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linux/drivers/xen/sys-hypervisor.c
Paul Gortmaker 46894f17af drivers/xen: make sys-hypervisor.c explicitly non-modular 
The Kconfig currently controlling compilation of this code is:

config XEN_SYS_HYPERVISOR
       bool "Create xen entries under /sys/hypervisor"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.  However
one could argue that fs_initcall() might make more sense here.

This change means that the one line function xen_properties_destroy()
has only one user left, and since that is inside an #ifdef, we just
manually inline it there vs. adding more ifdeffery around the function
to avoid compile warnings about "defined but not used".

In order to be consistent we also manually inline the other _destroy
functions that are also just one line sysfs functions calls with only
one call site remaing, even though they wouldn't need #ifdeffery.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
2016-03-21 15:14:03 +00:00

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/*
* 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/init.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>
#ifdef CONFIG_XEN_HAVE_VPMU
#include <xen/interface/xenpmu.h>
#endif
#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);
}
/* 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);
}
/* 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);
}
/* 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);
}
/* 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);
}
#ifdef CONFIG_XEN_HAVE_VPMU
struct pmu_mode {
const char *name;
uint32_t mode;
};
static struct pmu_mode pmu_modes[] = {
{"off", XENPMU_MODE_OFF},
{"self", XENPMU_MODE_SELF},
{"hv", XENPMU_MODE_HV},
{"all", XENPMU_MODE_ALL}
};
static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
const char *buffer, size_t len)
{
int ret;
struct xen_pmu_params xp;
int i;
for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
xp.val = pmu_modes[i].mode;
break;
}
}
if (i == ARRAY_SIZE(pmu_modes))
return -EINVAL;
xp.version.maj = XENPMU_VER_MAJ;
xp.version.min = XENPMU_VER_MIN;
ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
if (ret)
return ret;
return len;
}
static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret;
struct xen_pmu_params xp;
int i;
uint32_t mode;
xp.version.maj = XENPMU_VER_MAJ;
xp.version.min = XENPMU_VER_MIN;
ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
if (ret)
return ret;
mode = (uint32_t)xp.val;
for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
if (mode == pmu_modes[i].mode)
return sprintf(buffer, "%s\n", pmu_modes[i].name);
}
return -EINVAL;
}
HYPERVISOR_ATTR_RW(pmu_mode);
static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
const char *buffer, size_t len)
{
int ret;
uint32_t features;
struct xen_pmu_params xp;
ret = kstrtou32(buffer, 0, &features);
if (ret)
return ret;
xp.val = features;
xp.version.maj = XENPMU_VER_MAJ;
xp.version.min = XENPMU_VER_MIN;
ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
if (ret)
return ret;
return len;
}
static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret;
struct xen_pmu_params xp;
xp.version.maj = XENPMU_VER_MAJ;
xp.version.min = XENPMU_VER_MIN;
ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
if (ret)
return ret;
return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
}
HYPERVISOR_ATTR_RW(pmu_features);
static struct attribute *xen_pmu_attrs[] = {
&pmu_mode_attr.attr,
&pmu_features_attr.attr,
NULL
};
static const struct attribute_group xen_pmu_group = {
.name = "pmu",
.attrs = xen_pmu_attrs,
};
static int __init xen_pmu_init(void)
{
return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
}
#endif
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;
#ifdef CONFIG_XEN_HAVE_VPMU
if (xen_initial_domain()) {
ret = xen_pmu_init();
if (ret) {
sysfs_remove_group(hypervisor_kobj,
&xen_properties_group);
goto prop_out;
}
}
#endif
goto out;
prop_out:
sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
uuid_out:
sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
comp_out:
sysfs_remove_group(hypervisor_kobj, &version_group);
version_out:
sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
out:
return ret;
}
device_initcall(hyper_sysfs_init);
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);
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