aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/char/monwriter.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/char/monwriter.c')
-rw-r--r--drivers/s390/char/monwriter.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/drivers/s390/char/monwriter.c b/drivers/s390/char/monwriter.c
new file mode 100644
index 000000000000..1e3939aeb8ab
--- /dev/null
+++ b/drivers/s390/char/monwriter.c
@@ -0,0 +1,292 @@
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
26#define MONWRITE_MAX_DATALEN 4024
27
28static int mon_max_bufs = 255;
29
30struct mon_buf {
31 struct list_head list;
32 struct monwrite_hdr hdr;
33 int diag_done;
34 char *data;
35};
36
37struct mon_private {
38 struct list_head list;
39 struct monwrite_hdr hdr;
40 size_t hdr_to_read;
41 size_t data_to_read;
42 struct mon_buf *current_buf;
43 int mon_buf_count;
44};
45
46/*
47 * helper functions
48 */
49
50static 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
70static inline struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv,
71 struct monwrite_hdr *monhdr)
72{
73 struct mon_buf *entry, *next;
74
75 list_for_each_entry_safe(entry, next, &monpriv->list, list)
76 if (entry->hdr.applid == monhdr->applid &&
77 entry->hdr.record_num == monhdr->record_num &&
78 entry->hdr.version == monhdr->version &&
79 entry->hdr.release == monhdr->release &&
80 entry->hdr.mod_level == monhdr->mod_level)
81 return entry;
82 return NULL;
83}
84
85static int monwrite_new_hdr(struct mon_private *monpriv)
86{
87 struct monwrite_hdr *monhdr = &monpriv->hdr;
88 struct mon_buf *monbuf;
89 int rc;
90
91 if (monhdr->datalen > MONWRITE_MAX_DATALEN ||
92 monhdr->mon_function > MONWRITE_START_CONFIG ||
93 monhdr->hdrlen != sizeof(struct monwrite_hdr))
94 return -EINVAL;
95 monbuf = monwrite_find_hdr(monpriv, monhdr);
96 if (monbuf) {
97 if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) {
98 monhdr->datalen = monbuf->hdr.datalen;
99 rc = monwrite_diag(monhdr, monbuf->data,
100 APPLDATA_STOP_REC);
101 list_del(&monbuf->list);
102 monpriv->mon_buf_count--;
103 kfree(monbuf->data);
104 kfree(monbuf);
105 monbuf = NULL;
106 }
107 } else {
108 if (monpriv->mon_buf_count >= mon_max_bufs)
109 return -ENOSPC;
110 monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL);
111 if (!monbuf)
112 return -ENOMEM;
113 monbuf->data = kzalloc(monbuf->hdr.datalen,
114 GFP_KERNEL | GFP_DMA);
115 if (!monbuf->data) {
116 kfree(monbuf);
117 return -ENOMEM;
118 }
119 monbuf->hdr = *monhdr;
120 list_add_tail(&monbuf->list, &monpriv->list);
121 monpriv->mon_buf_count++;
122 }
123 monpriv->current_buf = monbuf;
124 return 0;
125}
126
127static int monwrite_new_data(struct mon_private *monpriv)
128{
129 struct monwrite_hdr *monhdr = &monpriv->hdr;
130 struct mon_buf *monbuf = monpriv->current_buf;
131 int rc = 0;
132
133 switch (monhdr->mon_function) {
134 case MONWRITE_START_INTERVAL:
135 if (!monbuf->diag_done) {
136 rc = monwrite_diag(monhdr, monbuf->data,
137 APPLDATA_START_INTERVAL_REC);
138 monbuf->diag_done = 1;
139 }
140 break;
141 case MONWRITE_START_CONFIG:
142 if (!monbuf->diag_done) {
143 rc = monwrite_diag(monhdr, monbuf->data,
144 APPLDATA_START_CONFIG_REC);
145 monbuf->diag_done = 1;
146 }
147 break;
148 case MONWRITE_GEN_EVENT:
149 rc = monwrite_diag(monhdr, monbuf->data,
150 APPLDATA_GEN_EVENT_REC);
151 list_del(&monpriv->current_buf->list);
152 kfree(monpriv->current_buf->data);
153 kfree(monpriv->current_buf);
154 monpriv->current_buf = NULL;
155 break;
156 default:
157 /* monhdr->mon_function is checked in monwrite_new_hdr */
158 BUG();
159 }
160 return rc;
161}
162
163/*
164 * file operations
165 */
166
167static int monwrite_open(struct inode *inode, struct file *filp)
168{
169 struct mon_private *monpriv;
170
171 monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL);
172 if (!monpriv)
173 return -ENOMEM;
174 INIT_LIST_HEAD(&monpriv->list);
175 monpriv->hdr_to_read = sizeof(monpriv->hdr);
176 filp->private_data = monpriv;
177 return nonseekable_open(inode, filp);
178}
179
180static int monwrite_close(struct inode *inode, struct file *filp)
181{
182 struct mon_private *monpriv = filp->private_data;
183 struct mon_buf *entry, *next;
184
185 list_for_each_entry_safe(entry, next, &monpriv->list, list) {
186 if (entry->hdr.mon_function != MONWRITE_GEN_EVENT)
187 monwrite_diag(&entry->hdr, entry->data,
188 APPLDATA_STOP_REC);
189 monpriv->mon_buf_count--;
190 list_del(&entry->list);
191 kfree(entry->data);
192 kfree(entry);
193 }
194 kfree(monpriv);
195 return 0;
196}
197
198static ssize_t monwrite_write(struct file *filp, const char __user *data,
199 size_t count, loff_t *ppos)
200{
201 struct mon_private *monpriv = filp->private_data;
202 size_t len, written;
203 void *to;
204 int rc;
205
206 for (written = 0; written < count; ) {
207 if (monpriv->hdr_to_read) {
208 len = min(count - written, monpriv->hdr_to_read);
209 to = (char *) &monpriv->hdr +
210 sizeof(monpriv->hdr) - monpriv->hdr_to_read;
211 if (copy_from_user(to, data + written, len)) {
212 rc = -EFAULT;
213 goto out_error;
214 }
215 monpriv->hdr_to_read -= len;
216 written += len;
217 if (monpriv->hdr_to_read > 0)
218 continue;
219 rc = monwrite_new_hdr(monpriv);
220 if (rc)
221 goto out_error;
222 monpriv->data_to_read = monpriv->current_buf ?
223 monpriv->current_buf->hdr.datalen : 0;
224 }
225
226 if (monpriv->data_to_read) {
227 len = min(count - written, monpriv->data_to_read);
228 to = monpriv->current_buf->data +
229 monpriv->hdr.datalen - monpriv->data_to_read;
230 if (copy_from_user(to, data + written, len)) {
231 rc = -EFAULT;
232 goto out_error;
233 }
234 monpriv->data_to_read -= len;
235 written += len;
236 if (monpriv->data_to_read > 0)
237 continue;
238 rc = monwrite_new_data(monpriv);
239 if (rc)
240 goto out_error;
241 }
242 monpriv->hdr_to_read = sizeof(monpriv->hdr);
243 }
244 return written;
245
246out_error:
247 monpriv->data_to_read = 0;
248 monpriv->hdr_to_read = sizeof(struct monwrite_hdr);
249 return rc;
250}
251
252static struct file_operations monwrite_fops = {
253 .owner = THIS_MODULE,
254 .open = &monwrite_open,
255 .release = &monwrite_close,
256 .write = &monwrite_write,
257};
258
259static struct miscdevice mon_dev = {
260 .name = "monwriter",
261 .fops = &monwrite_fops,
262 .minor = MISC_DYNAMIC_MINOR,
263};
264
265/*
266 * module init/exit
267 */
268
269static int __init mon_init(void)
270{
271 if (MACHINE_IS_VM)
272 return misc_register(&mon_dev);
273 else
274 return -ENODEV;
275}
276
277static void __exit mon_exit(void)
278{
279 WARN_ON(misc_deregister(&mon_dev) != 0);
280}
281
282module_init(mon_init);
283module_exit(mon_exit);
284
285module_param_named(max_bufs, mon_max_bufs, int, 0644);
286MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers"
287 "that can be active at one time");
288
289MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>");
290MODULE_DESCRIPTION("Character device driver for writing z/VM "
291 "APPLDATA monitor records.");
292MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 19:18:40 -0500