Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Hypervisor filesystem for Linux on s390.
4 * Set Partition-Resource Parameter interface.
5 *
6 * Copyright IBM Corp. 2013
7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
8 */
9
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/diag.h>
17#include <asm/sclp.h>
18#include "hypfs.h"
19
20#define DIAG304_SET_WEIGHTS 0
21#define DIAG304_QUERY_PRP 1
22#define DIAG304_SET_CAPPING 2
23
24#define DIAG304_CMD_MAX 2
25
26static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
27{
28 union register_pair r1 = { .even = (unsigned long)data, };
29
30 asm volatile("diag %[r1],%[r3],0x304\n"
31 : [r1] "+&d" (r1.pair)
32 : [r3] "d" (cmd)
33 : "memory");
34 return r1.odd;
35}
36
37static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
38{
39 diag_stat_inc(DIAG_STAT_X304);
40 return __hypfs_sprp_diag304(data, cmd);
41}
42
43static void hypfs_sprp_free(const void *data)
44{
45 free_page((unsigned long) data);
46}
47
48static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
49{
50 unsigned long rc;
51 void *data;
52
53 data = (void *) get_zeroed_page(GFP_KERNEL);
54 if (!data)
55 return -ENOMEM;
56 rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
57 if (rc != 1) {
58 *data_ptr = *free_ptr = NULL;
59 *size = 0;
60 free_page((unsigned long) data);
61 return -EIO;
62 }
63 *data_ptr = *free_ptr = data;
64 *size = PAGE_SIZE;
65 return 0;
66}
67
68static int __hypfs_sprp_ioctl(void __user *user_area)
69{
70 struct hypfs_diag304 *diag304;
71 unsigned long cmd;
72 void __user *udata;
73 void *data;
74 int rc;
75
76 rc = -ENOMEM;
77 data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
78 diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL);
79 if (!data || !diag304)
80 goto out;
81
82 rc = -EFAULT;
83 if (copy_from_user(diag304, user_area, sizeof(*diag304)))
84 goto out;
85 rc = -EINVAL;
86 if ((diag304->args[0] >> 8) != 0 || diag304->args[1] > DIAG304_CMD_MAX)
87 goto out;
88
89 rc = -EFAULT;
90 udata = (void __user *)(unsigned long) diag304->data;
91 if (diag304->args[1] == DIAG304_SET_WEIGHTS ||
92 diag304->args[1] == DIAG304_SET_CAPPING)
93 if (copy_from_user(data, udata, PAGE_SIZE))
94 goto out;
95
96 cmd = *(unsigned long *) &diag304->args[0];
97 diag304->rc = hypfs_sprp_diag304(data, cmd);
98
99 if (diag304->args[1] == DIAG304_QUERY_PRP)
100 if (copy_to_user(udata, data, PAGE_SIZE)) {
101 rc = -EFAULT;
102 goto out;
103 }
104
105 rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0;
106out:
107 kfree(diag304);
108 free_page((unsigned long) data);
109 return rc;
110}
111
112static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
113 unsigned long arg)
114{
115 void __user *argp;
116
117 if (!capable(CAP_SYS_ADMIN))
118 return -EACCES;
119 if (is_compat_task())
120 argp = compat_ptr(arg);
121 else
122 argp = (void __user *) arg;
123 switch (cmd) {
124 case HYPFS_DIAG304:
125 return __hypfs_sprp_ioctl(argp);
126 default: /* unknown ioctl number */
127 return -ENOTTY;
128 }
129 return 0;
130}
131
132static struct hypfs_dbfs_file hypfs_sprp_file = {
133 .name = "diag_304",
134 .data_create = hypfs_sprp_create,
135 .data_free = hypfs_sprp_free,
136 .unlocked_ioctl = hypfs_sprp_ioctl,
137};
138
139void hypfs_sprp_init(void)
140{
141 if (!sclp.has_sprp)
142 return;
143 hypfs_dbfs_create_file(&hypfs_sprp_file);
144}
145
146void hypfs_sprp_exit(void)
147{
148 if (!sclp.has_sprp)
149 return;
150 hypfs_dbfs_remove_file(&hypfs_sprp_file);
151}
1/*
2 * Hypervisor filesystem for Linux on s390.
3 * Set Partition-Resource Parameter interface.
4 *
5 * Copyright IBM Corp. 2013
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 */
8
9#include <linux/compat.h>
10#include <linux/errno.h>
11#include <linux/gfp.h>
12#include <linux/string.h>
13#include <linux/types.h>
14#include <linux/uaccess.h>
15#include <asm/compat.h>
16#include <asm/sclp.h>
17#include "hypfs.h"
18
19#define DIAG304_SET_WEIGHTS 0
20#define DIAG304_QUERY_PRP 1
21#define DIAG304_SET_CAPPING 2
22
23#define DIAG304_CMD_MAX 2
24
25static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
26{
27 register unsigned long _data asm("2") = (unsigned long) data;
28 register unsigned long _rc asm("3");
29 register unsigned long _cmd asm("4") = cmd;
30
31 asm volatile("diag %1,%2,0x304\n"
32 : "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory");
33
34 return _rc;
35}
36
37static void hypfs_sprp_free(const void *data)
38{
39 free_page((unsigned long) data);
40}
41
42static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
43{
44 unsigned long rc;
45 void *data;
46
47 data = (void *) get_zeroed_page(GFP_KERNEL);
48 if (!data)
49 return -ENOMEM;
50 rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
51 if (rc != 1) {
52 *data_ptr = *free_ptr = NULL;
53 *size = 0;
54 free_page((unsigned long) data);
55 return -EIO;
56 }
57 *data_ptr = *free_ptr = data;
58 *size = PAGE_SIZE;
59 return 0;
60}
61
62static int __hypfs_sprp_ioctl(void __user *user_area)
63{
64 struct hypfs_diag304 diag304;
65 unsigned long cmd;
66 void __user *udata;
67 void *data;
68 int rc;
69
70 if (copy_from_user(&diag304, user_area, sizeof(diag304)))
71 return -EFAULT;
72 if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX)
73 return -EINVAL;
74
75 data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
76 if (!data)
77 return -ENOMEM;
78
79 udata = (void __user *)(unsigned long) diag304.data;
80 if (diag304.args[1] == DIAG304_SET_WEIGHTS ||
81 diag304.args[1] == DIAG304_SET_CAPPING)
82 if (copy_from_user(data, udata, PAGE_SIZE)) {
83 rc = -EFAULT;
84 goto out;
85 }
86
87 cmd = *(unsigned long *) &diag304.args[0];
88 diag304.rc = hypfs_sprp_diag304(data, cmd);
89
90 if (diag304.args[1] == DIAG304_QUERY_PRP)
91 if (copy_to_user(udata, data, PAGE_SIZE)) {
92 rc = -EFAULT;
93 goto out;
94 }
95
96 rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0;
97out:
98 free_page((unsigned long) data);
99 return rc;
100}
101
102static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
103 unsigned long arg)
104{
105 void __user *argp;
106
107 if (!capable(CAP_SYS_ADMIN))
108 return -EACCES;
109 if (is_compat_task())
110 argp = compat_ptr(arg);
111 else
112 argp = (void __user *) arg;
113 switch (cmd) {
114 case HYPFS_DIAG304:
115 return __hypfs_sprp_ioctl(argp);
116 default: /* unknown ioctl number */
117 return -ENOTTY;
118 }
119 return 0;
120}
121
122static struct hypfs_dbfs_file hypfs_sprp_file = {
123 .name = "diag_304",
124 .data_create = hypfs_sprp_create,
125 .data_free = hypfs_sprp_free,
126 .unlocked_ioctl = hypfs_sprp_ioctl,
127};
128
129int hypfs_sprp_init(void)
130{
131 if (!sclp_has_sprp())
132 return 0;
133 return hypfs_dbfs_create_file(&hypfs_sprp_file);
134}
135
136void hypfs_sprp_exit(void)
137{
138 if (!sclp_has_sprp())
139 return;
140 hypfs_dbfs_remove_file(&hypfs_sprp_file);
141}