1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
// SPDX-License-Identifier: GPL-2.0
/*
* Hypervisor filesystem for Linux on s390
*
* Diag 0C implementation
*
* Copyright IBM Corp. 2014
*/
#include <linux/slab.h>
#include <linux/cpu.h>
#include <asm/diag.h>
#include <asm/hypfs.h>
#include "hypfs.h"
#define DBFS_D0C_HDR_VERSION 0
/*
* Execute diagnose 0c in 31 bit mode
*/
static void diag0c(struct hypfs_diag0c_entry *entry)
{
diag_stat_inc(DIAG_STAT_X00C);
asm volatile (
" sam31\n"
" diag %0,%0,0x0c\n"
" sam64\n"
: /* no output register */
: "a" (entry)
: "memory");
}
/*
* Get hypfs_diag0c_entry from CPU vector and store diag0c data
*/
static void diag0c_fn(void *data)
{
diag0c(((void **) data)[smp_processor_id()]);
}
/*
* Allocate buffer and store diag 0c data
*/
static void *diag0c_store(unsigned int *count)
{
struct hypfs_diag0c_data *diag0c_data;
unsigned int cpu_count, cpu, i;
void **cpu_vec;
get_online_cpus();
cpu_count = num_online_cpus();
cpu_vec = kmalloc_array(num_possible_cpus(), sizeof(*cpu_vec),
GFP_KERNEL);
if (!cpu_vec)
goto fail_put_online_cpus;
/* Note: Diag 0c needs 8 byte alignment and real storage */
diag0c_data = kzalloc(struct_size(diag0c_data, entry, cpu_count),
GFP_KERNEL | GFP_DMA);
if (!diag0c_data)
goto fail_kfree_cpu_vec;
i = 0;
/* Fill CPU vector for each online CPU */
for_each_online_cpu(cpu) {
diag0c_data->entry[i].cpu = cpu;
cpu_vec[cpu] = &diag0c_data->entry[i++];
}
/* Collect data all CPUs */
on_each_cpu(diag0c_fn, cpu_vec, 1);
*count = cpu_count;
kfree(cpu_vec);
put_online_cpus();
return diag0c_data;
fail_kfree_cpu_vec:
kfree(cpu_vec);
fail_put_online_cpus:
put_online_cpus();
return ERR_PTR(-ENOMEM);
}
/*
* Hypfs DBFS callback: Free diag 0c data
*/
static void dbfs_diag0c_free(const void *data)
{
kfree(data);
}
/*
* Hypfs DBFS callback: Create diag 0c data
*/
static int dbfs_diag0c_create(void **data, void **data_free_ptr, size_t *size)
{
struct hypfs_diag0c_data *diag0c_data;
unsigned int count;
diag0c_data = diag0c_store(&count);
if (IS_ERR(diag0c_data))
return PTR_ERR(diag0c_data);
memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
get_tod_clock_ext(diag0c_data->hdr.tod_ext);
diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
diag0c_data->hdr.count = count;
*data = diag0c_data;
*data_free_ptr = diag0c_data;
*size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
return 0;
}
/*
* Hypfs DBFS file structure
*/
static struct hypfs_dbfs_file dbfs_file_0c = {
.name = "diag_0c",
.data_create = dbfs_diag0c_create,
.data_free = dbfs_diag0c_free,
};
/*
* Initialize diag 0c interface for z/VM
*/
int __init hypfs_diag0c_init(void)
{
if (!MACHINE_IS_VM)
return 0;
hypfs_dbfs_create_file(&dbfs_file_0c);
return 0;
}
/*
* Shutdown diag 0c interface for z/VM
*/
void hypfs_diag0c_exit(void)
{
if (!MACHINE_IS_VM)
return;
hypfs_dbfs_remove_file(&dbfs_file_0c);
}
|
