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
|
/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <soc/qcom/rpm-smd.h>
#define RPM_MISC_REQ_TYPE 0x6373696d
#define RPM_MISC_REQ_DDR_HEALTH 0x31726464
static uint32_t mem_size;
static int ddr_health_set(const char *val, struct kernel_param *kp);
module_param_call(mem_size, ddr_health_set, param_get_uint,
&mem_size, 0644);
struct ddr_health {
uint64_t addr;
uint32_t size;
uint32_t reserved;
};
static struct mutex lock;
static struct ddr_health *ddr_health;
static struct msm_rpm_kvp rpm_kvp;
static int ddr_health_set(const char *val, struct kernel_param *kp)
{
int ret;
void *virt;
uint64_t old_addr = 0;
uint32_t old_size = 0;
mutex_lock(&lock);
ret = param_set_uint(val, kp);
if (ret) {
pr_err("ddr-health: error setting value %d\n", ret);
mutex_unlock(&lock);
return ret;
}
if (rpm_kvp.data) {
ddr_health = (struct ddr_health *)rpm_kvp.data;
old_addr = ddr_health->addr;
old_size = ddr_health->size;
}
rpm_kvp.key = RPM_MISC_REQ_DDR_HEALTH;
if (mem_size) {
virt = kzalloc(mem_size, GFP_KERNEL);
if (!virt) {
pr_err("ddr-health: failed to alloc mem request %x\n",
mem_size);
mutex_unlock(&lock);
return -ENOMEM;
}
ddr_health->addr = (uint64_t)virt_to_phys(virt);
ddr_health->size = mem_size;
rpm_kvp.length = sizeof(struct ddr_health);
rpm_kvp.data = (void *)ddr_health;
ret = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET,
RPM_MISC_REQ_TYPE, 0, &rpm_kvp, 1);
if (ret) {
pr_err("ddr-health: send buf to RPM failed %d, %x\n",
ret, mem_size);
kfree(virt);
goto err;
}
} else {
ddr_health->addr = 0;
ddr_health->size = 0;
rpm_kvp.length = sizeof(struct ddr_health);
rpm_kvp.data = (void *)ddr_health;
ret = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET,
RPM_MISC_REQ_TYPE, 0, &rpm_kvp, 1);
if (ret) {
pr_err("ddr-health: send nobuf to RPM failed %d, %x\n",
ret, mem_size);
goto err;
}
}
if (old_addr)
kfree(phys_to_virt((phys_addr_t)old_addr));
mutex_unlock(&lock);
return 0;
err:
ddr_health->addr = old_addr;
ddr_health->size = old_size;
mutex_unlock(&lock);
return ret;
}
static int __init ddr_health_init(void)
{
mutex_init(&lock);
ddr_health = kzalloc(sizeof(*ddr_health), GFP_KERNEL);
if (!ddr_health) {
pr_err("ddr-health: failed to alloc mem\n");
return -ENOMEM;
}
return 0;
}
module_init(ddr_health_init);
static void __exit ddr_health_exit(void)
{
if (rpm_kvp.data) {
ddr_health = (struct ddr_health *)rpm_kvp.data;
if (ddr_health->addr)
kfree(phys_to_virt((phys_addr_t)ddr_health->addr));
}
kfree(ddr_health);
mutex_destroy(&lock);
}
module_exit(ddr_health_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DDR health monitor driver");
|
