blob: 8432a76b961ed2932b8c318272eb38ff0beb3014 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/s390/char/vmlogrdr.c
3 * character device driver for reading z/VM system service records
4 *
5 *
Martin Schwidefskyc9101c52007-02-08 13:40:41 -08006 * Copyright 2004 IBM Corporation
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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 */
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/errno.h>
16#include <linux/types.h>
17#include <linux/interrupt.h>
18#include <linux/spinlock.h>
19#include <asm/atomic.h>
20#include <asm/uaccess.h>
21#include <asm/cpcmd.h>
22#include <asm/debug.h>
23#include <asm/ebcdic.h>
Martin Schwidefskyc9101c52007-02-08 13:40:41 -080024#include <net/iucv/iucv.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/kmod.h>
26#include <linux/cdev.h>
27#include <linux/device.h>
28#include <linux/string.h>
29
30
31
32MODULE_AUTHOR
33 ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n"
34 " Stefan Weinhuber (wein@de.ibm.com)");
35MODULE_DESCRIPTION ("Character device driver for reading z/VM "
36 "system service records.");
37MODULE_LICENSE("GPL");
38
39
40/*
41 * The size of the buffer for iucv data transfer is one page,
42 * but in addition to the data we read from iucv we also
43 * place an integer and some characters into that buffer,
44 * so the maximum size for record data is a little less then
45 * one page.
46 */
47#define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE))
48
49/*
50 * The elements that are concurrently accessed by bottom halves are
51 * connection_established, iucv_path_severed, local_interrupt_buffer
52 * and receive_ready. The first three can be protected by
53 * priv_lock. receive_ready is atomic, so it can be incremented and
54 * decremented without holding a lock.
55 * The variable dev_in_use needs to be protected by the lock, since
56 * it's a flag used by open to make sure that the device is opened only
57 * by one user at the same time.
58 */
59struct vmlogrdr_priv_t {
60 char system_service[8];
61 char internal_name[8];
62 char recording_name[8];
Martin Schwidefskyc9101c52007-02-08 13:40:41 -080063 struct iucv_path *path;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 int connection_established;
65 int iucv_path_severed;
Martin Schwidefskyc9101c52007-02-08 13:40:41 -080066 struct iucv_message local_interrupt_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 atomic_t receive_ready;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 int minor_num;
69 char * buffer;
70 char * current_position;
71 int remaining;
72 ulong residual_length;
73 int buffer_free;
74 int dev_in_use; /* 1: already opened, 0: not opened*/
75 spinlock_t priv_lock;
76 struct device *device;
77 struct class_device *class_device;
78 int autorecording;
79 int autopurge;
80};
81
82
83/*
84 * File operation structure for vmlogrdr devices
85 */
86static int vmlogrdr_open(struct inode *, struct file *);
87static int vmlogrdr_release(struct inode *, struct file *);
Heiko Carstensd2c993d2006-07-12 16:41:55 +020088static ssize_t vmlogrdr_read (struct file *filp, char __user *data,
89 size_t count, loff_t * ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91static struct file_operations vmlogrdr_fops = {
92 .owner = THIS_MODULE,
93 .open = vmlogrdr_open,
94 .release = vmlogrdr_release,
95 .read = vmlogrdr_read,
96};
97
98
Martin Schwidefskyc9101c52007-02-08 13:40:41 -080099static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]);
100static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]);
101static void vmlogrdr_iucv_message_pending(struct iucv_path *,
102 struct iucv_message *);
103
104
105static struct iucv_handler vmlogrdr_iucv_handler = {
106 .path_complete = vmlogrdr_iucv_path_complete,
107 .path_severed = vmlogrdr_iucv_path_severed,
108 .message_pending = vmlogrdr_iucv_message_pending,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109};
110
111
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100112static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue);
113static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115/*
116 * pointer to system service private structure
117 * minor number 0 --> logrec
118 * minor number 1 --> account
119 * minor number 2 --> symptom
120 */
121
122static struct vmlogrdr_priv_t sys_ser[] = {
123 { .system_service = "*LOGREC ",
124 .internal_name = "logrec",
125 .recording_name = "EREP",
126 .minor_num = 0,
127 .buffer_free = 1,
128 .priv_lock = SPIN_LOCK_UNLOCKED,
129 .autorecording = 1,
130 .autopurge = 1,
131 },
132 { .system_service = "*ACCOUNT",
133 .internal_name = "account",
134 .recording_name = "ACCOUNT",
135 .minor_num = 1,
136 .buffer_free = 1,
137 .priv_lock = SPIN_LOCK_UNLOCKED,
138 .autorecording = 1,
139 .autopurge = 1,
140 },
141 { .system_service = "*SYMPTOM",
142 .internal_name = "symptom",
143 .recording_name = "SYMPTOM",
144 .minor_num = 2,
145 .buffer_free = 1,
146 .priv_lock = SPIN_LOCK_UNLOCKED,
147 .autorecording = 1,
148 .autopurge = 1,
149 }
150};
151
152#define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t))
153
154static char FENCE[] = {"EOR"};
155static int vmlogrdr_major = 0;
156static struct cdev *vmlogrdr_cdev = NULL;
157static int recording_class_AB;
158
159
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800160static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800162 struct vmlogrdr_priv_t * logptr = path->private;
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 spin_lock(&logptr->priv_lock);
165 logptr->connection_established = 1;
166 spin_unlock(&logptr->priv_lock);
167 wake_up(&conn_wait_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169
170
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800171static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800173 struct vmlogrdr_priv_t * logptr = path->private;
174 u8 reason = (u8) ipuser[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 printk (KERN_ERR "vmlogrdr: connection severed with"
177 " reason %i\n", reason);
178
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800179 iucv_path_sever(path, NULL);
180 kfree(path);
181 logptr->path = NULL;
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 spin_lock(&logptr->priv_lock);
184 logptr->connection_established = 0;
185 logptr->iucv_path_severed = 1;
186 spin_unlock(&logptr->priv_lock);
187
188 wake_up(&conn_wait_queue);
189 /* just in case we're sleeping waiting for a record */
190 wake_up_interruptible(&read_wait_queue);
191}
192
193
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800194static void vmlogrdr_iucv_message_pending(struct iucv_path *path,
195 struct iucv_message *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800197 struct vmlogrdr_priv_t * logptr = path->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 /*
200 * This function is the bottom half so it should be quick.
201 * Copy the external interrupt data into our local eib and increment
202 * the usage count
203 */
204 spin_lock(&logptr->priv_lock);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800205 memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 atomic_inc(&logptr->receive_ready);
207 spin_unlock(&logptr->priv_lock);
208 wake_up_interruptible(&read_wait_queue);
209}
210
211
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800212static int vmlogrdr_get_recording_class_AB(void)
213{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 char cp_command[]="QUERY COMMAND RECORDING ";
215 char cp_response[80];
216 char *tail;
217 int len,i;
218
219 printk (KERN_DEBUG "vmlogrdr: query command: %s\n", cp_command);
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700220 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 printk (KERN_DEBUG "vmlogrdr: response: %s", cp_response);
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
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800243static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr,
244 int action, int purge)
245{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 char cp_command[80];
248 char cp_response[160];
249 char *onoff, *qid_string;
250
251 memset(cp_command, 0x00, sizeof(cp_command));
252 memset(cp_response, 0x00, sizeof(cp_response));
253
254 onoff = ((action == 1) ? "ON" : "OFF");
255 qid_string = ((recording_class_AB == 1) ? " QID * " : "");
256
257 /*
258 * The recording commands needs to be called with option QID
259 * for guests that have previlege classes A or B.
260 * Purging has to be done as separate step, because recording
261 * can't be switched on as long as records are on the queue.
262 * Doing both at the same time doesn't work.
263 */
264
265 if (purge) {
266 snprintf(cp_command, sizeof(cp_command),
267 "RECORDING %s PURGE %s",
268 logptr->recording_name,
269 qid_string);
270
271 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n",
272 cp_command);
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700273 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 printk (KERN_DEBUG "vmlogrdr: recording response: %s",
275 cp_response);
276 }
277
278 memset(cp_command, 0x00, sizeof(cp_command));
279 memset(cp_response, 0x00, sizeof(cp_response));
280 snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s",
281 logptr->recording_name,
282 onoff,
283 qid_string);
284
285 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command);
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700286 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 printk (KERN_DEBUG "vmlogrdr: recording response: %s",
288 cp_response);
289 /* The recording command will usually answer with 'Command complete'
290 * on success, but when the specific service was never connected
291 * before then there might be an additional informational message
292 * 'HCPCRC8072I Recording entry not found' before the
293 * 'Command complete'. So I use strstr rather then the strncmp.
294 */
295 if (strstr(cp_response,"Command complete"))
296 return 0;
297 else
298 return -EIO;
299
300}
301
302
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800303static int vmlogrdr_open (struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
305 int dev_num = 0;
306 struct vmlogrdr_priv_t * logptr = NULL;
307 int connect_rc = 0;
308 int ret;
309
310 dev_num = iminor(inode);
311 if (dev_num > MAXMINOR)
312 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 logptr = &sys_ser[dev_num];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 /*
316 * only allow for blocking reads to be open
317 */
318 if (filp->f_flags & O_NONBLOCK)
319 return -ENOSYS;
320
321 /* Besure this device hasn't already been opened */
322 spin_lock_bh(&logptr->priv_lock);
323 if (logptr->dev_in_use) {
324 spin_unlock_bh(&logptr->priv_lock);
325 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800327 logptr->dev_in_use = 1;
328 logptr->connection_established = 0;
329 logptr->iucv_path_severed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 atomic_set(&logptr->receive_ready, 0);
331 logptr->buffer_free = 1;
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800332 spin_unlock_bh(&logptr->priv_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 /* set the file options */
335 filp->private_data = logptr;
336 filp->f_op = &vmlogrdr_fops;
337
338 /* start recording for this service*/
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800339 if (logptr->autorecording) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 ret = vmlogrdr_recording(logptr,1,logptr->autopurge);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800341 if (ret)
342 printk (KERN_WARNING "vmlogrdr: failed to start "
343 "recording automatically\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345
346 /* create connection to the system service */
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800347 logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL);
348 if (!logptr->path)
349 goto out_dev;
350 connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler,
351 logptr->system_service, NULL, NULL,
352 logptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 if (connect_rc) {
354 printk (KERN_ERR "vmlogrdr: iucv connection to %s "
355 "failed with rc %i \n", logptr->system_service,
356 connect_rc);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800357 goto out_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
359
360 /* We've issued the connect and now we must wait for a
361 * ConnectionComplete or ConnectinSevered Interrupt
362 * before we can continue to process.
363 */
364 wait_event(conn_wait_queue, (logptr->connection_established)
365 || (logptr->iucv_path_severed));
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800366 if (logptr->iucv_path_severed)
367 goto out_record;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return nonseekable_open(inode, filp);
369
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800370out_record:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 if (logptr->autorecording)
372 vmlogrdr_recording(logptr,0,logptr->autopurge);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800373out_path:
374 kfree(logptr->path); /* kfree(NULL) is ok. */
375 logptr->path = NULL;
376out_dev:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 logptr->dev_in_use = 0;
378 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379}
380
381
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800382static int vmlogrdr_release (struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 int ret;
385
386 struct vmlogrdr_priv_t * logptr = filp->private_data;
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (logptr->autorecording) {
389 ret = vmlogrdr_recording(logptr,0,logptr->autopurge);
390 if (ret)
391 printk (KERN_WARNING "vmlogrdr: failed to stop "
392 "recording automatically\n");
393 }
394 logptr->dev_in_use = 0;
395
396 return 0;
397}
398
399
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800400static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv)
401{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 int rc, *temp;
403 /* we need to keep track of two data sizes here:
404 * The number of bytes we need to receive from iucv and
405 * the total number of bytes we actually write into the buffer.
406 */
407 int user_data_count, iucv_data_count;
408 char * buffer;
409
410 if (atomic_read(&priv->receive_ready)) {
411 spin_lock_bh(&priv->priv_lock);
412 if (priv->residual_length){
413 /* receive second half of a record */
414 iucv_data_count = priv->residual_length;
415 user_data_count = 0;
416 buffer = priv->buffer;
417 } else {
418 /* receive a new record:
419 * We need to return the total length of the record
420 * + size of FENCE in the first 4 bytes of the buffer.
421 */
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800422 iucv_data_count = priv->local_interrupt_buffer.length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 user_data_count = sizeof(int);
424 temp = (int*)priv->buffer;
425 *temp= iucv_data_count + sizeof(FENCE);
426 buffer = priv->buffer + sizeof(int);
427 }
428 /*
429 * If the record is bigger then our buffer, we receive only
430 * a part of it. We can get the rest later.
431 */
432 if (iucv_data_count > NET_BUFFER_SIZE)
433 iucv_data_count = NET_BUFFER_SIZE;
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800434 rc = iucv_message_receive(priv->path,
435 &priv->local_interrupt_buffer,
436 0, buffer, iucv_data_count,
437 &priv->residual_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 spin_unlock_bh(&priv->priv_lock);
439 /* An rc of 5 indicates that the record was bigger then
440 * the buffer, which is OK for us. A 9 indicates that the
441 * record was purged befor we could receive it.
442 */
443 if (rc == 5)
444 rc = 0;
445 if (rc == 9)
446 atomic_set(&priv->receive_ready, 0);
447 } else {
448 rc = 1;
449 }
450 if (!rc) {
451 priv->buffer_free = 0;
452 user_data_count += iucv_data_count;
453 priv->current_position = priv->buffer;
454 if (priv->residual_length == 0){
455 /* the whole record has been captured,
456 * now add the fence */
457 atomic_dec(&priv->receive_ready);
458 buffer = priv->buffer + user_data_count;
459 memcpy(buffer, FENCE, sizeof(FENCE));
460 user_data_count += sizeof(FENCE);
461 }
462 priv->remaining = user_data_count;
463 }
464
465 return rc;
466}
467
468
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800469static ssize_t vmlogrdr_read(struct file *filp, char __user *data,
470 size_t count, loff_t * ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 int rc;
473 struct vmlogrdr_priv_t * priv = filp->private_data;
474
475 while (priv->buffer_free) {
476 rc = vmlogrdr_receive_data(priv);
477 if (rc) {
478 rc = wait_event_interruptible(read_wait_queue,
479 atomic_read(&priv->receive_ready));
480 if (rc)
481 return rc;
482 }
483 }
484 /* copy only up to end of record */
485 if (count > priv->remaining)
486 count = priv->remaining;
487
488 if (copy_to_user(data, priv->current_position, count))
489 return -EFAULT;
490
491 *ppos += count;
492 priv->current_position += count;
493 priv->remaining -= count;
494
495 /* if all data has been transferred, set buffer free */
496 if (priv->remaining == 0)
497 priv->buffer_free = 1;
498
499 return count;
500}
501
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800502static ssize_t vmlogrdr_autopurge_store(struct device * dev,
503 struct device_attribute *attr,
504 const char * buf, size_t count)
505{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 struct vmlogrdr_priv_t *priv = dev->driver_data;
507 ssize_t ret = count;
508
509 switch (buf[0]) {
510 case '0':
511 priv->autopurge=0;
512 break;
513 case '1':
514 priv->autopurge=1;
515 break;
516 default:
517 ret = -EINVAL;
518 }
519 return ret;
520}
521
522
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800523static ssize_t vmlogrdr_autopurge_show(struct device *dev,
524 struct device_attribute *attr,
525 char *buf)
526{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 struct vmlogrdr_priv_t *priv = dev->driver_data;
528 return sprintf(buf, "%u\n", priv->autopurge);
529}
530
531
532static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show,
533 vmlogrdr_autopurge_store);
534
535
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800536static ssize_t vmlogrdr_purge_store(struct device * dev,
537 struct device_attribute *attr,
538 const char * buf, size_t count)
539{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 char cp_command[80];
542 char cp_response[80];
543 struct vmlogrdr_priv_t *priv = dev->driver_data;
544
545 if (buf[0] != '1')
546 return -EINVAL;
547
548 memset(cp_command, 0x00, sizeof(cp_command));
549 memset(cp_response, 0x00, sizeof(cp_response));
550
551 /*
552 * The recording command needs to be called with option QID
553 * for guests that have previlege classes A or B.
554 * Other guests will not recognize the command and we have to
555 * issue the same command without the QID parameter.
556 */
557
558 if (recording_class_AB)
559 snprintf(cp_command, sizeof(cp_command),
560 "RECORDING %s PURGE QID * ",
561 priv->recording_name);
562 else
563 snprintf(cp_command, sizeof(cp_command),
564 "RECORDING %s PURGE ",
565 priv->recording_name);
566
567 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command);
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700568 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 printk (KERN_DEBUG "vmlogrdr: recording response: %s",
570 cp_response);
571
572 return count;
573}
574
575
576static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store);
577
578
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800579static ssize_t vmlogrdr_autorecording_store(struct device *dev,
580 struct device_attribute *attr,
581 const char *buf, size_t count)
582{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 struct vmlogrdr_priv_t *priv = dev->driver_data;
584 ssize_t ret = count;
585
586 switch (buf[0]) {
587 case '0':
588 priv->autorecording=0;
589 break;
590 case '1':
591 priv->autorecording=1;
592 break;
593 default:
594 ret = -EINVAL;
595 }
596 return ret;
597}
598
599
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800600static ssize_t vmlogrdr_autorecording_show(struct device *dev,
601 struct device_attribute *attr,
602 char *buf)
603{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 struct vmlogrdr_priv_t *priv = dev->driver_data;
605 return sprintf(buf, "%u\n", priv->autorecording);
606}
607
608
609static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show,
610 vmlogrdr_autorecording_store);
611
612
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800613static ssize_t vmlogrdr_recording_store(struct device * dev,
614 struct device_attribute *attr,
615 const char * buf, size_t count)
616{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 struct vmlogrdr_priv_t *priv = dev->driver_data;
618 ssize_t ret;
619
620 switch (buf[0]) {
621 case '0':
622 ret = vmlogrdr_recording(priv,0,0);
623 break;
624 case '1':
625 ret = vmlogrdr_recording(priv,1,0);
626 break;
627 default:
628 ret = -EINVAL;
629 }
630 if (ret)
631 return ret;
632 else
633 return count;
634
635}
636
637
638static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store);
639
640
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800641static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver,
642 char *buf)
643{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 char cp_command[] = "QUERY RECORDING ";
646 int len;
647
Christian Borntraeger6b979de2005-06-25 14:55:32 -0700648 cpcmd(cp_command, buf, 4096, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 len = strlen(buf);
650 return len;
651}
652
653
654static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show,
655 NULL);
656
657static struct attribute *vmlogrdr_attrs[] = {
658 &dev_attr_autopurge.attr,
659 &dev_attr_purge.attr,
660 &dev_attr_autorecording.attr,
661 &dev_attr_recording.attr,
662 NULL,
663};
664
665static struct attribute_group vmlogrdr_attr_group = {
666 .attrs = vmlogrdr_attrs,
667};
668
gregkh@suse.de56b22932005-03-23 10:01:41 -0800669static struct class *vmlogrdr_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670static struct device_driver vmlogrdr_driver = {
671 .name = "vmlogrdr",
672 .bus = &iucv_bus,
673};
674
675
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800676static int vmlogrdr_register_driver(void)
677{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 int ret;
679
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800680 /* Register with iucv driver */
681 ret = iucv_register(&vmlogrdr_iucv_handler, 1);
682 if (ret) {
683 printk (KERN_ERR "vmlogrdr: failed to register with"
684 "iucv driver\n");
685 goto out;
686 }
687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 ret = driver_register(&vmlogrdr_driver);
689 if (ret) {
690 printk(KERN_ERR "vmlogrdr: failed to register driver.\n");
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800691 goto out_iucv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 }
693
694 ret = driver_create_file(&vmlogrdr_driver,
695 &driver_attr_recording_status);
696 if (ret) {
697 printk(KERN_ERR "vmlogrdr: failed to add driver attribute.\n");
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800698 goto out_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 }
700
gregkh@suse.de56b22932005-03-23 10:01:41 -0800701 vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (IS_ERR(vmlogrdr_class)) {
703 printk(KERN_ERR "vmlogrdr: failed to create class.\n");
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800704 ret = PTR_ERR(vmlogrdr_class);
705 vmlogrdr_class = NULL;
706 goto out_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 }
708 return 0;
709
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800710out_attr:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800712out_driver:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 driver_unregister(&vmlogrdr_driver);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800714out_iucv:
715 iucv_unregister(&vmlogrdr_iucv_handler, 1);
716out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 return ret;
718}
719
720
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800721static void vmlogrdr_unregister_driver(void)
722{
gregkh@suse.de56b22932005-03-23 10:01:41 -0800723 class_destroy(vmlogrdr_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 vmlogrdr_class = NULL;
725 driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status);
726 driver_unregister(&vmlogrdr_driver);
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800727 iucv_unregister(&vmlogrdr_iucv_handler, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728}
729
730
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800731static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
732{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 struct device *dev;
734 int ret;
735
Eric Sesterhenn88abaab2006-03-24 03:15:31 -0800736 dev = kzalloc(sizeof(struct device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 snprintf(dev->bus_id, BUS_ID_SIZE, "%s",
739 priv->internal_name);
740 dev->bus = &iucv_bus;
741 dev->parent = iucv_root;
742 dev->driver = &vmlogrdr_driver;
743 /*
744 * The release function could be called after the
745 * module has been unloaded. It's _only_ task is to
746 * free the struct. Therefore, we specify kfree()
747 * directly here. (Probably a little bit obfuscating
748 * but legitime ...).
749 */
750 dev->release = (void (*)(struct device *))kfree;
751 } else
752 return -ENOMEM;
753 ret = device_register(dev);
754 if (ret)
755 return ret;
756
757 ret = sysfs_create_group(&dev->kobj, &vmlogrdr_attr_group);
758 if (ret) {
759 device_unregister(dev);
760 return ret;
761 }
gregkh@suse.de56b22932005-03-23 10:01:41 -0800762 priv->class_device = class_device_create(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 vmlogrdr_class,
Al Virof6b52e82005-10-29 07:06:59 +0100764 NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 MKDEV(vmlogrdr_major, priv->minor_num),
766 dev,
767 "%s", dev->bus_id );
768 if (IS_ERR(priv->class_device)) {
769 ret = PTR_ERR(priv->class_device);
770 priv->class_device=NULL;
771 sysfs_remove_group(&dev->kobj, &vmlogrdr_attr_group);
772 device_unregister(dev);
773 return ret;
774 }
775 dev->driver_data = priv;
776 priv->device = dev;
777 return 0;
778}
779
780
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800781static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv)
782{
783 class_device_destroy(vmlogrdr_class,
784 MKDEV(vmlogrdr_major, priv->minor_num));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 if (priv->device != NULL) {
786 sysfs_remove_group(&priv->device->kobj, &vmlogrdr_attr_group);
787 device_unregister(priv->device);
788 priv->device=NULL;
789 }
790 return 0;
791}
792
793
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800794static int vmlogrdr_register_cdev(dev_t dev)
795{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 int rc = 0;
797 vmlogrdr_cdev = cdev_alloc();
798 if (!vmlogrdr_cdev) {
799 return -ENOMEM;
800 }
801 vmlogrdr_cdev->owner = THIS_MODULE;
802 vmlogrdr_cdev->ops = &vmlogrdr_fops;
803 vmlogrdr_cdev->dev = dev;
804 rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR);
805 if (!rc)
806 return 0;
807
808 // cleanup: cdev is not fully registered, no cdev_del here!
809 kobject_put(&vmlogrdr_cdev->kobj);
810 vmlogrdr_cdev=NULL;
811 return rc;
812}
813
814
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800815static void vmlogrdr_cleanup(void)
816{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 int i;
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800818
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 if (vmlogrdr_cdev) {
820 cdev_del(vmlogrdr_cdev);
821 vmlogrdr_cdev=NULL;
822 }
823 for (i=0; i < MAXMINOR; ++i ) {
824 vmlogrdr_unregister_device(&sys_ser[i]);
825 free_page((unsigned long)sys_ser[i].buffer);
826 }
827 vmlogrdr_unregister_driver();
828 if (vmlogrdr_major) {
829 unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR);
830 vmlogrdr_major=0;
831 }
832}
833
834
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800835static int vmlogrdr_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836{
837 int rc;
838 int i;
839 dev_t dev;
840
841 if (! MACHINE_IS_VM) {
842 printk (KERN_ERR "vmlogrdr: not running under VM, "
843 "driver not loaded.\n");
844 return -ENODEV;
845 }
846
847 recording_class_AB = vmlogrdr_get_recording_class_AB();
848
849 rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr");
850 if (rc)
851 return rc;
852 vmlogrdr_major = MAJOR(dev);
853
854 rc=vmlogrdr_register_driver();
855 if (rc)
856 goto cleanup;
857
858 for (i=0; i < MAXMINOR; ++i ) {
859 sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL);
860 if (!sys_ser[i].buffer) {
861 rc = ENOMEM;
862 break;
863 }
864 sys_ser[i].current_position = sys_ser[i].buffer;
865 rc=vmlogrdr_register_device(&sys_ser[i]);
866 if (rc)
867 break;
868 }
869 if (rc)
870 goto cleanup;
871
872 rc = vmlogrdr_register_cdev(dev);
873 if (rc)
874 goto cleanup;
875 printk (KERN_INFO "vmlogrdr: driver loaded\n");
876 return 0;
877
878cleanup:
879 vmlogrdr_cleanup();
880 printk (KERN_ERR "vmlogrdr: driver not loaded.\n");
881 return rc;
882}
883
884
Martin Schwidefskyc9101c52007-02-08 13:40:41 -0800885static void vmlogrdr_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
887 vmlogrdr_cleanup();
888 printk (KERN_INFO "vmlogrdr: driver unloaded\n");
889 return;
890}
891
892
893module_init(vmlogrdr_init);
894module_exit(vmlogrdr_exit);