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> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
31b58088 MH |
24 | #include <asm/uaccess.h> |
25 | #include <asm/ebcdic.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/appldata.h> | |
28 | #include <asm/monwriter.h> | |
29 | ||
524a237e | 30 | #define MONWRITE_MAX_DATALEN 4010 |
31b58088 MH |
31 | |
32 | static int mon_max_bufs = 255; | |
2d103d5a | 33 | static int mon_buf_count; |
31b58088 MH |
34 | |
35 | struct mon_buf { | |
36 | struct list_head list; | |
37 | struct monwrite_hdr hdr; | |
38 | int diag_done; | |
39 | char *data; | |
40 | }; | |
41 | ||
fb78140c GS |
42 | static LIST_HEAD(mon_priv_list); |
43 | ||
31b58088 | 44 | struct mon_private { |
fb78140c | 45 | struct list_head priv_list; |
31b58088 MH |
46 | struct list_head list; |
47 | struct monwrite_hdr hdr; | |
48 | size_t hdr_to_read; | |
49 | size_t data_to_read; | |
50 | struct mon_buf *current_buf; | |
cbea66d9 | 51 | struct mutex thread_mutex; |
31b58088 MH |
52 | }; |
53 | ||
54 | /* | |
55 | * helper functions | |
56 | */ | |
57 | ||
58 | static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn) | |
59 | { | |
60 | struct appldata_product_id id; | |
61 | int rc; | |
62 | ||
3cf11d77 | 63 | strncpy(id.prod_nr, "LNXAPPL", 7); |
31b58088 MH |
64 | id.prod_fn = myhdr->applid; |
65 | id.record_nr = myhdr->record_num; | |
66 | id.version_nr = myhdr->version; | |
67 | id.release_nr = myhdr->release; | |
68 | id.mod_lvl = myhdr->mod_level; | |
69 | rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen); | |
70 | if (rc <= 0) | |
71 | return rc; | |
1519c0c6 | 72 | pr_err("Writing monitor data failed with rc=%i\n", rc); |
31b58088 MH |
73 | if (rc == 5) |
74 | return -EPERM; | |
31b58088 MH |
75 | return -EINVAL; |
76 | } | |
77 | ||
4d284cac HC |
78 | static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv, |
79 | struct monwrite_hdr *monhdr) | |
31b58088 MH |
80 | { |
81 | struct mon_buf *entry, *next; | |
82 | ||
83 | list_for_each_entry_safe(entry, next, &monpriv->list, list) | |
2c91971f MH |
84 | if ((entry->hdr.mon_function == monhdr->mon_function || |
85 | monhdr->mon_function == MONWRITE_STOP_INTERVAL) && | |
86 | entry->hdr.applid == monhdr->applid && | |
31b58088 MH |
87 | entry->hdr.record_num == monhdr->record_num && |
88 | entry->hdr.version == monhdr->version && | |
89 | entry->hdr.release == monhdr->release && | |
90 | entry->hdr.mod_level == monhdr->mod_level) | |
91 | return entry; | |
2c91971f | 92 | |
31b58088 MH |
93 | return NULL; |
94 | } | |
95 | ||
96 | static int monwrite_new_hdr(struct mon_private *monpriv) | |
97 | { | |
98 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
99 | struct mon_buf *monbuf; | |
37fa9975 | 100 | int rc = 0; |
31b58088 MH |
101 | |
102 | if (monhdr->datalen > MONWRITE_MAX_DATALEN || | |
103 | monhdr->mon_function > MONWRITE_START_CONFIG || | |
104 | monhdr->hdrlen != sizeof(struct monwrite_hdr)) | |
105 | return -EINVAL; | |
2c91971f MH |
106 | monbuf = NULL; |
107 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) | |
108 | monbuf = monwrite_find_hdr(monpriv, monhdr); | |
31b58088 MH |
109 | if (monbuf) { |
110 | if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) { | |
111 | monhdr->datalen = monbuf->hdr.datalen; | |
112 | rc = monwrite_diag(monhdr, monbuf->data, | |
113 | APPLDATA_STOP_REC); | |
114 | list_del(&monbuf->list); | |
2d103d5a | 115 | mon_buf_count--; |
31b58088 MH |
116 | kfree(monbuf->data); |
117 | kfree(monbuf); | |
118 | monbuf = NULL; | |
119 | } | |
2c91971f | 120 | } else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) { |
2d103d5a | 121 | if (mon_buf_count >= mon_max_bufs) |
31b58088 MH |
122 | return -ENOSPC; |
123 | monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL); | |
124 | if (!monbuf) | |
125 | return -ENOMEM; | |
715d854b | 126 | monbuf->data = kzalloc(monhdr->datalen, |
31b58088 MH |
127 | GFP_KERNEL | GFP_DMA); |
128 | if (!monbuf->data) { | |
129 | kfree(monbuf); | |
130 | return -ENOMEM; | |
131 | } | |
132 | monbuf->hdr = *monhdr; | |
133 | list_add_tail(&monbuf->list, &monpriv->list); | |
2c91971f MH |
134 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) |
135 | mon_buf_count++; | |
31b58088 MH |
136 | } |
137 | monpriv->current_buf = monbuf; | |
37fa9975 | 138 | return rc; |
31b58088 MH |
139 | } |
140 | ||
141 | static int monwrite_new_data(struct mon_private *monpriv) | |
142 | { | |
143 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
144 | struct mon_buf *monbuf = monpriv->current_buf; | |
145 | int rc = 0; | |
146 | ||
147 | switch (monhdr->mon_function) { | |
148 | case MONWRITE_START_INTERVAL: | |
149 | if (!monbuf->diag_done) { | |
150 | rc = monwrite_diag(monhdr, monbuf->data, | |
151 | APPLDATA_START_INTERVAL_REC); | |
152 | monbuf->diag_done = 1; | |
153 | } | |
154 | break; | |
155 | case MONWRITE_START_CONFIG: | |
156 | if (!monbuf->diag_done) { | |
157 | rc = monwrite_diag(monhdr, monbuf->data, | |
158 | APPLDATA_START_CONFIG_REC); | |
159 | monbuf->diag_done = 1; | |
160 | } | |
161 | break; | |
162 | case MONWRITE_GEN_EVENT: | |
163 | rc = monwrite_diag(monhdr, monbuf->data, | |
164 | APPLDATA_GEN_EVENT_REC); | |
165 | list_del(&monpriv->current_buf->list); | |
166 | kfree(monpriv->current_buf->data); | |
167 | kfree(monpriv->current_buf); | |
168 | monpriv->current_buf = NULL; | |
169 | break; | |
170 | default: | |
171 | /* monhdr->mon_function is checked in monwrite_new_hdr */ | |
172 | BUG(); | |
173 | } | |
174 | return rc; | |
175 | } | |
176 | ||
177 | /* | |
178 | * file operations | |
179 | */ | |
180 | ||
181 | static int monwrite_open(struct inode *inode, struct file *filp) | |
182 | { | |
183 | struct mon_private *monpriv; | |
184 | ||
185 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); | |
186 | if (!monpriv) | |
187 | return -ENOMEM; | |
188 | INIT_LIST_HEAD(&monpriv->list); | |
189 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
cbea66d9 | 190 | mutex_init(&monpriv->thread_mutex); |
31b58088 | 191 | filp->private_data = monpriv; |
fb78140c | 192 | list_add_tail(&monpriv->priv_list, &mon_priv_list); |
31b58088 MH |
193 | return nonseekable_open(inode, filp); |
194 | } | |
195 | ||
196 | static int monwrite_close(struct inode *inode, struct file *filp) | |
197 | { | |
198 | struct mon_private *monpriv = filp->private_data; | |
199 | struct mon_buf *entry, *next; | |
200 | ||
201 | list_for_each_entry_safe(entry, next, &monpriv->list, list) { | |
202 | if (entry->hdr.mon_function != MONWRITE_GEN_EVENT) | |
203 | monwrite_diag(&entry->hdr, entry->data, | |
204 | APPLDATA_STOP_REC); | |
2d103d5a | 205 | mon_buf_count--; |
31b58088 MH |
206 | list_del(&entry->list); |
207 | kfree(entry->data); | |
208 | kfree(entry); | |
209 | } | |
fb78140c | 210 | list_del(&monpriv->priv_list); |
31b58088 MH |
211 | kfree(monpriv); |
212 | return 0; | |
213 | } | |
214 | ||
215 | static ssize_t monwrite_write(struct file *filp, const char __user *data, | |
216 | size_t count, loff_t *ppos) | |
217 | { | |
218 | struct mon_private *monpriv = filp->private_data; | |
219 | size_t len, written; | |
220 | void *to; | |
221 | int rc; | |
222 | ||
cbea66d9 | 223 | mutex_lock(&monpriv->thread_mutex); |
31b58088 MH |
224 | for (written = 0; written < count; ) { |
225 | if (monpriv->hdr_to_read) { | |
226 | len = min(count - written, monpriv->hdr_to_read); | |
227 | to = (char *) &monpriv->hdr + | |
228 | sizeof(monpriv->hdr) - monpriv->hdr_to_read; | |
229 | if (copy_from_user(to, data + written, len)) { | |
230 | rc = -EFAULT; | |
231 | goto out_error; | |
232 | } | |
233 | monpriv->hdr_to_read -= len; | |
234 | written += len; | |
235 | if (monpriv->hdr_to_read > 0) | |
236 | continue; | |
237 | rc = monwrite_new_hdr(monpriv); | |
238 | if (rc) | |
239 | goto out_error; | |
240 | monpriv->data_to_read = monpriv->current_buf ? | |
241 | monpriv->current_buf->hdr.datalen : 0; | |
242 | } | |
243 | ||
244 | if (monpriv->data_to_read) { | |
245 | len = min(count - written, monpriv->data_to_read); | |
246 | to = monpriv->current_buf->data + | |
247 | monpriv->hdr.datalen - monpriv->data_to_read; | |
248 | if (copy_from_user(to, data + written, len)) { | |
249 | rc = -EFAULT; | |
250 | goto out_error; | |
251 | } | |
252 | monpriv->data_to_read -= len; | |
253 | written += len; | |
254 | if (monpriv->data_to_read > 0) | |
255 | continue; | |
256 | rc = monwrite_new_data(monpriv); | |
257 | if (rc) | |
258 | goto out_error; | |
259 | } | |
260 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
261 | } | |
cbea66d9 | 262 | mutex_unlock(&monpriv->thread_mutex); |
31b58088 MH |
263 | return written; |
264 | ||
265 | out_error: | |
266 | monpriv->data_to_read = 0; | |
267 | monpriv->hdr_to_read = sizeof(struct monwrite_hdr); | |
cbea66d9 | 268 | mutex_unlock(&monpriv->thread_mutex); |
31b58088 MH |
269 | return rc; |
270 | } | |
271 | ||
d54b1fdb | 272 | static const struct file_operations monwrite_fops = { |
31b58088 MH |
273 | .owner = THIS_MODULE, |
274 | .open = &monwrite_open, | |
275 | .release = &monwrite_close, | |
276 | .write = &monwrite_write, | |
6038f373 | 277 | .llseek = noop_llseek, |
31b58088 MH |
278 | }; |
279 | ||
280 | static struct miscdevice mon_dev = { | |
281 | .name = "monwriter", | |
282 | .fops = &monwrite_fops, | |
283 | .minor = MISC_DYNAMIC_MINOR, | |
284 | }; | |
285 | ||
fb78140c GS |
286 | /* |
287 | * suspend/resume | |
288 | */ | |
289 | ||
290 | static int monwriter_freeze(struct device *dev) | |
291 | { | |
292 | struct mon_private *monpriv; | |
293 | struct mon_buf *monbuf; | |
294 | ||
295 | list_for_each_entry(monpriv, &mon_priv_list, priv_list) { | |
296 | list_for_each_entry(monbuf, &monpriv->list, list) { | |
297 | if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT) | |
298 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
299 | APPLDATA_STOP_REC); | |
300 | } | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int monwriter_restore(struct device *dev) | |
306 | { | |
307 | struct mon_private *monpriv; | |
308 | struct mon_buf *monbuf; | |
309 | ||
310 | list_for_each_entry(monpriv, &mon_priv_list, priv_list) { | |
311 | list_for_each_entry(monbuf, &monpriv->list, list) { | |
312 | if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL) | |
313 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
314 | APPLDATA_START_INTERVAL_REC); | |
315 | if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG) | |
316 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
317 | APPLDATA_START_CONFIG_REC); | |
318 | } | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static int monwriter_thaw(struct device *dev) | |
324 | { | |
325 | return monwriter_restore(dev); | |
326 | } | |
327 | ||
47145210 | 328 | static const struct dev_pm_ops monwriter_pm_ops = { |
fb78140c GS |
329 | .freeze = monwriter_freeze, |
330 | .thaw = monwriter_thaw, | |
331 | .restore = monwriter_restore, | |
332 | }; | |
333 | ||
334 | static struct platform_driver monwriter_pdrv = { | |
335 | .driver = { | |
336 | .name = "monwriter", | |
fb78140c GS |
337 | .pm = &monwriter_pm_ops, |
338 | }, | |
339 | }; | |
340 | ||
341 | static struct platform_device *monwriter_pdev; | |
342 | ||
31b58088 MH |
343 | /* |
344 | * module init/exit | |
345 | */ | |
346 | ||
347 | static int __init mon_init(void) | |
348 | { | |
fb78140c GS |
349 | int rc; |
350 | ||
351 | if (!MACHINE_IS_VM) | |
31b58088 | 352 | return -ENODEV; |
fb78140c GS |
353 | |
354 | rc = platform_driver_register(&monwriter_pdrv); | |
355 | if (rc) | |
356 | return rc; | |
357 | ||
358 | monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL, | |
359 | 0); | |
360 | if (IS_ERR(monwriter_pdev)) { | |
361 | rc = PTR_ERR(monwriter_pdev); | |
362 | goto out_driver; | |
363 | } | |
364 | ||
801f97b7 GS |
365 | /* |
366 | * misc_register() has to be the last action in module_init(), because | |
367 | * file operations will be available right after this. | |
368 | */ | |
fb78140c GS |
369 | rc = misc_register(&mon_dev); |
370 | if (rc) | |
371 | goto out_device; | |
372 | return 0; | |
373 | ||
374 | out_device: | |
375 | platform_device_unregister(monwriter_pdev); | |
376 | out_driver: | |
377 | platform_driver_unregister(&monwriter_pdrv); | |
378 | return rc; | |
31b58088 MH |
379 | } |
380 | ||
381 | static void __exit mon_exit(void) | |
382 | { | |
547415d5 | 383 | misc_deregister(&mon_dev); |
fb78140c GS |
384 | platform_device_unregister(monwriter_pdev); |
385 | platform_driver_unregister(&monwriter_pdrv); | |
31b58088 MH |
386 | } |
387 | ||
388 | module_init(mon_init); | |
389 | module_exit(mon_exit); | |
390 | ||
391 | module_param_named(max_bufs, mon_max_bufs, int, 0644); | |
ceb3dfba | 392 | MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers " |
31b58088 MH |
393 | "that can be active at one time"); |
394 | ||
395 | MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>"); | |
396 | MODULE_DESCRIPTION("Character device driver for writing z/VM " | |
397 | "APPLDATA monitor records."); | |
398 | MODULE_LICENSE("GPL"); |