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lscpu: add helper to get physical sockets 

Add a helper function, get_number_of_physical_sockets_from_dmi(),
to get physical sockets from DMI table in case of the sysfs for
cpu topology doesn't have the physical socket information.

get_number_of_physical_sockets_from_dmi() parse the DMI table
and counts the number of SMBIOS Processor Information (Type04)
structure.

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
This commit is contained in:
Masayoshi Mizuma 2020-11-20 00:06:08 -05:00 committed by Karel Zak
parent 3cd676f5ec
commit 788f90d69a
2 changed files with 31 additions and 0 deletions
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29
sys-utils/lscpu-dmi.c
View File

@ -66,6 +66,9 @@ int parse_dmi_table(uint16_t len, uint16_t num,
di->manufacturer = dmi_string(&h, data[0x04]);
di->product = dmi_string(&h, data[0x05]);
break;
case 4:
di->sockets++;
break;
default:
break;
}
@ -77,3 +80,29 @@ int parse_dmi_table(uint16_t len, uint16_t num,
done:
return rc;
}
size_t get_number_of_physical_sockets_from_dmi(void)
{
static char const sys_fw_dmi_tables[] = _PATH_SYS_DMI;
struct dmi_info di;
struct stat st;
uint8_t *data;
int rc = 0;
if (stat(sys_fw_dmi_tables, &st))
return rc;
data = get_mem_chunk(0, st.st_size, sys_fw_dmi_tables);
if (!data)
return rc;
memset(&di, 0, sizeof(struct dmi_info));
rc = parse_dmi_table(st.st_size, st.st_size/4, data, &di);
free(data);
if ((rc < 0) || !di.sockets)
return 0;
else
return di.sockets;
}

2
sys-utils/lscpu.h
View File

@ -311,10 +311,12 @@ struct dmi_info {
char *vendor;
char *product;
char *manufacturer;
int sockets;
};
void to_dmi_header(struct lscpu_dmi_header *h, uint8_t *data);
char *dmi_string(const struct lscpu_dmi_header *dm, uint8_t s);
int parse_dmi_table(uint16_t len, uint16_t num, uint8_t *data, struct dmi_info *di);
size_t get_number_of_physical_sockets_from_dmi(void);
#endif /* LSCPU_H */