Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Character device driver for reading z/VM *MONITOR service records. |
3 | * | |
2b1e3e55 GS |
4 | * Copyright IBM Corp. 2004, 2009 |
5 | * | |
6 | * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> | |
1da177e4 LT |
7 | */ |
8 | ||
a4f5a299 GS |
9 | #define KMSG_COMPONENT "monreader" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/moduleparam.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/miscdevice.h> | |
19 | #include <linux/ctype.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/interrupt.h> | |
2ca5b6e2 | 22 | #include <linux/poll.h> |
2b1e3e55 | 23 | #include <linux/device.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
2ca5b6e2 | 25 | #include <net/iucv/iucv.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/ebcdic.h> | |
28 | #include <asm/extmem.h> | |
1da177e4 | 29 | |
1da177e4 LT |
30 | |
31 | #define MON_COLLECT_SAMPLE 0x80 | |
32 | #define MON_COLLECT_EVENT 0x40 | |
33 | #define MON_SERVICE "*MONITOR" | |
34 | #define MON_IN_USE 0x01 | |
35 | #define MON_MSGLIM 255 | |
36 | ||
37 | static char mon_dcss_name[9] = "MONDCSS\0"; | |
38 | ||
39 | struct mon_msg { | |
40 | u32 pos; | |
41 | u32 mca_offset; | |
c667aac8 | 42 | struct iucv_message msg; |
1da177e4 LT |
43 | char msglim_reached; |
44 | char replied_msglim; | |
45 | }; | |
46 | ||
47 | struct mon_private { | |
c667aac8 | 48 | struct iucv_path *path; |
1da177e4 LT |
49 | struct mon_msg *msg_array[MON_MSGLIM]; |
50 | unsigned int write_index; | |
51 | unsigned int read_index; | |
52 | atomic_t msglim_count; | |
53 | atomic_t read_ready; | |
54 | atomic_t iucv_connected; | |
55 | atomic_t iucv_severed; | |
56 | }; | |
57 | ||
58 | static unsigned long mon_in_use = 0; | |
59 | ||
60 | static unsigned long mon_dcss_start; | |
61 | static unsigned long mon_dcss_end; | |
62 | ||
63 | static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue); | |
64 | static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue); | |
65 | ||
1da177e4 LT |
66 | static u8 user_data_connect[16] = { |
67 | /* Version code, must be 0x01 for shared mode */ | |
68 | 0x01, | |
69 | /* what to collect */ | |
70 | MON_COLLECT_SAMPLE | MON_COLLECT_EVENT, | |
71 | /* DCSS name in EBCDIC, 8 bytes padded with blanks */ | |
72 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
73 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
74 | }; | |
75 | ||
76 | static u8 user_data_sever[16] = { | |
77 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
78 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | |
79 | }; | |
80 | ||
2b1e3e55 | 81 | static struct device *monreader_device; |
1da177e4 LT |
82 | |
83 | /****************************************************************************** | |
84 | * helper functions * | |
85 | *****************************************************************************/ | |
86 | /* | |
87 | * Create the 8 bytes EBCDIC DCSS segment name from | |
88 | * an ASCII name, incl. padding | |
89 | */ | |
9b0c455a | 90 | static void dcss_mkname(char *ascii_name, char *ebcdic_name) |
1da177e4 LT |
91 | { |
92 | int i; | |
93 | ||
94 | for (i = 0; i < 8; i++) { | |
95 | if (ascii_name[i] == '\0') | |
96 | break; | |
97 | ebcdic_name[i] = toupper(ascii_name[i]); | |
98 | }; | |
99 | for (; i < 8; i++) | |
100 | ebcdic_name[i] = ' '; | |
101 | ASCEBC(ebcdic_name, 8); | |
102 | } | |
103 | ||
c667aac8 | 104 | static inline unsigned long mon_mca_start(struct mon_msg *monmsg) |
1da177e4 | 105 | { |
c667aac8 | 106 | return *(u32 *) &monmsg->msg.rmmsg; |
1da177e4 LT |
107 | } |
108 | ||
c667aac8 | 109 | static inline unsigned long mon_mca_end(struct mon_msg *monmsg) |
1da177e4 | 110 | { |
c667aac8 | 111 | return *(u32 *) &monmsg->msg.rmmsg[4]; |
1da177e4 LT |
112 | } |
113 | ||
c667aac8 | 114 | static inline u8 mon_mca_type(struct mon_msg *monmsg, u8 index) |
1da177e4 LT |
115 | { |
116 | return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index); | |
117 | } | |
118 | ||
c667aac8 | 119 | static inline u32 mon_mca_size(struct mon_msg *monmsg) |
1da177e4 LT |
120 | { |
121 | return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1; | |
122 | } | |
123 | ||
c667aac8 | 124 | static inline u32 mon_rec_start(struct mon_msg *monmsg) |
1da177e4 LT |
125 | { |
126 | return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4)); | |
127 | } | |
128 | ||
c667aac8 | 129 | static inline u32 mon_rec_end(struct mon_msg *monmsg) |
1da177e4 LT |
130 | { |
131 | return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8)); | |
132 | } | |
133 | ||
9b0c455a | 134 | static int mon_check_mca(struct mon_msg *monmsg) |
1da177e4 LT |
135 | { |
136 | if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) || | |
137 | (mon_rec_start(monmsg) < mon_dcss_start) || | |
138 | (mon_rec_end(monmsg) > mon_dcss_end) || | |
139 | (mon_mca_type(monmsg, 0) == 0) || | |
140 | (mon_mca_size(monmsg) % 12 != 0) || | |
141 | (mon_mca_end(monmsg) <= mon_mca_start(monmsg)) || | |
142 | (mon_mca_end(monmsg) > mon_dcss_end) || | |
143 | (mon_mca_start(monmsg) < mon_dcss_start) || | |
144 | ((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0))) | |
1da177e4 | 145 | return -EINVAL; |
1da177e4 LT |
146 | return 0; |
147 | } | |
148 | ||
9b0c455a MS |
149 | static int mon_send_reply(struct mon_msg *monmsg, |
150 | struct mon_private *monpriv) | |
1da177e4 | 151 | { |
1da177e4 LT |
152 | int rc; |
153 | ||
c667aac8 MS |
154 | rc = iucv_message_reply(monpriv->path, &monmsg->msg, |
155 | IUCV_IPRMDATA, NULL, 0); | |
1da177e4 LT |
156 | atomic_dec(&monpriv->msglim_count); |
157 | if (likely(!monmsg->msglim_reached)) { | |
158 | monmsg->pos = 0; | |
159 | monmsg->mca_offset = 0; | |
160 | monpriv->read_index = (monpriv->read_index + 1) % | |
161 | MON_MSGLIM; | |
162 | atomic_dec(&monpriv->read_ready); | |
163 | } else | |
164 | monmsg->replied_msglim = 1; | |
165 | if (rc) { | |
a4f5a299 | 166 | pr_err("Reading monitor data failed with rc=%i\n", rc); |
1da177e4 LT |
167 | return -EIO; |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
9b0c455a | 172 | static void mon_free_mem(struct mon_private *monpriv) |
c667aac8 MS |
173 | { |
174 | int i; | |
175 | ||
176 | for (i = 0; i < MON_MSGLIM; i++) | |
177 | if (monpriv->msg_array[i]) | |
178 | kfree(monpriv->msg_array[i]); | |
179 | kfree(monpriv); | |
180 | } | |
181 | ||
9b0c455a | 182 | static struct mon_private *mon_alloc_mem(void) |
1da177e4 | 183 | { |
c667aac8 | 184 | int i; |
1da177e4 LT |
185 | struct mon_private *monpriv; |
186 | ||
88abaab4 | 187 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); |
2ca5b6e2 | 188 | if (!monpriv) |
1da177e4 | 189 | return NULL; |
1da177e4 | 190 | for (i = 0; i < MON_MSGLIM; i++) { |
88abaab4 | 191 | monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg), |
1da177e4 LT |
192 | GFP_KERNEL); |
193 | if (!monpriv->msg_array[i]) { | |
c667aac8 | 194 | mon_free_mem(monpriv); |
1da177e4 LT |
195 | return NULL; |
196 | } | |
1da177e4 LT |
197 | } |
198 | return monpriv; | |
199 | } | |
200 | ||
c667aac8 | 201 | static inline void mon_next_mca(struct mon_msg *monmsg) |
1da177e4 LT |
202 | { |
203 | if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12)) | |
204 | return; | |
1da177e4 LT |
205 | monmsg->mca_offset += 12; |
206 | monmsg->pos = 0; | |
207 | } | |
208 | ||
9b0c455a | 209 | static struct mon_msg *mon_next_message(struct mon_private *monpriv) |
1da177e4 LT |
210 | { |
211 | struct mon_msg *monmsg; | |
212 | ||
213 | if (!atomic_read(&monpriv->read_ready)) | |
214 | return NULL; | |
215 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
216 | if (unlikely(monmsg->replied_msglim)) { | |
217 | monmsg->replied_msglim = 0; | |
218 | monmsg->msglim_reached = 0; | |
219 | monmsg->pos = 0; | |
220 | monmsg->mca_offset = 0; | |
1da177e4 LT |
221 | monpriv->read_index = (monpriv->read_index + 1) % |
222 | MON_MSGLIM; | |
223 | atomic_dec(&monpriv->read_ready); | |
224 | return ERR_PTR(-EOVERFLOW); | |
225 | } | |
226 | return monmsg; | |
227 | } | |
228 | ||
229 | ||
230 | /****************************************************************************** | |
231 | * IUCV handler * | |
232 | *****************************************************************************/ | |
c667aac8 | 233 | static void mon_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 234 | { |
c667aac8 | 235 | struct mon_private *monpriv = path->private; |
1da177e4 | 236 | |
1da177e4 LT |
237 | atomic_set(&monpriv->iucv_connected, 1); |
238 | wake_up(&mon_conn_wait_queue); | |
239 | } | |
240 | ||
c667aac8 | 241 | static void mon_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
1da177e4 | 242 | { |
c667aac8 | 243 | struct mon_private *monpriv = path->private; |
1da177e4 | 244 | |
a4f5a299 GS |
245 | pr_err("z/VM *MONITOR system service disconnected with rc=%i\n", |
246 | ipuser[0]); | |
c667aac8 | 247 | iucv_path_sever(path, NULL); |
1da177e4 LT |
248 | atomic_set(&monpriv->iucv_severed, 1); |
249 | wake_up(&mon_conn_wait_queue); | |
250 | wake_up_interruptible(&mon_read_wait_queue); | |
251 | } | |
252 | ||
c667aac8 MS |
253 | static void mon_iucv_message_pending(struct iucv_path *path, |
254 | struct iucv_message *msg) | |
1da177e4 | 255 | { |
c667aac8 | 256 | struct mon_private *monpriv = path->private; |
1da177e4 | 257 | |
c667aac8 MS |
258 | memcpy(&monpriv->msg_array[monpriv->write_index]->msg, |
259 | msg, sizeof(*msg)); | |
1da177e4 | 260 | if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) { |
a4f5a299 | 261 | pr_warning("The read queue for monitor data is full\n"); |
1da177e4 LT |
262 | monpriv->msg_array[monpriv->write_index]->msglim_reached = 1; |
263 | } | |
264 | monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM; | |
265 | atomic_inc(&monpriv->read_ready); | |
266 | wake_up_interruptible(&mon_read_wait_queue); | |
267 | } | |
268 | ||
c667aac8 MS |
269 | static struct iucv_handler monreader_iucv_handler = { |
270 | .path_complete = mon_iucv_path_complete, | |
271 | .path_severed = mon_iucv_path_severed, | |
272 | .message_pending = mon_iucv_message_pending, | |
1da177e4 LT |
273 | }; |
274 | ||
275 | /****************************************************************************** | |
276 | * file operations * | |
277 | *****************************************************************************/ | |
c667aac8 | 278 | static int mon_open(struct inode *inode, struct file *filp) |
1da177e4 | 279 | { |
1da177e4 | 280 | struct mon_private *monpriv; |
c667aac8 | 281 | int rc; |
1da177e4 LT |
282 | |
283 | /* | |
284 | * only one user allowed | |
285 | */ | |
c667aac8 | 286 | rc = -EBUSY; |
1da177e4 | 287 | if (test_and_set_bit(MON_IN_USE, &mon_in_use)) |
c667aac8 | 288 | goto out; |
1da177e4 | 289 | |
c667aac8 | 290 | rc = -ENOMEM; |
1da177e4 LT |
291 | monpriv = mon_alloc_mem(); |
292 | if (!monpriv) | |
c667aac8 | 293 | goto out_use; |
1da177e4 LT |
294 | |
295 | /* | |
c667aac8 | 296 | * Connect to *MONITOR service |
1da177e4 | 297 | */ |
c667aac8 MS |
298 | monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); |
299 | if (!monpriv->path) | |
300 | goto out_priv; | |
301 | rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, | |
302 | MON_SERVICE, NULL, user_data_connect, monpriv); | |
1da177e4 | 303 | if (rc) { |
a4f5a299 GS |
304 | pr_err("Connecting to the z/VM *MONITOR system service " |
305 | "failed with rc=%i\n", rc); | |
1da177e4 | 306 | rc = -EIO; |
c667aac8 | 307 | goto out_path; |
1da177e4 LT |
308 | } |
309 | /* | |
310 | * Wait for connection confirmation | |
311 | */ | |
312 | wait_event(mon_conn_wait_queue, | |
313 | atomic_read(&monpriv->iucv_connected) || | |
314 | atomic_read(&monpriv->iucv_severed)); | |
315 | if (atomic_read(&monpriv->iucv_severed)) { | |
316 | atomic_set(&monpriv->iucv_severed, 0); | |
317 | atomic_set(&monpriv->iucv_connected, 0); | |
318 | rc = -EIO; | |
c667aac8 | 319 | goto out_path; |
1da177e4 | 320 | } |
1da177e4 | 321 | filp->private_data = monpriv; |
99357742 | 322 | dev_set_drvdata(monreader_device, monpriv); |
1da177e4 LT |
323 | return nonseekable_open(inode, filp); |
324 | ||
c667aac8 | 325 | out_path: |
2b1e3e55 | 326 | iucv_path_free(monpriv->path); |
c667aac8 MS |
327 | out_priv: |
328 | mon_free_mem(monpriv); | |
329 | out_use: | |
1da177e4 | 330 | clear_bit(MON_IN_USE, &mon_in_use); |
c667aac8 | 331 | out: |
1da177e4 LT |
332 | return rc; |
333 | } | |
334 | ||
c667aac8 | 335 | static int mon_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
336 | { |
337 | int rc, i; | |
338 | struct mon_private *monpriv = filp->private_data; | |
339 | ||
340 | /* | |
341 | * Close IUCV connection and unregister | |
342 | */ | |
2b1e3e55 GS |
343 | if (monpriv->path) { |
344 | rc = iucv_path_sever(monpriv->path, user_data_sever); | |
345 | if (rc) | |
346 | pr_warning("Disconnecting the z/VM *MONITOR system " | |
347 | "service failed with rc=%i\n", rc); | |
348 | iucv_path_free(monpriv->path); | |
349 | } | |
1da177e4 | 350 | |
1da177e4 LT |
351 | atomic_set(&monpriv->iucv_severed, 0); |
352 | atomic_set(&monpriv->iucv_connected, 0); | |
353 | atomic_set(&monpriv->read_ready, 0); | |
354 | atomic_set(&monpriv->msglim_count, 0); | |
355 | monpriv->write_index = 0; | |
356 | monpriv->read_index = 0; | |
ccaf6553 | 357 | dev_set_drvdata(monreader_device, NULL); |
1da177e4 LT |
358 | |
359 | for (i = 0; i < MON_MSGLIM; i++) | |
360 | kfree(monpriv->msg_array[i]); | |
361 | kfree(monpriv); | |
362 | clear_bit(MON_IN_USE, &mon_in_use); | |
363 | return 0; | |
364 | } | |
365 | ||
c667aac8 MS |
366 | static ssize_t mon_read(struct file *filp, char __user *data, |
367 | size_t count, loff_t *ppos) | |
1da177e4 LT |
368 | { |
369 | struct mon_private *monpriv = filp->private_data; | |
370 | struct mon_msg *monmsg; | |
371 | int ret; | |
372 | u32 mce_start; | |
373 | ||
374 | monmsg = mon_next_message(monpriv); | |
375 | if (IS_ERR(monmsg)) | |
376 | return PTR_ERR(monmsg); | |
377 | ||
378 | if (!monmsg) { | |
379 | if (filp->f_flags & O_NONBLOCK) | |
380 | return -EAGAIN; | |
381 | ret = wait_event_interruptible(mon_read_wait_queue, | |
382 | atomic_read(&monpriv->read_ready) || | |
383 | atomic_read(&monpriv->iucv_severed)); | |
384 | if (ret) | |
385 | return ret; | |
386 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
387 | return -EIO; | |
388 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
389 | } | |
390 | ||
2ca5b6e2 | 391 | if (!monmsg->pos) |
1da177e4 | 392 | monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset; |
1da177e4 LT |
393 | if (mon_check_mca(monmsg)) |
394 | goto reply; | |
395 | ||
396 | /* read monitor control element (12 bytes) first */ | |
397 | mce_start = mon_mca_start(monmsg) + monmsg->mca_offset; | |
398 | if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) { | |
399 | count = min(count, (size_t) mce_start + 12 - monmsg->pos); | |
400 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
401 | count); | |
402 | if (ret) | |
403 | return -EFAULT; | |
404 | monmsg->pos += count; | |
405 | if (monmsg->pos == mce_start + 12) | |
406 | monmsg->pos = mon_rec_start(monmsg); | |
407 | goto out_copy; | |
408 | } | |
409 | ||
410 | /* read records */ | |
411 | if (monmsg->pos <= mon_rec_end(monmsg)) { | |
412 | count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos | |
413 | + 1); | |
414 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
415 | count); | |
416 | if (ret) | |
417 | return -EFAULT; | |
418 | monmsg->pos += count; | |
419 | if (monmsg->pos > mon_rec_end(monmsg)) | |
420 | mon_next_mca(monmsg); | |
421 | goto out_copy; | |
422 | } | |
423 | reply: | |
424 | ret = mon_send_reply(monmsg, monpriv); | |
425 | return ret; | |
426 | ||
427 | out_copy: | |
428 | *ppos += count; | |
429 | return count; | |
430 | } | |
431 | ||
c667aac8 | 432 | static unsigned int mon_poll(struct file *filp, struct poll_table_struct *p) |
1da177e4 LT |
433 | { |
434 | struct mon_private *monpriv = filp->private_data; | |
435 | ||
436 | poll_wait(filp, &mon_read_wait_queue, p); | |
437 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
438 | return POLLERR; | |
439 | if (atomic_read(&monpriv->read_ready)) | |
440 | return POLLIN | POLLRDNORM; | |
441 | return 0; | |
442 | } | |
443 | ||
d54b1fdb | 444 | static const struct file_operations mon_fops = { |
1da177e4 LT |
445 | .owner = THIS_MODULE, |
446 | .open = &mon_open, | |
447 | .release = &mon_close, | |
448 | .read = &mon_read, | |
449 | .poll = &mon_poll, | |
6038f373 | 450 | .llseek = noop_llseek, |
1da177e4 LT |
451 | }; |
452 | ||
453 | static struct miscdevice mon_dev = { | |
454 | .name = "monreader", | |
1da177e4 LT |
455 | .fops = &mon_fops, |
456 | .minor = MISC_DYNAMIC_MINOR, | |
457 | }; | |
458 | ||
2b1e3e55 GS |
459 | |
460 | /****************************************************************************** | |
461 | * suspend / resume * | |
462 | *****************************************************************************/ | |
463 | static int monreader_freeze(struct device *dev) | |
464 | { | |
99357742 | 465 | struct mon_private *monpriv = dev_get_drvdata(dev); |
2b1e3e55 GS |
466 | int rc; |
467 | ||
468 | if (!monpriv) | |
469 | return 0; | |
470 | if (monpriv->path) { | |
471 | rc = iucv_path_sever(monpriv->path, user_data_sever); | |
472 | if (rc) | |
473 | pr_warning("Disconnecting the z/VM *MONITOR system " | |
474 | "service failed with rc=%i\n", rc); | |
475 | iucv_path_free(monpriv->path); | |
476 | } | |
477 | atomic_set(&monpriv->iucv_severed, 0); | |
478 | atomic_set(&monpriv->iucv_connected, 0); | |
479 | atomic_set(&monpriv->read_ready, 0); | |
480 | atomic_set(&monpriv->msglim_count, 0); | |
481 | monpriv->write_index = 0; | |
482 | monpriv->read_index = 0; | |
483 | monpriv->path = NULL; | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static int monreader_thaw(struct device *dev) | |
488 | { | |
4f0076f7 | 489 | struct mon_private *monpriv = dev_get_drvdata(dev); |
2b1e3e55 GS |
490 | int rc; |
491 | ||
492 | if (!monpriv) | |
493 | return 0; | |
494 | rc = -ENOMEM; | |
495 | monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); | |
496 | if (!monpriv->path) | |
497 | goto out; | |
498 | rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, | |
499 | MON_SERVICE, NULL, user_data_connect, monpriv); | |
500 | if (rc) { | |
501 | pr_err("Connecting to the z/VM *MONITOR system service " | |
502 | "failed with rc=%i\n", rc); | |
503 | goto out_path; | |
504 | } | |
505 | wait_event(mon_conn_wait_queue, | |
506 | atomic_read(&monpriv->iucv_connected) || | |
507 | atomic_read(&monpriv->iucv_severed)); | |
508 | if (atomic_read(&monpriv->iucv_severed)) | |
509 | goto out_path; | |
510 | return 0; | |
511 | out_path: | |
512 | rc = -EIO; | |
513 | iucv_path_free(monpriv->path); | |
514 | monpriv->path = NULL; | |
515 | out: | |
516 | atomic_set(&monpriv->iucv_severed, 1); | |
517 | return rc; | |
518 | } | |
519 | ||
520 | static int monreader_restore(struct device *dev) | |
521 | { | |
522 | int rc; | |
523 | ||
524 | segment_unload(mon_dcss_name); | |
525 | rc = segment_load(mon_dcss_name, SEGMENT_SHARED, | |
526 | &mon_dcss_start, &mon_dcss_end); | |
527 | if (rc < 0) { | |
528 | segment_warning(rc, mon_dcss_name); | |
529 | panic("fatal monreader resume error: no monitor dcss\n"); | |
530 | } | |
531 | return monreader_thaw(dev); | |
532 | } | |
533 | ||
47145210 | 534 | static const struct dev_pm_ops monreader_pm_ops = { |
2b1e3e55 GS |
535 | .freeze = monreader_freeze, |
536 | .thaw = monreader_thaw, | |
537 | .restore = monreader_restore, | |
538 | }; | |
539 | ||
540 | static struct device_driver monreader_driver = { | |
541 | .name = "monreader", | |
542 | .bus = &iucv_bus, | |
543 | .pm = &monreader_pm_ops, | |
544 | }; | |
545 | ||
546 | ||
1da177e4 LT |
547 | /****************************************************************************** |
548 | * module init/exit * | |
549 | *****************************************************************************/ | |
c667aac8 | 550 | static int __init mon_init(void) |
1da177e4 LT |
551 | { |
552 | int rc; | |
553 | ||
554 | if (!MACHINE_IS_VM) { | |
a4f5a299 GS |
555 | pr_err("The z/VM *MONITOR record device driver cannot be " |
556 | "loaded without z/VM\n"); | |
1da177e4 LT |
557 | return -ENODEV; |
558 | } | |
559 | ||
c667aac8 MS |
560 | /* |
561 | * Register with IUCV and connect to *MONITOR service | |
562 | */ | |
563 | rc = iucv_register(&monreader_iucv_handler, 1); | |
564 | if (rc) { | |
a4f5a299 GS |
565 | pr_err("The z/VM *MONITOR record device driver failed to " |
566 | "register with IUCV\n"); | |
c667aac8 MS |
567 | return rc; |
568 | } | |
c667aac8 | 569 | |
2b1e3e55 GS |
570 | rc = driver_register(&monreader_driver); |
571 | if (rc) | |
572 | goto out_iucv; | |
573 | monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL); | |
574 | if (!monreader_device) | |
575 | goto out_driver; | |
576 | dev_set_name(monreader_device, "monreader-dev"); | |
577 | monreader_device->bus = &iucv_bus; | |
578 | monreader_device->parent = iucv_root; | |
579 | monreader_device->driver = &monreader_driver; | |
580 | monreader_device->release = (void (*)(struct device *))kfree; | |
581 | rc = device_register(monreader_device); | |
582 | if (rc) { | |
c6304933 | 583 | put_device(monreader_device); |
2b1e3e55 GS |
584 | goto out_driver; |
585 | } | |
586 | ||
1da177e4 LT |
587 | rc = segment_type(mon_dcss_name); |
588 | if (rc < 0) { | |
ca68305b | 589 | segment_warning(rc, mon_dcss_name); |
2b1e3e55 | 590 | goto out_device; |
1da177e4 LT |
591 | } |
592 | if (rc != SEG_TYPE_SC) { | |
a4f5a299 GS |
593 | pr_err("The specified *MONITOR DCSS %s does not have the " |
594 | "required type SC\n", mon_dcss_name); | |
c667aac8 | 595 | rc = -EINVAL; |
2b1e3e55 | 596 | goto out_device; |
1da177e4 LT |
597 | } |
598 | ||
599 | rc = segment_load(mon_dcss_name, SEGMENT_SHARED, | |
600 | &mon_dcss_start, &mon_dcss_end); | |
601 | if (rc < 0) { | |
ca68305b | 602 | segment_warning(rc, mon_dcss_name); |
c667aac8 | 603 | rc = -EINVAL; |
2b1e3e55 | 604 | goto out_device; |
1da177e4 LT |
605 | } |
606 | dcss_mkname(mon_dcss_name, &user_data_connect[8]); | |
607 | ||
1963403a GS |
608 | /* |
609 | * misc_register() has to be the last action in module_init(), because | |
610 | * file operations will be available right after this. | |
611 | */ | |
1da177e4 | 612 | rc = misc_register(&mon_dev); |
2ca5b6e2 | 613 | if (rc < 0 ) |
1da177e4 | 614 | goto out; |
1da177e4 LT |
615 | return 0; |
616 | ||
617 | out: | |
618 | segment_unload(mon_dcss_name); | |
2b1e3e55 GS |
619 | out_device: |
620 | device_unregister(monreader_device); | |
621 | out_driver: | |
622 | driver_unregister(&monreader_driver); | |
c667aac8 MS |
623 | out_iucv: |
624 | iucv_unregister(&monreader_iucv_handler, 1); | |
1da177e4 LT |
625 | return rc; |
626 | } | |
627 | ||
c667aac8 | 628 | static void __exit mon_exit(void) |
1da177e4 LT |
629 | { |
630 | segment_unload(mon_dcss_name); | |
547415d5 | 631 | misc_deregister(&mon_dev); |
2b1e3e55 GS |
632 | device_unregister(monreader_device); |
633 | driver_unregister(&monreader_driver); | |
c667aac8 | 634 | iucv_unregister(&monreader_iucv_handler, 1); |
1da177e4 LT |
635 | return; |
636 | } | |
637 | ||
638 | ||
639 | module_init(mon_init); | |
640 | module_exit(mon_exit); | |
641 | ||
642 | module_param_string(mondcss, mon_dcss_name, 9, 0444); | |
643 | MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR " | |
644 | "service, max. 8 chars. Default is MONDCSS"); | |
645 | ||
646 | MODULE_AUTHOR("Gerald Schaefer <geraldsc@de.ibm.com>"); | |
647 | MODULE_DESCRIPTION("Character device driver for reading z/VM " | |
648 | "monitor service records."); | |
649 | MODULE_LICENSE("GPL"); |