Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/monreader.c | |
3 | * | |
4 | * Character device driver for reading z/VM *MONITOR service records. | |
5 | * | |
c667aac8 | 6 | * Copyright 2004 IBM Corporation, IBM Deutschland Entwicklung GmbH. |
1da177e4 LT |
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> | |
c667aac8 | 25 | #include <net/iucv/iucv.h> |
1da177e4 LT |
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; | |
c667aac8 | 53 | struct iucv_message msg; |
1da177e4 LT |
54 | char msglim_reached; |
55 | char replied_msglim; | |
56 | }; | |
57 | ||
58 | struct mon_private { | |
c667aac8 | 59 | struct iucv_path *path; |
1da177e4 LT |
60 | struct mon_msg *msg_array[MON_MSGLIM]; |
61 | unsigned int write_index; | |
62 | unsigned int read_index; | |
63 | atomic_t msglim_count; | |
64 | atomic_t read_ready; | |
65 | atomic_t iucv_connected; | |
66 | atomic_t iucv_severed; | |
67 | }; | |
68 | ||
69 | static unsigned long mon_in_use = 0; | |
70 | ||
71 | static unsigned long mon_dcss_start; | |
72 | static unsigned long mon_dcss_end; | |
73 | ||
74 | static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue); | |
75 | static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue); | |
76 | ||
1da177e4 LT |
77 | static u8 user_data_connect[16] = { |
78 | /* Version code, must be 0x01 for shared mode */ | |
79 | 0x01, | |
80 | /* what to collect */ | |
81 | MON_COLLECT_SAMPLE | MON_COLLECT_EVENT, | |
82 | /* DCSS name in EBCDIC, 8 bytes padded with blanks */ | |
83 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
84 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
85 | }; | |
86 | ||
87 | static u8 user_data_sever[16] = { | |
88 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
89 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
90 | }; | |
91 | ||
92 | ||
93 | /****************************************************************************** | |
94 | * helper functions * | |
95 | *****************************************************************************/ | |
96 | /* | |
97 | * Create the 8 bytes EBCDIC DCSS segment name from | |
98 | * an ASCII name, incl. padding | |
99 | */ | |
9b0c455a | 100 | static void dcss_mkname(char *ascii_name, char *ebcdic_name) |
1da177e4 LT |
101 | { |
102 | int i; | |
103 | ||
104 | for (i = 0; i < 8; i++) { | |
105 | if (ascii_name[i] == '\0') | |
106 | break; | |
107 | ebcdic_name[i] = toupper(ascii_name[i]); | |
108 | }; | |
109 | for (; i < 8; i++) | |
110 | ebcdic_name[i] = ' '; | |
111 | ASCEBC(ebcdic_name, 8); | |
112 | } | |
113 | ||
114 | /* | |
115 | * print appropriate error message for segment_load()/segment_type() | |
116 | * return code | |
117 | */ | |
c667aac8 | 118 | static void mon_segment_warn(int rc, char* seg_name) |
1da177e4 LT |
119 | { |
120 | switch (rc) { | |
121 | case -ENOENT: | |
122 | P_WARNING("cannot load/query segment %s, does not exist\n", | |
123 | seg_name); | |
124 | break; | |
125 | case -ENOSYS: | |
126 | P_WARNING("cannot load/query segment %s, not running on VM\n", | |
127 | seg_name); | |
128 | break; | |
129 | case -EIO: | |
130 | P_WARNING("cannot load/query segment %s, hardware error\n", | |
131 | seg_name); | |
132 | break; | |
133 | case -ENOTSUPP: | |
134 | P_WARNING("cannot load/query segment %s, is a multi-part " | |
135 | "segment\n", seg_name); | |
136 | break; | |
137 | case -ENOSPC: | |
138 | P_WARNING("cannot load/query segment %s, overlaps with " | |
139 | "storage\n", seg_name); | |
140 | break; | |
141 | case -EBUSY: | |
142 | P_WARNING("cannot load/query segment %s, overlaps with " | |
143 | "already loaded dcss\n", seg_name); | |
144 | break; | |
145 | case -EPERM: | |
146 | P_WARNING("cannot load/query segment %s, already loaded in " | |
147 | "incompatible mode\n", seg_name); | |
148 | break; | |
149 | case -ENOMEM: | |
150 | P_WARNING("cannot load/query segment %s, out of memory\n", | |
151 | seg_name); | |
152 | break; | |
153 | case -ERANGE: | |
154 | P_WARNING("cannot load/query segment %s, exceeds kernel " | |
155 | "mapping range\n", seg_name); | |
156 | break; | |
157 | default: | |
158 | P_WARNING("cannot load/query segment %s, return value %i\n", | |
159 | seg_name, rc); | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
c667aac8 | 164 | static inline unsigned long mon_mca_start(struct mon_msg *monmsg) |
1da177e4 | 165 | { |
c667aac8 | 166 | return *(u32 *) &monmsg->msg.rmmsg; |
1da177e4 LT |
167 | } |
168 | ||
c667aac8 | 169 | static inline unsigned long mon_mca_end(struct mon_msg *monmsg) |
1da177e4 | 170 | { |
c667aac8 | 171 | return *(u32 *) &monmsg->msg.rmmsg[4]; |
1da177e4 LT |
172 | } |
173 | ||
c667aac8 | 174 | static inline u8 mon_mca_type(struct mon_msg *monmsg, u8 index) |
1da177e4 LT |
175 | { |
176 | return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index); | |
177 | } | |
178 | ||
c667aac8 | 179 | static inline u32 mon_mca_size(struct mon_msg *monmsg) |
1da177e4 LT |
180 | { |
181 | return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1; | |
182 | } | |
183 | ||
c667aac8 | 184 | static inline u32 mon_rec_start(struct mon_msg *monmsg) |
1da177e4 LT |
185 | { |
186 | return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4)); | |
187 | } | |
188 | ||
c667aac8 | 189 | static inline u32 mon_rec_end(struct mon_msg *monmsg) |
1da177e4 LT |
190 | { |
191 | return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8)); | |
192 | } | |
193 | ||
9b0c455a | 194 | static int mon_check_mca(struct mon_msg *monmsg) |
1da177e4 LT |
195 | { |
196 | if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) || | |
197 | (mon_rec_start(monmsg) < mon_dcss_start) || | |
198 | (mon_rec_end(monmsg) > mon_dcss_end) || | |
199 | (mon_mca_type(monmsg, 0) == 0) || | |
200 | (mon_mca_size(monmsg) % 12 != 0) || | |
201 | (mon_mca_end(monmsg) <= mon_mca_start(monmsg)) || | |
202 | (mon_mca_end(monmsg) > mon_dcss_end) || | |
203 | (mon_mca_start(monmsg) < mon_dcss_start) || | |
204 | ((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0))) | |
205 | { | |
206 | P_DEBUG("READ, IGNORED INVALID MCA\n\n"); | |
207 | return -EINVAL; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
9b0c455a MS |
212 | static int mon_send_reply(struct mon_msg *monmsg, |
213 | struct mon_private *monpriv) | |
1da177e4 | 214 | { |
1da177e4 LT |
215 | int rc; |
216 | ||
217 | P_DEBUG("read, REPLY: pathid = 0x%04X, msgid = 0x%08X, trgcls = " | |
218 | "0x%08X\n\n", | |
c667aac8 MS |
219 | monpriv->path->pathid, monmsg->msg.id, monmsg->msg.class); |
220 | ||
221 | rc = iucv_message_reply(monpriv->path, &monmsg->msg, | |
222 | IUCV_IPRMDATA, NULL, 0); | |
1da177e4 LT |
223 | atomic_dec(&monpriv->msglim_count); |
224 | if (likely(!monmsg->msglim_reached)) { | |
225 | monmsg->pos = 0; | |
226 | monmsg->mca_offset = 0; | |
227 | monpriv->read_index = (monpriv->read_index + 1) % | |
228 | MON_MSGLIM; | |
229 | atomic_dec(&monpriv->read_ready); | |
230 | } else | |
231 | monmsg->replied_msglim = 1; | |
232 | if (rc) { | |
233 | P_ERROR("read, IUCV reply failed with rc = %i\n\n", rc); | |
234 | return -EIO; | |
235 | } | |
236 | return 0; | |
237 | } | |
238 | ||
9b0c455a | 239 | static void mon_free_mem(struct mon_private *monpriv) |
c667aac8 MS |
240 | { |
241 | int i; | |
242 | ||
243 | for (i = 0; i < MON_MSGLIM; i++) | |
244 | if (monpriv->msg_array[i]) | |
245 | kfree(monpriv->msg_array[i]); | |
246 | kfree(monpriv); | |
247 | } | |
248 | ||
9b0c455a | 249 | static struct mon_private *mon_alloc_mem(void) |
1da177e4 | 250 | { |
c667aac8 | 251 | int i; |
1da177e4 LT |
252 | struct mon_private *monpriv; |
253 | ||
88abaab4 | 254 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); |
1da177e4 LT |
255 | if (!monpriv) { |
256 | P_ERROR("no memory for monpriv\n"); | |
257 | return NULL; | |
258 | } | |
1da177e4 | 259 | for (i = 0; i < MON_MSGLIM; i++) { |
88abaab4 | 260 | monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg), |
1da177e4 LT |
261 | GFP_KERNEL); |
262 | if (!monpriv->msg_array[i]) { | |
263 | P_ERROR("open, no memory for msg_array\n"); | |
c667aac8 | 264 | mon_free_mem(monpriv); |
1da177e4 LT |
265 | return NULL; |
266 | } | |
1da177e4 LT |
267 | } |
268 | return monpriv; | |
269 | } | |
270 | ||
c667aac8 MS |
271 | static inline void mon_read_debug(struct mon_msg *monmsg, |
272 | struct mon_private *monpriv) | |
1da177e4 LT |
273 | { |
274 | #ifdef MON_DEBUG | |
275 | u8 msg_type[2], mca_type; | |
276 | unsigned long records_len; | |
277 | ||
278 | records_len = mon_rec_end(monmsg) - mon_rec_start(monmsg) + 1; | |
279 | ||
c667aac8 | 280 | memcpy(msg_type, &monmsg->msg.class, 2); |
1da177e4 LT |
281 | EBCASC(msg_type, 2); |
282 | mca_type = mon_mca_type(monmsg, 0); | |
283 | EBCASC(&mca_type, 1); | |
284 | ||
285 | P_DEBUG("read, mon_read_index = %i, mon_write_index = %i\n", | |
286 | monpriv->read_index, monpriv->write_index); | |
287 | P_DEBUG("read, pathid = 0x%04X, msgid = 0x%08X, trgcls = 0x%08X\n", | |
c667aac8 | 288 | monpriv->path->pathid, monmsg->msg.id, monmsg->msg.class); |
1da177e4 LT |
289 | P_DEBUG("read, msg_type = '%c%c', mca_type = '%c' / 0x%X / 0x%X\n", |
290 | msg_type[0], msg_type[1], mca_type ? mca_type : 'X', | |
291 | mon_mca_type(monmsg, 1), mon_mca_type(monmsg, 2)); | |
292 | P_DEBUG("read, MCA: start = 0x%lX, end = 0x%lX\n", | |
293 | mon_mca_start(monmsg), mon_mca_end(monmsg)); | |
294 | P_DEBUG("read, REC: start = 0x%X, end = 0x%X, len = %lu\n\n", | |
295 | mon_rec_start(monmsg), mon_rec_end(monmsg), records_len); | |
296 | if (mon_mca_size(monmsg) > 12) | |
297 | P_DEBUG("READ, MORE THAN ONE MCA\n\n"); | |
298 | #endif | |
299 | } | |
300 | ||
c667aac8 | 301 | static inline void mon_next_mca(struct mon_msg *monmsg) |
1da177e4 LT |
302 | { |
303 | if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12)) | |
304 | return; | |
305 | P_DEBUG("READ, NEXT MCA\n\n"); | |
306 | monmsg->mca_offset += 12; | |
307 | monmsg->pos = 0; | |
308 | } | |
309 | ||
9b0c455a | 310 | static struct mon_msg *mon_next_message(struct mon_private *monpriv) |
1da177e4 LT |
311 | { |
312 | struct mon_msg *monmsg; | |
313 | ||
314 | if (!atomic_read(&monpriv->read_ready)) | |
315 | return NULL; | |
316 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
317 | if (unlikely(monmsg->replied_msglim)) { | |
318 | monmsg->replied_msglim = 0; | |
319 | monmsg->msglim_reached = 0; | |
320 | monmsg->pos = 0; | |
321 | monmsg->mca_offset = 0; | |
322 | P_WARNING("read, message limit reached\n"); | |
323 | monpriv->read_index = (monpriv->read_index + 1) % | |
324 | MON_MSGLIM; | |
325 | atomic_dec(&monpriv->read_ready); | |
326 | return ERR_PTR(-EOVERFLOW); | |
327 | } | |
328 | return monmsg; | |
329 | } | |
330 | ||
331 | ||
332 | /****************************************************************************** | |
333 | * IUCV handler * | |
334 | *****************************************************************************/ | |
c667aac8 | 335 | static void mon_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 336 | { |
c667aac8 | 337 | struct mon_private *monpriv = path->private; |
1da177e4 LT |
338 | |
339 | P_DEBUG("IUCV connection completed\n"); | |
340 | P_DEBUG("IUCV ACCEPT (from *MONITOR): Version = 0x%02X, Event = " | |
341 | "0x%02X, Sample = 0x%02X\n", | |
c667aac8 | 342 | ipuser[0], ipuser[1], ipuser[2]); |
1da177e4 LT |
343 | atomic_set(&monpriv->iucv_connected, 1); |
344 | wake_up(&mon_conn_wait_queue); | |
345 | } | |
346 | ||
c667aac8 | 347 | static void mon_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 348 | { |
c667aac8 | 349 | struct mon_private *monpriv = path->private; |
1da177e4 | 350 | |
c667aac8 MS |
351 | P_ERROR("IUCV connection severed with rc = 0x%X\n", ipuser[0]); |
352 | iucv_path_sever(path, NULL); | |
1da177e4 LT |
353 | atomic_set(&monpriv->iucv_severed, 1); |
354 | wake_up(&mon_conn_wait_queue); | |
355 | wake_up_interruptible(&mon_read_wait_queue); | |
356 | } | |
357 | ||
c667aac8 MS |
358 | static void mon_iucv_message_pending(struct iucv_path *path, |
359 | struct iucv_message *msg) | |
1da177e4 | 360 | { |
c667aac8 | 361 | struct mon_private *monpriv = path->private; |
1da177e4 LT |
362 | |
363 | P_DEBUG("IUCV message pending\n"); | |
c667aac8 MS |
364 | memcpy(&monpriv->msg_array[monpriv->write_index]->msg, |
365 | msg, sizeof(*msg)); | |
1da177e4 LT |
366 | if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) { |
367 | P_WARNING("IUCV message pending, message limit (%i) reached\n", | |
368 | MON_MSGLIM); | |
369 | monpriv->msg_array[monpriv->write_index]->msglim_reached = 1; | |
370 | } | |
371 | monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM; | |
372 | atomic_inc(&monpriv->read_ready); | |
373 | wake_up_interruptible(&mon_read_wait_queue); | |
374 | } | |
375 | ||
c667aac8 MS |
376 | static struct iucv_handler monreader_iucv_handler = { |
377 | .path_complete = mon_iucv_path_complete, | |
378 | .path_severed = mon_iucv_path_severed, | |
379 | .message_pending = mon_iucv_message_pending, | |
1da177e4 LT |
380 | }; |
381 | ||
382 | /****************************************************************************** | |
383 | * file operations * | |
384 | *****************************************************************************/ | |
c667aac8 | 385 | static int mon_open(struct inode *inode, struct file *filp) |
1da177e4 | 386 | { |
1da177e4 | 387 | struct mon_private *monpriv; |
c667aac8 | 388 | int rc; |
1da177e4 LT |
389 | |
390 | /* | |
391 | * only one user allowed | |
392 | */ | |
c667aac8 | 393 | rc = -EBUSY; |
1da177e4 | 394 | if (test_and_set_bit(MON_IN_USE, &mon_in_use)) |
c667aac8 | 395 | goto out; |
1da177e4 | 396 | |
c667aac8 | 397 | rc = -ENOMEM; |
1da177e4 LT |
398 | monpriv = mon_alloc_mem(); |
399 | if (!monpriv) | |
c667aac8 | 400 | goto out_use; |
1da177e4 LT |
401 | |
402 | /* | |
c667aac8 | 403 | * Connect to *MONITOR service |
1da177e4 | 404 | */ |
c667aac8 MS |
405 | monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); |
406 | if (!monpriv->path) | |
407 | goto out_priv; | |
408 | rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, | |
409 | MON_SERVICE, NULL, user_data_connect, monpriv); | |
1da177e4 LT |
410 | if (rc) { |
411 | P_ERROR("iucv connection to *MONITOR failed with " | |
412 | "IPUSER SEVER code = %i\n", rc); | |
413 | rc = -EIO; | |
c667aac8 | 414 | goto out_path; |
1da177e4 LT |
415 | } |
416 | /* | |
417 | * Wait for connection confirmation | |
418 | */ | |
419 | wait_event(mon_conn_wait_queue, | |
420 | atomic_read(&monpriv->iucv_connected) || | |
421 | atomic_read(&monpriv->iucv_severed)); | |
422 | if (atomic_read(&monpriv->iucv_severed)) { | |
423 | atomic_set(&monpriv->iucv_severed, 0); | |
424 | atomic_set(&monpriv->iucv_connected, 0); | |
425 | rc = -EIO; | |
c667aac8 | 426 | goto out_path; |
1da177e4 LT |
427 | } |
428 | P_INFO("open, established connection to *MONITOR service\n\n"); | |
429 | filp->private_data = monpriv; | |
430 | return nonseekable_open(inode, filp); | |
431 | ||
c667aac8 MS |
432 | out_path: |
433 | kfree(monpriv->path); | |
434 | out_priv: | |
435 | mon_free_mem(monpriv); | |
436 | out_use: | |
1da177e4 | 437 | clear_bit(MON_IN_USE, &mon_in_use); |
c667aac8 | 438 | out: |
1da177e4 LT |
439 | return rc; |
440 | } | |
441 | ||
c667aac8 | 442 | static int mon_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
443 | { |
444 | int rc, i; | |
445 | struct mon_private *monpriv = filp->private_data; | |
446 | ||
447 | /* | |
448 | * Close IUCV connection and unregister | |
449 | */ | |
c667aac8 | 450 | rc = iucv_path_sever(monpriv->path, user_data_sever); |
1da177e4 LT |
451 | if (rc) |
452 | P_ERROR("close, iucv_sever failed with rc = %i\n", rc); | |
453 | else | |
454 | P_INFO("close, terminated connection to *MONITOR service\n"); | |
455 | ||
1da177e4 LT |
456 | atomic_set(&monpriv->iucv_severed, 0); |
457 | atomic_set(&monpriv->iucv_connected, 0); | |
458 | atomic_set(&monpriv->read_ready, 0); | |
459 | atomic_set(&monpriv->msglim_count, 0); | |
460 | monpriv->write_index = 0; | |
461 | monpriv->read_index = 0; | |
462 | ||
463 | for (i = 0; i < MON_MSGLIM; i++) | |
464 | kfree(monpriv->msg_array[i]); | |
465 | kfree(monpriv); | |
466 | clear_bit(MON_IN_USE, &mon_in_use); | |
467 | return 0; | |
468 | } | |
469 | ||
c667aac8 MS |
470 | static ssize_t mon_read(struct file *filp, char __user *data, |
471 | size_t count, loff_t *ppos) | |
1da177e4 LT |
472 | { |
473 | struct mon_private *monpriv = filp->private_data; | |
474 | struct mon_msg *monmsg; | |
475 | int ret; | |
476 | u32 mce_start; | |
477 | ||
478 | monmsg = mon_next_message(monpriv); | |
479 | if (IS_ERR(monmsg)) | |
480 | return PTR_ERR(monmsg); | |
481 | ||
482 | if (!monmsg) { | |
483 | if (filp->f_flags & O_NONBLOCK) | |
484 | return -EAGAIN; | |
485 | ret = wait_event_interruptible(mon_read_wait_queue, | |
486 | atomic_read(&monpriv->read_ready) || | |
487 | atomic_read(&monpriv->iucv_severed)); | |
488 | if (ret) | |
489 | return ret; | |
490 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
491 | return -EIO; | |
492 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
493 | } | |
494 | ||
495 | if (!monmsg->pos) { | |
496 | monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset; | |
497 | mon_read_debug(monmsg, monpriv); | |
498 | } | |
499 | if (mon_check_mca(monmsg)) | |
500 | goto reply; | |
501 | ||
502 | /* read monitor control element (12 bytes) first */ | |
503 | mce_start = mon_mca_start(monmsg) + monmsg->mca_offset; | |
504 | if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) { | |
505 | count = min(count, (size_t) mce_start + 12 - monmsg->pos); | |
506 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
507 | count); | |
508 | if (ret) | |
509 | return -EFAULT; | |
510 | monmsg->pos += count; | |
511 | if (monmsg->pos == mce_start + 12) | |
512 | monmsg->pos = mon_rec_start(monmsg); | |
513 | goto out_copy; | |
514 | } | |
515 | ||
516 | /* read records */ | |
517 | if (monmsg->pos <= mon_rec_end(monmsg)) { | |
518 | count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos | |
519 | + 1); | |
520 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
521 | count); | |
522 | if (ret) | |
523 | return -EFAULT; | |
524 | monmsg->pos += count; | |
525 | if (monmsg->pos > mon_rec_end(monmsg)) | |
526 | mon_next_mca(monmsg); | |
527 | goto out_copy; | |
528 | } | |
529 | reply: | |
530 | ret = mon_send_reply(monmsg, monpriv); | |
531 | return ret; | |
532 | ||
533 | out_copy: | |
534 | *ppos += count; | |
535 | return count; | |
536 | } | |
537 | ||
c667aac8 | 538 | static unsigned int mon_poll(struct file *filp, struct poll_table_struct *p) |
1da177e4 LT |
539 | { |
540 | struct mon_private *monpriv = filp->private_data; | |
541 | ||
542 | poll_wait(filp, &mon_read_wait_queue, p); | |
543 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
544 | return POLLERR; | |
545 | if (atomic_read(&monpriv->read_ready)) | |
546 | return POLLIN | POLLRDNORM; | |
547 | return 0; | |
548 | } | |
549 | ||
d54b1fdb | 550 | static const struct file_operations mon_fops = { |
1da177e4 LT |
551 | .owner = THIS_MODULE, |
552 | .open = &mon_open, | |
553 | .release = &mon_close, | |
554 | .read = &mon_read, | |
555 | .poll = &mon_poll, | |
556 | }; | |
557 | ||
558 | static struct miscdevice mon_dev = { | |
559 | .name = "monreader", | |
1da177e4 LT |
560 | .fops = &mon_fops, |
561 | .minor = MISC_DYNAMIC_MINOR, | |
562 | }; | |
563 | ||
564 | /****************************************************************************** | |
565 | * module init/exit * | |
566 | *****************************************************************************/ | |
c667aac8 | 567 | static int __init mon_init(void) |
1da177e4 LT |
568 | { |
569 | int rc; | |
570 | ||
571 | if (!MACHINE_IS_VM) { | |
572 | P_ERROR("not running under z/VM, driver not loaded\n"); | |
573 | return -ENODEV; | |
574 | } | |
575 | ||
c667aac8 MS |
576 | /* |
577 | * Register with IUCV and connect to *MONITOR service | |
578 | */ | |
579 | rc = iucv_register(&monreader_iucv_handler, 1); | |
580 | if (rc) { | |
581 | P_ERROR("failed to register with iucv driver\n"); | |
582 | return rc; | |
583 | } | |
584 | P_INFO("open, registered with IUCV\n"); | |
585 | ||
1da177e4 LT |
586 | rc = segment_type(mon_dcss_name); |
587 | if (rc < 0) { | |
588 | mon_segment_warn(rc, mon_dcss_name); | |
c667aac8 | 589 | goto out_iucv; |
1da177e4 LT |
590 | } |
591 | if (rc != SEG_TYPE_SC) { | |
592 | P_ERROR("segment %s has unsupported type, should be SC\n", | |
593 | mon_dcss_name); | |
c667aac8 MS |
594 | rc = -EINVAL; |
595 | goto out_iucv; | |
1da177e4 LT |
596 | } |
597 | ||
598 | rc = segment_load(mon_dcss_name, SEGMENT_SHARED, | |
599 | &mon_dcss_start, &mon_dcss_end); | |
600 | if (rc < 0) { | |
601 | mon_segment_warn(rc, mon_dcss_name); | |
c667aac8 MS |
602 | rc = -EINVAL; |
603 | goto out_iucv; | |
1da177e4 LT |
604 | } |
605 | dcss_mkname(mon_dcss_name, &user_data_connect[8]); | |
606 | ||
607 | rc = misc_register(&mon_dev); | |
608 | if (rc < 0 ) { | |
609 | P_ERROR("misc_register failed, rc = %i\n", rc); | |
610 | goto out; | |
611 | } | |
612 | P_INFO("Loaded segment %s from %p to %p, size = %lu Byte\n", | |
613 | mon_dcss_name, (void *) mon_dcss_start, (void *) mon_dcss_end, | |
614 | mon_dcss_end - mon_dcss_start + 1); | |
615 | return 0; | |
616 | ||
617 | out: | |
618 | segment_unload(mon_dcss_name); | |
c667aac8 MS |
619 | out_iucv: |
620 | iucv_unregister(&monreader_iucv_handler, 1); | |
1da177e4 LT |
621 | return rc; |
622 | } | |
623 | ||
c667aac8 | 624 | static void __exit mon_exit(void) |
1da177e4 LT |
625 | { |
626 | segment_unload(mon_dcss_name); | |
627 | WARN_ON(misc_deregister(&mon_dev) != 0); | |
c667aac8 | 628 | iucv_unregister(&monreader_iucv_handler, 1); |
1da177e4 LT |
629 | return; |
630 | } | |
631 | ||
632 | ||
633 | module_init(mon_init); | |
634 | module_exit(mon_exit); | |
635 | ||
636 | module_param_string(mondcss, mon_dcss_name, 9, 0444); | |
637 | MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR " | |
638 | "service, max. 8 chars. Default is MONDCSS"); | |
639 | ||
640 | MODULE_AUTHOR("Gerald Schaefer <geraldsc@de.ibm.com>"); | |
641 | MODULE_DESCRIPTION("Character device driver for reading z/VM " | |
642 | "monitor service records."); | |
643 | MODULE_LICENSE("GPL"); |