1 // SPDX-License-Identifier: GPL-2.0
3 * Hypervisor filesystem for Linux on s390.
4 * Set Partition-Resource Parameter interface.
6 * Copyright IBM Corp. 2013
7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
10 #include <linux/compat.h>
11 #include <linux/errno.h>
12 #include <linux/gfp.h>
13 #include <linux/string.h>
14 #include <linux/types.h>
15 #include <linux/uaccess.h>
16 #include <asm/compat.h>
21 #define DIAG304_SET_WEIGHTS 0
22 #define DIAG304_QUERY_PRP 1
23 #define DIAG304_SET_CAPPING 2
25 #define DIAG304_CMD_MAX 2
27 static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
29 register unsigned long _data asm("2") = (unsigned long) data;
30 register unsigned long _rc asm("3");
31 register unsigned long _cmd asm("4") = cmd;
33 asm volatile("diag %1,%2,0x304\n"
34 : "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory");
39 static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
41 diag_stat_inc(DIAG_STAT_X304);
42 return __hypfs_sprp_diag304(data, cmd);
45 static void hypfs_sprp_free(const void *data)
47 free_page((unsigned long) data);
50 static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
55 data = (void *) get_zeroed_page(GFP_KERNEL);
58 rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
60 *data_ptr = *free_ptr = NULL;
62 free_page((unsigned long) data);
65 *data_ptr = *free_ptr = data;
70 static int __hypfs_sprp_ioctl(void __user *user_area)
72 struct hypfs_diag304 diag304;
78 if (copy_from_user(&diag304, user_area, sizeof(diag304)))
80 if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX)
83 data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
87 udata = (void __user *)(unsigned long) diag304.data;
88 if (diag304.args[1] == DIAG304_SET_WEIGHTS ||
89 diag304.args[1] == DIAG304_SET_CAPPING)
90 if (copy_from_user(data, udata, PAGE_SIZE)) {
95 cmd = *(unsigned long *) &diag304.args[0];
96 diag304.rc = hypfs_sprp_diag304(data, cmd);
98 if (diag304.args[1] == DIAG304_QUERY_PRP)
99 if (copy_to_user(udata, data, PAGE_SIZE)) {
104 rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0;
106 free_page((unsigned long) data);
110 static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
115 if (!capable(CAP_SYS_ADMIN))
117 if (is_compat_task())
118 argp = compat_ptr(arg);
120 argp = (void __user *) arg;
123 return __hypfs_sprp_ioctl(argp);
124 default: /* unknown ioctl number */
130 static struct hypfs_dbfs_file hypfs_sprp_file = {
132 .data_create = hypfs_sprp_create,
133 .data_free = hypfs_sprp_free,
134 .unlocked_ioctl = hypfs_sprp_ioctl,
137 int hypfs_sprp_init(void)
141 return hypfs_dbfs_create_file(&hypfs_sprp_file);
144 void hypfs_sprp_exit(void)
148 hypfs_dbfs_remove_file(&hypfs_sprp_file);