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> | |
6ce46a43 | 15 | #include <linux/smp_lock.h> |
1da177e4 LT |
16 | #include <linux/errno.h> |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/miscdevice.h> | |
20 | #include <linux/ctype.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/interrupt.h> | |
2ca5b6e2 | 23 | #include <linux/poll.h> |
2b1e3e55 | 24 | #include <linux/device.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 | */ | |
6ce46a43 | 286 | lock_kernel(); |
c667aac8 | 287 | rc = -EBUSY; |
1da177e4 | 288 | if (test_and_set_bit(MON_IN_USE, &mon_in_use)) |
c667aac8 | 289 | goto out; |
1da177e4 | 290 | |
c667aac8 | 291 | rc = -ENOMEM; |
1da177e4 LT |
292 | monpriv = mon_alloc_mem(); |
293 | if (!monpriv) | |
c667aac8 | 294 | goto out_use; |
1da177e4 LT |
295 | |
296 | /* | |
c667aac8 | 297 | * Connect to *MONITOR service |
1da177e4 | 298 | */ |
c667aac8 MS |
299 | monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); |
300 | if (!monpriv->path) | |
301 | goto out_priv; | |
302 | rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, | |
303 | MON_SERVICE, NULL, user_data_connect, monpriv); | |
1da177e4 | 304 | if (rc) { |
a4f5a299 GS |
305 | pr_err("Connecting to the z/VM *MONITOR system service " |
306 | "failed with rc=%i\n", rc); | |
1da177e4 | 307 | rc = -EIO; |
c667aac8 | 308 | goto out_path; |
1da177e4 LT |
309 | } |
310 | /* | |
311 | * Wait for connection confirmation | |
312 | */ | |
313 | wait_event(mon_conn_wait_queue, | |
314 | atomic_read(&monpriv->iucv_connected) || | |
315 | atomic_read(&monpriv->iucv_severed)); | |
316 | if (atomic_read(&monpriv->iucv_severed)) { | |
317 | atomic_set(&monpriv->iucv_severed, 0); | |
318 | atomic_set(&monpriv->iucv_connected, 0); | |
319 | rc = -EIO; | |
c667aac8 | 320 | goto out_path; |
1da177e4 | 321 | } |
1da177e4 | 322 | filp->private_data = monpriv; |
2b1e3e55 | 323 | monreader_device->driver_data = monpriv; |
6ce46a43 | 324 | unlock_kernel(); |
1da177e4 LT |
325 | return nonseekable_open(inode, filp); |
326 | ||
c667aac8 | 327 | out_path: |
2b1e3e55 | 328 | iucv_path_free(monpriv->path); |
c667aac8 MS |
329 | out_priv: |
330 | mon_free_mem(monpriv); | |
331 | out_use: | |
1da177e4 | 332 | clear_bit(MON_IN_USE, &mon_in_use); |
c667aac8 | 333 | out: |
6ce46a43 | 334 | unlock_kernel(); |
1da177e4 LT |
335 | return rc; |
336 | } | |
337 | ||
c667aac8 | 338 | static int mon_close(struct inode *inode, struct file *filp) |
1da177e4 LT |
339 | { |
340 | int rc, i; | |
341 | struct mon_private *monpriv = filp->private_data; | |
342 | ||
343 | /* | |
344 | * Close IUCV connection and unregister | |
345 | */ | |
2b1e3e55 GS |
346 | if (monpriv->path) { |
347 | rc = iucv_path_sever(monpriv->path, user_data_sever); | |
348 | if (rc) | |
349 | pr_warning("Disconnecting the z/VM *MONITOR system " | |
350 | "service failed with rc=%i\n", rc); | |
351 | iucv_path_free(monpriv->path); | |
352 | } | |
1da177e4 | 353 | |
1da177e4 LT |
354 | atomic_set(&monpriv->iucv_severed, 0); |
355 | atomic_set(&monpriv->iucv_connected, 0); | |
356 | atomic_set(&monpriv->read_ready, 0); | |
357 | atomic_set(&monpriv->msglim_count, 0); | |
358 | monpriv->write_index = 0; | |
359 | monpriv->read_index = 0; | |
360 | ||
361 | for (i = 0; i < MON_MSGLIM; i++) | |
362 | kfree(monpriv->msg_array[i]); | |
363 | kfree(monpriv); | |
364 | clear_bit(MON_IN_USE, &mon_in_use); | |
365 | return 0; | |
366 | } | |
367 | ||
c667aac8 MS |
368 | static ssize_t mon_read(struct file *filp, char __user *data, |
369 | size_t count, loff_t *ppos) | |
1da177e4 LT |
370 | { |
371 | struct mon_private *monpriv = filp->private_data; | |
372 | struct mon_msg *monmsg; | |
373 | int ret; | |
374 | u32 mce_start; | |
375 | ||
376 | monmsg = mon_next_message(monpriv); | |
377 | if (IS_ERR(monmsg)) | |
378 | return PTR_ERR(monmsg); | |
379 | ||
380 | if (!monmsg) { | |
381 | if (filp->f_flags & O_NONBLOCK) | |
382 | return -EAGAIN; | |
383 | ret = wait_event_interruptible(mon_read_wait_queue, | |
384 | atomic_read(&monpriv->read_ready) || | |
385 | atomic_read(&monpriv->iucv_severed)); | |
386 | if (ret) | |
387 | return ret; | |
388 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
389 | return -EIO; | |
390 | monmsg = monpriv->msg_array[monpriv->read_index]; | |
391 | } | |
392 | ||
2ca5b6e2 | 393 | if (!monmsg->pos) |
1da177e4 | 394 | monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset; |
1da177e4 LT |
395 | if (mon_check_mca(monmsg)) |
396 | goto reply; | |
397 | ||
398 | /* read monitor control element (12 bytes) first */ | |
399 | mce_start = mon_mca_start(monmsg) + monmsg->mca_offset; | |
400 | if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) { | |
401 | count = min(count, (size_t) mce_start + 12 - monmsg->pos); | |
402 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
403 | count); | |
404 | if (ret) | |
405 | return -EFAULT; | |
406 | monmsg->pos += count; | |
407 | if (monmsg->pos == mce_start + 12) | |
408 | monmsg->pos = mon_rec_start(monmsg); | |
409 | goto out_copy; | |
410 | } | |
411 | ||
412 | /* read records */ | |
413 | if (monmsg->pos <= mon_rec_end(monmsg)) { | |
414 | count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos | |
415 | + 1); | |
416 | ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, | |
417 | count); | |
418 | if (ret) | |
419 | return -EFAULT; | |
420 | monmsg->pos += count; | |
421 | if (monmsg->pos > mon_rec_end(monmsg)) | |
422 | mon_next_mca(monmsg); | |
423 | goto out_copy; | |
424 | } | |
425 | reply: | |
426 | ret = mon_send_reply(monmsg, monpriv); | |
427 | return ret; | |
428 | ||
429 | out_copy: | |
430 | *ppos += count; | |
431 | return count; | |
432 | } | |
433 | ||
c667aac8 | 434 | static unsigned int mon_poll(struct file *filp, struct poll_table_struct *p) |
1da177e4 LT |
435 | { |
436 | struct mon_private *monpriv = filp->private_data; | |
437 | ||
438 | poll_wait(filp, &mon_read_wait_queue, p); | |
439 | if (unlikely(atomic_read(&monpriv->iucv_severed))) | |
440 | return POLLERR; | |
441 | if (atomic_read(&monpriv->read_ready)) | |
442 | return POLLIN | POLLRDNORM; | |
443 | return 0; | |
444 | } | |
445 | ||
d54b1fdb | 446 | static const struct file_operations mon_fops = { |
1da177e4 LT |
447 | .owner = THIS_MODULE, |
448 | .open = &mon_open, | |
449 | .release = &mon_close, | |
450 | .read = &mon_read, | |
451 | .poll = &mon_poll, | |
452 | }; | |
453 | ||
454 | static struct miscdevice mon_dev = { | |
455 | .name = "monreader", | |
1da177e4 LT |
456 | .fops = &mon_fops, |
457 | .minor = MISC_DYNAMIC_MINOR, | |
458 | }; | |
459 | ||
2b1e3e55 GS |
460 | |
461 | /****************************************************************************** | |
462 | * suspend / resume * | |
463 | *****************************************************************************/ | |
464 | static int monreader_freeze(struct device *dev) | |
465 | { | |
466 | struct mon_private *monpriv = dev->driver_data; | |
467 | int rc; | |
468 | ||
469 | if (!monpriv) | |
470 | return 0; | |
471 | if (monpriv->path) { | |
472 | rc = iucv_path_sever(monpriv->path, user_data_sever); | |
473 | if (rc) | |
474 | pr_warning("Disconnecting the z/VM *MONITOR system " | |
475 | "service failed with rc=%i\n", rc); | |
476 | iucv_path_free(monpriv->path); | |
477 | } | |
478 | atomic_set(&monpriv->iucv_severed, 0); | |
479 | atomic_set(&monpriv->iucv_connected, 0); | |
480 | atomic_set(&monpriv->read_ready, 0); | |
481 | atomic_set(&monpriv->msglim_count, 0); | |
482 | monpriv->write_index = 0; | |
483 | monpriv->read_index = 0; | |
484 | monpriv->path = NULL; | |
485 | return 0; | |
486 | } | |
487 | ||
488 | static int monreader_thaw(struct device *dev) | |
489 | { | |
490 | struct mon_private *monpriv = dev->driver_data; | |
491 | int rc; | |
492 | ||
493 | if (!monpriv) | |
494 | return 0; | |
495 | rc = -ENOMEM; | |
496 | monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); | |
497 | if (!monpriv->path) | |
498 | goto out; | |
499 | rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, | |
500 | MON_SERVICE, NULL, user_data_connect, monpriv); | |
501 | if (rc) { | |
502 | pr_err("Connecting to the z/VM *MONITOR system service " | |
503 | "failed with rc=%i\n", rc); | |
504 | goto out_path; | |
505 | } | |
506 | wait_event(mon_conn_wait_queue, | |
507 | atomic_read(&monpriv->iucv_connected) || | |
508 | atomic_read(&monpriv->iucv_severed)); | |
509 | if (atomic_read(&monpriv->iucv_severed)) | |
510 | goto out_path; | |
511 | return 0; | |
512 | out_path: | |
513 | rc = -EIO; | |
514 | iucv_path_free(monpriv->path); | |
515 | monpriv->path = NULL; | |
516 | out: | |
517 | atomic_set(&monpriv->iucv_severed, 1); | |
518 | return rc; | |
519 | } | |
520 | ||
521 | static int monreader_restore(struct device *dev) | |
522 | { | |
523 | int rc; | |
524 | ||
525 | segment_unload(mon_dcss_name); | |
526 | rc = segment_load(mon_dcss_name, SEGMENT_SHARED, | |
527 | &mon_dcss_start, &mon_dcss_end); | |
528 | if (rc < 0) { | |
529 | segment_warning(rc, mon_dcss_name); | |
530 | panic("fatal monreader resume error: no monitor dcss\n"); | |
531 | } | |
532 | return monreader_thaw(dev); | |
533 | } | |
534 | ||
535 | static struct dev_pm_ops monreader_pm_ops = { | |
536 | .freeze = monreader_freeze, | |
537 | .thaw = monreader_thaw, | |
538 | .restore = monreader_restore, | |
539 | }; | |
540 | ||
541 | static struct device_driver monreader_driver = { | |
542 | .name = "monreader", | |
543 | .bus = &iucv_bus, | |
544 | .pm = &monreader_pm_ops, | |
545 | }; | |
546 | ||
547 | ||
1da177e4 LT |
548 | /****************************************************************************** |
549 | * module init/exit * | |
550 | *****************************************************************************/ | |
c667aac8 | 551 | static int __init mon_init(void) |
1da177e4 LT |
552 | { |
553 | int rc; | |
554 | ||
555 | if (!MACHINE_IS_VM) { | |
a4f5a299 GS |
556 | pr_err("The z/VM *MONITOR record device driver cannot be " |
557 | "loaded without z/VM\n"); | |
1da177e4 LT |
558 | return -ENODEV; |
559 | } | |
560 | ||
c667aac8 MS |
561 | /* |
562 | * Register with IUCV and connect to *MONITOR service | |
563 | */ | |
564 | rc = iucv_register(&monreader_iucv_handler, 1); | |
565 | if (rc) { | |
a4f5a299 GS |
566 | pr_err("The z/VM *MONITOR record device driver failed to " |
567 | "register with IUCV\n"); | |
c667aac8 MS |
568 | return rc; |
569 | } | |
c667aac8 | 570 | |
2b1e3e55 GS |
571 | rc = driver_register(&monreader_driver); |
572 | if (rc) | |
573 | goto out_iucv; | |
574 | monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL); | |
575 | if (!monreader_device) | |
576 | goto out_driver; | |
577 | dev_set_name(monreader_device, "monreader-dev"); | |
578 | monreader_device->bus = &iucv_bus; | |
579 | monreader_device->parent = iucv_root; | |
580 | monreader_device->driver = &monreader_driver; | |
581 | monreader_device->release = (void (*)(struct device *))kfree; | |
582 | rc = device_register(monreader_device); | |
583 | if (rc) { | |
584 | kfree(monreader_device); | |
585 | goto out_driver; | |
586 | } | |
587 | ||
1da177e4 LT |
588 | rc = segment_type(mon_dcss_name); |
589 | if (rc < 0) { | |
ca68305b | 590 | segment_warning(rc, mon_dcss_name); |
2b1e3e55 | 591 | goto out_device; |
1da177e4 LT |
592 | } |
593 | if (rc != SEG_TYPE_SC) { | |
a4f5a299 GS |
594 | pr_err("The specified *MONITOR DCSS %s does not have the " |
595 | "required type SC\n", mon_dcss_name); | |
c667aac8 | 596 | rc = -EINVAL; |
2b1e3e55 | 597 | goto out_device; |
1da177e4 LT |
598 | } |
599 | ||
600 | rc = segment_load(mon_dcss_name, SEGMENT_SHARED, | |
601 | &mon_dcss_start, &mon_dcss_end); | |
602 | if (rc < 0) { | |
ca68305b | 603 | segment_warning(rc, mon_dcss_name); |
c667aac8 | 604 | rc = -EINVAL; |
2b1e3e55 | 605 | goto out_device; |
1da177e4 LT |
606 | } |
607 | dcss_mkname(mon_dcss_name, &user_data_connect[8]); | |
608 | ||
609 | rc = misc_register(&mon_dev); | |
2ca5b6e2 | 610 | if (rc < 0 ) |
1da177e4 | 611 | goto out; |
1da177e4 LT |
612 | return 0; |
613 | ||
614 | out: | |
615 | segment_unload(mon_dcss_name); | |
2b1e3e55 GS |
616 | out_device: |
617 | device_unregister(monreader_device); | |
618 | out_driver: | |
619 | driver_unregister(&monreader_driver); | |
c667aac8 MS |
620 | out_iucv: |
621 | iucv_unregister(&monreader_iucv_handler, 1); | |
1da177e4 LT |
622 | return rc; |
623 | } | |
624 | ||
c667aac8 | 625 | static void __exit mon_exit(void) |
1da177e4 LT |
626 | { |
627 | segment_unload(mon_dcss_name); | |
628 | WARN_ON(misc_deregister(&mon_dev) != 0); | |
2b1e3e55 GS |
629 | device_unregister(monreader_device); |
630 | driver_unregister(&monreader_driver); | |
c667aac8 | 631 | iucv_unregister(&monreader_iucv_handler, 1); |
1da177e4 LT |
632 | return; |
633 | } | |
634 | ||
635 | ||
636 | module_init(mon_init); | |
637 | module_exit(mon_exit); | |
638 | ||
639 | module_param_string(mondcss, mon_dcss_name, 9, 0444); | |
640 | MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR " | |
641 | "service, max. 8 chars. Default is MONDCSS"); | |
642 | ||
643 | MODULE_AUTHOR("Gerald Schaefer <geraldsc@de.ibm.com>"); | |
644 | MODULE_DESCRIPTION("Character device driver for reading z/VM " | |
645 | "monitor service records."); | |
646 | MODULE_LICENSE("GPL"); |