blob: f5f7e78ddc0c8deee7795818c2633c227f4f427c [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Martin Schwidefsky07be0382014-01-24 09:18:52 +01002/*
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>
Martin Schwidefsky1ec27722015-08-20 17:28:44 +020016#include <asm/diag.h>
Martin Schwidefsky07be0382014-01-24 09:18:52 +010017#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
Martin Schwidefsky1ec27722015-08-20 17:28:44 +020026static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
Martin Schwidefsky07be0382014-01-24 09:18:52 +010027{
Heiko Carstenscf1ffce2021-06-17 10:26:57 +020028 union register_pair r1 = { .even = (unsigned long)data, };
Martin Schwidefsky07be0382014-01-24 09:18:52 +010029
Heiko Carstenscf1ffce2021-06-17 10:26:57 +020030 asm volatile("diag %[r1],%[r3],0x304\n"
31 : [r1] "+&d" (r1.pair)
32 : [r3] "d" (cmd)
33 : "memory");
34 return r1.odd;
Martin Schwidefsky07be0382014-01-24 09:18:52 +010035}
36
Martin Schwidefsky1ec27722015-08-20 17:28:44 +020037static 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
Martin Schwidefsky07be0382014-01-24 09:18:52 +010043static 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{
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +020070 struct hypfs_diag304 *diag304;
Martin Schwidefsky07be0382014-01-24 09:18:52 +010071 unsigned long cmd;
72 void __user *udata;
73 void *data;
74 int rc;
75
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +020076 rc = -ENOMEM;
Martin Schwidefsky07be0382014-01-24 09:18:52 +010077 data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +020078 diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL);
79 if (!data || !diag304)
80 goto out;
Martin Schwidefsky07be0382014-01-24 09:18:52 +010081
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +020082 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))
Martin Schwidefsky07be0382014-01-24 09:18:52 +010094 goto out;
Martin Schwidefsky07be0382014-01-24 09:18:52 +010095
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +020096 cmd = *(unsigned long *) &diag304->args[0];
97 diag304->rc = hypfs_sprp_diag304(data, cmd);
Martin Schwidefsky07be0382014-01-24 09:18:52 +010098
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +020099 if (diag304->args[1] == DIAG304_QUERY_PRP)
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100100 if (copy_to_user(udata, data, PAGE_SIZE)) {
101 rc = -EFAULT;
102 goto out;
103 }
104
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +0200105 rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0;
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100106out:
Martin Schwidefsky8ef9eda2018-09-06 10:06:57 +0200107 kfree(diag304);
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100108 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
Greg Kroah-Hartmanf36108c2019-01-22 16:21:00 +0100139void hypfs_sprp_init(void)
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100140{
David Hildenbrand37c5f6c2015-05-06 13:18:59 +0200141 if (!sclp.has_sprp)
Greg Kroah-Hartmanf36108c2019-01-22 16:21:00 +0100142 return;
143 hypfs_dbfs_create_file(&hypfs_sprp_file);
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100144}
145
146void hypfs_sprp_exit(void)
147{
David Hildenbrand37c5f6c2015-05-06 13:18:59 +0200148 if (!sclp.has_sprp)
Martin Schwidefsky07be0382014-01-24 09:18:52 +0100149 return;
150 hypfs_dbfs_remove_file(&hypfs_sprp_file);
151}