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authorMichael Ernst <mernst@de.ibm.com>2008-01-26 08:10:55 -0500
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-01-26 08:11:08 -0500
commitc05ffc4f2b208da8ba7d3a9b5ab886c76f8939b5 (patch)
tree4cd35a23eaf7eb3b5a15f30e82a676b590622448 /drivers/s390/char/sclp_cpi.c
parentdfa77f611ff295598e218aa0eb6efa73a5cf26d0 (diff)
[S390] sclp: sysfs interface for SCLP cpi
Signed-off-by: Michael Ernst <mernst@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/sclp_cpi.c')
-rw-r--r--drivers/s390/char/sclp_cpi.c246
1 files changed, 16 insertions, 230 deletions
diff --git a/drivers/s390/char/sclp_cpi.c b/drivers/s390/char/sclp_cpi.c
index 82a13d9fdfe4..5716487b8c9d 100644
--- a/drivers/s390/char/sclp_cpi.c
+++ b/drivers/s390/char/sclp_cpi.c
@@ -1,255 +1,41 @@
1/* 1/*
2 * Author: Martin Peschke <mpeschke@de.ibm.com> 2 * drivers/s390/char/sclp_cpi.c
3 * Copyright (C) 2001 IBM Entwicklung GmbH, IBM Corporation 3 * SCLP control programm identification
4 * 4 *
5 * SCLP Control-Program Identification. 5 * Copyright IBM Corp. 2001, 2007
6 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
7 * Michael Ernst <mernst@de.ibm.com>
6 */ 8 */
7 9
8#include <linux/version.h>
9#include <linux/kmod.h> 10#include <linux/kmod.h>
10#include <linux/module.h> 11#include <linux/module.h>
11#include <linux/moduleparam.h> 12#include <linux/moduleparam.h>
12#include <linux/init.h> 13#include <linux/version.h>
13#include <linux/timer.h> 14#include "sclp_cpi_sys.h"
14#include <linux/string.h>
15#include <linux/err.h>
16#include <linux/slab.h>
17#include <asm/ebcdic.h>
18#include <asm/semaphore.h>
19
20#include "sclp.h"
21#include "sclp_rw.h"
22
23#define CPI_LENGTH_SYSTEM_TYPE 8
24#define CPI_LENGTH_SYSTEM_NAME 8
25#define CPI_LENGTH_SYSPLEX_NAME 8
26
27struct cpi_evbuf {
28 struct evbuf_header header;
29 u8 id_format;
30 u8 reserved0;
31 u8 system_type[CPI_LENGTH_SYSTEM_TYPE];
32 u64 reserved1;
33 u8 system_name[CPI_LENGTH_SYSTEM_NAME];
34 u64 reserved2;
35 u64 system_level;
36 u64 reserved3;
37 u8 sysplex_name[CPI_LENGTH_SYSPLEX_NAME];
38 u8 reserved4[16];
39} __attribute__((packed));
40
41struct cpi_sccb {
42 struct sccb_header header;
43 struct cpi_evbuf cpi_evbuf;
44} __attribute__((packed));
45
46/* Event type structure for write message and write priority message */
47static struct sclp_register sclp_cpi_event =
48{
49 .send_mask = EVTYP_CTLPROGIDENT_MASK
50};
51 15
52MODULE_LICENSE("GPL"); 16MODULE_LICENSE("GPL");
17MODULE_DESCRIPTION("Identify this operating system instance "
18 "to the System z hardware");
19MODULE_AUTHOR("Martin Peschke <mpeschke@de.ibm.com>, "
20 "Michael Ernst <mernst@de.ibm.com>");
53 21
54MODULE_AUTHOR( 22static char *system_name = "";
55 "Martin Peschke, IBM Deutschland Entwicklung GmbH " 23static char *sysplex_name = "";
56 "<mpeschke@de.ibm.com>");
57
58MODULE_DESCRIPTION(
59 "identify this operating system instance to the S/390 "
60 "or zSeries hardware");
61 24
62static char *system_name = NULL;
63module_param(system_name, charp, 0); 25module_param(system_name, charp, 0);
64MODULE_PARM_DESC(system_name, "e.g. hostname - max. 8 characters"); 26MODULE_PARM_DESC(system_name, "e.g. hostname - max. 8 characters");
65
66static char *sysplex_name = NULL;
67#ifdef ALLOW_SYSPLEX_NAME
68module_param(sysplex_name, charp, 0); 27module_param(sysplex_name, charp, 0);
69MODULE_PARM_DESC(sysplex_name, "if applicable - max. 8 characters"); 28MODULE_PARM_DESC(sysplex_name, "if applicable - max. 8 characters");
70#endif
71
72/* use default value for this field (as well as for system level) */
73static char *system_type = "LINUX";
74 29
75static int 30static int __init cpi_module_init(void)
76cpi_check_parms(void)
77{ 31{
78 /* reject if no system type specified */ 32 return sclp_cpi_set_data(system_name, sysplex_name, "LINUX",
79 if (!system_type) { 33 LINUX_VERSION_CODE);
80 printk("cpi: bug: no system type specified\n");
81 return -EINVAL;
82 }
83
84 /* reject if system type larger than 8 characters */
85 if (strlen(system_type) > CPI_LENGTH_SYSTEM_NAME) {
86 printk("cpi: bug: system type has length of %li characters - "
87 "only %i characters supported\n",
88 strlen(system_type), CPI_LENGTH_SYSTEM_TYPE);
89 return -EINVAL;
90 }
91
92 /* reject if no system name specified */
93 if (!system_name) {
94 printk("cpi: no system name specified\n");
95 return -EINVAL;
96 }
97
98 /* reject if system name larger than 8 characters */
99 if (strlen(system_name) > CPI_LENGTH_SYSTEM_NAME) {
100 printk("cpi: system name has length of %li characters - "
101 "only %i characters supported\n",
102 strlen(system_name), CPI_LENGTH_SYSTEM_NAME);
103 return -EINVAL;
104 }
105
106 /* reject if specified sysplex name larger than 8 characters */
107 if (sysplex_name && strlen(sysplex_name) > CPI_LENGTH_SYSPLEX_NAME) {
108 printk("cpi: sysplex name has length of %li characters"
109 " - only %i characters supported\n",
110 strlen(sysplex_name), CPI_LENGTH_SYSPLEX_NAME);
111 return -EINVAL;
112 }
113 return 0;
114} 34}
115 35
116static void
117cpi_callback(struct sclp_req *req, void *data)
118{
119 struct semaphore *sem;
120
121 sem = (struct semaphore *) data;
122 up(sem);
123}
124
125static struct sclp_req *
126cpi_prepare_req(void)
127{
128 struct sclp_req *req;
129 struct cpi_sccb *sccb;
130 struct cpi_evbuf *evb;
131
132 req = kmalloc(sizeof(struct sclp_req), GFP_KERNEL);
133 if (req == NULL)
134 return ERR_PTR(-ENOMEM);
135 sccb = (struct cpi_sccb *) __get_free_page(GFP_KERNEL | GFP_DMA);
136 if (sccb == NULL) {
137 kfree(req);
138 return ERR_PTR(-ENOMEM);
139 }
140 memset(sccb, 0, sizeof(struct cpi_sccb));
141
142 /* setup SCCB for Control-Program Identification */
143 sccb->header.length = sizeof(struct cpi_sccb);
144 sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf);
145 sccb->cpi_evbuf.header.type = 0x0B;
146 evb = &sccb->cpi_evbuf;
147
148 /* set system type */
149 memset(evb->system_type, ' ', CPI_LENGTH_SYSTEM_TYPE);
150 memcpy(evb->system_type, system_type, strlen(system_type));
151 sclp_ascebc_str(evb->system_type, CPI_LENGTH_SYSTEM_TYPE);
152 EBC_TOUPPER(evb->system_type, CPI_LENGTH_SYSTEM_TYPE);
153
154 /* set system name */
155 memset(evb->system_name, ' ', CPI_LENGTH_SYSTEM_NAME);
156 memcpy(evb->system_name, system_name, strlen(system_name));
157 sclp_ascebc_str(evb->system_name, CPI_LENGTH_SYSTEM_NAME);
158 EBC_TOUPPER(evb->system_name, CPI_LENGTH_SYSTEM_NAME);
159
160 /* set system level */
161 evb->system_level = LINUX_VERSION_CODE;
162
163 /* set sysplex name */
164 if (sysplex_name) {
165 memset(evb->sysplex_name, ' ', CPI_LENGTH_SYSPLEX_NAME);
166 memcpy(evb->sysplex_name, sysplex_name, strlen(sysplex_name));
167 sclp_ascebc_str(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
168 EBC_TOUPPER(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
169 }
170
171 /* prepare request data structure presented to SCLP driver */
172 req->command = SCLP_CMDW_WRITE_EVENT_DATA;
173 req->sccb = sccb;
174 req->status = SCLP_REQ_FILLED;
175 req->callback = cpi_callback;
176 return req;
177}
178
179static void
180cpi_free_req(struct sclp_req *req)
181{
182 free_page((unsigned long) req->sccb);
183 kfree(req);
184}
185
186static int __init
187cpi_module_init(void)
188{
189 struct semaphore sem;
190 struct sclp_req *req;
191 int rc;
192
193 rc = cpi_check_parms();
194 if (rc)
195 return rc;
196
197 rc = sclp_register(&sclp_cpi_event);
198 if (rc) {
199 /* could not register sclp event. Die. */
200 printk(KERN_WARNING "cpi: could not register to hardware "
201 "console.\n");
202 return -EINVAL;
203 }
204 if (!(sclp_cpi_event.sclp_send_mask & EVTYP_CTLPROGIDENT_MASK)) {
205 printk(KERN_WARNING "cpi: no control program identification "
206 "support\n");
207 sclp_unregister(&sclp_cpi_event);
208 return -EOPNOTSUPP;
209 }
210
211 req = cpi_prepare_req();
212 if (IS_ERR(req)) {
213 printk(KERN_WARNING "cpi: couldn't allocate request\n");
214 sclp_unregister(&sclp_cpi_event);
215 return PTR_ERR(req);
216 }
217
218 /* Prepare semaphore */
219 sema_init(&sem, 0);
220 req->callback_data = &sem;
221 /* Add request to sclp queue */
222 rc = sclp_add_request(req);
223 if (rc) {
224 printk(KERN_WARNING "cpi: could not start request\n");
225 cpi_free_req(req);
226 sclp_unregister(&sclp_cpi_event);
227 return rc;
228 }
229 /* make "insmod" sleep until callback arrives */
230 down(&sem);
231
232 rc = ((struct cpi_sccb *) req->sccb)->header.response_code;
233 if (rc != 0x0020) {
234 printk(KERN_WARNING "cpi: failed with response code 0x%x\n",
235 rc);
236 rc = -ECOMM;
237 } else
238 rc = 0;
239
240 cpi_free_req(req);
241 sclp_unregister(&sclp_cpi_event);
242
243 return rc;
244}
245
246
247static void __exit cpi_module_exit(void) 36static void __exit cpi_module_exit(void)
248{ 37{
249} 38}
250 39
251
252/* declare driver module init/cleanup functions */
253module_init(cpi_module_init); 40module_init(cpi_module_init);
254module_exit(cpi_module_exit); 41module_exit(cpi_module_exit);
255
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