Commit | Line | Data |
---|---|---|
31b58088 MH |
1 | /* |
2 | * drivers/s390/char/monwriter.c | |
3 | * | |
4 | * Character device driver for writing z/VM *MONITOR service records. | |
5 | * | |
6 | * Copyright (C) IBM Corp. 2006 | |
7 | * | |
8 | * Author(s): Melissa Howland <Melissa.Howland@us.ibm.com> | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/moduleparam.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/miscdevice.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/poll.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/ebcdic.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/appldata.h> | |
24 | #include <asm/monwriter.h> | |
25 | ||
524a237e | 26 | #define MONWRITE_MAX_DATALEN 4010 |
31b58088 MH |
27 | |
28 | static int mon_max_bufs = 255; | |
2d103d5a | 29 | static int mon_buf_count; |
31b58088 MH |
30 | |
31 | struct mon_buf { | |
32 | struct list_head list; | |
33 | struct monwrite_hdr hdr; | |
34 | int diag_done; | |
35 | char *data; | |
36 | }; | |
37 | ||
38 | struct mon_private { | |
39 | struct list_head list; | |
40 | struct monwrite_hdr hdr; | |
41 | size_t hdr_to_read; | |
42 | size_t data_to_read; | |
43 | struct mon_buf *current_buf; | |
31b58088 MH |
44 | }; |
45 | ||
46 | /* | |
47 | * helper functions | |
48 | */ | |
49 | ||
50 | static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn) | |
51 | { | |
52 | struct appldata_product_id id; | |
53 | int rc; | |
54 | ||
55 | strcpy(id.prod_nr, "LNXAPPL"); | |
56 | id.prod_fn = myhdr->applid; | |
57 | id.record_nr = myhdr->record_num; | |
58 | id.version_nr = myhdr->version; | |
59 | id.release_nr = myhdr->release; | |
60 | id.mod_lvl = myhdr->mod_level; | |
61 | rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen); | |
62 | if (rc <= 0) | |
63 | return rc; | |
64 | if (rc == 5) | |
65 | return -EPERM; | |
66 | printk("DIAG X'DC' error with return code: %i\n", rc); | |
67 | return -EINVAL; | |
68 | } | |
69 | ||
4d284cac HC |
70 | static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv, |
71 | struct monwrite_hdr *monhdr) | |
31b58088 MH |
72 | { |
73 | struct mon_buf *entry, *next; | |
74 | ||
75 | list_for_each_entry_safe(entry, next, &monpriv->list, list) | |
2c91971f MH |
76 | if ((entry->hdr.mon_function == monhdr->mon_function || |
77 | monhdr->mon_function == MONWRITE_STOP_INTERVAL) && | |
78 | entry->hdr.applid == monhdr->applid && | |
31b58088 MH |
79 | entry->hdr.record_num == monhdr->record_num && |
80 | entry->hdr.version == monhdr->version && | |
81 | entry->hdr.release == monhdr->release && | |
82 | entry->hdr.mod_level == monhdr->mod_level) | |
83 | return entry; | |
2c91971f | 84 | |
31b58088 MH |
85 | return NULL; |
86 | } | |
87 | ||
88 | static int monwrite_new_hdr(struct mon_private *monpriv) | |
89 | { | |
90 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
91 | struct mon_buf *monbuf; | |
92 | int rc; | |
93 | ||
94 | if (monhdr->datalen > MONWRITE_MAX_DATALEN || | |
95 | monhdr->mon_function > MONWRITE_START_CONFIG || | |
96 | monhdr->hdrlen != sizeof(struct monwrite_hdr)) | |
97 | return -EINVAL; | |
2c91971f MH |
98 | monbuf = NULL; |
99 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) | |
100 | monbuf = monwrite_find_hdr(monpriv, monhdr); | |
31b58088 MH |
101 | if (monbuf) { |
102 | if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) { | |
103 | monhdr->datalen = monbuf->hdr.datalen; | |
104 | rc = monwrite_diag(monhdr, monbuf->data, | |
105 | APPLDATA_STOP_REC); | |
106 | list_del(&monbuf->list); | |
2d103d5a | 107 | mon_buf_count--; |
31b58088 MH |
108 | kfree(monbuf->data); |
109 | kfree(monbuf); | |
110 | monbuf = NULL; | |
111 | } | |
2c91971f | 112 | } else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) { |
2d103d5a | 113 | if (mon_buf_count >= mon_max_bufs) |
31b58088 MH |
114 | return -ENOSPC; |
115 | monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL); | |
116 | if (!monbuf) | |
117 | return -ENOMEM; | |
715d854b | 118 | monbuf->data = kzalloc(monhdr->datalen, |
31b58088 MH |
119 | GFP_KERNEL | GFP_DMA); |
120 | if (!monbuf->data) { | |
121 | kfree(monbuf); | |
122 | return -ENOMEM; | |
123 | } | |
124 | monbuf->hdr = *monhdr; | |
125 | list_add_tail(&monbuf->list, &monpriv->list); | |
2c91971f MH |
126 | if (monhdr->mon_function != MONWRITE_GEN_EVENT) |
127 | mon_buf_count++; | |
31b58088 MH |
128 | } |
129 | monpriv->current_buf = monbuf; | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static int monwrite_new_data(struct mon_private *monpriv) | |
134 | { | |
135 | struct monwrite_hdr *monhdr = &monpriv->hdr; | |
136 | struct mon_buf *monbuf = monpriv->current_buf; | |
137 | int rc = 0; | |
138 | ||
139 | switch (monhdr->mon_function) { | |
140 | case MONWRITE_START_INTERVAL: | |
141 | if (!monbuf->diag_done) { | |
142 | rc = monwrite_diag(monhdr, monbuf->data, | |
143 | APPLDATA_START_INTERVAL_REC); | |
144 | monbuf->diag_done = 1; | |
145 | } | |
146 | break; | |
147 | case MONWRITE_START_CONFIG: | |
148 | if (!monbuf->diag_done) { | |
149 | rc = monwrite_diag(monhdr, monbuf->data, | |
150 | APPLDATA_START_CONFIG_REC); | |
151 | monbuf->diag_done = 1; | |
152 | } | |
153 | break; | |
154 | case MONWRITE_GEN_EVENT: | |
155 | rc = monwrite_diag(monhdr, monbuf->data, | |
156 | APPLDATA_GEN_EVENT_REC); | |
157 | list_del(&monpriv->current_buf->list); | |
158 | kfree(monpriv->current_buf->data); | |
159 | kfree(monpriv->current_buf); | |
160 | monpriv->current_buf = NULL; | |
161 | break; | |
162 | default: | |
163 | /* monhdr->mon_function is checked in monwrite_new_hdr */ | |
164 | BUG(); | |
165 | } | |
166 | return rc; | |
167 | } | |
168 | ||
169 | /* | |
170 | * file operations | |
171 | */ | |
172 | ||
173 | static int monwrite_open(struct inode *inode, struct file *filp) | |
174 | { | |
175 | struct mon_private *monpriv; | |
176 | ||
177 | monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); | |
178 | if (!monpriv) | |
179 | return -ENOMEM; | |
180 | INIT_LIST_HEAD(&monpriv->list); | |
181 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
182 | filp->private_data = monpriv; | |
183 | return nonseekable_open(inode, filp); | |
184 | } | |
185 | ||
186 | static int monwrite_close(struct inode *inode, struct file *filp) | |
187 | { | |
188 | struct mon_private *monpriv = filp->private_data; | |
189 | struct mon_buf *entry, *next; | |
190 | ||
191 | list_for_each_entry_safe(entry, next, &monpriv->list, list) { | |
192 | if (entry->hdr.mon_function != MONWRITE_GEN_EVENT) | |
193 | monwrite_diag(&entry->hdr, entry->data, | |
194 | APPLDATA_STOP_REC); | |
2d103d5a | 195 | mon_buf_count--; |
31b58088 MH |
196 | list_del(&entry->list); |
197 | kfree(entry->data); | |
198 | kfree(entry); | |
199 | } | |
200 | kfree(monpriv); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static ssize_t monwrite_write(struct file *filp, const char __user *data, | |
205 | size_t count, loff_t *ppos) | |
206 | { | |
207 | struct mon_private *monpriv = filp->private_data; | |
208 | size_t len, written; | |
209 | void *to; | |
210 | int rc; | |
211 | ||
212 | for (written = 0; written < count; ) { | |
213 | if (monpriv->hdr_to_read) { | |
214 | len = min(count - written, monpriv->hdr_to_read); | |
215 | to = (char *) &monpriv->hdr + | |
216 | sizeof(monpriv->hdr) - monpriv->hdr_to_read; | |
217 | if (copy_from_user(to, data + written, len)) { | |
218 | rc = -EFAULT; | |
219 | goto out_error; | |
220 | } | |
221 | monpriv->hdr_to_read -= len; | |
222 | written += len; | |
223 | if (monpriv->hdr_to_read > 0) | |
224 | continue; | |
225 | rc = monwrite_new_hdr(monpriv); | |
226 | if (rc) | |
227 | goto out_error; | |
228 | monpriv->data_to_read = monpriv->current_buf ? | |
229 | monpriv->current_buf->hdr.datalen : 0; | |
230 | } | |
231 | ||
232 | if (monpriv->data_to_read) { | |
233 | len = min(count - written, monpriv->data_to_read); | |
234 | to = monpriv->current_buf->data + | |
235 | monpriv->hdr.datalen - monpriv->data_to_read; | |
236 | if (copy_from_user(to, data + written, len)) { | |
237 | rc = -EFAULT; | |
238 | goto out_error; | |
239 | } | |
240 | monpriv->data_to_read -= len; | |
241 | written += len; | |
242 | if (monpriv->data_to_read > 0) | |
243 | continue; | |
244 | rc = monwrite_new_data(monpriv); | |
245 | if (rc) | |
246 | goto out_error; | |
247 | } | |
248 | monpriv->hdr_to_read = sizeof(monpriv->hdr); | |
249 | } | |
250 | return written; | |
251 | ||
252 | out_error: | |
253 | monpriv->data_to_read = 0; | |
254 | monpriv->hdr_to_read = sizeof(struct monwrite_hdr); | |
255 | return rc; | |
256 | } | |
257 | ||
d54b1fdb | 258 | static const struct file_operations monwrite_fops = { |
31b58088 MH |
259 | .owner = THIS_MODULE, |
260 | .open = &monwrite_open, | |
261 | .release = &monwrite_close, | |
262 | .write = &monwrite_write, | |
263 | }; | |
264 | ||
265 | static struct miscdevice mon_dev = { | |
266 | .name = "monwriter", | |
267 | .fops = &monwrite_fops, | |
268 | .minor = MISC_DYNAMIC_MINOR, | |
269 | }; | |
270 | ||
271 | /* | |
272 | * module init/exit | |
273 | */ | |
274 | ||
275 | static int __init mon_init(void) | |
276 | { | |
277 | if (MACHINE_IS_VM) | |
278 | return misc_register(&mon_dev); | |
279 | else | |
280 | return -ENODEV; | |
281 | } | |
282 | ||
283 | static void __exit mon_exit(void) | |
284 | { | |
285 | WARN_ON(misc_deregister(&mon_dev) != 0); | |
286 | } | |
287 | ||
288 | module_init(mon_init); | |
289 | module_exit(mon_exit); | |
290 | ||
291 | module_param_named(max_bufs, mon_max_bufs, int, 0644); | |
292 | MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers" | |
293 | "that can be active at one time"); | |
294 | ||
295 | MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>"); | |
296 | MODULE_DESCRIPTION("Character device driver for writing z/VM " | |
297 | "APPLDATA monitor records."); | |
298 | MODULE_LICENSE("GPL"); |