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610 lines
12 KiB
610 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* copyright (c) 2006 IBM Corporation |
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* Authored by: Mike D. Day <[email protected]> |
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*/ |
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#include <linux/slab.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/kobject.h> |
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#include <linux/err.h> |
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#include <asm/xen/hypervisor.h> |
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#include <asm/xen/hypercall.h> |
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#include <xen/xen.h> |
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#include <xen/xenbus.h> |
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#include <xen/interface/xen.h> |
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#include <xen/interface/version.h> |
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#ifdef CONFIG_XEN_HAVE_VPMU |
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#include <xen/interface/xenpmu.h> |
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#endif |
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#define HYPERVISOR_ATTR_RO(_name) \ |
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static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name) |
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#define HYPERVISOR_ATTR_RW(_name) \ |
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static struct hyp_sysfs_attr _name##_attr = \ |
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__ATTR(_name, 0644, _name##_show, _name##_store) |
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struct hyp_sysfs_attr { |
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struct attribute attr; |
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ssize_t (*show)(struct hyp_sysfs_attr *, char *); |
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ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t); |
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void *hyp_attr_data; |
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}; |
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static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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return sprintf(buffer, "xen\n"); |
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} |
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HYPERVISOR_ATTR_RO(type); |
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static int __init xen_sysfs_type_init(void) |
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{ |
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return sysfs_create_file(hypervisor_kobj, &type_attr.attr); |
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} |
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static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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const char *type; |
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switch (xen_domain_type) { |
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case XEN_NATIVE: |
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/* ARM only. */ |
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type = "Xen"; |
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break; |
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case XEN_PV_DOMAIN: |
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type = "PV"; |
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break; |
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case XEN_HVM_DOMAIN: |
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type = xen_pvh_domain() ? "PVH" : "HVM"; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return sprintf(buffer, "%s\n", type); |
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} |
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HYPERVISOR_ATTR_RO(guest_type); |
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static int __init xen_sysfs_guest_type_init(void) |
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{ |
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return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr); |
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} |
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/* xen version attributes */ |
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static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int version = HYPERVISOR_xen_version(XENVER_version, NULL); |
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if (version) |
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return sprintf(buffer, "%d\n", version >> 16); |
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return -ENODEV; |
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} |
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HYPERVISOR_ATTR_RO(major); |
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static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int version = HYPERVISOR_xen_version(XENVER_version, NULL); |
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if (version) |
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return sprintf(buffer, "%d\n", version & 0xff); |
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return -ENODEV; |
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} |
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HYPERVISOR_ATTR_RO(minor); |
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static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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char *extra; |
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extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL); |
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if (extra) { |
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ret = HYPERVISOR_xen_version(XENVER_extraversion, extra); |
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if (!ret) |
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ret = sprintf(buffer, "%s\n", extra); |
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kfree(extra); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(extra); |
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static struct attribute *version_attrs[] = { |
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&major_attr.attr, |
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&minor_attr.attr, |
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&extra_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group version_group = { |
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.name = "version", |
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.attrs = version_attrs, |
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}; |
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static int __init xen_sysfs_version_init(void) |
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{ |
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return sysfs_create_group(hypervisor_kobj, &version_group); |
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} |
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/* UUID */ |
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static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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char *vm, *val; |
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int ret; |
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extern int xenstored_ready; |
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if (!xenstored_ready) |
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return -EBUSY; |
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vm = xenbus_read(XBT_NIL, "vm", "", NULL); |
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if (IS_ERR(vm)) |
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return PTR_ERR(vm); |
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val = xenbus_read(XBT_NIL, vm, "uuid", NULL); |
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kfree(vm); |
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if (IS_ERR(val)) |
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return PTR_ERR(val); |
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ret = sprintf(buffer, "%s\n", val); |
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kfree(val); |
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return ret; |
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} |
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static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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xen_domain_handle_t uuid; |
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int ret; |
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ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid); |
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if (ret) |
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return uuid_show_fallback(attr, buffer); |
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ret = sprintf(buffer, "%pU\n", uuid); |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(uuid); |
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static int __init xen_sysfs_uuid_init(void) |
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{ |
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return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr); |
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} |
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/* xen compilation attributes */ |
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static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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struct xen_compile_info *info; |
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info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); |
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if (info) { |
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ret = HYPERVISOR_xen_version(XENVER_compile_info, info); |
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if (!ret) |
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ret = sprintf(buffer, "%s\n", info->compiler); |
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kfree(info); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(compiler); |
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static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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struct xen_compile_info *info; |
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info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); |
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if (info) { |
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ret = HYPERVISOR_xen_version(XENVER_compile_info, info); |
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if (!ret) |
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ret = sprintf(buffer, "%s\n", info->compile_by); |
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kfree(info); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(compiled_by); |
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static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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struct xen_compile_info *info; |
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info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); |
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if (info) { |
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ret = HYPERVISOR_xen_version(XENVER_compile_info, info); |
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if (!ret) |
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ret = sprintf(buffer, "%s\n", info->compile_date); |
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kfree(info); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(compile_date); |
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static struct attribute *xen_compile_attrs[] = { |
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&compiler_attr.attr, |
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&compiled_by_attr.attr, |
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&compile_date_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group xen_compilation_group = { |
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.name = "compilation", |
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.attrs = xen_compile_attrs, |
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}; |
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static int __init xen_sysfs_compilation_init(void) |
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{ |
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return sysfs_create_group(hypervisor_kobj, &xen_compilation_group); |
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} |
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/* xen properties info */ |
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static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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char *caps; |
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caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL); |
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if (caps) { |
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ret = HYPERVISOR_xen_version(XENVER_capabilities, caps); |
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if (!ret) |
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ret = sprintf(buffer, "%s\n", caps); |
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kfree(caps); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(capabilities); |
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static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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char *cset; |
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cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL); |
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if (cset) { |
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ret = HYPERVISOR_xen_version(XENVER_changeset, cset); |
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if (!ret) |
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ret = sprintf(buffer, "%s\n", cset); |
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kfree(cset); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(changeset); |
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static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret = -ENOMEM; |
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struct xen_platform_parameters *parms; |
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parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL); |
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if (parms) { |
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ret = HYPERVISOR_xen_version(XENVER_platform_parameters, |
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parms); |
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if (!ret) |
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ret = sprintf(buffer, "%"PRI_xen_ulong"\n", |
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parms->virt_start); |
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kfree(parms); |
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} |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(virtual_start); |
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static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret; |
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ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL); |
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if (ret > 0) |
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ret = sprintf(buffer, "%x\n", ret); |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(pagesize); |
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static ssize_t xen_feature_show(int index, char *buffer) |
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{ |
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ssize_t ret; |
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struct xen_feature_info info; |
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info.submap_idx = index; |
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ret = HYPERVISOR_xen_version(XENVER_get_features, &info); |
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if (!ret) |
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ret = sprintf(buffer, "%08x", info.submap); |
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return ret; |
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} |
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static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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ssize_t len; |
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int i; |
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len = 0; |
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for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) { |
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int ret = xen_feature_show(i, buffer + len); |
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if (ret < 0) { |
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if (len == 0) |
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len = ret; |
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break; |
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} |
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len += ret; |
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} |
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if (len > 0) |
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buffer[len++] = '\n'; |
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return len; |
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} |
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HYPERVISOR_ATTR_RO(features); |
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static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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ssize_t ret; |
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struct xen_build_id *buildid; |
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ret = HYPERVISOR_xen_version(XENVER_build_id, NULL); |
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if (ret < 0) { |
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if (ret == -EPERM) |
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ret = sprintf(buffer, "<denied>"); |
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return ret; |
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} |
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buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL); |
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if (!buildid) |
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return -ENOMEM; |
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buildid->len = ret; |
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ret = HYPERVISOR_xen_version(XENVER_build_id, buildid); |
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if (ret > 0) |
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ret = sprintf(buffer, "%s", buildid->buf); |
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kfree(buildid); |
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return ret; |
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} |
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HYPERVISOR_ATTR_RO(buildid); |
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static struct attribute *xen_properties_attrs[] = { |
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&capabilities_attr.attr, |
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&changeset_attr.attr, |
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&virtual_start_attr.attr, |
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&pagesize_attr.attr, |
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&features_attr.attr, |
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&buildid_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group xen_properties_group = { |
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.name = "properties", |
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.attrs = xen_properties_attrs, |
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}; |
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static int __init xen_sysfs_properties_init(void) |
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{ |
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return sysfs_create_group(hypervisor_kobj, &xen_properties_group); |
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} |
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#ifdef CONFIG_XEN_HAVE_VPMU |
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struct pmu_mode { |
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const char *name; |
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uint32_t mode; |
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}; |
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static struct pmu_mode pmu_modes[] = { |
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{"off", XENPMU_MODE_OFF}, |
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{"self", XENPMU_MODE_SELF}, |
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{"hv", XENPMU_MODE_HV}, |
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{"all", XENPMU_MODE_ALL} |
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}; |
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static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr, |
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const char *buffer, size_t len) |
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{ |
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int ret; |
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struct xen_pmu_params xp; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { |
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if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) { |
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xp.val = pmu_modes[i].mode; |
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break; |
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} |
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} |
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if (i == ARRAY_SIZE(pmu_modes)) |
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return -EINVAL; |
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xp.version.maj = XENPMU_VER_MAJ; |
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xp.version.min = XENPMU_VER_MIN; |
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ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp); |
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if (ret) |
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return ret; |
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return len; |
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} |
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static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret; |
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struct xen_pmu_params xp; |
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int i; |
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uint32_t mode; |
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xp.version.maj = XENPMU_VER_MAJ; |
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xp.version.min = XENPMU_VER_MIN; |
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ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp); |
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if (ret) |
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return ret; |
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mode = (uint32_t)xp.val; |
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for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { |
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if (mode == pmu_modes[i].mode) |
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return sprintf(buffer, "%s\n", pmu_modes[i].name); |
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} |
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return -EINVAL; |
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} |
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HYPERVISOR_ATTR_RW(pmu_mode); |
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static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr, |
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const char *buffer, size_t len) |
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{ |
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int ret; |
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uint32_t features; |
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struct xen_pmu_params xp; |
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ret = kstrtou32(buffer, 0, &features); |
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if (ret) |
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return ret; |
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xp.val = features; |
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xp.version.maj = XENPMU_VER_MAJ; |
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xp.version.min = XENPMU_VER_MIN; |
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ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp); |
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if (ret) |
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return ret; |
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return len; |
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} |
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static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer) |
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{ |
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int ret; |
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struct xen_pmu_params xp; |
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xp.version.maj = XENPMU_VER_MAJ; |
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xp.version.min = XENPMU_VER_MIN; |
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ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp); |
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if (ret) |
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return ret; |
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return sprintf(buffer, "0x%x\n", (uint32_t)xp.val); |
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} |
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HYPERVISOR_ATTR_RW(pmu_features); |
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static struct attribute *xen_pmu_attrs[] = { |
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&pmu_mode_attr.attr, |
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&pmu_features_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group xen_pmu_group = { |
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.name = "pmu", |
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.attrs = xen_pmu_attrs, |
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}; |
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static int __init xen_sysfs_pmu_init(void) |
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{ |
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return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); |
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} |
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#endif |
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static int __init hyper_sysfs_init(void) |
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{ |
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int ret; |
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if (!xen_domain()) |
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return -ENODEV; |
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ret = xen_sysfs_type_init(); |
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if (ret) |
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goto out; |
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ret = xen_sysfs_guest_type_init(); |
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if (ret) |
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goto guest_type_out; |
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ret = xen_sysfs_version_init(); |
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if (ret) |
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goto version_out; |
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ret = xen_sysfs_compilation_init(); |
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if (ret) |
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goto comp_out; |
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ret = xen_sysfs_uuid_init(); |
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if (ret) |
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goto uuid_out; |
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ret = xen_sysfs_properties_init(); |
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if (ret) |
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goto prop_out; |
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#ifdef CONFIG_XEN_HAVE_VPMU |
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if (xen_initial_domain()) { |
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ret = xen_sysfs_pmu_init(); |
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if (ret) { |
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sysfs_remove_group(hypervisor_kobj, |
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&xen_properties_group); |
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goto prop_out; |
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} |
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} |
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#endif |
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goto out; |
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prop_out: |
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sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); |
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uuid_out: |
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sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); |
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comp_out: |
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sysfs_remove_group(hypervisor_kobj, &version_group); |
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version_out: |
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sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); |
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guest_type_out: |
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sysfs_remove_file(hypervisor_kobj, &type_attr.attr); |
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out: |
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return ret; |
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} |
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device_initcall(hyper_sysfs_init); |
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static ssize_t hyp_sysfs_show(struct kobject *kobj, |
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struct attribute *attr, |
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char *buffer) |
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{ |
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struct hyp_sysfs_attr *hyp_attr; |
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hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); |
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if (hyp_attr->show) |
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return hyp_attr->show(hyp_attr, buffer); |
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return 0; |
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} |
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static ssize_t hyp_sysfs_store(struct kobject *kobj, |
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struct attribute *attr, |
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const char *buffer, |
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size_t len) |
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{ |
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struct hyp_sysfs_attr *hyp_attr; |
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hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); |
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if (hyp_attr->store) |
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return hyp_attr->store(hyp_attr, buffer, len); |
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return 0; |
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} |
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static const struct sysfs_ops hyp_sysfs_ops = { |
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.show = hyp_sysfs_show, |
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.store = hyp_sysfs_store, |
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}; |
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static struct kobj_type hyp_sysfs_kobj_type = { |
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.sysfs_ops = &hyp_sysfs_ops, |
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}; |
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static int __init hypervisor_subsys_init(void) |
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{ |
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if (!xen_domain()) |
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return -ENODEV; |
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hypervisor_kobj->ktype = &hyp_sysfs_kobj_type; |
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return 0; |
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} |
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device_initcall(hypervisor_subsys_init);
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