Commit | Line | Data |
---|---|---|
c114728a HJP |
1 | /* |
2 | * Enable Asynchronous Notification via SCLP. | |
3 | * | |
4 | * Copyright IBM Corp. 2009 | |
5 | * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> | |
6 | * | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/stat.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/ctype.h> | |
15 | #include <linux/kmod.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/proc_fs.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/utsname.h> | |
21 | #include "sclp.h" | |
22 | ||
23 | static int callhome_enabled; | |
24 | static struct sclp_req *request; | |
25 | static struct sclp_async_sccb *sccb; | |
26 | static int sclp_async_send_wait(char *message); | |
27 | static struct ctl_table_header *callhome_sysctl_header; | |
28 | static DEFINE_SPINLOCK(sclp_async_lock); | |
c114728a HJP |
29 | #define SCLP_NORMAL_WRITE 0x00 |
30 | ||
31 | struct async_evbuf { | |
32 | struct evbuf_header header; | |
33 | u64 reserved; | |
34 | u8 rflags; | |
35 | u8 empty; | |
36 | u8 rtype; | |
37 | u8 otype; | |
38 | char comp_id[12]; | |
39 | char data[3000]; /* there is still some space left */ | |
40 | } __attribute__((packed)); | |
41 | ||
42 | struct sclp_async_sccb { | |
43 | struct sccb_header header; | |
44 | struct async_evbuf evbuf; | |
45 | } __attribute__((packed)); | |
46 | ||
47 | static struct sclp_register sclp_async_register = { | |
48 | .send_mask = EVTYP_ASYNC_MASK, | |
49 | }; | |
50 | ||
51 | static int call_home_on_panic(struct notifier_block *self, | |
52 | unsigned long event, void *data) | |
53 | { | |
e8a79c9e HC |
54 | strncat(data, init_utsname()->nodename, |
55 | sizeof(init_utsname()->nodename)); | |
56 | sclp_async_send_wait(data); | |
57 | return NOTIFY_DONE; | |
c114728a HJP |
58 | } |
59 | ||
60 | static struct notifier_block call_home_panic_nb = { | |
61 | .notifier_call = call_home_on_panic, | |
62 | .priority = INT_MAX, | |
63 | }; | |
64 | ||
d3acf71f | 65 | static int proc_handler_callhome(struct ctl_table *ctl, int write, |
c114728a HJP |
66 | void __user *buffer, size_t *count, |
67 | loff_t *ppos) | |
68 | { | |
69 | unsigned long val; | |
70 | int len, rc; | |
3f0b3c33 | 71 | char buf[3]; |
c114728a | 72 | |
3f0b3c33 | 73 | if (!*count || (*ppos && !write)) { |
c114728a HJP |
74 | *count = 0; |
75 | return 0; | |
76 | } | |
77 | if (!write) { | |
3f0b3c33 | 78 | len = snprintf(buf, sizeof(buf), "%d\n", callhome_enabled); |
c114728a HJP |
79 | rc = copy_to_user(buffer, buf, sizeof(buf)); |
80 | if (rc != 0) | |
81 | return -EFAULT; | |
82 | } else { | |
83 | len = *count; | |
84 | rc = copy_from_user(buf, buffer, sizeof(buf)); | |
85 | if (rc != 0) | |
86 | return -EFAULT; | |
87 | if (strict_strtoul(buf, 0, &val) != 0) | |
88 | return -EINVAL; | |
89 | if (val != 0 && val != 1) | |
90 | return -EINVAL; | |
91 | callhome_enabled = val; | |
92 | } | |
93 | *count = len; | |
94 | *ppos += len; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static struct ctl_table callhome_table[] = { | |
99 | { | |
100 | .procname = "callhome", | |
101 | .mode = 0644, | |
d3acf71f | 102 | .proc_handler = proc_handler_callhome, |
c114728a HJP |
103 | }, |
104 | { .ctl_name = 0 } | |
105 | }; | |
106 | ||
107 | static struct ctl_table kern_dir_table[] = { | |
108 | { | |
109 | .ctl_name = CTL_KERN, | |
110 | .procname = "kernel", | |
111 | .maxlen = 0, | |
112 | .mode = 0555, | |
113 | .child = callhome_table, | |
114 | }, | |
115 | { .ctl_name = 0 } | |
116 | }; | |
117 | ||
118 | /* | |
119 | * Function used to transfer asynchronous notification | |
120 | * records which waits for send completion | |
121 | */ | |
122 | static int sclp_async_send_wait(char *message) | |
123 | { | |
124 | struct async_evbuf *evb; | |
125 | int rc; | |
126 | unsigned long flags; | |
127 | ||
128 | if (!callhome_enabled) | |
129 | return 0; | |
130 | sccb->evbuf.header.type = EVTYP_ASYNC; | |
131 | sccb->evbuf.rtype = 0xA5; | |
132 | sccb->evbuf.otype = 0x00; | |
133 | evb = &sccb->evbuf; | |
134 | request->command = SCLP_CMDW_WRITE_EVENT_DATA; | |
135 | request->sccb = sccb; | |
136 | request->status = SCLP_REQ_FILLED; | |
137 | strncpy(sccb->evbuf.data, message, sizeof(sccb->evbuf.data)); | |
138 | /* | |
139 | * Retain Queue | |
140 | * e.g. 5639CC140 500 Red Hat RHEL5 Linux for zSeries (RHEL AS) | |
141 | */ | |
142 | strncpy(sccb->evbuf.comp_id, "000000000", sizeof(sccb->evbuf.comp_id)); | |
143 | sccb->evbuf.header.length = sizeof(sccb->evbuf); | |
144 | sccb->header.length = sizeof(sccb->evbuf) + sizeof(sccb->header); | |
145 | sccb->header.function_code = SCLP_NORMAL_WRITE; | |
146 | rc = sclp_add_request(request); | |
147 | if (rc) | |
148 | return rc; | |
149 | spin_lock_irqsave(&sclp_async_lock, flags); | |
150 | while (request->status != SCLP_REQ_DONE && | |
151 | request->status != SCLP_REQ_FAILED) { | |
152 | sclp_sync_wait(); | |
153 | } | |
154 | spin_unlock_irqrestore(&sclp_async_lock, flags); | |
155 | if (request->status != SCLP_REQ_DONE) | |
156 | return -EIO; | |
157 | rc = ((struct sclp_async_sccb *) | |
158 | request->sccb)->header.response_code; | |
159 | if (rc != 0x0020) | |
160 | return -EIO; | |
161 | if (evb->header.flags != 0x80) | |
162 | return -EIO; | |
163 | return rc; | |
164 | } | |
165 | ||
166 | static int __init sclp_async_init(void) | |
167 | { | |
168 | int rc; | |
169 | ||
170 | rc = sclp_register(&sclp_async_register); | |
171 | if (rc) | |
172 | return rc; | |
4a0fb4c4 HC |
173 | rc = -EOPNOTSUPP; |
174 | if (!(sclp_async_register.sclp_receive_mask & EVTYP_ASYNC_MASK)) | |
c114728a | 175 | goto out_sclp; |
c114728a | 176 | rc = -ENOMEM; |
4a0fb4c4 HC |
177 | callhome_sysctl_header = register_sysctl_table(kern_dir_table); |
178 | if (!callhome_sysctl_header) | |
179 | goto out_sclp; | |
c114728a | 180 | request = kzalloc(sizeof(struct sclp_req), GFP_KERNEL); |
c114728a | 181 | sccb = (struct sclp_async_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
4a0fb4c4 | 182 | if (!request || !sccb) |
c114728a | 183 | goto out_mem; |
4a0fb4c4 HC |
184 | rc = atomic_notifier_chain_register(&panic_notifier_list, |
185 | &call_home_panic_nb); | |
e8a79c9e HC |
186 | if (!rc) |
187 | goto out; | |
c114728a HJP |
188 | out_mem: |
189 | kfree(request); | |
190 | free_page((unsigned long) sccb); | |
c114728a HJP |
191 | unregister_sysctl_table(callhome_sysctl_header); |
192 | out_sclp: | |
193 | sclp_unregister(&sclp_async_register); | |
4a0fb4c4 | 194 | out: |
c114728a | 195 | return rc; |
c114728a HJP |
196 | } |
197 | module_init(sclp_async_init); | |
198 | ||
199 | static void __exit sclp_async_exit(void) | |
200 | { | |
201 | atomic_notifier_chain_unregister(&panic_notifier_list, | |
202 | &call_home_panic_nb); | |
203 | unregister_sysctl_table(callhome_sysctl_header); | |
204 | sclp_unregister(&sclp_async_register); | |
205 | free_page((unsigned long) sccb); | |
206 | kfree(request); | |
207 | } | |
208 | module_exit(sclp_async_exit); | |
209 | ||
210 | MODULE_AUTHOR("Copyright IBM Corp. 2009"); | |
211 | MODULE_AUTHOR("Hans-Joachim Picht <hans@linux.vnet.ibm.com>"); | |
212 | MODULE_LICENSE("GPL"); | |
213 | MODULE_DESCRIPTION("SCLP Asynchronous Notification Records"); |