Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-2.6.git] / drivers / xen / sys-hypervisor.c
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
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
44 static int __init xen_sysfs_type_init(void)
45 {
46         return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
47 }
48
49 static void xen_sysfs_type_destroy(void)
50 {
51         sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
52 }
53
54 /* xen version attributes */
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
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
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 struct attribute_group version_group = {
101         .name = "version",
102         .attrs = version_attrs,
103 };
104
105 static int __init xen_sysfs_version_init(void)
106 {
107         return sysfs_create_group(hypervisor_kobj, &version_group);
108 }
109
110 static void xen_sysfs_version_destroy(void)
111 {
112         sysfs_remove_group(hypervisor_kobj, &version_group);
113 }
114
115 /* UUID */
116
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
140 static int __init xen_sysfs_uuid_init(void)
141 {
142         return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
143 }
144
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
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
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
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 struct attribute_group xen_compilation_group = {
214         .name = "compilation",
215         .attrs = xen_compile_attrs,
216 };
217
218 static int __init xen_compilation_init(void)
219 {
220         return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
221 }
222
223 static void xen_compilation_destroy(void)
224 {
225         sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
226 }
227
228 /* xen properties info */
229
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
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
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
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
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
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 struct attribute_group xen_properties_group = {
344         .name = "properties",
345         .attrs = xen_properties_attrs,
346 };
347
348 static int __init xen_properties_init(void)
349 {
350         return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
351 }
352
353 static void xen_properties_destroy(void)
354 {
355         sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
356 }
357
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
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
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
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
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);