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) \
25static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name)
26
27#define HYPERVISOR_ATTR_RW(_name) \
28static struct hyp_sysfs_attr _name##_attr = \
29	__ATTR(_name, 0644, _name##_show, _name##_store)
30
31struct 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
38static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
39{
40	return sprintf(buffer, "xen\n");
41}
42
43HYPERVISOR_ATTR_RO(type);
44
45static int __init xen_sysfs_type_init(void)
46{
47	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
48}
49
50static void xen_sysfs_type_destroy(void)
51{
52	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
53}
54
55/* xen version attributes */
56static 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
64HYPERVISOR_ATTR_RO(major);
65
66static 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
74HYPERVISOR_ATTR_RO(minor);
75
76static 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
92HYPERVISOR_ATTR_RO(extra);
93
94static struct attribute *version_attrs[] = {
95	&major_attr.attr,
96	&minor_attr.attr,
97	&extra_attr.attr,
98	NULL
99};
100
101static const struct attribute_group version_group = {
102	.name = "version",
103	.attrs = version_attrs,
104};
105
106static int __init xen_sysfs_version_init(void)
107{
108	return sysfs_create_group(hypervisor_kobj, &version_group);
109}
110
111static void xen_sysfs_version_destroy(void)
112{
113	sysfs_remove_group(hypervisor_kobj, &version_group);
114}
115
116/* UUID */
117
118static 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
139static 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
150HYPERVISOR_ATTR_RO(uuid);
151
152static int __init xen_sysfs_uuid_init(void)
153{
154	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
155}
156
157static void xen_sysfs_uuid_destroy(void)
158{
159	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
160}
161
162/* xen compilation attributes */
163
164static 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
180HYPERVISOR_ATTR_RO(compiler);
181
182static 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
198HYPERVISOR_ATTR_RO(compiled_by);
199
200static 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
216HYPERVISOR_ATTR_RO(compile_date);
217
218static struct attribute *xen_compile_attrs[] = {
219	&compiler_attr.attr,
220	&compiled_by_attr.attr,
221	&compile_date_attr.attr,
222	NULL
223};
224
225static const struct attribute_group xen_compilation_group = {
226	.name = "compilation",
227	.attrs = xen_compile_attrs,
228};
229
230static int __init xen_compilation_init(void)
231{
232	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
233}
234
235static void xen_compilation_destroy(void)
236{
237	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
238}
239
240/* xen properties info */
241
242static 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
258HYPERVISOR_ATTR_RO(capabilities);
259
260static 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
276HYPERVISOR_ATTR_RO(changeset);
277
278static 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
296HYPERVISOR_ATTR_RO(virtual_start);
297
298static 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
309HYPERVISOR_ATTR_RO(pagesize);
310
311static 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
324static 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
345HYPERVISOR_ATTR_RO(features);
346
347static 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
356static const struct attribute_group xen_properties_group = {
357	.name = "properties",
358	.attrs = xen_properties_attrs,
359};
360
361static int __init xen_properties_init(void)
362{
363	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
364}
365
366static void xen_properties_destroy(void)
367{
368	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
369}
370
371static 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
396prop_out:
397	xen_sysfs_uuid_destroy();
398uuid_out:
399	xen_compilation_destroy();
400comp_out:
401	xen_sysfs_version_destroy();
402version_out:
403	xen_sysfs_type_destroy();
404out:
405	return ret;
406}
407
408static 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}
417module_init(hyper_sysfs_init);
418module_exit(hyper_sysfs_exit);
419
420static 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
431static 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
443static const struct sysfs_ops hyp_sysfs_ops = {
444	.show = hyp_sysfs_show,
445	.store = hyp_sysfs_store,
446};
447
448static struct kobj_type hyp_sysfs_kobj_type = {
449	.sysfs_ops = &hyp_sysfs_ops,
450};
451
452static 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}
460device_initcall(hypervisor_subsys_init);
461