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/init.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#ifdef CONFIG_XEN_HAVE_VPMU
24#include <xen/interface/xenpmu.h>
25#endif
26
27#define HYPERVISOR_ATTR_RO(_name) \
28static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
29
30#define HYPERVISOR_ATTR_RW(_name) \
31static struct hyp_sysfs_attr _name##_attr = \
32 __ATTR(_name, 0644, _name##_show, _name##_store)
33
34struct hyp_sysfs_attr {
35 struct attribute attr;
36 ssize_t (*show)(struct hyp_sysfs_attr *, char *);
37 ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
38 void *hyp_attr_data;
39};
40
41static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
42{
43 return sprintf(buffer, "xen\n");
44}
45
46HYPERVISOR_ATTR_RO(type);
47
48static int __init xen_sysfs_type_init(void)
49{
50 return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
51}
52
53static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
54{
55 const char *type;
56
57 switch (xen_domain_type) {
58 case XEN_NATIVE:
59 /* ARM only. */
60 type = "Xen";
61 break;
62 case XEN_PV_DOMAIN:
63 type = "PV";
64 break;
65 case XEN_HVM_DOMAIN:
66 type = xen_pvh_domain() ? "PVH" : "HVM";
67 break;
68 default:
69 return -EINVAL;
70 }
71
72 return sprintf(buffer, "%s\n", type);
73}
74
75HYPERVISOR_ATTR_RO(guest_type);
76
77static int __init xen_sysfs_guest_type_init(void)
78{
79 return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
80}
81
82/* xen version attributes */
83static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
84{
85 int version = HYPERVISOR_xen_version(XENVER_version, NULL);
86 if (version)
87 return sprintf(buffer, "%d\n", version >> 16);
88 return -ENODEV;
89}
90
91HYPERVISOR_ATTR_RO(major);
92
93static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
94{
95 int version = HYPERVISOR_xen_version(XENVER_version, NULL);
96 if (version)
97 return sprintf(buffer, "%d\n", version & 0xff);
98 return -ENODEV;
99}
100
101HYPERVISOR_ATTR_RO(minor);
102
103static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
104{
105 int ret = -ENOMEM;
106 char *extra;
107
108 extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
109 if (extra) {
110 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
111 if (!ret)
112 ret = sprintf(buffer, "%s\n", extra);
113 kfree(extra);
114 }
115
116 return ret;
117}
118
119HYPERVISOR_ATTR_RO(extra);
120
121static struct attribute *version_attrs[] = {
122 &major_attr.attr,
123 &minor_attr.attr,
124 &extra_attr.attr,
125 NULL
126};
127
128static const struct attribute_group version_group = {
129 .name = "version",
130 .attrs = version_attrs,
131};
132
133static int __init xen_sysfs_version_init(void)
134{
135 return sysfs_create_group(hypervisor_kobj, &version_group);
136}
137
138/* UUID */
139
140static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
141{
142 char *vm, *val;
143 int ret;
144 extern int xenstored_ready;
145
146 if (!xenstored_ready)
147 return -EBUSY;
148
149 vm = xenbus_read(XBT_NIL, "vm", "", NULL);
150 if (IS_ERR(vm))
151 return PTR_ERR(vm);
152 val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
153 kfree(vm);
154 if (IS_ERR(val))
155 return PTR_ERR(val);
156 ret = sprintf(buffer, "%s\n", val);
157 kfree(val);
158 return ret;
159}
160
161static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
162{
163 xen_domain_handle_t uuid;
164 int ret;
165 ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
166 if (ret)
167 return uuid_show_fallback(attr, buffer);
168 ret = sprintf(buffer, "%pU\n", uuid);
169 return ret;
170}
171
172HYPERVISOR_ATTR_RO(uuid);
173
174static int __init xen_sysfs_uuid_init(void)
175{
176 return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
177}
178
179/* xen compilation attributes */
180
181static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
182{
183 int ret = -ENOMEM;
184 struct xen_compile_info *info;
185
186 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
187 if (info) {
188 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
189 if (!ret)
190 ret = sprintf(buffer, "%s\n", info->compiler);
191 kfree(info);
192 }
193
194 return ret;
195}
196
197HYPERVISOR_ATTR_RO(compiler);
198
199static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
200{
201 int ret = -ENOMEM;
202 struct xen_compile_info *info;
203
204 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
205 if (info) {
206 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
207 if (!ret)
208 ret = sprintf(buffer, "%s\n", info->compile_by);
209 kfree(info);
210 }
211
212 return ret;
213}
214
215HYPERVISOR_ATTR_RO(compiled_by);
216
217static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
218{
219 int ret = -ENOMEM;
220 struct xen_compile_info *info;
221
222 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
223 if (info) {
224 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
225 if (!ret)
226 ret = sprintf(buffer, "%s\n", info->compile_date);
227 kfree(info);
228 }
229
230 return ret;
231}
232
233HYPERVISOR_ATTR_RO(compile_date);
234
235static struct attribute *xen_compile_attrs[] = {
236 &compiler_attr.attr,
237 &compiled_by_attr.attr,
238 &compile_date_attr.attr,
239 NULL
240};
241
242static const struct attribute_group xen_compilation_group = {
243 .name = "compilation",
244 .attrs = xen_compile_attrs,
245};
246
247static int __init xen_sysfs_compilation_init(void)
248{
249 return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
250}
251
252/* xen properties info */
253
254static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
255{
256 int ret = -ENOMEM;
257 char *caps;
258
259 caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
260 if (caps) {
261 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
262 if (!ret)
263 ret = sprintf(buffer, "%s\n", caps);
264 kfree(caps);
265 }
266
267 return ret;
268}
269
270HYPERVISOR_ATTR_RO(capabilities);
271
272static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
273{
274 int ret = -ENOMEM;
275 char *cset;
276
277 cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
278 if (cset) {
279 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
280 if (!ret)
281 ret = sprintf(buffer, "%s\n", cset);
282 kfree(cset);
283 }
284
285 return ret;
286}
287
288HYPERVISOR_ATTR_RO(changeset);
289
290static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
291{
292 int ret = -ENOMEM;
293 struct xen_platform_parameters *parms;
294
295 parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
296 if (parms) {
297 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
298 parms);
299 if (!ret)
300 ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
301 parms->virt_start);
302 kfree(parms);
303 }
304
305 return ret;
306}
307
308HYPERVISOR_ATTR_RO(virtual_start);
309
310static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
311{
312 int ret;
313
314 ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
315 if (ret > 0)
316 ret = sprintf(buffer, "%x\n", ret);
317
318 return ret;
319}
320
321HYPERVISOR_ATTR_RO(pagesize);
322
323static ssize_t xen_feature_show(int index, char *buffer)
324{
325 ssize_t ret;
326 struct xen_feature_info info;
327
328 info.submap_idx = index;
329 ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
330 if (!ret)
331 ret = sprintf(buffer, "%08x", info.submap);
332
333 return ret;
334}
335
336static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
337{
338 ssize_t len;
339 int i;
340
341 len = 0;
342 for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
343 int ret = xen_feature_show(i, buffer + len);
344 if (ret < 0) {
345 if (len == 0)
346 len = ret;
347 break;
348 }
349 len += ret;
350 }
351 if (len > 0)
352 buffer[len++] = '\n';
353
354 return len;
355}
356
357HYPERVISOR_ATTR_RO(features);
358
359static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer)
360{
361 ssize_t ret;
362 struct xen_build_id *buildid;
363
364 ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
365 if (ret < 0) {
366 if (ret == -EPERM)
367 ret = sprintf(buffer, "<denied>");
368 return ret;
369 }
370
371 buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
372 if (!buildid)
373 return -ENOMEM;
374
375 buildid->len = ret;
376 ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
377 if (ret > 0)
378 ret = sprintf(buffer, "%s", buildid->buf);
379 kfree(buildid);
380
381 return ret;
382}
383
384HYPERVISOR_ATTR_RO(buildid);
385
386static struct attribute *xen_properties_attrs[] = {
387 &capabilities_attr.attr,
388 &changeset_attr.attr,
389 &virtual_start_attr.attr,
390 &pagesize_attr.attr,
391 &features_attr.attr,
392 &buildid_attr.attr,
393 NULL
394};
395
396static const struct attribute_group xen_properties_group = {
397 .name = "properties",
398 .attrs = xen_properties_attrs,
399};
400
401static int __init xen_sysfs_properties_init(void)
402{
403 return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
404}
405
406#ifdef CONFIG_XEN_HAVE_VPMU
407struct pmu_mode {
408 const char *name;
409 uint32_t mode;
410};
411
412static struct pmu_mode pmu_modes[] = {
413 {"off", XENPMU_MODE_OFF},
414 {"self", XENPMU_MODE_SELF},
415 {"hv", XENPMU_MODE_HV},
416 {"all", XENPMU_MODE_ALL}
417};
418
419static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
420 const char *buffer, size_t len)
421{
422 int ret;
423 struct xen_pmu_params xp;
424 int i;
425
426 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
427 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
428 xp.val = pmu_modes[i].mode;
429 break;
430 }
431 }
432
433 if (i == ARRAY_SIZE(pmu_modes))
434 return -EINVAL;
435
436 xp.version.maj = XENPMU_VER_MAJ;
437 xp.version.min = XENPMU_VER_MIN;
438 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
439 if (ret)
440 return ret;
441
442 return len;
443}
444
445static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
446{
447 int ret;
448 struct xen_pmu_params xp;
449 int i;
450 uint32_t mode;
451
452 xp.version.maj = XENPMU_VER_MAJ;
453 xp.version.min = XENPMU_VER_MIN;
454 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
455 if (ret)
456 return ret;
457
458 mode = (uint32_t)xp.val;
459 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
460 if (mode == pmu_modes[i].mode)
461 return sprintf(buffer, "%s\n", pmu_modes[i].name);
462 }
463
464 return -EINVAL;
465}
466HYPERVISOR_ATTR_RW(pmu_mode);
467
468static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
469 const char *buffer, size_t len)
470{
471 int ret;
472 uint32_t features;
473 struct xen_pmu_params xp;
474
475 ret = kstrtou32(buffer, 0, &features);
476 if (ret)
477 return ret;
478
479 xp.val = features;
480 xp.version.maj = XENPMU_VER_MAJ;
481 xp.version.min = XENPMU_VER_MIN;
482 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
483 if (ret)
484 return ret;
485
486 return len;
487}
488
489static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
490{
491 int ret;
492 struct xen_pmu_params xp;
493
494 xp.version.maj = XENPMU_VER_MAJ;
495 xp.version.min = XENPMU_VER_MIN;
496 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
497 if (ret)
498 return ret;
499
500 return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
501}
502HYPERVISOR_ATTR_RW(pmu_features);
503
504static struct attribute *xen_pmu_attrs[] = {
505 &pmu_mode_attr.attr,
506 &pmu_features_attr.attr,
507 NULL
508};
509
510static const struct attribute_group xen_pmu_group = {
511 .name = "pmu",
512 .attrs = xen_pmu_attrs,
513};
514
515static int __init xen_sysfs_pmu_init(void)
516{
517 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
518}
519#endif
520
521static int __init hyper_sysfs_init(void)
522{
523 int ret;
524
525 if (!xen_domain())
526 return -ENODEV;
527
528 ret = xen_sysfs_type_init();
529 if (ret)
530 goto out;
531 ret = xen_sysfs_guest_type_init();
532 if (ret)
533 goto guest_type_out;
534 ret = xen_sysfs_version_init();
535 if (ret)
536 goto version_out;
537 ret = xen_sysfs_compilation_init();
538 if (ret)
539 goto comp_out;
540 ret = xen_sysfs_uuid_init();
541 if (ret)
542 goto uuid_out;
543 ret = xen_sysfs_properties_init();
544 if (ret)
545 goto prop_out;
546#ifdef CONFIG_XEN_HAVE_VPMU
547 if (xen_initial_domain()) {
548 ret = xen_sysfs_pmu_init();
549 if (ret) {
550 sysfs_remove_group(hypervisor_kobj,
551 &xen_properties_group);
552 goto prop_out;
553 }
554 }
555#endif
556 goto out;
557
558prop_out:
559 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
560uuid_out:
561 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
562comp_out:
563 sysfs_remove_group(hypervisor_kobj, &version_group);
564version_out:
565 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
566guest_type_out:
567 sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
568out:
569 return ret;
570}
571device_initcall(hyper_sysfs_init);
572
573static ssize_t hyp_sysfs_show(struct kobject *kobj,
574 struct attribute *attr,
575 char *buffer)
576{
577 struct hyp_sysfs_attr *hyp_attr;
578 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
579 if (hyp_attr->show)
580 return hyp_attr->show(hyp_attr, buffer);
581 return 0;
582}
583
584static ssize_t hyp_sysfs_store(struct kobject *kobj,
585 struct attribute *attr,
586 const char *buffer,
587 size_t len)
588{
589 struct hyp_sysfs_attr *hyp_attr;
590 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
591 if (hyp_attr->store)
592 return hyp_attr->store(hyp_attr, buffer, len);
593 return 0;
594}
595
596static const struct sysfs_ops hyp_sysfs_ops = {
597 .show = hyp_sysfs_show,
598 .store = hyp_sysfs_store,
599};
600
601static struct kobj_type hyp_sysfs_kobj_type = {
602 .sysfs_ops = &hyp_sysfs_ops,
603};
604
605static int __init hypervisor_subsys_init(void)
606{
607 if (!xen_domain())
608 return -ENODEV;
609
610 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
611 return 0;
612}
613device_initcall(hypervisor_subsys_init);
614