Commit | Line | Data |
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07be0382 MS |
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> | |
1ec2772e | 16 | #include <asm/diag.h> |
07be0382 MS |
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 | ||
1ec2772e | 26 | static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd) |
07be0382 MS |
27 | { |
28 | register unsigned long _data asm("2") = (unsigned long) data; | |
29 | register unsigned long _rc asm("3"); | |
30 | register unsigned long _cmd asm("4") = cmd; | |
31 | ||
32 | asm volatile("diag %1,%2,0x304\n" | |
33 | : "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory"); | |
34 | ||
35 | return _rc; | |
36 | } | |
37 | ||
1ec2772e MS |
38 | static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd) |
39 | { | |
40 | diag_stat_inc(DIAG_STAT_X304); | |
41 | return __hypfs_sprp_diag304(data, cmd); | |
42 | } | |
43 | ||
07be0382 MS |
44 | static void hypfs_sprp_free(const void *data) |
45 | { | |
46 | free_page((unsigned long) data); | |
47 | } | |
48 | ||
49 | static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size) | |
50 | { | |
51 | unsigned long rc; | |
52 | void *data; | |
53 | ||
54 | data = (void *) get_zeroed_page(GFP_KERNEL); | |
55 | if (!data) | |
56 | return -ENOMEM; | |
57 | rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP); | |
58 | if (rc != 1) { | |
59 | *data_ptr = *free_ptr = NULL; | |
60 | *size = 0; | |
61 | free_page((unsigned long) data); | |
62 | return -EIO; | |
63 | } | |
64 | *data_ptr = *free_ptr = data; | |
65 | *size = PAGE_SIZE; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int __hypfs_sprp_ioctl(void __user *user_area) | |
70 | { | |
71 | struct hypfs_diag304 diag304; | |
72 | unsigned long cmd; | |
73 | void __user *udata; | |
74 | void *data; | |
75 | int rc; | |
76 | ||
77 | if (copy_from_user(&diag304, user_area, sizeof(diag304))) | |
78 | return -EFAULT; | |
79 | if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX) | |
80 | return -EINVAL; | |
81 | ||
82 | data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
83 | if (!data) | |
84 | return -ENOMEM; | |
85 | ||
86 | udata = (void __user *)(unsigned long) diag304.data; | |
87 | if (diag304.args[1] == DIAG304_SET_WEIGHTS || | |
88 | diag304.args[1] == DIAG304_SET_CAPPING) | |
89 | if (copy_from_user(data, udata, PAGE_SIZE)) { | |
90 | rc = -EFAULT; | |
91 | goto out; | |
92 | } | |
93 | ||
94 | cmd = *(unsigned long *) &diag304.args[0]; | |
95 | diag304.rc = hypfs_sprp_diag304(data, cmd); | |
96 | ||
97 | if (diag304.args[1] == DIAG304_QUERY_PRP) | |
98 | if (copy_to_user(udata, data, PAGE_SIZE)) { | |
99 | rc = -EFAULT; | |
100 | goto out; | |
101 | } | |
102 | ||
103 | rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0; | |
104 | out: | |
105 | free_page((unsigned long) data); | |
106 | return rc; | |
107 | } | |
108 | ||
109 | static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd, | |
110 | unsigned long arg) | |
111 | { | |
112 | void __user *argp; | |
113 | ||
114 | if (!capable(CAP_SYS_ADMIN)) | |
115 | return -EACCES; | |
116 | if (is_compat_task()) | |
117 | argp = compat_ptr(arg); | |
118 | else | |
119 | argp = (void __user *) arg; | |
120 | switch (cmd) { | |
121 | case HYPFS_DIAG304: | |
122 | return __hypfs_sprp_ioctl(argp); | |
123 | default: /* unknown ioctl number */ | |
124 | return -ENOTTY; | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static struct hypfs_dbfs_file hypfs_sprp_file = { | |
130 | .name = "diag_304", | |
131 | .data_create = hypfs_sprp_create, | |
132 | .data_free = hypfs_sprp_free, | |
133 | .unlocked_ioctl = hypfs_sprp_ioctl, | |
134 | }; | |
135 | ||
136 | int hypfs_sprp_init(void) | |
137 | { | |
37c5f6c8 | 138 | if (!sclp.has_sprp) |
07be0382 MS |
139 | return 0; |
140 | return hypfs_dbfs_create_file(&hypfs_sprp_file); | |
141 | } | |
142 | ||
143 | void hypfs_sprp_exit(void) | |
144 | { | |
37c5f6c8 | 145 | if (!sclp.has_sprp) |
07be0382 MS |
146 | return; |
147 | hypfs_dbfs_remove_file(&hypfs_sprp_file); | |
148 | } |