int connect_rc = 0; | |
303 | int ret; | |
304 | ||
305 | dev_num = iminor(inode); | |
306 | if (dev_num > MAXMINOR) | |
307 | return -ENODEV; | |
1da177e4 | 308 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
309 | |
310 | /* | |
311 | * only allow for blocking reads to be open | |
312 | */ | |
313 | if (filp->f_flags & O_NONBLOCK) | |
314 | return -ENOSYS; | |
315 | ||
316 | /* Besure this device hasn't already been opened */ | |
317 | spin_lock_bh(&logptr->priv_lock); | |
318 | if (logptr->dev_in_use) { | |
319 | spin_unlock_bh(&logptr->priv_lock); | |
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; | |
3b47f9d5 MS |
363 | nonseekable_open(inode, filp); |
364 | return 0; | |
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 LT |
373 | logptr->dev_in_use = 0; |
374 | return -EIO; | |
1da177e4 LT |
375 | } |
376 | ||
377 | ||
c9101c5b | 378 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
379 | { |
380 | int ret; | |
381 | ||
382 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
383 | ||
66b494a7 UB |
384 | iucv_path_sever(logptr->path, NULL); |
385 | kfree(logptr->path); | |
386 | logptr->path = NULL; | |
1da177e4 LT |
387 | if (logptr->autorecording) { |
388 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
389 | if (ret) | |
5466c2e4 MS |
390 | pr_warning("vmlogrdr: failed to stop " |
391 | "recording automatically\n"); | |
1da177e4 LT |
392 | } |
393 | logptr->dev_in_use = 0; | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | ||
c9101c5b MS |
399 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
400 | { | |
1da177e4 LT |
401 | int rc, *temp; |
402 | /* we need to keep track of two data sizes here: | |
403 | * The number of bytes we need to receive from iucv and | |
404 | * the total number of bytes we actually write into the buffer. | |
405 | */ | |
406 | int user_data_count, iucv_data_count; | |
407 | char * buffer; | |
408 | ||
409 | if (atomic_read(&priv->receive_ready)) { | |
410 | spin_lock_bh(&priv->priv_lock); | |
411 | if (priv->residual_length){ | |
412 | /* receive second half of a record */ | |
413 | iucv_data_count = priv->residual_length; | |
414 | user_data_count = 0; | |
415 | buffer = priv->buffer; | |
416 | } else { | |
417 | /* receive a new record: | |
418 | * We need to return the total length of the record | |
419 | * + size of FENCE in the first 4 bytes of the buffer. | |
420 | */ | |
c9101c5b | 421 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
422 | user_data_count = sizeof(int); |
423 | temp = (int*)priv->buffer; | |
424 | *temp= iucv_data_count + sizeof(FENCE); | |
425 | buffer = priv->buffer + sizeof(int); | |
426 | } | |
427 | /* | |
025dfdaf | 428 | * If the record is bigger than our buffer, we receive only |
1da177e4 LT |
429 | * a part of it. We can get the rest later. |
430 | */ | |
431 | if (iucv_data_count > NET_BUFFER_SIZE) | |
432 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
433 | rc = iucv_message_receive(priv->path, |
434 | &priv->local_interrupt_buffer, | |
435 | 0, buffer, iucv_data_count, | |
436 | &priv->residual_length); | |
1da177e4 | 437 | spin_unlock_bh(&priv->priv_lock); |
025dfdaf | 438 | /* An rc of 5 indicates that the record was bigger than |
1da177e4 LT |
439 | * the buffer, which is OK for us. A 9 indicates that the |
440 | * record was purged befor we could receive it. | |
441 | */ | |
442 | if (rc == 5) | |
443 | rc = 0; | |
444 | if (rc == 9) | |
445 | atomic_set(&priv->receive_ready, 0); | |
446 | } else { | |
447 | rc = 1; | |
448 | } | |
449 | if (!rc) { | |
450 | priv->buffer_free = 0; | |
451 | user_data_count += iucv_data_count; | |
452 | priv->current_position = priv->buffer; | |
453 | if (priv->residual_length == 0){ | |
454 | /* the whole record has been captured, | |
455 | * now add the fence */ | |
456 | atomic_dec(&priv->receive_ready); | |
457 | buffer = priv->buffer + user_data_count; | |
458 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
459 | user_data_count += sizeof(FENCE); | |
460 | } | |
461 | priv->remaining = user_data_count; | |
462 | } | |
463 | ||
464 | return rc; | |
465 | } | |
466 | ||
467 | ||
c9101c5b MS |
468 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
469 | size_t count, loff_t * ppos) | |
1da177e4 LT |
470 | { |
471 | int rc; | |
472 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
473 | ||
474 | while (priv->buffer_free) { | |
475 | rc = vmlogrdr_receive_data(priv); | |
476 | if (rc) { | |
477 | rc = wait_event_interruptible(read_wait_queue, | |
478 | atomic_read(&priv->receive_ready)); | |
479 | if (rc) | |
480 | return rc; | |
481 | } | |
482 | } | |
483 | /* copy only up to end of record */ | |
484 | if (count > priv->remaining) | |
485 | count = priv->remaining; | |
486 | ||
487 | if (copy_to_user(data, priv->current_position, count)) | |
488 | return -EFAULT; | |
489 | ||
490 | *ppos += count; | |
491 | priv->current_position += count; | |
492 | priv->remaining -= count; | |
493 | ||
494 | /* if all data has been transferred, set buffer free */ | |
495 | if (priv->remaining == 0) | |
496 | priv->buffer_free = 1; | |
497 | ||
498 | return count; | |
499 | } | |
500 | ||
c9101c5b MS |
501 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
502 | struct device_attribute *attr, | |
503 | const char * buf, size_t count) | |
504 | { | |
dff59b64 | 505 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
506 | ssize_t ret = count; |
507 | ||
508 | switch (buf[0]) { | |
509 | case '0': | |
510 | priv->autopurge=0; | |
511 | break; | |
512 | case '1': | |
513 | priv->autopurge=1; | |
514 | break; | |
515 | default: | |
516 | ret = -EINVAL; | |
517 | } | |
518 | return ret; | |
519 | } | |
520 | ||
521 | ||
c9101c5b MS |
522 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
523 | struct device_attribute *attr, | |
524 | char *buf) | |
525 | { | |
dff59b64 | 526 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
527 | return sprintf(buf, "%u\n", priv->autopurge); |
528 | } | |
529 | ||
530 | ||
531 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
532 | vmlogrdr_autopurge_store); | |
533 | ||
534 | ||
c9101c5b MS |
535 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
536 | struct device_attribute *attr, | |
537 | const char * buf, size_t count) | |
538 | { | |
1da177e4 LT |
539 | |
540 | char cp_command[80]; | |
541 | char cp_response[80]; | |
dff59b64 | 542 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
543 | |
544 | if (buf[0] != '1') | |
545 | return -EINVAL; | |
546 | ||
547 | memset(cp_command, 0x00, sizeof(cp_command)); | |
548 | memset(cp_response, 0x00, sizeof(cp_response)); | |
549 | ||
550 | /* | |
551 | * The recording command needs to be called with option QID | |
552 | * for guests that have previlege classes A or B. | |
553 | * Other guests will not recognize the command and we have to | |
554 | * issue the same command without the QID parameter. | |
555 | */ | |
556 | ||
557 | if (recording_class_AB) | |
558 | snprintf(cp_command, sizeof(cp_command), | |
559 | "RECORDING %s PURGE QID * ", | |
560 | priv->recording_name); | |
561 | else | |
562 | snprintf(cp_command, sizeof(cp_command), | |
563 | "RECORDING %s PURGE ", | |
564 | priv->recording_name); | |
565 | ||
6b979de3 | 566 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
567 | |
568 | return count; | |
569 | } | |
570 | ||
571 | ||
572 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
573 | ||
574 | ||
c9101c5b MS |
575 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
576 | struct device_attribute *attr, | |
577 | const char *buf, size_t count) | |
578 | { | |
dff59b64 | 579 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
580 | ssize_t ret = count; |
581 | ||
582 | switch (buf[0]) { | |
583 | case '0': | |
584 | priv->autorecording=0; | |
585 | break; | |
586 | case '1': | |
587 | priv->autorecording=1; | |
588 | break; | |
589 | default: | |
590 | ret = -EINVAL; | |
591 | } | |
592 | return ret; | |
593 | } | |
594 | ||
595 | ||
c9101c5b MS |
596 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
597 | struct device_attribute *attr, | |
598 | char *buf) | |
599 | { | |
dff59b64 | 600 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
601 | return sprintf(buf, "%u\n", priv->autorecording); |
602 | } | |
603 | ||
604 | ||
605 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
606 | vmlogrdr_autorecording_store); | |
607 | ||
608 | ||
c9101c5b MS |
609 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
610 | struct device_attribute *attr, | |
611 | const char * buf, size_t count) | |
612 | { | |
dff59b64 | 613 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
614 | ssize_t ret; |
615 | ||
616 | switch (buf[0]) { | |
617 | case '0': | |
618 | ret = vmlogrdr_recording(priv,0,0); | |
619 | break; | |
620 | case '1': | |
621 | ret = vmlogrdr_recording(priv,1,0); | |
622 | break; | |
623 | default: | |
624 | ret = -EINVAL; | |
625 | } | |
626 | if (ret) | |
627 | return ret; | |
628 | else | |
629 | return count; | |
630 | ||
631 | } | |
632 | ||
633 | ||
634 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
635 | ||
636 | ||
c9101c5b MS |
637 | static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver, |
638 | char *buf) | |
639 | { | |
1da177e4 | 640 | |
bf2106ae | 641 | static const char cp_command[] = "QUERY RECORDING "; |
1da177e4 LT |
642 | int len; |
643 | ||
6b979de3 | 644 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
645 | len = strlen(buf); |
646 | return len; | |
647 | } | |
648 | ||
649 | ||
650 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, | |
651 | NULL); | |
652 | ||
653 | static struct attribute *vmlogrdr_attrs[] = { | |
654 | &dev_attr_autopurge.attr, | |
655 | &dev_attr_purge.attr, | |
656 | &dev_attr_autorecording.attr, | |
657 | &dev_attr_recording.attr, | |
658 | NULL, | |
659 | }; | |
660 | ||
9f62fa16 SW |
661 | static int vmlogrdr_pm_prepare(struct device *dev) |
662 | { | |
663 | int rc; | |
4f0076f7 | 664 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
9f62fa16 SW |
665 | |
666 | rc = 0; | |
667 | if (priv) { | |
668 | spin_lock_bh(&priv->priv_lock); | |
669 | if (priv->dev_in_use) | |
670 | rc = -EBUSY; | |
671 | spin_unlock_bh(&priv->priv_lock); | |
672 | } | |
673 | if (rc) | |
674 | pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n", | |
675 | dev_name(dev)); | |
676 | return rc; | |
677 | } | |
678 | ||
679 | ||
47145210 | 680 | static const struct dev_pm_ops vmlogrdr_pm_ops = { |
9f62fa16 SW |
681 | .prepare = vmlogrdr_pm_prepare, |
682 | }; | |
683 | ||
1da177e4 LT |
684 | static struct attribute_group vmlogrdr_attr_group = { |
685 | .attrs = vmlogrdr_attrs, | |
686 | }; | |
687 | ||
56b22935 | 688 | static struct class *vmlogrdr_class; |
1da177e4 LT |
689 | static struct device_driver vmlogrdr_driver = { |
690 | .name = "vmlogrdr", | |
691 | .bus = &iucv_bus, | |
9f62fa16 | 692 | .pm = &vmlogrdr_pm_ops, |
1da177e4 LT |
693 | }; |
694 | ||
695 | ||
c9101c5b MS |
696 | static int vmlogrdr_register_driver(void) |
697 | { | |
1da177e4 LT |
698 | int ret; |
699 | ||
c9101c5b MS |
700 | /* Register with iucv driver */ |
701 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
2f6f2521 | 702 | if (ret) |
c9101c5b | 703 | goto out; |
c9101c5b | 704 | |
1da177e4 | 705 | ret = driver_register(&vmlogrdr_driver); |
2f6f2521 | 706 | if (ret) |
c9101c5b | 707 | goto out_iucv; |
1da177e4 LT |
708 | |
709 | ret = driver_create_file(&vmlogrdr_driver, | |
710 | &driver_attr_recording_status); | |
2f6f2521 | 711 | if (ret) |
c9101c5b | 712 | goto out_driver; |
1da177e4 | 713 | |
56b22935 | 714 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 | 715 | if (IS_ERR(vmlogrdr_class)) { |
c9101c5b MS |
716 | ret = PTR_ERR(vmlogrdr_class); |
717 | vmlogrdr_class = NULL; | |
718 | goto out_attr; | |
1da177e4 LT |
719 | } |
720 | return 0; | |
721 | ||
c9101c5b | 722 | out_attr: |
1da177e4 | 723 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); |
c9101c5b | 724 | out_driver: |
1da177e4 | 725 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
726 | out_iucv: |
727 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
728 | out: | |
1da177e4 LT |
729 | return ret; |
730 | } | |
731 | ||
732 | ||
c9101c5b MS |
733 | static void vmlogrdr_unregister_driver(void) |
734 | { | |
56b22935 | 735 | class_destroy(vmlogrdr_class); |
1da177e4 LT |
736 | vmlogrdr_class = NULL; |
737 | driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status); | |
738 | driver_unregister(&vmlogrdr_driver); | |
c9101c5b | 739 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
740 | } |
741 | ||
742 | ||
c9101c5b MS |
743 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
744 | { | |
1da177e4 LT |
745 | struct device *dev; |
746 | int ret; | |
747 | ||
88abaab4 | 748 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 749 | if (dev) { |
1bf5b285 | 750 | dev_set_name(dev, priv->internal_name); |
1da177e4 LT |
751 | dev->bus = &iucv_bus; |
752 | dev->parent = iucv_root; | |
753 | dev->driver = &vmlogrdr_driver; | |
4f0076f7 | 754 | dev_set_drvdata(dev, priv); |
1da177e4 LT |
755 | /* |
756 | * The release function could be called after the | |
757 | * module has been unloaded. It's _only_ task is to | |
758 | * free the struct. Therefore, we specify kfree() | |
759 | * directly here. (Probably a little bit obfuscating | |
760 | * but legitime ...). | |
761 | */ | |
762 | dev->release = (void (*)(struct device *))kfree; | |
763 | } else | |
764 | return -ENOMEM; | |
765 | ret = device_register(dev); | |
c6304933 SO |
766 | if (ret) { |
767 | put_device(dev); | |
1da177e4 | 768 | return ret; |
c6304933 | 769 | } |
1da177e4 LT |
770 | |
771 | ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group); | |
772 | if (ret) { | |
773 | device_unregister(dev); | |
774 | return ret; | |
775 | } | |
ea9e42f6 GKH |
776 | priv->class_device = device_create(vmlogrdr_class, dev, |
777 | MKDEV(vmlogrdr_major, | |
778 | priv->minor_num), | |
779 | priv, "%s", dev_name(dev)); | |
1da177e4 LT |
780 | if (IS_ERR(priv->class_device)) { |
781 | ret = PTR_ERR(priv->class_device); | |
782 | priv->class_device=NULL; | |
783 | sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group); | |
784 | device_unregister(dev); | |
785 | return ret; | |
786 | } | |
1da177e4 LT |
787 | priv->device = dev; |
788 | return 0; | |
789 | } | |
790 | ||
791 | ||
c9101c5b MS |
792 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
793 | { | |
7f021ce1 | 794 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 LT |
795 | if (priv->device != NULL) { |
796 | sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group); | |
797 | device_unregister(priv->device); | |
798 | priv->device=NULL; | |
799 | } | |
800 | return 0; | |
801 | } | |
802 | ||
803 | ||
c9101c5b MS |
804 | static int vmlogrdr_register_cdev(dev_t dev) |
805 | { | |
1da177e4 LT |
806 | int rc = 0; |
807 | vmlogrdr_cdev = cdev_alloc(); | |
808 | if (!vmlogrdr_cdev) { | |
809 | return -ENOMEM; | |
810 | } | |
811 | vmlogrdr_cdev->owner = THIS_MODULE; | |
812 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
813 | vmlogrdr_cdev->dev = dev; | |
814 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
815 | if (!rc) | |
816 | return 0; | |
817 | ||
818 | // cleanup: cdev is not fully registered, no cdev_del here! | |
819 | kobject_put(&vmlogrdr_cdev->kobj); | |
820 | vmlogrdr_cdev=NULL; | |
821 | return rc; | |
822 | } | |
823 | ||
824 | ||
c9101c5b MS |
825 | static void vmlogrdr_cleanup(void) |
826 | { | |
1da177e4 | 827 | int i; |
c9101c5b | 828 | |
1da177e4 LT |
829 | if (vmlogrdr_cdev) { |
830 | cdev_del(vmlogrdr_cdev); | |
831 | vmlogrdr_cdev=NULL; | |
832 | } | |
833 | for (i=0; i < MAXMINOR; ++i ) { | |
834 | vmlogrdr_unregister_device(&sys_ser[i]); | |
835 | free_page((unsigned long)sys_ser[i].buffer); | |
836 | } | |
837 | vmlogrdr_unregister_driver(); | |
838 | if (vmlogrdr_major) { | |
839 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
840 | vmlogrdr_major=0; | |
841 | } | |
842 | } | |
843 | ||
844 | ||
f60d8910 | 845 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
846 | { |
847 | int rc; | |
848 | int i; | |
849 | dev_t dev; | |
850 | ||
851 | if (! MACHINE_IS_VM) { | |
5466c2e4 | 852 | pr_err("not running under VM, driver not loaded.\n"); |
1da177e4 LT |
853 | return -ENODEV; |
854 | } | |
855 | ||
856 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
857 | ||
858 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
859 | if (rc) | |
860 | return rc; | |
861 | vmlogrdr_major = MAJOR(dev); | |
862 | ||
863 | rc=vmlogrdr_register_driver(); | |
864 | if (rc) | |
865 | goto cleanup; | |
866 | ||
867 | for (i=0; i < MAXMINOR; ++i ) { | |
868 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
869 | if (!sys_ser[i].buffer) { | |
3cb2cea1 | 870 | rc = -ENOMEM; |
1da177e4 LT |
871 | break; |
872 | } | |
873 | sys_ser[i].current_position = sys_ser[i].buffer; | |
874 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
875 | if (rc) | |
876 | break; | |
877 | } | |
878 | if (rc) | |
879 | goto cleanup; | |
880 | ||
881 | rc = vmlogrdr_register_cdev(dev); | |
882 | if (rc) | |
883 | goto cleanup; | |
1da177e4 LT |
884 | return 0; |
885 | ||
886 | cleanup: | |
887 | vmlogrdr_cleanup(); | |
1da177e4 LT |
888 | return rc; |
889 | } | |
890 | ||
891 | ||
f60d8910 | 892 | static void __exit vmlogrdr_exit(void) |
1da177e4 LT |
893 | { |
894 | vmlogrdr_cleanup(); | |
1da177e4 LT |
895 | return; |
896 | } | |
897 | ||
898 | ||
899 | module_init(vmlogrdr_init); | |
900 | module_exit(vmlogrdr_exit); |