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6f05e69e | 1 | // SPDX-License-Identifier: GPL-2.0 |
31b58088 | 2 | /* |
31b58088 MH |
3 | * Character device driver for writing z/VM *MONITOR service records. |
4 | * | |
fb78140c | 5 | * Copyright IBM Corp. 2006, 2009 |
31b58088 MH |
6 | * |
7 | * Author(s): Melissa Howland <Melissa.Howland@us.ibm.com> | |
8 | */ | |
9 | ||
1519c0c6 MH |
10 | #define KMSG_COMPONENT "monwriter" |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
31b58088 MH |
13 | #include <linux/module.h> |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/init.h> | |
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/poll.h> | |
cbea66d9 | 22 | #include <linux/mutex.h> |
fb78140c | 23 | #include <linux/platform_device.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
7c0f6ba6 | 25 | #include <linux/uaccess.h> |
31b58088 MH |
26 | #include <asm/ebcdic.h> |
27 | #include <asm/io.h> | |
28 | #include <asm/appldata.h> | |
29 | #include <asm/monwriter.h> | |
30 | ||
524a237e | 31 | #define MONWRITE_MAX_DATALEN 4010 |
31b58088 MH |
32 | |
33 | static int mon_max_bufs = 255; | |
2d103d5a | 34 | static int mon_buf_count; |
31b58088 MH |
35 | |
36 | struct mon_buf { | |
37 | struct list_head list; | |
38 | struct monwrite_hdr hdr; | |
39 | int diag_done; | |
40 | char *data; | |
41 | }; | |
42 | ||
fb78140c GS |
43 | static LIST_HEAD(mon_priv_list); |
44 | ||
31b58088 | 45 | struct mon_private { |
fb78140c | 46 | struct list_head priv_list; |
31b58088 MH |
47 | struct list_head list; |
48 | struct monwrite_hdr hdr; | |
49 | size_t hdr_to_read; | |
50 | size_t data_to_read; | |
51 | struct mon_buf *current_buf; | |
cbea66d9 | 52 | struct mutex thread_mutex; |
31b58088 MH |
53 | }; |
54 | ||
55 | /* | |
56 | * helper functions | |
57 | */ | |
58 | ||
59 | static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn) | |
60 | { | |
61 | struct appldata_product_id id; | |
62 | int rc; | |
63 | ||
3cf11d77 | 64 | strncpy(id.prod_nr, "LNXAPPL", 7); |
31b58088 MH |
65 | id.prod_fn = myhdr->applid; |
66 | id.record_nr = myhdr->record_num; | |
67 | id.version_nr = myhdr->version; | |
68 | id.release_nr = myhdr->release; | |
69 | id.mod_lvl = myhdr->mod_level; | |
70 | rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen); | |
71 | if (rc <= 0) | |
72 | return rc; | |
1519c0c6 | 73 | pr_err("Writing monitor data failed with rc=%i\n", rc); |
31b58088 MH |
74 | if (rc == 5) |
75 | return -EPERM; | |
31b58088 MH |
76 | return -EINVAL; |
77 | } | |
78 | ||
4d284cac HC |
79 | static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv, |
80 | struct monwrite_hdr *monhdr) | |
31b58088 MH |
81 | { |
82 | struct mon_buf *entry, *next; | |
83 | ||
84 | list_for_each_entry_safe(entry, next, &monpriv->list, list) | |
2c91971f MH |
85 | if ((entry->hdr.mon_function == monhdr->mon_function || |
86 | monhdr->mon_function == MONWRITE_STOP_INTERVAL) && | |
87 | entry->hdr.applid == monhdr->applid && | |
31b58088 MH |
88 | entry->hdr.record_num == monhdr->record_num && |
89 | entry->hdr.version == monhdr->version && | |
90 | entry->hdr.release == monhdr->release && | |
91 | entry->hdr.mod_level == monhdr->mod_level) | |
92 | return entry; | |
2c91971f | 93 | |
31b58088 MH |
94 | return NULL; |
95 | } | |
96 | ||
97 | static int monwrite_new_hdr(struct mon_private *monpriv) | |
98 | { | |
99 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
100 | struct mon_buf *monbuf; | |
37fa9975 | 101 | int rc = 0; |
31b58088 MH |
102 | |
103 | if (monhdr->datalen > MONWRITE_MAX_DATALEN || | |
104 | monhdr->mon_function > MONWRITE_START_CONFIG || | |
105 | monhdr->hdrlen != sizeof(struct monwrite_hdr)) | |
106 | return -EINVAL; | |
2c91971f MH |
107 | monbuf = NULL; |
108 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) | |
109 | monbuf = monwrite_find_hdr(monpriv, monhdr); | |
31b58088 MH |
110 | if (monbuf) { |
111 | if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) { | |
112 | monhdr->datalen = monbuf->hdr.datalen; | |
113 | rc = monwrite_diag(monhdr, monbuf->data, | |
114 | APPLDATA_STOP_REC); | |
115 | list_del(&monbuf->list); | |
2d103d5a | 116 | mon_buf_count--; |
31b58088 MH |
117 | kfree(monbuf->data); |
118 | kfree(monbuf); | |
119 | monbuf = NULL; | |
120 | } | |
2c91971f | 121 | } else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) { |
2d103d5a | 122 | if (mon_buf_count >= mon_max_bufs) |
31b58088 MH |
123 | return -ENOSPC; |
124 | monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL); | |
125 | if (!monbuf) | |
126 | return -ENOMEM; | |
715d854b | 127 | monbuf->data = kzalloc(monhdr->datalen, |
31b58088 MH |
128 | GFP_KERNEL | GFP_DMA); |
129 | if (!monbuf->data) { | |
130 | kfree(monbuf); | |
131 | return -ENOMEM; | |
132 | } | |
133 | monbuf->hdr = *monhdr; | |
134 | list_add_tail(&monbuf->list, &monpriv->list); | |
2c91971f MH |
135 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) |
136 | mon_buf_count++; | |
31b58088 MH |
137 | } |
138 | monpriv->current_buf = monbuf; | |
37fa9975 | 139 | return rc; |
31b58088 MH |
140 | } |
141 | ||
142 | static int monwrite_new_data(struct mon_private *monpriv) | |
143 | { | |
144 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
145 | struct mon_buf *monbuf = monpriv->current_buf; | |
146 | int rc = 0; | |
147 | ||
148 | switch (monhdr->mon_function) { | |
149 | case MONWRITE_START_INTERVAL: | |
150 | if (!monbuf->diag_done) { | |
151 | rc = monwrite_diag(monhdr, monbuf->data, | |
152 | APPLDATA_START_INTERVAL_REC); | |
153 | monbuf->diag_done = 1; | |
154 | } | |
155 | break; | |
156 | case MONWRITE_START_CONFIG: | |
157 | if (!monbuf->diag_done) { | |
158 | rc = monwrite_diag(monhdr, monbuf->data, | |
159 | APPLDATA_START_CONFIG_REC); | |
160 | monbuf->diag_done = 1; | |
161 | } | |
162 | break; | |
163 | case MONWRITE_GEN_EVENT: | |
164 | rc = monwrite_diag(monhdr, monbuf->data, | |
165 | APPLDATA_GEN_EVENT_REC); | |
166 | list_del(&monpriv->current_buf->list); | |
167 | kfree(monpriv->current_buf->data); | |
168 | kfree(monpriv->current_buf); | |
169 | monpriv->current_buf = NULL; | |
170 | break; | |
171 | default: | |
172 | /* monhdr->mon_function is checked in monwrite_new_hdr */ | |
173 | BUG(); | |
174 | } | |
175 | return rc; | |
176 | } | |
177 | ||
178 | /* | |
179 | * file operations | |
180 | */ | |
181 | ||
182 | static int monwrite_open(struct inode *inode, struct file *filp) | |
183 | { | |
184 | struct mon_private *monpriv; | |
185 | ||
186 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); | |
187 | if (!monpriv) | |
188 | return -ENOMEM; | |
189 | INIT_LIST_HEAD(&monpriv->list); | |
190 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
cbea66d9 | 191 | mutex_init(&monpriv->thread_mutex); |
31b58088 | 192 | filp->private_data = monpriv; |
fb78140c | 193 | list_add_tail(&monpriv->priv_list, &mon_priv_list); |
31b58088 MH |
194 | return nonseekable_open(inode, filp); |
195 | } | |
196 | ||
197 | static int monwrite_close(struct inode *inode, struct file *filp) | |
198 | { | |
199 | struct mon_private *monpriv = filp->private_data; | |
200 | struct mon_buf *entry, *next; | |
201 | ||
202 | list_for_each_entry_safe(entry, next, &monpriv->list, list) { | |
203 | if (entry->hdr.mon_function != MONWRITE_GEN_EVENT) | |
204 | monwrite_diag(&entry->hdr, entry->data, | |
205 | APPLDATA_STOP_REC); | |
2d103d5a | 206 | mon_buf_count--; |
31b58088 MH |
207 | list_del(&entry->list); |
208 | kfree(entry->data); | |
209 | kfree(entry); | |
210 | } | |
fb78140c | 211 | list_del(&monpriv->priv_list); |
31b58088 MH |
212 | kfree(monpriv); |
213 | return 0; | |
214 | } | |
215 | ||
216 | static ssize_t monwrite_write(struct file *filp, const char __user *data, | |
217 | size_t count, loff_t *ppos) | |
218 | { | |
219 | struct mon_private *monpriv = filp->private_data; | |
220 | size_t len, written; | |
221 | void *to; | |
222 | int rc; | |
223 | ||
cbea66d9 | 224 | mutex_lock(&monpriv->thread_mutex); |
31b58088 MH |
225 | for (written = 0; written < count; ) { |
226 | if (monpriv->hdr_to_read) { | |
227 | len = min(count - written, monpriv->hdr_to_read); | |
228 | to = (char *) &monpriv->hdr + | |
229 | sizeof(monpriv->hdr) - monpriv->hdr_to_read; | |
230 | if (copy_from_user(to, data + written, len)) { | |
231 | rc = -EFAULT; | |
232 | goto out_error; | |
233 | } | |
234 | monpriv->hdr_to_read -= len; | |
235 | written += len; | |
236 | if (monpriv->hdr_to_read > 0) | |
237 | continue; | |
238 | rc = monwrite_new_hdr(monpriv); | |
239 | if (rc) | |
240 | goto out_error; | |
241 | monpriv->data_to_read = monpriv->current_buf ? | |
242 | monpriv->current_buf->hdr.datalen : 0; | |
243 | } | |
244 | ||
245 | if (monpriv->data_to_read) { | |
246 | len = min(count - written, monpriv->data_to_read); | |
247 | to = monpriv->current_buf->data + | |
248 | monpriv->hdr.datalen - monpriv->data_to_read; | |
249 | if (copy_from_user(to, data + written, len)) { | |
250 | rc = -EFAULT; | |
251 | goto out_error; | |
252 | } | |
253 | monpriv->data_to_read -= len; | |
254 | written += len; | |
255 | if (monpriv->data_to_read > 0) | |
256 | continue; | |
257 | rc = monwrite_new_data(monpriv); | |
258 | if (rc) | |
259 | goto out_error; | |
260 | } | |
261 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
262 | } | |
cbea66d9 | 263 | mutex_unlock(&monpriv->thread_mutex); |
31b58088 MH |
264 | return written; |
265 | ||
266 | out_error: | |
267 | monpriv->data_to_read = 0; | |
268 | monpriv->hdr_to_read = sizeof(struct monwrite_hdr); | |
cbea66d9 | 269 | mutex_unlock(&monpriv->thread_mutex); |
31b58088 MH |
270 | return rc; |
271 | } | |
272 | ||
d54b1fdb | 273 | static const struct file_operations monwrite_fops = { |
31b58088 MH |
274 | .owner = THIS_MODULE, |
275 | .open = &monwrite_open, | |
276 | .release = &monwrite_close, | |
277 | .write = &monwrite_write, | |
6038f373 | 278 | .llseek = noop_llseek, |
31b58088 MH |
279 | }; |
280 | ||
281 | static struct miscdevice mon_dev = { | |
282 | .name = "monwriter", | |
283 | .fops = &monwrite_fops, | |
284 | .minor = MISC_DYNAMIC_MINOR, | |
285 | }; | |
286 | ||
fb78140c GS |
287 | /* |
288 | * suspend/resume | |
289 | */ | |
290 | ||
291 | static int monwriter_freeze(struct device *dev) | |
292 | { | |
293 | struct mon_private *monpriv; | |
294 | struct mon_buf *monbuf; | |
295 | ||
296 | list_for_each_entry(monpriv, &mon_priv_list, priv_list) { | |
297 | list_for_each_entry(monbuf, &monpriv->list, list) { | |
298 | if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT) | |
299 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
300 | APPLDATA_STOP_REC); | |
301 | } | |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static int monwriter_restore(struct device *dev) | |
307 | { | |
308 | struct mon_private *monpriv; | |
309 | struct mon_buf *monbuf; | |
310 | ||
311 | list_for_each_entry(monpriv, &mon_priv_list, priv_list) { | |
312 | list_for_each_entry(monbuf, &monpriv->list, list) { | |
313 | if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL) | |
314 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
315 | APPLDATA_START_INTERVAL_REC); | |
316 | if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG) | |
317 | monwrite_diag(&monbuf->hdr, monbuf->data, | |
318 | APPLDATA_START_CONFIG_REC); | |
319 | } | |
320 | } | |
321 | return 0; | |
322 | } | |
323 | ||
324 | static int monwriter_thaw(struct device *dev) | |
325 | { | |
326 | return monwriter_restore(dev); | |
327 | } | |
328 | ||
47145210 | 329 | static const struct dev_pm_ops monwriter_pm_ops = { |
fb78140c GS |
330 | .freeze = monwriter_freeze, |
331 | .thaw = monwriter_thaw, | |
332 | .restore = monwriter_restore, | |
333 | }; | |
334 | ||
335 | static struct platform_driver monwriter_pdrv = { | |
336 | .driver = { | |
337 | .name = "monwriter", | |
fb78140c GS |
338 | .pm = &monwriter_pm_ops, |
339 | }, | |
340 | }; | |
341 | ||
342 | static struct platform_device *monwriter_pdev; | |
343 | ||
31b58088 MH |
344 | /* |
345 | * module init/exit | |
346 | */ | |
347 | ||
348 | static int __init mon_init(void) | |
349 | { | |
fb78140c GS |
350 | int rc; |
351 | ||
352 | if (!MACHINE_IS_VM) | |
31b58088 | 353 | return -ENODEV; |
fb78140c GS |
354 | |
355 | rc = platform_driver_register(&monwriter_pdrv); | |
356 | if (rc) | |
357 | return rc; | |
358 | ||
359 | monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL, | |
360 | 0); | |
361 | if (IS_ERR(monwriter_pdev)) { | |
362 | rc = PTR_ERR(monwriter_pdev); | |
363 | goto out_driver; | |
364 | } | |
365 | ||
801f97b7 GS |
366 | /* |
367 | * misc_register() has to be the last action in module_init(), because | |
368 | * file operations will be available right after this. | |
369 | */ | |
fb78140c GS |
370 | rc = misc_register(&mon_dev); |
371 | if (rc) | |
372 | goto out_device; | |
373 | return 0; | |
374 | ||
375 | out_device: | |
376 | platform_device_unregister(monwriter_pdev); | |
377 | out_driver: | |
378 | platform_driver_unregister(&monwriter_pdrv); | |
379 | return rc; | |
31b58088 MH |
380 | } |
381 | ||
382 | static void __exit mon_exit(void) | |
383 | { | |
547415d5 | 384 | misc_deregister(&mon_dev); |
fb78140c GS |
385 | platform_device_unregister(monwriter_pdev); |
386 | platform_driver_unregister(&monwriter_pdrv); | |
31b58088 MH |
387 | } |
388 | ||
389 | module_init(mon_init); | |
390 | module_exit(mon_exit); | |
391 | ||
392 | module_param_named(max_bufs, mon_max_bufs, int, 0644); | |
ceb3dfba | 393 | MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers " |
31b58088 MH |
394 | "that can be active at one time"); |
395 | ||
396 | MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>"); | |
397 | MODULE_DESCRIPTION("Character device driver for writing z/VM " | |
398 | "APPLDATA monitor records."); | |
399 | MODULE_LICENSE("GPL"); |