]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/xen/sys-hypervisor.c
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[karo-tx-linux.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 #include <linux/err.h>
15
16 #include <asm/xen/hypervisor.h>
17 #include <asm/xen/hypercall.h>
18
19 #include <xen/xen.h>
20 #include <xen/xenbus.h>
21 #include <xen/interface/xen.h>
22 #include <xen/interface/version.h>
23
24 #define HYPERVISOR_ATTR_RO(_name) \
25 static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name)
26
27 #define HYPERVISOR_ATTR_RW(_name) \
28 static struct hyp_sysfs_attr _name##_attr = \
29         __ATTR(_name, 0644, _name##_show, _name##_store)
30
31 struct hyp_sysfs_attr {
32         struct attribute attr;
33         ssize_t (*show)(struct hyp_sysfs_attr *, char *);
34         ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
35         void *hyp_attr_data;
36 };
37
38 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
39 {
40         return sprintf(buffer, "xen\n");
41 }
42
43 HYPERVISOR_ATTR_RO(type);
44
45 static int __init xen_sysfs_type_init(void)
46 {
47         return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
48 }
49
50 static void xen_sysfs_type_destroy(void)
51 {
52         sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
53 }
54
55 /* xen version attributes */
56 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
57 {
58         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
59         if (version)
60                 return sprintf(buffer, "%d\n", version >> 16);
61         return -ENODEV;
62 }
63
64 HYPERVISOR_ATTR_RO(major);
65
66 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
67 {
68         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
69         if (version)
70                 return sprintf(buffer, "%d\n", version & 0xff);
71         return -ENODEV;
72 }
73
74 HYPERVISOR_ATTR_RO(minor);
75
76 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
77 {
78         int ret = -ENOMEM;
79         char *extra;
80
81         extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
82         if (extra) {
83                 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
84                 if (!ret)
85                         ret = sprintf(buffer, "%s\n", extra);
86                 kfree(extra);
87         }
88
89         return ret;
90 }
91
92 HYPERVISOR_ATTR_RO(extra);
93
94 static struct attribute *version_attrs[] = {
95         &major_attr.attr,
96         &minor_attr.attr,
97         &extra_attr.attr,
98         NULL
99 };
100
101 static const struct attribute_group version_group = {
102         .name = "version",
103         .attrs = version_attrs,
104 };
105
106 static int __init xen_sysfs_version_init(void)
107 {
108         return sysfs_create_group(hypervisor_kobj, &version_group);
109 }
110
111 static void xen_sysfs_version_destroy(void)
112 {
113         sysfs_remove_group(hypervisor_kobj, &version_group);
114 }
115
116 /* UUID */
117
118 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
119 {
120         char *vm, *val;
121         int ret;
122         extern int xenstored_ready;
123
124         if (!xenstored_ready)
125                 return -EBUSY;
126
127         vm = xenbus_read(XBT_NIL, "vm", "", NULL);
128         if (IS_ERR(vm))
129                 return PTR_ERR(vm);
130         val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
131         kfree(vm);
132         if (IS_ERR(val))
133                 return PTR_ERR(val);
134         ret = sprintf(buffer, "%s\n", val);
135         kfree(val);
136         return ret;
137 }
138
139 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
140 {
141         xen_domain_handle_t uuid;
142         int ret;
143         ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
144         if (ret)
145                 return uuid_show_fallback(attr, buffer);
146         ret = sprintf(buffer, "%pU\n", uuid);
147         return ret;
148 }
149
150 HYPERVISOR_ATTR_RO(uuid);
151
152 static int __init xen_sysfs_uuid_init(void)
153 {
154         return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
155 }
156
157 static void xen_sysfs_uuid_destroy(void)
158 {
159         sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
160 }
161
162 /* xen compilation attributes */
163
164 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
165 {
166         int ret = -ENOMEM;
167         struct xen_compile_info *info;
168
169         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
170         if (info) {
171                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
172                 if (!ret)
173                         ret = sprintf(buffer, "%s\n", info->compiler);
174                 kfree(info);
175         }
176
177         return ret;
178 }
179
180 HYPERVISOR_ATTR_RO(compiler);
181
182 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
183 {
184         int ret = -ENOMEM;
185         struct xen_compile_info *info;
186
187         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
188         if (info) {
189                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
190                 if (!ret)
191                         ret = sprintf(buffer, "%s\n", info->compile_by);
192                 kfree(info);
193         }
194
195         return ret;
196 }
197
198 HYPERVISOR_ATTR_RO(compiled_by);
199
200 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
201 {
202         int ret = -ENOMEM;
203         struct xen_compile_info *info;
204
205         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
206         if (info) {
207                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
208                 if (!ret)
209                         ret = sprintf(buffer, "%s\n", info->compile_date);
210                 kfree(info);
211         }
212
213         return ret;
214 }
215
216 HYPERVISOR_ATTR_RO(compile_date);
217
218 static struct attribute *xen_compile_attrs[] = {
219         &compiler_attr.attr,
220         &compiled_by_attr.attr,
221         &compile_date_attr.attr,
222         NULL
223 };
224
225 static const struct attribute_group xen_compilation_group = {
226         .name = "compilation",
227         .attrs = xen_compile_attrs,
228 };
229
230 static int __init xen_compilation_init(void)
231 {
232         return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
233 }
234
235 static void xen_compilation_destroy(void)
236 {
237         sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
238 }
239
240 /* xen properties info */
241
242 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
243 {
244         int ret = -ENOMEM;
245         char *caps;
246
247         caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
248         if (caps) {
249                 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
250                 if (!ret)
251                         ret = sprintf(buffer, "%s\n", caps);
252                 kfree(caps);
253         }
254
255         return ret;
256 }
257
258 HYPERVISOR_ATTR_RO(capabilities);
259
260 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
261 {
262         int ret = -ENOMEM;
263         char *cset;
264
265         cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
266         if (cset) {
267                 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
268                 if (!ret)
269                         ret = sprintf(buffer, "%s\n", cset);
270                 kfree(cset);
271         }
272
273         return ret;
274 }
275
276 HYPERVISOR_ATTR_RO(changeset);
277
278 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
279 {
280         int ret = -ENOMEM;
281         struct xen_platform_parameters *parms;
282
283         parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
284         if (parms) {
285                 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
286                                              parms);
287                 if (!ret)
288                         ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
289                                       parms->virt_start);
290                 kfree(parms);
291         }
292
293         return ret;
294 }
295
296 HYPERVISOR_ATTR_RO(virtual_start);
297
298 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
299 {
300         int ret;
301
302         ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
303         if (ret > 0)
304                 ret = sprintf(buffer, "%x\n", ret);
305
306         return ret;
307 }
308
309 HYPERVISOR_ATTR_RO(pagesize);
310
311 static ssize_t xen_feature_show(int index, char *buffer)
312 {
313         ssize_t ret;
314         struct xen_feature_info info;
315
316         info.submap_idx = index;
317         ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
318         if (!ret)
319                 ret = sprintf(buffer, "%08x", info.submap);
320
321         return ret;
322 }
323
324 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
325 {
326         ssize_t len;
327         int i;
328
329         len = 0;
330         for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
331                 int ret = xen_feature_show(i, buffer + len);
332                 if (ret < 0) {
333                         if (len == 0)
334                                 len = ret;
335                         break;
336                 }
337                 len += ret;
338         }
339         if (len > 0)
340                 buffer[len++] = '\n';
341
342         return len;
343 }
344
345 HYPERVISOR_ATTR_RO(features);
346
347 static struct attribute *xen_properties_attrs[] = {
348         &capabilities_attr.attr,
349         &changeset_attr.attr,
350         &virtual_start_attr.attr,
351         &pagesize_attr.attr,
352         &features_attr.attr,
353         NULL
354 };
355
356 static const struct attribute_group xen_properties_group = {
357         .name = "properties",
358         .attrs = xen_properties_attrs,
359 };
360
361 static int __init xen_properties_init(void)
362 {
363         return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
364 }
365
366 static void xen_properties_destroy(void)
367 {
368         sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
369 }
370
371 static int __init hyper_sysfs_init(void)
372 {
373         int ret;
374
375         if (!xen_domain())
376                 return -ENODEV;
377
378         ret = xen_sysfs_type_init();
379         if (ret)
380                 goto out;
381         ret = xen_sysfs_version_init();
382         if (ret)
383                 goto version_out;
384         ret = xen_compilation_init();
385         if (ret)
386                 goto comp_out;
387         ret = xen_sysfs_uuid_init();
388         if (ret)
389                 goto uuid_out;
390         ret = xen_properties_init();
391         if (ret)
392                 goto prop_out;
393
394         goto out;
395
396 prop_out:
397         xen_sysfs_uuid_destroy();
398 uuid_out:
399         xen_compilation_destroy();
400 comp_out:
401         xen_sysfs_version_destroy();
402 version_out:
403         xen_sysfs_type_destroy();
404 out:
405         return ret;
406 }
407
408 static void __exit hyper_sysfs_exit(void)
409 {
410         xen_properties_destroy();
411         xen_compilation_destroy();
412         xen_sysfs_uuid_destroy();
413         xen_sysfs_version_destroy();
414         xen_sysfs_type_destroy();
415
416 }
417 module_init(hyper_sysfs_init);
418 module_exit(hyper_sysfs_exit);
419
420 static ssize_t hyp_sysfs_show(struct kobject *kobj,
421                               struct attribute *attr,
422                               char *buffer)
423 {
424         struct hyp_sysfs_attr *hyp_attr;
425         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
426         if (hyp_attr->show)
427                 return hyp_attr->show(hyp_attr, buffer);
428         return 0;
429 }
430
431 static ssize_t hyp_sysfs_store(struct kobject *kobj,
432                                struct attribute *attr,
433                                const char *buffer,
434                                size_t len)
435 {
436         struct hyp_sysfs_attr *hyp_attr;
437         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
438         if (hyp_attr->store)
439                 return hyp_attr->store(hyp_attr, buffer, len);
440         return 0;
441 }
442
443 static const struct sysfs_ops hyp_sysfs_ops = {
444         .show = hyp_sysfs_show,
445         .store = hyp_sysfs_store,
446 };
447
448 static struct kobj_type hyp_sysfs_kobj_type = {
449         .sysfs_ops = &hyp_sysfs_ops,
450 };
451
452 static int __init hypervisor_subsys_init(void)
453 {
454         if (!xen_domain())
455                 return -ENODEV;
456
457         hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
458         return 0;
459 }
460 device_initcall(hypervisor_subsys_init);