/* *  copyright (c) 2006 IBM Corporation *  Authored by: Mike D. Day <ncmike@us.ibm.com> * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License version 2 as *  published by the Free Software Foundation. */ #include <linux/slab.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/kobject.h>#include <linux/err.h> #include <asm/xen/hypervisor.h>#include <asm/xen/hypercall.h> #include <xen/xen.h>#include <xen/xenbus.h>#include <xen/interface/xen.h>#include <xen/interface/version.h> #define HYPERVISOR_ATTR_RO(_name) \static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name) #define HYPERVISOR_ATTR_RW(_name) \static struct hyp_sysfs_attr _name##_attr = \	__ATTR(_name, 0644, _name##_show, _name##_store) struct hyp_sysfs_attr {	struct attribute attr;	ssize_t (*show)(struct hyp_sysfs_attr *, char *);	ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);	void *hyp_attr_data;}; static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer){	return sprintf(buffer, "xen\n");} HYPERVISOR_ATTR_RO(type); static int __init xen_sysfs_type_init(void){	return sysfs_create_file(hypervisor_kobj, &type_attr.attr);} static void xen_sysfs_type_destroy(void){	sysfs_remove_file(hypervisor_kobj, &type_attr.attr);} /* xen version attributes */static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer){	int version = HYPERVISOR_xen_version(XENVER_version, NULL);	if (version)		return sprintf(buffer, "%d\n", version >> 16);	return -ENODEV;} HYPERVISOR_ATTR_RO(major); static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer){	int version = HYPERVISOR_xen_version(XENVER_version, NULL);	if (version)		return sprintf(buffer, "%d\n", version & 0xff);	return -ENODEV;} HYPERVISOR_ATTR_RO(minor); static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	char *extra; 	extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);	if (extra) {		ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);		if (!ret)			ret = sprintf(buffer, "%s\n", extra);		kfree(extra);	} 	return ret;} HYPERVISOR_ATTR_RO(extra); static struct attribute *version_attrs[] = {	&major_attr.attr,	&minor_attr.attr,	&extra_attr.attr,	NULL}; static const struct attribute_group version_group = {	.name = "version",	.attrs = version_attrs,}; static int __init xen_sysfs_version_init(void){	return sysfs_create_group(hypervisor_kobj, &version_group);} static void xen_sysfs_version_destroy(void){	sysfs_remove_group(hypervisor_kobj, &version_group);} /* UUID */ static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer){	char *vm, *val;	int ret;	extern int xenstored_ready; 	if (!xenstored_ready)		return -EBUSY; 	vm = xenbus_read(XBT_NIL, "vm", "", NULL);	if (IS_ERR(vm))		return PTR_ERR(vm);	val = xenbus_read(XBT_NIL, vm, "uuid", NULL);	kfree(vm);	if (IS_ERR(val))		return PTR_ERR(val);	ret = sprintf(buffer, "%s\n", val);	kfree(val);	return ret;} static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer){	xen_domain_handle_t uuid;	int ret;	ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);	if (ret)		return uuid_show_fallback(attr, buffer);	ret = sprintf(buffer, "%pU\n", uuid);	return ret;} HYPERVISOR_ATTR_RO(uuid); static int __init xen_sysfs_uuid_init(void){	return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);} static void xen_sysfs_uuid_destroy(void){	sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);} /* xen compilation attributes */ static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	struct xen_compile_info *info; 	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);	if (info) {		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);		if (!ret)			ret = sprintf(buffer, "%s\n", info->compiler);		kfree(info);	} 	return ret;} HYPERVISOR_ATTR_RO(compiler); static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	struct xen_compile_info *info; 	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);	if (info) {		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);		if (!ret)			ret = sprintf(buffer, "%s\n", info->compile_by);		kfree(info);	} 	return ret;} HYPERVISOR_ATTR_RO(compiled_by); static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	struct xen_compile_info *info; 	info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);	if (info) {		ret = HYPERVISOR_xen_version(XENVER_compile_info, info);		if (!ret)			ret = sprintf(buffer, "%s\n", info->compile_date);		kfree(info);	} 	return ret;} HYPERVISOR_ATTR_RO(compile_date); static struct attribute *xen_compile_attrs[] = {	&compiler_attr.attr,	&compiled_by_attr.attr,	&compile_date_attr.attr,	NULL}; static const struct attribute_group xen_compilation_group = {	.name = "compilation",	.attrs = xen_compile_attrs,}; static int __init xen_compilation_init(void){	return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);} static void xen_compilation_destroy(void){	sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);} /* xen properties info */ static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	char *caps; 	caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);	if (caps) {		ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);		if (!ret)			ret = sprintf(buffer, "%s\n", caps);		kfree(caps);	} 	return ret;} HYPERVISOR_ATTR_RO(capabilities); static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	char *cset; 	cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);	if (cset) {		ret = HYPERVISOR_xen_version(XENVER_changeset, cset);		if (!ret)			ret = sprintf(buffer, "%s\n", cset);		kfree(cset);	} 	return ret;} HYPERVISOR_ATTR_RO(changeset); static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret = -ENOMEM;	struct xen_platform_parameters *parms; 	parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);	if (parms) {		ret = HYPERVISOR_xen_version(XENVER_platform_parameters,					     parms);		if (!ret)			ret = sprintf(buffer, "%"PRI_xen_ulong"\n",				      parms->virt_start);		kfree(parms);	} 	return ret;} HYPERVISOR_ATTR_RO(virtual_start); static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer){	int ret; 	ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);	if (ret > 0)		ret = sprintf(buffer, "%x\n", ret); 	return ret;} HYPERVISOR_ATTR_RO(pagesize); static ssize_t xen_feature_show(int index, char *buffer){	ssize_t ret;	struct xen_feature_info info; 	info.submap_idx = index;	ret = HYPERVISOR_xen_version(XENVER_get_features, &info);	if (!ret)		ret = sprintf(buffer, "%08x", info.submap); 	return ret;} static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer){	ssize_t len;	int i; 	len = 0;	for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {		int ret = xen_feature_show(i, buffer + len);		if (ret < 0) {			if (len == 0)				len = ret;			break;		}		len += ret;	}	if (len > 0)		buffer[len++] = '\n'; 	return len;} HYPERVISOR_ATTR_RO(features); static struct attribute *xen_properties_attrs[] = {	&capabilities_attr.attr,	&changeset_attr.attr,	&virtual_start_attr.attr,	&pagesize_attr.attr,	&features_attr.attr,	NULL}; static const struct attribute_group xen_properties_group = {	.name = "properties",	.attrs = xen_properties_attrs,}; static int __init xen_properties_init(void){	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);} static void xen_properties_destroy(void){	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);} static int __init hyper_sysfs_init(void){	int ret; 	if (!xen_domain())		return -ENODEV; 	ret = xen_sysfs_type_init();	if (ret)		goto out;	ret = xen_sysfs_version_init();	if (ret)		goto version_out;	ret = xen_compilation_init();	if (ret)		goto comp_out;	ret = xen_sysfs_uuid_init();	if (ret)		goto uuid_out;	ret = xen_properties_init();	if (ret)		goto prop_out; 	goto out; prop_out:	xen_sysfs_uuid_destroy();uuid_out:	xen_compilation_destroy();comp_out:	xen_sysfs_version_destroy();version_out:	xen_sysfs_type_destroy();out:	return ret;} static void __exit hyper_sysfs_exit(void){	xen_properties_destroy();	xen_compilation_destroy();	xen_sysfs_uuid_destroy();	xen_sysfs_version_destroy();	xen_sysfs_type_destroy(); }module_init(hyper_sysfs_init);module_exit(hyper_sysfs_exit); static ssize_t hyp_sysfs_show(struct kobject *kobj,			      struct attribute *attr,			      char *buffer){	struct hyp_sysfs_attr *hyp_attr;	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);	if (hyp_attr->show)		return hyp_attr->show(hyp_attr, buffer);	return 0;} static ssize_t hyp_sysfs_store(struct kobject *kobj,			       struct attribute *attr,			       const char *buffer,			       size_t len){	struct hyp_sysfs_attr *hyp_attr;	hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);	if (hyp_attr->store)		return hyp_attr->store(hyp_attr, buffer, len);	return 0;} static const struct sysfs_ops hyp_sysfs_ops = {	.show = hyp_sysfs_show,	.store = hyp_sysfs_store,}; static struct kobj_type hyp_sysfs_kobj_type = {	.sysfs_ops = &hyp_sysfs_ops,}; static int __init hypervisor_subsys_init(void){	if (!xen_domain())		return -ENODEV; 	hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;	return 0;}device_initcall(hypervisor_subsys_init);