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
173
174
175
176
177
178
179
180
181
182
183
184
185
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2025, Intel Corporation.
*
* Memory Range and Region Mapping (MRRM) structure
*
* Parse and report the platform's MRRM table in /sys.
*/
#define pr_fmt(fmt) "acpi/mrrm: " fmt
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/sysfs.h>
/* Default assume one memory region covering all system memory, per the spec */
static int max_mem_region = 1;
/* Access for use by resctrl file system */
int acpi_mrrm_max_mem_region(void)
{
return max_mem_region;
}
struct mrrm_mem_range_entry {
u64 base;
u64 length;
int node;
u8 local_region_id;
u8 remote_region_id;
};
static struct mrrm_mem_range_entry *mrrm_mem_range_entry;
static u32 mrrm_mem_entry_num;
static int get_node_num(struct mrrm_mem_range_entry *e)
{
unsigned int nid;
for_each_online_node(nid) {
for (int z = 0; z < MAX_NR_ZONES; z++) {
struct zone *zone = NODE_DATA(nid)->node_zones + z;
if (!populated_zone(zone))
continue;
if (zone_intersects(zone, PHYS_PFN(e->base), PHYS_PFN(e->length)))
return zone_to_nid(zone);
}
}
return -ENOENT;
}
static __init int acpi_parse_mrrm(struct acpi_table_header *table)
{
struct acpi_mrrm_mem_range_entry *mre_entry;
struct acpi_table_mrrm *mrrm;
void *mre, *mrrm_end;
int mre_count = 0;
mrrm = (struct acpi_table_mrrm *)table;
if (!mrrm)
return -ENODEV;
if (mrrm->flags & ACPI_MRRM_FLAGS_REGION_ASSIGNMENT_OS)
return -EOPNOTSUPP;
mrrm_end = (void *)mrrm + mrrm->header.length - 1;
mre = (void *)mrrm + sizeof(struct acpi_table_mrrm);
while (mre < mrrm_end) {
mre_entry = mre;
mre_count++;
mre += mre_entry->header.length;
}
if (!mre_count) {
pr_info(FW_BUG "No ranges listed in MRRM table\n");
return -EINVAL;
}
mrrm_mem_range_entry = kmalloc_array(mre_count, sizeof(*mrrm_mem_range_entry),
GFP_KERNEL | __GFP_ZERO);
if (!mrrm_mem_range_entry)
return -ENOMEM;
mre = (void *)mrrm + sizeof(struct acpi_table_mrrm);
while (mre < mrrm_end) {
struct mrrm_mem_range_entry *e;
mre_entry = mre;
e = mrrm_mem_range_entry + mrrm_mem_entry_num;
e->base = mre_entry->addr_base;
e->length = mre_entry->addr_len;
e->node = get_node_num(e);
if (mre_entry->region_id_flags & ACPI_MRRM_VALID_REGION_ID_FLAGS_LOCAL)
e->local_region_id = mre_entry->local_region_id;
else
e->local_region_id = -1;
if (mre_entry->region_id_flags & ACPI_MRRM_VALID_REGION_ID_FLAGS_REMOTE)
e->remote_region_id = mre_entry->remote_region_id;
else
e->remote_region_id = -1;
mrrm_mem_entry_num++;
mre += mre_entry->header.length;
}
max_mem_region = mrrm->max_mem_region;
return 0;
}
#define RANGE_ATTR(name, fmt) \
static ssize_t name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
struct mrrm_mem_range_entry *mre; \
const char *kname = kobject_name(kobj); \
int n, ret; \
\
ret = kstrtoint(kname + 5, 10, &n); \
if (ret) \
return ret; \
\
mre = mrrm_mem_range_entry + n; \
\
return sysfs_emit(buf, fmt, mre->name); \
} \
static struct kobj_attribute name##_attr = __ATTR_RO(name)
RANGE_ATTR(base, "0x%llx\n");
RANGE_ATTR(length, "0x%llx\n");
RANGE_ATTR(node, "%d\n");
RANGE_ATTR(local_region_id, "%d\n");
RANGE_ATTR(remote_region_id, "%d\n");
static struct attribute *memory_range_attrs[] = {
&base_attr.attr,
&length_attr.attr,
&node_attr.attr,
&local_region_id_attr.attr,
&remote_region_id_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(memory_range);
static __init int add_boot_memory_ranges(void)
{
struct kobject *pkobj, *kobj;
int ret = -EINVAL;
char *name;
pkobj = kobject_create_and_add("memory_ranges", acpi_kobj);
for (int i = 0; i < mrrm_mem_entry_num; i++) {
name = kasprintf(GFP_KERNEL, "range%d", i);
if (!name) {
ret = -ENOMEM;
break;
}
kobj = kobject_create_and_add(name, pkobj);
ret = sysfs_create_groups(kobj, memory_range_groups);
if (ret)
return ret;
}
return ret;
}
static __init int mrrm_init(void)
{
int ret;
ret = acpi_table_parse(ACPI_SIG_MRRM, acpi_parse_mrrm);
if (ret < 0)
return ret;
return add_boot_memory_ranges();
}
device_initcall(mrrm_init);
|
