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6f05e69e | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
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> | |
60063497 | 24 | #include <linux/atomic.h> |
7c0f6ba6 | 25 | #include <linux/uaccess.h> |
1da177e4 LT |
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> | |
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, | |
6038f373 | 99 | .llseek = no_llseek, |
1da177e4 LT |
100 | }; |
101 | ||
102 | ||
91e60eb6 UB |
103 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 *ipuser); |
104 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 *ipuser); | |
c9101c5b MS |
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 | ||
91e60eb6 | 164 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 *ipuser) |
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 | ||
91e60eb6 | 175 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 *ipuser) |
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 | { | |
bf2106ae | 217 | static const char cp_command[] = "QUERY COMMAND RECORDING "; |
1da177e4 LT |
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; | |
ca768b66 | 251 | int rc; |
1da177e4 | 252 | |
ca768b66 | 253 | onoff = ((action == 1) ? "ON" : "OFF"); |
1da177e4 LT |
254 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); |
255 | ||
ca768b66 | 256 | /* |
1da177e4 LT |
257 | * The recording commands needs to be called with option QID |
258 | * for guests that have previlege classes A or B. | |
259 | * Purging has to be done as separate step, because recording | |
260 | * can't be switched on as long as records are on the queue. | |
261 | * Doing both at the same time doesn't work. | |
262 | */ | |
ca768b66 SW |
263 | if (purge && (action == 1)) { |
264 | memset(cp_command, 0x00, sizeof(cp_command)); | |
265 | memset(cp_response, 0x00, sizeof(cp_response)); | |
1da177e4 LT |
266 | snprintf(cp_command, sizeof(cp_command), |
267 | "RECORDING %s PURGE %s", | |
268 | logptr->recording_name, | |
269 | qid_string); | |
6b979de3 | 270 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
271 | } |
272 | ||
273 | memset(cp_command, 0x00, sizeof(cp_command)); | |
274 | memset(cp_response, 0x00, sizeof(cp_response)); | |
275 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
276 | logptr->recording_name, | |
277 | onoff, | |
278 | qid_string); | |
6b979de3 | 279 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
280 | /* The recording command will usually answer with 'Command complete' |
281 | * on success, but when the specific service was never connected | |
282 | * before then there might be an additional informational message | |
283 | * 'HCPCRC8072I Recording entry not found' before the | |
ca768b66 | 284 | * 'Command complete'. So I use strstr rather then the strncmp. |
1da177e4 LT |
285 | */ |
286 | if (strstr(cp_response,"Command complete")) | |
ca768b66 | 287 | rc = 0; |
1da177e4 | 288 | else |
ca768b66 SW |
289 | rc = -EIO; |
290 | /* | |
291 | * If we turn recording off, we have to purge any remaining records | |
292 | * afterwards, as a large number of queued records may impact z/VM | |
293 | * performance. | |
294 | */ | |
295 | if (purge && (action == 0)) { | |
296 | memset(cp_command, 0x00, sizeof(cp_command)); | |
297 | memset(cp_response, 0x00, sizeof(cp_response)); | |
298 | snprintf(cp_command, sizeof(cp_command), | |
299 | "RECORDING %s PURGE %s", | |
300 | logptr->recording_name, | |
301 | qid_string); | |
302 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); | |
303 | } | |
1da177e4 | 304 | |
ca768b66 | 305 | return rc; |
1da177e4 LT |
306 | } |
307 | ||
308 | ||
c9101c5b | 309 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
310 | { |
311 | int dev_num = 0; | |
312 | struct vmlogrdr_priv_t * logptr = NULL; | |
313 | int connect_rc = 0; | |
314 | int ret; | |
315 | ||
316 | dev_num = iminor(inode); | |
9784bd4f | 317 | if (dev_num >= MAXMINOR) |
1da177e4 | 318 | return -ENODEV; |
1da177e4 | 319 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
320 | |
321 | /* | |
322 | * only allow for blocking reads to be open | |
323 | */ | |
324 | if (filp->f_flags & O_NONBLOCK) | |
745e967a | 325 | return -EOPNOTSUPP; |
1da177e4 LT |
326 | |
327 | /* Besure this device hasn't already been opened */ | |
328 | spin_lock_bh(&logptr->priv_lock); | |
329 | if (logptr->dev_in_use) { | |
330 | spin_unlock_bh(&logptr->priv_lock); | |
331 | return -EBUSY; | |
1da177e4 | 332 | } |
c9101c5b MS |
333 | logptr->dev_in_use = 1; |
334 | logptr->connection_established = 0; | |
335 | logptr->iucv_path_severed = 0; | |
1da177e4 LT |
336 | atomic_set(&logptr->receive_ready, 0); |
337 | logptr->buffer_free = 1; | |
c9101c5b | 338 | spin_unlock_bh(&logptr->priv_lock); |
1da177e4 LT |
339 | |
340 | /* set the file options */ | |
341 | filp->private_data = logptr; | |
1da177e4 LT |
342 | |
343 | /* start recording for this service*/ | |
c9101c5b | 344 | if (logptr->autorecording) { |
1da177e4 | 345 | ret = vmlogrdr_recording(logptr,1,logptr->autopurge); |
c9101c5b | 346 | if (ret) |
baebc70a | 347 | pr_warn("vmlogrdr: failed to start recording automatically\n"); |
1da177e4 LT |
348 | } |
349 | ||
350 | /* create connection to the system service */ | |
c9101c5b MS |
351 | logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL); |
352 | if (!logptr->path) | |
353 | goto out_dev; | |
354 | connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler, | |
355 | logptr->system_service, NULL, NULL, | |
356 | logptr); | |
1da177e4 | 357 | if (connect_rc) { |
5466c2e4 MS |
358 | pr_err("vmlogrdr: iucv connection to %s " |
359 | "failed with rc %i \n", | |
360 | logptr->system_service, connect_rc); | |
c9101c5b | 361 | goto out_path; |
1da177e4 LT |
362 | } |
363 | ||
364 | /* We've issued the connect and now we must wait for a | |
365 | * ConnectionComplete or ConnectinSevered Interrupt | |
366 | * before we can continue to process. | |
367 | */ | |
368 | wait_event(conn_wait_queue, (logptr->connection_established) | |
369 | || (logptr->iucv_path_severed)); | |
c9101c5b MS |
370 | if (logptr->iucv_path_severed) |
371 | goto out_record; | |
3b47f9d5 MS |
372 | nonseekable_open(inode, filp); |
373 | return 0; | |
1da177e4 | 374 | |
c9101c5b | 375 | out_record: |
1da177e4 LT |
376 | if (logptr->autorecording) |
377 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
c9101c5b MS |
378 | out_path: |
379 | kfree(logptr->path); /* kfree(NULL) is ok. */ | |
380 | logptr->path = NULL; | |
381 | out_dev: | |
1da177e4 LT |
382 | logptr->dev_in_use = 0; |
383 | return -EIO; | |
1da177e4 LT |
384 | } |
385 | ||
386 | ||
c9101c5b | 387 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
388 | { |
389 | int ret; | |
390 | ||
391 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
392 | ||
66b494a7 UB |
393 | iucv_path_sever(logptr->path, NULL); |
394 | kfree(logptr->path); | |
395 | logptr->path = NULL; | |
1da177e4 LT |
396 | if (logptr->autorecording) { |
397 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
398 | if (ret) | |
baebc70a | 399 | pr_warn("vmlogrdr: failed to stop recording automatically\n"); |
1da177e4 LT |
400 | } |
401 | logptr->dev_in_use = 0; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | ||
c9101c5b MS |
407 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
408 | { | |
1da177e4 LT |
409 | int rc, *temp; |
410 | /* we need to keep track of two data sizes here: | |
411 | * The number of bytes we need to receive from iucv and | |
412 | * the total number of bytes we actually write into the buffer. | |
413 | */ | |
414 | int user_data_count, iucv_data_count; | |
415 | char * buffer; | |
416 | ||
417 | if (atomic_read(&priv->receive_ready)) { | |
418 | spin_lock_bh(&priv->priv_lock); | |
419 | if (priv->residual_length){ | |
420 | /* receive second half of a record */ | |
421 | iucv_data_count = priv->residual_length; | |
422 | user_data_count = 0; | |
423 | buffer = priv->buffer; | |
424 | } else { | |
425 | /* receive a new record: | |
426 | * We need to return the total length of the record | |
427 | * + size of FENCE in the first 4 bytes of the buffer. | |
428 | */ | |
c9101c5b | 429 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
430 | user_data_count = sizeof(int); |
431 | temp = (int*)priv->buffer; | |
432 | *temp= iucv_data_count + sizeof(FENCE); | |
433 | buffer = priv->buffer + sizeof(int); | |
434 | } | |
435 | /* | |
025dfdaf | 436 | * If the record is bigger than our buffer, we receive only |
1da177e4 LT |
437 | * a part of it. We can get the rest later. |
438 | */ | |
439 | if (iucv_data_count > NET_BUFFER_SIZE) | |
440 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
441 | rc = iucv_message_receive(priv->path, |
442 | &priv->local_interrupt_buffer, | |
443 | 0, buffer, iucv_data_count, | |
444 | &priv->residual_length); | |
1da177e4 | 445 | spin_unlock_bh(&priv->priv_lock); |
025dfdaf | 446 | /* An rc of 5 indicates that the record was bigger than |
1da177e4 LT |
447 | * the buffer, which is OK for us. A 9 indicates that the |
448 | * record was purged befor we could receive it. | |
449 | */ | |
450 | if (rc == 5) | |
451 | rc = 0; | |
452 | if (rc == 9) | |
453 | atomic_set(&priv->receive_ready, 0); | |
454 | } else { | |
455 | rc = 1; | |
456 | } | |
457 | if (!rc) { | |
458 | priv->buffer_free = 0; | |
459 | user_data_count += iucv_data_count; | |
460 | priv->current_position = priv->buffer; | |
461 | if (priv->residual_length == 0){ | |
462 | /* the whole record has been captured, | |
463 | * now add the fence */ | |
464 | atomic_dec(&priv->receive_ready); | |
465 | buffer = priv->buffer + user_data_count; | |
466 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
467 | user_data_count += sizeof(FENCE); | |
468 | } | |
469 | priv->remaining = user_data_count; | |
470 | } | |
471 | ||
472 | return rc; | |
473 | } | |
474 | ||
475 | ||
c9101c5b MS |
476 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
477 | size_t count, loff_t * ppos) | |
1da177e4 LT |
478 | { |
479 | int rc; | |
480 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
481 | ||
482 | while (priv->buffer_free) { | |
483 | rc = vmlogrdr_receive_data(priv); | |
484 | if (rc) { | |
485 | rc = wait_event_interruptible(read_wait_queue, | |
486 | atomic_read(&priv->receive_ready)); | |
487 | if (rc) | |
488 | return rc; | |
489 | } | |
490 | } | |
491 | /* copy only up to end of record */ | |
492 | if (count > priv->remaining) | |
493 | count = priv->remaining; | |
494 | ||
495 | if (copy_to_user(data, priv->current_position, count)) | |
496 | return -EFAULT; | |
497 | ||
498 | *ppos += count; | |
499 | priv->current_position += count; | |
500 | priv->remaining -= count; | |
501 | ||
502 | /* if all data has been transferred, set buffer free */ | |
503 | if (priv->remaining == 0) | |
504 | priv->buffer_free = 1; | |
505 | ||
506 | return count; | |
507 | } | |
508 | ||
c9101c5b MS |
509 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
510 | struct device_attribute *attr, | |
511 | const char * buf, size_t count) | |
512 | { | |
dff59b64 | 513 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
514 | ssize_t ret = count; |
515 | ||
516 | switch (buf[0]) { | |
517 | case '0': | |
518 | priv->autopurge=0; | |
519 | break; | |
520 | case '1': | |
521 | priv->autopurge=1; | |
522 | break; | |
523 | default: | |
524 | ret = -EINVAL; | |
525 | } | |
526 | return ret; | |
527 | } | |
528 | ||
529 | ||
c9101c5b MS |
530 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
531 | struct device_attribute *attr, | |
532 | char *buf) | |
533 | { | |
dff59b64 | 534 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
535 | return sprintf(buf, "%u\n", priv->autopurge); |
536 | } | |
537 | ||
538 | ||
539 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
540 | vmlogrdr_autopurge_store); | |
541 | ||
542 | ||
c9101c5b MS |
543 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
544 | struct device_attribute *attr, | |
545 | const char * buf, size_t count) | |
546 | { | |
1da177e4 LT |
547 | |
548 | char cp_command[80]; | |
549 | char cp_response[80]; | |
dff59b64 | 550 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
551 | |
552 | if (buf[0] != '1') | |
553 | return -EINVAL; | |
554 | ||
555 | memset(cp_command, 0x00, sizeof(cp_command)); | |
556 | memset(cp_response, 0x00, sizeof(cp_response)); | |
557 | ||
558 | /* | |
559 | * The recording command needs to be called with option QID | |
560 | * for guests that have previlege classes A or B. | |
561 | * Other guests will not recognize the command and we have to | |
562 | * issue the same command without the QID parameter. | |
563 | */ | |
564 | ||
565 | if (recording_class_AB) | |
566 | snprintf(cp_command, sizeof(cp_command), | |
567 | "RECORDING %s PURGE QID * ", | |
568 | priv->recording_name); | |
569 | else | |
570 | snprintf(cp_command, sizeof(cp_command), | |
571 | "RECORDING %s PURGE ", | |
572 | priv->recording_name); | |
573 | ||
6b979de3 | 574 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
575 | |
576 | return count; | |
577 | } | |
578 | ||
579 | ||
580 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
581 | ||
582 | ||
c9101c5b MS |
583 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
584 | struct device_attribute *attr, | |
585 | const char *buf, size_t count) | |
586 | { | |
dff59b64 | 587 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
588 | ssize_t ret = count; |
589 | ||
590 | switch (buf[0]) { | |
591 | case '0': | |
592 | priv->autorecording=0; | |
593 | break; | |
594 | case '1': | |
595 | priv->autorecording=1; | |
596 | break; | |
597 | default: | |
598 | ret = -EINVAL; | |
599 | } | |
600 | return ret; | |
601 | } | |
602 | ||
603 | ||
c9101c5b MS |
604 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
605 | struct device_attribute *attr, | |
606 | char *buf) | |
607 | { | |
dff59b64 | 608 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
609 | return sprintf(buf, "%u\n", priv->autorecording); |
610 | } | |
611 | ||
612 | ||
613 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
614 | vmlogrdr_autorecording_store); | |
615 | ||
616 | ||
c9101c5b MS |
617 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
618 | struct device_attribute *attr, | |
619 | const char * buf, size_t count) | |
620 | { | |
dff59b64 | 621 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
622 | ssize_t ret; |
623 | ||
624 | switch (buf[0]) { | |
625 | case '0': | |
626 | ret = vmlogrdr_recording(priv,0,0); | |
627 | break; | |
628 | case '1': | |
629 | ret = vmlogrdr_recording(priv,1,0); | |
630 | break; | |
631 | default: | |
632 | ret = -EINVAL; | |
633 | } | |
634 | if (ret) | |
635 | return ret; | |
636 | else | |
637 | return count; | |
638 | ||
639 | } | |
640 | ||
641 | ||
642 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
643 | ||
644 | ||
36369569 | 645 | static ssize_t recording_status_show(struct device_driver *driver, char *buf) |
c9101c5b | 646 | { |
bf2106ae | 647 | static const char cp_command[] = "QUERY RECORDING "; |
1da177e4 LT |
648 | int len; |
649 | ||
6b979de3 | 650 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
651 | len = strlen(buf); |
652 | return len; | |
653 | } | |
36369569 | 654 | static DRIVER_ATTR_RO(recording_status); |
72f6e3a8 SO |
655 | static struct attribute *vmlogrdr_drv_attrs[] = { |
656 | &driver_attr_recording_status.attr, | |
657 | NULL, | |
658 | }; | |
659 | static struct attribute_group vmlogrdr_drv_attr_group = { | |
660 | .attrs = vmlogrdr_drv_attrs, | |
661 | }; | |
662 | static const struct attribute_group *vmlogrdr_drv_attr_groups[] = { | |
663 | &vmlogrdr_drv_attr_group, | |
664 | NULL, | |
665 | }; | |
1da177e4 LT |
666 | |
667 | static struct attribute *vmlogrdr_attrs[] = { | |
668 | &dev_attr_autopurge.attr, | |
669 | &dev_attr_purge.attr, | |
670 | &dev_attr_autorecording.attr, | |
671 | &dev_attr_recording.attr, | |
672 | NULL, | |
673 | }; | |
76e0377b SO |
674 | static struct attribute_group vmlogrdr_attr_group = { |
675 | .attrs = vmlogrdr_attrs, | |
676 | }; | |
677 | static const struct attribute_group *vmlogrdr_attr_groups[] = { | |
678 | &vmlogrdr_attr_group, | |
679 | NULL, | |
680 | }; | |
1da177e4 | 681 | |
9f62fa16 SW |
682 | static int vmlogrdr_pm_prepare(struct device *dev) |
683 | { | |
684 | int rc; | |
4f0076f7 | 685 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
9f62fa16 SW |
686 | |
687 | rc = 0; | |
688 | if (priv) { | |
689 | spin_lock_bh(&priv->priv_lock); | |
690 | if (priv->dev_in_use) | |
691 | rc = -EBUSY; | |
692 | spin_unlock_bh(&priv->priv_lock); | |
693 | } | |
694 | if (rc) | |
695 | pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n", | |
696 | dev_name(dev)); | |
697 | return rc; | |
698 | } | |
699 | ||
700 | ||
47145210 | 701 | static const struct dev_pm_ops vmlogrdr_pm_ops = { |
9f62fa16 SW |
702 | .prepare = vmlogrdr_pm_prepare, |
703 | }; | |
704 | ||
56b22935 | 705 | static struct class *vmlogrdr_class; |
1da177e4 LT |
706 | static struct device_driver vmlogrdr_driver = { |
707 | .name = "vmlogrdr", | |
708 | .bus = &iucv_bus, | |
9f62fa16 | 709 | .pm = &vmlogrdr_pm_ops, |
72f6e3a8 | 710 | .groups = vmlogrdr_drv_attr_groups, |
1da177e4 LT |
711 | }; |
712 | ||
c9101c5b MS |
713 | static int vmlogrdr_register_driver(void) |
714 | { | |
1da177e4 LT |
715 | int ret; |
716 | ||
c9101c5b MS |
717 | /* Register with iucv driver */ |
718 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
2f6f2521 | 719 | if (ret) |
c9101c5b | 720 | goto out; |
c9101c5b | 721 | |
1da177e4 | 722 | ret = driver_register(&vmlogrdr_driver); |
2f6f2521 | 723 | if (ret) |
c9101c5b | 724 | goto out_iucv; |
1da177e4 | 725 | |
56b22935 | 726 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 | 727 | if (IS_ERR(vmlogrdr_class)) { |
c9101c5b MS |
728 | ret = PTR_ERR(vmlogrdr_class); |
729 | vmlogrdr_class = NULL; | |
72f6e3a8 | 730 | goto out_driver; |
1da177e4 LT |
731 | } |
732 | return 0; | |
733 | ||
c9101c5b | 734 | out_driver: |
1da177e4 | 735 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
736 | out_iucv: |
737 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
738 | out: | |
1da177e4 LT |
739 | return ret; |
740 | } | |
741 | ||
742 | ||
c9101c5b MS |
743 | static void vmlogrdr_unregister_driver(void) |
744 | { | |
56b22935 | 745 | class_destroy(vmlogrdr_class); |
1da177e4 | 746 | vmlogrdr_class = NULL; |
1da177e4 | 747 | driver_unregister(&vmlogrdr_driver); |
c9101c5b | 748 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
749 | } |
750 | ||
751 | ||
c9101c5b MS |
752 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
753 | { | |
1da177e4 LT |
754 | struct device *dev; |
755 | int ret; | |
756 | ||
88abaab4 | 757 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 758 | if (dev) { |
ef283688 | 759 | dev_set_name(dev, "%s", priv->internal_name); |
1da177e4 LT |
760 | dev->bus = &iucv_bus; |
761 | dev->parent = iucv_root; | |
762 | dev->driver = &vmlogrdr_driver; | |
76e0377b | 763 | dev->groups = vmlogrdr_attr_groups; |
4f0076f7 | 764 | dev_set_drvdata(dev, priv); |
1da177e4 LT |
765 | /* |
766 | * The release function could be called after the | |
767 | * module has been unloaded. It's _only_ task is to | |
768 | * free the struct. Therefore, we specify kfree() | |
769 | * directly here. (Probably a little bit obfuscating | |
770 | * but legitime ...). | |
771 | */ | |
772 | dev->release = (void (*)(struct device *))kfree; | |
773 | } else | |
774 | return -ENOMEM; | |
775 | ret = device_register(dev); | |
c6304933 SO |
776 | if (ret) { |
777 | put_device(dev); | |
1da177e4 | 778 | return ret; |
c6304933 | 779 | } |
1da177e4 | 780 | |
ea9e42f6 GKH |
781 | priv->class_device = device_create(vmlogrdr_class, dev, |
782 | MKDEV(vmlogrdr_major, | |
783 | priv->minor_num), | |
784 | priv, "%s", dev_name(dev)); | |
1da177e4 LT |
785 | if (IS_ERR(priv->class_device)) { |
786 | ret = PTR_ERR(priv->class_device); | |
787 | priv->class_device=NULL; | |
1da177e4 LT |
788 | device_unregister(dev); |
789 | return ret; | |
790 | } | |
1da177e4 LT |
791 | priv->device = dev; |
792 | return 0; | |
793 | } | |
794 | ||
795 | ||
c9101c5b MS |
796 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
797 | { | |
7f021ce1 | 798 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 | 799 | if (priv->device != NULL) { |
1da177e4 LT |
800 | device_unregister(priv->device); |
801 | priv->device=NULL; | |
802 | } | |
803 | return 0; | |
804 | } | |
805 | ||
806 | ||
c9101c5b MS |
807 | static int vmlogrdr_register_cdev(dev_t dev) |
808 | { | |
1da177e4 LT |
809 | int rc = 0; |
810 | vmlogrdr_cdev = cdev_alloc(); | |
811 | if (!vmlogrdr_cdev) { | |
812 | return -ENOMEM; | |
813 | } | |
814 | vmlogrdr_cdev->owner = THIS_MODULE; | |
815 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
b08e19de | 816 | rc = cdev_add(vmlogrdr_cdev, dev, MAXMINOR); |
1da177e4 LT |
817 | if (!rc) |
818 | return 0; | |
819 | ||
820 | // cleanup: cdev is not fully registered, no cdev_del here! | |
821 | kobject_put(&vmlogrdr_cdev->kobj); | |
822 | vmlogrdr_cdev=NULL; | |
823 | return rc; | |
824 | } | |
825 | ||
826 | ||
c9101c5b MS |
827 | static void vmlogrdr_cleanup(void) |
828 | { | |
1da177e4 | 829 | int i; |
c9101c5b | 830 | |
1da177e4 LT |
831 | if (vmlogrdr_cdev) { |
832 | cdev_del(vmlogrdr_cdev); | |
833 | vmlogrdr_cdev=NULL; | |
834 | } | |
835 | for (i=0; i < MAXMINOR; ++i ) { | |
836 | vmlogrdr_unregister_device(&sys_ser[i]); | |
837 | free_page((unsigned long)sys_ser[i].buffer); | |
838 | } | |
839 | vmlogrdr_unregister_driver(); | |
840 | if (vmlogrdr_major) { | |
841 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
842 | vmlogrdr_major=0; | |
843 | } | |
844 | } | |
845 | ||
846 | ||
f60d8910 | 847 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
848 | { |
849 | int rc; | |
850 | int i; | |
851 | dev_t dev; | |
852 | ||
853 | if (! MACHINE_IS_VM) { | |
5466c2e4 | 854 | pr_err("not running under VM, driver not loaded.\n"); |
1da177e4 LT |
855 | return -ENODEV; |
856 | } | |
857 | ||
858 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
859 | ||
860 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
861 | if (rc) | |
862 | return rc; | |
863 | vmlogrdr_major = MAJOR(dev); | |
864 | ||
865 | rc=vmlogrdr_register_driver(); | |
866 | if (rc) | |
867 | goto cleanup; | |
868 | ||
869 | for (i=0; i < MAXMINOR; ++i ) { | |
5457e03d | 870 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
1da177e4 | 871 | if (!sys_ser[i].buffer) { |
3cb2cea1 | 872 | rc = -ENOMEM; |
1da177e4 LT |
873 | break; |
874 | } | |
875 | sys_ser[i].current_position = sys_ser[i].buffer; | |
876 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
877 | if (rc) | |
878 | break; | |
879 | } | |
880 | if (rc) | |
881 | goto cleanup; | |
882 | ||
883 | rc = vmlogrdr_register_cdev(dev); | |
884 | if (rc) | |
885 | goto cleanup; | |
1da177e4 LT |
886 | return 0; |
887 | ||
888 | cleanup: | |
889 | vmlogrdr_cleanup(); | |
1da177e4 LT |
890 | return rc; |
891 | } | |
892 | ||
893 | ||
f60d8910 | 894 | static void __exit vmlogrdr_exit(void) |
1da177e4 LT |
895 | { |
896 | vmlogrdr_cleanup(); | |
1da177e4 LT |
897 | return; |
898 | } | |
899 | ||
900 | ||
901 | module_init(vmlogrdr_init); | |
902 | module_exit(vmlogrdr_exit); |