Root/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) \
24static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
25
26#define HYPERVISOR_ATTR_RW(_name) \
27static struct hyp_sysfs_attr _name##_attr = \
28    __ATTR(_name, 0644, _name##_show, _name##_store)
29
30struct 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
37static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
38{
39    return sprintf(buffer, "xen\n");
40}
41
42HYPERVISOR_ATTR_RO(type);
43
44static int __init xen_sysfs_type_init(void)
45{
46    return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
47}
48
49static void xen_sysfs_type_destroy(void)
50{
51    sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
52}
53
54/* xen version attributes */
55static 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
63HYPERVISOR_ATTR_RO(major);
64
65static 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
73HYPERVISOR_ATTR_RO(minor);
74
75static 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
91HYPERVISOR_ATTR_RO(extra);
92
93static struct attribute *version_attrs[] = {
94    &major_attr.attr,
95    &minor_attr.attr,
96    &extra_attr.attr,
97    NULL
98};
99
100static const struct attribute_group version_group = {
101    .name = "version",
102    .attrs = version_attrs,
103};
104
105static int __init xen_sysfs_version_init(void)
106{
107    return sysfs_create_group(hypervisor_kobj, &version_group);
108}
109
110static void xen_sysfs_version_destroy(void)
111{
112    sysfs_remove_group(hypervisor_kobj, &version_group);
113}
114
115/* UUID */
116
117static 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
138HYPERVISOR_ATTR_RO(uuid);
139
140static int __init xen_sysfs_uuid_init(void)
141{
142    return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
143}
144
145static void xen_sysfs_uuid_destroy(void)
146{
147    sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
148}
149
150/* xen compilation attributes */
151
152static 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
168HYPERVISOR_ATTR_RO(compiler);
169
170static 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
186HYPERVISOR_ATTR_RO(compiled_by);
187
188static 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
204HYPERVISOR_ATTR_RO(compile_date);
205
206static struct attribute *xen_compile_attrs[] = {
207    &compiler_attr.attr,
208    &compiled_by_attr.attr,
209    &compile_date_attr.attr,
210    NULL
211};
212
213static const struct attribute_group xen_compilation_group = {
214    .name = "compilation",
215    .attrs = xen_compile_attrs,
216};
217
218static int __init xen_compilation_init(void)
219{
220    return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
221}
222
223static void xen_compilation_destroy(void)
224{
225    sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
226}
227
228/* xen properties info */
229
230static 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
246HYPERVISOR_ATTR_RO(capabilities);
247
248static 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
264HYPERVISOR_ATTR_RO(changeset);
265
266static 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
283HYPERVISOR_ATTR_RO(virtual_start);
284
285static 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
296HYPERVISOR_ATTR_RO(pagesize);
297
298static 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
311static 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
332HYPERVISOR_ATTR_RO(features);
333
334static 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
343static const struct attribute_group xen_properties_group = {
344    .name = "properties",
345    .attrs = xen_properties_attrs,
346};
347
348static int __init xen_properties_init(void)
349{
350    return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
351}
352
353static void xen_properties_destroy(void)
354{
355    sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
356}
357
358static 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
383prop_out:
384    xen_sysfs_uuid_destroy();
385uuid_out:
386    xen_compilation_destroy();
387comp_out:
388    xen_sysfs_version_destroy();
389version_out:
390    xen_sysfs_type_destroy();
391out:
392    return ret;
393}
394
395static 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}
404module_init(hyper_sysfs_init);
405module_exit(hyper_sysfs_exit);
406
407static 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
418static 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
430static const struct sysfs_ops hyp_sysfs_ops = {
431    .show = hyp_sysfs_show,
432    .store = hyp_sysfs_store,
433};
434
435static struct kobj_type hyp_sysfs_kobj_type = {
436    .sysfs_ops = &hyp_sysfs_ops,
437};
438
439static 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}
447device_initcall(hypervisor_subsys_init);
448

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