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9#define KMSG_COMPONENT "monwriter"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
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>
21#include <linux/mutex.h>
22#include <linux/platform_device.h>
23#include <linux/slab.h>
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
30#define MONWRITE_MAX_DATALEN 4010
31
32static int mon_max_bufs = 255;
33static int mon_buf_count;
34
35struct mon_buf {
36 struct list_head list;
37 struct monwrite_hdr hdr;
38 int diag_done;
39 char *data;
40};
41
42static LIST_HEAD(mon_priv_list);
43
44struct mon_private {
45 struct list_head priv_list;
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;
51 struct mutex thread_mutex;
52};
53
54
55
56
57
58static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn)
59{
60 struct appldata_product_id id;
61 int rc;
62
63 strncpy(id.prod_nr, "LNXAPPL", 7);
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;
72 pr_err("Writing monitor data failed with rc=%i\n", rc);
73 if (rc == 5)
74 return -EPERM;
75 return -EINVAL;
76}
77
78static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv,
79 struct monwrite_hdr *monhdr)
80{
81 struct mon_buf *entry, *next;
82
83 list_for_each_entry_safe(entry, next, &monpriv->list, list)
84 if ((entry->hdr.mon_function == monhdr->mon_function ||
85 monhdr->mon_function == MONWRITE_STOP_INTERVAL) &&
86 entry->hdr.applid == monhdr->applid &&
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;
92
93 return NULL;
94}
95
96static int monwrite_new_hdr(struct mon_private *monpriv)
97{
98 struct monwrite_hdr *monhdr = &monpriv->hdr;
99 struct mon_buf *monbuf;
100 int rc = 0;
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;
106 monbuf = NULL;
107 if (monhdr->mon_function != MONWRITE_GEN_EVENT)
108 monbuf = monwrite_find_hdr(monpriv, monhdr);
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);
115 mon_buf_count--;
116 kfree(monbuf->data);
117 kfree(monbuf);
118 monbuf = NULL;
119 }
120 } else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) {
121 if (mon_buf_count >= mon_max_bufs)
122 return -ENOSPC;
123 monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL);
124 if (!monbuf)
125 return -ENOMEM;
126 monbuf->data = kzalloc(monhdr->datalen,
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);
134 if (monhdr->mon_function != MONWRITE_GEN_EVENT)
135 mon_buf_count++;
136 }
137 monpriv->current_buf = monbuf;
138 return rc;
139}
140
141static 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
172 BUG();
173 }
174 return rc;
175}
176
177
178
179
180
181static 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);
190 mutex_init(&monpriv->thread_mutex);
191 filp->private_data = monpriv;
192 list_add_tail(&monpriv->priv_list, &mon_priv_list);
193 return nonseekable_open(inode, filp);
194}
195
196static 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);
205 mon_buf_count--;
206 list_del(&entry->list);
207 kfree(entry->data);
208 kfree(entry);
209 }
210 list_del(&monpriv->priv_list);
211 kfree(monpriv);
212 return 0;
213}
214
215static 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
223 mutex_lock(&monpriv->thread_mutex);
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 }
262 mutex_unlock(&monpriv->thread_mutex);
263 return written;
264
265out_error:
266 monpriv->data_to_read = 0;
267 monpriv->hdr_to_read = sizeof(struct monwrite_hdr);
268 mutex_unlock(&monpriv->thread_mutex);
269 return rc;
270}
271
272static const struct file_operations monwrite_fops = {
273 .owner = THIS_MODULE,
274 .open = &monwrite_open,
275 .release = &monwrite_close,
276 .write = &monwrite_write,
277 .llseek = noop_llseek,
278};
279
280static struct miscdevice mon_dev = {
281 .name = "monwriter",
282 .fops = &monwrite_fops,
283 .minor = MISC_DYNAMIC_MINOR,
284};
285
286
287
288
289
290static 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
305static 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
323static int monwriter_thaw(struct device *dev)
324{
325 return monwriter_restore(dev);
326}
327
328static const struct dev_pm_ops monwriter_pm_ops = {
329 .freeze = monwriter_freeze,
330 .thaw = monwriter_thaw,
331 .restore = monwriter_restore,
332};
333
334static struct platform_driver monwriter_pdrv = {
335 .driver = {
336 .name = "monwriter",
337 .pm = &monwriter_pm_ops,
338 },
339};
340
341static struct platform_device *monwriter_pdev;
342
343
344
345
346
347static int __init mon_init(void)
348{
349 int rc;
350
351 if (!MACHINE_IS_VM)
352 return -ENODEV;
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
365
366
367
368
369 rc = misc_register(&mon_dev);
370 if (rc)
371 goto out_device;
372 return 0;
373
374out_device:
375 platform_device_unregister(monwriter_pdev);
376out_driver:
377 platform_driver_unregister(&monwriter_pdrv);
378 return rc;
379}
380
381static void __exit mon_exit(void)
382{
383 misc_deregister(&mon_dev);
384 platform_device_unregister(monwriter_pdev);
385 platform_driver_unregister(&monwriter_pdrv);
386}
387
388module_init(mon_init);
389module_exit(mon_exit);
390
391module_param_named(max_bufs, mon_max_bufs, int, 0644);
392MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers "
393 "that can be active at one time");
394
395MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>");
396MODULE_DESCRIPTION("Character device driver for writing z/VM "
397 "APPLDATA monitor records.");
398MODULE_LICENSE("GPL");
399
