Commit | Line | Data |
---|---|---|
31b58088 | 1 | /* |
31b58088 MH |
2 | * Character device driver for writing z/VM *MONITOR service records. |
3 | * | |
fb78140c | 4 | * Copyright IBM Corp. 2006, 2009 |
31b58088 MH |
5 | * |
6 | * Author(s): Melissa Howland <Melissa.Howland@us.ibm.com> | |
7 | */ | |
8 | ||
1519c0c6 MH |
9 | #define KMSG_COMPONENT "monwriter" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
31b58088 MH |
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/poll.h> | |
cbea66d9 | 21 | #include <linux/mutex.h> |
fb78140c | 22 | #include <linux/platform_device.h> |
31b58088 MH |
23 | #include <asm/uaccess.h> |
24 | #include <asm/ebcdic.h> | |
25 | #include <asm/io.h> | |
26 | #include <asm/appldata.h> | |
27 | #include <asm/monwriter.h> | |
28 | ||
524a237e | 29 | #define MONWRITE_MAX_DATALEN 4010 |
31b58088 MH |
30 | |
31 | static int mon_max_bufs = 255; | |
2d103d5a | 32 | static int mon_buf_count; |
31b58088 MH |
33 | |
34 | struct mon_buf { | |
35 | struct list_head list; | |
36 | struct monwrite_hdr hdr; | |
37 | int diag_done; | |
38 | char *data; | |
39 | }; | |
40 | ||
fb78140c GS |
41 | static LIST_HEAD(mon_priv_list); |
42 | ||
31b58088 | 43 | struct mon_private { |
fb78140c | 44 | struct list_head priv_list; |
31b58088 MH |
45 | struct list_head list; |
46 | struct monwrite_hdr hdr; | |
47 | size_t hdr_to_read; | |
48 | size_t data_to_read; | |
49 | struct mon_buf *current_buf; | |
cbea66d9 | 50 | struct mutex thread_mutex; |
31b58088 MH |
51 | }; |
52 | ||
53 | /* | |
54 | * helper functions | |
55 | */ | |
56 | ||
57 | static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn) | |
58 | { | |
59 | struct appldata_product_id id; | |
60 | int rc; | |
61 | ||
62 | strcpy(id.prod_nr, "LNXAPPL"); | |
63 | id.prod_fn = myhdr->applid; | |
64 | id.record_nr = myhdr->record_num; | |
65 | id.version_nr = myhdr->version; | |
66 | id.release_nr = myhdr->release; | |
67 | id.mod_lvl = myhdr->mod_level; | |
68 | rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen); | |
69 | if (rc <= 0) | |
70 | return rc; | |
1519c0c6 | 71 | pr_err("Writing monitor data failed with rc=%i\n", rc); |
31b58088 MH |
72 | if (rc == 5) |
73 | return -EPERM; | |
31b58088 MH |
74 | return -EINVAL; |
75 | } | |
76 | ||
4d284cac HC |
77 | static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv, |
78 | struct monwrite_hdr *monhdr) | |
31b58088 MH |
79 | { |
80 | struct mon_buf *entry, *next; | |
81 | ||
82 | list_for_each_entry_safe(entry, next, &monpriv->list, list) | |
2c91971f MH |
83 | if ((entry->hdr.mon_function == monhdr->mon_function || |
84 | monhdr->mon_function == MONWRITE_STOP_INTERVAL) && | |
85 | entry->hdr.applid == monhdr->applid && | |
31b58088 MH |
86 | entry->hdr.record_num == monhdr->record_num && |
87 | entry->hdr.version == monhdr->version && | |
88 | entry->hdr.release == monhdr->release && | |
89 | entry->hdr.mod_level == monhdr->mod_level) | |
90 | return entry; | |
2c91971f | 91 | |
31b58088 MH |
92 | return NULL; |
93 | } | |
94 | ||
95 | static int monwrite_new_hdr(struct mon_private *monpriv) | |
96 | { | |
97 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
98 | struct mon_buf *monbuf; | |
99 | int rc; | |
100 | ||
101 | if (monhdr->datalen > MONWRITE_MAX_DATALEN || | |
102 | monhdr->mon_function > MONWRITE_START_CONFIG || | |
103 | monhdr->hdrlen != sizeof(struct monwrite_hdr)) | |
104 | return -EINVAL; | |
2c91971f MH |
105 | monbuf = NULL; |
106 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) | |
107 | monbuf = monwrite_find_hdr(monpriv, monhdr); | |
31b58088 MH |
108 | if (monbuf) { |
109 | if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) { | |
110 | monhdr->datalen = monbuf->hdr.datalen; | |
111 | rc = monwrite_diag(monhdr, monbuf->data, | |
112 | APPLDATA_STOP_REC); | |
113 | list_del(&monbuf->list); | |
2d103d5a | 114 | mon_buf_count--; |
31b58088 MH |
115 | kfree(monbuf->data); |
116 | kfree(monbuf); | |
117 | monbuf = NULL; | |
118 | } | |
2c91971f | 119 | } else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) { |
2d103d5a | 120 | if (mon_buf_count >= mon_max_bufs) |
31b58088 MH |
121 | return -ENOSPC; |
122 | monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL); | |
123 | if (!monbuf) | |
124 | return -ENOMEM; | |
715d854b | 125 | monbuf->data = kzalloc(monhdr->datalen, |
31b58088 MH |
126 | GFP_KERNEL | GFP_DMA); |
127 | if (!monbuf->data) { | |
128 | kfree(monbuf); | |
129 | return -ENOMEM; | |
130 | } | |
131 | monbuf->hdr = *monhdr; | |
132 | list_add_tail(&monbuf->list, &monpriv->list); | |
2c91971f MH |
133 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) |
134 | mon_buf_count++; | |
31b58088 MH |
135 | } |
136 | monpriv->current_buf = monbuf; | |
137 | return 0; | |
138 | } | |
139 | ||
140 | static int monwrite_new_data(struct mon_private *monpriv) | |
141 | { | |
142 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
143 | struct mon_buf *monbuf = monpriv->current_buf; | |
144 | int rc = 0; | |
145 | ||
146 | switch (monhdr->mon_function) { | |
147 | case MONWRITE_START_INTERVAL: | |
148 | if (!monbuf->diag_done) { | |
149 | rc = monwrite_diag(monhdr, monbuf->data, | |
150 | APPLDATA_START_INTERVAL_REC); | |
151 | monbuf->diag_done = 1; | |
152 | } | |
153 | break; | |
154 | case MONWRITE_START_CONFIG: | |
155 | if (!monbuf->diag_done) { | |
156 | rc = monwrite_diag(monhdr, monbuf->data, | |
157 | APPLDATA_START_CONFIG_REC); | |
158 | monbuf->diag_done = 1; | |
159 | } | |
160 | break; | |
161 | case MONWRITE_GEN_EVENT: | |
162 | rc = monwrite_diag(monhdr, monbuf->data, | |
163 | APPLDATA_GEN_EVENT_REC); | |
164 | list_del(&monpriv->current_buf->list); | |
165 | kfree(monpriv->current_buf->data); | |
166 | kfree(monpriv->current_buf); | |
167 | monpriv->current_buf = NULL; | |
168 | break; | |
169 | default: | |
170 | /* monhdr->mon_function is checked in monwrite_new_hdr */ | |
171 | BUG(); | |
172 | } | |
173 | return rc; | |
174 | } | |
175 | ||
176 | /* | |
177 | * file operations | |
178 | */ | |
179 | ||
180 | static int monwrite_open(struct inode *inode, struct file *filp) | |
181 | { | |
182 | struct mon_private *monpriv; | |
183 | ||
184 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); | |
185 | if (!monpriv) | |
186 | return -ENOMEM; | |
187 | INIT_LIST_HEAD(&monpriv->list); | |
188 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
cbea66d9 | 189 | mutex_init(&monpriv->thread_mutex); |
31b58088 | 190 | filp->private_data = monpriv; |
fb78140c | 191 | list_add_tail(&monpriv->priv_list, &mon_priv_list); |
31b58088 MH |
192 | return nonseekable_open(inode, filp); |
193 | } | |
194 | ||
195 | static int monwrite_close(struct inode *inode, struct file *filp) | |
196 | { | |
197 | struct mon_private *monpriv = filp->private_data; | |
198 | struct mon_buf *entry, *next; | |
199 | ||
200 | list_for_each_entry_safe(entry, next, &monpriv->list, list) { | |
201 | if (entry->hdr.mon_function != MONWRITE_GEN_EVENT) | |
202 | monwrite_diag(&entry->hdr, entry->data, | |
203 | APPLDATA_STOP_REC); | |
2d103d5a | 204 | mon_buf_count--; |
31b58088 MH |
205 | list_del(&entry->list); |
206 | kfree(entry->data); | |
207 | kfree(entry); | |
208 | } | |
fb78140c | 209 | list_del(&monpriv->priv_list); |
31b58088 MH |
210 | kfree(monpriv); |
211 | return 0; | |
212 | } | |
213 | ||
214 | static ssize_t monwrite_write(struct file *filp, const char __user *data, | |
215 | size_t count, loff_t *ppos) | |
216 | { | |
217 | struct mon_private *monpriv = filp->private_data; | |
218 | size_t len, written; | |
219 | void *to; | |
220 | int rc; | |
221 | ||
cbea66d9 | 222 | mutex_lock(&monpriv->thread_mutex); |
31b58088 MH |
223 | for (written = 0; written < count; ) { |
224 | if (monpriv->hdr_to_read) { | |
225 | len = min(count - written, monpriv->hdr_to_read); | |
226 | to = (char *) &monpriv->hdr + | |
227 | sizeof(monpriv->hdr) - monpriv->hdr_to_read; | |
228 | if (copy_from_user(to, data + written, len)) { | |
229 | rc = -EFAULT; | |
230 | goto out_error; | |
231 | } | |
232 | monpriv->hdr_to_read -= len; | |
233 | written += len; | |
234 | if (monpriv->hdr_to_read > 0) | |
235 | continue; | |
236 | rc = monwrite_new_hdr(monpriv); | |
237 | if (rc) | |
238 | goto out_error; | |
239 | monpriv->data_to_read = monpriv->current_buf ? | |
240 | monpriv->current_buf->hdr.datalen : 0; | |
241 | } | |
242 | ||
243 | if (monpriv->data_to_read) { | |
244 | len = min(count - written, monpriv->data_to_read); | |
245 | to = monpriv->current_buf->data + | |
246 | monpriv->hdr.datalen - monpriv->data_to_read; | |
247 | if (copy_from_user(to, data + written, len)) { | |
248 | rc = -EFAULT; | |
249 | goto out_error; | |
250 | } | |
251 | monpriv->data_to_read -= len; | |
252 | written += len; | |
253 | if (monpriv->data_to_read > 0) | |
254 | continue; | |
255 | rc = monwrite_new_data(monpriv); | |
256 | if (rc) | |
257 | goto out_error; | |
258 | } | |
259 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
260 | } | |
cbea66d9 | 261 | mutex_unlock(&monpriv->thread_mutex); |
31b58088 MH |
262 | return written; |
263 | ||
264 | out_error: | |
265 | monpriv->data_to_read = 0; | |
266 | monpriv->hdr_to_read = sizeof(struct monwrite_hdr); | |
cbea66d9 | 267 | mutex_unlock(&monpriv->thread_mutex); |
31b58088 MH |
268 | return rc; |
269 | } | |
270 | ||
d54b1fdb | 271 | static const struct file_operations monwrite_fops = { |
31b58088 MH |
272 | .owner = THIS_MODULE, |
273 | .open = &monwrite_open, | |
274 | .release = &monwrite_close, | |
275 | .write = &monwrite_write, | |
276 | }; | |
277 | ||
278 | static struct miscdevice mon_dev = { | |
279 | .name = "monwriter", | |
280 | .fops = &monwrite_fops, | |
281 | .minor = MISC_DYNAMIC_MINOR, | |
282 | }; | |
283 | ||
fb78140c GS |
284 | /* |
285 | * suspend/resume | |
286 | */ | |
287 | ||
288 | static int monwriter_freeze(struct device *dev) | |
289 | { | |
290 | struct mon_private *monpriv; | |
291 | struct mon_buf *monbuf; | |
292 | ||
293 | list_for_each_entry(monpriv, &mon_priv_list, priv_list) { | |
294 | list_for_each_entry(monbuf, &monpriv->list, list) { | |
295 | if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT) | |
296 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
297 | APPLDATA_STOP_REC); | |
298 | } | |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
303 | static int monwriter_restore(struct device *dev) | |
304 | { | |
305 | struct mon_private *monpriv; | |
306 | struct mon_buf *monbuf; | |
307 | ||
308 | list_for_each_entry(monpriv, &mon_priv_list, priv_list) { | |
309 | list_for_each_entry(monbuf, &monpriv->list, list) { | |
310 | if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL) | |
311 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
312 | APPLDATA_START_INTERVAL_REC); | |
313 | if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG) | |
314 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
315 | APPLDATA_START_CONFIG_REC); | |
316 | } | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int monwriter_thaw(struct device *dev) | |
322 | { | |
323 | return monwriter_restore(dev); | |
324 | } | |
325 | ||
47145210 | 326 | static const struct dev_pm_ops monwriter_pm_ops = { |
fb78140c GS |
327 | .freeze = monwriter_freeze, |
328 | .thaw = monwriter_thaw, | |
329 | .restore = monwriter_restore, | |
330 | }; | |
331 | ||
332 | static struct platform_driver monwriter_pdrv = { | |
333 | .driver = { | |
334 | .name = "monwriter", | |
335 | .owner = THIS_MODULE, | |
336 | .pm = &monwriter_pm_ops, | |
337 | }, | |
338 | }; | |
339 | ||
340 | static struct platform_device *monwriter_pdev; | |
341 | ||
31b58088 MH |
342 | /* |
343 | * module init/exit | |
344 | */ | |
345 | ||
346 | static int __init mon_init(void) | |
347 | { | |
fb78140c GS |
348 | int rc; |
349 | ||
350 | if (!MACHINE_IS_VM) | |
31b58088 | 351 | return -ENODEV; |
fb78140c GS |
352 | |
353 | rc = platform_driver_register(&monwriter_pdrv); | |
354 | if (rc) | |
355 | return rc; | |
356 | ||
357 | monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL, | |
358 | 0); | |
359 | if (IS_ERR(monwriter_pdev)) { | |
360 | rc = PTR_ERR(monwriter_pdev); | |
361 | goto out_driver; | |
362 | } | |
363 | ||
801f97b7 GS |
364 | /* |
365 | * misc_register() has to be the last action in module_init(), because | |
366 | * file operations will be available right after this. | |
367 | */ | |
fb78140c GS |
368 | rc = misc_register(&mon_dev); |
369 | if (rc) | |
370 | goto out_device; | |
371 | return 0; | |
372 | ||
373 | out_device: | |
374 | platform_device_unregister(monwriter_pdev); | |
375 | out_driver: | |
376 | platform_driver_unregister(&monwriter_pdrv); | |
377 | return rc; | |
31b58088 MH |
378 | } |
379 | ||
380 | static void __exit mon_exit(void) | |
381 | { | |
382 | WARN_ON(misc_deregister(&mon_dev) != 0); | |
fb78140c GS |
383 | platform_device_unregister(monwriter_pdev); |
384 | platform_driver_unregister(&monwriter_pdrv); | |
31b58088 MH |
385 | } |
386 | ||
387 | module_init(mon_init); | |
388 | module_exit(mon_exit); | |
389 | ||
390 | module_param_named(max_bufs, mon_max_bufs, int, 0644); | |
ceb3dfba | 391 | MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers " |
31b58088 MH |
392 | "that can be active at one time"); |
393 | ||
394 | MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>"); | |
395 | MODULE_DESCRIPTION("Character device driver for writing z/VM " | |
396 | "APPLDATA monitor records."); | |
397 | MODULE_LICENSE("GPL"); |