Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/monreader.c | |
3 | * | |
4 | * Character device driver for reading z/VM *MONITOR service records. | |
5 | * | |
6 | * Copyright (C) 2004 IBM Corporation, IBM Deutschland Entwicklung GmbH. | |
7 | * | |
8 | * Author: Gerald Schaefer <geraldsc@de.ibm.com> | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/moduleparam.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/miscdevice.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/extmem.h> | |
24 | #include <linux/poll.h> | |
25 | #include "../net/iucv.h" | |
26 | ||
27 | ||
28 | //#define MON_DEBUG /* Debug messages on/off */ | |
29 | ||
30 | #define MON_NAME "monreader" | |
31 | ||
32 | #define P_INFO(x...) printk(KERN_INFO MON_NAME " info: " x) | |
33 | #define P_ERROR(x...) printk(KERN_ERR MON_NAME " error: " x) | |
34 | #define P_WARNING(x...) printk(KERN_WARNING MON_NAME " warning: " x) | |
35 | ||
36 | #ifdef MON_DEBUG | |
37 | #define P_DEBUG(x...) printk(KERN_DEBUG MON_NAME " debug: " x) | |
38 | #else | |
39 | #define P_DEBUG(x...) do {} while (0) | |
40 | #endif | |
41 | ||
42 | #define MON_COLLECT_SAMPLE 0x80 | |
43 | #define MON_COLLECT_EVENT 0x40 | |
44 | #define MON_SERVICE "*MONITOR" | |
45 | #define MON_IN_USE 0x01 | |
46 | #define MON_MSGLIM 255 | |
47 | ||
48 | static char mon_dcss_name[9] = "MONDCSS\0"; | |
49 | ||
50 | struct mon_msg { | |
51 | u32 pos; | |
52 | u32 mca_offset; | |
53 | iucv_MessagePending local_eib; | |
54 | char msglim_reached; | |
55 | char replied_msglim; | |
56 | }; | |
57 | ||
58 | struct mon_private { | |
59 | u16 pathid; | |
60 | iucv_handle_t iucv_handle; | |
61 | struct mon_msg *msg_array[MON_MSGLIM]; | |
62 | unsigned int write_index; | |
63 | unsigned int read_index; | |
64 | atomic_t msglim_count; | |
65 | atomic_t read_ready; | |
66 | atomic_t iucv_connected; | |
67 | atomic_t iucv_severed; | |
68 | }; | |
69 | ||
70 | static unsigned long mon_in_use = 0; | |
71 | ||
72 | static unsigned long mon_dcss_start; | |
73 | static unsigned long mon_dcss_end; | |
74 | ||
75 | static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue); | |
76 | static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue); | |
77 | ||
78 | static u8 iucv_host[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; | |
79 | ||
80 | static u8 user_data_connect[16] = { | |
81 | /* Version code, must be 0x01 for shared mode */ | |
82 | 0x01, | |
83 | /* what to collect */ | |
84 | MON_COLLECT_SAMPLE | MON_COLLECT_EVENT, | |
85 | /* DCSS name in EBCDIC, 8 bytes padded with blanks */ | |
86 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
87 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
88 | }; | |
89 | ||
90 | static u8 user_data_sever[16] = { | |
91 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
92 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
93 | }; | |
94 | ||
95 | ||
96 | /****************************************************************************** | |
97 | * helper functions * | |
98 | *****************************************************************************/ | |
99 | /* | |
100 | * Create the 8 bytes EBCDIC DCSS segment name from | |
101 | * an ASCII name, incl. padding | |
102 | */ | |
103 | static inline void | |
104 | dcss_mkname(char *ascii_name, char *ebcdic_name) | |
105 | { | |
106 | int i; | |
107 | ||
108 | for (i = 0; i < 8; i++) { | |
109 | if (ascii_name[i] == '\0') | |
110 | break; | |
111 | ebcdic_name[i] = toupper(ascii_name[i]); | |
112 | }; | |
113 | for (; i < 8; i++) | |
114 | ebcdic_name[i] = ' '; | |
115 | ASCEBC(ebcdic_name, 8); | |
116 | } | |
117 | ||
118 | /* | |
119 | * print appropriate error message for segment_load()/segment_type() | |
120 | * return code | |
121 | */ | |
122 | static void | |
123 | mon_segment_warn(int rc, char* seg_name) | |
124 | { | |
125 | switch (rc) { | |
126 | case -ENOENT: | |
127 | P_WARNING("cannot load/query segment %s, does not exist\n", | |
128 | seg_name); | |
129 | break; | |
130 | case -ENOSYS: | |
131 | P_WARNING("cannot load/query segment %s, not running on VM\n", | |
132 | seg_name); | |
133 | break; | |
134 | case -EIO: | |
135 | P_WARNING("cannot load/query segment %s, hardware error\n", | |
136 | seg_name); | |
137 | break; | |
138 | case -ENOTSUPP: | |
139 | P_WARNING("cannot load/query segment %s, is a multi-part " | |
140 | "segment\n", seg_name); | |
141 | break; | |
142 | case -ENOSPC: | |
143 | P_WARNING("cannot load/query segment %s, overlaps with " | |
144 | "storage\n", seg_name); | |
145 | break; | |
146 | case -EBUSY: | |
147 | P_WARNING("cannot load/query segment %s, overlaps with " | |
148 | "already loaded dcss\n", seg_name); | |
149 | break; | |
150 | case -EPERM: | |
151 | P_WARNING("cannot load/query segment %s, already loaded in " | |
152 | "incompatible mode\n", seg_name); | |
153 | break; | |
154 | case -ENOMEM: | |
155 | P_WARNING("cannot load/query segment %s, out of memory\n", | |
156 | seg_name); | |
157 | break; | |
158 | case -ERANGE: | |
159 | P_WARNING("cannot load/query segment %s, exceeds kernel " | |
160 | "mapping range\n", seg_name); | |
161 | break; | |
162 | default: | |
163 | P_WARNING("cannot load/query segment %s, return value %i\n", | |
164 | seg_name, rc); | |
165 | break; | |
166 | } | |
167 | } | |
168 | ||
169 | static inline unsigned long | |
170 | mon_mca_start(struct mon_msg *monmsg) | |
171 | { | |
172 | return monmsg->local_eib.ln1msg1.iprmmsg1_u32; | |
173 | } | |
174 | ||
175 | static inline unsigned long | |
176 | mon_mca_end(struct mon_msg *monmsg) | |
177 | { | |
178 | return monmsg->local_eib.ln1msg2.ipbfln1f; | |
179 | } | |
180 | ||
181 | static inline u8 | |
182 | mon_mca_type(struct mon_msg *monmsg, u8 index) | |
183 | { | |
184 | return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index); | |
185 | } | |
186 | ||
187 | static inline u32 | |
188 | mon_mca_size(struct mon_msg *monmsg) | |
189 | { | |
190 | return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1; | |
191 | } | |
192 | ||
193 | static inline u32 | |
194 | mon_rec_start(struct mon_msg *monmsg) | |
195 | { | |
196 | return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4)); | |
197 | } | |
198 | ||
199 | static inline u32 | |
200 | mon_rec_end(struct mon_msg *monmsg) | |
201 | { | |
202 | return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8)); | |
203 | } | |
204 | ||
205 | static inline int | |
206 | mon_check_mca(struct mon_msg *monmsg) | |
207 | { | |
208 | if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) || | |
209 | (mon_rec_start(monmsg) < mon_dcss_start) || | |
210 | (mon_rec_end(monmsg) > mon_dcss_end) || | |
211 | (mon_mca_type(monmsg, 0) == 0) || | |
212 | (mon_mca_size(monmsg) % 12 != 0) || | |
213 | (mon_mca_end(monmsg) <= mon_mca_start(monmsg)) || | |
214 | (mon_mca_end(monmsg) > mon_dcss_end) || | |
215 | (mon_mca_start(monmsg) < mon_dcss_start) || | |
216 | ((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0))) | |
217 | { | |
218 | P_DEBUG("READ, IGNORED INVALID MCA\n\n"); | |
219 | return -EINVAL; | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static inline int | |
225 | mon_send_reply(struct mon_msg *monmsg, struct mon_private *monpriv) | |
226 | { | |
227 | u8 prmmsg[8]; | |
228 | int rc; | |
229 | ||
230 | P_DEBUG("read, REPLY: pathid = 0x%04X, msgid = 0x%08X, trgcls = " | |
231 | "0x%08X\n\n", | |
232 | monmsg->local_eib.ippathid, monmsg->local_eib.ipmsgid, | |
233 | monmsg->local_eib.iptrgcls); | |
234 | rc = iucv_reply_prmmsg(monmsg->local_eib.ippathid, | |
235 | monmsg->local_eib.ipmsgid, | |
236 | monmsg->local_eib.iptrgcls, | |
237 | 0, prmmsg); | |
238 | atomic_dec(&monpriv->msglim_count); | |
239 | if (likely(!monmsg->msglim_reached)) { | |
240 | monmsg->pos = 0; | |
241 | monmsg->mca_offset = 0; | |
242 | monpriv->read_index = (monpriv->read_index + 1) % | |
243 | MON_MSGLIM; | |
244 | atomic_dec(&monpriv->read_ready); | |
245 | } else | |
246 | monmsg->replied_msglim = 1; | |
247 | if (rc) { | |
248 | P_ERROR("read, IUCV reply failed with rc = %i\n\n", rc); | |
249 | return -EIO; | |
250 | } | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static inline struct mon_private * | |
255 | mon_alloc_mem(void) | |
256 | { | |
257 | int i,j; | |
258 | struct mon_private *monpriv; | |
259 | ||
88abaab4 | 260 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); |
1da177e4 LT |
261 | if (!monpriv) { |
262 | P_ERROR("no memory for monpriv\n"); | |
263 | return NULL; | |
264 | } | |
1da177e4 | 265 | for (i = 0; i < MON_MSGLIM; i++) { |
88abaab4 | 266 | monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg), |
1da177e4 LT |
267 | GFP_KERNEL); |
268 | if (!monpriv->msg_array[i]) { | |
269 | P_ERROR("open, no memory for msg_array\n"); | |
270 | for (j = 0; j < i; j++) | |
271 | kfree(monpriv->msg_array[j]); | |
272 | return NULL; | |
273 | } | |
1da177e4 LT |
274 | } |
275 | return monpriv; | |
276 | } | |
277 | ||
278 | static inline void | |
279 | mon_read_debug(struct mon_msg *monmsg, struct mon_private *monpriv) | |
280 | { | |
281 | #ifdef MON_DEBUG | |
282 | u8 msg_type[2], mca_type; | |
283 | unsigned long records_len; | |
284 | ||
285 | records_len = mon_rec_end(monmsg) - mon_rec_start(monmsg) + 1; | |
286 | ||
287 | memcpy(msg_type, &monmsg->local_eib.iptrgcls, 2); | |
288 | EBCASC(msg_type, 2); | |
289 | mca_type = mon_mca_type(monmsg, 0); | |
290 | EBCASC(&mca_type, 1); | |
291 | ||
292 | P_DEBUG("read, mon_read_index = %i, mon_write_index = %i\n", | |
293 | monpriv->read_index, monpriv->write_index); | |
294 | P_DEBUG("read, pathid = 0x%04X, msgid = 0x%08X, trgcls = 0x%08X\n", | |
295 | monmsg->local_eib.ippathid, monmsg->local_eib.ipmsgid, | |
296 | monmsg->local_eib.iptrgcls); | |
297 | P_DEBUG("read, msg_type = '%c%c', mca_type = '%c' / 0x%X / 0x%X\n", | |
298 | msg_type[0], msg_type[1], mca_type ? mca_type : 'X', | |
299 | mon_mca_type(monmsg, 1), mon_mca_type(monmsg, 2)); | |
300 | P_DEBUG("read, MCA: start = 0x%lX, end = 0x%lX\n", | |
301 | mon_mca_start(monmsg), mon_mca_end(monmsg)); | |
302 | P_DEBUG("read, REC: start = 0x%X, end = 0x%X, len = %lu\n\n", | |
303 | mon_rec_start(monmsg), mon_rec_end(monmsg), records_len); | |
304 | if (mon_mca_size(monmsg) > 12) | |
305 | P_DEBUG("READ, MORE THAN ONE MCA\n\n"); | |
306 | #endif | |
307 | } | |
308 | ||
309 | static inline void | |
310 | mon_next_mca(struct mon_msg *monmsg) | |
311 | { | |
312 | if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12)) | |
313 | return; | |
314 | P_DEBUG("READ, NEXT MCA\n\n"); | |
315 | monmsg->mca_offset += 12; | |
316 | monmsg->pos = 0; | |
317 | } | |
318 | ||
319 | static inline struct mon_msg * | |
320 | mon_next_message(struct mon_private *monpriv) | |
321 | { | |
322 | struct mon_msg *monmsg; | |
323 | ||
324 | if (!atomic_read(&monpriv->read_ready)) | |
325 | return NULL; | |
326 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
327 | if (unlikely(monmsg->replied_msglim)) { | |
328 | monmsg->replied_msglim = 0; | |
329 | monmsg->msglim_reached = 0; | |
330 | monmsg->pos = 0; | |
331 | monmsg->mca_offset = 0; | |
332 | P_WARNING("read, message limit reached\n"); | |
333 | monpriv->read_index = (monpriv->read_index + 1) % | |
334 | MON_MSGLIM; | |
335 | atomic_dec(&monpriv->read_ready); | |
336 | return ERR_PTR(-EOVERFLOW); | |
337 | } | |
338 | return monmsg; | |
339 | } | |
340 | ||
341 | ||
342 | /****************************************************************************** | |
343 | * IUCV handler * | |
344 | *****************************************************************************/ | |
345 | static void | |
346 | mon_iucv_ConnectionComplete(iucv_ConnectionComplete *eib, void *pgm_data) | |
347 | { | |
348 | struct mon_private *monpriv = (struct mon_private *) pgm_data; | |
349 | ||
350 | P_DEBUG("IUCV connection completed\n"); | |
351 | P_DEBUG("IUCV ACCEPT (from *MONITOR): Version = 0x%02X, Event = " | |
352 | "0x%02X, Sample = 0x%02X\n", | |
353 | eib->ipuser[0], eib->ipuser[1], eib->ipuser[2]); | |
354 | atomic_set(&monpriv->iucv_connected, 1); | |
355 | wake_up(&mon_conn_wait_queue); | |
356 | } | |
357 | ||
358 | static void | |
359 | mon_iucv_ConnectionSevered(iucv_ConnectionSevered *eib, void *pgm_data) | |
360 | { | |
361 | struct mon_private *monpriv = (struct mon_private *) pgm_data; | |
362 | ||
363 | P_ERROR("IUCV connection severed with rc = 0x%X\n", | |
364 | (u8) eib->ipuser[0]); | |
365 | atomic_set(&monpriv->iucv_severed, 1); | |
366 | wake_up(&mon_conn_wait_queue); | |
367 | wake_up_interruptible(&mon_read_wait_queue); | |
368 | } | |
369 | ||
370 | static void | |
371 | mon_iucv_MessagePending(iucv_MessagePending *eib, void *pgm_data) | |
372 | { | |
373 | struct mon_private *monpriv = (struct mon_private *) pgm_data; | |
374 | ||
375 | P_DEBUG("IUCV message pending\n"); | |
376 | memcpy(&monpriv->msg_array[monpriv->write_index]->local_eib, eib, | |
377 | sizeof(iucv_MessagePending)); | |
378 | if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) { | |
379 | P_WARNING("IUCV message pending, message limit (%i) reached\n", | |
380 | MON_MSGLIM); | |
381 | monpriv->msg_array[monpriv->write_index]->msglim_reached = 1; | |
382 | } | |
383 | monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM; | |
384 | atomic_inc(&monpriv->read_ready); | |
385 | wake_up_interruptible(&mon_read_wait_queue); | |
386 | } | |
387 | ||
388 | static iucv_interrupt_ops_t mon_iucvops = { | |
389 | .ConnectionComplete = mon_iucv_ConnectionComplete, | |
390 | .ConnectionSevered = mon_iucv_ConnectionSevered, | |
391 | .MessagePending = mon_iucv_MessagePending, | |
392 | }; | |
393 | ||
394 | /****************************************************************************** | |
395 | * file operations * | |
396 | *****************************************************************************/ | |
397 | static int | |
398 | mon_open(struct inode *inode, struct file *filp) | |
399 | { | |
400 | int rc, i; | |
401 | struct mon_private *monpriv; | |
402 | ||
403 | /* | |
404 | * only one user allowed | |
405 | */ | |
406 | if (test_and_set_bit(MON_IN_USE, &mon_in_use)) | |
407 | return -EBUSY; | |
408 | ||
409 | monpriv = mon_alloc_mem(); | |
410 | if (!monpriv) | |
411 | return -ENOMEM; | |
412 | ||
413 | /* | |
414 | * Register with IUCV and connect to *MONITOR service | |
415 | */ | |
416 | monpriv->iucv_handle = iucv_register_program("my_monreader ", | |
417 | MON_SERVICE, | |
418 | NULL, | |
419 | &mon_iucvops, | |
420 | monpriv); | |
421 | if (!monpriv->iucv_handle) { | |
422 | P_ERROR("failed to register with iucv driver\n"); | |
423 | rc = -EIO; | |
424 | goto out_error; | |
425 | } | |
426 | P_INFO("open, registered with IUCV\n"); | |
427 | ||
428 | rc = iucv_connect(&monpriv->pathid, MON_MSGLIM, user_data_connect, | |
429 | MON_SERVICE, iucv_host, IPRMDATA, NULL, NULL, | |
430 | monpriv->iucv_handle, NULL); | |
431 | if (rc) { | |
432 | P_ERROR("iucv connection to *MONITOR failed with " | |
433 | "IPUSER SEVER code = %i\n", rc); | |
434 | rc = -EIO; | |
435 | goto out_unregister; | |
436 | } | |
437 | /* | |
438 | * Wait for connection confirmation | |
439 | */ | |
440 | wait_event(mon_conn_wait_queue, | |
441 | atomic_read(&monpriv->iucv_connected) || | |
442 | atomic_read(&monpriv->iucv_severed)); | |
443 | if (atomic_read(&monpriv->iucv_severed)) { | |
444 | atomic_set(&monpriv->iucv_severed, 0); | |
445 | atomic_set(&monpriv->iucv_connected, 0); | |
446 | rc = -EIO; | |
447 | goto out_unregister; | |
448 | } | |
449 | P_INFO("open, established connection to *MONITOR service\n\n"); | |
450 | filp->private_data = monpriv; | |
451 | return nonseekable_open(inode, filp); | |
452 | ||
453 | out_unregister: | |
454 | iucv_unregister_program(monpriv->iucv_handle); | |
455 | out_error: | |
456 | for (i = 0; i < MON_MSGLIM; i++) | |
457 | kfree(monpriv->msg_array[i]); | |
458 | kfree(monpriv); | |
459 | clear_bit(MON_IN_USE, &mon_in_use); | |
460 | return rc; | |
461 | } | |
462 | ||
463 | static int | |
464 | mon_close(struct inode *inode, struct file *filp) | |
465 | { | |
466 | int rc, i; | |
467 | struct mon_private *monpriv = filp->private_data; | |
468 | ||
469 | /* | |
470 | * Close IUCV connection and unregister | |
471 | */ | |
472 | rc = iucv_sever(monpriv->pathid, user_data_sever); | |
473 | if (rc) | |
474 | P_ERROR("close, iucv_sever failed with rc = %i\n", rc); | |
475 | else | |
476 | P_INFO("close, terminated connection to *MONITOR service\n"); | |
477 | ||
478 | rc = iucv_unregister_program(monpriv->iucv_handle); | |
479 | if (rc) | |
480 | P_ERROR("close, iucv_unregister failed with rc = %i\n", rc); | |
481 | else | |
482 | P_INFO("close, unregistered with IUCV\n"); | |
483 | ||
484 | atomic_set(&monpriv->iucv_severed, 0); | |
485 | atomic_set(&monpriv->iucv_connected, 0); | |
486 | atomic_set(&monpriv->read_ready, 0); | |
487 | atomic_set(&monpriv->msglim_count, 0); | |
488 | monpriv->write_index = 0; | |
489 | monpriv->read_index = 0; | |
490 | ||
491 | for (i = 0; i < MON_MSGLIM; i++) | |
492 | kfree(monpriv->msg_array[i]); | |
493 | kfree(monpriv); | |
494 | clear_bit(MON_IN_USE, &mon_in_use); | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static ssize_t | |
499 | mon_read(struct file *filp, char __user *data, size_t count, loff_t *ppos) | |
500 | { | |
501 | struct mon_private *monpriv = filp->private_data; | |
502 | struct mon_msg *monmsg; | |
503 | int ret; | |
504 | u32 mce_start; | |
505 | ||
506 | monmsg = mon_next_message(monpriv); | |
507 | if (IS_ERR(monmsg)) | |
508 | return PTR_ERR(monmsg); | |
509 | ||
510 | if (!monmsg) { | |
511 | if (filp->f_flags & O_NONBLOCK) | |
512 | return -EAGAIN; | |
513 | ret = wait_event_interruptible(mon_read_wait_queue, | |
514 | atomic_read(&monpriv->read_ready) || | |
515 | atomic_read(&monpriv->iucv_severed)); | |
516 | if (ret) | |
517 | return ret; | |
518 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
519 | return -EIO; | |
520 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
521 | } | |
522 | ||
523 | if (!monmsg->pos) { | |
524 | monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset; | |
525 | mon_read_debug(monmsg, monpriv); | |
526 | } | |
527 | if (mon_check_mca(monmsg)) | |
528 | goto reply; | |
529 | ||
530 | /* read monitor control element (12 bytes) first */ | |
531 | mce_start = mon_mca_start(monmsg) + monmsg->mca_offset; | |
532 | if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) { | |
533 | count = min(count, (size_t) mce_start + 12 - monmsg->pos); | |
534 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
535 | count); | |
536 | if (ret) | |
537 | return -EFAULT; | |
538 | monmsg->pos += count; | |
539 | if (monmsg->pos == mce_start + 12) | |
540 | monmsg->pos = mon_rec_start(monmsg); | |
541 | goto out_copy; | |
542 | } | |
543 | ||
544 | /* read records */ | |
545 | if (monmsg->pos <= mon_rec_end(monmsg)) { | |
546 | count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos | |
547 | + 1); | |
548 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
549 | count); | |
550 | if (ret) | |
551 | return -EFAULT; | |
552 | monmsg->pos += count; | |
553 | if (monmsg->pos > mon_rec_end(monmsg)) | |
554 | mon_next_mca(monmsg); | |
555 | goto out_copy; | |
556 | } | |
557 | reply: | |
558 | ret = mon_send_reply(monmsg, monpriv); | |
559 | return ret; | |
560 | ||
561 | out_copy: | |
562 | *ppos += count; | |
563 | return count; | |
564 | } | |
565 | ||
566 | static unsigned int | |
567 | mon_poll(struct file *filp, struct poll_table_struct *p) | |
568 | { | |
569 | struct mon_private *monpriv = filp->private_data; | |
570 | ||
571 | poll_wait(filp, &mon_read_wait_queue, p); | |
572 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
573 | return POLLERR; | |
574 | if (atomic_read(&monpriv->read_ready)) | |
575 | return POLLIN | POLLRDNORM; | |
576 | return 0; | |
577 | } | |
578 | ||
579 | static struct file_operations mon_fops = { | |
580 | .owner = THIS_MODULE, | |
581 | .open = &mon_open, | |
582 | .release = &mon_close, | |
583 | .read = &mon_read, | |
584 | .poll = &mon_poll, | |
585 | }; | |
586 | ||
587 | static struct miscdevice mon_dev = { | |
588 | .name = "monreader", | |
1da177e4 LT |
589 | .fops = &mon_fops, |
590 | .minor = MISC_DYNAMIC_MINOR, | |
591 | }; | |
592 | ||
593 | /****************************************************************************** | |
594 | * module init/exit * | |
595 | *****************************************************************************/ | |
596 | static int __init | |
597 | mon_init(void) | |
598 | { | |
599 | int rc; | |
600 | ||
601 | if (!MACHINE_IS_VM) { | |
602 | P_ERROR("not running under z/VM, driver not loaded\n"); | |
603 | return -ENODEV; | |
604 | } | |
605 | ||
606 | rc = segment_type(mon_dcss_name); | |
607 | if (rc < 0) { | |
608 | mon_segment_warn(rc, mon_dcss_name); | |
609 | return rc; | |
610 | } | |
611 | if (rc != SEG_TYPE_SC) { | |
612 | P_ERROR("segment %s has unsupported type, should be SC\n", | |
613 | mon_dcss_name); | |
614 | return -EINVAL; | |
615 | } | |
616 | ||
617 | rc = segment_load(mon_dcss_name, SEGMENT_SHARED, | |
618 | &mon_dcss_start, &mon_dcss_end); | |
619 | if (rc < 0) { | |
620 | mon_segment_warn(rc, mon_dcss_name); | |
621 | return -EINVAL; | |
622 | } | |
623 | dcss_mkname(mon_dcss_name, &user_data_connect[8]); | |
624 | ||
625 | rc = misc_register(&mon_dev); | |
626 | if (rc < 0 ) { | |
627 | P_ERROR("misc_register failed, rc = %i\n", rc); | |
628 | goto out; | |
629 | } | |
630 | P_INFO("Loaded segment %s from %p to %p, size = %lu Byte\n", | |
631 | mon_dcss_name, (void *) mon_dcss_start, (void *) mon_dcss_end, | |
632 | mon_dcss_end - mon_dcss_start + 1); | |
633 | return 0; | |
634 | ||
635 | out: | |
636 | segment_unload(mon_dcss_name); | |
637 | return rc; | |
638 | } | |
639 | ||
640 | static void __exit | |
641 | mon_exit(void) | |
642 | { | |
643 | segment_unload(mon_dcss_name); | |
644 | WARN_ON(misc_deregister(&mon_dev) != 0); | |
645 | return; | |
646 | } | |
647 | ||
648 | ||
649 | module_init(mon_init); | |
650 | module_exit(mon_exit); | |
651 | ||
652 | module_param_string(mondcss, mon_dcss_name, 9, 0444); | |
653 | MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR " | |
654 | "service, max. 8 chars. Default is MONDCSS"); | |
655 | ||
656 | MODULE_AUTHOR("Gerald Schaefer <geraldsc@de.ibm.com>"); | |
657 | MODULE_DESCRIPTION("Character device driver for reading z/VM " | |
658 | "monitor service records."); | |
659 | MODULE_LICENSE("GPL"); |