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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * character device driver for reading z/VM system service records |
3 | * | |
4 | * | |
9f62fa16 | 5 | * Copyright IBM Corp. 2004, 2009 |
1da177e4 LT |
6 | * character device driver for reading z/VM system service records, |
7 | * Version 1.0 | |
8 | * Author(s): Xenia Tkatschow <xenia@us.ibm.com> | |
9 | * Stefan Weinhuber <wein@de.ibm.com> | |
10 | * | |
11 | */ | |
5466c2e4 MS |
12 | |
13 | #define KMSG_COMPONENT "vmlogrdr" | |
14 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
15 | ||
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/errno.h> |
20 | #include <linux/types.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/spinlock.h> | |
60063497 | 23 | #include <linux/atomic.h> |
7c0f6ba6 | 24 | #include <linux/uaccess.h> |
1da177e4 LT |
25 | #include <asm/cpcmd.h> |
26 | #include <asm/debug.h> | |
27 | #include <asm/ebcdic.h> | |
c9101c5b | 28 | #include <net/iucv/iucv.h> |
1da177e4 LT |
29 | #include <linux/kmod.h> |
30 | #include <linux/cdev.h> | |
31 | #include <linux/device.h> | |
32 | #include <linux/string.h> | |
33 | ||
1da177e4 LT |
34 | MODULE_AUTHOR |
35 | ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n" | |
36 | " Stefan Weinhuber (wein@de.ibm.com)"); | |
37 | MODULE_DESCRIPTION ("Character device driver for reading z/VM " | |
38 | "system service records."); | |
39 | MODULE_LICENSE("GPL"); | |
40 | ||
41 | ||
42 | /* | |
43 | * The size of the buffer for iucv data transfer is one page, | |
44 | * but in addition to the data we read from iucv we also | |
45 | * place an integer and some characters into that buffer, | |
46 | * so the maximum size for record data is a little less then | |
47 | * one page. | |
48 | */ | |
49 | #define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE)) | |
50 | ||
51 | /* | |
52 | * The elements that are concurrently accessed by bottom halves are | |
53 | * connection_established, iucv_path_severed, local_interrupt_buffer | |
54 | * and receive_ready. The first three can be protected by | |
55 | * priv_lock. receive_ready is atomic, so it can be incremented and | |
56 | * decremented without holding a lock. | |
57 | * The variable dev_in_use needs to be protected by the lock, since | |
58 | * it's a flag used by open to make sure that the device is opened only | |
59 | * by one user at the same time. | |
60 | */ | |
61 | struct vmlogrdr_priv_t { | |
62 | char system_service[8]; | |
63 | char internal_name[8]; | |
64 | char recording_name[8]; | |
c9101c5b | 65 | struct iucv_path *path; |
1da177e4 LT |
66 | int connection_established; |
67 | int iucv_path_severed; | |
c9101c5b | 68 | struct iucv_message local_interrupt_buffer; |
1da177e4 | 69 | atomic_t receive_ready; |
1da177e4 LT |
70 | int minor_num; |
71 | char * buffer; | |
72 | char * current_position; | |
73 | int remaining; | |
74 | ulong residual_length; | |
75 | int buffer_free; | |
76 | int dev_in_use; /* 1: already opened, 0: not opened*/ | |
77 | spinlock_t priv_lock; | |
78 | struct device *device; | |
7f021ce1 | 79 | struct device *class_device; |
1da177e4 LT |
80 | int autorecording; |
81 | int autopurge; | |
82 | }; | |
83 | ||
84 | ||
85 | /* | |
86 | * File operation structure for vmlogrdr devices | |
87 | */ | |
88 | static int vmlogrdr_open(struct inode *, struct file *); | |
89 | static int vmlogrdr_release(struct inode *, struct file *); | |
d2c993d8 HC |
90 | static ssize_t vmlogrdr_read (struct file *filp, char __user *data, |
91 | size_t count, loff_t * ppos); | |
1da177e4 | 92 | |
d54b1fdb | 93 | static const struct file_operations vmlogrdr_fops = { |
1da177e4 LT |
94 | .owner = THIS_MODULE, |
95 | .open = vmlogrdr_open, | |
96 | .release = vmlogrdr_release, | |
97 | .read = vmlogrdr_read, | |
6038f373 | 98 | .llseek = no_llseek, |
1da177e4 LT |
99 | }; |
100 | ||
101 | ||
91e60eb6 UB |
102 | static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 *ipuser); |
103 | static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 *ipuser); | |
c9101c5b MS |
104 | static void vmlogrdr_iucv_message_pending(struct iucv_path *, |
105 | struct iucv_message *); | |
1da177e4 LT |
106 | |
107 | ||
c9101c5b MS |
108 | static struct iucv_handler vmlogrdr_iucv_handler = { |
109 | .path_complete = vmlogrdr_iucv_path_complete, | |
110 | .path_severed = vmlogrdr_iucv_path_severed, | |
111 | .message_pending = vmlogrdr_iucv_message_pending, | |
1da177e4 LT |
112 | }; |
113 | ||
114 | ||
2b67fc46 HC |
115 | static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); |
116 | static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); | |
1da177e4 LT |
117 | |
118 | /* | |
119 | * pointer to system service private structure | |
120 | * minor number 0 --> logrec | |
121 | * minor number 1 --> account | |
122 | * minor number 2 --> symptom | |
123 | */ | |
124 | ||
125 | static struct vmlogrdr_priv_t sys_ser[] = { | |
126 | { .system_service = "*LOGREC ", | |
127 | .internal_name = "logrec", | |
128 | .recording_name = "EREP", | |
129 | .minor_num = 0, | |
130 | .buffer_free = 1, | |
cb629a01 | 131 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), |
1da177e4 LT |
132 | .autorecording = 1, |
133 | .autopurge = 1, | |
134 | }, | |
135 | { .system_service = "*ACCOUNT", | |
136 | .internal_name = "account", | |
137 | .recording_name = "ACCOUNT", | |
138 | .minor_num = 1, | |
139 | .buffer_free = 1, | |
cb629a01 | 140 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), |
1da177e4 LT |
141 | .autorecording = 1, |
142 | .autopurge = 1, | |
143 | }, | |
144 | { .system_service = "*SYMPTOM", | |
145 | .internal_name = "symptom", | |
146 | .recording_name = "SYMPTOM", | |
147 | .minor_num = 2, | |
148 | .buffer_free = 1, | |
cb629a01 | 149 | .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), |
1da177e4 LT |
150 | .autorecording = 1, |
151 | .autopurge = 1, | |
152 | } | |
153 | }; | |
154 | ||
155 | #define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) | |
156 | ||
157 | static char FENCE[] = {"EOR"}; | |
158 | static int vmlogrdr_major = 0; | |
159 | static struct cdev *vmlogrdr_cdev = NULL; | |
160 | static int recording_class_AB; | |
161 | ||
162 | ||
91e60eb6 | 163 | static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 *ipuser) |
1da177e4 | 164 | { |
c9101c5b MS |
165 | struct vmlogrdr_priv_t * logptr = path->private; |
166 | ||
1da177e4 LT |
167 | spin_lock(&logptr->priv_lock); |
168 | logptr->connection_established = 1; | |
169 | spin_unlock(&logptr->priv_lock); | |
170 | wake_up(&conn_wait_queue); | |
1da177e4 LT |
171 | } |
172 | ||
173 | ||
91e60eb6 | 174 | static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 *ipuser) |
1da177e4 | 175 | { |
c9101c5b MS |
176 | struct vmlogrdr_priv_t * logptr = path->private; |
177 | u8 reason = (u8) ipuser[8]; | |
1da177e4 | 178 | |
5466c2e4 | 179 | pr_err("vmlogrdr: connection severed with reason %i\n", reason); |
1da177e4 | 180 | |
c9101c5b MS |
181 | iucv_path_sever(path, NULL); |
182 | kfree(path); | |
183 | logptr->path = NULL; | |
184 | ||
1da177e4 LT |
185 | spin_lock(&logptr->priv_lock); |
186 | logptr->connection_established = 0; | |
187 | logptr->iucv_path_severed = 1; | |
188 | spin_unlock(&logptr->priv_lock); | |
189 | ||
190 | wake_up(&conn_wait_queue); | |
191 | /* just in case we're sleeping waiting for a record */ | |
192 | wake_up_interruptible(&read_wait_queue); | |
193 | } | |
194 | ||
195 | ||
c9101c5b MS |
196 | static void vmlogrdr_iucv_message_pending(struct iucv_path *path, |
197 | struct iucv_message *msg) | |
1da177e4 | 198 | { |
c9101c5b | 199 | struct vmlogrdr_priv_t * logptr = path->private; |
1da177e4 LT |
200 | |
201 | /* | |
202 | * This function is the bottom half so it should be quick. | |
203 | * Copy the external interrupt data into our local eib and increment | |
204 | * the usage count | |
205 | */ | |
206 | spin_lock(&logptr->priv_lock); | |
c9101c5b | 207 | memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); |
1da177e4 LT |
208 | atomic_inc(&logptr->receive_ready); |
209 | spin_unlock(&logptr->priv_lock); | |
210 | wake_up_interruptible(&read_wait_queue); | |
211 | } | |
212 | ||
213 | ||
c9101c5b MS |
214 | static int vmlogrdr_get_recording_class_AB(void) |
215 | { | |
bf2106ae | 216 | static const char cp_command[] = "QUERY COMMAND RECORDING "; |
1da177e4 LT |
217 | char cp_response[80]; |
218 | char *tail; | |
219 | int len,i; | |
220 | ||
6b979de3 | 221 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
222 | len = strnlen(cp_response,sizeof(cp_response)); |
223 | // now the parsing | |
224 | tail=strnchr(cp_response,len,'='); | |
225 | if (!tail) | |
226 | return 0; | |
227 | tail++; | |
228 | if (!strncmp("ANY",tail,3)) | |
229 | return 1; | |
230 | if (!strncmp("NONE",tail,4)) | |
231 | return 0; | |
232 | /* | |
233 | * expect comma separated list of classes here, if one of them | |
234 | * is A or B return 1 otherwise 0 | |
235 | */ | |
236 | for (i=tail-cp_response; i<len; i++) | |
237 | if ( cp_response[i]=='A' || cp_response[i]=='B' ) | |
238 | return 1; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | ||
c9101c5b MS |
243 | static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, |
244 | int action, int purge) | |
245 | { | |
1da177e4 LT |
246 | |
247 | char cp_command[80]; | |
248 | char cp_response[160]; | |
249 | char *onoff, *qid_string; | |
ca768b66 | 250 | int rc; |
1da177e4 | 251 | |
ca768b66 | 252 | onoff = ((action == 1) ? "ON" : "OFF"); |
1da177e4 LT |
253 | qid_string = ((recording_class_AB == 1) ? " QID * " : ""); |
254 | ||
ca768b66 | 255 | /* |
1da177e4 LT |
256 | * The recording commands needs to be called with option QID |
257 | * for guests that have previlege classes A or B. | |
258 | * Purging has to be done as separate step, because recording | |
259 | * can't be switched on as long as records are on the queue. | |
260 | * Doing both at the same time doesn't work. | |
261 | */ | |
ca768b66 SW |
262 | if (purge && (action == 1)) { |
263 | memset(cp_command, 0x00, sizeof(cp_command)); | |
264 | memset(cp_response, 0x00, sizeof(cp_response)); | |
1da177e4 LT |
265 | snprintf(cp_command, sizeof(cp_command), |
266 | "RECORDING %s PURGE %s", | |
267 | logptr->recording_name, | |
268 | qid_string); | |
6b979de3 | 269 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
270 | } |
271 | ||
272 | memset(cp_command, 0x00, sizeof(cp_command)); | |
273 | memset(cp_response, 0x00, sizeof(cp_response)); | |
274 | snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", | |
275 | logptr->recording_name, | |
276 | onoff, | |
277 | qid_string); | |
6b979de3 | 278 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
279 | /* The recording command will usually answer with 'Command complete' |
280 | * on success, but when the specific service was never connected | |
281 | * before then there might be an additional informational message | |
282 | * 'HCPCRC8072I Recording entry not found' before the | |
ca768b66 | 283 | * 'Command complete'. So I use strstr rather then the strncmp. |
1da177e4 LT |
284 | */ |
285 | if (strstr(cp_response,"Command complete")) | |
ca768b66 | 286 | rc = 0; |
1da177e4 | 287 | else |
ca768b66 SW |
288 | rc = -EIO; |
289 | /* | |
290 | * If we turn recording off, we have to purge any remaining records | |
291 | * afterwards, as a large number of queued records may impact z/VM | |
292 | * performance. | |
293 | */ | |
294 | if (purge && (action == 0)) { | |
295 | memset(cp_command, 0x00, sizeof(cp_command)); | |
296 | memset(cp_response, 0x00, sizeof(cp_response)); | |
297 | snprintf(cp_command, sizeof(cp_command), | |
298 | "RECORDING %s PURGE %s", | |
299 | logptr->recording_name, | |
300 | qid_string); | |
301 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); | |
302 | } | |
1da177e4 | 303 | |
ca768b66 | 304 | return rc; |
1da177e4 LT |
305 | } |
306 | ||
307 | ||
c9101c5b | 308 | static int vmlogrdr_open (struct inode *inode, struct file *filp) |
1da177e4 LT |
309 | { |
310 | int dev_num = 0; | |
311 | struct vmlogrdr_priv_t * logptr = NULL; | |
312 | int connect_rc = 0; | |
313 | int ret; | |
314 | ||
315 | dev_num = iminor(inode); | |
9784bd4f | 316 | if (dev_num >= MAXMINOR) |
1da177e4 | 317 | return -ENODEV; |
1da177e4 | 318 | logptr = &sys_ser[dev_num]; |
1da177e4 LT |
319 | |
320 | /* | |
321 | * only allow for blocking reads to be open | |
322 | */ | |
323 | if (filp->f_flags & O_NONBLOCK) | |
745e967a | 324 | return -EOPNOTSUPP; |
1da177e4 LT |
325 | |
326 | /* Besure this device hasn't already been opened */ | |
327 | spin_lock_bh(&logptr->priv_lock); | |
328 | if (logptr->dev_in_use) { | |
329 | spin_unlock_bh(&logptr->priv_lock); | |
330 | return -EBUSY; | |
1da177e4 | 331 | } |
c9101c5b MS |
332 | logptr->dev_in_use = 1; |
333 | logptr->connection_established = 0; | |
334 | logptr->iucv_path_severed = 0; | |
1da177e4 LT |
335 | atomic_set(&logptr->receive_ready, 0); |
336 | logptr->buffer_free = 1; | |
c9101c5b | 337 | spin_unlock_bh(&logptr->priv_lock); |
1da177e4 LT |
338 | |
339 | /* set the file options */ | |
340 | filp->private_data = logptr; | |
1da177e4 LT |
341 | |
342 | /* start recording for this service*/ | |
c9101c5b | 343 | if (logptr->autorecording) { |
1da177e4 | 344 | ret = vmlogrdr_recording(logptr,1,logptr->autopurge); |
c9101c5b | 345 | if (ret) |
baebc70a | 346 | pr_warn("vmlogrdr: failed to start recording automatically\n"); |
1da177e4 LT |
347 | } |
348 | ||
349 | /* create connection to the system service */ | |
c9101c5b MS |
350 | logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL); |
351 | if (!logptr->path) | |
352 | goto out_dev; | |
353 | connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler, | |
354 | logptr->system_service, NULL, NULL, | |
355 | logptr); | |
1da177e4 | 356 | if (connect_rc) { |
5466c2e4 MS |
357 | pr_err("vmlogrdr: iucv connection to %s " |
358 | "failed with rc %i \n", | |
359 | logptr->system_service, connect_rc); | |
c9101c5b | 360 | goto out_path; |
1da177e4 LT |
361 | } |
362 | ||
363 | /* We've issued the connect and now we must wait for a | |
364 | * ConnectionComplete or ConnectinSevered Interrupt | |
365 | * before we can continue to process. | |
366 | */ | |
367 | wait_event(conn_wait_queue, (logptr->connection_established) | |
368 | || (logptr->iucv_path_severed)); | |
c9101c5b MS |
369 | if (logptr->iucv_path_severed) |
370 | goto out_record; | |
3b47f9d5 MS |
371 | nonseekable_open(inode, filp); |
372 | return 0; | |
1da177e4 | 373 | |
c9101c5b | 374 | out_record: |
1da177e4 LT |
375 | if (logptr->autorecording) |
376 | vmlogrdr_recording(logptr,0,logptr->autopurge); | |
c9101c5b MS |
377 | out_path: |
378 | kfree(logptr->path); /* kfree(NULL) is ok. */ | |
379 | logptr->path = NULL; | |
380 | out_dev: | |
1da177e4 LT |
381 | logptr->dev_in_use = 0; |
382 | return -EIO; | |
1da177e4 LT |
383 | } |
384 | ||
385 | ||
c9101c5b | 386 | static int vmlogrdr_release (struct inode *inode, struct file *filp) |
1da177e4 LT |
387 | { |
388 | int ret; | |
389 | ||
390 | struct vmlogrdr_priv_t * logptr = filp->private_data; | |
391 | ||
66b494a7 UB |
392 | iucv_path_sever(logptr->path, NULL); |
393 | kfree(logptr->path); | |
394 | logptr->path = NULL; | |
1da177e4 LT |
395 | if (logptr->autorecording) { |
396 | ret = vmlogrdr_recording(logptr,0,logptr->autopurge); | |
397 | if (ret) | |
baebc70a | 398 | pr_warn("vmlogrdr: failed to stop recording automatically\n"); |
1da177e4 LT |
399 | } |
400 | logptr->dev_in_use = 0; | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | ||
c9101c5b MS |
406 | static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) |
407 | { | |
1da177e4 LT |
408 | int rc, *temp; |
409 | /* we need to keep track of two data sizes here: | |
410 | * The number of bytes we need to receive from iucv and | |
411 | * the total number of bytes we actually write into the buffer. | |
412 | */ | |
413 | int user_data_count, iucv_data_count; | |
414 | char * buffer; | |
415 | ||
416 | if (atomic_read(&priv->receive_ready)) { | |
417 | spin_lock_bh(&priv->priv_lock); | |
418 | if (priv->residual_length){ | |
419 | /* receive second half of a record */ | |
420 | iucv_data_count = priv->residual_length; | |
421 | user_data_count = 0; | |
422 | buffer = priv->buffer; | |
423 | } else { | |
424 | /* receive a new record: | |
425 | * We need to return the total length of the record | |
426 | * + size of FENCE in the first 4 bytes of the buffer. | |
427 | */ | |
c9101c5b | 428 | iucv_data_count = priv->local_interrupt_buffer.length; |
1da177e4 LT |
429 | user_data_count = sizeof(int); |
430 | temp = (int*)priv->buffer; | |
431 | *temp= iucv_data_count + sizeof(FENCE); | |
432 | buffer = priv->buffer + sizeof(int); | |
433 | } | |
434 | /* | |
025dfdaf | 435 | * If the record is bigger than our buffer, we receive only |
1da177e4 LT |
436 | * a part of it. We can get the rest later. |
437 | */ | |
438 | if (iucv_data_count > NET_BUFFER_SIZE) | |
439 | iucv_data_count = NET_BUFFER_SIZE; | |
c9101c5b MS |
440 | rc = iucv_message_receive(priv->path, |
441 | &priv->local_interrupt_buffer, | |
442 | 0, buffer, iucv_data_count, | |
443 | &priv->residual_length); | |
1da177e4 | 444 | spin_unlock_bh(&priv->priv_lock); |
025dfdaf | 445 | /* An rc of 5 indicates that the record was bigger than |
1da177e4 LT |
446 | * the buffer, which is OK for us. A 9 indicates that the |
447 | * record was purged befor we could receive it. | |
448 | */ | |
449 | if (rc == 5) | |
450 | rc = 0; | |
451 | if (rc == 9) | |
452 | atomic_set(&priv->receive_ready, 0); | |
453 | } else { | |
454 | rc = 1; | |
455 | } | |
456 | if (!rc) { | |
457 | priv->buffer_free = 0; | |
458 | user_data_count += iucv_data_count; | |
459 | priv->current_position = priv->buffer; | |
460 | if (priv->residual_length == 0){ | |
461 | /* the whole record has been captured, | |
462 | * now add the fence */ | |
463 | atomic_dec(&priv->receive_ready); | |
464 | buffer = priv->buffer + user_data_count; | |
465 | memcpy(buffer, FENCE, sizeof(FENCE)); | |
466 | user_data_count += sizeof(FENCE); | |
467 | } | |
468 | priv->remaining = user_data_count; | |
469 | } | |
470 | ||
471 | return rc; | |
472 | } | |
473 | ||
474 | ||
c9101c5b MS |
475 | static ssize_t vmlogrdr_read(struct file *filp, char __user *data, |
476 | size_t count, loff_t * ppos) | |
1da177e4 LT |
477 | { |
478 | int rc; | |
479 | struct vmlogrdr_priv_t * priv = filp->private_data; | |
480 | ||
481 | while (priv->buffer_free) { | |
482 | rc = vmlogrdr_receive_data(priv); | |
483 | if (rc) { | |
484 | rc = wait_event_interruptible(read_wait_queue, | |
485 | atomic_read(&priv->receive_ready)); | |
486 | if (rc) | |
487 | return rc; | |
488 | } | |
489 | } | |
490 | /* copy only up to end of record */ | |
491 | if (count > priv->remaining) | |
492 | count = priv->remaining; | |
493 | ||
494 | if (copy_to_user(data, priv->current_position, count)) | |
495 | return -EFAULT; | |
496 | ||
497 | *ppos += count; | |
498 | priv->current_position += count; | |
499 | priv->remaining -= count; | |
500 | ||
501 | /* if all data has been transferred, set buffer free */ | |
502 | if (priv->remaining == 0) | |
503 | priv->buffer_free = 1; | |
504 | ||
505 | return count; | |
506 | } | |
507 | ||
c9101c5b MS |
508 | static ssize_t vmlogrdr_autopurge_store(struct device * dev, |
509 | struct device_attribute *attr, | |
510 | const char * buf, size_t count) | |
511 | { | |
dff59b64 | 512 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
513 | ssize_t ret = count; |
514 | ||
515 | switch (buf[0]) { | |
516 | case '0': | |
517 | priv->autopurge=0; | |
518 | break; | |
519 | case '1': | |
520 | priv->autopurge=1; | |
521 | break; | |
522 | default: | |
523 | ret = -EINVAL; | |
524 | } | |
525 | return ret; | |
526 | } | |
527 | ||
528 | ||
c9101c5b MS |
529 | static ssize_t vmlogrdr_autopurge_show(struct device *dev, |
530 | struct device_attribute *attr, | |
531 | char *buf) | |
532 | { | |
dff59b64 | 533 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
534 | return sprintf(buf, "%u\n", priv->autopurge); |
535 | } | |
536 | ||
537 | ||
538 | static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, | |
539 | vmlogrdr_autopurge_store); | |
540 | ||
541 | ||
c9101c5b MS |
542 | static ssize_t vmlogrdr_purge_store(struct device * dev, |
543 | struct device_attribute *attr, | |
544 | const char * buf, size_t count) | |
545 | { | |
1da177e4 LT |
546 | |
547 | char cp_command[80]; | |
548 | char cp_response[80]; | |
dff59b64 | 549 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
550 | |
551 | if (buf[0] != '1') | |
552 | return -EINVAL; | |
553 | ||
554 | memset(cp_command, 0x00, sizeof(cp_command)); | |
555 | memset(cp_response, 0x00, sizeof(cp_response)); | |
556 | ||
557 | /* | |
558 | * The recording command needs to be called with option QID | |
559 | * for guests that have previlege classes A or B. | |
560 | * Other guests will not recognize the command and we have to | |
561 | * issue the same command without the QID parameter. | |
562 | */ | |
563 | ||
564 | if (recording_class_AB) | |
565 | snprintf(cp_command, sizeof(cp_command), | |
566 | "RECORDING %s PURGE QID * ", | |
567 | priv->recording_name); | |
568 | else | |
569 | snprintf(cp_command, sizeof(cp_command), | |
570 | "RECORDING %s PURGE ", | |
571 | priv->recording_name); | |
572 | ||
6b979de3 | 573 | cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); |
1da177e4 LT |
574 | |
575 | return count; | |
576 | } | |
577 | ||
578 | ||
579 | static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); | |
580 | ||
581 | ||
c9101c5b MS |
582 | static ssize_t vmlogrdr_autorecording_store(struct device *dev, |
583 | struct device_attribute *attr, | |
584 | const char *buf, size_t count) | |
585 | { | |
dff59b64 | 586 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
587 | ssize_t ret = count; |
588 | ||
589 | switch (buf[0]) { | |
590 | case '0': | |
591 | priv->autorecording=0; | |
592 | break; | |
593 | case '1': | |
594 | priv->autorecording=1; | |
595 | break; | |
596 | default: | |
597 | ret = -EINVAL; | |
598 | } | |
599 | return ret; | |
600 | } | |
601 | ||
602 | ||
c9101c5b MS |
603 | static ssize_t vmlogrdr_autorecording_show(struct device *dev, |
604 | struct device_attribute *attr, | |
605 | char *buf) | |
606 | { | |
dff59b64 | 607 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
608 | return sprintf(buf, "%u\n", priv->autorecording); |
609 | } | |
610 | ||
611 | ||
612 | static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, | |
613 | vmlogrdr_autorecording_store); | |
614 | ||
615 | ||
c9101c5b MS |
616 | static ssize_t vmlogrdr_recording_store(struct device * dev, |
617 | struct device_attribute *attr, | |
618 | const char * buf, size_t count) | |
619 | { | |
dff59b64 | 620 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
1da177e4 LT |
621 | ssize_t ret; |
622 | ||
623 | switch (buf[0]) { | |
624 | case '0': | |
625 | ret = vmlogrdr_recording(priv,0,0); | |
626 | break; | |
627 | case '1': | |
628 | ret = vmlogrdr_recording(priv,1,0); | |
629 | break; | |
630 | default: | |
631 | ret = -EINVAL; | |
632 | } | |
633 | if (ret) | |
634 | return ret; | |
635 | else | |
636 | return count; | |
637 | ||
638 | } | |
639 | ||
640 | ||
641 | static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); | |
642 | ||
643 | ||
c9101c5b MS |
644 | static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver, |
645 | char *buf) | |
646 | { | |
1da177e4 | 647 | |
bf2106ae | 648 | static const char cp_command[] = "QUERY RECORDING "; |
1da177e4 LT |
649 | int len; |
650 | ||
6b979de3 | 651 | cpcmd(cp_command, buf, 4096, NULL); |
1da177e4 LT |
652 | len = strlen(buf); |
653 | return len; | |
654 | } | |
1da177e4 LT |
655 | static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show, |
656 | NULL); | |
72f6e3a8 SO |
657 | static struct attribute *vmlogrdr_drv_attrs[] = { |
658 | &driver_attr_recording_status.attr, | |
659 | NULL, | |
660 | }; | |
661 | static struct attribute_group vmlogrdr_drv_attr_group = { | |
662 | .attrs = vmlogrdr_drv_attrs, | |
663 | }; | |
664 | static const struct attribute_group *vmlogrdr_drv_attr_groups[] = { | |
665 | &vmlogrdr_drv_attr_group, | |
666 | NULL, | |
667 | }; | |
1da177e4 LT |
668 | |
669 | static struct attribute *vmlogrdr_attrs[] = { | |
670 | &dev_attr_autopurge.attr, | |
671 | &dev_attr_purge.attr, | |
672 | &dev_attr_autorecording.attr, | |
673 | &dev_attr_recording.attr, | |
674 | NULL, | |
675 | }; | |
76e0377b SO |
676 | static struct attribute_group vmlogrdr_attr_group = { |
677 | .attrs = vmlogrdr_attrs, | |
678 | }; | |
679 | static const struct attribute_group *vmlogrdr_attr_groups[] = { | |
680 | &vmlogrdr_attr_group, | |
681 | NULL, | |
682 | }; | |
1da177e4 | 683 | |
9f62fa16 SW |
684 | static int vmlogrdr_pm_prepare(struct device *dev) |
685 | { | |
686 | int rc; | |
4f0076f7 | 687 | struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); |
9f62fa16 SW |
688 | |
689 | rc = 0; | |
690 | if (priv) { | |
691 | spin_lock_bh(&priv->priv_lock); | |
692 | if (priv->dev_in_use) | |
693 | rc = -EBUSY; | |
694 | spin_unlock_bh(&priv->priv_lock); | |
695 | } | |
696 | if (rc) | |
697 | pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n", | |
698 | dev_name(dev)); | |
699 | return rc; | |
700 | } | |
701 | ||
702 | ||
47145210 | 703 | static const struct dev_pm_ops vmlogrdr_pm_ops = { |
9f62fa16 SW |
704 | .prepare = vmlogrdr_pm_prepare, |
705 | }; | |
706 | ||
56b22935 | 707 | static struct class *vmlogrdr_class; |
1da177e4 LT |
708 | static struct device_driver vmlogrdr_driver = { |
709 | .name = "vmlogrdr", | |
710 | .bus = &iucv_bus, | |
9f62fa16 | 711 | .pm = &vmlogrdr_pm_ops, |
72f6e3a8 | 712 | .groups = vmlogrdr_drv_attr_groups, |
1da177e4 LT |
713 | }; |
714 | ||
c9101c5b MS |
715 | static int vmlogrdr_register_driver(void) |
716 | { | |
1da177e4 LT |
717 | int ret; |
718 | ||
c9101c5b MS |
719 | /* Register with iucv driver */ |
720 | ret = iucv_register(&vmlogrdr_iucv_handler, 1); | |
2f6f2521 | 721 | if (ret) |
c9101c5b | 722 | goto out; |
c9101c5b | 723 | |
1da177e4 | 724 | ret = driver_register(&vmlogrdr_driver); |
2f6f2521 | 725 | if (ret) |
c9101c5b | 726 | goto out_iucv; |
1da177e4 | 727 | |
56b22935 | 728 | vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); |
1da177e4 | 729 | if (IS_ERR(vmlogrdr_class)) { |
c9101c5b MS |
730 | ret = PTR_ERR(vmlogrdr_class); |
731 | vmlogrdr_class = NULL; | |
72f6e3a8 | 732 | goto out_driver; |
1da177e4 LT |
733 | } |
734 | return 0; | |
735 | ||
c9101c5b | 736 | out_driver: |
1da177e4 | 737 | driver_unregister(&vmlogrdr_driver); |
c9101c5b MS |
738 | out_iucv: |
739 | iucv_unregister(&vmlogrdr_iucv_handler, 1); | |
740 | out: | |
1da177e4 LT |
741 | return ret; |
742 | } | |
743 | ||
744 | ||
c9101c5b MS |
745 | static void vmlogrdr_unregister_driver(void) |
746 | { | |
56b22935 | 747 | class_destroy(vmlogrdr_class); |
1da177e4 | 748 | vmlogrdr_class = NULL; |
1da177e4 | 749 | driver_unregister(&vmlogrdr_driver); |
c9101c5b | 750 | iucv_unregister(&vmlogrdr_iucv_handler, 1); |
1da177e4 LT |
751 | } |
752 | ||
753 | ||
c9101c5b MS |
754 | static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) |
755 | { | |
1da177e4 LT |
756 | struct device *dev; |
757 | int ret; | |
758 | ||
88abaab4 | 759 | dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
1da177e4 | 760 | if (dev) { |
ef283688 | 761 | dev_set_name(dev, "%s", priv->internal_name); |
1da177e4 LT |
762 | dev->bus = &iucv_bus; |
763 | dev->parent = iucv_root; | |
764 | dev->driver = &vmlogrdr_driver; | |
76e0377b | 765 | dev->groups = vmlogrdr_attr_groups; |
4f0076f7 | 766 | dev_set_drvdata(dev, priv); |
1da177e4 LT |
767 | /* |
768 | * The release function could be called after the | |
769 | * module has been unloaded. It's _only_ task is to | |
770 | * free the struct. Therefore, we specify kfree() | |
771 | * directly here. (Probably a little bit obfuscating | |
772 | * but legitime ...). | |
773 | */ | |
774 | dev->release = (void (*)(struct device *))kfree; | |
775 | } else | |
776 | return -ENOMEM; | |
777 | ret = device_register(dev); | |
c6304933 SO |
778 | if (ret) { |
779 | put_device(dev); | |
1da177e4 | 780 | return ret; |
c6304933 | 781 | } |
1da177e4 | 782 | |
ea9e42f6 GKH |
783 | priv->class_device = device_create(vmlogrdr_class, dev, |
784 | MKDEV(vmlogrdr_major, | |
785 | priv->minor_num), | |
786 | priv, "%s", dev_name(dev)); | |
1da177e4 LT |
787 | if (IS_ERR(priv->class_device)) { |
788 | ret = PTR_ERR(priv->class_device); | |
789 | priv->class_device=NULL; | |
1da177e4 LT |
790 | device_unregister(dev); |
791 | return ret; | |
792 | } | |
1da177e4 LT |
793 | priv->device = dev; |
794 | return 0; | |
795 | } | |
796 | ||
797 | ||
c9101c5b MS |
798 | static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) |
799 | { | |
7f021ce1 | 800 | device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); |
1da177e4 | 801 | if (priv->device != NULL) { |
1da177e4 LT |
802 | device_unregister(priv->device); |
803 | priv->device=NULL; | |
804 | } | |
805 | return 0; | |
806 | } | |
807 | ||
808 | ||
c9101c5b MS |
809 | static int vmlogrdr_register_cdev(dev_t dev) |
810 | { | |
1da177e4 LT |
811 | int rc = 0; |
812 | vmlogrdr_cdev = cdev_alloc(); | |
813 | if (!vmlogrdr_cdev) { | |
814 | return -ENOMEM; | |
815 | } | |
816 | vmlogrdr_cdev->owner = THIS_MODULE; | |
817 | vmlogrdr_cdev->ops = &vmlogrdr_fops; | |
818 | vmlogrdr_cdev->dev = dev; | |
819 | rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR); | |
820 | if (!rc) | |
821 | return 0; | |
822 | ||
823 | // cleanup: cdev is not fully registered, no cdev_del here! | |
824 | kobject_put(&vmlogrdr_cdev->kobj); | |
825 | vmlogrdr_cdev=NULL; | |
826 | return rc; | |
827 | } | |
828 | ||
829 | ||
c9101c5b MS |
830 | static void vmlogrdr_cleanup(void) |
831 | { | |
1da177e4 | 832 | int i; |
c9101c5b | 833 | |
1da177e4 LT |
834 | if (vmlogrdr_cdev) { |
835 | cdev_del(vmlogrdr_cdev); | |
836 | vmlogrdr_cdev=NULL; | |
837 | } | |
838 | for (i=0; i < MAXMINOR; ++i ) { | |
839 | vmlogrdr_unregister_device(&sys_ser[i]); | |
840 | free_page((unsigned long)sys_ser[i].buffer); | |
841 | } | |
842 | vmlogrdr_unregister_driver(); | |
843 | if (vmlogrdr_major) { | |
844 | unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); | |
845 | vmlogrdr_major=0; | |
846 | } | |
847 | } | |
848 | ||
849 | ||
f60d8910 | 850 | static int __init vmlogrdr_init(void) |
1da177e4 LT |
851 | { |
852 | int rc; | |
853 | int i; | |
854 | dev_t dev; | |
855 | ||
856 | if (! MACHINE_IS_VM) { | |
5466c2e4 | 857 | pr_err("not running under VM, driver not loaded.\n"); |
1da177e4 LT |
858 | return -ENODEV; |
859 | } | |
860 | ||
861 | recording_class_AB = vmlogrdr_get_recording_class_AB(); | |
862 | ||
863 | rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); | |
864 | if (rc) | |
865 | return rc; | |
866 | vmlogrdr_major = MAJOR(dev); | |
867 | ||
868 | rc=vmlogrdr_register_driver(); | |
869 | if (rc) | |
870 | goto cleanup; | |
871 | ||
872 | for (i=0; i < MAXMINOR; ++i ) { | |
5457e03d | 873 | sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
1da177e4 | 874 | if (!sys_ser[i].buffer) { |
3cb2cea1 | 875 | rc = -ENOMEM; |
1da177e4 LT |
876 | break; |
877 | } | |
878 | sys_ser[i].current_position = sys_ser[i].buffer; | |
879 | rc=vmlogrdr_register_device(&sys_ser[i]); | |
880 | if (rc) | |
881 | break; | |
882 | } | |
883 | if (rc) | |
884 | goto cleanup; | |
885 | ||
886 | rc = vmlogrdr_register_cdev(dev); | |
887 | if (rc) | |
888 | goto cleanup; | |
1da177e4 LT |
889 | return 0; |
890 | ||
891 | cleanup: | |
892 | vmlogrdr_cleanup(); | |
1da177e4 LT |
893 | return rc; |
894 | } | |
895 | ||
896 | ||
f60d8910 | 897 | static void __exit vmlogrdr_exit(void) |
1da177e4 LT |
898 | { |
899 | vmlogrdr_cleanup(); | |
1da177e4 LT |
900 | return; |
901 | } | |
902 | ||
903 | ||
904 | module_init(vmlogrdr_init); | |
905 | module_exit(vmlogrdr_exit); |