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linux/drivers/xen/sys-hypervisor.c
Boris Ostrovsky 5f14154882 xen/PMU: Sysfs interface for setting Xen PMU mode 
Set Xen's PMU mode via /sys/hypervisor/pmu/pmu_mode. Add XENPMU hypercall.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
2015-08-20 12:24:26 +01:00

595 lines
12 KiB
C
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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/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>
#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);
}
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);
}
#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);
}
static void xen_pmu_destroy(void)
{
sysfs_remove_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) {
xen_properties_destroy();
goto prop_out;
}
}
#endif
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)
{
#ifdef CONFIG_XEN_HAVE_VPMU
xen_pmu_destroy();
#endif
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);
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