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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Xilinx TMR Inject IP.
*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*
* Description:
* This driver is developed for TMR Inject IP,The Triple Modular Redundancy(TMR)
* Inject provides fault injection.
*/
#include <asm/xilinx_mb_manager.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/debugfs.h>
#include <linux/platform_device.h>
#include <linux/fault-inject.h>
/* TMR Inject Register offsets */
#define XTMR_INJECT_CR_OFFSET 0x0
#define XTMR_INJECT_AIR_OFFSET 0x4
#define XTMR_INJECT_IIR_OFFSET 0xC
#define XTMR_INJECT_EAIR_OFFSET 0x10
#define XTMR_INJECT_ERR_OFFSET 0x204
/* Register Bitmasks/shifts */
#define XTMR_INJECT_CR_CPUID_SHIFT 8
#define XTMR_INJECT_CR_IE_SHIFT 10
#define XTMR_INJECT_IIR_ADDR_MASK GENMASK(31, 16)
#define XTMR_INJECT_MAGIC_MAX_VAL 255
/**
* struct xtmr_inject_dev - Driver data for TMR Inject
* @regs: device physical base address
* @magic: Magic hardware configuration value
*/
struct xtmr_inject_dev {
void __iomem *regs;
u32 magic;
};
static DECLARE_FAULT_ATTR(inject_fault);
static char *inject_request;
module_param(inject_request, charp, 0);
MODULE_PARM_DESC(inject_request, "default fault injection attributes");
static struct dentry *dbgfs_root;
/* IO accessors */
static inline void xtmr_inject_write(struct xtmr_inject_dev *xtmr_inject,
u32 addr, u32 value)
{
iowrite32(value, xtmr_inject->regs + addr);
}
static inline u32 xtmr_inject_read(struct xtmr_inject_dev *xtmr_inject,
u32 addr)
{
return ioread32(xtmr_inject->regs + addr);
}
static int xtmr_inject_set(void *data, u64 val)
{
if (val != 1)
return -EINVAL;
xmb_inject_err();
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(xtmr_inject_fops, NULL, xtmr_inject_set, "%llu\n");
static void xtmr_init_debugfs(struct xtmr_inject_dev *xtmr_inject)
{
struct dentry *dir;
dbgfs_root = debugfs_create_dir("xtmr_inject", NULL);
dir = fault_create_debugfs_attr("inject_fault", dbgfs_root,
&inject_fault);
debugfs_create_file("inject_fault", 0200, dir, NULL,
&xtmr_inject_fops);
}
static void xtmr_inject_init(struct xtmr_inject_dev *xtmr_inject)
{
u32 cr_val;
if (inject_request)
setup_fault_attr(&inject_fault, inject_request);
/* Allow fault injection */
cr_val = xtmr_inject->magic |
(1 << XTMR_INJECT_CR_IE_SHIFT) |
(1 << XTMR_INJECT_CR_CPUID_SHIFT);
xtmr_inject_write(xtmr_inject, XTMR_INJECT_CR_OFFSET,
cr_val);
/* Initialize the address inject and instruction inject registers */
xtmr_inject_write(xtmr_inject, XTMR_INJECT_AIR_OFFSET,
XMB_INJECT_ERR_OFFSET);
xtmr_inject_write(xtmr_inject, XTMR_INJECT_IIR_OFFSET,
XMB_INJECT_ERR_OFFSET & XTMR_INJECT_IIR_ADDR_MASK);
}
/**
* xtmr_inject_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*
* This is the driver probe routine. It does all the memory
* allocation for the device.
*
* Return: 0 on success and failure value on error
*/
static int xtmr_inject_probe(struct platform_device *pdev)
{
struct xtmr_inject_dev *xtmr_inject;
int err;
xtmr_inject = devm_kzalloc(&pdev->dev, sizeof(*xtmr_inject),
GFP_KERNEL);
if (!xtmr_inject)
return -ENOMEM;
xtmr_inject->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xtmr_inject->regs))
return PTR_ERR(xtmr_inject->regs);
err = of_property_read_u32(pdev->dev.of_node, "xlnx,magic",
&xtmr_inject->magic);
if (err < 0) {
dev_err(&pdev->dev, "unable to read xlnx,magic property");
return err;
}
if (xtmr_inject->magic > XTMR_INJECT_MAGIC_MAX_VAL) {
dev_err(&pdev->dev, "invalid xlnx,magic property value");
return -EINVAL;
}
/* Initialize TMR Inject */
xtmr_inject_init(xtmr_inject);
xtmr_init_debugfs(xtmr_inject);
platform_set_drvdata(pdev, xtmr_inject);
return 0;
}
static void xtmr_inject_remove(struct platform_device *pdev)
{
debugfs_remove_recursive(dbgfs_root);
dbgfs_root = NULL;
}
static const struct of_device_id xtmr_inject_of_match[] = {
{
.compatible = "xlnx,tmr-inject-1.0",
},
{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, xtmr_inject_of_match);
static struct platform_driver xtmr_inject_driver = {
.driver = {
.name = "xilinx-tmr_inject",
.of_match_table = xtmr_inject_of_match,
},
.probe = xtmr_inject_probe,
.remove = xtmr_inject_remove,
};
module_platform_driver(xtmr_inject_driver);
MODULE_AUTHOR("Advanced Micro Devices, Inc");
MODULE_DESCRIPTION("Xilinx TMR Inject Driver");
MODULE_LICENSE("GPL");
|
