mirror of https://gitee.com/openkylin/linux.git
153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Hypervisor filesystem for Linux on s390.
|
|
* Set Partition-Resource Parameter interface.
|
|
*
|
|
* Copyright IBM Corp. 2013
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/diag.h>
|
|
#include <asm/sclp.h>
|
|
#include "hypfs.h"
|
|
|
|
#define DIAG304_SET_WEIGHTS 0
|
|
#define DIAG304_QUERY_PRP 1
|
|
#define DIAG304_SET_CAPPING 2
|
|
|
|
#define DIAG304_CMD_MAX 2
|
|
|
|
static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
|
|
{
|
|
register unsigned long _data asm("2") = (unsigned long) data;
|
|
register unsigned long _rc asm("3");
|
|
register unsigned long _cmd asm("4") = cmd;
|
|
|
|
asm volatile("diag %1,%2,0x304\n"
|
|
: "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory");
|
|
|
|
return _rc;
|
|
}
|
|
|
|
static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
|
|
{
|
|
diag_stat_inc(DIAG_STAT_X304);
|
|
return __hypfs_sprp_diag304(data, cmd);
|
|
}
|
|
|
|
static void hypfs_sprp_free(const void *data)
|
|
{
|
|
free_page((unsigned long) data);
|
|
}
|
|
|
|
static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
|
|
{
|
|
unsigned long rc;
|
|
void *data;
|
|
|
|
data = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
|
|
if (rc != 1) {
|
|
*data_ptr = *free_ptr = NULL;
|
|
*size = 0;
|
|
free_page((unsigned long) data);
|
|
return -EIO;
|
|
}
|
|
*data_ptr = *free_ptr = data;
|
|
*size = PAGE_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
static int __hypfs_sprp_ioctl(void __user *user_area)
|
|
{
|
|
struct hypfs_diag304 *diag304;
|
|
unsigned long cmd;
|
|
void __user *udata;
|
|
void *data;
|
|
int rc;
|
|
|
|
rc = -ENOMEM;
|
|
data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL);
|
|
if (!data || !diag304)
|
|
goto out;
|
|
|
|
rc = -EFAULT;
|
|
if (copy_from_user(diag304, user_area, sizeof(*diag304)))
|
|
goto out;
|
|
rc = -EINVAL;
|
|
if ((diag304->args[0] >> 8) != 0 || diag304->args[1] > DIAG304_CMD_MAX)
|
|
goto out;
|
|
|
|
rc = -EFAULT;
|
|
udata = (void __user *)(unsigned long) diag304->data;
|
|
if (diag304->args[1] == DIAG304_SET_WEIGHTS ||
|
|
diag304->args[1] == DIAG304_SET_CAPPING)
|
|
if (copy_from_user(data, udata, PAGE_SIZE))
|
|
goto out;
|
|
|
|
cmd = *(unsigned long *) &diag304->args[0];
|
|
diag304->rc = hypfs_sprp_diag304(data, cmd);
|
|
|
|
if (diag304->args[1] == DIAG304_QUERY_PRP)
|
|
if (copy_to_user(udata, data, PAGE_SIZE)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0;
|
|
out:
|
|
kfree(diag304);
|
|
free_page((unsigned long) data);
|
|
return rc;
|
|
}
|
|
|
|
static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
if (is_compat_task())
|
|
argp = compat_ptr(arg);
|
|
else
|
|
argp = (void __user *) arg;
|
|
switch (cmd) {
|
|
case HYPFS_DIAG304:
|
|
return __hypfs_sprp_ioctl(argp);
|
|
default: /* unknown ioctl number */
|
|
return -ENOTTY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct hypfs_dbfs_file hypfs_sprp_file = {
|
|
.name = "diag_304",
|
|
.data_create = hypfs_sprp_create,
|
|
.data_free = hypfs_sprp_free,
|
|
.unlocked_ioctl = hypfs_sprp_ioctl,
|
|
};
|
|
|
|
void hypfs_sprp_init(void)
|
|
{
|
|
if (!sclp.has_sprp)
|
|
return;
|
|
hypfs_dbfs_create_file(&hypfs_sprp_file);
|
|
}
|
|
|
|
void hypfs_sprp_exit(void)
|
|
{
|
|
if (!sclp.has_sprp)
|
|
return;
|
|
hypfs_dbfs_remove_file(&hypfs_sprp_file);
|
|
}
|