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// 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->header.revision != 1)
return -EINVAL;
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, **kobjs;
int ret = -EINVAL;
char name[16];
int i;
pkobj = kobject_create_and_add("memory_ranges", acpi_kobj);
if (!pkobj)
return -ENOMEM;
kobjs = kcalloc(mrrm_mem_entry_num, sizeof(*kobjs), GFP_KERNEL);
if (!kobjs) {
kobject_put(pkobj);
return -ENOMEM;
}
for (i = 0; i < mrrm_mem_entry_num; i++) {
scnprintf(name, sizeof(name), "range%d", i);
kobj = kobject_create_and_add(name, pkobj);
if (!kobj) {
ret = -ENOMEM;
goto cleanup;
}
ret = sysfs_create_groups(kobj, memory_range_groups);
if (ret) {
kobject_put(kobj);
goto cleanup;
}
kobjs[i] = kobj;
}
kfree(kobjs);
return 0;
cleanup:
for (int j = 0; j < i; j++) {
if (kobjs[j]) {
sysfs_remove_groups(kobjs[j], memory_range_groups);
kobject_put(kobjs[j]);
}
}
kfree(kobjs);
kobject_put(pkobj);
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);
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