1 /*
2 * copyright (c) 2006 IBM Corporation
3 * Authored by: Mike D. Day <ncmike@us.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/kobject.h>
14
15 #include <asm/xen/hypervisor.h>
16 #include <asm/xen/hypercall.h>
17
18 #include <xen/xen.h>
19 #include <xen/xenbus.h>
20 #include <xen/interface/xen.h>
21 #include <xen/interface/version.h>
22
23 #define HYPERVISOR_ATTR_RO(_name) \
24 static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
25
26 #define HYPERVISOR_ATTR_RW(_name) \
27 static struct hyp_sysfs_attr _name##_attr = \
28 __ATTR(_name, 0644, _name##_show, _name##_store)
29
30 struct hyp_sysfs_attr {
31 struct attribute attr;
32 ssize_t (*show)(struct hyp_sysfs_attr *, char *);
33 ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
34 void *hyp_attr_data;
35 };
36
type_show(struct hyp_sysfs_attr * attr,char * buffer)37 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
38 {
39 return sprintf(buffer, "xen\n");
40 }
41
42 HYPERVISOR_ATTR_RO(type);
43
xen_sysfs_type_init(void)44 static int __init xen_sysfs_type_init(void)
45 {
46 return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
47 }
48
xen_sysfs_type_destroy(void)49 static void xen_sysfs_type_destroy(void)
50 {
51 sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
52 }
53
54 /* xen version attributes */
major_show(struct hyp_sysfs_attr * attr,char * buffer)55 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
56 {
57 int version = HYPERVISOR_xen_version(XENVER_version, NULL);
58 if (version)
59 return sprintf(buffer, "%d\n", version >> 16);
60 return -ENODEV;
61 }
62
63 HYPERVISOR_ATTR_RO(major);
64
minor_show(struct hyp_sysfs_attr * attr,char * buffer)65 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
66 {
67 int version = HYPERVISOR_xen_version(XENVER_version, NULL);
68 if (version)
69 return sprintf(buffer, "%d\n", version & 0xff);
70 return -ENODEV;
71 }
72
73 HYPERVISOR_ATTR_RO(minor);
74
extra_show(struct hyp_sysfs_attr * attr,char * buffer)75 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
76 {
77 int ret = -ENOMEM;
78 char *extra;
79
80 extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
81 if (extra) {
82 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
83 if (!ret)
84 ret = sprintf(buffer, "%s\n", extra);
85 kfree(extra);
86 }
87
88 return ret;
89 }
90
91 HYPERVISOR_ATTR_RO(extra);
92
93 static struct attribute *version_attrs[] = {
94 &major_attr.attr,
95 &minor_attr.attr,
96 &extra_attr.attr,
97 NULL
98 };
99
100 static const struct attribute_group version_group = {
101 .name = "version",
102 .attrs = version_attrs,
103 };
104
xen_sysfs_version_init(void)105 static int __init xen_sysfs_version_init(void)
106 {
107 return sysfs_create_group(hypervisor_kobj, &version_group);
108 }
109
xen_sysfs_version_destroy(void)110 static void xen_sysfs_version_destroy(void)
111 {
112 sysfs_remove_group(hypervisor_kobj, &version_group);
113 }
114
115 /* UUID */
116
uuid_show(struct hyp_sysfs_attr * attr,char * buffer)117 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
118 {
119 char *vm, *val;
120 int ret;
121 extern int xenstored_ready;
122
123 if (!xenstored_ready)
124 return -EBUSY;
125
126 vm = xenbus_read(XBT_NIL, "vm", "", NULL);
127 if (IS_ERR(vm))
128 return PTR_ERR(vm);
129 val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
130 kfree(vm);
131 if (IS_ERR(val))
132 return PTR_ERR(val);
133 ret = sprintf(buffer, "%s\n", val);
134 kfree(val);
135 return ret;
136 }
137
138 HYPERVISOR_ATTR_RO(uuid);
139
xen_sysfs_uuid_init(void)140 static int __init xen_sysfs_uuid_init(void)
141 {
142 return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
143 }
144
xen_sysfs_uuid_destroy(void)145 static void xen_sysfs_uuid_destroy(void)
146 {
147 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
148 }
149
150 /* xen compilation attributes */
151
compiler_show(struct hyp_sysfs_attr * attr,char * buffer)152 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
153 {
154 int ret = -ENOMEM;
155 struct xen_compile_info *info;
156
157 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
158 if (info) {
159 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
160 if (!ret)
161 ret = sprintf(buffer, "%s\n", info->compiler);
162 kfree(info);
163 }
164
165 return ret;
166 }
167
168 HYPERVISOR_ATTR_RO(compiler);
169
compiled_by_show(struct hyp_sysfs_attr * attr,char * buffer)170 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
171 {
172 int ret = -ENOMEM;
173 struct xen_compile_info *info;
174
175 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
176 if (info) {
177 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
178 if (!ret)
179 ret = sprintf(buffer, "%s\n", info->compile_by);
180 kfree(info);
181 }
182
183 return ret;
184 }
185
186 HYPERVISOR_ATTR_RO(compiled_by);
187
compile_date_show(struct hyp_sysfs_attr * attr,char * buffer)188 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
189 {
190 int ret = -ENOMEM;
191 struct xen_compile_info *info;
192
193 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
194 if (info) {
195 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
196 if (!ret)
197 ret = sprintf(buffer, "%s\n", info->compile_date);
198 kfree(info);
199 }
200
201 return ret;
202 }
203
204 HYPERVISOR_ATTR_RO(compile_date);
205
206 static struct attribute *xen_compile_attrs[] = {
207 &compiler_attr.attr,
208 &compiled_by_attr.attr,
209 &compile_date_attr.attr,
210 NULL
211 };
212
213 static const struct attribute_group xen_compilation_group = {
214 .name = "compilation",
215 .attrs = xen_compile_attrs,
216 };
217
xen_compilation_init(void)218 static int __init xen_compilation_init(void)
219 {
220 return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
221 }
222
xen_compilation_destroy(void)223 static void xen_compilation_destroy(void)
224 {
225 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
226 }
227
228 /* xen properties info */
229
capabilities_show(struct hyp_sysfs_attr * attr,char * buffer)230 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
231 {
232 int ret = -ENOMEM;
233 char *caps;
234
235 caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
236 if (caps) {
237 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
238 if (!ret)
239 ret = sprintf(buffer, "%s\n", caps);
240 kfree(caps);
241 }
242
243 return ret;
244 }
245
246 HYPERVISOR_ATTR_RO(capabilities);
247
changeset_show(struct hyp_sysfs_attr * attr,char * buffer)248 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
249 {
250 int ret = -ENOMEM;
251 char *cset;
252
253 cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
254 if (cset) {
255 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
256 if (!ret)
257 ret = sprintf(buffer, "%s\n", cset);
258 kfree(cset);
259 }
260
261 return ret;
262 }
263
264 HYPERVISOR_ATTR_RO(changeset);
265
virtual_start_show(struct hyp_sysfs_attr * attr,char * buffer)266 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
267 {
268 int ret = -ENOMEM;
269 struct xen_platform_parameters *parms;
270
271 parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
272 if (parms) {
273 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
274 parms);
275 if (!ret)
276 ret = sprintf(buffer, "%lx\n", parms->virt_start);
277 kfree(parms);
278 }
279
280 return ret;
281 }
282
283 HYPERVISOR_ATTR_RO(virtual_start);
284
pagesize_show(struct hyp_sysfs_attr * attr,char * buffer)285 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
286 {
287 int ret;
288
289 ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
290 if (ret > 0)
291 ret = sprintf(buffer, "%x\n", ret);
292
293 return ret;
294 }
295
296 HYPERVISOR_ATTR_RO(pagesize);
297
xen_feature_show(int index,char * buffer)298 static ssize_t xen_feature_show(int index, char *buffer)
299 {
300 ssize_t ret;
301 struct xen_feature_info info;
302
303 info.submap_idx = index;
304 ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
305 if (!ret)
306 ret = sprintf(buffer, "%08x", info.submap);
307
308 return ret;
309 }
310
features_show(struct hyp_sysfs_attr * attr,char * buffer)311 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
312 {
313 ssize_t len;
314 int i;
315
316 len = 0;
317 for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
318 int ret = xen_feature_show(i, buffer + len);
319 if (ret < 0) {
320 if (len == 0)
321 len = ret;
322 break;
323 }
324 len += ret;
325 }
326 if (len > 0)
327 buffer[len++] = '\n';
328
329 return len;
330 }
331
332 HYPERVISOR_ATTR_RO(features);
333
334 static struct attribute *xen_properties_attrs[] = {
335 &capabilities_attr.attr,
336 &changeset_attr.attr,
337 &virtual_start_attr.attr,
338 &pagesize_attr.attr,
339 &features_attr.attr,
340 NULL
341 };
342
343 static const struct attribute_group xen_properties_group = {
344 .name = "properties",
345 .attrs = xen_properties_attrs,
346 };
347
xen_properties_init(void)348 static int __init xen_properties_init(void)
349 {
350 return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
351 }
352
xen_properties_destroy(void)353 static void xen_properties_destroy(void)
354 {
355 sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
356 }
357
hyper_sysfs_init(void)358 static int __init hyper_sysfs_init(void)
359 {
360 int ret;
361
362 if (!xen_domain())
363 return -ENODEV;
364
365 ret = xen_sysfs_type_init();
366 if (ret)
367 goto out;
368 ret = xen_sysfs_version_init();
369 if (ret)
370 goto version_out;
371 ret = xen_compilation_init();
372 if (ret)
373 goto comp_out;
374 ret = xen_sysfs_uuid_init();
375 if (ret)
376 goto uuid_out;
377 ret = xen_properties_init();
378 if (ret)
379 goto prop_out;
380
381 goto out;
382
383 prop_out:
384 xen_sysfs_uuid_destroy();
385 uuid_out:
386 xen_compilation_destroy();
387 comp_out:
388 xen_sysfs_version_destroy();
389 version_out:
390 xen_sysfs_type_destroy();
391 out:
392 return ret;
393 }
394
hyper_sysfs_exit(void)395 static void __exit hyper_sysfs_exit(void)
396 {
397 xen_properties_destroy();
398 xen_compilation_destroy();
399 xen_sysfs_uuid_destroy();
400 xen_sysfs_version_destroy();
401 xen_sysfs_type_destroy();
402
403 }
404 module_init(hyper_sysfs_init);
405 module_exit(hyper_sysfs_exit);
406
hyp_sysfs_show(struct kobject * kobj,struct attribute * attr,char * buffer)407 static ssize_t hyp_sysfs_show(struct kobject *kobj,
408 struct attribute *attr,
409 char *buffer)
410 {
411 struct hyp_sysfs_attr *hyp_attr;
412 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
413 if (hyp_attr->show)
414 return hyp_attr->show(hyp_attr, buffer);
415 return 0;
416 }
417
hyp_sysfs_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t len)418 static ssize_t hyp_sysfs_store(struct kobject *kobj,
419 struct attribute *attr,
420 const char *buffer,
421 size_t len)
422 {
423 struct hyp_sysfs_attr *hyp_attr;
424 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
425 if (hyp_attr->store)
426 return hyp_attr->store(hyp_attr, buffer, len);
427 return 0;
428 }
429
430 static const struct sysfs_ops hyp_sysfs_ops = {
431 .show = hyp_sysfs_show,
432 .store = hyp_sysfs_store,
433 };
434
435 static struct kobj_type hyp_sysfs_kobj_type = {
436 .sysfs_ops = &hyp_sysfs_ops,
437 };
438
hypervisor_subsys_init(void)439 static int __init hypervisor_subsys_init(void)
440 {
441 if (!xen_domain())
442 return -ENODEV;
443
444 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
445 return 0;
446 }
447 device_initcall(hypervisor_subsys_init);
448